Revert back to Alpine 3.12 for 32 bit systems

2021-01-30 23:15:54 +00:00
708 changed files with 17621 additions and 145671 deletions
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -1,2 +1 @@
 FROM qmcgaw/godevcontainer
-RUN apk add wireguard-tools
--- a/.devcontainer/README.md
+++ b/.devcontainer/README.md
@@ -19,7 +19,6 @@ It works on Linux, Windows and OSX.

 1. Open the command palette in Visual Studio Code (CTRL+SHIFT+P).
 1. Select `Remote-Containers: Open Folder in Container...` and choose the project directory.
-1. For Docker running on Windows HyperV, if you want to use SSH keys, bind mount them at `/tmp/.ssh` by changing the `volumes` section in the [docker-compose.yml](docker-compose.yml).

 ## Customization

--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -8,7 +8,7 @@
        "vscode"
    ],
    "shutdownAction": "stopCompose",
-    "postCreateCommand": "~/.windows.sh && go mod download && go mod tidy",
+    "postCreateCommand": "go mod download",
    "workspaceFolder": "/workspace",
    "extensions": [
        "golang.go",
--- a/.devcontainer/docker-compose.yml
+++ b/.devcontainer/docker-compose.yml
@@ -4,29 +4,21 @@ services:
  vscode:
    build: .
    image: godevcontainer
-    devices:
-      - /dev/net/tun:/dev/net/tun
    volumes:
      - ../:/workspace
      # Docker socket to access Docker server
      - /var/run/docker.sock:/var/run/docker.sock
-      # Docker configuration
-      - ~/.docker:/root/.docker:z
-      # SSH directory for Linux, OSX and WSL
-      - ~/.ssh:/root/.ssh:z
-      # For Windows without WSL, a copy will be made
-      # from /tmp/.ssh to ~/.ssh to fix permissions
-      #- ~/.ssh:/tmp/.ssh:ro
-      # Shell history persistence
-      - ~/.zsh_history:/root/.zsh_history:z
+      # SSH directory
+      - ~/.ssh:/home/vscode/.ssh
+      - ~/.ssh:/root/.ssh
      # Git config
-      - ~/.gitconfig:/root/.gitconfig:z
+      - ~/.gitconfig:/home/districter/.gitconfig
+      - ~/.gitconfig:/root/.gitconfig
    environment:
      - TZ=
    cap_add:
      # For debugging with dlv
-      # - SYS_PTRACE
-      - NET_ADMIN
+      - SYS_PTRACE
    security_opt:
      # For debugging with dlv
      - seccomp:unconfined
--- a/.github/ISSUE_TEMPLATE/bug.md
+++ b/.github/ISSUE_TEMPLATE/bug.md
@@ -0,0 +1,37 @@
+---
+name: Bug
+about: Report a bug
+title: 'Bug: FILL THIS TEXT!'
+labels: ":bug: bug"
+assignees: qdm12
+
+---
+
+**Host OS** (approximate answer is fine too): Ubuntu 18
+
+**Is this urgent?**: No
+
+**What VPN provider are you using**:
+
+**What are you using to run your container?**: Docker Compose
+
+**What is the version of the program** (See the line at the top of your logs)
+
+```
+Running version latest built on 2020-03-13T01:30:06Z (commit d0f678c)
+```
+
+**What's the problem** 🤔
+
+That feature doesn't work
+
+**Share your logs...**
+
+...*careful to remove i.e. token information with PIA port forwarding*
+
+```log
+
+PASTE YOUR LOGS
+IN THERE
+
+```
--- a/.github/ISSUE_TEMPLATE/bug.yml
+++ b/.github/ISSUE_TEMPLATE/bug.yml
@@ -1,107 +0,0 @@
-name: Bug
-description: Report a bug
-title: "Bug: "
-labels: [":bug: bug"]
-body:
-  - type: markdown
-    attributes:
-      value: |
-        Thanks for taking the time to fill out this bug report!
-  - type: dropdown
-    id: urgent
-    attributes:
-      label: Is this urgent?
-      description: |
-        Is this a critical bug, or do you need this fixed urgently?
-        If this is urgent, note you can use one of the [image tags available](https://github.com/qdm12/gluetun/wiki/Docker-image-tags) if that can help.
-      options:
-        - "No"
-        - "Yes"
-  - type: input
-    id: host-os
-    attributes:
-      label: Host OS
-      description: What is your host OS?
-      placeholder: "Debian Buster"
-  - type: dropdown
-    id: cpu-arch
-    attributes:
-      label: CPU arch
-      description: You can find it on Linux with `uname -m`.
-      options:
-        - x86_64
-        - aarch64
-        - armv7l
-        - "386"
-        - s390x
-        - ppc64le
-  - type: dropdown
-    id: vpn-service-provider
-    attributes:
-      label: VPN service provider
-      options:
-        - Custom
-        - Cyberghost
-        - ExpressVPN
-        - FastestVPN
-        - HideMyAss
-        - IPVanish
-        - IVPN
-        - Mullvad
-        - NordVPN
-        - Privado
-        - Private Internet Access
-        - PrivateVPN
-        - ProtonVPN
-        - PureVPN
-        - Surfshark
-        - TorGuard
-        - VPNUnlimited
-        - VyprVPN
-        - WeVPN
-        - Windscribe
-    validations:
-      required: true
-  - type: dropdown
-    id: docker
-    attributes:
-      label: What are you using to run the container
-      options:
-        - docker run
-        - docker-compose
-        - Portainer
-        - Kubernetes
-        - Podman
-        - Other
-    validations:
-      required: true
-  - type: input
-    id: version
-    attributes:
-      label: What is the version of Gluetun
-      description: |
-        Copy paste the version line at the top of your logs.
-        It should be in the form `Running version latest built on 2020-03-13T01:30:06Z (commit d0f678c)`.
-    validations:
-      required: true
-  - type: textarea
-    id: problem
-    attributes:
-      label: "What's the problem 🤔"
-      placeholder: "That feature does not work..."
-    validations:
-      required: true
-  - type: textarea
-    id: logs
-    attributes:
-      label: Share your logs
-      description: No sensitive information is logged out except when running with `LOG_LEVEL=debug`.
-      render: log
-    validations:
-      required: true
-  - type: textarea
-    id: config
-    attributes:
-      label: Share your configuration
-      description: Share your configuration such as `docker-compose.yml`. Ensure to remove credentials.
-      render: yml
--- a/.github/ISSUE_TEMPLATE/config.yml
+++ b/.github/ISSUE_TEMPLATE/config.yml
@@ -1,7 +0,0 @@
-contact_links:
-  - name: Configuration help?
-    url: https://github.com/qdm12/gluetun/discussions/new
-    about: Please create a Github discussion.
-  - name: Unraid template issue
-    url: https://github.com/qdm12/gluetun/discussions/550
-    about: Please read the relevant Github discussion.
--- a/.github/ISSUE_TEMPLATE/feature_request.md
+++ b/.github/ISSUE_TEMPLATE/feature_request.md
@@ -0,0 +1,17 @@
+---
+name: Feature request
+about: Suggest a feature to add to this project
+title: 'Feature request: FILL THIS TEXT!'
+labels: ":bulb: feature request"
+assignees: qdm12
+
+---
+
+**What's the feature?** 🧐
+
+- Support this new feature because that and that
+
+**Optional extra information** 🚀
+
+- I tried `docker run something` and it doesn't work
+- That [url](https://github.com/qdm12/gluetun) is interesting
--- a/.github/ISSUE_TEMPLATE/feature_request.yml
+++ b/.github/ISSUE_TEMPLATE/feature_request.yml
@@ -1,19 +0,0 @@
-name: Feature request
-description: Suggest a feature to add to Gluetun
-title: "Feature request: "
-labels: [":bulb: feature request"]
-body:
-  - type: textarea
-    id: description
-    attributes:
-      label: "What's the feature 🧐"
-      placeholder: "Make the tunnel resistant to earth quakes"
-    validations:
-      required: true
-  - type: textarea
-    id: extra
-    attributes:
-      label: "Extra information and references"
-      placeholder: |
-        - I tried `docker run something` and it doesn't work
-        - That [url](https://github.com/qdm12/gluetun) is interesting
--- a/.github/ISSUE_TEMPLATE/help.md
+++ b/.github/ISSUE_TEMPLATE/help.md
@@ -0,0 +1,53 @@
+---
+name: Help
+about: Ask for help
+title: 'Help: FILL THIS TEXT!'
+labels: ":pray: help wanted"
+assignees:
+
+---
+
+**Host OS** (approximate answer is fine too): Ubuntu 18
+
+**Is this urgent?**: No
+
+**What VPN provider are you using**:
+
+**What is the version of the program** (See the line at the top of your logs)
+
+```
+Running version latest built on 2020-03-13T01:30:06Z (commit d0f678c)
+```
+
+**What's the problem** 🤔
+
+That feature doesn't work
+
+**Share your logs...**
+
+...*careful to remove i.e. token information with PIA port forwarding*
+
+```log
+
+PASTE YOUR LOGS
+IN THERE
+
+```
+
+**What are you using to run your container?**: Docker Compose
+
+Please also share your configuration file:
+
+```yml
+your .yml
+content
+in here
+```
+
+or
+
+```sh
+# your docker
+# run command
+# in here
+```
--- a/.github/ISSUE_TEMPLATE/provider.md
+++ b/.github/ISSUE_TEMPLATE/provider.md
@@ -1,17 +0,0 @@
---
-name: Support a VPN provider
-about: Suggest a VPN provider to be supported
-title: 'VPN provider support: NAME OF THE PROVIDER'
-labels: ":bulb: New provider"
-
---
-
-One of the following is required:
-
- Publicly accessible URL to a zip file containing the Openvpn configuration files
- Publicly accessible URL to a structured (JSON etc.) list of servers **and attach** an example Openvpn configuration file for both TCP and UDP
- Publicly accessible URL to the list of servers **and attach** an example Openvpn configuration file for both TCP and UDP
-
-If the list of servers requires to login **or** is hidden behind an interactive configurator,
-you can only use a custom Openvpn configuration file.
-[The Wiki](https://github.com/qdm12/gluetun/wiki/Openvpn-file) describes how to do so.
--- a/.github/ISSUE_TEMPLATE/wiki
+++ b/.github/ISSUE_TEMPLATE/wiki
@@ -1,18 +0,0 @@
-name: Wiki issue
-description: Report a Wiki issue
-title: "Wiki issue: "
-labels: ["📄 Wiki issue"]
-body:
-  - type: input
-    id: url
-    attributes:
-      label: "URL to the Wiki page"
-      placeholder: "https://github.com/qdm12/gluetun/wiki/OpenVPN-options"
-    validations:
-      required: true
-  - type: textarea
-    id: description
-    attributes:
-      label: "What's the issue?"
-    validations:
-      required: true
--- a/.github/labels.yml
+++ b/.github/labels.yml
@@ -14,71 +14,31 @@
  color: "795548"
  description: ""

-# Priority
- name: "🚨 Urgent"
-  color: "d5232f"
-  description: ""
- name: "💤 Low priority"
-  color: "4285f4"
-  description: ""
-
 # VPN providers
 - name: ":cloud: Cyberghost"
  color: "cfe8d4"
  description: ""
- name: ":cloud: HideMyAss"
-  color: "cfe8d4"
-  description: ""
- name: ":cloud: IPVanish"
-  color: "cfe8d4"
-  description: ""
- name: ":cloud: IVPN"
-  color: "cfe8d4"
-  description: ""
- name: ":cloud: ExpressVPN"
-  color: "cfe8d4"
-  description: ""
- name: ":cloud: FastestVPN"
-  color: "cfe8d4"
-  description: ""
 - name: ":cloud: Mullvad"
  color: "cfe8d4"
  description: ""
 - name: ":cloud: NordVPN"
  color: "cfe8d4"
  description: ""
- name: ":cloud: Perfect Privacy"
-  color: "cfe8d4"
-  description: ""
 - name: ":cloud: PIA"
  color: "cfe8d4"
  description: ""
 - name: ":cloud: Privado"
  color: "cfe8d4"
  description: ""
- name: ":cloud: PrivateVPN"
-  color: "cfe8d4"
-  description: ""
- name: ":cloud: ProtonVPN"
-  color: "cfe8d4"
 - name: ":cloud: PureVPN"
  color: "cfe8d4"
  description: ""
 - name: ":cloud: Surfshark"
  color: "cfe8d4"
  description: ""
- name: ":cloud: Torguard"
-  color: "cfe8d4"
-  description: ""
- name: ":cloud: VPNUnlimited"
-  color: "cfe8d4"
-  description: ""
 - name: ":cloud: Vyprvpn"
  color: "cfe8d4"
  description: ""
- name: ":cloud: WeVPN"
-  color: "cfe8d4"
-  description: ""
 - name: ":cloud: Windscribe"
  color: "cfe8d4"
  description: ""
@@ -87,9 +47,6 @@
 - name: "Openvpn"
  color: "ffc7ea"
  description: ""
- name: "Wireguard"
-  color: "ffc7ea"
-  description: ""
 - name: "Unbound (DNS over TLS)"
  color: "ffc7ea"
  description: ""
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -0,0 +1,100 @@
+name: CI
+on:
+  push:
+    paths:
+      - .github/workflows/build.yml
+      - cmd/**
+      - internal/**
+      - pkg/**
+      - .dockerignore
+      - .golangci.yml
+      - Dockerfile
+      - go.mod
+      - go.sum
+
+jobs:
+  verify:
+    runs-on: ubuntu-latest
+    env:
+      DOCKER_BUILDKIT: "1"
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Linting
+        run: docker build --target lint .
+
+      - name: Go mod tidy check
+        run: docker build --target tidy .
+
+      - name: Build test image
+        run: docker build --target test -t test-container .
+
+      - name: Run tests in test container
+        run: |
+          touch coverage.txt
+          docker run --rm \
+          -v "$(pwd)/coverage.txt:/tmp/gobuild/coverage.txt" \
+          test-container \
+          go test \
+          -race \
+          -coverpkg=./... \
+          -coverprofile=coverage.txt \
+          -covermode=atomic \
+          ./...
+
+      # We run this here to use the caching of the previous steps
+      - if: github.event_name == 'push'
+        name: Build final image
+        run: docker build .
+
+  publish:
+    needs: [verify]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: docker/setup-qemu-action@v1
+      - uses: docker/setup-buildx-action@v1
+
+      - uses: docker/login-action@v1
+        with:
+          username: qmcgaw
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+
+      - name: Set variables
+        id: vars
+        env:
+          EVENT_NAME: ${{ github.event_name }}
+        run: |
+          BRANCH=${GITHUB_REF#refs/heads/}
+          TAG=${GITHUB_REF#refs/tags/}
+          echo ::set-output name=commit::$(git rev-parse --short HEAD)
+          echo ::set-output name=build_date::$(date -u +%Y-%m-%dT%H:%M:%SZ)
+          if [ "$TAG" != "$GITHUB_REF" ]; then
+            echo ::set-output name=version::$TAG
+            echo ::set-output name=platforms::linux/amd64,linux/386,linux/arm64,linux/arm/v6,linux/arm/v7,linux/s390x,linux/ppc64le
+          elif [ "$BRANCH" = "master" ]; then
+            echo ::set-output name=version::latest
+            echo ::set-output name=platforms::linux/amd64,linux/386,linux/arm64,linux/arm/v6,linux/arm/v7,linux/s390x,linux/ppc64le
+          else
+            echo ::set-output name=version::$BRANCH
+            echo ::set-output name=platforms::linux/amd64,linux/386,linux/arm64,linux/arm/v6,linux/arm/v7
+          fi
+
+      - name: Build and push final image
+        uses: docker/build-push-action@v2
+        with:
+          platforms: ${{ steps.vars.outputs.platforms }}
+          build-args: |
+            BUILD_DATE=${{ steps.vars.outputs.build_date }}
+            COMMIT=${{ steps.vars.outputs.commit }}
+            VERSION=${{ steps.vars.outputs.version }}
+          tags: |
+            qmcgaw/gluetun:${{ steps.vars.outputs.version }}
+            qmcgaw/private-internet-access:${{ steps.vars.outputs.version }}
+          push: true
+
+      - if: github.event_name == 'push' && github.event.ref == 'refs/heads/master'
+        name: Microbadger hook
+        run: curl -X POST https://hooks.microbadger.com/images/qmcgaw/gluetun/l-keGI7p4IhX4QuIDMFYKhsZ1L0=
+        continue-on-error: true
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,144 +0,0 @@
-name: CI
-on:
-  release:
-    types:
-      - published
-  push:
-    branches:
-      - master
-    paths:
-      - .github/workflows/ci.yml
-      - cmd/**
-      - internal/**
-      - pkg/**
-      - .dockerignore
-      - .golangci.yml
-      - Dockerfile
-      - go.mod
-      - go.sum
-  pull_request:
-    branches:
-      - master
-    paths:
-      - .github/workflows/ci.yml
-      - cmd/**
-      - internal/**
-      - pkg/**
-      - .dockerignore
-      - .golangci.yml
-      - Dockerfile
-      - go.mod
-      - go.sum
-
-jobs:
-  verify:
-    # Only run if it's a push event or if it's a PR from this repository, and it is not dependabot.
-    if: |
-      github.actor != 'dependabot[bot]' &&
-      (github.event_name == 'push' ||
-      github.event_name == 'release' ||
-      (github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository))
-    runs-on: ubuntu-latest
-    env:
-      DOCKER_BUILDKIT: "1"
-    steps:
-      - uses: actions/checkout@v2.4.0
-
-      - name: Linting
-        run: docker build --target lint .
-
-      - name: Go mod tidy check
-        run: docker build --target tidy .
-
-      - name: Build test image
-        run: docker build --target test -t test-container .
-
-      - name: Run tests in test container
-        run: |
-          touch coverage.txt
-          docker run --rm \
-          -v "$(pwd)/coverage.txt:/tmp/gobuild/coverage.txt" \
-          test-container
-
-      - name: Code security analysis
-        uses: snyk/actions/golang@master
-        env:
-          SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
-
-      - name: Build final image
-        run: docker build -t final-image .
-
-      # - name: Image security analysis
-      #   uses: snyk/actions/docker@master
-      #   env:
-      #     SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
-      #   with:
-      #     image: final-image
-
-  publish:
-    # Only run if it's a push event or if it's a PR from this repository
-    if: |
-      github.event_name == 'push' ||
-      github.event_name == 'release' ||
-      (github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository)
-    needs: [verify]
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2.4.0
-
-      - uses: docker/setup-qemu-action@v1
-      - uses: docker/setup-buildx-action@v1
-
-      - uses: docker/login-action@v1
-        with:
-          username: qmcgaw
-          password: ${{ secrets.DOCKERHUB_PASSWORD }}
-
-      - name: Check for semver tag
-        id: semvercheck
-        run: |
-          if [[ ${{ github.ref }} =~ ^refs\/tags\/v0\.[0-9]+\.[0-9]+$ ]]; then
-            MATCH=true
-          else
-            MATCH=false
-          fi
-          if [[ ${{ github.ref }} =~ ^refs\/tags\/v[1-9]+\.[0-9]+\.[0-9]+$ ]]; then
-            MATCH=$MATCH_nonzero
-          fi
-          echo ::set-output name=match::$MATCH
-
-      # extract metadata (tags, labels) for Docker
-      # https://github.com/docker/metadata-action
-      - name: Extract Docker metadata
-        id: meta
-        uses: docker/metadata-action@v3
-        with:
-          flavor: |
-            latest=${{ github.ref == 'refs/heads/master' }}
-          images: |
-            qmcgaw/gluetun
-            qmcgaw/private-internet-access
-          tags: |
-            type=ref,event=branch,enable=${{ github.ref != 'refs/heads/master' }}
-            type=ref,event=pr
-            type=ref,event=tag,enable=${{ !startsWith(steps.semvercheck.outputs.match, 'true') }}
-            type=semver,pattern=v{{major}}.{{minor}}.{{patch}},enable=${{ startsWith(steps.semvercheck.outputs.match, 'true') }}
-            type=semver,pattern=v{{major}}.{{minor}},enable=${{ startsWith(steps.semvercheck.outputs.match, 'true') }}
-            type=semver,pattern=v{{major}},enable=${{ startsWith(steps.semvercheck.outputs.match, 'true_nonzero') }}
-            type=raw,value=latest,enable=${{ !startsWith(steps.semvercheck.outputs.match, 'true') }}
-
-      - name: Short commit
-        id: shortcommit
-        run: echo "::set-output name=value::$(git rev-parse --short HEAD)"
-
-      - name: Build and push final image
-        uses: docker/build-push-action@v2.7.0
-        with:
-          platforms: linux/amd64,linux/386,linux/arm64,linux/arm/v6,linux/arm/v7,linux/ppc64le
-          labels: ${{ steps.meta.outputs.labels }}
-          build-args: |
-            CREATED=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.created'] }}
-            COMMIT=${{ steps.shortcommit.outputs.value }}
-            VERSION=${{ fromJSON(steps.meta.outputs.json).labels['org.opencontainers.image.version'] }}
-          tags: ${{ steps.meta.outputs.tags }}
-          push: true
--- a/.github/workflows/dependabot.yml
+++ b/.github/workflows/dependabot.yml
@@ -1,37 +0,0 @@
-name: Dependabot
-on:
-  pull_request:
-    branches:
-      - master
-    paths:
-      - .github/workflows/dependabot.yml
-      - cmd/**
-      - internal/**
-      - pkg/**
-      - .dockerignore
-      - .golangci.yml
-      - Dockerfile
-      - go.mod
-      - go.sum
-
-jobs:
-  verify:
-    if: ${{ github.actor == 'dependabot[bot]' }}
-    runs-on: ubuntu-latest
-    env:
-      DOCKER_BUILDKIT: "1"
-    steps:
-      - uses: actions/checkout@v2.4.0
-
-      - name: Build test image
-        run: docker build --target test -t test-container .
-
-      - name: Run tests in test container
-        run: |
-          touch coverage.txt
-          docker run --rm \
-          -v "$(pwd)/coverage.txt:/tmp/gobuild/coverage.txt" \
-          test-container
-
-      - name: Build final image
-        run: docker build -t final-image .
--- a/.github/workflows/dockerhub-description.yml
+++ b/.github/workflows/dockerhub-description.yml
@@ -10,7 +10,7 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
-        uses: actions/checkout@v2.4.0
+        uses: actions/checkout@v2
      - name: Docker Hub Description
        uses: peter-evans/dockerhub-description@v2
        with:
--- a/.github/workflows/fork.yml
+++ b/.github/workflows/fork.yml
@@ -1,40 +0,0 @@
-name: Fork
-on:
-  pull_request:
-    branches:
-      - master
-    paths:
-      - .github/workflows/fork.yml
-      - cmd/**
-      - internal/**
-      - pkg/**
-      - .dockerignore
-      - .golangci.yml
-      - Dockerfile
-      - go.mod
-      - go.sum
-
-jobs:
-  verify:
-    if: github.event.pull_request.head.repo.full_name != github.repository && github.actor != 'dependabot[bot]'
-    runs-on: ubuntu-latest
-    env:
-      DOCKER_BUILDKIT: "1"
-    steps:
-      - uses: actions/checkout@v2.4.0
-
-      - name: Linting
-        run: docker build --target lint .
-
-      - name: Build test image
-        run: docker build --target test -t test-container .
-
-      - name: Run tests in test container
-        run: |
-          touch coverage.txt
-          docker run --rm \
-          -v "$(pwd)/coverage.txt:/tmp/gobuild/coverage.txt" \
-          test-container
-
-      - name: Build final image
-        run: docker build -t final-image .
--- a/.github/workflows/labels.yml
+++ b/.github/workflows/labels.yml
@@ -9,7 +9,7 @@ jobs:
  labeler:
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v2
      - uses: crazy-max/ghaction-github-labeler@v3
        with:
          yaml-file: .github/labels.yml
--- a/.github/workflows/misspell.yml
+++ b/.github/workflows/misspell.yml
@@ -8,7 +8,7 @@ jobs:
  misspell:
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v2
      - uses: reviewdog/action-misspell@v1
        with:
          locale: "US"
--- a/.gitignore
+++ b/.gitignore
@@ -1 +0,0 @@
-scratch.txt
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -1,4 +1,6 @@
 linters-settings:
+  maligned:
+    suggest-new: true
  misspell:
    locale: US

@@ -8,50 +10,21 @@ issues:
      linters:
        - dupl
        - maligned
-        - goerr113
-    - path: internal/server/
+    - path: internal/unix/constants\.go
      linters:
-        - dupl
-    - path: internal/configuration/
-      linters:
-        - dupl
-    - path: internal/constants/
-      linters:
-        - dupl
-    - text: "exported: exported var Err*"
-      linters:
-        - revive
-    - text: "mnd: Magic number: 0644*"
-      linters:
-        - gomnd
-    - text: "mnd: Magic number: 0400*"
-      linters:
-        - gomnd
-    - text: "variable 'mssFix' is only used in the if-statement*"
-      path: "openvpnconf.go"
-      linters:
-        - ifshort
-    - text: "variable 'auth' is only used in the if-statement*"
-      path: "openvpnconf.go"
-      linters:
-        - ifshort
+        - golint
+      text: don't use ALL_CAPS in Go names; use CamelCase
 linters:
+  disable-all: true
  enable:
-    # - cyclop
-    # - errorlint
-    # - ireturn
-    # - varnamelen
-    # - wrapcheck
    - asciicheck
-    - bidichk
    - bodyclose
+    - deadcode
    - dogsled
    - dupl
-    - durationcheck
-    - errname
+    - errcheck
    - exhaustive
    - exportloopref
-    - forcetypeassert
    - gci
    - gochecknoglobals
    - gochecknoinits
@@ -60,37 +33,34 @@ linters:
    - gocritic
    - gocyclo
    - godot
-    - goerr113
    - goheader
    - goimports
+    - golint
    - gomnd
-    - gomoddirectives
    - goprintffuncname
    - gosec
-    - ifshort
-    - importas
+    - gosimple
+    - govet
+    - ineffassign
+    - interfacer
    - lll
-    - makezero
+    - maligned
    - misspell
    - nakedret
    - nestif
-    - nilerr
-    - nilnil
    - noctx
    - nolintlint
    - prealloc
-    - predeclared
-    - predeclared
-    - promlinter
-    - revive
    - rowserrcheck
+    - scopelint
    - sqlclosecheck
-    - tenv
-    - thelper
-    - tparallel
+    - staticcheck
+    - structcheck
+    - typecheck
    - unconvert
    - unparam
-    - wastedassign
+    - unused
+    - varcheck
    - whitespace

 run:
--- a/175
+++ b/175
@@ -1,36 +1,31 @@
-ARG ALPINE_VERSION=3.15
-ARG GO_ALPINE_VERSION=3.15
-ARG GO_VERSION=1.17
-ARG XCPUTRANSLATE_VERSION=v0.6.0
-ARG GOLANGCI_LINT_VERSION=v1.43.0
+ARG ALPINE_VERSION=3.12
+ARG GO_VERSION=1.15
 ARG BUILDPLATFORM=linux/amd64

-FROM --platform=${BUILDPLATFORM} qmcgaw/xcputranslate:${XCPUTRANSLATE_VERSION} AS xcputranslate
-FROM --platform=${BUILDPLATFORM} qmcgaw/binpot:golangci-lint-${GOLANGCI_LINT_VERSION} AS golangci-lint
-
-FROM --platform=${BUILDPLATFORM} golang:${GO_VERSION}-alpine${GO_ALPINE_VERSION} AS base
-COPY --from=xcputranslate /xcputranslate /usr/local/bin/xcputranslate
-RUN apk --update add git g++
+FROM --platform=$BUILDPLATFORM golang:${GO_VERSION}-alpine${ALPINE_VERSION} AS base
+RUN apk --update add git
 ENV CGO_ENABLED=0
-COPY --from=golangci-lint /bin /go/bin/golangci-lint
 WORKDIR /tmp/gobuild
 COPY go.mod go.sum ./
 RUN go mod download
 COPY cmd/ ./cmd/
 COPY internal/ ./internal/

-FROM --platform=${BUILDPLATFORM} base AS test
+FROM --platform=$BUILDPLATFORM base AS test
 # Note on the go race detector:
 # - we set CGO_ENABLED=1 to have it enabled
-# - we installed g++ to support the race detector
+# - we install g++ to support the race detector
 ENV CGO_ENABLED=1
-ENTRYPOINT go test -race -coverpkg=./... -coverprofile=coverage.txt -covermode=atomic ./...
+RUN apk --update --no-cache add g++

-FROM --platform=${BUILDPLATFORM} base AS lint
+FROM --platform=$BUILDPLATFORM base AS lint
+ARG GOLANGCI_LINT_VERSION=v1.35.2
+RUN wget -O- -nv https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | \
+    sh -s -- -b /usr/local/bin ${GOLANGCI_LINT_VERSION}
 COPY .golangci.yml ./
 RUN golangci-lint run --timeout=10m

-FROM --platform=${BUILDPLATFORM} base AS tidy
+FROM --platform=$BUILDPLATFORM base AS tidy
 RUN git init && \
    git config user.email ci@localhost && \
    git config user.name ci && \
@@ -39,26 +34,27 @@ RUN git init && \
    go mod tidy && \
    git diff --exit-code -- go.mod

-FROM --platform=${BUILDPLATFORM} base AS build
+FROM --platform=$BUILDPLATFORM base AS build
+COPY --from=qmcgaw/xcputranslate:v0.4.0 /xcputranslate /usr/local/bin/xcputranslate
 ARG TARGETPLATFORM
 ARG VERSION=unknown
-ARG CREATED="an unknown date"
+ARG BUILD_DATE="an unknown date"
 ARG COMMIT=unknown
-RUN GOARCH="$(xcputranslate translate -field arch -targetplatform ${TARGETPLATFORM})" \
-    GOARM="$(xcputranslate translate -field arm -targetplatform ${TARGETPLATFORM})" \
+RUN GOARCH="$(xcputranslate -field arch -targetplatform ${TARGETPLATFORM})" \
+    GOARM="$(xcputranslate -field arm -targetplatform ${TARGETPLATFORM})" \
    go build -trimpath -ldflags="-s -w \
    -X 'main.version=$VERSION' \
-    -X 'main.created=$CREATED' \
+    -X 'main.buildDate=$BUILD_DATE' \
    -X 'main.commit=$COMMIT' \
    " -o entrypoint cmd/gluetun/main.go

 FROM alpine:${ALPINE_VERSION}
 ARG VERSION=unknown
-ARG CREATED="an unknown date"
+ARG BUILD_DATE="an unknown date"
 ARG COMMIT=unknown
 LABEL \
    org.opencontainers.image.authors="quentin.mcgaw@gmail.com" \
-    org.opencontainers.image.created=$CREATED \
+    org.opencontainers.image.created=$BUILD_DATE \
    org.opencontainers.image.version=$VERSION \
    org.opencontainers.image.revision=$COMMIT \
    org.opencontainers.image.url="https://github.com/qdm12/gluetun" \
@@ -67,72 +63,50 @@ LABEL \
    org.opencontainers.image.title="VPN swiss-knife like client for multiple VPN providers" \
    org.opencontainers.image.description="VPN swiss-knife like client to tunnel to multiple VPN servers using OpenVPN, IPtables, DNS over TLS, Shadowsocks, an HTTP proxy and Alpine Linux"
 ENV VPNSP=pia \
-    VPN_TYPE=openvpn \
-    # OpenVPN
-    OPENVPN_PROTOCOL=udp \
-    OPENVPN_USER= \
-    OPENVPN_PASSWORD= \
-    OPENVPN_USER_SECRETFILE=/run/secrets/openvpn_user \
-    OPENVPN_PASSWORD_SECRETFILE=/run/secrets/openvpn_password \
-    OPENVPN_VERSION=2.5 \
+    VERSION_INFORMATION=on \
+    PROTOCOL=udp \
    OPENVPN_VERBOSITY=1 \
-    OPENVPN_FLAGS= \
-    OPENVPN_CIPHER= \
-    OPENVPN_AUTH= \
-    OPENVPN_ROOT=yes \
+    OPENVPN_ROOT=no \
    OPENVPN_TARGET_IP= \
    OPENVPN_IPV6=off \
-    OPENVPN_CUSTOM_CONFIG= \
-    OPENVPN_INTERFACE=tun0 \
-    OPENVPN_PORT= \
-    # Wireguard
-    WIREGUARD_PRIVATE_KEY= \
-    WIREGUARD_PRESHARED_KEY= \
-    WIREGUARD_PUBLIC_KEY= \
-    WIREGUARD_ADDRESS= \
-    WIREGUARD_ENDPOINT_IP= \
-    WIREGUARD_ENDPOINT_PORT= \
-    WIREGUARD_INTERFACE=wg0 \
-    # VPN server filtering
+    TZ= \
+    PUID= \
+    PGID= \
+    PUBLICIP_FILE="/tmp/gluetun/ip" \
+    # PIA, Windscribe, Surfshark, Cyberghost, Vyprvpn, NordVPN, PureVPN only
+    OPENVPN_USER= \
+    OPENVPN_PASSWORD= \
+    USER_SECRETFILE=/run/secrets/openvpn_user \
+    PASSWORD_SECRETFILE=/run/secrets/openvpn_password \
    REGION= \
-    COUNTRY= \
-    CITY= \
-    SERVER_HOSTNAME= \
-    # # Mullvad only:
-    ISP= \
-    OWNED=no \
-    # # Private Internet Access only:
-    PIA_ENCRYPTION= \
+    # PIA only
+    PIA_ENCRYPTION=strong \
    PORT_FORWARDING=off \
    PORT_FORWARDING_STATUS_FILE="/tmp/gluetun/forwarded_port" \
-    # # Cyberghost only:
+    # Mullvad and PureVPN only
+    COUNTRY= \
+    # Mullvad, PureVPN, Windscribe only
+    CITY= \
+    # Windscribe only
+    SERVER_HOSTNAME= \
+    # Mullvad only
+    ISP= \
+    OWNED=no \
+    # Mullvad and Windscribe only
+    PORT= \
+    # Cyberghost only
+    CYBERGHOST_GROUP="Premium UDP Europe" \
    OPENVPN_CLIENTCRT_SECRETFILE=/run/secrets/openvpn_clientcrt \
    OPENVPN_CLIENTKEY_SECRETFILE=/run/secrets/openvpn_clientkey \
-    # # Nordvpn only:
+    # NordVPN only
    SERVER_NUMBER= \
-    # # PIA and ProtonVPN only:
-    SERVER_NAME= \
-    # # ProtonVPN only:
-    FREE_ONLY= \
-    # # Surfshark only:
-    MULTIHOP_ONLY= \
-    # Firewall
-    FIREWALL=on \
-    FIREWALL_VPN_INPUT_PORTS= \
-    FIREWALL_INPUT_PORTS= \
-    FIREWALL_OUTBOUND_SUBNETS= \
-    FIREWALL_DEBUG=off \
-    # Logging
-    LOG_LEVEL=info \
-    # Health
-    HEALTH_SERVER_ADDRESS=127.0.0.1:9999 \
-    HEALTH_ADDRESS_TO_PING=github.com \
-    HEALTH_VPN_DURATION_INITIAL=6s \
-    HEALTH_VPN_DURATION_ADDITION=5s \
+    # Openvpn
+    OPENVPN_CIPHER= \
+    OPENVPN_AUTH= \
    # DNS over TLS
    DOT=on \
    DOT_PROVIDERS=cloudflare \
-    DOT_PRIVATE_ADDRESS=127.0.0.1/8,10.0.0.0/8,172.16.0.0/12,192.168.0.0/16,169.254.0.0/16,::1/128,fc00::/7,fe80::/10,::ffff:7f00:1/104,::ffff:a00:0/104,::ffff:a9fe:0/112,::ffff:ac10:0/108,::ffff:c0a8:0/112 \
+    DOT_PRIVATE_ADDRESS=127.0.0.1/8,10.0.0.0/8,172.16.0.0/12,192.168.0.0/16,169.254.0.0/16,::1/128,fc00::/7,fe80::/10,::ffff:0:0/96 \
    DOT_VERBOSITY=1 \
    DOT_VERBOSITY_DETAILS=0 \
    DOT_VALIDATION_LOGLEVEL=0 \
@@ -143,12 +117,18 @@ ENV VPNSP=pia \
    BLOCK_ADS=off \
    UNBLOCK= \
    DNS_UPDATE_PERIOD=24h \
-    DNS_PLAINTEXT_ADDRESS=127.0.0.1 \
+    DNS_PLAINTEXT_ADDRESS=1.1.1.1 \
    DNS_KEEP_NAMESERVER=off \
+    # Firewall
+    FIREWALL=on \
+    FIREWALL_VPN_INPUT_PORTS= \
+    FIREWALL_INPUT_PORTS= \
+    FIREWALL_OUTBOUND_SUBNETS= \
+    FIREWALL_DEBUG=off \
    # HTTP proxy
    HTTPPROXY= \
    HTTPPROXY_LOG=off \
-    HTTPPROXY_LISTENING_ADDRESS=":8888" \
+    HTTPPROXY_PORT=8888 \
    HTTPPROXY_USER= \
    HTTPPROXY_PASSWORD= \
    HTTPPROXY_USER_SECRETFILE=/run/secrets/httpproxy_user \
@@ -156,34 +136,19 @@ ENV VPNSP=pia \
    # Shadowsocks
    SHADOWSOCKS=off \
    SHADOWSOCKS_LOG=off \
-    SHADOWSOCKS_LISTENING_ADDRESS=":8388" \
+    SHADOWSOCKS_PORT=8388 \
    SHADOWSOCKS_PASSWORD= \
    SHADOWSOCKS_PASSWORD_SECRETFILE=/run/secrets/shadowsocks_password \
-    SHADOWSOCKS_CIPHER=chacha20-ietf-poly1305 \
-    # Server data updater
-    UPDATER_PERIOD=0 \
-    # Public IP
-    PUBLICIP_FILE="/tmp/gluetun/ip" \
-    PUBLICIP_PERIOD=12h \
-    # Extras
-    VERSION_INFORMATION=on \
-    TZ= \
-    PUID= \
-    PGID=
-ENTRYPOINT ["/gluetun-entrypoint"]
+    SHADOWSOCKS_METHOD=chacha20-ietf-poly1305 \
+    UPDATER_PERIOD=0
+ENTRYPOINT ["/entrypoint"]
 EXPOSE 8000/tcp 8888/tcp 8388/tcp 8388/udp
-HEALTHCHECK --interval=5s --timeout=5s --start-period=10s --retries=1 CMD /gluetun-entrypoint healthcheck
-ARG TARGETPLATFORM
-RUN apk add --no-cache --update -l apk-tools && \
-    apk add --no-cache --update -X "https://dl-cdn.alpinelinux.org/alpine/v3.12/main" openvpn==2.4.11-r0 && \
-    mv /usr/sbin/openvpn /usr/sbin/openvpn2.4 && \
-    apk del openvpn && \
-    apk add --no-cache --update openvpn ca-certificates iptables ip6tables unbound tzdata && \
-    mv /usr/sbin/openvpn /usr/sbin/openvpn2.5 && \
-    # Fix vulnerability issue
-    apk add --no-cache --update busybox && \
-    rm -rf /var/cache/apk/* /etc/unbound/* /usr/sbin/unbound-* /etc/openvpn/*.sh /usr/lib/openvpn/plugins/openvpn-plugin-down-root.so && \
+HEALTHCHECK --interval=5s --timeout=5s --start-period=10s --retries=1 CMD /entrypoint healthcheck
+RUN apk add -q --progress --no-cache --update openvpn ca-certificates iptables ip6tables unbound tzdata && \
+    rm -rf /var/cache/apk/* /etc/unbound/* /usr/sbin/unbound-* && \
    deluser openvpn && \
    deluser unbound && \
    mkdir /gluetun
-COPY --from=build /tmp/gobuild/entrypoint /gluetun-entrypoint
+# TODO remove once SAN is added to PIA servers certificates, see https://github.com/pia-foss/manual-connections/issues/10
+ENV GODEBUG=x509ignoreCN=0
+COPY --from=build /tmp/gobuild/entrypoint /entrypoint
--- a/README.md
+++ b/README.md
@@ -1,127 +1,116 @@
 # Gluetun VPN client

-*Lightweight swiss-knife-like VPN client to tunnel to Cyberghost, ExpressVPN, FastestVPN,
-HideMyAss, IPVanish, IVPN, Mullvad, NordVPN, Perfect Privacy, Privado, Private Internet Access, PrivateVPN,
-ProtonVPN, PureVPN, Surfshark, TorGuard, VPNUnlimited, VyprVPN, WeVPN and Windscribe VPN servers
-using Go, OpenVPN or Wireguard, iptables, DNS over TLS, ShadowSocks and an HTTP proxy*
+*Lightweight swiss-knife-like VPN client to tunnel to Private Internet Access,
+Mullvad, Windscribe, Surfshark Cyberghost, VyprVPN, NordVPN, PureVPN and Privado VPN servers, using Go, OpenVPN, iptables, DNS over TLS, ShadowSocks and an HTTP proxy*

-**ANNOUNCEMENT**: Large settings refactor merged on 2022-06-01, please file issues if you find any problem!
+**ANNOUNCEMENT**: *New Docker image name `qmcgaw/gluetun`*

-![Title image](https://raw.githubusercontent.com/qdm12/gluetun/master/title.svg)
+<img height="250" src="https://raw.githubusercontent.com/qdm12/gluetun/master/title.svg?sanitize=true">

-[![Build status](https://github.com/qdm12/gluetun/actions/workflows/ci.yml/badge.svg)](https://github.com/qdm12/gluetun/actions/workflows/ci.yml)
+[![Size](https://img.shields.io/docker/image-size/qmcgaw/gluetun?sort=semver&label=Last%20released%20image)](https://hub.docker.com/r/qmcgaw/gluetun/tags?page=1&ordering=last_updated)
+[![Size](https://img.shields.io/docker/image-size/qmcgaw/gluetun/latest?label=Latest%20image)](https://hub.docker.com/r/qmcgaw/gluetun/tags)

-[![Docker pulls qmcgaw/gluetun](https://img.shields.io/docker/pulls/qmcgaw/gluetun.svg)](https://hub.docker.com/r/qmcgaw/gluetun)
-[![Docker pulls qmcgaw/private-internet-access](https://img.shields.io/docker/pulls/qmcgaw/private-internet-access.svg)](https://hub.docker.com/r/qmcgaw/gluetun)
-
-[![Docker stars qmcgaw/gluetun](https://img.shields.io/docker/stars/qmcgaw/gluetun.svg)](https://hub.docker.com/r/qmcgaw/gluetun)
-[![Docker stars qmcgaw/private-internet-access](https://img.shields.io/docker/stars/qmcgaw/private-internet-access.svg)](https://hub.docker.com/r/qmcgaw/gluetun)
+[![Docker Pulls](https://img.shields.io/docker/pulls/qmcgaw/private-internet-access.svg)](https://hub.docker.com/r/qmcgaw/private-internet-access)
+[![Docker Pulls](https://img.shields.io/docker/pulls/qmcgaw/gluetun.svg)](https://hub.docker.com/r/qmcgaw/gluetun)

 ![Last release](https://img.shields.io/github/release/qdm12/gluetun?label=Last%20release)
 ![Last Docker tag](https://img.shields.io/docker/v/qmcgaw/gluetun?sort=semver&label=Last%20Docker%20tag)
-[![Last release size](https://img.shields.io/docker/image-size/qmcgaw/gluetun?sort=semver&label=Last%20released%20image)](https://hub.docker.com/r/qmcgaw/gluetun/tags?page=1&ordering=last_updated)
-![GitHub last release date](https://img.shields.io/github/release-date/qdm12/gluetun?label=Last%20release%20date)
+![GitHub Release Date](https://img.shields.io/github/release-date/qdm12/gluetun?label=Last%20release%20date)
+
 ![Commits since release](https://img.shields.io/github/commits-since/qdm12/gluetun/latest?sort=semver)
-
-[![Latest size](https://img.shields.io/docker/image-size/qmcgaw/gluetun/latest?label=Latest%20image)](https://hub.docker.com/r/qmcgaw/gluetun/tags)
-
-[![GitHub last commit](https://img.shields.io/github/last-commit/qdm12/gluetun.svg)](https://github.com/qdm12/gluetun/commits/master)
-[![GitHub commit activity](https://img.shields.io/github/commit-activity/y/qdm12/gluetun.svg)](https://github.com/qdm12/gluetun/graphs/contributors)
-[![GitHub closed PRs](https://img.shields.io/github/issues-pr-closed/qdm12/gluetun.svg)](https://github.com/qdm12/gluetun/pulls?q=is%3Apr+is%3Aclosed)
-[![GitHub issues](https://img.shields.io/github/issues/qdm12/gluetun.svg)](https://github.com/qdm12/gluetun/issues)
-[![GitHub closed issues](https://img.shields.io/github/issues-closed/qdm12/gluetun.svg)](https://github.com/qdm12/gluetun/issues?q=is%3Aissue+is%3Aclosed)
+[![GitHub last commit](https://img.shields.io/github/last-commit/qdm12/gluetun.svg)](https://github.com/qdm12/gluetun/commits)

 [![Lines of code](https://img.shields.io/tokei/lines/github/qdm12/gluetun)](https://github.com/qdm12/gluetun)
-![Code size](https://img.shields.io/github/languages/code-size/qdm12/gluetun)
-![GitHub repo size](https://img.shields.io/github/repo-size/qdm12/gluetun)
-![Go version](https://img.shields.io/github/go-mod/go-version/qdm12/gluetun)
-
-![Visitors count](https://visitor-badge.laobi.icu/badge?page_id=gluetun.readme)

 ## Quick links

- [Setup](#Setup)
- [Features](#Features)
- Problem?
-  - [Check the Wiki](https://github.com/qdm12/gluetun/wiki)
+- Problem or suggestion?
  - [Start a discussion](https://github.com/qdm12/gluetun/discussions)
-  - [Fix the Unraid template](https://github.com/qdm12/gluetun/discussions/550)
- Suggestion?
  - [Create an issue](https://github.com/qdm12/gluetun/issues)
+  - [Check the Wiki](https://github.com/qdm12/gluetun/wiki)
  - [Join the Slack channel](https://join.slack.com/t/qdm12/shared_invite/enQtOTE0NjcxNTM1ODc5LTYyZmVlOTM3MGI4ZWU0YmJkMjUxNmQ4ODQ2OTAwYzMxMTlhY2Q1MWQyOWUyNjc2ODliNjFjMDUxNWNmNzk5MDk)
 - Happy?
  - Sponsor me on [github.com/sponsors/qdm12](https://github.com/sponsors/qdm12)
  - Donate to [paypal.me/qmcgaw](https://www.paypal.me/qmcgaw)
  - Drop me [an email](mailto:quentin.mcgaw@gmail.com)
- Video:
-
-  [![Video Gif](https://i.imgur.com/CetWunc.gif)](https://youtu.be/0F6I03LQcI4)
-
- [Substack Console interview](https://console.substack.com/p/console-72)

 ## Features

- Based on Alpine 3.15 for a small Docker image of 29MB
- Supports: **Cyberghost**, **ExpressVPN**, **FastestVPN**, **HideMyAss**, **IPVanish**, **IVPN**, **Mullvad**, **NordVPN**, **Perfect Privacy**, **Privado**, **Private Internet Access**, **PrivateVPN**, **ProtonVPN**, **PureVPN**,  **Surfshark**, **TorGuard**, **VPNUnlimited**, **Vyprvpn**, **WeVPN**, **Windscribe** servers
- Supports OpenVPN for all providers listed
- Supports Wireguard both kernelspace and userspace
-  - For **Mullvad**, **Ivpn** and **Windscribe**
-  - For **Torguard**, **VPN Unlimited** and **WeVPN** using [the custom provider](https://github.com/qdm12/gluetun/wiki/Custom-provider)
-  - For custom Wireguard configurations using [the custom provider](https://github.com/qdm12/gluetun/wiki/Custom-provider)
-  - More in progress, see [#134](https://github.com/qdm12/gluetun/issues/134)
+- Based on Alpine 3.12 for a small Docker image of 52MB
+- Supports **Private Internet Access**, **Mullvad**, **Windscribe**, **Surfshark**, **Cyberghost**, **Vyprvpn**, **NordVPN**, **PureVPN** and **Privado** servers
+- Supports Openvpn only for now
 - DNS over TLS baked in with service provider(s) of your choice
 - DNS fine blocking of malicious/ads/surveillance hostnames and IP addresses, with live update every 24 hours
 - Choose the vpn network protocol, `udp` or `tcp`
 - Built in firewall kill switch to allow traffic only with needed the VPN servers and LAN devices
 - Built in Shadowsocks proxy (protocol based on SOCKS5 with an encryption layer, tunnels TCP+UDP)
 - Built in HTTP proxy (tunnels HTTP and HTTPS through TCP)
- [Connect other containers to it](https://github.com/qdm12/gluetun/wiki/Connect-a-container-to-gluetun)
- [Connect LAN devices to it](https://github.com/qdm12/gluetun/wiki/Connect-a-LAN-device-to-gluetun)
- Compatible with amd64, i686 (32 bit), **ARM** 64 bit, ARM 32 bit v6 and v7, and even ppc64le 🎆
- [Custom VPN server side port forwarding for Private Internet Access](https://github.com/qdm12/gluetun/wiki/Private-internet-access#vpn-server-port-forwarding)
+- [Connect other containers to it](https://github.com/qdm12/gluetun/wiki/Connect-to-gluetun)
+- [Connect LAN devices to it](https://github.com/qdm12/gluetun/wiki/Connect-to-gluetun)
+- Compatible with amd64, i686 (32 bit), **ARM** 64 bit, ARM 32 bit v6 and v7, and even s390x as well as ppc64le 🎆
+- VPN server side port forwarding for Private Internet Access and Vyprvpn
 - Possibility of split horizon DNS by selecting multiple DNS over TLS providers
- Unbound subprogram drops root privileges once launched
+- Subprograms all drop root privileges once launched
+- Subprograms output streams are all merged together
 - Can work as a Kubernetes sidecar container, thanks @rorph

 ## Setup

-🎉 There are now instructions specific to each VPN provider with examples to help you get started as quickly as possible!
+1. On some devices you may need to setup your tunnel kernel module on your host with `insmod /lib/modules/tun.ko` or `modprobe tun`
+    - [Synology users Wiki page](https://github.com/qdm12/gluetun/wiki/Synology-setup)
+1. Launch the container with:

-Go to the [Wiki](https://github.com/qdm12/gluetun/wiki)!
+    ```bash
+    docker run -d --name gluetun --cap-add=NET_ADMIN \
+    -e VPNSP="private internet access" -e REGION="CA Montreal" \
+    -e OPENVPN_USER=js89ds7 -e OPENVPN_PASSWORD=8fd9s239G \
+    -v /yourpath:/gluetun \
+    qmcgaw/gluetun
+    ```

-[🐛 Found a bug in the Wiki?!](https://github.com/qdm12/gluetun/issues/new?assignees=&labels=%F0%9F%93%84+Wiki+issue&template=wiki+issue.yml&title=Wiki+issue%3A+)
+    or use [docker-compose.yml](https://github.com/qdm12/gluetun/blob/master/docker-compose.yml) with:

-Here's a docker-compose.yml for the laziest:
+    ```bash
+    echo "your openvpn username" > openvpn_user
+    echo "your openvpn password" > openvpn_password
+    docker-compose up -d
+    ```

-```yml
-version: "3"
-services:
-  gluetun:
-    image: qmcgaw/gluetun
-    # container_name: gluetun
-    # line above must be uncommented to allow external containers to connect. See https://github.com/qdm12/gluetun/wiki/Connect-a-container-to-gluetun#external-container-to-gluetun
-    cap_add:
-      - NET_ADMIN
-    ports:
-      - 8888:8888/tcp # HTTP proxy
-      - 8388:8388/tcp # Shadowsocks
-      - 8388:8388/udp # Shadowsocks
-    volumes:
-      - /yourpath:/gluetun
-    environment:
-      # See https://github.com/qdm12/gluetun/wiki
-      - VPNSP=ivpn
-      - VPN_TYPE=openvpn
-      # OpenVPN:
-      - OPENVPN_USER=
-      - OPENVPN_PASSWORD=
-      # Wireguard:
-      # - WIREGUARD_PRIVATE_KEY=wOEI9rqqbDwnN8/Bpp22sVz48T71vJ4fYmFWujulwUU=
-      # - WIREGUARD_ADDRESS=10.64.222.21/32
-      # Timezone for accurate log times
-      - TZ=
-```
+    You should probably check the many [environment variables](https://github.com/qdm12/gluetun/wiki/Environment-variables) available to adapt the container to your needs.
+
+## Further setup
+
+The following points are all optional but should give you insights on all the possibilities with this container.
+
+- Use [Docker secrets](https://github.com/qdm12/gluetun/wiki/Docker-secrets) to read your credentials instead of environment variables
+- [Test your setup](https://github.com/qdm12/gluetun/wiki/Test-your-setup)
+- [How to connect other containers and devices to Gluetun](https://github.com/qdm12/gluetun/wiki/Connect-to-gluetun)
+- [VPN server side port forwarding](https://github.com/qdm12/gluetun/wiki/Port-forwarding)
+- [HTTP control server](https://github.com/qdm12/gluetun/wiki/HTTP-Control-server) to automate things, restart Openvpn etc.
+- Update the image with `docker pull qmcgaw/gluetun:latest`. See this [Wiki document](https://github.com/qdm12/gluetun/wiki/Docker-image-tags) for Docker tags available.

 ## License

 [![MIT](https://img.shields.io/github/license/qdm12/gluetun)](https://github.com/qdm12/gluetun/master/LICENSE)
+
+## Metadata
+
+[![GitHub commit activity](https://img.shields.io/github/commit-activity/y/qdm12/gluetun.svg)](https://github.com/qdm12/gluetun/commits)
+[![GitHub closed PRs](https://img.shields.io/github/issues-pr-closed/qdm12/gluetun.svg)](https://github.com/qdm12/gluetun/pulls?q=is%3Apr+is%3Aclosed)
+
+[![GitHub issues](https://img.shields.io/github/issues/qdm12/gluetun.svg)](https://github.com/qdm12/gluetun/issues)
+[![GitHub closed issues](https://img.shields.io/github/issues-closed/qdm12/gluetun.svg)](https://github.com/qdm12/gluetun/issues?q=is%3Aissue+is%3Aclosed)
+
+![Visitors count](https://visitor-badge.laobi.icu/badge?page_id=gluetun.readme)
+![GitHub stars](https://img.shields.io/github/stars/qdm12/gluetun?style=social)
+![GitHub watchers](https://img.shields.io/github/watchers/qdm12/gluetun?style=social)
+![Contributors](https://img.shields.io/github/contributors/qdm12/gluetun)
+![GitHub forks](https://img.shields.io/github/forks/qdm12/gluetun?style=social)
+
+![Code size](https://img.shields.io/github/languages/code-size/qdm12/gluetun)
+![GitHub repo size](https://img.shields.io/github/repo-size/qdm12/gluetun)
+
+[![dockeri.co](https://dockeri.co/image/qmcgaw/gluetun)](https://hub.docker.com/r/qmcgaw/gluetun)
+
+![Docker Layers for latest](https://img.shields.io/microbadger/layers/qmcgaw/gluetun/latest?label=Docker%20image%20layers)
+![Go version](https://img.shields.io/github/go-mod/go-version/qdm12/gluetun)
--- a/cmd/gluetun/main.go
+++ b/cmd/gluetun/main.go
@@ -2,111 +2,98 @@ package main

 import (
 	"context"
-	"errors"
 	"fmt"
+	"net"
 	"net/http"
-	"os"
+	nativeos "os"
 	"os/signal"
 	"strings"
+	"sync"
 	"syscall"
 	"time"
-	_ "time/tzdata"

-	_ "github.com/breml/rootcerts"
 	"github.com/qdm12/dns/pkg/unbound"
 	"github.com/qdm12/gluetun/internal/alpine"
 	"github.com/qdm12/gluetun/internal/cli"
-	"github.com/qdm12/gluetun/internal/configuration/sources"
-	"github.com/qdm12/gluetun/internal/configuration/sources/env"
-	"github.com/qdm12/gluetun/internal/configuration/sources/files"
-	"github.com/qdm12/gluetun/internal/configuration/sources/mux"
-	"github.com/qdm12/gluetun/internal/configuration/sources/secrets"
 	"github.com/qdm12/gluetun/internal/constants"
 	"github.com/qdm12/gluetun/internal/dns"
 	"github.com/qdm12/gluetun/internal/firewall"
 	"github.com/qdm12/gluetun/internal/healthcheck"
 	"github.com/qdm12/gluetun/internal/httpproxy"
+	gluetunLogging "github.com/qdm12/gluetun/internal/logging"
 	"github.com/qdm12/gluetun/internal/models"
-	"github.com/qdm12/gluetun/internal/netlink"
 	"github.com/qdm12/gluetun/internal/openvpn"
-	"github.com/qdm12/gluetun/internal/portforward"
+	"github.com/qdm12/gluetun/internal/params"
 	"github.com/qdm12/gluetun/internal/publicip"
 	"github.com/qdm12/gluetun/internal/routing"
 	"github.com/qdm12/gluetun/internal/server"
+	"github.com/qdm12/gluetun/internal/settings"
 	"github.com/qdm12/gluetun/internal/shadowsocks"
 	"github.com/qdm12/gluetun/internal/storage"
-	"github.com/qdm12/gluetun/internal/tun"
+	"github.com/qdm12/gluetun/internal/unix"
 	"github.com/qdm12/gluetun/internal/updater"
-	"github.com/qdm12/gluetun/internal/vpn"
+	versionpkg "github.com/qdm12/gluetun/internal/version"
 	"github.com/qdm12/golibs/command"
 	"github.com/qdm12/golibs/logging"
-	"github.com/qdm12/goshutdown"
-	"github.com/qdm12/goshutdown/goroutine"
-	"github.com/qdm12/goshutdown/group"
-	"github.com/qdm12/goshutdown/order"
-	"github.com/qdm12/gosplash"
+	"github.com/qdm12/golibs/os"
+	"github.com/qdm12/golibs/os/user"
 	"github.com/qdm12/updated/pkg/dnscrypto"
 )

 //nolint:gochecknoglobals
 var (
-	version = "unknown"
-	commit  = "unknown"
-	created = "an unknown date"
-)
-
-var (
-	errSetupRouting = errors.New("cannot setup routing")
-	errCreateUser   = errors.New("cannot create user")
+	version   = "unknown"
+	commit    = "unknown"
+	buildDate = "an unknown date"
 )

 func main() {
 	buildInfo := models.BuildInformation{
-		Version: version,
-		Commit:  commit,
-		Created: created,
+		Version:   version,
+		Commit:    commit,
+		BuildDate: buildDate,
 	}

-	background := context.Background()
-	signalCtx, stop := signal.NotifyContext(background, syscall.SIGINT, syscall.SIGTERM, os.Interrupt)
-	ctx, cancel := context.WithCancel(background)
+	ctx := context.Background()
+	ctx, cancel := context.WithCancel(ctx)

-	logger := logging.New(logging.Settings{
-		Level: logging.LevelInfo,
-	})
+	logger, err := logging.NewLogger(logging.ConsoleEncoding, logging.InfoLevel)
+	if err != nil {
+		fmt.Println(err)
+		nativeos.Exit(1)
+	}

-	args := os.Args
-	tun := tun.New()
-	netLinker := netlink.New()
+	args := nativeos.Args
+	os := os.New()
+	osUser := user.New()
+	unix := unix.New()
 	cli := cli.New()
-	cmder := command.NewCmder()
-
-	envReader := env.New(logger)
-	filesReader := files.New()
-	secretsReader := secrets.New()
-	muxReader := mux.New(envReader, filesReader, secretsReader)

 	errorCh := make(chan error)
 	go func() {
-		errorCh <- _main(ctx, buildInfo, args, logger, muxReader, tun, netLinker, cmder, cli)
+		errorCh <- _main(ctx, buildInfo, args, logger, os, osUser, unix, cli)
 	}()

+	signalsCh := make(chan nativeos.Signal, 1)
+	signal.Notify(signalsCh,
+		syscall.SIGINT,
+		syscall.SIGTERM,
+		nativeos.Interrupt,
+	)
+
 	select {
-	case <-signalCtx.Done():
-		stop()
-		fmt.Println("")
-		logger.Warn("Caught OS signal, shutting down")
-		cancel()
+	case signal := <-signalsCh:
+		logger.Warn("Caught OS signal %s, shutting down", signal)
 	case err := <-errorCh:
-		stop()
 		close(errorCh)
 		if err == nil { // expected exit such as healthcheck
-			os.Exit(0)
+			nativeos.Exit(0)
 		}
-		logger.Error(err.Error())
-		cancel()
+		logger.Error(err)
 	}

+	cancel()
+
 	const shutdownGracePeriod = 5 * time.Second
 	timer := time.NewTimer(shutdownGracePeriod)
 	select {
@@ -119,104 +106,59 @@ func main() {
 		logger.Warn("Shutdown timed out")
 	}

-	os.Exit(1)
+	nativeos.Exit(1)
 }

-var (
-	errCommandUnknown = errors.New("command is unknown")
-)
-
 //nolint:gocognit,gocyclo
-func _main(ctx context.Context, buildInfo models.BuildInformation,
-	args []string, logger logging.ParentLogger, source sources.Source,
-	tun tun.Interface, netLinker netlink.NetLinker, cmder command.RunStarter,
-	cli cli.CLIer) error {
+func _main(background context.Context, buildInfo models.BuildInformation,
+	args []string, logger logging.Logger, os os.OS, osUser user.OSUser, unix unix.Unix,
+	cli cli.CLI) error {
 	if len(args) > 1 { // cli operation
 		switch args[1] {
 		case "healthcheck":
-			return cli.HealthCheck(ctx, source, logger)
+			return cli.HealthCheck(background)
 		case "clientkey":
-			return cli.ClientKey(args[2:])
+			return cli.ClientKey(args[2:], os.OpenFile)
 		case "openvpnconfig":
-			return cli.OpenvpnConfig(logger, source)
+			return cli.OpenvpnConfig(os)
 		case "update":
-			return cli.Update(ctx, args[2:], logger)
-		case "format-servers":
-			return cli.FormatServers(args[2:])
+			return cli.Update(args[2:], os)
 		default:
-			return fmt.Errorf("%w: %s", errCommandUnknown, args[1])
+			return fmt.Errorf("command %q is unknown", args[1])
 		}
 	}
-
-	announcementExp, err := time.Parse(time.RFC3339, "2021-02-15T00:00:00Z")
-	if err != nil {
-		return err
-	}
-	splashSettings := gosplash.Settings{
-		User:         "qdm12",
-		Repository:   "gluetun",
-		Emails:       []string{"quentin.mcgaw@gmail.com"},
-		Version:      buildInfo.Version,
-		Commit:       buildInfo.Commit,
-		BuildDate:    buildInfo.Created,
-		Announcement: "Large settings parsing refactoring merged on 2022-01-06, please report any issue!",
-		AnnounceExp:  announcementExp,
-		// Sponsor information
-		PaypalUser:    "qmcgaw",
-		GithubSponsor: "qdm12",
-	}
-	for _, line := range gosplash.MakeLines(splashSettings) {
-		fmt.Println(line)
-	}
-
-	allSettings, err := source.Read()
-	if err != nil {
-		return err
-	}
-
-	// TODO run this in a loop or in openvpn to reload from file without restarting
-	storageLogger := logger.NewChild(logging.Settings{Prefix: "storage: "})
-	storage, err := storage.New(storageLogger, constants.ServersData)
-	if err != nil {
-		return err
-	}
-
-	allServers := storage.GetServers()
-
-	err = allSettings.Validate(allServers)
-	if err != nil {
-		return err
-	}
-
-	logger.PatchLevel(*allSettings.Log.Level)
-
-	puid, pgid := int(*allSettings.System.PUID), int(*allSettings.System.PGID)
+	ctx, cancel := context.WithCancel(background)
+	defer cancel()

 	const clientTimeout = 15 * time.Second
 	httpClient := &http.Client{Timeout: clientTimeout}
 	// Create configurators
-	alpineConf := alpine.New()
-	ovpnConf := openvpn.New(
-		logger.NewChild(logging.Settings{Prefix: "openvpn configurator: "}),
-		cmder, puid, pgid)
+	alpineConf := alpine.NewConfigurator(os.OpenFile, osUser)
+	ovpnConf := openvpn.NewConfigurator(logger, os, unix)
 	dnsCrypto := dnscrypto.New(httpClient, "", "")
 	const cacertsPath = "/etc/ssl/certs/ca-certificates.crt"
-	dnsConf := unbound.NewConfigurator(nil, cmder, dnsCrypto,
+	dnsConf := unbound.NewConfigurator(logger, os.OpenFile, dnsCrypto,
 		"/etc/unbound", "/usr/sbin/unbound", cacertsPath)
+	routingConf := routing.NewRouting(logger)
+	firewallConf := firewall.NewConfigurator(logger, routingConf, os.OpenFile)
+	streamMerger := command.NewStreamMerger()

-	err = printVersions(ctx, logger, []printVersionElement{
-		{name: "Alpine", getVersion: alpineConf.Version},
-		{name: "OpenVPN 2.4", getVersion: ovpnConf.Version24},
-		{name: "OpenVPN 2.5", getVersion: ovpnConf.Version25},
-		{name: "Unbound", getVersion: dnsConf.Version},
-		{name: "IPtables", getVersion: func(ctx context.Context) (version string, err error) {
-			return firewall.Version(ctx, cmder)
-		}},
+	paramsReader := params.NewReader(logger, os)
+	fmt.Println(gluetunLogging.Splash(buildInfo))
+
+	printVersions(ctx, logger, map[string]func(ctx context.Context) (string, error){
+		"OpenVPN":  ovpnConf.Version,
+		"Unbound":  dnsConf.Version,
+		"IPtables": firewallConf.Version,
 	})
+
+	allSettings, warnings, err := settings.GetAllSettings(paramsReader)
+	for _, warning := range warnings {
+		logger.Warn(warning)
+	}
 	if err != nil {
 		return err
 	}
-
 	logger.Info(allSettings.String())

 	if err := os.MkdirAll("/tmp/gluetun", 0644); err != nil {
@@ -226,39 +168,40 @@ func _main(ctx context.Context, buildInfo models.BuildInformation,
 		return err
 	}

+	// TODO run this in a loop or in openvpn to reload from file without restarting
+	storage := storage.New(logger, os, constants.ServersData)
+	allServers, err := storage.SyncServers(constants.GetAllServers())
+	if err != nil {
+		return err
+	}
+
+	// Should never change
+	puid, pgid := allSettings.System.PUID, allSettings.System.PGID
+
 	const defaultUsername = "nonrootuser"
 	nonRootUsername, err := alpineConf.CreateUser(defaultUsername, puid)
 	if err != nil {
-		return fmt.Errorf("%w: %s", errCreateUser, err)
+		return err
 	}
 	if nonRootUsername != defaultUsername {
-		logger.Info("using existing username " + nonRootUsername + " corresponding to user id " + fmt.Sprint(puid))
+		logger.Info("using existing username %s corresponding to user id %d", nonRootUsername, puid)
 	}
-	// set it for Unbound
-	// TODO remove this when migrating to qdm12/dns v2
-	allSettings.DNS.DoT.Unbound.Username = nonRootUsername
-	allSettings.VPN.OpenVPN.ProcUser = nonRootUsername

 	if err := os.Chown("/etc/unbound", puid, pgid); err != nil {
 		return err
 	}

-	firewallLogLevel := *allSettings.Log.Level
-	if *allSettings.Firewall.Debug {
-		firewallLogLevel = logging.LevelDebug
+	if allSettings.Firewall.Debug {
+		firewallConf.SetDebug()
+		routingConf.SetDebug()
 	}
-	routingLogger := logger.NewChild(logging.Settings{
-		Prefix: "routing: ",
-		Level:  firewallLogLevel,
-	})
-	routingConf := routing.New(netLinker, routingLogger)

 	defaultInterface, defaultGateway, err := routingConf.DefaultRoute()
 	if err != nil {
 		return err
 	}

-	localNetworks, err := routingConf.LocalNetworks()
+	localSubnet, err := routingConf.LocalSubnet()
 	if err != nil {
 		return err
 	}
@@ -268,23 +211,15 @@ func _main(ctx context.Context, buildInfo models.BuildInformation,
 		return err
 	}

-	firewallLogger := logger.NewChild(logging.Settings{
-		Prefix: "firewall: ",
-		Level:  firewallLogLevel,
-	})
-	firewallConf := firewall.NewConfig(firewallLogger, cmder,
-		defaultInterface, defaultGateway, localNetworks, defaultIP)
+	firewallConf.SetNetworkInformation(defaultInterface, defaultGateway, localSubnet, defaultIP)

 	if err := routingConf.Setup(); err != nil {
-		if strings.Contains(err.Error(), "operation not permitted") {
-			logger.Warn("💡 Tip: Are you passing NET_ADMIN capability to gluetun?")
-		}
-		return fmt.Errorf("%w: %s", errSetupRouting, err)
+		return err
 	}
 	defer func() {
-		logger.Info("routing cleanup...")
+		routingConf.SetVerbose(false)
 		if err := routingConf.TearDown(); err != nil {
-			logger.Error("cannot teardown routing: " + err.Error())
+			logger.Error(err)
 		}
 	}()

@@ -295,21 +230,33 @@ func _main(ctx context.Context, buildInfo models.BuildInformation,
 		return err
 	}

-	if err := tun.Check(constants.TunnelDevice); err != nil {
-		logger.Info(err.Error() + "; creating it...")
-		err = tun.Create(constants.TunnelDevice)
+	if err := ovpnConf.CheckTUN(); err != nil {
+		logger.Warn(err)
+		err = ovpnConf.CreateTUN()
 		if err != nil {
 			return err
 		}
 	}

-	if *allSettings.Firewall.Enabled {
+	tunnelReadyCh := make(chan struct{})
+	dnsReadyCh := make(chan struct{})
+	defer close(tunnelReadyCh)
+	defer close(dnsReadyCh)
+
+	if allSettings.Firewall.Enabled {
 		err := firewallConf.SetEnabled(ctx, true) // disabled by default
 		if err != nil {
 			return err
 		}
 	}

+	for _, vpnPort := range allSettings.Firewall.VPNInputPorts {
+		err = firewallConf.SetAllowedPort(ctx, vpnPort, string(constants.TUN))
+		if err != nil {
+			return err
+		}
+	}
+
 	for _, port := range allSettings.Firewall.InputPorts {
 		err = firewallConf.SetAllowedPort(ctx, port, defaultInterface)
 		if err != nil {
@@ -317,149 +264,184 @@ func _main(ctx context.Context, buildInfo models.BuildInformation,
 		}
 	} // TODO move inside firewall?

-	// Shutdown settings
-	const totalShutdownTimeout = 3 * time.Second
-	const defaultShutdownTimeout = 400 * time.Millisecond
-	defaultShutdownOnSuccess := func(goRoutineName string) {
-		logger.Info(goRoutineName + ": terminated ✔️")
-	}
-	defaultShutdownOnFailure := func(goRoutineName string, err error) {
-		logger.Warn(goRoutineName + ": " + err.Error() + " ⚠️")
-	}
-	defaultGroupOptions := []group.Option{
-		group.OptionTimeout(defaultShutdownTimeout),
-		group.OptionOnSuccess(defaultShutdownOnSuccess)}
+	wg := &sync.WaitGroup{}

-	controlGroupHandler := goshutdown.NewGroupHandler("control", defaultGroupOptions...)
-	tickersGroupHandler := goshutdown.NewGroupHandler("tickers", defaultGroupOptions...)
-	otherGroupHandler := goshutdown.NewGroupHandler("other", defaultGroupOptions...)
+	wg.Add(1)
+	go collectStreamLines(ctx, wg, streamMerger, logger, tunnelReadyCh)

-	portForwardLogger := logger.NewChild(logging.Settings{Prefix: "port forwarding: "})
-	portForwardLooper := portforward.NewLoop(allSettings.VPN.Provider.PortForwarding,
-		httpClient, firewallConf, portForwardLogger)
-	portForwardHandler, portForwardCtx, portForwardDone := goshutdown.NewGoRoutineHandler(
-		"port forwarding", goroutine.OptionTimeout(time.Second))
-	go portForwardLooper.Run(portForwardCtx, portForwardDone)
-
-	unboundLogger := logger.NewChild(logging.Settings{Prefix: "dns over tls: "})
-	unboundLooper := dns.NewLoop(dnsConf, allSettings.DNS, httpClient,
-		unboundLogger)
-	dnsHandler, dnsCtx, dnsDone := goshutdown.NewGoRoutineHandler(
-		"unbound", goroutine.OptionTimeout(defaultShutdownTimeout))
-	// wait for unboundLooper.Restart or its ticker launched with RunRestartTicker
-	go unboundLooper.Run(dnsCtx, dnsDone)
-	otherGroupHandler.Add(dnsHandler)
-
-	dnsTickerHandler, dnsTickerCtx, dnsTickerDone := goshutdown.NewGoRoutineHandler(
-		"dns ticker", goroutine.OptionTimeout(defaultShutdownTimeout))
-	go unboundLooper.RunRestartTicker(dnsTickerCtx, dnsTickerDone)
-	controlGroupHandler.Add(dnsTickerHandler)
-
-	publicIPLooper := publicip.NewLoop(httpClient,
-		logger.NewChild(logging.Settings{Prefix: "ip getter: "}),
-		allSettings.PublicIP, puid, pgid)
-	pubIPHandler, pubIPCtx, pubIPDone := goshutdown.NewGoRoutineHandler(
-		"public IP", goroutine.OptionTimeout(defaultShutdownTimeout))
-	go publicIPLooper.Run(pubIPCtx, pubIPDone)
-	otherGroupHandler.Add(pubIPHandler)
-
-	pubIPTickerHandler, pubIPTickerCtx, pubIPTickerDone := goshutdown.NewGoRoutineHandler(
-		"public IP", goroutine.OptionTimeout(defaultShutdownTimeout))
-	go publicIPLooper.RunRestartTicker(pubIPTickerCtx, pubIPTickerDone)
-	tickersGroupHandler.Add(pubIPTickerHandler)
-
-	vpnLogger := logger.NewChild(logging.Settings{Prefix: "vpn: "})
-	vpnLooper := vpn.NewLoop(allSettings.VPN, allSettings.Firewall.VPNInputPorts,
-		allServers, ovpnConf, netLinker, firewallConf, routingConf, portForwardLooper,
-		cmder, publicIPLooper, unboundLooper, vpnLogger, httpClient,
-		buildInfo, *allSettings.Version.Enabled)
-	vpnHandler, vpnCtx, vpnDone := goshutdown.NewGoRoutineHandler(
-		"vpn", goroutine.OptionTimeout(time.Second))
-	go vpnLooper.Run(vpnCtx, vpnDone)
+	openvpnLooper := openvpn.NewLooper(allSettings.OpenVPN, nonRootUsername, puid, pgid, allServers,
+		ovpnConf, firewallConf, routingConf, logger, httpClient, os.OpenFile, streamMerger, cancel)
+	wg.Add(1)
+	// wait for restartOpenvpn
+	go openvpnLooper.Run(ctx, wg)

 	updaterLooper := updater.NewLooper(allSettings.Updater,
-		allServers, storage, vpnLooper.SetServers, httpClient,
-		logger.NewChild(logging.Settings{Prefix: "updater: "}))
-	updaterHandler, updaterCtx, updaterDone := goshutdown.NewGoRoutineHandler(
-		"updater", goroutine.OptionTimeout(defaultShutdownTimeout))
+		allServers, storage, openvpnLooper.SetServers, httpClient, logger)
+	wg.Add(1)
 	// wait for updaterLooper.Restart() or its ticket launched with RunRestartTicker
-	go updaterLooper.Run(updaterCtx, updaterDone)
-	tickersGroupHandler.Add(updaterHandler)
+	go updaterLooper.Run(ctx, wg)

-	updaterTickerHandler, updaterTickerCtx, updaterTickerDone := goshutdown.NewGoRoutineHandler(
-		"updater ticker", goroutine.OptionTimeout(defaultShutdownTimeout))
-	go updaterLooper.RunRestartTicker(updaterTickerCtx, updaterTickerDone)
-	controlGroupHandler.Add(updaterTickerHandler)
+	unboundLooper := dns.NewLooper(dnsConf, allSettings.DNS, httpClient,
+		logger, streamMerger, nonRootUsername, puid, pgid)
+	wg.Add(1)
+	// wait for unboundLooper.Restart or its ticker launched with RunRestartTicker
+	go unboundLooper.Run(ctx, wg, dnsReadyCh)

-	httpProxyLooper := httpproxy.NewLoop(
-		logger.NewChild(logging.Settings{Prefix: "http proxy: "}),
-		allSettings.HTTPProxy)
-	httpProxyHandler, httpProxyCtx, httpProxyDone := goshutdown.NewGoRoutineHandler(
-		"http proxy", goroutine.OptionTimeout(defaultShutdownTimeout))
-	go httpProxyLooper.Run(httpProxyCtx, httpProxyDone)
-	otherGroupHandler.Add(httpProxyHandler)
+	publicIPLooper := publicip.NewLooper(
+		httpClient, logger, allSettings.PublicIP, puid, pgid, os)
+	wg.Add(1)
+	go publicIPLooper.Run(ctx, wg)
+	wg.Add(1)
+	go publicIPLooper.RunRestartTicker(ctx, wg)

-	shadowsocksLooper := shadowsocks.NewLooper(allSettings.Shadowsocks,
-		logger.NewChild(logging.Settings{Prefix: "shadowsocks: "}))
-	shadowsocksHandler, shadowsocksCtx, shadowsocksDone := goshutdown.NewGoRoutineHandler(
-		"shadowsocks proxy", goroutine.OptionTimeout(defaultShutdownTimeout))
-	go shadowsocksLooper.Run(shadowsocksCtx, shadowsocksDone)
-	otherGroupHandler.Add(shadowsocksHandler)
+	httpProxyLooper := httpproxy.NewLooper(logger, allSettings.HTTPProxy)
+	wg.Add(1)
+	go httpProxyLooper.Run(ctx, wg)

-	controlServerAddress := fmt.Sprintf(":%d", *allSettings.ControlServer.Port)
-	controlServerLogging := *allSettings.ControlServer.Log
-	httpServerHandler, httpServerCtx, httpServerDone := goshutdown.NewGoRoutineHandler(
-		"http server", goroutine.OptionTimeout(defaultShutdownTimeout))
-	httpServer := server.New(httpServerCtx, controlServerAddress, controlServerLogging,
-		logger.NewChild(logging.Settings{Prefix: "http server: "}),
-		buildInfo, vpnLooper, portForwardLooper, unboundLooper, updaterLooper, publicIPLooper)
-	go httpServer.Run(httpServerCtx, httpServerDone)
-	controlGroupHandler.Add(httpServerHandler)
+	shadowsocksLooper := shadowsocks.NewLooper(allSettings.ShadowSocks, logger)
+	wg.Add(1)
+	go shadowsocksLooper.Run(ctx, wg)

-	healthLogger := logger.NewChild(logging.Settings{Prefix: "healthcheck: "})
-	healthcheckServer := healthcheck.NewServer(allSettings.Health, healthLogger, vpnLooper)
-	healthServerHandler, healthServerCtx, healthServerDone := goshutdown.NewGoRoutineHandler(
-		"HTTP health server", goroutine.OptionTimeout(defaultShutdownTimeout))
-	go healthcheckServer.Run(healthServerCtx, healthServerDone)
+	wg.Add(1)
+	go routeReadyEvents(ctx, wg, buildInfo, tunnelReadyCh, dnsReadyCh,
+		unboundLooper, updaterLooper, publicIPLooper, routingConf, logger, httpClient,
+		allSettings.VersionInformation, allSettings.OpenVPN.Provider.PortForwarding.Enabled, openvpnLooper.PortForward,
+	)
+	controlServerAddress := fmt.Sprintf("0.0.0.0:%d", allSettings.ControlServer.Port)
+	controlServerLogging := allSettings.ControlServer.Log
+	httpServer := server.New(controlServerAddress, controlServerLogging,
+		logger, buildInfo, openvpnLooper, unboundLooper, updaterLooper, publicIPLooper)
+	wg.Add(1)
+	go httpServer.Run(ctx, wg)

-	orderHandler := goshutdown.NewOrderHandler("gluetun",
-		order.OptionTimeout(totalShutdownTimeout),
-		order.OptionOnSuccess(defaultShutdownOnSuccess),
-		order.OptionOnFailure(defaultShutdownOnFailure))
-	orderHandler.Append(controlGroupHandler, tickersGroupHandler, healthServerHandler,
-		vpnHandler, portForwardHandler, otherGroupHandler)
+	healthcheckServer := healthcheck.NewServer(
+		constants.HealthcheckAddress, logger)
+	wg.Add(1)
+	go healthcheckServer.Run(ctx, wg)

-	// Start VPN for the first time in a blocking call
-	// until the VPN is launched
-	_, _ = vpnLooper.ApplyStatus(ctx, constants.Running) // TODO option to disable with variable
+	// Start openvpn for the first time in a blocking call
+	// until openvpn is launched
+	_, _ = openvpnLooper.SetStatus(constants.Running) // TODO option to disable with variable

 	<-ctx.Done()

-	return orderHandler.Shutdown(context.Background())
-}
-
-type printVersionElement struct {
-	name       string
-	getVersion func(ctx context.Context) (version string, err error)
-}
-
-type infoer interface {
-	Info(s string)
-}
-
-func printVersions(ctx context.Context, logger infoer,
-	elements []printVersionElement) (err error) {
-	const timeout = 5 * time.Second
-	ctx, cancel := context.WithTimeout(ctx, timeout)
-	defer cancel()
-
-	for _, element := range elements {
-		version, err := element.getVersion(ctx)
-		if err != nil {
-			return err
+	if allSettings.OpenVPN.Provider.PortForwarding.Enabled {
+		logger.Info("Clearing forwarded port status file %s", allSettings.OpenVPN.Provider.PortForwarding.Filepath)
+		if err := os.Remove(string(allSettings.OpenVPN.Provider.PortForwarding.Filepath)); err != nil {
+			logger.Error(err)
 		}
-		logger.Info(element.name + " version: " + version)
 	}

+	wg.Wait()
+
 	return nil
 }
+
+func printVersions(ctx context.Context, logger logging.Logger,
+	versionFunctions map[string]func(ctx context.Context) (string, error)) {
+	const timeout = 5 * time.Second
+	ctx, cancel := context.WithTimeout(ctx, timeout)
+	defer cancel()
+	for name, f := range versionFunctions {
+		version, err := f(ctx)
+		if err != nil {
+			logger.Error(err)
+		} else {
+			logger.Info("%s version: %s", name, version)
+		}
+	}
+}
+
+func collectStreamLines(ctx context.Context, wg *sync.WaitGroup,
+	streamMerger command.StreamMerger,
+	logger logging.Logger, tunnelReadyCh chan<- struct{}) {
+	defer wg.Done()
+	// Blocking line merging paramsReader for openvpn and unbound
+	logger.Info("Launching standard output merger")
+	streamMerger.CollectLines(ctx, func(line string) {
+		line, level := gluetunLogging.PostProcessLine(line)
+		if line == "" {
+			return
+		}
+		switch level {
+		case logging.DebugLevel:
+			logger.Debug(line)
+		case logging.InfoLevel:
+			logger.Info(line)
+		case logging.WarnLevel:
+			logger.Warn(line)
+		case logging.ErrorLevel:
+			logger.Error(line)
+		}
+		switch {
+		case strings.Contains(line, "Initialization Sequence Completed"):
+			tunnelReadyCh <- struct{}{}
+		case strings.Contains(line, "TLS Error: TLS key negotiation failed to occur within 60 seconds (check your network connectivity)"): //nolint:lll
+			logger.Warn("This means that either...")
+			logger.Warn("1. The VPN server IP address you are trying to connect to is no longer valid, see https://github.com/qdm12/gluetun/wiki/Update-servers-information") //nolint:lll
+			logger.Warn("2. The VPN server crashed, try changing region")
+			logger.Warn("3. Your Internet connection is not working, ensure it works")
+			logger.Warn("Feel free to create an issue at https://github.com/qdm12/gluetun/issues/new/choose")
+		}
+	}, func(err error) {
+		logger.Warn(err)
+	})
+}
+
+func routeReadyEvents(ctx context.Context, wg *sync.WaitGroup, buildInfo models.BuildInformation,
+	tunnelReadyCh, dnsReadyCh <-chan struct{},
+	unboundLooper dns.Looper, updaterLooper updater.Looper, publicIPLooper publicip.Looper,
+	routing routing.Routing, logger logging.Logger, httpClient *http.Client,
+	versionInformation, portForwardingEnabled bool, startPortForward func(vpnGateway net.IP)) {
+	defer wg.Done()
+	tickerWg := &sync.WaitGroup{}
+	// for linters only
+	var restartTickerContext context.Context
+	var restartTickerCancel context.CancelFunc = func() {}
+	for {
+		select {
+		case <-ctx.Done():
+			restartTickerCancel() // for linters only
+			tickerWg.Wait()
+			return
+		case <-tunnelReadyCh: // blocks until openvpn is connected
+			if unboundLooper.GetSettings().Enabled {
+				_, _ = unboundLooper.SetStatus(constants.Running)
+			}
+			restartTickerCancel() // stop previous restart tickers
+			tickerWg.Wait()
+			restartTickerContext, restartTickerCancel = context.WithCancel(ctx)
+			//nolint:gomnd
+			tickerWg.Add(2)
+			go unboundLooper.RunRestartTicker(restartTickerContext, tickerWg)
+			go updaterLooper.RunRestartTicker(restartTickerContext, tickerWg)
+			vpnDestination, err := routing.VPNDestinationIP()
+			if err != nil {
+				logger.Warn(err)
+			} else {
+				logger.Info("VPN routing IP address: %s", vpnDestination)
+			}
+			if portForwardingEnabled {
+				// vpnGateway required only for PIA
+				vpnGateway, err := routing.VPNLocalGatewayIP()
+				if err != nil {
+					logger.Error(err)
+				}
+				logger.Info("VPN gateway IP address: %s", vpnGateway)
+				startPortForward(vpnGateway)
+			}
+		case <-dnsReadyCh:
+			// Runs the Public IP getter job once
+			_, _ = publicIPLooper.SetStatus(constants.Running)
+			if !versionInformation {
+				break
+			}
+			message, err := versionpkg.GetMessage(ctx, buildInfo, httpClient)
+			if err != nil {
+				logger.Error(err)
+				break
+			}
+			logger.Info(message)
+		}
+	}
+}
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -0,0 +1,31 @@
+version: "3.7"
+services:
+  gluetun:
+    image: qmcgaw/gluetun
+    container_name: gluetun
+    cap_add:
+      - NET_ADMIN
+    network_mode: bridge
+    ports:
+      - 8888:8888/tcp # HTTP proxy
+      - 8388:8388/tcp # Shadowsocks
+      - 8388:8388/udp # Shadowsocks
+      - 8000:8000/tcp # Built-in HTTP control server
+    # command:
+    volumes:
+      - /yourpath:/gluetun
+    secrets:
+      - openvpn_user
+      - openvpn_password
+    environment:
+      # More variables are available, see the readme table
+      - VPNSP=private internet access
+      # Timezone for accurate logs times
+      - TZ=
+    restart: always
+
+secrets:
+  openvpn_user:
+    file: ./openvpn_user
+  openvpn_password:
+    file: ./openvpn_password
--- a/go.mod
+++ b/go.mod
@@ -1,46 +1,16 @@
 module github.com/qdm12/gluetun

-go 1.17
+go 1.15

 require (
-	github.com/breml/rootcerts v0.2.1
-	github.com/fatih/color v1.13.0
-	github.com/go-ping/ping v0.0.0-20210911151512-381826476871
-	github.com/golang/mock v1.6.0
-	github.com/qdm12/dns v1.11.0
-	github.com/qdm12/golibs v0.0.0-20210822203818-5c568b0777b6
-	github.com/qdm12/goshutdown v0.3.0
-	github.com/qdm12/gosplash v0.1.0
-	github.com/qdm12/gotree v0.2.0
-	github.com/qdm12/govalid v0.1.0
-	github.com/qdm12/ss-server v0.4.0
-	github.com/qdm12/updated v0.0.0-20210603204757-205acfe6937e
+	github.com/fatih/color v1.10.0
+	github.com/golang/mock v1.4.4
+	github.com/kyokomi/emoji v2.2.4+incompatible
+	github.com/qdm12/dns v1.4.0-rc4
+	github.com/qdm12/golibs v0.0.0-20210110211000-0a3a4541ae09
+	github.com/qdm12/ss-server v0.1.0
+	github.com/qdm12/updated v0.0.0-20210102005021-dd457d77f94a
 	github.com/stretchr/testify v1.7.0
-	github.com/vishvananda/netlink v1.1.1-0.20211129163951-9ada19101fc5
-	golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c
-	golang.zx2c4.com/wireguard v0.0.0-20210805125648-3957e9b9dd19
-	golang.zx2c4.com/wireguard/wgctrl v0.0.0-20210803171230-4253848d036c
-	inet.af/netaddr v0.0.0-20210718074554-06ca8145d722
-)
-
-require (
-	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/google/go-cmp v0.5.5 // indirect
-	github.com/google/uuid v1.2.0 // indirect
-	github.com/josharian/native v0.0.0-20200817173448-b6b71def0850 // indirect
-	github.com/mattn/go-colorable v0.1.9 // indirect
-	github.com/mattn/go-isatty v0.0.14 // indirect
-	github.com/mdlayher/genetlink v1.0.0 // indirect
-	github.com/mdlayher/netlink v1.4.0 // indirect
-	github.com/miekg/dns v1.1.40 // indirect
-	github.com/mr-tron/base58 v1.2.0 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/riobard/go-bloom v0.0.0-20200614022211-cdc8013cb5b3 // indirect
-	github.com/vishvananda/netns v0.0.0-20200728191858-db3c7e526aae // indirect
-	go4.org/intern v0.0.0-20210108033219-3eb7198706b2 // indirect
-	go4.org/unsafe/assume-no-moving-gc v0.0.0-20201222180813-1025295fd063 // indirect
-	golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97 // indirect
-	golang.org/x/net v0.0.0-20210504132125-bbd867fde50d // indirect
-	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
-	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
+	github.com/vishvananda/netlink v1.1.0
+	golang.org/x/sys v0.0.0-20201223074533-0d417f636930
 )
--- a/go.sum
+++ b/go.sum
@@ -1,249 +1,183 @@
+github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/PuerkitoBio/purell v1.1.0 h1:rmGxhojJlM0tuKtfdvliR84CFHljx9ag64t2xmVkjK4=
 github.com/PuerkitoBio/purell v1.1.0/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
+github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 h1:d+Bc7a5rLufV/sSk/8dngufqelfh6jnri85riMAaF/M=
 github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
 github.com/alcortesm/tgz v0.0.0-20161220082320-9c5fe88206d7/go.mod h1:6zEj6s6u/ghQa61ZWa/C2Aw3RkjiTBOix7dkqa1VLIs=
 github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239/go.mod h1:2FmKhYUyUczH0OGQWaF5ceTx0UBShxjsH6f8oGKYe2c=
 github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5/go.mod h1:wHh0iHkYZB8zMSxRWpUBQtwG5a7fFgvEO+odwuTv2gs=
+github.com/asaskevich/govalidator v0.0.0-20180720115003-f9ffefc3facf h1:eg0MeVzsP1G42dRafH3vf+al2vQIJU0YHX+1Tw87oco=
 github.com/asaskevich/govalidator v0.0.0-20180720115003-f9ffefc3facf/go.mod h1:lB+ZfQJz7igIIfQNfa7Ml4HSf2uFQQRzpGGRXenZAgY=
-github.com/breml/rootcerts v0.2.1 h1:GZMVDXOs945764NFck0vtHSjktKYubOFM0kjf5HAuwc=
-github.com/breml/rootcerts v0.2.1/go.mod h1:24FDtzYMpqIeYC7QzaE8VPRQaFZU5TIUDlyk8qwjD88=
 github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/docker/go-units v0.3.3/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
-github.com/dvyukov/go-fuzz v0.0.0-20210103155950-6a8e9d1f2415/go.mod h1:11Gm+ccJnvAhCNLlf5+cS9KjtbaD5I5zaZpFMsTHWTw=
 github.com/emirpasic/gods v1.12.0/go.mod h1:YfzfFFoVP/catgzJb4IKIqXjX78Ha8FMSDh3ymbK86o=
-github.com/fatih/color v1.12.0/go.mod h1:ELkj/draVOlAH/xkhN6mQ50Qd0MPOk5AAr3maGEBuJM=
-github.com/fatih/color v1.13.0 h1:8LOYc1KYPPmyKMuN8QV2DNRWNbLo6LZ0iLs8+mlH53w=
-github.com/fatih/color v1.13.0/go.mod h1:kLAiJbzzSOZDVNGyDpeOxJ47H46qBXwg5ILebYFFOfk=
+github.com/fatih/color v1.9.0 h1:8xPHl4/q1VyqGIPif1F+1V3Y3lSmrq01EabUW3CoW5s=
+github.com/fatih/color v1.9.0/go.mod h1:eQcE1qtQxscV5RaZvpXrrb8Drkc3/DdQ+uUYCNjL+zU=
+github.com/fatih/color v1.10.0 h1:s36xzo75JdqLaaWoiEHk767eHiwo0598uUxyfiPkDsg=
+github.com/fatih/color v1.10.0/go.mod h1:ELkj/draVOlAH/xkhN6mQ50Qd0MPOk5AAr3maGEBuJM=
 github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568/go.mod h1:xEzjJPgXI435gkrCt3MPfRiAkVrwSbHsst4LCFVfpJc=
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-golang.org/x/sys v0.0.0-20201009025420-dfb3f7c4e634/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20201118182958-a01c418693c7/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20201218084310-7d0127a74742/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210110051926-789bb1bd4061/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210123111255-9b0068b26619/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210216163648-f7da38b97c65/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210309040221-94ec62e08169/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210315160823-c6e025ad8005/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210403161142-5e06dd20ab57/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210503173754-0981d6026fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c h1:F1jZWGFhYfh0Ci55sIpILtKKK8p3i2/krTr0H1rg74I=
-golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20201223074533-0d417f636930 h1:vRgIt+nup/B/BwIS0g2oC0haq0iqbV3ZA+u6+0TlNCo=
+golang.org/x/sys v0.0.0-20201223074533-0d417f636930/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
-golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
-golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
+golang.org/x/tools v0.0.0-20190425150028-36563e24a262/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
+golang.org/x/tools v0.0.0-20190621195816-6e04913cbbac/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
 golang.org/x/tools v0.0.0-20190729092621-ff9f1409240a/go.mod h1:jcCCGcm9btYwXyDqrUWc6MKQKKGJCWEQ3AfLSRIbEuI=
-golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
-golang.org/x/tools v0.0.0-20191216052735-49a3e744a425/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
-golang.org/x/tools v0.1.0/go.mod h1:xkSsbof2nBLbhDlRMhhhyNLN/zl3eTqcnHD5viDpcZ0=
-golang.org/x/tools v0.1.1/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
+golang.org/x/tools v0.0.0-20191029041327-9cc4af7d6b2c/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20191029190741-b9c20aec41a5 h1:hKsoRgsbwY1NafxrwTs+k64bikrLBkAgPir1TNCj3Zs=
+golang.org/x/tools v0.0.0-20191029190741-b9c20aec41a5/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.zx2c4.com/wireguard v0.0.0-20210427022245-097af6e1351b/go.mod h1:a057zjmoc00UN7gVkaJt2sXVK523kMJcogDTEvPIasg=
-golang.zx2c4.com/wireguard v0.0.0-20210805125648-3957e9b9dd19 h1:ab2jcw2W91Rz07eHAb8Lic7sFQKO0NhBftjv6m/gL/0=
-golang.zx2c4.com/wireguard v0.0.0-20210805125648-3957e9b9dd19/go.mod h1:laHzsbfMhGSobUmruXWAyMKKHSqvIcrqZJMyHD+/3O8=
-golang.zx2c4.com/wireguard/wgctrl v0.0.0-20210803171230-4253848d036c h1:ADNrRDI5NR23/TUCnEmlLZLt4u9DnZ2nwRkPrAcFvto=
-golang.zx2c4.com/wireguard/wgctrl v0.0.0-20210803171230-4253848d036c/go.mod h1:+1XihzyZUBJcSc5WO9SwNA7v26puQwOEDwanaxfNXPQ=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/src-d/go-billy.v4 v4.3.2/go.mod h1:nDjArDMp+XMs1aFAESLRjfGSgfvoYN0hDfzEk0GjC98=
 gopkg.in/src-d/go-git-fixtures.v3 v3.5.0/go.mod h1:dLBcvytrw/TYZsNTWCnkNF2DSIlzWYqTe3rJR56Ac7g=
 gopkg.in/src-d/go-git.v4 v4.13.1/go.mod h1:nx5NYcxdKxq5fpltdHnPa2Exj4Sx0EclMWZQbYDu2z8=
@@ -252,6 +186,7 @@ gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-inet.af/netaddr v0.0.0-20210511181906-37180328850c/go.mod h1:z0nx+Dh+7N7CC8V5ayHtHGpZpxLQZZxkIaaz6HN65Ls=
-inet.af/netaddr v0.0.0-20210718074554-06ca8145d722 h1:Qws2rZnQudC58cIagVucPQDLmMi3kAXgxscsgD0v6DU=
-inet.af/netaddr v0.0.0-20210718074554-06ca8145d722/go.mod h1:z0nx+Dh+7N7CC8V5ayHtHGpZpxLQZZxkIaaz6HN65Ls=
+honnef.co/go/tools v0.0.1-2019.2.3 h1:3JgtbtFHMiCmsznwGVTUWbgGov+pVqnlf1dEJTNAXeM=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
--- a/internal/alpine/alpine.go
+++ b/internal/alpine/alpine.go
@@ -1,29 +1,22 @@
-// Package alpine defines a configurator to interact with the Alpine operating system.
 package alpine

 import (
-	"os/user"
+	"github.com/qdm12/golibs/os"
+	"github.com/qdm12/golibs/os/user"
 )

-var _ Alpiner = (*Alpine)(nil)
-
-type Alpiner interface {
-	UserCreater
-	VersionGetter
+type Configurator interface {
+	CreateUser(username string, uid int) (createdUsername string, err error)
 }

-type Alpine struct {
-	alpineReleasePath string
-	passwdPath        string
-	lookupID          func(uid string) (*user.User, error)
-	lookup            func(username string) (*user.User, error)
+type configurator struct {
+	openFile os.OpenFileFunc
+	osUser   user.OSUser
 }

-func New() *Alpine {
-	return &Alpine{
-		alpineReleasePath: "/etc/alpine-release",
-		passwdPath:        "/etc/passwd",
-		lookupID:          user.LookupId,
-		lookup:            user.Lookup,
+func NewConfigurator(openFile os.OpenFileFunc, osUser user.OSUser) Configurator {
+	return &configurator{
+		openFile: openFile,
+		osUser:   osUser,
 	}
 }
--- a/internal/alpine/users.go
+++ b/internal/alpine/users.go
@@ -1,51 +1,35 @@
 package alpine

 import (
-	"errors"
 	"fmt"
 	"os"
 	"os/user"
-	"strconv"
 )

-var (
-	ErrUserAlreadyExists = errors.New("user already exists")
-)
-
-type UserCreater interface {
-	CreateUser(username string, uid int) (createdUsername string, err error)
-}
-
 // CreateUser creates a user in Alpine with the given UID.
-func (a *Alpine) CreateUser(username string, uid int) (createdUsername string, err error) {
-	UIDStr := strconv.Itoa(uid)
-	u, err := a.lookupID(UIDStr)
+func (c *configurator) CreateUser(username string, uid int) (createdUsername string, err error) {
+	UIDStr := fmt.Sprintf("%d", uid)
+	u, err := c.osUser.LookupID(UIDStr)
 	_, unknownUID := err.(user.UnknownUserIdError)
 	if err != nil && !unknownUID {
-		return "", err
-	}
-
-	if u != nil {
+		return "", fmt.Errorf("cannot create user: %w", err)
+	} else if u != nil {
 		if u.Username == username {
 			return "", nil
 		}
 		return u.Username, nil
 	}
-
-	u, err = a.lookup(username)
+	u, err = c.osUser.Lookup(username)
 	_, unknownUsername := err.(user.UnknownUserError)
 	if err != nil && !unknownUsername {
-		return "", err
+		return "", fmt.Errorf("cannot create user: %w", err)
+	} else if u != nil {
+		return "", fmt.Errorf("cannot create user: user with name %s already exists for ID %s instead of %d",
+			username, u.Uid, uid)
 	}
-
-	if u != nil {
-		return "", fmt.Errorf("%w: with name %s for ID %s instead of %d",
-			ErrUserAlreadyExists, username, u.Uid, uid)
-	}
-
-	file, err := os.OpenFile(a.passwdPath, os.O_APPEND|os.O_WRONLY, 0644)
+	file, err := c.openFile("/etc/passwd", os.O_APPEND|os.O_WRONLY, 0644)
 	if err != nil {
-		return "", err
+		return "", fmt.Errorf("cannot create user: %w", err)
 	}
 	s := fmt.Sprintf("%s:x:%d:::/dev/null:/sbin/nologin\n", username, uid)
 	_, err = file.WriteString(s)
@@ -53,6 +37,5 @@ func (a *Alpine) CreateUser(username string, uid int) (createdUsername string, e
 		_ = file.Close()
 		return "", err
 	}
-
 	return username, file.Close()
 }
--- a/internal/alpine/version.go
+++ b/internal/alpine/version.go
@@ -1,31 +0,0 @@
-package alpine
-
-import (
-	"context"
-	"io"
-	"os"
-	"strings"
-)
-
-type VersionGetter interface {
-	Version(ctx context.Context) (version string, err error)
-}
-
-func (a *Alpine) Version(ctx context.Context) (version string, err error) {
-	file, err := os.OpenFile(a.alpineReleasePath, os.O_RDONLY, 0)
-	if err != nil {
-		return "", err
-	}
-
-	b, err := io.ReadAll(file)
-	if err != nil {
-		return "", err
-	}
-
-	if err := file.Close(); err != nil {
-		return "", err
-	}
-
-	version = strings.ReplaceAll(string(b), "\n", "")
-	return version, nil
-}
--- a/internal/cli/ci.go
+++ b/internal/cli/ci.go
@@ -2,6 +2,6 @@ package cli

 import "context"

-func (c *CLI) CI(context context.Context) error {
+func (c *cli) CI(context context.Context) error {
 	return nil
 }
--- a/internal/cli/cli.go
+++ b/internal/cli/cli.go
@@ -1,22 +1,20 @@
-// Package cli defines an interface CLI to run command line operations.
 package cli

-var _ CLIer = (*CLI)(nil)
+import (
+	"context"

-type CLIer interface {
-	ClientKeyFormatter
-	HealthChecker
-	OpenvpnConfigMaker
-	Updater
-	ServersFormatter
+	"github.com/qdm12/golibs/os"
+)
+
+type CLI interface {
+	ClientKey(args []string, openFile os.OpenFileFunc) error
+	HealthCheck(ctx context.Context) error
+	OpenvpnConfig(os os.OS) error
+	Update(args []string, os os.OS) error
 }

-type CLI struct {
-	repoServersPath string
-}
+type cli struct{}

-func New() *CLI {
-	return &CLI{
-		repoServersPath: "./internal/storage/servers.json",
-	}
+func New() CLI {
+	return &cli{}
 }
--- a/internal/cli/clientkey.go
+++ b/internal/cli/clientkey.go
@@ -3,28 +3,24 @@ package cli
 import (
 	"flag"
 	"fmt"
-	"io"
-	"os"
+	"io/ioutil"
 	"strings"

 	"github.com/qdm12/gluetun/internal/constants"
+	"github.com/qdm12/golibs/os"
 )

-type ClientKeyFormatter interface {
-	ClientKey(args []string) error
-}
-
-func (c *CLI) ClientKey(args []string) error {
+func (c *cli) ClientKey(args []string, openFile os.OpenFileFunc) error {
 	flagSet := flag.NewFlagSet("clientkey", flag.ExitOnError)
-	filepath := flagSet.String("path", constants.ClientKey, "file path to the client.key file")
+	filepath := flagSet.String("path", string(constants.ClientKey), "file path to the client.key file")
 	if err := flagSet.Parse(args); err != nil {
 		return err
 	}
-	file, err := os.OpenFile(*filepath, os.O_RDONLY, 0)
+	file, err := openFile(*filepath, os.O_RDONLY, 0)
 	if err != nil {
 		return err
 	}
-	data, err := io.ReadAll(file)
+	data, err := ioutil.ReadAll(file)
 	if err != nil {
 		_ = file.Close()
 		return err
--- a/internal/cli/formatservers.go
+++ b/internal/cli/formatservers.go
@@ -1,133 +0,0 @@
-package cli
-
-import (
-	"errors"
-	"flag"
-	"fmt"
-	"os"
-	"path/filepath"
-
-	"github.com/qdm12/gluetun/internal/constants"
-	"github.com/qdm12/gluetun/internal/storage"
-)
-
-type ServersFormatter interface {
-	FormatServers(args []string) error
-}
-
-var (
-	ErrFormatNotRecognized = errors.New("format is not recognized")
-	ErrProviderUnspecified = errors.New("VPN provider to format was not specified")
-	ErrOpenOutputFile      = errors.New("cannot open output file")
-	ErrWriteOutput         = errors.New("cannot write to output file")
-	ErrCloseOutputFile     = errors.New("cannot close output file")
-)
-
-func (c *CLI) FormatServers(args []string) error {
-	var format, output string
-	var cyberghost, expressvpn, fastestvpn, hideMyAss, ipvanish, ivpn, mullvad,
-		nordvpn, perfectPrivacy, pia, privado, privatevpn, protonvpn, purevpn, surfshark,
-		torguard, vpnUnlimited, vyprvpn, wevpn, windscribe bool
-	flagSet := flag.NewFlagSet("markdown", flag.ExitOnError)
-	flagSet.StringVar(&format, "format", "markdown", "Format to use which can be: 'markdown'")
-	flagSet.StringVar(&output, "output", "/dev/stdout", "Output file to write the formatted data to")
-	flagSet.BoolVar(&cyberghost, "cyberghost", false, "Format Cyberghost servers")
-	flagSet.BoolVar(&expressvpn, "expressvpn", false, "Format ExpressVPN servers")
-	flagSet.BoolVar(&fastestvpn, "fastestvpn", false, "Format FastestVPN servers")
-	flagSet.BoolVar(&hideMyAss, "hidemyass", false, "Format HideMyAss servers")
-	flagSet.BoolVar(&ipvanish, "ipvanish", false, "Format IpVanish servers")
-	flagSet.BoolVar(&ivpn, "ivpn", false, "Format IVPN servers")
-	flagSet.BoolVar(&mullvad, "mullvad", false, "Format Mullvad servers")
-	flagSet.BoolVar(&nordvpn, "nordvpn", false, "Format Nordvpn servers")
-	flagSet.BoolVar(&perfectPrivacy, "perfectprivacy", false, "Format Perfect Privacy servers")
-	flagSet.BoolVar(&pia, "pia", false, "Format Private Internet Access servers")
-	flagSet.BoolVar(&privado, "privado", false, "Format Privado servers")
-	flagSet.BoolVar(&privatevpn, "privatevpn", false, "Format Private VPN servers")
-	flagSet.BoolVar(&protonvpn, "protonvpn", false, "Format Protonvpn servers")
-	flagSet.BoolVar(&purevpn, "purevpn", false, "Format Purevpn servers")
-	flagSet.BoolVar(&surfshark, "surfshark", false, "Format Surfshark servers")
-	flagSet.BoolVar(&torguard, "torguard", false, "Format Torguard servers")
-	flagSet.BoolVar(&vpnUnlimited, "vpnunlimited", false, "Format VPN Unlimited servers")
-	flagSet.BoolVar(&vyprvpn, "vyprvpn", false, "Format Vyprvpn servers")
-	flagSet.BoolVar(&wevpn, "wevpn", false, "Format WeVPN servers")
-	flagSet.BoolVar(&windscribe, "windscribe", false, "Format Windscribe servers")
-	if err := flagSet.Parse(args); err != nil {
-		return err
-	}
-
-	if format != "markdown" {
-		return fmt.Errorf("%w: %s", ErrFormatNotRecognized, format)
-	}
-
-	logger := newNoopLogger()
-	storage, err := storage.New(logger, constants.ServersData)
-	if err != nil {
-		return fmt.Errorf("%w: %s", ErrNewStorage, err)
-	}
-	currentServers := storage.GetServers()
-
-	var formatted string
-	switch {
-	case cyberghost:
-		formatted = currentServers.Cyberghost.ToMarkdown()
-	case expressvpn:
-		formatted = currentServers.Expressvpn.ToMarkdown()
-	case fastestvpn:
-		formatted = currentServers.Fastestvpn.ToMarkdown()
-	case hideMyAss:
-		formatted = currentServers.HideMyAss.ToMarkdown()
-	case ipvanish:
-		formatted = currentServers.Ipvanish.ToMarkdown()
-	case ivpn:
-		formatted = currentServers.Ivpn.ToMarkdown()
-	case mullvad:
-		formatted = currentServers.Mullvad.ToMarkdown()
-	case nordvpn:
-		formatted = currentServers.Nordvpn.ToMarkdown()
-	case perfectPrivacy:
-		formatted = currentServers.Perfectprivacy.ToMarkdown()
-	case pia:
-		formatted = currentServers.Pia.ToMarkdown()
-	case privado:
-		formatted = currentServers.Privado.ToMarkdown()
-	case privatevpn:
-		formatted = currentServers.Privatevpn.ToMarkdown()
-	case protonvpn:
-		formatted = currentServers.Protonvpn.ToMarkdown()
-	case purevpn:
-		formatted = currentServers.Purevpn.ToMarkdown()
-	case surfshark:
-		formatted = currentServers.Surfshark.ToMarkdown()
-	case torguard:
-		formatted = currentServers.Torguard.ToMarkdown()
-	case vpnUnlimited:
-		formatted = currentServers.VPNUnlimited.ToMarkdown()
-	case vyprvpn:
-		formatted = currentServers.Vyprvpn.ToMarkdown()
-	case wevpn:
-		formatted = currentServers.Wevpn.ToMarkdown()
-	case windscribe:
-		formatted = currentServers.Windscribe.ToMarkdown()
-	default:
-		return ErrProviderUnspecified
-	}
-
-	output = filepath.Clean(output)
-	file, err := os.OpenFile(output, os.O_TRUNC|os.O_WRONLY|os.O_CREATE, 0644)
-	if err != nil {
-		return fmt.Errorf("%w: %s", ErrOpenOutputFile, err)
-	}
-
-	_, err = fmt.Fprint(file, formatted)
-	if err != nil {
-		_ = file.Close()
-		return fmt.Errorf("%w: %s", ErrWriteOutput, err)
-	}
-
-	err = file.Close()
-	if err != nil {
-		return fmt.Errorf("%w: %s", ErrCloseOutputFile, err)
-	}
-
-	return nil
-}
--- a/internal/cli/healthcheck.go
+++ b/internal/cli/healthcheck.go
@@ -2,41 +2,19 @@ package cli

 import (
 	"context"
-	"net"
 	"net/http"
 	"time"

-	"github.com/qdm12/gluetun/internal/configuration/sources"
+	"github.com/qdm12/gluetun/internal/constants"
 	"github.com/qdm12/gluetun/internal/healthcheck"
 )

-type HealthChecker interface {
-	HealthCheck(ctx context.Context, source sources.Source, warner Warner) error
-}
-
-func (c *CLI) HealthCheck(ctx context.Context, source sources.Source, warner Warner) error {
-	// Extract the health server port from the configuration.
-	config, err := source.ReadHealth()
-	if err != nil {
-		return err
-	}
-
-	err = config.Validate()
-	if err != nil {
-		return err
-	}
-
-	_, port, err := net.SplitHostPort(config.ServerAddress)
-	if err != nil {
-		return err
-	}
-
+func (c *cli) HealthCheck(ctx context.Context) error {
 	const timeout = 10 * time.Second
 	httpClient := &http.Client{Timeout: timeout}
-	client := healthcheck.NewClient(httpClient)
+	healthchecker := healthcheck.NewChecker(httpClient)
 	ctx, cancel := context.WithTimeout(ctx, timeout)
 	defer cancel()
-
-	url := "http://127.0.0.1:" + port
-	return client.Check(ctx, url)
+	const url = "http://" + constants.HealthcheckAddress
+	return healthchecker.Check(ctx, url)
 }
--- a/internal/cli/nooplogger.go
+++ b/internal/cli/nooplogger.go
@@ -1,16 +0,0 @@
-package cli
-
-import "github.com/qdm12/golibs/logging"
-
-type noopLogger struct{}
-
-func newNoopLogger() *noopLogger {
-	return new(noopLogger)
-}
-
-func (l *noopLogger) Debug(s string)                 {}
-func (l *noopLogger) Info(s string)                  {}
-func (l *noopLogger) Warn(s string)                  {}
-func (l *noopLogger) Error(s string)                 {}
-func (l *noopLogger) PatchLevel(level logging.Level) {}
-func (l *noopLogger) PatchPrefix(prefix string)      {}
--- a/internal/cli/openvpnconfig.go
+++ b/internal/cli/openvpnconfig.go
@@ -5,47 +5,36 @@ import (
 	"strings"
 	"time"

-	"github.com/qdm12/gluetun/internal/configuration/sources"
 	"github.com/qdm12/gluetun/internal/constants"
+	"github.com/qdm12/gluetun/internal/params"
 	"github.com/qdm12/gluetun/internal/provider"
+	"github.com/qdm12/gluetun/internal/settings"
 	"github.com/qdm12/gluetun/internal/storage"
+	"github.com/qdm12/golibs/logging"
+	"github.com/qdm12/golibs/os"
 )

-type OpenvpnConfigMaker interface {
-	OpenvpnConfig(logger OpenvpnConfigLogger, source sources.Source) error
-}
-
-type OpenvpnConfigLogger interface {
-	Info(s string)
-	Warn(s string)
-}
-
-func (c *CLI) OpenvpnConfig(logger OpenvpnConfigLogger, source sources.Source) error {
-	storage, err := storage.New(logger, constants.ServersData)
+func (c *cli) OpenvpnConfig(os os.OS) error {
+	logger, err := logging.NewLogger(logging.ConsoleEncoding, logging.InfoLevel)
 	if err != nil {
 		return err
 	}
-	allServers := storage.GetServers()
-
-	allSettings, err := source.Read()
+	paramsReader := params.NewReader(logger, os)
+	allSettings, _, err := settings.GetAllSettings(paramsReader)
 	if err != nil {
 		return err
 	}
-
-	if err = allSettings.Validate(allServers); err != nil {
-		return err
-	}
-
-	providerConf := provider.New(*allSettings.VPN.Provider.Name, allServers, time.Now)
-	connection, err := providerConf.GetConnection(allSettings.VPN.Provider.ServerSelection)
+	allServers, err := storage.New(logger, os, constants.ServersData).
+		SyncServers(constants.GetAllServers())
 	if err != nil {
 		return err
 	}
-	lines, err := providerConf.BuildConf(connection, allSettings.VPN.OpenVPN)
+	providerConf := provider.New(allSettings.OpenVPN.Provider.Name, allServers, time.Now)
+	connection, err := providerConf.GetOpenVPNConnection(allSettings.OpenVPN.Provider.ServerSelection)
 	if err != nil {
 		return err
 	}
-
+	lines := providerConf.BuildConf(connection, "nonroortuser", allSettings.OpenVPN)
 	fmt.Println(strings.Join(lines, "\n"))
 	return nil
 }
--- a/internal/cli/update.go
+++ b/internal/cli/update.go
@@ -2,131 +2,63 @@ package cli

 import (
 	"context"
-	"encoding/json"
-	"errors"
 	"flag"
 	"fmt"
-	"net"
 	"net/http"
-	"os"
-	"strings"
 	"time"

-	"github.com/qdm12/gluetun/internal/configuration/settings"
 	"github.com/qdm12/gluetun/internal/constants"
-	"github.com/qdm12/gluetun/internal/models"
+	"github.com/qdm12/gluetun/internal/settings"
 	"github.com/qdm12/gluetun/internal/storage"
 	"github.com/qdm12/gluetun/internal/updater"
+	"github.com/qdm12/golibs/logging"
+	"github.com/qdm12/golibs/os"
 )

-var (
-	ErrModeUnspecified         = errors.New("at least one of -enduser or -maintainer must be specified")
-	ErrDNSAddress              = errors.New("DNS address is not valid")
-	ErrNoProviderSpecified     = errors.New("no provider was specified")
-	ErrNewStorage              = errors.New("cannot create storage")
-	ErrUpdateServerInformation = errors.New("cannot update server information")
-	ErrWriteToFile             = errors.New("cannot write updated information to file")
-)
-
-type Updater interface {
-	Update(ctx context.Context, args []string, logger UpdaterLogger) error
-}
-
-type UpdaterLogger interface {
-	Info(s string)
-	Warn(s string)
-	Error(s string)
-}
-
-func boolPtr(b bool) *bool { return &b }
-
-func (c *CLI) Update(ctx context.Context, args []string, logger UpdaterLogger) error {
-	options := settings.Updater{CLI: boolPtr(true)}
-	var endUserMode, maintainerMode, updateAll bool
-	var dnsAddress, csvProviders string
+func (c *cli) Update(args []string, os os.OS) error {
+	options := settings.Updater{CLI: true}
+	var flushToFile bool
 	flagSet := flag.NewFlagSet("update", flag.ExitOnError)
-	flagSet.BoolVar(&endUserMode, "enduser", false, "Write results to /gluetun/servers.json (for end users)")
-	flagSet.BoolVar(&maintainerMode, "maintainer", false,
-		"Write results to ./internal/storage/servers.json to modify the program (for maintainers)")
-	flagSet.StringVar(&dnsAddress, "dns", "8.8.8.8", "DNS resolver address to use")
-	flagSet.BoolVar(&updateAll, "all", false, "Update servers for all VPN providers")
-	flagSet.StringVar(&csvProviders, "providers", "", "CSV string of VPN providers to update server data for")
+	flagSet.BoolVar(&flushToFile, "file", false, "Write results to /gluetun/servers.json (for end users)")
+	flagSet.BoolVar(&options.Stdout, "stdout", false, "Write results to console to modify the program (for maintainers)")
+	flagSet.StringVar(&options.DNSAddress, "dns", "1.1.1.1", "DNS resolver address to use")
+	flagSet.BoolVar(&options.Cyberghost, "cyberghost", false, "Update Cyberghost servers")
+	flagSet.BoolVar(&options.Mullvad, "mullvad", false, "Update Mullvad servers")
+	flagSet.BoolVar(&options.Nordvpn, "nordvpn", false, "Update Nordvpn servers")
+	flagSet.BoolVar(&options.PIA, "pia", false, "Update Private Internet Access post-summer 2020 servers")
+	flagSet.BoolVar(&options.Privado, "privado", false, "Update Privado servers")
+	flagSet.BoolVar(&options.Purevpn, "purevpn", false, "Update Purevpn servers")
+	flagSet.BoolVar(&options.Surfshark, "surfshark", false, "Update Surfshark servers")
+	flagSet.BoolVar(&options.Vyprvpn, "vyprvpn", false, "Update Vyprvpn servers")
+	flagSet.BoolVar(&options.Windscribe, "windscribe", false, "Update Windscribe servers")
 	if err := flagSet.Parse(args); err != nil {
 		return err
 	}
-
-	if !endUserMode && !maintainerMode {
-		return ErrModeUnspecified
-	}
-
-	options.DNSAddress = net.ParseIP(dnsAddress)
-	if options.DNSAddress == nil {
-		return fmt.Errorf("%w: %s", ErrDNSAddress, dnsAddress)
-	}
-
-	if updateAll {
-		for _, provider := range constants.AllProviders() {
-			if provider == constants.Custom {
-				continue
-			}
-			options.Providers = append(options.Providers, provider)
-		}
-	} else {
-		if csvProviders == "" {
-			return ErrNoProviderSpecified
-		}
-		options.Providers = strings.Split(csvProviders, ",")
-	}
-
-	options.SetDefaults()
-
-	err := options.Validate()
+	logger, err := logging.NewLogger(logging.ConsoleEncoding, logging.InfoLevel)
 	if err != nil {
-		return fmt.Errorf("options validation failed: %w", err)
+		return err
 	}
-
+	if !flushToFile && !options.Stdout {
+		return fmt.Errorf("at least one of -file or -stdout must be specified")
+	}
+	ctx := context.Background()
 	const clientTimeout = 10 * time.Second
 	httpClient := &http.Client{Timeout: clientTimeout}
-
-	storage, err := storage.New(logger, constants.ServersData)
+	storage := storage.New(logger, os, constants.ServersData)
+	currentServers, err := storage.SyncServers(constants.GetAllServers())
 	if err != nil {
-		return fmt.Errorf("%w: %s", ErrNewStorage, err)
+		return fmt.Errorf("cannot update servers: %w", err)
 	}
-	currentServers := storage.GetServers()
-
 	updater := updater.New(options, httpClient, currentServers, logger)
 	allServers, err := updater.UpdateServers(ctx)
 	if err != nil {
-		return fmt.Errorf("%w: %s", ErrUpdateServerInformation, err)
+		return err
 	}
-
-	if endUserMode {
+	if flushToFile {
 		if err := storage.FlushToFile(allServers); err != nil {
-			return fmt.Errorf("%w: %s", ErrWriteToFile, err)
-		}
-	}
-
-	if maintainerMode {
-		if err := writeToEmbeddedJSON(c.repoServersPath, allServers); err != nil {
-			return fmt.Errorf("%w: %s", ErrWriteToFile, err)
+			return fmt.Errorf("cannot update servers: %w", err)
 		}
 	}

 	return nil
 }
-
-func writeToEmbeddedJSON(repoServersPath string,
-	allServers models.AllServers) error {
-	const perms = 0600
-	f, err := os.OpenFile(repoServersPath,
-		os.O_TRUNC|os.O_WRONLY|os.O_CREATE, perms)
-	if err != nil {
-		return err
-	}
-
-	defer f.Close()
-
-	encoder := json.NewEncoder(f)
-	encoder.SetIndent("", "  ")
-	return encoder.Encode(allServers)
-}
--- a/internal/cli/warner.go
+++ b/internal/cli/warner.go
@@ -1,5 +0,0 @@
-package cli
-
-type Warner interface {
-	Warn(s string)
-}
--- a/internal/configuration/settings/dns.go
+++ b/internal/configuration/settings/dns.go
@@ -1,82 +0,0 @@
-package settings
-
-import (
-	"fmt"
-	"net"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
-	"github.com/qdm12/gotree"
-)
-
-// DNS contains settings to configure DNS.
-type DNS struct {
-	// ServerAddress is the DNS server to use inside
-	// the Go program and for the system.
-	// It defaults to '127.0.0.1' to be used with the
-	// DoT server. It cannot be nil in the internal
-	// state.
-	ServerAddress net.IP
-	// KeepNameserver is true if the Docker DNS server
-	// found in /etc/resolv.conf should be kept.
-	// Note settings this to true will go around the
-	// DoT server blocking.
-	// It defaults to false and cannot be nil in the
-	// internal state.
-	KeepNameserver *bool
-	// DOT contains settings to configure the DoT
-	// server.
-	DoT DoT
-}
-
-func (d DNS) validate() (err error) {
-	err = d.DoT.validate()
-	if err != nil {
-		return fmt.Errorf("failed validating DoT settings: %w", err)
-	}
-
-	return nil
-}
-
-func (d *DNS) Copy() (copied DNS) {
-	return DNS{
-		ServerAddress:  helpers.CopyIP(d.ServerAddress),
-		KeepNameserver: helpers.CopyBoolPtr(d.KeepNameserver),
-		DoT:            d.DoT.copy(),
-	}
-}
-
-// mergeWith merges the other settings into any
-// unset field of the receiver settings object.
-func (d *DNS) mergeWith(other DNS) {
-	d.ServerAddress = helpers.MergeWithIP(d.ServerAddress, other.ServerAddress)
-	d.KeepNameserver = helpers.MergeWithBool(d.KeepNameserver, other.KeepNameserver)
-	d.DoT.mergeWith(other.DoT)
-}
-
-// overrideWith overrides fields of the receiver
-// settings object with any field set in the other
-// settings.
-func (d *DNS) overrideWith(other DNS) {
-	d.ServerAddress = helpers.OverrideWithIP(d.ServerAddress, other.ServerAddress)
-	d.KeepNameserver = helpers.OverrideWithBool(d.KeepNameserver, other.KeepNameserver)
-	d.DoT.overrideWith(other.DoT)
-}
-
-func (d *DNS) setDefaults() {
-	localhost := net.IPv4(127, 0, 0, 1) //nolint:gomnd
-	d.ServerAddress = helpers.DefaultIP(d.ServerAddress, localhost)
-	d.KeepNameserver = helpers.DefaultBool(d.KeepNameserver, false)
-	d.DoT.setDefaults()
-}
-
-func (d DNS) String() string {
-	return d.toLinesNode().String()
-}
-
-func (d DNS) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("DNS settings:")
-	node.Appendf("DNS server address to use: %s", d.ServerAddress)
-	node.Appendf("Keep existing nameserver(s): %s", helpers.BoolPtrToYesNo(d.KeepNameserver))
-	node.AppendNode(d.DoT.toLinesNode())
-	return node
-}
--- a/internal/configuration/settings/dnsblacklist.go
+++ b/internal/configuration/settings/dnsblacklist.go
@@ -1,138 +0,0 @@
-package settings
-
-import (
-	"errors"
-	"fmt"
-	"regexp"
-
-	"github.com/qdm12/dns/pkg/blacklist"
-	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
-	"github.com/qdm12/gotree"
-	"inet.af/netaddr"
-)
-
-// DNSBlacklist is settings for the DNS blacklist building.
-type DNSBlacklist struct {
-	BlockMalicious       *bool
-	BlockAds             *bool
-	BlockSurveillance    *bool
-	AllowedHosts         []string
-	AddBlockedHosts      []string
-	AddBlockedIPs        []netaddr.IP
-	AddBlockedIPPrefixes []netaddr.IPPrefix
-}
-
-func (b *DNSBlacklist) setDefaults() {
-	b.BlockMalicious = helpers.DefaultBool(b.BlockMalicious, true)
-	b.BlockAds = helpers.DefaultBool(b.BlockAds, false)
-	b.BlockSurveillance = helpers.DefaultBool(b.BlockSurveillance, true)
-}
-
-var hostRegex = regexp.MustCompile(`^([a-zA-Z0-9]|[a-zA-Z0-9_][a-zA-Z0-9\-_]{0,61}[a-zA-Z0-9_])(\.([a-zA-Z0-9]|[a-zA-Z0-9_][a-zA-Z0-9\-_]{0,61}[a-zA-Z0-9]))*$`) //nolint:lll
-
-var (
-	ErrAllowedHostNotValid = errors.New("allowed host is not valid")
-	ErrBlockedHostNotValid = errors.New("blocked host is not valid")
-)
-
-func (b DNSBlacklist) validate() (err error) {
-	for _, host := range b.AllowedHosts {
-		if !hostRegex.MatchString(host) {
-			return fmt.Errorf("%w: %s", ErrAllowedHostNotValid, host)
-		}
-	}
-
-	for _, host := range b.AddBlockedHosts {
-		if !hostRegex.MatchString(host) {
-			return fmt.Errorf("%w: %s", ErrBlockedHostNotValid, host)
-		}
-	}
-
-	return nil
-}
-
-func (b DNSBlacklist) copy() (copied DNSBlacklist) {
-	return DNSBlacklist{
-		BlockMalicious:       helpers.CopyBoolPtr(b.BlockMalicious),
-		BlockAds:             helpers.CopyBoolPtr(b.BlockAds),
-		BlockSurveillance:    helpers.CopyBoolPtr(b.BlockSurveillance),
-		AllowedHosts:         helpers.CopyStringSlice(b.AllowedHosts),
-		AddBlockedHosts:      helpers.CopyStringSlice(b.AddBlockedHosts),
-		AddBlockedIPs:        helpers.CopyNetaddrIPsSlice(b.AddBlockedIPs),
-		AddBlockedIPPrefixes: helpers.CopyIPPrefixSlice(b.AddBlockedIPPrefixes),
-	}
-}
-
-func (b *DNSBlacklist) mergeWith(other DNSBlacklist) {
-	b.BlockMalicious = helpers.MergeWithBool(b.BlockMalicious, other.BlockMalicious)
-	b.BlockAds = helpers.MergeWithBool(b.BlockAds, other.BlockAds)
-	b.BlockSurveillance = helpers.MergeWithBool(b.BlockSurveillance, other.BlockSurveillance)
-	b.AllowedHosts = helpers.MergeStringSlices(b.AllowedHosts, other.AllowedHosts)
-	b.AddBlockedHosts = helpers.MergeStringSlices(b.AddBlockedHosts, other.AddBlockedHosts)
-	b.AddBlockedIPs = helpers.MergeNetaddrIPsSlices(b.AddBlockedIPs, other.AddBlockedIPs)
-	b.AddBlockedIPPrefixes = helpers.MergeIPPrefixesSlices(b.AddBlockedIPPrefixes, other.AddBlockedIPPrefixes)
-}
-
-func (b *DNSBlacklist) overrideWith(other DNSBlacklist) {
-	b.BlockMalicious = helpers.OverrideWithBool(b.BlockMalicious, other.BlockMalicious)
-	b.BlockAds = helpers.OverrideWithBool(b.BlockAds, other.BlockAds)
-	b.BlockSurveillance = helpers.OverrideWithBool(b.BlockSurveillance, other.BlockSurveillance)
-	b.AllowedHosts = helpers.OverrideWithStringSlice(b.AllowedHosts, other.AllowedHosts)
-	b.AddBlockedHosts = helpers.OverrideWithStringSlice(b.AddBlockedHosts, other.AddBlockedHosts)
-	b.AddBlockedIPs = helpers.OverrideWithNetaddrIPsSlice(b.AddBlockedIPs, other.AddBlockedIPs)
-	b.AddBlockedIPPrefixes = helpers.OverrideWithIPPrefixesSlice(b.AddBlockedIPPrefixes, other.AddBlockedIPPrefixes)
-}
-
-func (b DNSBlacklist) ToBlacklistFormat() (settings blacklist.BuilderSettings, err error) {
-	return blacklist.BuilderSettings{
-		BlockMalicious:       *b.BlockMalicious,
-		BlockAds:             *b.BlockAds,
-		BlockSurveillance:    *b.BlockSurveillance,
-		AllowedHosts:         b.AllowedHosts,
-		AddBlockedHosts:      b.AddBlockedHosts,
-		AddBlockedIPs:        b.AddBlockedIPs,
-		AddBlockedIPPrefixes: b.AddBlockedIPPrefixes,
-	}, nil
-}
-
-func (b DNSBlacklist) String() string {
-	return b.toLinesNode().String()
-}
-
-func (b DNSBlacklist) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("DNS filtering settings:")
-
-	node.Appendf("Block malicious: %s", helpers.BoolPtrToYesNo(b.BlockMalicious))
-	node.Appendf("Block ads: %s", helpers.BoolPtrToYesNo(b.BlockAds))
-	node.Appendf("Block surveillance: %s", helpers.BoolPtrToYesNo(b.BlockSurveillance))
-
-	if len(b.AllowedHosts) > 0 {
-		allowedHostsNode := node.Appendf("Allowed hosts:")
-		for _, host := range b.AllowedHosts {
-			allowedHostsNode.Appendf(host)
-		}
-	}
-
-	if len(b.AddBlockedHosts) > 0 {
-		blockedHostsNode := node.Appendf("Blocked hosts:")
-		for _, host := range b.AddBlockedHosts {
-			blockedHostsNode.Appendf(host)
-		}
-	}
-
-	if len(b.AddBlockedIPs) > 0 {
-		blockedIPsNode := node.Appendf("Blocked IP addresses:")
-		for _, ip := range b.AddBlockedIPs {
-			blockedIPsNode.Appendf(ip.String())
-		}
-	}
-
-	if len(b.AddBlockedIPPrefixes) > 0 {
-		blockedIPPrefixesNode := node.Appendf("Blocked IP networks:")
-		for _, ipNetwork := range b.AddBlockedIPPrefixes {
-			blockedIPPrefixesNode.Appendf(ipNetwork.String())
-		}
-	}
-
-	return node
-}
--- a/internal/configuration/settings/dot.go
+++ b/internal/configuration/settings/dot.go
@@ -1,113 +0,0 @@
-package settings
-
-import (
-	"errors"
-	"fmt"
-	"time"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
-	"github.com/qdm12/gotree"
-)
-
-// DoT contains settings to configure the DoT server.
-type DoT struct {
-	// Enabled is true if the DoT server should be running
-	// and used. It defaults to true, and cannot be nil
-	// in the internal state.
-	Enabled *bool
-	// UpdatePeriod is the period to update DNS block
-	// lists and cryptographic files for DNSSEC validation.
-	// It can be set to 0 to disable the update.
-	// It defaults to 24h and cannot be nil in
-	// the internal state.
-	UpdatePeriod *time.Duration
-	// Unbound contains settings to configure Unbound.
-	Unbound Unbound
-	// Blacklist contains settings to configure the filter
-	// block lists.
-	Blacklist DNSBlacklist
-}
-
-var (
-	ErrDoTUpdatePeriodTooShort = errors.New("update period is too short")
-)
-
-func (d DoT) validate() (err error) {
-	const minUpdatePeriod = 30 * time.Second
-	if *d.UpdatePeriod != 0 && *d.UpdatePeriod < minUpdatePeriod {
-		return fmt.Errorf("%w: %s must be bigger than %s",
-			ErrDoTUpdatePeriodTooShort, *d.UpdatePeriod, minUpdatePeriod)
-	}
-
-	err = d.Unbound.validate()
-	if err != nil {
-		return err
-	}
-
-	err = d.Blacklist.validate()
-	if err != nil {
-		return err
-	}
-
-	return nil
-}
-
-func (d *DoT) copy() (copied DoT) {
-	return DoT{
-		Enabled:      helpers.CopyBoolPtr(d.Enabled),
-		UpdatePeriod: helpers.CopyDurationPtr(d.UpdatePeriod),
-		Unbound:      d.Unbound.copy(),
-		Blacklist:    d.Blacklist.copy(),
-	}
-}
-
-// mergeWith merges the other settings into any
-// unset field of the receiver settings object.
-func (d *DoT) mergeWith(other DoT) {
-	d.Enabled = helpers.MergeWithBool(d.Enabled, other.Enabled)
-	d.UpdatePeriod = helpers.MergeWithDuration(d.UpdatePeriod, other.UpdatePeriod)
-	d.Unbound.mergeWith(other.Unbound)
-	d.Blacklist.mergeWith(other.Blacklist)
-}
-
-// overrideWith overrides fields of the receiver
-// settings object with any field set in the other
-// settings.
-func (d *DoT) overrideWith(other DoT) {
-	d.Enabled = helpers.OverrideWithBool(d.Enabled, other.Enabled)
-	d.UpdatePeriod = helpers.OverrideWithDuration(d.UpdatePeriod, other.UpdatePeriod)
-	d.Unbound.overrideWith(other.Unbound)
-	d.Blacklist.overrideWith(other.Blacklist)
-}
-
-func (d *DoT) setDefaults() {
-	d.Enabled = helpers.DefaultBool(d.Enabled, true)
-	const defaultUpdatePeriod = 24 * time.Hour
-	d.UpdatePeriod = helpers.DefaultDuration(d.UpdatePeriod, defaultUpdatePeriod)
-	d.Unbound.setDefaults()
-	d.Blacklist.setDefaults()
-}
-
-func (d DoT) String() string {
-	return d.toLinesNode().String()
-}
-
-func (d DoT) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("DNS over TLS settings:")
-
-	node.Appendf("Enabled: %s", helpers.BoolPtrToYesNo(d.Enabled))
-	if !*d.Enabled {
-		return node
-	}
-
-	update := "disabled"
-	if *d.UpdatePeriod > 0 {
-		update = "every " + d.UpdatePeriod.String()
-	}
-	node.Appendf("Update period: %s", update)
-
-	node.AppendNode(d.Unbound.toLinesNode())
-	node.AppendNode(d.Blacklist.toLinesNode())
-
-	return node
-}
--- a/internal/configuration/settings/errors.go
+++ b/internal/configuration/settings/errors.go
@@ -1,51 +0,0 @@
-package settings
-
-import "errors"
-
-var (
-	ErrCityNotValid                    = errors.New("the city specified is not valid")
-	ErrControlServerPrivilegedPort     = errors.New("cannot use privileged port without running as root")
-	ErrCountryNotValid                 = errors.New("the country specified is not valid")
-	ErrFirewallZeroPort                = errors.New("cannot have a zero port to block")
-	ErrHostnameNotValid                = errors.New("the hostname specified is not valid")
-	ErrISPNotValid                     = errors.New("the ISP specified is not valid")
-	ErrNameNotValid                    = errors.New("the server name specified is not valid")
-	ErrOpenVPNClientCertMissing        = errors.New("client certificate is missing")
-	ErrOpenVPNClientCertNotValid       = errors.New("client certificate is not valid")
-	ErrOpenVPNClientKeyMissing         = errors.New("client key is missing")
-	ErrOpenVPNClientKeyNotValid        = errors.New("client key is not valid")
-	ErrOpenVPNConfigFile               = errors.New("custom configuration file error")
-	ErrOpenVPNCustomPortNotAllowed     = errors.New("custom endpoint port is not allowed")
-	ErrOpenVPNEncryptionPresetNotValid = errors.New("PIA encryption preset is not valid")
-	ErrOpenVPNInterfaceNotValid        = errors.New("interface name is not valid")
-	ErrOpenVPNMSSFixIsTooHigh          = errors.New("mssfix option value is too high")
-	ErrOpenVPNPasswordIsEmpty          = errors.New("password is empty")
-	ErrOpenVPNTCPNotSupported          = errors.New("TCP protocol is not supported")
-	ErrOpenVPNUserIsEmpty              = errors.New("user is empty")
-	ErrOpenVPNVerbosityIsOutOfBounds   = errors.New("verbosity value is out of bounds")
-	ErrOpenVPNVersionIsNotValid        = errors.New("version is not valid")
-	ErrPortForwardingEnabled           = errors.New("port forwarding cannot be enabled")
-	ErrPortForwardingFilepathNotValid  = errors.New("port forwarding filepath given is not valid")
-	ErrPublicIPFilepathNotValid        = errors.New("public IP address file path is not valid")
-	ErrPublicIPPeriodTooShort          = errors.New("public IP address check period is too short")
-	ErrRegionNotValid                  = errors.New("the region specified is not valid")
-	ErrServerAddressNotValid           = errors.New("server listening address is not valid")
-	ErrSystemPGIDNotValid              = errors.New("process group id is not valid")
-	ErrSystemPUIDNotValid              = errors.New("process user id is not valid")
-	ErrSystemTimezoneNotValid          = errors.New("timezone is not valid")
-	ErrVPNProviderNameNotValid         = errors.New("VPN provider name is not valid")
-	ErrVPNTypeNotValid                 = errors.New("VPN type is not valid")
-	ErrWireguardEndpointIPNotSet       = errors.New("endpoint IP is not set")
-	ErrWireguardEndpointPortNotAllowed = errors.New("endpoint port is not allowed")
-	ErrWireguardEndpointPortNotSet     = errors.New("endpoint port is not set")
-	ErrWireguardInterfaceAddressNotSet = errors.New("interface address is not set")
-	ErrWireguardInterfaceNotValid      = errors.New("interface name is not valid")
-	ErrWireguardPreSharedKeyNotSet     = errors.New("pre-shared key is not set")
-	ErrWireguardPreSharedKeyNotValid   = errors.New("pre-shared key is not valid")
-	ErrWireguardPrivateKeyNotSet       = errors.New("private key is not set")
-	ErrWireguardPrivateKeyNotValid     = errors.New("private key is not valid")
-	ErrWireguardPublicKeyNotSet        = errors.New("public key is not set")
-	ErrWireguardPublicKeyNotValid      = errors.New("public key is not valid")
-
-	ErrUpdaterPeriodTooSmall = errors.New("VPN server data updater period is too small")
-)
--- a/internal/configuration/settings/firewall.go
+++ b/internal/configuration/settings/firewall.go
@@ -1,117 +0,0 @@
-package settings
-
-import (
-	"fmt"
-	"net"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
-	"github.com/qdm12/gotree"
-)
-
-// Firewall contains settings to customize the firewall operation.
-type Firewall struct {
-	VPNInputPorts   []uint16
-	InputPorts      []uint16
-	OutboundSubnets []net.IPNet
-	Enabled         *bool
-	Debug           *bool
-}
-
-func (f Firewall) validate() (err error) {
-	if hasZeroPort(f.VPNInputPorts) {
-		return fmt.Errorf("VPN input ports: %w", ErrFirewallZeroPort)
-	}
-
-	if hasZeroPort(f.InputPorts) {
-		return fmt.Errorf("input ports: %w", ErrFirewallZeroPort)
-	}
-
-	return nil
-}
-
-func hasZeroPort(ports []uint16) (has bool) {
-	for _, port := range ports {
-		if port == 0 {
-			return true
-		}
-	}
-	return false
-}
-
-func (f *Firewall) copy() (copied Firewall) {
-	return Firewall{
-		VPNInputPorts:   helpers.CopyUint16Slice(f.VPNInputPorts),
-		InputPorts:      helpers.CopyUint16Slice(f.InputPorts),
-		OutboundSubnets: helpers.CopyIPNetSlice(f.OutboundSubnets),
-		Enabled:         helpers.CopyBoolPtr(f.Enabled),
-		Debug:           helpers.CopyBoolPtr(f.Debug),
-	}
-}
-
-// mergeWith merges the other settings into any
-// unset field of the receiver settings object.
-// It merges values of slices together, even if they
-// are set in the receiver settings.
-func (f *Firewall) mergeWith(other Firewall) {
-	f.VPNInputPorts = helpers.MergeUint16Slices(f.VPNInputPorts, other.VPNInputPorts)
-	f.InputPorts = helpers.MergeUint16Slices(f.InputPorts, other.InputPorts)
-	f.OutboundSubnets = helpers.MergeIPNetsSlices(f.OutboundSubnets, other.OutboundSubnets)
-	f.Enabled = helpers.MergeWithBool(f.Enabled, other.Enabled)
-	f.Debug = helpers.MergeWithBool(f.Debug, other.Debug)
-}
-
-// overrideWith overrides fields of the receiver
-// settings object with any field set in the other
-// settings.
-func (f *Firewall) overrideWith(other Firewall) {
-	f.VPNInputPorts = helpers.OverrideWithUint16Slice(f.VPNInputPorts, other.VPNInputPorts)
-	f.InputPorts = helpers.OverrideWithUint16Slice(f.InputPorts, other.InputPorts)
-	f.OutboundSubnets = helpers.OverrideWithIPNetsSlice(f.OutboundSubnets, other.OutboundSubnets)
-	f.Enabled = helpers.OverrideWithBool(f.Enabled, other.Enabled)
-	f.Debug = helpers.OverrideWithBool(f.Debug, other.Debug)
-}
-
-func (f *Firewall) setDefaults() {
-	f.Enabled = helpers.DefaultBool(f.Enabled, true)
-	f.Debug = helpers.DefaultBool(f.Debug, false)
-}
-
-func (f Firewall) String() string {
-	return f.toLinesNode().String()
-}
-
-func (f Firewall) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("Firewall settings:")
-
-	node.Appendf("Enabled: %s", helpers.BoolPtrToYesNo(f.Enabled))
-	if !*f.Enabled {
-		return node
-	}
-
-	if *f.Debug {
-		node.Appendf("Debug mode: on")
-	}
-
-	if len(f.VPNInputPorts) > 0 {
-		vpnInputPortsNode := node.Appendf("VPN input ports:")
-		for _, port := range f.VPNInputPorts {
-			vpnInputPortsNode.Appendf("%d", port)
-		}
-	}
-
-	if len(f.InputPorts) > 0 {
-		inputPortsNode := node.Appendf("Input ports:")
-		for _, port := range f.InputPorts {
-			inputPortsNode.Appendf("%d", port)
-		}
-	}
-
-	if len(f.OutboundSubnets) > 0 {
-		outboundSubnets := node.Appendf("Outbound subnets:")
-		for _, subnet := range f.OutboundSubnets {
-			outboundSubnets.Appendf("%s", subnet)
-		}
-	}
-
-	return node
-}
--- a/internal/configuration/settings/health.go
+++ b/internal/configuration/settings/health.go
@@ -1,83 +0,0 @@
-package settings
-
-import (
-	"fmt"
-	"os"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
-	"github.com/qdm12/gotree"
-	"github.com/qdm12/govalid/address"
-)
-
-// Health contains settings for the healthcheck and health server.
-type Health struct {
-	// ServerAddress is the listening address
-	// for the health check server.
-	// It cannot be the empty string in the internal state.
-	ServerAddress string
-	// AddressToPing is the IP address or domain name to
-	// ping periodically for the health check.
-	// It cannot be the empty string in the internal state.
-	AddressToPing string
-	VPN           HealthyWait
-}
-
-func (h Health) Validate() (err error) {
-	uid := os.Getuid()
-	_, err = address.Validate(h.ServerAddress,
-		address.OptionListening(uid))
-	if err != nil {
-		return fmt.Errorf("%w: %s",
-			ErrServerAddressNotValid, err)
-	}
-
-	err = h.VPN.validate()
-	if err != nil {
-		return fmt.Errorf("health VPN settings validation failed: %w", err)
-	}
-
-	return nil
-}
-
-func (h *Health) copy() (copied Health) {
-	return Health{
-		ServerAddress: h.ServerAddress,
-		AddressToPing: h.AddressToPing,
-		VPN:           h.VPN.copy(),
-	}
-}
-
-// MergeWith merges the other settings into any
-// unset field of the receiver settings object.
-func (h *Health) MergeWith(other Health) {
-	h.ServerAddress = helpers.MergeWithString(h.ServerAddress, other.ServerAddress)
-	h.AddressToPing = helpers.MergeWithString(h.AddressToPing, other.AddressToPing)
-	h.VPN.mergeWith(other.VPN)
-}
-
-// OverrideWith overrides fields of the receiver
-// settings object with any field set in the other
-// settings.
-func (h *Health) OverrideWith(other Health) {
-	h.ServerAddress = helpers.OverrideWithString(h.ServerAddress, other.ServerAddress)
-	h.AddressToPing = helpers.OverrideWithString(h.AddressToPing, other.AddressToPing)
-	h.VPN.overrideWith(other.VPN)
-}
-
-func (h *Health) SetDefaults() {
-	h.ServerAddress = helpers.DefaultString(h.ServerAddress, "127.0.0.1:9999")
-	h.AddressToPing = helpers.DefaultString(h.AddressToPing, "github.com")
-	h.VPN.setDefaults()
-}
-
-func (h Health) String() string {
-	return h.toLinesNode().String()
-}
-
-func (h Health) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("Health settings:")
-	node.Appendf("Server listening address: %s", h.ServerAddress)
-	node.Appendf("Address to ping: %s", h.AddressToPing)
-	node.AppendNode(h.VPN.toLinesNode("VPN"))
-	return node
-}
--- a/internal/configuration/settings/healthywait.go
+++ b/internal/configuration/settings/healthywait.go
@@ -1,66 +0,0 @@
-package settings
-
-import (
-	"time"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
-	"github.com/qdm12/gotree"
-)
-
-type HealthyWait struct {
-	// Initial is the initial duration to wait for the program
-	// to be healthy before taking action.
-	// It cannot be nil in the internal state.
-	Initial *time.Duration
-	// Addition is the duration to add to the Initial duration
-	// after Initial has expired to wait longer for the program
-	// to be healthy.
-	// It cannot be nil in the internal state.
-	Addition *time.Duration
-}
-
-func (h HealthyWait) validate() (err error) {
-	return nil
-}
-
-// mergeWith merges the other settings into any
-// unset field of the receiver settings object.
-func (h *HealthyWait) copy() (copied HealthyWait) {
-	return HealthyWait{
-		Initial:  helpers.CopyDurationPtr(h.Initial),
-		Addition: helpers.CopyDurationPtr(h.Addition),
-	}
-}
-
-// mergeWith merges the other settings into any
-// unset field of the receiver settings object.
-func (h *HealthyWait) mergeWith(other HealthyWait) {
-	h.Initial = helpers.MergeWithDuration(h.Initial, other.Initial)
-	h.Addition = helpers.MergeWithDuration(h.Addition, other.Addition)
-}
-
-// overrideWith overrides fields of the receiver
-// settings object with any field set in the other
-// settings.
-func (h *HealthyWait) overrideWith(other HealthyWait) {
-	h.Initial = helpers.OverrideWithDuration(h.Initial, other.Initial)
-	h.Addition = helpers.OverrideWithDuration(h.Addition, other.Addition)
-}
-
-func (h *HealthyWait) setDefaults() {
-	const initialDurationDefault = 6 * time.Second
-	const additionDurationDefault = 5 * time.Second
-	h.Initial = helpers.DefaultDuration(h.Initial, initialDurationDefault)
-	h.Addition = helpers.DefaultDuration(h.Addition, additionDurationDefault)
-}
-
-func (h HealthyWait) String() string {
-	return h.toLinesNode("Health").String()
-}
-
-func (h HealthyWait) toLinesNode(kind string) (node *gotree.Node) {
-	node = gotree.New(kind + " wait durations:")
-	node.Appendf("Initial duration: %s", *h.Initial)
-	node.Appendf("Additional duration: %s", *h.Addition)
-	return node
-}
--- a/internal/configuration/settings/helpers/belong.go
+++ b/internal/configuration/settings/helpers/belong.go
@@ -1,45 +0,0 @@
-package helpers
-
-import (
-	"errors"
-	"fmt"
-	"strings"
-)
-
-func IsOneOf(value string, choices ...string) (ok bool) {
-	for _, choice := range choices {
-		if value == choice {
-			return true
-		}
-	}
-	return false
-}
-
-var ErrValueNotOneOf = errors.New("value is not one of the possible choices")
-
-func AreAllOneOf(values, choices []string) (err error) {
-	set := make(map[string]struct{}, len(choices))
-	for _, choice := range choices {
-		choice = strings.ToLower(choice)
-		set[choice] = struct{}{}
-	}
-
-	for _, value := range values {
-		_, ok := set[value]
-		if !ok {
-			return fmt.Errorf("%w: value %q, choices available are %s",
-				ErrValueNotOneOf, value, strings.Join(choices, ", "))
-		}
-	}
-
-	return nil
-}
-
-func Uint16IsOneOf(port uint16, choices []uint16) (ok bool) {
-	for _, choice := range choices {
-		if port == choice {
-			return true
-		}
-	}
-	return false
-}
--- a/internal/configuration/settings/helpers/copy.go
+++ b/internal/configuration/settings/helpers/copy.go
@@ -1,190 +0,0 @@
-package helpers
-
-import (
-	"net"
-	"time"
-
-	"github.com/qdm12/golibs/logging"
-	"inet.af/netaddr"
-)
-
-func CopyStringPtr(original *string) (copied *string) {
-	if original == nil {
-		return nil
-	}
-	copied = new(string)
-	*copied = *original
-	return copied
-}
-
-func CopyBoolPtr(original *bool) (copied *bool) {
-	if original == nil {
-		return nil
-	}
-	copied = new(bool)
-	*copied = *original
-	return copied
-}
-
-func CopyUint8Ptr(original *uint8) (copied *uint8) {
-	if original == nil {
-		return nil
-	}
-	copied = new(uint8)
-	*copied = *original
-	return copied
-}
-
-func CopyUint16Ptr(original *uint16) (copied *uint16) {
-	if original == nil {
-		return nil
-	}
-	copied = new(uint16)
-	*copied = *original
-	return copied
-}
-
-func CopyIntPtr(original *int) (copied *int) {
-	if original == nil {
-		return nil
-	}
-	copied = new(int)
-	*copied = *original
-	return copied
-}
-
-func CopyDurationPtr(original *time.Duration) (copied *time.Duration) {
-	if original == nil {
-		return nil
-	}
-	copied = new(time.Duration)
-	*copied = *original
-	return copied
-}
-
-func CopyLogLevelPtr(original *logging.Level) (copied *logging.Level) {
-	if original == nil {
-		return nil
-	}
-	copied = new(logging.Level)
-	*copied = *original
-	return copied
-}
-
-func CopyIP(original net.IP) (copied net.IP) {
-	if original == nil {
-		return nil
-	}
-	copied = make(net.IP, len(original))
-	copy(copied, original)
-	return copied
-}
-
-func CopyIPNet(original net.IPNet) (copied net.IPNet) {
-	if original.IP != nil {
-		copied.IP = make(net.IP, len(original.IP))
-		copy(copied.IP, original.IP)
-	}
-
-	if original.Mask != nil {
-		copied.Mask = make(net.IPMask, len(original.Mask))
-		copy(copied.Mask, original.Mask)
-	}
-
-	return copied
-}
-
-func CopyIPNetPtr(original *net.IPNet) (copied *net.IPNet) {
-	if original == nil {
-		return nil
-	}
-
-	copied = new(net.IPNet)
-	*copied = CopyIPNet(*original)
-	return copied
-}
-
-func CopyNetaddrIP(original netaddr.IP) (copied netaddr.IP) {
-	b, err := original.MarshalBinary()
-	if err != nil {
-		panic(err)
-	}
-
-	err = copied.UnmarshalBinary(b)
-	if err != nil {
-		panic(err)
-	}
-
-	return copied
-}
-
-func CopyIPPrefix(original netaddr.IPPrefix) (copied netaddr.IPPrefix) {
-	b, err := original.MarshalText()
-	if err != nil {
-		panic(err)
-	}
-
-	err = copied.UnmarshalText(b)
-	if err != nil {
-		panic(err)
-	}
-
-	return copied
-}
-
-func CopyStringSlice(original []string) (copied []string) {
-	if original == nil {
-		return nil
-	}
-
-	copied = make([]string, len(original))
-	copy(copied, original)
-	return copied
-}
-
-func CopyUint16Slice(original []uint16) (copied []uint16) {
-	if original == nil {
-		return nil
-	}
-
-	copied = make([]uint16, len(original))
-	copy(copied, original)
-	return copied
-}
-
-func CopyIPNetSlice(original []net.IPNet) (copied []net.IPNet) {
-	if original == nil {
-		return nil
-	}
-
-	copied = make([]net.IPNet, len(original))
-	for i := range original {
-		copied[i] = CopyIPNet(original[i])
-	}
-	return copied
-}
-
-func CopyIPPrefixSlice(original []netaddr.IPPrefix) (copied []netaddr.IPPrefix) {
-	if original == nil {
-		return nil
-	}
-
-	copied = make([]netaddr.IPPrefix, len(original))
-	for i := range original {
-		copied[i] = CopyIPPrefix(original[i])
-	}
-	return copied
-}
-
-func CopyNetaddrIPsSlice(original []netaddr.IP) (copied []netaddr.IP) {
-	if original == nil {
-		return nil
-	}
-
-	copied = make([]netaddr.IP, len(original))
-	for i := range original {
-		copied[i] = CopyNetaddrIP(original[i])
-	}
-
-	return copied
-}
--- a/internal/configuration/settings/helpers/default.go
+++ b/internal/configuration/settings/helpers/default.go
@@ -1,93 +0,0 @@
-package helpers
-
-import (
-	"net"
-	"time"
-
-	"github.com/qdm12/golibs/logging"
-)
-
-func DefaultInt(existing *int, defaultValue int) (
-	result *int) {
-	if existing != nil {
-		return existing
-	}
-	result = new(int)
-	*result = defaultValue
-	return result
-}
-
-func DefaultUint8(existing *uint8, defaultValue uint8) (
-	result *uint8) {
-	if existing != nil {
-		return existing
-	}
-	result = new(uint8)
-	*result = defaultValue
-	return result
-}
-
-func DefaultUint16(existing *uint16, defaultValue uint16) (
-	result *uint16) {
-	if existing != nil {
-		return existing
-	}
-	result = new(uint16)
-	*result = defaultValue
-	return result
-}
-
-func DefaultBool(existing *bool, defaultValue bool) (
-	result *bool) {
-	if existing != nil {
-		return existing
-	}
-	result = new(bool)
-	*result = defaultValue
-	return result
-}
-
-func DefaultString(existing string, defaultValue string) (
-	result string) {
-	if existing != "" {
-		return existing
-	}
-	return defaultValue
-}
-
-func DefaultStringPtr(existing *string, defaultValue string) (result *string) {
-	if existing != nil {
-		return existing
-	}
-	result = new(string)
-	*result = defaultValue
-	return result
-}
-
-func DefaultDuration(existing *time.Duration,
-	defaultValue time.Duration) (result *time.Duration) {
-	if existing != nil {
-		return existing
-	}
-	result = new(time.Duration)
-	*result = defaultValue
-	return result
-}
-
-func DefaultLogLevel(existing *logging.Level,
-	defaultValue logging.Level) (result *logging.Level) {
-	if existing != nil {
-		return existing
-	}
-	result = new(logging.Level)
-	*result = defaultValue
-	return result
-}
-
-func DefaultIP(existing net.IP, defaultValue net.IP) (
-	result net.IP) {
-	if existing != nil {
-		return existing
-	}
-	return defaultValue
-}
--- a/internal/configuration/settings/helpers/files.go
+++ b/internal/configuration/settings/helpers/files.go
@@ -1,31 +0,0 @@
-package helpers
-
-import (
-	"errors"
-	"fmt"
-	"os"
-	"path/filepath"
-)
-
-var (
-	ErrFileDoesNotExist = errors.New("file does not exist")
-	ErrFileRead         = errors.New("cannot read file")
-	ErrFileClose        = errors.New("cannot close file")
-)
-
-func FileExists(path string) (err error) {
-	path = filepath.Clean(path)
-
-	f, err := os.Open(path)
-	if errors.Is(err, os.ErrNotExist) {
-		return fmt.Errorf("%w: %s", ErrFileDoesNotExist, path)
-	} else if err != nil {
-		return fmt.Errorf("%w: %s", ErrFileRead, err)
-	}
-
-	if err := f.Close(); err != nil {
-		return fmt.Errorf("%w: %s", ErrFileClose, err)
-	}
-
-	return nil
-}
--- a/internal/configuration/settings/helpers/merge.go
+++ b/internal/configuration/settings/helpers/merge.go
@@ -1,226 +0,0 @@
-package helpers
-
-import (
-	"net"
-	"time"
-
-	"github.com/qdm12/golibs/logging"
-	"inet.af/netaddr"
-)
-
-func MergeWithBool(existing, other *bool) (result *bool) {
-	if existing != nil {
-		return existing
-	} else if other == nil {
-		return nil
-	}
-	result = new(bool)
-	*result = *other
-	return result
-}
-
-func MergeWithString(existing, other string) (result string) {
-	if existing != "" {
-		return existing
-	}
-	return other
-}
-
-func MergeWithStringPtr(existing, other *string) (result *string) {
-	if existing != nil {
-		return existing
-	} else if other == nil {
-		return nil
-	}
-	result = new(string)
-	*result = *other
-	return result
-}
-
-func MergeWithInt(existing, other *int) (result *int) {
-	if existing != nil {
-		return existing
-	} else if other == nil {
-		return nil
-	}
-	result = new(int)
-	*result = *other
-	return result
-}
-
-func MergeWithUint8(existing, other *uint8) (result *uint8) {
-	if existing != nil {
-		return existing
-	} else if other == nil {
-		return nil
-	}
-	result = new(uint8)
-	*result = *other
-	return result
-}
-
-func MergeWithUint16(existing, other *uint16) (result *uint16) {
-	if existing != nil {
-		return existing
-	} else if other == nil {
-		return nil
-	}
-	result = new(uint16)
-	*result = *other
-	return result
-}
-
-func MergeWithIP(existing, other net.IP) (result net.IP) {
-	if existing != nil {
-		return existing
-	} else if other == nil {
-		return nil
-	}
-	result = make(net.IP, len(other))
-	copy(result, other)
-	return result
-}
-
-func MergeWithDuration(existing, other *time.Duration) (result *time.Duration) {
-	if existing != nil {
-		return existing
-	}
-	return other
-}
-
-func MergeWithLogLevel(existing, other *logging.Level) (result *logging.Level) {
-	if existing != nil {
-		return existing
-	} else if other == nil {
-		return nil
-	}
-	result = new(logging.Level)
-	*result = *other
-	return result
-}
-
-func MergeStringSlices(a, b []string) (result []string) {
-	if a == nil && b == nil {
-		return nil
-	}
-
-	seen := make(map[string]struct{}, len(a)+len(b))
-	result = make([]string, 0, len(a)+len(b))
-	for _, s := range a {
-		if _, ok := seen[s]; ok {
-			continue // duplicate
-		}
-		result = append(result, s)
-		seen[s] = struct{}{}
-	}
-	for _, s := range b {
-		if _, ok := seen[s]; ok {
-			continue // duplicate
-		}
-		result = append(result, s)
-		seen[s] = struct{}{}
-	}
-	return result
-}
-
-func MergeUint16Slices(a, b []uint16) (result []uint16) {
-	if a == nil && b == nil {
-		return nil
-	}
-
-	seen := make(map[uint16]struct{}, len(a)+len(b))
-	result = make([]uint16, 0, len(a)+len(b))
-	for _, n := range a {
-		if _, ok := seen[n]; ok {
-			continue // duplicate
-		}
-		result = append(result, n)
-		seen[n] = struct{}{}
-	}
-	for _, n := range b {
-		if _, ok := seen[n]; ok {
-			continue // duplicate
-		}
-		result = append(result, n)
-		seen[n] = struct{}{}
-	}
-	return result
-}
-
-func MergeIPNetsSlices(a, b []net.IPNet) (result []net.IPNet) {
-	if a == nil && b == nil {
-		return nil
-	}
-
-	seen := make(map[string]struct{}, len(a)+len(b))
-	result = make([]net.IPNet, 0, len(a)+len(b))
-	for _, ipNet := range a {
-		key := ipNet.String()
-		if _, ok := seen[key]; ok {
-			continue // duplicate
-		}
-		result = append(result, ipNet)
-		seen[key] = struct{}{}
-	}
-	for _, ipNet := range b {
-		key := ipNet.String()
-		if _, ok := seen[key]; ok {
-			continue // duplicate
-		}
-		result = append(result, ipNet)
-		seen[key] = struct{}{}
-	}
-	return result
-}
-
-func MergeNetaddrIPsSlices(a, b []netaddr.IP) (result []netaddr.IP) {
-	if a == nil && b == nil {
-		return nil
-	}
-
-	seen := make(map[string]struct{}, len(a)+len(b))
-	result = make([]netaddr.IP, 0, len(a)+len(b))
-	for _, ip := range a {
-		key := ip.String()
-		if _, ok := seen[key]; ok {
-			continue // duplicate
-		}
-		result = append(result, ip)
-		seen[key] = struct{}{}
-	}
-	for _, ip := range b {
-		key := ip.String()
-		if _, ok := seen[key]; ok {
-			continue // duplicate
-		}
-		result = append(result, ip)
-		seen[key] = struct{}{}
-	}
-	return result
-}
-
-func MergeIPPrefixesSlices(a, b []netaddr.IPPrefix) (result []netaddr.IPPrefix) {
-	if a == nil && b == nil {
-		return nil
-	}
-
-	seen := make(map[string]struct{}, len(a)+len(b))
-	result = make([]netaddr.IPPrefix, 0, len(a)+len(b))
-	for _, ipPrefix := range a {
-		key := ipPrefix.String()
-		if _, ok := seen[key]; ok {
-			continue // duplicate
-		}
-		result = append(result, ipPrefix)
-		seen[key] = struct{}{}
-	}
-	for _, ipPrefix := range b {
-		key := ipPrefix.String()
-		if _, ok := seen[key]; ok {
-			continue // duplicate
-		}
-		result = append(result, ipPrefix)
-		seen[key] = struct{}{}
-	}
-	return result
-}
--- a/internal/configuration/settings/helpers/messages.go
+++ b/internal/configuration/settings/helpers/messages.go
@@ -1,29 +0,0 @@
-package helpers
-
-import (
-	"fmt"
-	"strings"
-)
-
-func ChoicesOrString(choices []string) string {
-	return strings.Join(
-		choices[:len(choices)-1], ", ") +
-		" or " + choices[len(choices)-1]
-}
-
-func PortChoicesOrString(ports []uint16) (s string) {
-	switch len(ports) {
-	case 0:
-		return "there is no allowed port"
-	case 1:
-		return "allowed port is " + fmt.Sprint(ports[0])
-	}
-
-	s = "allowed ports are "
-	portStrings := make([]string, len(ports))
-	for i := range ports {
-		portStrings[i] = fmt.Sprint(ports[i])
-	}
-	s += ChoicesOrString(portStrings)
-	return s
-}
--- a/internal/configuration/settings/helpers/obfuscate.go
+++ b/internal/configuration/settings/helpers/obfuscate.go
@@ -1,25 +0,0 @@
-package helpers
-
-func ObfuscateWireguardKey(fullKey string) (obfuscatedKey string) {
-	const minKeyLength = 10
-	if len(fullKey) < minKeyLength {
-		return "(too short)"
-	}
-
-	lastIndex := len(fullKey) - 1
-	return fullKey[0:2] + "..." + fullKey[lastIndex-2:]
-}
-
-func ObfuscatePassword(password string) (obfuscatedPassword string) {
-	if password != "" {
-		return "[set]"
-	}
-	return "[not set]"
-}
-
-func ObfuscateData(data string) (obfuscated string) {
-	if data != "" {
-		return "[set]"
-	}
-	return "[not set]"
-}
--- a/internal/configuration/settings/helpers/override.go
+++ b/internal/configuration/settings/helpers/override.go
@@ -1,133 +0,0 @@
-package helpers
-
-import (
-	"net"
-	"time"
-
-	"github.com/qdm12/golibs/logging"
-	"inet.af/netaddr"
-)
-
-func OverrideWithBool(existing, other *bool) (result *bool) {
-	if other == nil {
-		return existing
-	}
-	result = new(bool)
-	*result = *other
-	return result
-}
-
-func OverrideWithString(existing, other string) (result string) {
-	if other == "" {
-		return existing
-	}
-	return other
-}
-
-func OverrideWithStringPtr(existing, other *string) (result *string) {
-	if other == nil {
-		return existing
-	}
-	result = new(string)
-	*result = *other
-	return result
-}
-
-func OverrideWithInt(existing, other *int) (result *int) {
-	if other == nil {
-		return existing
-	}
-	result = new(int)
-	*result = *other
-	return result
-}
-
-func OverrideWithUint8(existing, other *uint8) (result *uint8) {
-	if other == nil {
-		return existing
-	}
-	result = new(uint8)
-	*result = *other
-	return result
-}
-
-func OverrideWithUint16(existing, other *uint16) (result *uint16) {
-	if other == nil {
-		return existing
-	}
-	result = new(uint16)
-	*result = *other
-	return result
-}
-
-func OverrideWithIP(existing, other net.IP) (result net.IP) {
-	if other == nil {
-		return existing
-	}
-	result = make(net.IP, len(other))
-	copy(result, other)
-	return result
-}
-
-func OverrideWithDuration(existing, other *time.Duration) (result *time.Duration) {
-	if other == nil {
-		return existing
-	}
-	result = new(time.Duration)
-	*result = *other
-	return result
-}
-
-func OverrideWithLogLevel(existing, other *logging.Level) (result *logging.Level) {
-	if other == nil {
-		return existing
-	}
-	result = new(logging.Level)
-	*result = *other
-	return result
-}
-
-func OverrideWithStringSlice(existing, other []string) (result []string) {
-	if other == nil {
-		return existing
-	}
-	result = make([]string, len(other))
-	copy(result, other)
-	return result
-}
-
-func OverrideWithUint16Slice(existing, other []uint16) (result []uint16) {
-	if other == nil {
-		return existing
-	}
-	result = make([]uint16, len(other))
-	copy(result, other)
-	return result
-}
-
-func OverrideWithIPNetsSlice(existing, other []net.IPNet) (result []net.IPNet) {
-	if other == nil {
-		return existing
-	}
-	result = make([]net.IPNet, len(other))
-	copy(result, other)
-	return result
-}
-
-func OverrideWithNetaddrIPsSlice(existing, other []netaddr.IP) (result []netaddr.IP) {
-	if other == nil {
-		return existing
-	}
-	result = make([]netaddr.IP, len(other))
-	copy(result, other)
-	return result
-}
-
-func OverrideWithIPPrefixesSlice(existing, other []netaddr.IPPrefix) (result []netaddr.IPPrefix) {
-	if other == nil {
-		return existing
-	}
-	result = make([]netaddr.IPPrefix, len(other))
-	copy(result, other)
-	return result
-}
--- a/internal/configuration/settings/helpers/pointers.go
+++ b/internal/configuration/settings/helpers/pointers.go
@@ -1,11 +0,0 @@
-package helpers
-
-import "time"
-
-// StringPtr returns a pointer to the string value
-// passed as argument.
-func StringPtr(s string) *string { return &s }
-
-// DurationPtr returns a pointer to the duration value
-// passed as argument.
-func DurationPtr(d time.Duration) *time.Duration { return &d }
--- a/internal/configuration/settings/helpers/string.go
+++ b/internal/configuration/settings/helpers/string.go
@@ -1,15 +0,0 @@
-package helpers
-
-func BoolPtrToYesNo(b *bool) string {
-	if *b {
-		return "yes"
-	}
-	return "no"
-}
-
-func TCPPtrToString(tcp *bool) string {
-	if *tcp {
-		return "TCP"
-	}
-	return "UDP"
-}
--- a/internal/configuration/settings/helpers_test.go
+++ b/internal/configuration/settings/helpers_test.go
@@ -1,4 +0,0 @@
-package settings
-
-func boolPtr(b bool) *bool    { return &b }
-func uint8Ptr(n uint8) *uint8 { return &n }
--- a/internal/configuration/settings/httpproxy.go
+++ b/internal/configuration/settings/httpproxy.go
@@ -1,112 +0,0 @@
-package settings
-
-import (
-	"fmt"
-	"os"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
-	"github.com/qdm12/gotree"
-	"github.com/qdm12/govalid/address"
-)
-
-// HTTPProxy contains settings to configure the HTTP proxy.
-type HTTPProxy struct {
-	// User is the username to use for the HTTP proxy.
-	// It cannot be nil in the internal state.
-	User *string
-	// Password is the password to use for the HTTP proxy.
-	// It cannot be nil in the internal state.
-	Password *string
-	// ListeningAddress is the listening address
-	// of the HTTP proxy server.
-	// It cannot be the empty string in the internal state.
-	ListeningAddress string
-	// Enabled is true if the HTTP proxy server should run,
-	// and false otherwise. It cannot be nil in the
-	// internal state.
-	Enabled *bool
-	// Stealth is true if the HTTP proxy server should hide
-	// each request has been proxied to the destination.
-	// It cannot be nil in the internal state.
-	Stealth *bool
-	// Log is true if the HTTP proxy server should log
-	// each request/response. It cannot be nil in the
-	// internal state.
-	Log *bool
-}
-
-func (h HTTPProxy) validate() (err error) {
-	// Do not validate user and password
-
-	uid := os.Getuid()
-	_, err = address.Validate(h.ListeningAddress, address.OptionListening(uid))
-	if err != nil {
-		return fmt.Errorf("%w: %s",
-			ErrServerAddressNotValid, h.ListeningAddress)
-	}
-
-	return nil
-}
-
-func (h *HTTPProxy) copy() (copied HTTPProxy) {
-	return HTTPProxy{
-		User:             helpers.CopyStringPtr(h.User),
-		Password:         helpers.CopyStringPtr(h.Password),
-		ListeningAddress: h.ListeningAddress,
-		Enabled:          helpers.CopyBoolPtr(h.Enabled),
-		Stealth:          helpers.CopyBoolPtr(h.Stealth),
-		Log:              helpers.CopyBoolPtr(h.Log),
-	}
-}
-
-// mergeWith merges the other settings into any
-// unset field of the receiver settings object.
-func (h *HTTPProxy) mergeWith(other HTTPProxy) {
-	h.User = helpers.MergeWithStringPtr(h.User, other.User)
-	h.Password = helpers.MergeWithStringPtr(h.Password, other.Password)
-	h.ListeningAddress = helpers.MergeWithString(h.ListeningAddress, other.ListeningAddress)
-	h.Enabled = helpers.MergeWithBool(h.Enabled, other.Enabled)
-	h.Stealth = helpers.MergeWithBool(h.Stealth, other.Stealth)
-	h.Log = helpers.MergeWithBool(h.Log, other.Log)
-}
-
-// overrideWith overrides fields of the receiver
-// settings object with any field set in the other
-// settings.
-func (h *HTTPProxy) overrideWith(other HTTPProxy) {
-	h.User = helpers.OverrideWithStringPtr(h.User, other.User)
-	h.Password = helpers.OverrideWithStringPtr(h.Password, other.Password)
-	h.ListeningAddress = helpers.OverrideWithString(h.ListeningAddress, other.ListeningAddress)
-	h.Enabled = helpers.OverrideWithBool(h.Enabled, other.Enabled)
-	h.Stealth = helpers.OverrideWithBool(h.Stealth, other.Stealth)
-	h.Log = helpers.OverrideWithBool(h.Log, other.Log)
-}
-
-func (h *HTTPProxy) setDefaults() {
-	h.User = helpers.DefaultStringPtr(h.User, "")
-	h.Password = helpers.DefaultStringPtr(h.Password, "")
-	h.ListeningAddress = helpers.DefaultString(h.ListeningAddress, ":8888")
-	h.Enabled = helpers.DefaultBool(h.Enabled, false)
-	h.Stealth = helpers.DefaultBool(h.Stealth, false)
-	h.Log = helpers.DefaultBool(h.Log, false)
-}
-
-func (h HTTPProxy) String() string {
-	return h.toLinesNode().String()
-}
-
-func (h HTTPProxy) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("HTTP proxy settings:")
-	node.Appendf("Enabled: %s", helpers.BoolPtrToYesNo(h.Enabled))
-	if !*h.Enabled {
-		return node
-	}
-
-	node.Appendf("Listening address: %s", h.ListeningAddress)
-	node.Appendf("User: %s", *h.User)
-	node.Appendf("Password: %s", helpers.ObfuscatePassword(*h.Password))
-	node.Appendf("Stealth mode: %s", helpers.BoolPtrToYesNo(h.Stealth))
-	node.Appendf("Log: %s", helpers.BoolPtrToYesNo(h.Log))
-
-	return node
-}
--- a/internal/configuration/settings/log.go
+++ b/internal/configuration/settings/log.go
@@ -1,51 +0,0 @@
-package settings
-
-import (
-	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
-	"github.com/qdm12/golibs/logging"
-	"github.com/qdm12/gotree"
-)
-
-// Log contains settings to configure the logger.
-type Log struct {
-	// Level is the log level of the logger.
-	// It cannot be nil in the internal state.
-	Level *logging.Level
-}
-
-func (l Log) validate() (err error) {
-	return nil
-}
-
-func (l *Log) copy() (copied Log) {
-	return Log{
-		Level: helpers.CopyLogLevelPtr(l.Level),
-	}
-}
-
-// mergeWith merges the other settings into any
-// unset field of the receiver settings object.
-func (l *Log) mergeWith(other Log) {
-	l.Level = helpers.MergeWithLogLevel(l.Level, other.Level)
-}
-
-// overrideWith overrides fields of the receiver
-// settings object with any field set in the other
-// settings.
-func (l *Log) overrideWith(other Log) {
-	l.Level = helpers.OverrideWithLogLevel(l.Level, other.Level)
-}
-
-func (l *Log) setDefaults() {
-	l.Level = helpers.DefaultLogLevel(l.Level, logging.LevelInfo)
-}
-
-func (l Log) String() string {
-	return l.toLinesNode().String()
-}
-
-func (l Log) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("Log settings:")
-	node.Appendf("Log level: %s", l.Level.String())
-	return node
-}
--- a/internal/configuration/settings/openvpn.go
+++ b/internal/configuration/settings/openvpn.go
@@ -1,320 +0,0 @@
-package settings
-
-import (
-	"fmt"
-	"strings"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
-	"github.com/qdm12/gluetun/internal/constants"
-	"github.com/qdm12/gluetun/internal/openvpn/parse"
-	"github.com/qdm12/gotree"
-)
-
-// OpenVPN contains settings to configure the OpenVPN client.
-type OpenVPN struct {
-	// Version is the OpenVPN version to run.
-	// It can only be "2.4" or "2.5".
-	Version string
-	// User is the OpenVPN authentication username.
-	// It cannot be an empty string in the internal state
-	// if OpenVPN is used.
-	User string
-	// Password is the OpenVPN authentication password.
-	// It cannot be an empty string in the internal state
-	// if OpenVPN is used.
-	Password string
-	// ConfFile is a custom OpenVPN configuration file path.
-	// It can be set to the empty string for it to be ignored.
-	// It cannot be nil in the internal state.
-	ConfFile *string
-	// Ciphers is a list of ciphers to use for OpenVPN,
-	// different from the ones specified by the VPN
-	// service provider configuration files.
-	Ciphers []string
-	// Auth is an auth algorithm to use in OpenVPN instead
-	// of the one specified by the VPN service provider.
-	// It cannot be nil in the internal state.
-	// It is ignored if it is set to the empty string.
-	Auth *string
-	// ClientCrt is the OpenVPN client certificate.
-	// This is notably used by Cyberghost.
-	// It can be set to the empty string to be ignored.
-	// It cannot be nil in the internal state.
-	ClientCrt *string
-	// ClientKey is the OpenVPN client key.
-	// This is used by Cyberghost and VPN Unlimited.
-	// It can be set to the empty string to be ignored.
-	// It cannot be nil in the internal state.
-	ClientKey *string
-	// PIAEncPreset is the encryption preset for
-	// Private Internet Access. It can be set to an
-	// empty string for other providers.
-	PIAEncPreset *string
-	// IPv6 is set to true if IPv6 routing should be
-	// set to be tunnel in OpenVPN, and false otherwise.
-	// It cannot be nil in the internal state.
-	IPv6 *bool // TODO automate like with Wireguard
-	// MSSFix is the value (1 to 10000) to set for the
-	// mssfix option for OpenVPN. It is ignored if set to 0.
-	// It cannot be nil in the internal state.
-	MSSFix *uint16
-	// Interface is the OpenVPN device interface name.
-	// It cannot be an empty string in the internal state.
-	Interface string
-	// Root is true if OpenVPN is to be run as root,
-	// and false otherwise. It cannot be nil in the
-	// internal state.
-	Root *bool
-	// ProcUser is the OpenVPN process OS username
-	// to use. It cannot be nil in the internal state.
-	// This is set and injected at runtime.
-	// TODO only use ProcUser and not Root field.
-	ProcUser string
-	// Verbosity is the OpenVPN verbosity level from 0 to 6.
-	// It cannot be nil in the internal state.
-	Verbosity *int
-	// Flags is a slice of additional flags to be passed
-	// to the OpenVPN program.
-	Flags []string
-}
-
-func (o OpenVPN) validate(vpnProvider string) (err error) {
-	// Validate version
-	validVersions := []string{constants.Openvpn24, constants.Openvpn25}
-	if !helpers.IsOneOf(o.Version, validVersions...) {
-		return fmt.Errorf("%w: %q can only be one of %s",
-			ErrOpenVPNVersionIsNotValid, o.Version, strings.Join(validVersions, ", "))
-	}
-
-	isCustom := vpnProvider == constants.Custom
-
-	if !isCustom && o.User == "" {
-		return ErrOpenVPNUserIsEmpty
-	}
-
-	if !isCustom && o.Password == "" {
-		return ErrOpenVPNPasswordIsEmpty
-	}
-
-	// Validate ConfFile
-	if isCustom {
-		if *o.ConfFile == "" {
-			return fmt.Errorf("%w: no file path specified", ErrOpenVPNConfigFile)
-		}
-		err := helpers.FileExists(*o.ConfFile)
-		if err != nil {
-			return fmt.Errorf("%w: %s", ErrOpenVPNConfigFile, err)
-		}
-	}
-
-	// Check client certificate
-	switch vpnProvider {
-	case
-		constants.Cyberghost,
-		constants.VPNUnlimited:
-		if *o.ClientCrt == "" {
-			return ErrOpenVPNClientCertMissing
-		}
-	}
-	if *o.ClientCrt != "" {
-		_, err = parse.ExtractCert([]byte(*o.ClientCrt))
-		if err != nil {
-			return fmt.Errorf("%w: %s", ErrOpenVPNClientCertNotValid, err)
-		}
-	}
-
-	// Check client key
-	switch vpnProvider {
-	case
-		constants.Cyberghost,
-		constants.VPNUnlimited,
-		constants.Wevpn:
-		if *o.ClientKey == "" {
-			return ErrOpenVPNClientKeyMissing
-		}
-	}
-	if *o.ClientKey != "" {
-		_, err = parse.ExtractPrivateKey([]byte(*o.ClientKey))
-		if err != nil {
-			return fmt.Errorf("%w: %s", ErrOpenVPNClientKeyNotValid, err)
-		}
-	}
-
-	// Validate MSSFix
-	const maxMSSFix = 10000
-	if *o.MSSFix > maxMSSFix {
-		return fmt.Errorf("%w: %d is over the maximum value of %d",
-			ErrOpenVPNMSSFixIsTooHigh, *o.MSSFix, maxMSSFix)
-	}
-
-	if !regexpInterfaceName.MatchString(o.Interface) {
-		return fmt.Errorf("%w: '%s' does not match regex '%s'",
-			ErrOpenVPNInterfaceNotValid, o.Interface, regexpInterfaceName)
-	}
-
-	// Validate Verbosity
-	if *o.Verbosity < 0 || *o.Verbosity > 6 {
-		return fmt.Errorf("%w: %d can only be between 0 and 5",
-			ErrOpenVPNVerbosityIsOutOfBounds, o.Verbosity)
-	}
-
-	return nil
-}
-
-func (o *OpenVPN) copy() (copied OpenVPN) {
-	return OpenVPN{
-		Version:      o.Version,
-		User:         o.User,
-		Password:     o.Password,
-		ConfFile:     helpers.CopyStringPtr(o.ConfFile),
-		Ciphers:      helpers.CopyStringSlice(o.Ciphers),
-		Auth:         helpers.CopyStringPtr(o.Auth),
-		ClientCrt:    helpers.CopyStringPtr(o.ClientCrt),
-		ClientKey:    helpers.CopyStringPtr(o.ClientKey),
-		PIAEncPreset: helpers.CopyStringPtr(o.PIAEncPreset),
-		IPv6:         helpers.CopyBoolPtr(o.IPv6),
-		MSSFix:       helpers.CopyUint16Ptr(o.MSSFix),
-		Interface:    o.Interface,
-		Root:         helpers.CopyBoolPtr(o.Root),
-		ProcUser:     o.ProcUser,
-		Verbosity:    helpers.CopyIntPtr(o.Verbosity),
-		Flags:        helpers.CopyStringSlice(o.Flags),
-	}
-}
-
-// mergeWith merges the other settings into any
-// unset field of the receiver settings object.
-func (o *OpenVPN) mergeWith(other OpenVPN) {
-	o.Version = helpers.MergeWithString(o.Version, other.Version)
-	o.User = helpers.MergeWithString(o.User, other.User)
-	o.Password = helpers.MergeWithString(o.Password, other.Password)
-	o.ConfFile = helpers.MergeWithStringPtr(o.ConfFile, other.ConfFile)
-	o.Ciphers = helpers.MergeStringSlices(o.Ciphers, other.Ciphers)
-	o.Auth = helpers.MergeWithStringPtr(o.Auth, other.Auth)
-	o.ClientCrt = helpers.MergeWithStringPtr(o.ClientCrt, other.ClientCrt)
-	o.ClientKey = helpers.MergeWithStringPtr(o.ClientKey, other.ClientKey)
-	o.PIAEncPreset = helpers.MergeWithStringPtr(o.PIAEncPreset, other.PIAEncPreset)
-	o.IPv6 = helpers.MergeWithBool(o.IPv6, other.IPv6)
-	o.MSSFix = helpers.MergeWithUint16(o.MSSFix, other.MSSFix)
-	o.Interface = helpers.MergeWithString(o.Interface, other.Interface)
-	o.Root = helpers.MergeWithBool(o.Root, other.Root)
-	o.ProcUser = helpers.MergeWithString(o.ProcUser, other.ProcUser)
-	o.Verbosity = helpers.MergeWithInt(o.Verbosity, other.Verbosity)
-	o.Flags = helpers.MergeStringSlices(o.Flags, other.Flags)
-}
-
-// overrideWith overrides fields of the receiver
-// settings object with any field set in the other
-// settings.
-func (o *OpenVPN) overrideWith(other OpenVPN) {
-	o.Version = helpers.OverrideWithString(o.Version, other.Version)
-	o.User = helpers.OverrideWithString(o.User, other.User)
-	o.Password = helpers.OverrideWithString(o.Password, other.Password)
-	o.ConfFile = helpers.OverrideWithStringPtr(o.ConfFile, other.ConfFile)
-	o.Ciphers = helpers.OverrideWithStringSlice(o.Ciphers, other.Ciphers)
-	o.Auth = helpers.OverrideWithStringPtr(o.Auth, other.Auth)
-	o.ClientCrt = helpers.OverrideWithStringPtr(o.ClientCrt, other.ClientCrt)
-	o.ClientKey = helpers.OverrideWithStringPtr(o.ClientKey, other.ClientKey)
-	o.PIAEncPreset = helpers.OverrideWithStringPtr(o.PIAEncPreset, other.PIAEncPreset)
-	o.IPv6 = helpers.OverrideWithBool(o.IPv6, other.IPv6)
-	o.MSSFix = helpers.OverrideWithUint16(o.MSSFix, other.MSSFix)
-	o.Interface = helpers.OverrideWithString(o.Interface, other.Interface)
-	o.Root = helpers.OverrideWithBool(o.Root, other.Root)
-	o.ProcUser = helpers.OverrideWithString(o.ProcUser, other.ProcUser)
-	o.Verbosity = helpers.OverrideWithInt(o.Verbosity, other.Verbosity)
-	o.Flags = helpers.OverrideWithStringSlice(o.Flags, other.Flags)
-}
-
-func (o *OpenVPN) setDefaults(vpnProvider string) {
-	o.Version = helpers.DefaultString(o.Version, constants.Openvpn25)
-	if vpnProvider == constants.Mullvad {
-		o.Password = "m"
-	}
-
-	o.ConfFile = helpers.DefaultStringPtr(o.ConfFile, "")
-	o.Auth = helpers.DefaultStringPtr(o.Auth, "")
-	o.ClientCrt = helpers.DefaultStringPtr(o.ClientCrt, "")
-	o.ClientKey = helpers.DefaultStringPtr(o.ClientKey, "")
-
-	var defaultEncPreset string
-	if vpnProvider == constants.PrivateInternetAccess {
-		defaultEncPreset = constants.PIAEncryptionPresetStrong
-	}
-	o.PIAEncPreset = helpers.DefaultStringPtr(o.PIAEncPreset, defaultEncPreset)
-
-	o.IPv6 = helpers.DefaultBool(o.IPv6, false)
-	o.MSSFix = helpers.DefaultUint16(o.MSSFix, 0)
-	o.Interface = helpers.DefaultString(o.Interface, "tun0")
-	o.Root = helpers.DefaultBool(o.Root, true)
-	o.ProcUser = helpers.DefaultString(o.ProcUser, "root")
-	o.Verbosity = helpers.DefaultInt(o.Verbosity, 1)
-}
-
-func (o OpenVPN) String() string {
-	return o.toLinesNode().String()
-}
-
-func (o OpenVPN) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("OpenVPN settings:")
-	node.Appendf("OpenVPN version: %s", o.Version)
-	node.Appendf("User: %s", helpers.ObfuscatePassword(o.User))
-	node.Appendf("Password: %s", helpers.ObfuscatePassword(o.Password))
-
-	if *o.ConfFile != "" {
-		node.Appendf("Custom configuration file: %s", *o.ConfFile)
-	}
-
-	if len(o.Ciphers) > 0 {
-		node.Appendf("Ciphers: %s", o.Ciphers)
-	}
-
-	if *o.Auth != "" {
-		node.Appendf("Auth: %s", *o.Auth)
-	}
-
-	if *o.ClientCrt != "" {
-		node.Appendf("Client crt: %s", helpers.ObfuscateData(*o.ClientCrt))
-	}
-
-	if *o.ClientKey != "" {
-		node.Appendf("Client key: %s", helpers.ObfuscateData(*o.ClientKey))
-	}
-
-	if *o.PIAEncPreset != "" {
-		node.Appendf("Private Internet Access encryption preset: %s", *o.PIAEncPreset)
-	}
-
-	node.Appendf("Tunnel IPv6: %s", helpers.BoolPtrToYesNo(o.IPv6))
-
-	if *o.MSSFix > 0 {
-		node.Appendf("MSS Fix: %d", *o.MSSFix)
-	}
-
-	if o.Interface != "" {
-		node.Appendf("Network interface: %s", o.Interface)
-	}
-
-	processUser := "root"
-	if !*o.Root {
-		processUser = "some non root user" // TODO
-		if o.ProcUser != "" {
-			processUser = o.ProcUser
-		}
-	}
-	node.Appendf("Run OpenVPN as: %s", processUser)
-
-	node.Appendf("Verbosity level: %d", *o.Verbosity)
-
-	if len(o.Flags) > 0 {
-		node.Appendf("Flags: %s", o.Flags)
-	}
-
-	return node
-}
-
-// WithDefaults is a shorthand using setDefaults.
-// It's used in unit tests in other packages.
-func (o OpenVPN) WithDefaults(provider string) OpenVPN {
-	o.setDefaults(provider)
-	return o
-}
--- a/internal/configuration/settings/openvpnselection.go
+++ b/internal/configuration/settings/openvpnselection.go
@@ -1,170 +0,0 @@
-package settings
-
-import (
-	"fmt"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
-	"github.com/qdm12/gluetun/internal/constants"
-	"github.com/qdm12/gotree"
-)
-
-type OpenVPNSelection struct {
-	// ConfFile is the custom configuration file path.
-	// It can be set to an empty string to indicate to
-	// NOT use a custom configuration file.
-	// It cannot be nil in the internal state.
-	ConfFile *string
-	// TCP is true if the OpenVPN protocol is TCP,
-	// and false for UDP.
-	// It cannot be nil in the internal state.
-	TCP *bool
-	// CustomPort is the OpenVPN server endpoint port.
-	// It can be set to 0 to indicate no custom port should
-	// be used. It cannot be nil in the internal state.
-	CustomPort *uint16 // HideMyAss, Mullvad, PIA, ProtonVPN, WeVPN, Windscribe
-	// PIAEncPreset is the encryption preset for
-	// Private Internet Access. It can be set to an
-	// empty string for other providers.
-	PIAEncPreset *string
-}
-
-func (o OpenVPNSelection) validate(vpnProvider string) (err error) {
-	// Validate ConfFile
-	if confFile := *o.ConfFile; confFile != "" {
-		err := helpers.FileExists(confFile)
-		if err != nil {
-			return fmt.Errorf("%w: %s", ErrOpenVPNConfigFile, err)
-		}
-	}
-
-	// Validate TCP
-	if *o.TCP && helpers.IsOneOf(vpnProvider,
-		constants.Perfectprivacy,
-		constants.Privado,
-		constants.Vyprvpn,
-	) {
-		return fmt.Errorf("%w: for VPN service provider %s",
-			ErrOpenVPNTCPNotSupported, vpnProvider)
-	}
-
-	// Validate CustomPort
-	if *o.CustomPort != 0 {
-		switch vpnProvider {
-		// no restriction on port
-		case constants.Cyberghost, constants.HideMyAss,
-			constants.PrivateInternetAccess, constants.Privatevpn,
-			constants.Protonvpn, constants.Torguard:
-		// no custom port allowed
-		case constants.Expressvpn, constants.Fastestvpn,
-			constants.Ipvanish, constants.Nordvpn,
-			constants.Privado, constants.Purevpn,
-			constants.Surfshark, constants.VPNUnlimited,
-			constants.Vyprvpn:
-			return fmt.Errorf("%w: for VPN service provider %s",
-				ErrOpenVPNCustomPortNotAllowed, vpnProvider)
-		default:
-			var allowedTCP, allowedUDP []uint16
-			switch vpnProvider {
-			case constants.Ivpn:
-				allowedTCP = []uint16{80, 443, 1143}
-				allowedUDP = []uint16{53, 1194, 2049, 2050}
-			case constants.Mullvad:
-				allowedTCP = []uint16{80, 443, 1401}
-				allowedUDP = []uint16{53, 1194, 1195, 1196, 1197, 1300, 1301, 1302, 1303, 1400}
-			case constants.Perfectprivacy:
-				allowedTCP = []uint16{44, 443, 4433}
-				allowedUDP = []uint16{44, 443, 4433}
-			case constants.Wevpn:
-				allowedTCP = []uint16{53, 1195, 1199, 2018}
-				allowedUDP = []uint16{80, 1194, 1198}
-			case constants.Windscribe:
-				allowedTCP = []uint16{21, 22, 80, 123, 143, 443, 587, 1194, 3306, 8080, 54783}
-				allowedUDP = []uint16{53, 80, 123, 443, 1194, 54783}
-			}
-
-			if *o.TCP && !helpers.Uint16IsOneOf(*o.CustomPort, allowedTCP) {
-				return fmt.Errorf("%w: %d for VPN service provider %s; %s",
-					ErrOpenVPNCustomPortNotAllowed, o.CustomPort, vpnProvider,
-					helpers.PortChoicesOrString(allowedTCP))
-			} else if !*o.TCP && !helpers.Uint16IsOneOf(*o.CustomPort, allowedUDP) {
-				return fmt.Errorf("%w: %d for VPN service provider %s; %s",
-					ErrOpenVPNCustomPortNotAllowed, o.CustomPort, vpnProvider,
-					helpers.PortChoicesOrString(allowedUDP))
-			}
-		}
-	}
-
-	// Validate EncPreset
-	if vpnProvider == constants.PrivateInternetAccess {
-		validEncryptionPresets := []string{
-			constants.PIAEncryptionPresetNone,
-			constants.PIAEncryptionPresetNormal,
-			constants.PIAEncryptionPresetStrong,
-		}
-		if !helpers.IsOneOf(*o.PIAEncPreset, validEncryptionPresets...) {
-			return fmt.Errorf("%w: %s; valid presets are %s",
-				ErrOpenVPNEncryptionPresetNotValid, *o.PIAEncPreset,
-				helpers.ChoicesOrString(validEncryptionPresets))
-		}
-	}
-
-	return nil
-}
-
-func (o *OpenVPNSelection) copy() (copied OpenVPNSelection) {
-	return OpenVPNSelection{
-		ConfFile:     helpers.CopyStringPtr(o.ConfFile),
-		TCP:          helpers.CopyBoolPtr(o.TCP),
-		CustomPort:   helpers.CopyUint16Ptr(o.CustomPort),
-		PIAEncPreset: helpers.CopyStringPtr(o.PIAEncPreset),
-	}
-}
-
-func (o *OpenVPNSelection) mergeWith(other OpenVPNSelection) {
-	o.ConfFile = helpers.MergeWithStringPtr(o.ConfFile, other.ConfFile)
-	o.TCP = helpers.MergeWithBool(o.TCP, other.TCP)
-	o.CustomPort = helpers.MergeWithUint16(o.CustomPort, other.CustomPort)
-	o.PIAEncPreset = helpers.MergeWithStringPtr(o.PIAEncPreset, other.PIAEncPreset)
-}
-
-func (o *OpenVPNSelection) overrideWith(other OpenVPNSelection) {
-	o.ConfFile = helpers.OverrideWithStringPtr(o.ConfFile, other.ConfFile)
-	o.TCP = helpers.OverrideWithBool(o.TCP, other.TCP)
-	o.CustomPort = helpers.OverrideWithUint16(o.CustomPort, other.CustomPort)
-	o.PIAEncPreset = helpers.OverrideWithStringPtr(o.PIAEncPreset, other.PIAEncPreset)
-}
-
-func (o *OpenVPNSelection) setDefaults(vpnProvider string) {
-	o.ConfFile = helpers.DefaultStringPtr(o.ConfFile, "")
-	o.TCP = helpers.DefaultBool(o.TCP, false)
-	o.CustomPort = helpers.DefaultUint16(o.CustomPort, 0)
-
-	var defaultEncPreset string
-	if vpnProvider == constants.PrivateInternetAccess {
-		defaultEncPreset = constants.PIAEncryptionPresetStrong
-	}
-	o.PIAEncPreset = helpers.DefaultStringPtr(o.PIAEncPreset, defaultEncPreset)
-}
-
-func (o OpenVPNSelection) String() string {
-	return o.toLinesNode().String()
-}
-
-func (o OpenVPNSelection) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("OpenVPN server selection settings:")
-	node.Appendf("Protocol: %s", helpers.TCPPtrToString(o.TCP))
-
-	if *o.CustomPort != 0 {
-		node.Appendf("Custom port: %d", *o.CustomPort)
-	}
-
-	if *o.PIAEncPreset != "" {
-		node.Appendf("Private Internet Access encryption preset: %s", *o.PIAEncPreset)
-	}
-
-	if *o.ConfFile != "" {
-		node.Appendf("Custom configuration file: %s", *o.ConfFile)
-	}
-
-	return node
-}
--- a/internal/configuration/settings/portforward.go
+++ b/internal/configuration/settings/portforward.go
@@ -1,89 +0,0 @@
-package settings
-
-import (
-	"fmt"
-	"path/filepath"
-	"strings"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
-	"github.com/qdm12/gluetun/internal/constants"
-	"github.com/qdm12/gotree"
-)
-
-// PortForwarding contains settings for port forwarding.
-type PortForwarding struct {
-	// Enabled is true if port forwarding should be activated.
-	// It cannot be nil for the internal state.
-	Enabled *bool
-	// Filepath is the port forwarding status file path
-	// to use. It can be the empty string to indicate not
-	// to write to a file. It cannot be nil for the
-	// internal state
-	Filepath *string
-}
-
-func (p PortForwarding) validate(vpnProvider string) (err error) {
-	if !*p.Enabled {
-		return nil
-	}
-
-	// Validate Enabled
-	validProviders := []string{constants.PrivateInternetAccess}
-	if !helpers.IsOneOf(vpnProvider, validProviders...) {
-		return fmt.Errorf("%w: for provider %s, it is only available for %s",
-			ErrPortForwardingEnabled, vpnProvider, strings.Join(validProviders, ", "))
-	}
-
-	// Validate Filepath
-	if *p.Filepath != "" { // optional
-		_, err := filepath.Abs(*p.Filepath)
-		if err != nil {
-			return fmt.Errorf("%w: %s", ErrPortForwardingFilepathNotValid, err)
-		}
-	}
-
-	return nil
-}
-
-func (p *PortForwarding) copy() (copied PortForwarding) {
-	return PortForwarding{
-		Enabled:  helpers.CopyBoolPtr(p.Enabled),
-		Filepath: helpers.CopyStringPtr(p.Filepath),
-	}
-}
-
-func (p *PortForwarding) mergeWith(other PortForwarding) {
-	p.Enabled = helpers.MergeWithBool(p.Enabled, other.Enabled)
-	p.Filepath = helpers.MergeWithStringPtr(p.Filepath, other.Filepath)
-}
-
-func (p *PortForwarding) overrideWith(other PortForwarding) {
-	p.Enabled = helpers.OverrideWithBool(p.Enabled, other.Enabled)
-	p.Filepath = helpers.OverrideWithStringPtr(p.Filepath, other.Filepath)
-}
-
-func (p *PortForwarding) setDefaults() {
-	p.Enabled = helpers.DefaultBool(p.Enabled, false)
-	p.Filepath = helpers.DefaultStringPtr(p.Filepath, "/tmp/gluetun/forwarded_port")
-}
-
-func (p PortForwarding) String() string {
-	return p.toLinesNode().String()
-}
-
-func (p PortForwarding) toLinesNode() (node *gotree.Node) {
-	if !*p.Enabled {
-		return nil
-	}
-
-	node = gotree.New("Automatic port forwarding settings:")
-	node.Appendf("Enabled: yes")
-
-	filepath := *p.Filepath
-	if filepath == "" {
-		filepath = "[not set]"
-	}
-	node.Appendf("Forwarded port file path: %s", filepath)
-
-	return node
-}
--- a/internal/configuration/settings/portforward_test.go
+++ b/internal/configuration/settings/portforward_test.go
@@ -1,19 +0,0 @@
-package settings
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func Test_PortForwarding_String(t *testing.T) {
-	t.Parallel()
-
-	settings := PortForwarding{
-		Enabled: boolPtr(false),
-	}
-
-	s := settings.String()
-
-	assert.Empty(t, s)
-}
--- a/internal/configuration/settings/provider.go
+++ b/internal/configuration/settings/provider.go
@@ -1,93 +0,0 @@
-package settings
-
-import (
-	"fmt"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
-	"github.com/qdm12/gluetun/internal/constants"
-	"github.com/qdm12/gluetun/internal/models"
-	"github.com/qdm12/gotree"
-)
-
-// Provider contains settings specific to a VPN provider.
-type Provider struct {
-	// Name is the VPN service provider name.
-	// It cannot be nil in the internal state.
-	Name *string
-	// ServerSelection is the settings to
-	// select the VPN server.
-	ServerSelection ServerSelection
-	// PortForwarding is the settings about port forwarding.
-	PortForwarding PortForwarding
-}
-
-// TODO v4 remove pointer for receiver (because of Surfshark).
-func (p *Provider) validate(vpnType string, allServers models.AllServers) (err error) {
-	// Validate Name
-	var validNames []string
-	if vpnType == constants.OpenVPN {
-		validNames = constants.AllProviders()
-		validNames = append(validNames, "pia") // Retro-compatibility
-	} else { // Wireguard
-		validNames = []string{
-			constants.Custom,
-			constants.Ivpn,
-			constants.Mullvad,
-			constants.Windscribe,
-		}
-	}
-	if !helpers.IsOneOf(*p.Name, validNames...) {
-		return fmt.Errorf("%w: %q can only be one of %s",
-			ErrVPNProviderNameNotValid, *p.Name, helpers.ChoicesOrString(validNames))
-	}
-
-	err = p.ServerSelection.validate(*p.Name, allServers)
-	if err != nil {
-		return fmt.Errorf("server selection settings validation failed: %w", err)
-	}
-
-	err = p.PortForwarding.validate(*p.Name)
-	if err != nil {
-		return fmt.Errorf("port forwarding settings validation failed: %w", err)
-	}
-
-	return nil
-}
-
-func (p *Provider) copy() (copied Provider) {
-	return Provider{
-		Name:            helpers.CopyStringPtr(p.Name),
-		ServerSelection: p.ServerSelection.copy(),
-		PortForwarding:  p.PortForwarding.copy(),
-	}
-}
-
-func (p *Provider) mergeWith(other Provider) {
-	p.Name = helpers.MergeWithStringPtr(p.Name, other.Name)
-	p.ServerSelection.mergeWith(other.ServerSelection)
-	p.PortForwarding.mergeWith(other.PortForwarding)
-}
-
-func (p *Provider) overrideWith(other Provider) {
-	p.Name = helpers.OverrideWithStringPtr(p.Name, other.Name)
-	p.ServerSelection.overrideWith(other.ServerSelection)
-	p.PortForwarding.overrideWith(other.PortForwarding)
-}
-
-func (p *Provider) setDefaults() {
-	p.Name = helpers.DefaultStringPtr(p.Name, constants.PrivateInternetAccess)
-	p.ServerSelection.setDefaults(*p.Name)
-	p.PortForwarding.setDefaults()
-}
-
-func (p Provider) String() string {
-	return p.toLinesNode().String()
-}
-
-func (p Provider) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("VPN provider settings:")
-	node.Appendf("Name: %s", *p.Name)
-	node.AppendNode(p.ServerSelection.toLinesNode())
-	node.AppendNode(p.PortForwarding.toLinesNode())
-	return node
-}
--- a/internal/configuration/settings/publicip.go
+++ b/internal/configuration/settings/publicip.go
@@ -1,89 +0,0 @@
-package settings
-
-import (
-	"fmt"
-	"path/filepath"
-	"time"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
-	"github.com/qdm12/gotree"
-)
-
-// PublicIP contains settings for port forwarding.
-type PublicIP struct {
-	// Period is the period to get the public IP address.
-	// It can be set to 0 to disable periodic checking.
-	// It cannot be nil for the internal state.
-	// TODO change to value and add enabled field
-	Period *time.Duration
-	// IPFilepath is the public IP address status file path
-	// to use. It can be the empty string to indicate not
-	// to write to a file. It cannot be nil for the
-	// internal state
-	IPFilepath *string
-}
-
-func (p PublicIP) validate() (err error) {
-	const minPeriod = 5 * time.Second
-	if *p.Period < minPeriod {
-		return fmt.Errorf("%w: %s must be at least %s",
-			ErrPublicIPPeriodTooShort, p.Period, minPeriod)
-	}
-
-	if *p.IPFilepath != "" { // optional
-		_, err := filepath.Abs(*p.IPFilepath)
-		if err != nil {
-			return fmt.Errorf("%w: %s", ErrPublicIPFilepathNotValid, err)
-		}
-	}
-
-	return nil
-}
-
-func (p *PublicIP) copy() (copied PublicIP) {
-	return PublicIP{
-		Period:     helpers.CopyDurationPtr(p.Period),
-		IPFilepath: helpers.CopyStringPtr(p.IPFilepath),
-	}
-}
-
-func (p *PublicIP) mergeWith(other PublicIP) {
-	p.Period = helpers.MergeWithDuration(p.Period, other.Period)
-	p.IPFilepath = helpers.MergeWithStringPtr(p.IPFilepath, other.IPFilepath)
-}
-
-func (p *PublicIP) overrideWith(other PublicIP) {
-	p.Period = helpers.OverrideWithDuration(p.Period, other.Period)
-	p.IPFilepath = helpers.OverrideWithStringPtr(p.IPFilepath, other.IPFilepath)
-}
-
-func (p *PublicIP) setDefaults() {
-	const defaultPeriod = 12 * time.Hour
-	p.Period = helpers.DefaultDuration(p.Period, defaultPeriod)
-	p.IPFilepath = helpers.DefaultStringPtr(p.IPFilepath, "/tmp/gluetun/ip")
-}
-
-func (p PublicIP) String() string {
-	return p.toLinesNode().String()
-}
-
-func (p PublicIP) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("Public IP settings:")
-
-	if *p.Period == 0 {
-		node.Appendf("Enabled: no")
-		return node
-	}
-
-	updatePeriod := "disabled"
-	if *p.Period > 0 {
-		updatePeriod = "every " + p.Period.String()
-	}
-	node.Appendf("Fetching: %s", updatePeriod)
-
-	if *p.IPFilepath != "" {
-		node.Appendf("IP file path: %s", *p.IPFilepath)
-	}
-
-	return node
-}
--- a/internal/configuration/settings/server.go
+++ b/internal/configuration/settings/server.go
@@ -1,71 +0,0 @@
-package settings
-
-import (
-	"fmt"
-	"os"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
-	"github.com/qdm12/gotree"
-)
-
-// ControlServer contains settings to customize the control server operation.
-type ControlServer struct {
-	// Port is the listening port to use.
-	// It can be set to 0 to bind to a random port.
-	// It cannot be nil in the internal state.
-	// TODO change to address
-	Port *uint16
-	// Log can be true or false to enable logging on requests.
-	// It cannot be nil in the internal state.
-	Log *bool
-}
-
-func (c ControlServer) validate() (err error) {
-	uid := os.Getuid()
-	const maxPrivilegedPort uint16 = 1023
-	if uid != 0 && *c.Port <= maxPrivilegedPort {
-		return fmt.Errorf("%w: %d when running with user ID %d",
-			ErrControlServerPrivilegedPort, *c.Port, uid)
-	}
-
-	return nil
-}
-
-func (c *ControlServer) copy() (copied ControlServer) {
-	return ControlServer{
-		Port: helpers.CopyUint16Ptr(c.Port),
-		Log:  helpers.CopyBoolPtr(c.Log),
-	}
-}
-
-// mergeWith merges the other settings into any
-// unset field of the receiver settings object.
-func (c *ControlServer) mergeWith(other ControlServer) {
-	c.Port = helpers.MergeWithUint16(c.Port, other.Port)
-	c.Log = helpers.MergeWithBool(c.Log, other.Log)
-}
-
-// overrideWith overrides fields of the receiver
-// settings object with any field set in the other
-// settings.
-func (c *ControlServer) overrideWith(other ControlServer) {
-	c.Port = helpers.MergeWithUint16(c.Port, other.Port)
-	c.Log = helpers.MergeWithBool(c.Log, other.Log)
-}
-
-func (c *ControlServer) setDefaults() {
-	const defaultPort = 8000
-	c.Port = helpers.DefaultUint16(c.Port, defaultPort)
-	c.Log = helpers.DefaultBool(c.Log, true)
-}
-
-func (c ControlServer) String() string {
-	return c.toLinesNode().String()
-}
-
-func (c ControlServer) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("Control server settings:")
-	node.Appendf("Listening port: %d", *c.Port)
-	node.Appendf("Logging: %s", helpers.BoolPtrToYesNo(c.Log))
-	return node
-}
--- a/internal/configuration/settings/serverselection.go
+++ b/internal/configuration/settings/serverselection.go
@@ -1,389 +0,0 @@
-package settings
-
-import (
-	"fmt"
-	"net"
-	"strings"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
-	"github.com/qdm12/gluetun/internal/constants"
-	"github.com/qdm12/gluetun/internal/models"
-	"github.com/qdm12/gotree"
-)
-
-type ServerSelection struct { //nolint:maligned
-	// VPN is the VPN type which can be 'openvpn'
-	// or 'wireguard'. It cannot be the empty string
-	// in the internal state.
-	VPN string
-	// TargetIP is the server endpoint IP address to use.
-	// It will override any IP address from the picked
-	// built-in server. It cannot be nil in the internal
-	// state, and can be set to an empty net.IP{} to indicate
-	// there is not target IP address to use.
-	TargetIP net.IP
-	// Counties is the list of countries to filter VPN servers with.
-	Countries []string
-	// Regions is the list of regions to filter VPN servers with.
-	Regions []string
-	// Cities is the list of cities to filter VPN servers with.
-	Cities []string
-	// ISPs is the list of ISP names to filter VPN servers with.
-	ISPs []string
-	// Names is the list of server names to filter VPN servers with.
-	Names []string
-	// Numbers is the list of server numbers to filter VPN servers with.
-	Numbers []uint16
-	// Hostnames is the list of hostnames to filter VPN servers with.
-	Hostnames []string
-	// OwnedOnly is true if only VPN provider owned servers
-	// should be filtered. This is used with Mullvad.
-	OwnedOnly *bool
-	// FreeOnly is true if only free VPN servers
-	// should be filtered. This is used with ProtonVPN.
-	FreeOnly *bool
-	// FreeOnly is true if only free VPN servers
-	// should be filtered. This is used with ProtonVPN.
-	StreamOnly *bool
-	// MultiHopOnly is true if only multihop VPN servers
-	// should be filtered. This is used with Surfshark.
-	MultiHopOnly *bool
-
-	// OpenVPN contains settings to select OpenVPN servers
-	// and the final connection.
-	OpenVPN OpenVPNSelection
-	// Wireguard contains settings to select Wireguard servers
-	// and the final connection.
-	Wireguard WireguardSelection
-}
-
-func (ss *ServerSelection) validate(vpnServiceProvider string,
-	allServers models.AllServers) (err error) {
-	switch ss.VPN {
-	case constants.OpenVPN, constants.Wireguard:
-	default:
-		return fmt.Errorf("%w: %s", ErrVPNTypeNotValid, ss.VPN)
-	}
-
-	var countryChoices, regionChoices, cityChoices,
-		ispChoices, nameChoices, hostnameChoices []string
-	switch vpnServiceProvider {
-	case constants.Custom:
-	case constants.Cyberghost:
-		servers := allServers.GetCyberghost()
-		countryChoices = constants.CyberghostCountryChoices(servers)
-		hostnameChoices = constants.CyberghostHostnameChoices(servers)
-	case constants.Expressvpn:
-		servers := allServers.GetExpressvpn()
-		countryChoices = constants.ExpressvpnCountriesChoices(servers)
-		cityChoices = constants.ExpressvpnCityChoices(servers)
-		hostnameChoices = constants.ExpressvpnHostnameChoices(servers)
-	case constants.Fastestvpn:
-		servers := allServers.GetFastestvpn()
-		countryChoices = constants.FastestvpnCountriesChoices(servers)
-		hostnameChoices = constants.FastestvpnHostnameChoices(servers)
-	case constants.HideMyAss:
-		servers := allServers.GetHideMyAss()
-		countryChoices = constants.HideMyAssCountryChoices(servers)
-		regionChoices = constants.HideMyAssRegionChoices(servers)
-		cityChoices = constants.HideMyAssCityChoices(servers)
-		hostnameChoices = constants.HideMyAssHostnameChoices(servers)
-	case constants.Ipvanish:
-		servers := allServers.GetIpvanish()
-		countryChoices = constants.IpvanishCountryChoices(servers)
-		cityChoices = constants.IpvanishCityChoices(servers)
-		hostnameChoices = constants.IpvanishHostnameChoices(servers)
-	case constants.Ivpn:
-		servers := allServers.GetIvpn()
-		countryChoices = constants.IvpnCountryChoices(servers)
-		cityChoices = constants.IvpnCityChoices(servers)
-		ispChoices = constants.IvpnISPChoices(servers)
-		hostnameChoices = constants.IvpnHostnameChoices(servers)
-	case constants.Mullvad:
-		servers := allServers.GetMullvad()
-		countryChoices = constants.MullvadCountryChoices(servers)
-		cityChoices = constants.MullvadCityChoices(servers)
-		ispChoices = constants.MullvadISPChoices(servers)
-		hostnameChoices = constants.MullvadHostnameChoices(servers)
-	case constants.Nordvpn:
-		servers := allServers.GetNordvpn()
-		regionChoices = constants.NordvpnRegionChoices(servers)
-		hostnameChoices = constants.NordvpnHostnameChoices(servers)
-	case constants.Perfectprivacy:
-		servers := allServers.GetPerfectprivacy()
-		cityChoices = constants.PerfectprivacyCityChoices(servers)
-	case constants.Privado:
-		servers := allServers.GetPrivado()
-		countryChoices = constants.PrivadoCountryChoices(servers)
-		regionChoices = constants.PrivadoRegionChoices(servers)
-		cityChoices = constants.PrivadoCityChoices(servers)
-		hostnameChoices = constants.PrivadoHostnameChoices(servers)
-	case constants.PrivateInternetAccess:
-		servers := allServers.GetPia()
-		regionChoices = constants.PIAGeoChoices(servers)
-		hostnameChoices = constants.PIAHostnameChoices(servers)
-		nameChoices = constants.PIANameChoices(servers)
-	case constants.Privatevpn:
-		servers := allServers.GetPrivatevpn()
-		countryChoices = constants.PrivatevpnCountryChoices(servers)
-		cityChoices = constants.PrivatevpnCityChoices(servers)
-		hostnameChoices = constants.PrivatevpnHostnameChoices(servers)
-	case constants.Protonvpn:
-		servers := allServers.GetProtonvpn()
-		countryChoices = constants.ProtonvpnCountryChoices(servers)
-		regionChoices = constants.ProtonvpnRegionChoices(servers)
-		cityChoices = constants.ProtonvpnCityChoices(servers)
-		nameChoices = constants.ProtonvpnNameChoices(servers)
-		hostnameChoices = constants.ProtonvpnHostnameChoices(servers)
-	case constants.Purevpn:
-		servers := allServers.GetPurevpn()
-		countryChoices = constants.PurevpnCountryChoices(servers)
-		regionChoices = constants.PurevpnRegionChoices(servers)
-		cityChoices = constants.PurevpnCityChoices(servers)
-		hostnameChoices = constants.PurevpnHostnameChoices(servers)
-	case constants.Surfshark:
-		servers := allServers.GetSurfshark()
-		countryChoices = constants.SurfsharkCountryChoices(servers)
-		cityChoices = constants.SurfsharkCityChoices(servers)
-		hostnameChoices = constants.SurfsharkHostnameChoices(servers)
-		regionChoices = constants.SurfsharkRegionChoices(servers)
-		// TODO v4 remove
-		regionChoices = append(regionChoices, constants.SurfsharkRetroLocChoices(servers)...)
-		if err := helpers.AreAllOneOf(ss.Regions, regionChoices); err != nil {
-			return fmt.Errorf("%w: %s", ErrRegionNotValid, err)
-		}
-		// Retro compatibility
-		// TODO remove in v4
-		*ss = surfsharkRetroRegion(*ss)
-	case constants.Torguard:
-		servers := allServers.GetTorguard()
-		countryChoices = constants.TorguardCountryChoices(servers)
-		cityChoices = constants.TorguardCityChoices(servers)
-		hostnameChoices = constants.TorguardHostnameChoices(servers)
-	case constants.VPNUnlimited:
-		servers := allServers.GetVPNUnlimited()
-		countryChoices = constants.VPNUnlimitedCountryChoices(servers)
-		cityChoices = constants.VPNUnlimitedCityChoices(servers)
-		hostnameChoices = constants.VPNUnlimitedHostnameChoices(servers)
-	case constants.Vyprvpn:
-		servers := allServers.GetVyprvpn()
-		regionChoices = constants.VyprvpnRegionChoices(servers)
-	case constants.Wevpn:
-		servers := allServers.GetWevpn()
-		cityChoices = constants.WevpnCityChoices(servers)
-		hostnameChoices = constants.WevpnHostnameChoices(servers)
-	case constants.Windscribe:
-		servers := allServers.GetWindscribe()
-		regionChoices = constants.WindscribeRegionChoices(servers)
-		cityChoices = constants.WindscribeCityChoices(servers)
-		hostnameChoices = constants.WindscribeHostnameChoices(servers)
-	default:
-		return fmt.Errorf("%w: %s", ErrVPNProviderNameNotValid, vpnServiceProvider)
-	}
-
-	err = validateServerFilters(*ss, countryChoices, regionChoices, cityChoices,
-		ispChoices, nameChoices, hostnameChoices)
-	if err != nil {
-		return err // already wrapped error
-	}
-
-	if ss.VPN == constants.OpenVPN {
-		err = ss.OpenVPN.validate(vpnServiceProvider)
-		if err != nil {
-			return fmt.Errorf("OpenVPN server selection settings validation failed: %w", err)
-		}
-	} else {
-		err = ss.Wireguard.validate(vpnServiceProvider)
-		if err != nil {
-			return fmt.Errorf("Wireguard server selection settings validation failed: %w", err)
-		}
-	}
-
-	return nil
-}
-
-// validateServerFilters validates filters against the choices given as arguments.
-// Set an argument to nil to pass the check for a particular filter.
-func validateServerFilters(settings ServerSelection,
-	countryChoices, regionChoices, cityChoices, ispChoices,
-	nameChoices, hostnameChoices []string) (err error) {
-	if countryChoices != nil {
-		if err := helpers.AreAllOneOf(settings.Countries, countryChoices); err != nil {
-			return fmt.Errorf("%w: %s", ErrCountryNotValid, err)
-		}
-	}
-
-	if regionChoices != nil {
-		if err := helpers.AreAllOneOf(settings.Regions, regionChoices); err != nil {
-			return fmt.Errorf("%w: %s", ErrRegionNotValid, err)
-		}
-	}
-
-	if cityChoices != nil {
-		if err := helpers.AreAllOneOf(settings.Cities, cityChoices); err != nil {
-			return fmt.Errorf("%w: %s", ErrCityNotValid, err)
-		}
-	}
-
-	if ispChoices != nil {
-		if err := helpers.AreAllOneOf(settings.ISPs, ispChoices); err != nil {
-			return fmt.Errorf("%w: %s", ErrISPNotValid, err)
-		}
-	}
-
-	if hostnameChoices != nil {
-		if err := helpers.AreAllOneOf(settings.Hostnames, hostnameChoices); err != nil {
-			return fmt.Errorf("%w: %s", ErrHostnameNotValid, err)
-		}
-	}
-
-	if nameChoices != nil {
-		if err := helpers.AreAllOneOf(settings.Names, nameChoices); err != nil {
-			return fmt.Errorf("%w: %s", ErrNameNotValid, err)
-		}
-	}
-
-	return nil
-}
-
-func (ss *ServerSelection) copy() (copied ServerSelection) {
-	return ServerSelection{
-		VPN:          ss.VPN,
-		TargetIP:     helpers.CopyIP(ss.TargetIP),
-		Countries:    helpers.CopyStringSlice(ss.Countries),
-		Regions:      helpers.CopyStringSlice(ss.Regions),
-		Cities:       helpers.CopyStringSlice(ss.Cities),
-		ISPs:         helpers.CopyStringSlice(ss.ISPs),
-		Hostnames:    helpers.CopyStringSlice(ss.Hostnames),
-		Names:        helpers.CopyStringSlice(ss.Names),
-		Numbers:      helpers.CopyUint16Slice(ss.Numbers),
-		OwnedOnly:    helpers.CopyBoolPtr(ss.OwnedOnly),
-		FreeOnly:     helpers.CopyBoolPtr(ss.FreeOnly),
-		StreamOnly:   helpers.CopyBoolPtr(ss.StreamOnly),
-		MultiHopOnly: helpers.CopyBoolPtr(ss.MultiHopOnly),
-		OpenVPN:      ss.OpenVPN.copy(),
-		Wireguard:    ss.Wireguard.copy(),
-	}
-}
-
-func (ss *ServerSelection) mergeWith(other ServerSelection) {
-	ss.VPN = helpers.MergeWithString(ss.VPN, other.VPN)
-	ss.TargetIP = helpers.MergeWithIP(ss.TargetIP, other.TargetIP)
-	ss.Countries = helpers.MergeStringSlices(ss.Countries, other.Countries)
-	ss.Regions = helpers.MergeStringSlices(ss.Regions, other.Regions)
-	ss.Cities = helpers.MergeStringSlices(ss.Cities, other.Cities)
-	ss.ISPs = helpers.MergeStringSlices(ss.ISPs, other.ISPs)
-	ss.Hostnames = helpers.MergeStringSlices(ss.Hostnames, other.Hostnames)
-	ss.Names = helpers.MergeStringSlices(ss.Names, other.Names)
-	ss.Numbers = helpers.MergeUint16Slices(ss.Numbers, other.Numbers)
-	ss.OwnedOnly = helpers.MergeWithBool(ss.OwnedOnly, other.OwnedOnly)
-	ss.FreeOnly = helpers.MergeWithBool(ss.FreeOnly, other.FreeOnly)
-	ss.StreamOnly = helpers.MergeWithBool(ss.StreamOnly, other.StreamOnly)
-	ss.MultiHopOnly = helpers.MergeWithBool(ss.MultiHopOnly, other.MultiHopOnly)
-
-	ss.OpenVPN.mergeWith(other.OpenVPN)
-	ss.Wireguard.mergeWith(other.Wireguard)
-}
-
-func (ss *ServerSelection) overrideWith(other ServerSelection) {
-	ss.VPN = helpers.OverrideWithString(ss.VPN, other.VPN)
-	ss.TargetIP = helpers.OverrideWithIP(ss.TargetIP, other.TargetIP)
-	ss.Countries = helpers.OverrideWithStringSlice(ss.Countries, other.Countries)
-	ss.Regions = helpers.OverrideWithStringSlice(ss.Regions, other.Regions)
-	ss.Cities = helpers.OverrideWithStringSlice(ss.Cities, other.Cities)
-	ss.ISPs = helpers.OverrideWithStringSlice(ss.ISPs, other.ISPs)
-	ss.Hostnames = helpers.OverrideWithStringSlice(ss.Hostnames, other.Hostnames)
-	ss.Names = helpers.OverrideWithStringSlice(ss.Names, other.Names)
-	ss.Numbers = helpers.OverrideWithUint16Slice(ss.Numbers, other.Numbers)
-	ss.OwnedOnly = helpers.OverrideWithBool(ss.OwnedOnly, other.OwnedOnly)
-	ss.FreeOnly = helpers.OverrideWithBool(ss.FreeOnly, other.FreeOnly)
-	ss.StreamOnly = helpers.OverrideWithBool(ss.StreamOnly, other.StreamOnly)
-	ss.MultiHopOnly = helpers.OverrideWithBool(ss.MultiHopOnly, other.MultiHopOnly)
-	ss.OpenVPN.overrideWith(other.OpenVPN)
-	ss.Wireguard.overrideWith(other.Wireguard)
-}
-
-func (ss *ServerSelection) setDefaults(vpnProvider string) {
-	ss.VPN = helpers.DefaultString(ss.VPN, constants.OpenVPN)
-	ss.TargetIP = helpers.DefaultIP(ss.TargetIP, net.IP{})
-	ss.OwnedOnly = helpers.DefaultBool(ss.OwnedOnly, false)
-	ss.FreeOnly = helpers.DefaultBool(ss.FreeOnly, false)
-	ss.StreamOnly = helpers.DefaultBool(ss.StreamOnly, false)
-	ss.MultiHopOnly = helpers.DefaultBool(ss.MultiHopOnly, false)
-	ss.OpenVPN.setDefaults(vpnProvider)
-	ss.Wireguard.setDefaults()
-}
-
-func (ss ServerSelection) String() string {
-	return ss.toLinesNode().String()
-}
-
-func (ss ServerSelection) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("Server selection settings:")
-	node.Appendf("VPN type: %s", ss.VPN)
-	if len(ss.TargetIP) > 0 {
-		node.Appendf("Target IP address: %s", ss.TargetIP)
-	}
-
-	if len(ss.Countries) > 0 {
-		node.Appendf("Countries: %s", strings.Join(ss.Countries, ", "))
-	}
-
-	if len(ss.Regions) > 0 {
-		node.Appendf("Regions: %s", strings.Join(ss.Regions, ", "))
-	}
-
-	if len(ss.Cities) > 0 {
-		node.Appendf("Cities: %s", strings.Join(ss.Cities, ", "))
-	}
-
-	if len(ss.ISPs) > 0 {
-		node.Appendf("ISPs: %s", strings.Join(ss.ISPs, ", "))
-	}
-
-	if len(ss.Names) > 0 {
-		node.Appendf("Server names: %s", strings.Join(ss.Names, ", "))
-	}
-
-	if len(ss.Numbers) > 0 {
-		numbersNode := node.Appendf("Server numbers:")
-		for _, number := range ss.Numbers {
-			numbersNode.Appendf("%d", number)
-		}
-	}
-
-	if len(ss.Hostnames) > 0 {
-		node.Appendf("Hostnames: %s", strings.Join(ss.Hostnames, ", "))
-	}
-
-	if *ss.OwnedOnly {
-		node.Appendf("Owned only servers: yes")
-	}
-
-	if *ss.FreeOnly {
-		node.Appendf("Free only servers: yes")
-	}
-
-	if *ss.StreamOnly {
-		node.Appendf("Stream only servers: yes")
-	}
-
-	if *ss.MultiHopOnly {
-		node.Appendf("Multi-hop only servers: yes")
-	}
-
-	if ss.VPN == constants.OpenVPN {
-		node.AppendNode(ss.OpenVPN.toLinesNode())
-	} else {
-		node.AppendNode(ss.Wireguard.toLinesNode())
-	}
-
-	return node
-}
-
-// WithDefaults is a shorthand using setDefaults.
-// It's used in unit tests in other packages.
-func (ss ServerSelection) WithDefaults(provider string) ServerSelection {
-	ss.setDefaults(provider)
-	return ss
-}
--- a/internal/configuration/settings/settings.go
+++ b/internal/configuration/settings/settings.go
@@ -1,147 +0,0 @@
-package settings
-
-import (
-	"fmt"
-
-	"github.com/qdm12/gluetun/internal/models"
-	"github.com/qdm12/gotree"
-)
-
-type Settings struct {
-	ControlServer ControlServer
-	DNS           DNS
-	Firewall      Firewall
-	Health        Health
-	HTTPProxy     HTTPProxy
-	Log           Log
-	PublicIP      PublicIP
-	Shadowsocks   Shadowsocks
-	System        System
-	Updater       Updater
-	Version       Version
-	VPN           VPN
-}
-
-// Validate validates all the settings and returns an error
-// if one of them is not valid.
-// TODO v4 remove pointer for receiver (because of Surfshark).
-func (s *Settings) Validate(allServers models.AllServers) (err error) {
-	nameToValidation := map[string]func() error{
-		"control server":  s.ControlServer.validate,
-		"dns":             s.DNS.validate,
-		"firewall":        s.Firewall.validate,
-		"health":          s.Health.Validate,
-		"http proxy":      s.HTTPProxy.validate,
-		"log":             s.Log.validate,
-		"public ip check": s.PublicIP.validate,
-		"shadowsocks":     s.Shadowsocks.validate,
-		"system":          s.System.validate,
-		"updater":         s.Updater.Validate,
-		"version":         s.Version.validate,
-		"VPN": func() error {
-			return s.VPN.validate(allServers)
-		},
-	}
-
-	for name, validation := range nameToValidation {
-		err = validation()
-		if err != nil {
-			return fmt.Errorf("failed validating %s settings: %w", name, err)
-		}
-	}
-
-	return nil
-}
-
-func (s *Settings) copy() (copied Settings) {
-	return Settings{
-		ControlServer: s.ControlServer.copy(),
-		DNS:           s.DNS.Copy(),
-		Firewall:      s.Firewall.copy(),
-		Health:        s.Health.copy(),
-		HTTPProxy:     s.HTTPProxy.copy(),
-		Log:           s.Log.copy(),
-		PublicIP:      s.PublicIP.copy(),
-		Shadowsocks:   s.Shadowsocks.copy(),
-		System:        s.System.copy(),
-		Updater:       s.Updater.copy(),
-		Version:       s.Version.copy(),
-		VPN:           s.VPN.copy(),
-	}
-}
-
-func (s *Settings) MergeWith(other Settings) {
-	s.ControlServer.mergeWith(other.ControlServer)
-	s.DNS.mergeWith(other.DNS)
-	s.Firewall.mergeWith(other.Firewall)
-	s.Health.MergeWith(other.Health)
-	s.HTTPProxy.mergeWith(other.HTTPProxy)
-	s.Log.mergeWith(other.Log)
-	s.PublicIP.mergeWith(other.PublicIP)
-	s.Shadowsocks.mergeWith(other.Shadowsocks)
-	s.System.mergeWith(other.System)
-	s.Updater.mergeWith(other.Updater)
-	s.Version.mergeWith(other.Version)
-	s.VPN.mergeWith(other.VPN)
-}
-
-func (s *Settings) OverrideWith(other Settings,
-	allServers models.AllServers) (err error) {
-	patchedSettings := s.copy()
-	patchedSettings.ControlServer.overrideWith(other.ControlServer)
-	patchedSettings.DNS.overrideWith(other.DNS)
-	patchedSettings.Firewall.overrideWith(other.Firewall)
-	patchedSettings.Health.OverrideWith(other.Health)
-	patchedSettings.HTTPProxy.overrideWith(other.HTTPProxy)
-	patchedSettings.Log.overrideWith(other.Log)
-	patchedSettings.PublicIP.overrideWith(other.PublicIP)
-	patchedSettings.Shadowsocks.overrideWith(other.Shadowsocks)
-	patchedSettings.System.overrideWith(other.System)
-	patchedSettings.Updater.overrideWith(other.Updater)
-	patchedSettings.Version.overrideWith(other.Version)
-	patchedSettings.VPN.overrideWith(other.VPN)
-	err = patchedSettings.Validate(allServers)
-	if err != nil {
-		return err
-	}
-	*s = patchedSettings
-	return nil
-}
-
-func (s *Settings) SetDefaults() {
-	s.ControlServer.setDefaults()
-	s.DNS.setDefaults()
-	s.Firewall.setDefaults()
-	s.Health.SetDefaults()
-	s.HTTPProxy.setDefaults()
-	s.Log.setDefaults()
-	s.PublicIP.setDefaults()
-	s.Shadowsocks.setDefaults()
-	s.System.setDefaults()
-	s.Updater.SetDefaults()
-	s.Version.setDefaults()
-	s.VPN.setDefaults()
-}
-
-func (s Settings) String() string {
-	return s.toLinesNode().String()
-}
-
-func (s Settings) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("Settings summary:")
-
-	node.AppendNode(s.VPN.toLinesNode())
-	node.AppendNode(s.DNS.toLinesNode())
-	node.AppendNode(s.Firewall.toLinesNode())
-	node.AppendNode(s.Log.toLinesNode())
-	node.AppendNode(s.Health.toLinesNode())
-	node.AppendNode(s.Shadowsocks.toLinesNode())
-	node.AppendNode(s.HTTPProxy.toLinesNode())
-	node.AppendNode(s.ControlServer.toLinesNode())
-	node.AppendNode(s.System.toLinesNode())
-	node.AppendNode(s.PublicIP.toLinesNode())
-	node.AppendNode(s.Updater.toLinesNode())
-	node.AppendNode(s.Version.toLinesNode())
-
-	return node
-}
--- a/internal/configuration/settings/settings_test.go
+++ b/internal/configuration/settings/settings_test.go
@@ -1,101 +0,0 @@
-package settings
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func Test_Settings_String(t *testing.T) {
-	t.Parallel()
-
-	withDefaults := func(s Settings) Settings {
-		s.SetDefaults()
-		return s
-	}
-
-	testCases := map[string]struct {
-		settings Settings
-		s        string
-	}{
-		"default settings": {
-			settings: withDefaults(Settings{}),
-			s: `Settings summary:
-├── VPN settings:
-|   ├── VPN provider settings:
-|   |   ├── Name: private internet access
-|   |   └── Server selection settings:
-|   |       ├── VPN type: openvpn
-|   |       └── OpenVPN server selection settings:
-|   |           ├── Protocol: UDP
-|   |           └── Private Internet Access encryption preset: strong
-|   └── OpenVPN settings:
-|       ├── OpenVPN version: 2.5
-|       ├── User: [not set]
-|       ├── Password: [not set]
-|       ├── Private Internet Access encryption preset: strong
-|       ├── Tunnel IPv6: no
-|       ├── Network interface: tun0
-|       ├── Run OpenVPN as: root
-|       └── Verbosity level: 1
-├── DNS settings:
-|   ├── DNS server address to use: 127.0.0.1
-|   ├── Keep existing nameserver(s): no
-|   └── DNS over TLS settings:
-|       ├── Enabled: yes
-|       ├── Update period: every 24h0m0s
-|       ├── Unbound settings:
-|       |   ├── Authoritative servers:
-|       |   |   └── Cloudflare
-|       |   ├── Caching: yes
-|       |   ├── IPv6: no
-|       |   ├── Verbosity level: 1
-|       |   ├── Verbosity details level: 0
-|       |   ├── Validation log level: 0
-|       |   ├── System user: root
-|       |   └── Allowed networks:
-|       |       ├── 0.0.0.0/0
-|       |       └── ::/0
-|       └── DNS filtering settings:
-|           ├── Block malicious: yes
-|           ├── Block ads: no
-|           └── Block surveillance: yes
-├── Firewall settings:
-|   └── Enabled: yes
-├── Log settings:
-|   └── Log level: INFO
-├── Health settings:
-|   ├── Server listening address: 127.0.0.1:9999
-|   ├── Address to ping: github.com
-|   └── VPN wait durations:
-|       ├── Initial duration: 6s
-|       └── Additional duration: 5s
-├── Shadowsocks server settings:
-|   └── Enabled: no
-├── HTTP proxy settings:
-|   └── Enabled: no
-├── Control server settings:
-|   ├── Listening port: 8000
-|   └── Logging: yes
-├── OS Alpine settings:
-|   ├── Process UID: 1000
-|   └── Process GID: 1000
-├── Public IP settings:
-|   ├── Fetching: every 12h0m0s
-|   └── IP file path: /tmp/gluetun/ip
-└── Version settings:
-    └── Enabled: yes`,
-		},
-	}
-
-	for name, testCase := range testCases {
-		testCase := testCase
-		t.Run(name, func(t *testing.T) {
-			t.Parallel()
-
-			s := testCase.settings.String()
-
-			assert.Equal(t, testCase.s, s)
-		})
-	}
-}
--- a/internal/configuration/settings/shadowsocks.go
+++ b/internal/configuration/settings/shadowsocks.go
@@ -1,68 +0,0 @@
-package settings
-
-import (
-	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
-	"github.com/qdm12/gotree"
-	"github.com/qdm12/ss-server/pkg/tcpudp"
-)
-
-// Shadowsocks contains settings to configure the Shadowsocks server.
-type Shadowsocks struct {
-	// Enabled is true if the server should be running.
-	// It defaults to false, and cannot be nil in the internal state.
-	Enabled *bool
-	// Settings are settings for the TCP+UDP server.
-	tcpudp.Settings
-}
-
-func (s Shadowsocks) validate() (err error) {
-	return s.Settings.Validate()
-}
-
-func (s *Shadowsocks) copy() (copied Shadowsocks) {
-	return Shadowsocks{
-		Enabled:  helpers.CopyBoolPtr(s.Enabled),
-		Settings: s.Settings.Copy(),
-	}
-}
-
-// mergeWith merges the other settings into any
-// unset field of the receiver settings object.
-func (s *Shadowsocks) mergeWith(other Shadowsocks) {
-	s.Enabled = helpers.MergeWithBool(s.Enabled, other.Enabled)
-	s.Settings.MergeWith(other.Settings)
-}
-
-// overrideWith overrides fields of the receiver
-// settings object with any field set in the other
-// settings.
-func (s *Shadowsocks) overrideWith(other Shadowsocks) {
-	s.Enabled = helpers.OverrideWithBool(s.Enabled, other.Enabled)
-	s.Settings.OverrideWith(other.Settings)
-}
-
-func (s *Shadowsocks) setDefaults() {
-	s.Enabled = helpers.DefaultBool(s.Enabled, false)
-	s.Settings.SetDefaults()
-}
-
-func (s Shadowsocks) String() string {
-	return s.toLinesNode().String()
-}
-
-func (s Shadowsocks) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("Shadowsocks server settings:")
-
-	node.Appendf("Enabled: %s", helpers.BoolPtrToYesNo(s.Enabled))
-	if !*s.Enabled {
-		return node
-	}
-
-	// TODO have ToLinesNode in qdm12/ss-server
-	node.Appendf("Listening address: %s", s.Address)
-	node.Appendf("Cipher: %s", s.CipherName)
-	node.Appendf("Password: %s", helpers.ObfuscatePassword(*s.Password))
-	node.Appendf("Log addresses: %s", helpers.BoolPtrToYesNo(s.LogAddresses))
-
-	return node
-}
--- a/internal/configuration/settings/surfshark_retro.go
+++ b/internal/configuration/settings/surfshark_retro.go
@@ -1,56 +0,0 @@
-package settings
-
-import (
-	"strings"
-
-	"github.com/qdm12/gluetun/internal/constants"
-	"github.com/qdm12/gluetun/internal/models"
-)
-
-func surfsharkRetroRegion(selection ServerSelection) (
-	updatedSelection ServerSelection) {
-	locationData := constants.SurfsharkLocationData()
-
-	retroToLocation := make(map[string]models.SurfsharkLocationData, len(locationData))
-	for _, data := range locationData {
-		if data.RetroLoc == "" {
-			continue
-		}
-		retroToLocation[strings.ToLower(data.RetroLoc)] = data
-	}
-
-	for i, region := range selection.Regions {
-		location, ok := retroToLocation[region]
-		if !ok {
-			continue
-		}
-		selection.Regions[i] = strings.ToLower(location.Region)
-		selection.Countries = append(selection.Countries, strings.ToLower(location.Country))
-		selection.Cities = append(selection.Cities, strings.ToLower(location.City)) // even empty string
-		selection.Hostnames = append(selection.Hostnames, location.Hostname)
-	}
-
-	selection.Regions = dedupSlice(selection.Regions)
-	selection.Countries = dedupSlice(selection.Countries)
-	selection.Cities = dedupSlice(selection.Cities)
-	selection.Hostnames = dedupSlice(selection.Hostnames)
-
-	return selection
-}
-
-func dedupSlice(slice []string) (deduped []string) {
-	if slice == nil {
-		return nil
-	}
-
-	deduped = make([]string, 0, len(slice))
-	seen := make(map[string]struct{}, len(slice))
-	for _, s := range slice {
-		if _, ok := seen[s]; !ok {
-			seen[s] = struct{}{}
-			deduped = append(deduped, s)
-		}
-	}
-
-	return deduped
-}
--- a/internal/configuration/settings/system.go
+++ b/internal/configuration/settings/system.go
@@ -1,61 +0,0 @@
-package settings
-
-import (
-	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
-	"github.com/qdm12/gotree"
-)
-
-// System contains settings to configure system related elements.
-type System struct {
-	PUID     *uint16
-	PGID     *uint16
-	Timezone string
-}
-
-// Validate validates System settings.
-func (s System) validate() (err error) {
-	return nil
-}
-
-func (s *System) copy() (copied System) {
-	return System{
-		PUID:     helpers.CopyUint16Ptr(s.PUID),
-		PGID:     helpers.CopyUint16Ptr(s.PGID),
-		Timezone: s.Timezone,
-	}
-}
-
-func (s *System) mergeWith(other System) {
-	s.PUID = helpers.MergeWithUint16(s.PUID, other.PUID)
-	s.PGID = helpers.MergeWithUint16(s.PGID, other.PGID)
-	s.Timezone = helpers.MergeWithString(s.Timezone, other.Timezone)
-}
-
-func (s *System) overrideWith(other System) {
-	s.PUID = helpers.OverrideWithUint16(s.PUID, other.PUID)
-	s.PGID = helpers.OverrideWithUint16(s.PGID, other.PGID)
-	s.Timezone = helpers.OverrideWithString(s.Timezone, other.Timezone)
-}
-
-func (s *System) setDefaults() {
-	const defaultID = 1000
-	s.PUID = helpers.DefaultUint16(s.PUID, defaultID)
-	s.PGID = helpers.DefaultUint16(s.PGID, defaultID)
-}
-
-func (s System) String() string {
-	return s.toLinesNode().String()
-}
-
-func (s System) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("OS Alpine settings:")
-
-	node.Appendf("Process UID: %d", *s.PUID)
-	node.Appendf("Process GID: %d", *s.PGID)
-
-	if s.Timezone != "" {
-		node.Appendf("Timezone: %s", s.Timezone)
-	}
-
-	return node
-}
--- a/internal/configuration/settings/unbound.go
+++ b/internal/configuration/settings/unbound.go
@@ -1,193 +0,0 @@
-package settings
-
-import (
-	"errors"
-	"fmt"
-	"net"
-
-	"github.com/qdm12/dns/pkg/provider"
-	"github.com/qdm12/dns/pkg/unbound"
-	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
-	"github.com/qdm12/gotree"
-	"inet.af/netaddr"
-)
-
-// Unbound is settings for the Unbound program.
-type Unbound struct {
-	Providers             []string
-	Caching               *bool
-	IPv6                  *bool
-	VerbosityLevel        *uint8
-	VerbosityDetailsLevel *uint8
-	ValidationLogLevel    *uint8
-	Username              string
-	Allowed               []netaddr.IPPrefix
-}
-
-func (u *Unbound) setDefaults() {
-	if len(u.Providers) == 0 {
-		u.Providers = []string{
-			provider.Cloudflare().String(),
-		}
-	}
-
-	u.Caching = helpers.DefaultBool(u.Caching, true)
-	u.IPv6 = helpers.DefaultBool(u.IPv6, false)
-
-	const defaultVerbosityLevel = 1
-	u.VerbosityLevel = helpers.DefaultUint8(u.VerbosityLevel, defaultVerbosityLevel)
-
-	const defaultVerbosityDetailsLevel = 0
-	u.VerbosityDetailsLevel = helpers.DefaultUint8(u.VerbosityDetailsLevel, defaultVerbosityDetailsLevel)
-
-	const defaultValidationLogLevel = 0
-	u.ValidationLogLevel = helpers.DefaultUint8(u.ValidationLogLevel, defaultValidationLogLevel)
-
-	if u.Allowed == nil {
-		u.Allowed = []netaddr.IPPrefix{
-			netaddr.IPPrefixFrom(netaddr.IPv4(0, 0, 0, 0), 0),
-			netaddr.IPPrefixFrom(netaddr.IPv6Raw([16]byte{}), 0),
-		}
-	}
-
-	u.Username = helpers.DefaultString(u.Username, "root")
-}
-
-var (
-	ErrUnboundVerbosityLevelNotValid        = errors.New("Unbound verbosity level is not valid")
-	ErrUnboundVerbosityDetailsLevelNotValid = errors.New("Unbound verbosity details level is not valid")
-	ErrUnboundValidationLogLevelNotValid    = errors.New("Unbound validation log level is not valid")
-)
-
-func (u Unbound) validate() (err error) {
-	for _, s := range u.Providers {
-		_, err := provider.Parse(s)
-		if err != nil {
-			return err
-		}
-	}
-
-	const maxVerbosityLevel = 5
-	if *u.VerbosityLevel > maxVerbosityLevel {
-		return fmt.Errorf("%w: %d must be between 0 and %d",
-			ErrUnboundVerbosityLevelNotValid,
-			*u.VerbosityLevel,
-			maxVerbosityLevel)
-	}
-
-	const maxVerbosityDetailsLevel = 4
-	if *u.VerbosityDetailsLevel > maxVerbosityDetailsLevel {
-		return fmt.Errorf("%w: %d must be between 0 and %d",
-			ErrUnboundVerbosityDetailsLevelNotValid,
-			*u.VerbosityDetailsLevel,
-			maxVerbosityDetailsLevel)
-	}
-
-	const maxValidationLogLevel = 2
-	if *u.ValidationLogLevel > maxValidationLogLevel {
-		return fmt.Errorf("%w: %d must be between 0 and %d",
-			ErrUnboundValidationLogLevelNotValid,
-			*u.ValidationLogLevel, maxValidationLogLevel)
-	}
-
-	return nil
-}
-
-func (u Unbound) copy() (copied Unbound) {
-	return Unbound{
-		Providers:             helpers.CopyStringSlice(u.Providers),
-		Caching:               helpers.CopyBoolPtr(u.Caching),
-		IPv6:                  helpers.CopyBoolPtr(u.IPv6),
-		VerbosityLevel:        helpers.CopyUint8Ptr(u.VerbosityLevel),
-		VerbosityDetailsLevel: helpers.CopyUint8Ptr(u.VerbosityDetailsLevel),
-		ValidationLogLevel:    helpers.CopyUint8Ptr(u.ValidationLogLevel),
-		Username:              u.Username,
-		Allowed:               helpers.CopyIPPrefixSlice(u.Allowed),
-	}
-}
-
-func (u *Unbound) mergeWith(other Unbound) {
-	u.Providers = helpers.MergeStringSlices(u.Providers, other.Providers)
-	u.Caching = helpers.MergeWithBool(u.Caching, other.Caching)
-	u.IPv6 = helpers.MergeWithBool(u.IPv6, other.IPv6)
-	u.VerbosityLevel = helpers.MergeWithUint8(u.VerbosityLevel, other.VerbosityLevel)
-	u.VerbosityDetailsLevel = helpers.MergeWithUint8(u.VerbosityDetailsLevel, other.VerbosityDetailsLevel)
-	u.ValidationLogLevel = helpers.MergeWithUint8(u.ValidationLogLevel, other.ValidationLogLevel)
-	u.Username = helpers.MergeWithString(u.Username, other.Username)
-	u.Allowed = helpers.MergeIPPrefixesSlices(u.Allowed, other.Allowed)
-}
-
-func (u *Unbound) overrideWith(other Unbound) {
-	u.Providers = helpers.OverrideWithStringSlice(u.Providers, other.Providers)
-	u.Caching = helpers.OverrideWithBool(u.Caching, other.Caching)
-	u.IPv6 = helpers.OverrideWithBool(u.IPv6, other.IPv6)
-	u.VerbosityLevel = helpers.OverrideWithUint8(u.VerbosityLevel, other.VerbosityLevel)
-	u.VerbosityDetailsLevel = helpers.OverrideWithUint8(u.VerbosityDetailsLevel, other.VerbosityDetailsLevel)
-	u.ValidationLogLevel = helpers.OverrideWithUint8(u.ValidationLogLevel, other.ValidationLogLevel)
-	u.Username = helpers.OverrideWithString(u.Username, other.Username)
-	u.Allowed = helpers.OverrideWithIPPrefixesSlice(u.Allowed, other.Allowed)
-}
-
-func (u Unbound) ToUnboundFormat() (settings unbound.Settings, err error) {
-	providers := make([]provider.Provider, len(u.Providers))
-	for i := range providers {
-		providers[i], err = provider.Parse(u.Providers[i])
-		if err != nil {
-			return settings, err
-		}
-	}
-
-	const port = 53
-
-	return unbound.Settings{
-		ListeningPort:         port,
-		IPv4:                  true,
-		Providers:             providers,
-		Caching:               *u.Caching,
-		IPv6:                  *u.IPv6,
-		VerbosityLevel:        *u.VerbosityLevel,
-		VerbosityDetailsLevel: *u.VerbosityDetailsLevel,
-		ValidationLogLevel:    *u.ValidationLogLevel,
-		AccessControl: unbound.AccessControlSettings{
-			Allowed: u.Allowed,
-		},
-		Username: u.Username,
-	}, nil
-}
-
-func (u Unbound) GetFirstPlaintextIPv4() (ipv4 net.IP, err error) {
-	s := u.Providers[0]
-	provider, err := provider.Parse(s)
-	if err != nil {
-		return nil, err
-	}
-
-	return provider.DNS().IPv4[0], nil
-}
-
-func (u Unbound) String() string {
-	return u.toLinesNode().String()
-}
-
-func (u Unbound) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("Unbound settings:")
-
-	authServers := node.Appendf("Authoritative servers:")
-	for _, provider := range u.Providers {
-		authServers.Appendf(provider)
-	}
-
-	node.Appendf("Caching: %s", helpers.BoolPtrToYesNo(u.Caching))
-	node.Appendf("IPv6: %s", helpers.BoolPtrToYesNo(u.IPv6))
-	node.Appendf("Verbosity level: %d", *u.VerbosityLevel)
-	node.Appendf("Verbosity details level: %d", *u.VerbosityDetailsLevel)
-	node.Appendf("Validation log level: %d", *u.ValidationLogLevel)
-	node.Appendf("System user: %s", u.Username)
-
-	allowedNetworks := node.Appendf("Allowed networks:")
-	for _, network := range u.Allowed {
-		allowedNetworks.Appendf(network.String())
-	}
-
-	return node
-}
--- a/internal/configuration/settings/unbound_test.go
+++ b/internal/configuration/settings/unbound_test.go
@@ -1,43 +0,0 @@
-package settings
-
-import (
-	"encoding/json"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-	"inet.af/netaddr"
-)
-
-func Test_Unbound_JSON(t *testing.T) {
-	t.Parallel()
-
-	settings := Unbound{
-		Providers:             []string{"cloudflare"},
-		Caching:               boolPtr(true),
-		IPv6:                  boolPtr(false),
-		VerbosityLevel:        uint8Ptr(1),
-		VerbosityDetailsLevel: nil,
-		ValidationLogLevel:    uint8Ptr(0),
-		Username:              "user",
-		Allowed: []netaddr.IPPrefix{
-			netaddr.IPPrefixFrom(netaddr.IPv4(0, 0, 0, 0), 0),
-			netaddr.IPPrefixFrom(netaddr.IPv6Raw([16]byte{}), 0),
-		},
-	}
-
-	b, err := json.Marshal(settings)
-	require.NoError(t, err)
-
-	const expected = `{"Providers":["cloudflare"],"Caching":true,"IPv6":false,` +
-		`"VerbosityLevel":1,"VerbosityDetailsLevel":null,"ValidationLogLevel":0,` +
-		`"Username":"user","Allowed":["0.0.0.0/0","::/0"]}`
-
-	assert.Equal(t, expected, string(b))
-
-	var resultSettings Unbound
-	err = json.Unmarshal(b, &resultSettings)
-	require.NoError(t, err)
-
-	assert.Equal(t, settings, resultSettings)
-}
--- a/internal/configuration/settings/updater.go
+++ b/internal/configuration/settings/updater.go
@@ -1,117 +0,0 @@
-package settings
-
-import (
-	"fmt"
-	"net"
-	"strings"
-	"time"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
-	"github.com/qdm12/gluetun/internal/constants"
-	"github.com/qdm12/gotree"
-)
-
-// Updater contains settings to configure the VPN
-// server information updater.
-type Updater struct {
-	// Period is the period for which the updater
-	// should run. It can be set to 0 to disable the
-	// updater. It cannot be nil in the internal state.
-	// TODO change to value and add Enabled field.
-	Period *time.Duration
-	// DNSAddress is the DNS server address to use
-	// to resolve VPN server hostnames to IP addresses.
-	// It cannot be nil in the internal state.
-	DNSAddress net.IP
-	// Providers is the list of VPN service providers
-	// to update server information for.
-	Providers []string
-	// CLI is to precise the updater is running in CLI
-	// mode. This is set automatically and cannot be set
-	// by settings sources. It cannot be nil in the
-	// internal state.
-	CLI *bool
-}
-
-func (u Updater) Validate() (err error) {
-	const minPeriod = time.Minute
-	if *u.Period > 0 && *u.Period < minPeriod {
-		return fmt.Errorf("%w: %d must be larger than %s",
-			ErrUpdaterPeriodTooSmall, *u.Period, minPeriod)
-	}
-
-	for i, provider := range u.Providers {
-		valid := false
-		for _, validProvider := range constants.AllProviders() {
-			if validProvider == constants.Custom {
-				continue
-			}
-
-			if provider == validProvider {
-				valid = true
-				break
-			}
-		}
-		if !valid {
-			return fmt.Errorf("%w: %s at index %d",
-				ErrVPNProviderNameNotValid, provider, i)
-		}
-	}
-
-	return nil
-}
-
-func (u *Updater) copy() (copied Updater) {
-	return Updater{
-		Period:     helpers.CopyDurationPtr(u.Period),
-		DNSAddress: helpers.CopyIP(u.DNSAddress),
-		Providers:  helpers.CopyStringSlice(u.Providers),
-		CLI:        u.CLI,
-	}
-}
-
-// mergeWith merges the other settings into any
-// unset field of the receiver settings object.
-func (u *Updater) mergeWith(other Updater) {
-	u.Period = helpers.MergeWithDuration(u.Period, other.Period)
-	u.DNSAddress = helpers.MergeWithIP(u.DNSAddress, other.DNSAddress)
-	u.Providers = helpers.MergeStringSlices(u.Providers, other.Providers)
-	u.CLI = helpers.MergeWithBool(u.CLI, other.CLI)
-}
-
-// overrideWith overrides fields of the receiver
-// settings object with any field set in the other
-// settings.
-func (u *Updater) overrideWith(other Updater) {
-	u.Period = helpers.OverrideWithDuration(u.Period, other.Period)
-	u.DNSAddress = helpers.OverrideWithIP(u.DNSAddress, other.DNSAddress)
-	u.Providers = helpers.OverrideWithStringSlice(u.Providers, other.Providers)
-	u.CLI = helpers.MergeWithBool(u.CLI, other.CLI)
-}
-
-func (u *Updater) SetDefaults() {
-	u.Period = helpers.DefaultDuration(u.Period, 0)
-	u.DNSAddress = helpers.DefaultIP(u.DNSAddress, net.IPv4(1, 1, 1, 1))
-	u.CLI = helpers.DefaultBool(u.CLI, false)
-}
-
-func (u Updater) String() string {
-	return u.toLinesNode().String()
-}
-
-func (u Updater) toLinesNode() (node *gotree.Node) {
-	if *u.Period == 0 {
-		return nil
-	}
-
-	node = gotree.New("Server data updater settings:")
-	node.Appendf("Update period: %s", *u.Period)
-	node.Appendf("DNS address: %s", u.DNSAddress)
-	node.Appendf("Providers to update: %s", strings.Join(u.Providers, ", "))
-
-	if *u.CLI {
-		node.Appendf("CLI mode: enabled")
-	}
-
-	return node
-}
--- a/internal/configuration/settings/version.go
+++ b/internal/configuration/settings/version.go
@@ -1,53 +0,0 @@
-package settings
-
-import (
-	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
-	"github.com/qdm12/gotree"
-)
-
-// Version contains settings to configure the version
-// information fetcher.
-type Version struct {
-	// Enabled is true if the version information should
-	// be fetched from Github.
-	Enabled *bool
-}
-
-func (v Version) validate() (err error) {
-	return nil
-}
-
-func (v *Version) copy() (copied Version) {
-	return Version{
-		Enabled: helpers.CopyBoolPtr(v.Enabled),
-	}
-}
-
-// mergeWith merges the other settings into any
-// unset field of the receiver settings object.
-func (v *Version) mergeWith(other Version) {
-	v.Enabled = helpers.MergeWithBool(v.Enabled, other.Enabled)
-}
-
-// overrideWith overrides fields of the receiver
-// settings object with any field set in the other
-// settings.
-func (v *Version) overrideWith(other Version) {
-	v.Enabled = helpers.OverrideWithBool(v.Enabled, other.Enabled)
-}
-
-func (v *Version) setDefaults() {
-	v.Enabled = helpers.DefaultBool(v.Enabled, true)
-}
-
-func (v Version) String() string {
-	return v.toLinesNode().String()
-}
-
-func (v Version) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("Version settings:")
-
-	node.Appendf("Enabled: %s", helpers.BoolPtrToYesNo(v.Enabled))
-
-	return node
-}
--- a/internal/configuration/settings/vpn.go
+++ b/internal/configuration/settings/vpn.go
@@ -1,98 +0,0 @@
-package settings
-
-import (
-	"fmt"
-	"strings"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
-	"github.com/qdm12/gluetun/internal/constants"
-	"github.com/qdm12/gluetun/internal/models"
-	"github.com/qdm12/gotree"
-)
-
-type VPN struct {
-	// Type is the VPN type and can only be
-	// 'openvpn' or 'wireguard'. It cannot be the
-	// empty string in the internal state.
-	Type      string
-	Provider  Provider
-	OpenVPN   OpenVPN
-	Wireguard Wireguard
-}
-
-// TODO v4 remove pointer for receiver (because of Surfshark).
-func (v *VPN) validate(allServers models.AllServers) (err error) {
-	// Validate Type
-	validVPNTypes := []string{constants.OpenVPN, constants.Wireguard}
-	if !helpers.IsOneOf(v.Type, validVPNTypes...) {
-		return fmt.Errorf("%w: %q and can only be one of %s",
-			ErrVPNTypeNotValid, v.Type, strings.Join(validVPNTypes, ", "))
-	}
-
-	err = v.Provider.validate(v.Type, allServers)
-	if err != nil {
-		return fmt.Errorf("provider settings validation failed: %w", err)
-	}
-
-	if v.Type == constants.OpenVPN {
-		err := v.OpenVPN.validate(*v.Provider.Name)
-		if err != nil {
-			return fmt.Errorf("OpenVPN settings validation failed: %w", err)
-		}
-	} else {
-		err := v.Wireguard.validate(*v.Provider.Name)
-		if err != nil {
-			return fmt.Errorf("Wireguard settings validation failed: %w", err)
-		}
-	}
-
-	return nil
-}
-
-func (v *VPN) copy() (copied VPN) {
-	return VPN{
-		Type:      v.Type,
-		Provider:  v.Provider.copy(),
-		OpenVPN:   v.OpenVPN.copy(),
-		Wireguard: v.Wireguard.copy(),
-	}
-}
-
-func (v *VPN) mergeWith(other VPN) {
-	v.Type = helpers.MergeWithString(v.Type, other.Type)
-	v.Provider.mergeWith(other.Provider)
-	v.OpenVPN.mergeWith(other.OpenVPN)
-	v.Wireguard.mergeWith(other.Wireguard)
-}
-
-func (v *VPN) overrideWith(other VPN) {
-	v.Type = helpers.OverrideWithString(v.Type, other.Type)
-	v.Provider.overrideWith(other.Provider)
-	v.OpenVPN.overrideWith(other.OpenVPN)
-	v.Wireguard.overrideWith(other.Wireguard)
-}
-
-func (v *VPN) setDefaults() {
-	v.Type = helpers.DefaultString(v.Type, constants.OpenVPN)
-	v.Provider.setDefaults()
-	v.OpenVPN.setDefaults(*v.Provider.Name)
-	v.Wireguard.setDefaults()
-}
-
-func (v VPN) String() string {
-	return v.toLinesNode().String()
-}
-
-func (v VPN) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("VPN settings:")
-
-	node.AppendNode(v.Provider.toLinesNode())
-
-	if v.Type == constants.OpenVPN {
-		node.AppendNode(v.OpenVPN.toLinesNode())
-	} else {
-		node.AppendNode(v.Wireguard.toLinesNode())
-	}
-
-	return node
-}
--- a/internal/configuration/settings/wireguard.go
+++ b/internal/configuration/settings/wireguard.go
@@ -1,138 +0,0 @@
-package settings
-
-import (
-	"fmt"
-	"net"
-	"regexp"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
-	"github.com/qdm12/gluetun/internal/constants"
-	"github.com/qdm12/gotree"
-	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
-)
-
-// Wireguard contains settings to configure the Wireguard client.
-type Wireguard struct {
-	// PrivateKey is the Wireguard client peer private key.
-	// It cannot be nil in the internal state.
-	PrivateKey *string
-	// PreSharedKey is the Wireguard pre-shared key.
-	// It can be the empty string to indicate there
-	// is no pre-shared key.
-	// It cannot be nil in the internal state.
-	PreSharedKey *string
-	// Addresses are the Wireguard interface addresses.
-	Addresses []net.IPNet
-	// Interface is the name of the Wireguard interface
-	// to create. It cannot be the empty string in the
-	// internal state.
-	Interface string
-}
-
-var regexpInterfaceName = regexp.MustCompile(`^[a-zA-Z0-9_]+$`)
-
-// Validate validates Wireguard settings.
-// It should only be ran if the VPN type chosen is Wireguard.
-func (w Wireguard) validate(vpnProvider string) (err error) {
-	if !helpers.IsOneOf(vpnProvider,
-		constants.Custom,
-		constants.Ivpn,
-		constants.Mullvad,
-		constants.Windscribe,
-	) {
-		// do not validate for VPN provider not supporting Wireguard
-		return nil
-	}
-
-	// Validate PrivateKey
-	if *w.PrivateKey == "" {
-		return ErrWireguardPrivateKeyNotSet
-	}
-	_, err = wgtypes.ParseKey(*w.PrivateKey)
-	if err != nil {
-		return fmt.Errorf("%w: %s", ErrWireguardPrivateKeyNotValid, err)
-	}
-
-	// Validate PreSharedKey
-	if *w.PreSharedKey != "" { // Note: this is optional
-		_, err = wgtypes.ParseKey(*w.PreSharedKey)
-		if err != nil {
-			return fmt.Errorf("%w: %s", ErrWireguardPreSharedKeyNotValid, err)
-		}
-	}
-
-	// Validate Addresses
-	if len(w.Addresses) == 0 {
-		return ErrWireguardInterfaceAddressNotSet
-	}
-	for i, ipNet := range w.Addresses {
-		if ipNet.IP == nil || ipNet.Mask == nil {
-			return fmt.Errorf("%w: for address at index %d: %s",
-				ErrWireguardInterfaceAddressNotSet, i, ipNet.String())
-		}
-	}
-
-	// Validate interface
-	if !regexpInterfaceName.MatchString(w.Interface) {
-		return fmt.Errorf("%w: '%s' does not match regex '%s'",
-			ErrWireguardInterfaceNotValid, w.Interface, regexpInterfaceName)
-	}
-
-	return nil
-}
-
-func (w *Wireguard) copy() (copied Wireguard) {
-	return Wireguard{
-		PrivateKey:   helpers.CopyStringPtr(w.PrivateKey),
-		PreSharedKey: helpers.CopyStringPtr(w.PreSharedKey),
-		Addresses:    helpers.CopyIPNetSlice(w.Addresses),
-		Interface:    w.Interface,
-	}
-}
-
-func (w *Wireguard) mergeWith(other Wireguard) {
-	w.PrivateKey = helpers.MergeWithStringPtr(w.PrivateKey, other.PrivateKey)
-	w.PreSharedKey = helpers.MergeWithStringPtr(w.PreSharedKey, other.PreSharedKey)
-	w.Addresses = helpers.MergeIPNetsSlices(w.Addresses, other.Addresses)
-	w.Interface = helpers.MergeWithString(w.Interface, other.Interface)
-}
-
-func (w *Wireguard) overrideWith(other Wireguard) {
-	w.PrivateKey = helpers.OverrideWithStringPtr(w.PrivateKey, other.PrivateKey)
-	w.PreSharedKey = helpers.OverrideWithStringPtr(w.PreSharedKey, other.PreSharedKey)
-	w.Addresses = helpers.OverrideWithIPNetsSlice(w.Addresses, other.Addresses)
-	w.Interface = helpers.OverrideWithString(w.Interface, other.Interface)
-}
-
-func (w *Wireguard) setDefaults() {
-	w.PrivateKey = helpers.DefaultStringPtr(w.PrivateKey, "")
-	w.PreSharedKey = helpers.DefaultStringPtr(w.PreSharedKey, "")
-	w.Interface = helpers.DefaultString(w.Interface, "wg0")
-}
-
-func (w Wireguard) String() string {
-	return w.toLinesNode().String()
-}
-
-func (w Wireguard) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("Wireguard settings:")
-
-	if *w.PrivateKey != "" {
-		s := helpers.ObfuscateWireguardKey(*w.PrivateKey)
-		node.Appendf("Private key: %s", s)
-	}
-
-	if *w.PreSharedKey != "" {
-		s := helpers.ObfuscateWireguardKey(*w.PreSharedKey)
-		node.Appendf("Pre-shared key: %s", s)
-	}
-
-	addressesNode := node.Appendf("Interface addresses:")
-	for _, address := range w.Addresses {
-		addressesNode.Appendf(address.String())
-	}
-
-	node.Appendf("Network interface: %s", w.Interface)
-
-	return node
-}
--- a/internal/configuration/settings/wireguardselection.go
+++ b/internal/configuration/settings/wireguardselection.go
@@ -1,144 +0,0 @@
-package settings
-
-import (
-	"fmt"
-	"net"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings/helpers"
-	"github.com/qdm12/gluetun/internal/constants"
-	"github.com/qdm12/gotree"
-	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
-)
-
-type WireguardSelection struct {
-	// EndpointIP is the server endpoint IP address.
-	// It is only used with VPN providers generating Wireguard
-	// configurations specific to each server and user.
-	// To indicate it should not be used, it should be set
-	// to the empty net.IP{} slice. It can never be nil
-	// in the internal state.
-	EndpointIP net.IP
-	// EndpointPort is a the server port to use for the VPN server.
-	// It is optional for VPN providers IVPN, Mullvad
-	// and Windscribe, and compulsory for the others.
-	// When optional, it can be set to 0 to indicate not use
-	// a custom endpoint port. It cannot be nil in the internal
-	// state.
-	EndpointPort *uint16
-	// PublicKey is the server public key.
-	// It is only used with VPN providers generating Wireguard
-	// configurations specific to each server and user.
-	PublicKey string
-}
-
-// Validate validates WireguardSelection settings.
-// It should only be ran if the VPN type chosen is Wireguard.
-func (w WireguardSelection) validate(vpnProvider string) (err error) {
-	// Validate EndpointIP
-	switch vpnProvider {
-	case constants.Ivpn, constants.Mullvad, constants.Windscribe: // endpoint IP addresses are baked in
-	case constants.Custom:
-		if len(w.EndpointIP) == 0 {
-			return ErrWireguardEndpointIPNotSet
-		}
-	default: // Providers not supporting Wireguard
-	}
-
-	// Validate EndpointPort
-	switch vpnProvider {
-	// EndpointPort is required
-	case constants.Custom:
-		if *w.EndpointPort == 0 {
-			return ErrWireguardEndpointPortNotSet
-		}
-	case constants.Ivpn, constants.Mullvad, constants.Windscribe:
-		// EndpointPort is optional and can be 0
-		if *w.EndpointPort == 0 {
-			break // no custom endpoint port set
-		}
-		if vpnProvider == constants.Mullvad {
-			break // no restriction on custom endpoint port value
-		}
-		var allowed []uint16
-		switch vpnProvider {
-		case constants.Ivpn:
-			allowed = []uint16{2049, 2050, 53, 30587, 41893, 48574, 58237}
-		case constants.Windscribe:
-			allowed = []uint16{53, 80, 123, 443, 1194, 65142}
-		}
-
-		if helpers.Uint16IsOneOf(*w.EndpointPort, allowed) {
-			break
-		}
-		return fmt.Errorf("%w: %d for VPN service provider %s; %s",
-			ErrWireguardEndpointPortNotAllowed, w.EndpointPort, vpnProvider,
-			helpers.PortChoicesOrString(allowed))
-	default: // Providers not supporting Wireguard
-	}
-
-	// Validate PublicKey
-	switch vpnProvider {
-	case constants.Ivpn, constants.Mullvad, constants.Windscribe: // public keys are baked in
-	case constants.Custom:
-		if w.PublicKey == "" {
-			return ErrWireguardPublicKeyNotSet
-		}
-	default: // Providers not supporting Wireguard
-	}
-	if w.PublicKey != "" {
-		_, err := wgtypes.ParseKey(w.PublicKey)
-		if err != nil {
-			return fmt.Errorf("%w: %s: %s",
-				ErrWireguardPublicKeyNotValid, w.PublicKey, err)
-		}
-	}
-
-	return nil
-}
-
-func (w *WireguardSelection) copy() (copied WireguardSelection) {
-	return WireguardSelection{
-		EndpointIP:   helpers.CopyIP(w.EndpointIP),
-		EndpointPort: helpers.CopyUint16Ptr(w.EndpointPort),
-		PublicKey:    w.PublicKey,
-	}
-}
-
-func (w *WireguardSelection) mergeWith(other WireguardSelection) {
-	w.EndpointIP = helpers.MergeWithIP(w.EndpointIP, other.EndpointIP)
-	w.EndpointPort = helpers.MergeWithUint16(w.EndpointPort, other.EndpointPort)
-	w.PublicKey = helpers.MergeWithString(w.PublicKey, other.PublicKey)
-}
-
-func (w *WireguardSelection) overrideWith(other WireguardSelection) {
-	w.EndpointIP = helpers.OverrideWithIP(w.EndpointIP, other.EndpointIP)
-	w.EndpointPort = helpers.OverrideWithUint16(w.EndpointPort, other.EndpointPort)
-	w.PublicKey = helpers.OverrideWithString(w.PublicKey, other.PublicKey)
-}
-
-func (w *WireguardSelection) setDefaults() {
-	w.EndpointIP = helpers.DefaultIP(w.EndpointIP, net.IP{})
-	w.EndpointPort = helpers.DefaultUint16(w.EndpointPort, 0)
-}
-
-func (w WireguardSelection) String() string {
-	return w.toLinesNode().String()
-}
-
-func (w WireguardSelection) toLinesNode() (node *gotree.Node) {
-	node = gotree.New("Wireguard selection settings:")
-
-	if len(w.EndpointIP) > 0 {
-		node.Appendf("Endpoint IP address: %s", w.EndpointIP)
-	}
-
-	if *w.EndpointPort != 0 {
-		node.Appendf("Endpoint port: %d", *w.EndpointPort)
-	}
-
-	if w.PublicKey != "" {
-		node.Appendf("Server public key: %s", w.PublicKey)
-	}
-
-	return node
-}
--- a/internal/configuration/sources/env/dns.go
+++ b/internal/configuration/sources/env/dns.go
@@ -1,51 +0,0 @@
-package env
-
-import (
-	"fmt"
-	"net"
-	"os"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings"
-)
-
-func (r *Reader) readDNS() (dns settings.DNS, err error) {
-	dns.ServerAddress, err = r.readDNSServerAddress()
-	if err != nil {
-		return dns, err
-	}
-
-	dns.KeepNameserver, err = envToBoolPtr("DNS_KEEP_NAMESERVER")
-	if err != nil {
-		return dns, fmt.Errorf("environment variable DNS_KEEP_NAMESERVER: %w", err)
-	}
-
-	dns.DoT, err = r.readDoT()
-	if err != nil {
-		return dns, fmt.Errorf("cannot read DoT settings: %w", err)
-	}
-
-	return dns, nil
-}
-
-func (r *Reader) readDNSServerAddress() (address net.IP, err error) {
-	s := os.Getenv("DNS_PLAINTEXT_ADDRESS")
-	if s == "" {
-		return nil, nil
-	}
-
-	address = net.ParseIP(s)
-	if address == nil {
-		return nil, fmt.Errorf("environment variable DNS_PLAINTEXT_ADDRESS: %w: %s", ErrIPAddressParse, s)
-	}
-
-	// TODO remove in v4
-	if !address.Equal(net.IPv4(127, 0, 0, 1)) { //nolint:gomnd
-		r.warner.Warn("DNS_PLAINTEXT_ADDRESS is set to " + s +
-			" so the DNS over TLS (DoT) server will not be used." +
-			" The default value changed to 127.0.0.1 so it uses the internal DoT server." +
-			" If the DoT server fails to start, the IPv4 address of the first plaintext DNS server" +
-			" corresponding to the first DoT provider chosen is used.")
-	}
-
-	return address, nil
-}
--- a/internal/configuration/sources/env/dnsblacklist.go
+++ b/internal/configuration/sources/env/dnsblacklist.go
@@ -1,90 +0,0 @@
-package env
-
-import (
-	"errors"
-	"fmt"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings"
-	"inet.af/netaddr"
-)
-
-func (r *Reader) readDNSBlacklist() (blacklist settings.DNSBlacklist, err error) {
-	blacklist.BlockMalicious, err = envToBoolPtr("BLOCK_MALICIOUS")
-	if err != nil {
-		return blacklist, fmt.Errorf("environment variable BLOCK_MALICIOUS: %w", err)
-	}
-
-	blacklist.BlockSurveillance, err = r.readBlockSurveillance()
-	if err != nil {
-		return blacklist, fmt.Errorf("environment variable BLOCK_MALICIOUS: %w", err)
-	}
-
-	blacklist.BlockAds, err = envToBoolPtr("BLOCK_ADS")
-	if err != nil {
-		return blacklist, fmt.Errorf("environment variable BLOCK_ADS: %w", err)
-	}
-
-	blacklist.AddBlockedIPs, blacklist.AddBlockedIPPrefixes,
-		err = readDoTPrivateAddresses() // TODO v4 split in 2
-	if err != nil {
-		return blacklist, err
-	}
-
-	blacklist.AllowedHosts = envToCSV("UNBLOCK") // TODO v4 change name
-
-	return blacklist, nil
-}
-
-func (r *Reader) readBlockSurveillance() (blocked *bool, err error) {
-	blocked, err = envToBoolPtr("BLOCK_SURVEILLANCE")
-	if err != nil {
-		return nil, fmt.Errorf("environment variable BLOCK_SURVEILLANCE: %w", err)
-	} else if blocked != nil {
-		return blocked, nil
-	}
-
-	blocked, err = envToBoolPtr("BLOCK_NSA")
-	if err != nil {
-		return nil, fmt.Errorf("environment variable BLOCK_NSA: %w", err)
-	} else if blocked != nil {
-		r.onRetroActive("BLOCK_NSA", "BLOCK_SURVEILLANCE")
-		return blocked, nil
-	}
-
-	return nil, nil //nolint:nilnil
-}
-
-var (
-	ErrPrivateAddressNotValid = errors.New("private address is not a valid IP or CIDR range")
-)
-
-func readDoTPrivateAddresses() (ips []netaddr.IP,
-	ipPrefixes []netaddr.IPPrefix, err error) {
-	privateAddresses := envToCSV("DOT_PRIVATE_ADDRESS")
-	if len(privateAddresses) == 0 {
-		return nil, nil, nil
-	}
-
-	ips = make([]netaddr.IP, 0, len(privateAddresses))
-	ipPrefixes = make([]netaddr.IPPrefix, 0, len(privateAddresses))
-
-	for _, privateAddress := range privateAddresses {
-		ip, err := netaddr.ParseIP(privateAddress)
-		if err == nil {
-			ips = append(ips, ip)
-			continue
-		}
-
-		ipPrefix, err := netaddr.ParseIPPrefix(privateAddress)
-		if err == nil {
-			ipPrefixes = append(ipPrefixes, ipPrefix)
-			continue
-		}
-
-		return nil, nil, fmt.Errorf(
-			"environment variable DOT_PRIVATE_ADDRESS: %w: %s",
-			ErrPrivateAddressNotValid, privateAddress)
-	}
-
-	return ips, ipPrefixes, nil
-}
--- a/internal/configuration/sources/env/dot.go
+++ b/internal/configuration/sources/env/dot.go
@@ -1,31 +0,0 @@
-package env
-
-import (
-	"fmt"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings"
-)
-
-func (r *Reader) readDoT() (dot settings.DoT, err error) {
-	dot.Enabled, err = envToBoolPtr("DOT")
-	if err != nil {
-		return dot, fmt.Errorf("environment variable DOT: %w", err)
-	}
-
-	dot.UpdatePeriod, err = envToDurationPtr("DNS_UPDATE_PERIOD")
-	if err != nil {
-		return dot, fmt.Errorf("environment variable DNS_UPDATE_PERIOD: %w", err)
-	}
-
-	dot.Unbound, err = readUnbound()
-	if err != nil {
-		return dot, err
-	}
-
-	dot.Blacklist, err = r.readDNSBlacklist()
-	if err != nil {
-		return dot, err
-	}
-
-	return dot, nil
-}
--- a/internal/configuration/sources/env/firewall.go
+++ b/internal/configuration/sources/env/firewall.go
@@ -1,96 +0,0 @@
-package env
-
-import (
-	"errors"
-	"fmt"
-	"net"
-	"strconv"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings"
-)
-
-func (r *Reader) readFirewall() (firewall settings.Firewall, err error) {
-	vpnInputPortStrings := envToCSV("FIREWALL_VPN_INPUT_PORTS")
-	firewall.VPNInputPorts, err = stringsToPorts(vpnInputPortStrings)
-	if err != nil {
-		return firewall, fmt.Errorf("environment variable FIREWALL_VPN_INPUT_PORTS: %w", err)
-	}
-
-	inputPortStrings := envToCSV("FIREWALL_INPUT_PORTS")
-	firewall.InputPorts, err = stringsToPorts(inputPortStrings)
-	if err != nil {
-		return firewall, fmt.Errorf("environment variable FIREWALL_INPUT_PORTS: %w", err)
-	}
-
-	outboundSubnetsKey := "FIREWALL_OUTBOUND_SUBNETS"
-	outboundSubnetStrings := envToCSV(outboundSubnetsKey)
-	if len(outboundSubnetStrings) == 0 {
-		// Retro-compatibility
-		outboundSubnetStrings = envToCSV("EXTRA_SUBNETS")
-		if len(outboundSubnetStrings) > 0 {
-			outboundSubnetsKey = "EXTRA_SUBNETS"
-			r.onRetroActive("EXTRA_SUBNETS", "FIREWALL_OUTBOUND_SUBNETS")
-		}
-	}
-	firewall.OutboundSubnets, err = stringsToIPNets(outboundSubnetStrings)
-	if err != nil {
-		return firewall, fmt.Errorf("environment variable %s: %w", outboundSubnetsKey, err)
-	}
-
-	firewall.Enabled, err = envToBoolPtr("FIREWALL")
-	if err != nil {
-		return firewall, fmt.Errorf("environment variable FIREWALL: %w", err)
-	}
-
-	firewall.Debug, err = envToBoolPtr("FIREWALL_DEBUG")
-	if err != nil {
-		return firewall, fmt.Errorf("environment variable FIREWALL_DEBUG: %w", err)
-	}
-
-	return firewall, nil
-}
-
-var (
-	ErrPortParsing = errors.New("cannot parse port")
-	ErrPortValue   = errors.New("port value is not valid")
-)
-
-func stringsToPorts(ss []string) (ports []uint16, err error) {
-	if len(ss) == 0 {
-		return nil, nil
-	}
-	ports = make([]uint16, len(ss))
-	for i, s := range ss {
-		port, err := strconv.Atoi(s)
-		if err != nil {
-			return nil, fmt.Errorf("%w: %s: %s",
-				ErrPortParsing, s, err)
-		} else if port < 1 || port > 65535 {
-			return nil, fmt.Errorf("%w: must be between 1 and 65535: %d",
-				ErrPortValue, port)
-		}
-		ports[i] = uint16(port)
-	}
-	return ports, nil
-}
-
-var (
-	ErrIPNetParsing = errors.New("cannot parse IP network")
-)
-
-func stringsToIPNets(ss []string) (ipNets []net.IPNet, err error) {
-	if len(ss) == 0 {
-		return nil, nil
-	}
-	ipNets = make([]net.IPNet, len(ss))
-	for i, s := range ss {
-		ip, ipNet, err := net.ParseCIDR(s)
-		if err != nil {
-			return nil, fmt.Errorf("%w: %s: %s",
-				ErrIPNetParsing, s, err)
-		}
-		ipNet.IP = ip
-		ipNets[i] = *ipNet
-	}
-	return ipNets, nil
-}
--- a/internal/configuration/sources/env/health.go
+++ b/internal/configuration/sources/env/health.go
@@ -1,52 +0,0 @@
-package env
-
-import (
-	"fmt"
-	"os"
-	"time"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings"
-)
-
-func (r *Reader) ReadHealth() (health settings.Health, err error) {
-	health.ServerAddress = os.Getenv("HEALTH_SERVER_ADDRESS")
-	health.AddressToPing = os.Getenv("HEALTH_ADDRESS_TO_PING")
-
-	health.VPN.Initial, err = r.readDurationWithRetro(
-		"HEALTH_VPN_DURATION_INITIAL",
-		"HEALTH_OPENVPN_DURATION_INITIAL")
-	if err != nil {
-		return health, err
-	}
-
-	health.VPN.Initial, err = r.readDurationWithRetro(
-		"HEALTH_VPN_DURATION_ADDITION",
-		"HEALTH_OPENVPN_DURATION_ADDITION")
-	if err != nil {
-		return health, err
-	}
-
-	return health, nil
-}
-
-func (r *Reader) readDurationWithRetro(envKey, retroEnvKey string) (d *time.Duration, err error) {
-	s := os.Getenv(envKey)
-	if s == "" {
-		s = os.Getenv(retroEnvKey)
-		if s == "" {
-			return nil, nil //nolint:nilnil
-		}
-		r.onRetroActive(envKey, retroEnvKey)
-		envKey = retroEnvKey
-	}
-
-	d = new(time.Duration)
-	*d, err = time.ParseDuration(s)
-	if err != nil {
-		return nil, fmt.Errorf(
-			"environment variable %s: %w",
-			envKey, err)
-	}
-
-	return d, nil
-}
--- a/internal/configuration/sources/env/helpers.go
+++ b/internal/configuration/sources/env/helpers.go
@@ -1,134 +0,0 @@
-package env
-
-import (
-	"encoding/base64"
-	"errors"
-	"fmt"
-	"os"
-	"strconv"
-	"strings"
-	"time"
-
-	"github.com/qdm12/govalid/binary"
-	"github.com/qdm12/govalid/integer"
-)
-
-func envToCSV(envKey string) (values []string) {
-	csv := os.Getenv(envKey)
-	if csv == "" {
-		return nil
-	}
-	return lowerAndSplit(csv)
-}
-
-func envToStringPtr(envKey string) (stringPtr *string) {
-	s := os.Getenv(envKey)
-	if s == "" {
-		return nil
-	}
-	return &s
-}
-
-func envToBoolPtr(envKey string) (boolPtr *bool, err error) {
-	s := os.Getenv(envKey)
-	if s == "" {
-		return nil, nil //nolint:nilnil
-	}
-	value, err := binary.Validate(s)
-	if err != nil {
-		return nil, err
-	}
-	return &value, nil
-}
-
-func envToIntPtr(envKey string) (intPtr *int, err error) {
-	s := os.Getenv(envKey)
-	if s == "" {
-		return nil, nil //nolint:nilnil
-	}
-	value, err := strconv.Atoi(s)
-	if err != nil {
-		return nil, err
-	}
-	return &value, nil
-}
-
-func envToUint8Ptr(envKey string) (uint8Ptr *uint8, err error) {
-	s := os.Getenv(envKey)
-	if s == "" {
-		return nil, nil //nolint:nilnil
-	}
-
-	const min, max = 0, 255
-	value, err := integer.Validate(s, integer.OptionRange(min, max))
-	if err != nil {
-		return nil, err
-	}
-
-	uint8Ptr = new(uint8)
-	*uint8Ptr = uint8(value)
-	return uint8Ptr, nil
-}
-
-func envToUint16Ptr(envKey string) (uint16Ptr *uint16, err error) {
-	s := os.Getenv(envKey)
-	if s == "" {
-		return nil, nil //nolint:nilnil
-	}
-
-	const min, max = 0, 65535
-	value, err := integer.Validate(s, integer.OptionRange(min, max))
-	if err != nil {
-		return nil, err
-	}
-
-	uint16Ptr = new(uint16)
-	*uint16Ptr = uint16(value)
-	return uint16Ptr, nil
-}
-
-func envToDurationPtr(envKey string) (durationPtr *time.Duration, err error) {
-	s := os.Getenv(envKey)
-	if s == "" {
-		return nil, nil //nolint:nilnil
-	}
-
-	durationPtr = new(time.Duration)
-	*durationPtr, err = time.ParseDuration(s)
-	if err != nil {
-		return nil, err
-	}
-
-	return durationPtr, nil
-}
-
-func lowerAndSplit(csv string) (values []string) {
-	csv = strings.ToLower(csv)
-	return strings.Split(csv, ",")
-}
-
-var ErrDecodeBase64 = errors.New("cannot decode base64 string")
-
-func decodeBase64(b64String string) (decoded string, err error) {
-	b, err := base64.StdEncoding.DecodeString(b64String)
-	if err != nil {
-		return "", fmt.Errorf("%w: %s: %s",
-			ErrDecodeBase64, b64String, err)
-	}
-	return string(b), nil
-}
-
-func unsetEnvKeys(envKeys []string, err error) (newErr error) {
-	newErr = err
-	for _, envKey := range envKeys {
-		unsetErr := os.Unsetenv(envKey)
-		if unsetErr != nil && newErr == nil {
-			newErr = fmt.Errorf("cannot unset environment variable %s: %w", envKey, unsetErr)
-		}
-	}
-	return newErr
-}
-
-func stringPtr(s string) *string { return &s }
-func uint16Ptr(n uint16) *uint16 { return &n }
-func boolPtr(b bool) *bool       { return &b }
--- a/internal/configuration/sources/env/helpers_test.go
+++ b/internal/configuration/sources/env/helpers_test.go
@@ -1,22 +0,0 @@
-package env
-
-import (
-	"os"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-)
-
-// setTestEnv is used to set environment variables in
-// parallel tests.
-func setTestEnv(t *testing.T, key, value string) {
-	t.Helper()
-	existing := os.Getenv(key)
-	err := os.Setenv(key, value) //nolint:tenv
-	t.Cleanup(func() {
-		err = os.Setenv(key, existing)
-		assert.NoError(t, err)
-	})
-	require.NoError(t, err)
-}
--- a/internal/configuration/sources/env/httproxy.go
+++ b/internal/configuration/sources/env/httproxy.go
@@ -1,170 +0,0 @@
-package env
-
-import (
-	"fmt"
-	"os"
-	"strings"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings"
-	"github.com/qdm12/govalid/binary"
-)
-
-func (r *Reader) readHTTPProxy() (httpProxy settings.HTTPProxy, err error) {
-	httpProxy.User = r.readHTTProxyUser()
-	httpProxy.Password = r.readHTTProxyPassword()
-	httpProxy.ListeningAddress = r.readHTTProxyListeningAddress()
-
-	httpProxy.Enabled, err = r.readHTTProxyEnabled()
-	if err != nil {
-		return httpProxy, err
-	}
-
-	httpProxy.Stealth, err = envToBoolPtr("HTTPPROXY_STEALTH")
-	if err != nil {
-		return httpProxy, fmt.Errorf("environment variable HTTPPROXY_STEALTH: %w", err)
-	}
-
-	httpProxy.Log, err = r.readHTTProxyLog()
-	if err != nil {
-		return httpProxy, err
-	}
-
-	return httpProxy, nil
-}
-
-func (r *Reader) readHTTProxyUser() (user *string) {
-	s := os.Getenv("HTTPPROXY_USER")
-	if s != "" {
-		return &s
-	}
-
-	// Retro-compatibility
-	s = os.Getenv("TINYPROXY_USER")
-	if s != "" {
-		r.onRetroActive("TINYPROXY_USER", "HTTPPROXY_USER")
-		return &s
-	}
-
-	// Retro-compatibility
-	s = os.Getenv("PROXY_USER")
-	if s != "" {
-		r.onRetroActive("PROXY_USER", "HTTPPROXY_USER")
-		return &s
-	}
-
-	return nil
-}
-
-func (r *Reader) readHTTProxyPassword() (user *string) {
-	s := os.Getenv("HTTPPROXY_PASSWORD")
-	if s != "" {
-		return &s
-	}
-
-	// Retro-compatibility
-	s = os.Getenv("TINYPROXY_PASSWORD")
-	if s != "" {
-		r.onRetroActive("TINYPROXY_PASSWORD", "HTTPPROXY_PASSWORD")
-		return &s
-	}
-
-	// Retro-compatibility
-	s = os.Getenv("PROXY_PASSWORD")
-	if s != "" {
-		r.onRetroActive("PROXY_PASSWORD", "HTTPPROXY_PASSWORD")
-		return &s
-	}
-
-	return nil
-}
-
-func (r *Reader) readHTTProxyListeningAddress() (listeningAddress string) {
-	// Retro-compatibility
-	retroKeys := []string{"PROXY_PORT", "TINYPROXY_PORT", "HTTPPROXY_PORT"}
-	for _, retroKey := range retroKeys {
-		s := os.Getenv(retroKey)
-		if s != "" {
-			r.onRetroActive(retroKey, "HTTPPROXY_LISTENING_ADDRESS")
-			return ":" + s
-		}
-	}
-
-	return os.Getenv("HTTPPROXY_LISTENING_ADDRESS")
-}
-
-func (r *Reader) readHTTProxyEnabled() (enabled *bool, err error) {
-	s := strings.ToLower(os.Getenv("HTTPPROXY"))
-	if s != "" {
-		enabled = new(bool)
-		*enabled, err = binary.Validate(s)
-		if err != nil {
-			return nil, fmt.Errorf("environment variable HTTPPROXY: %w", err)
-		}
-		return enabled, nil
-	}
-
-	// Retro-compatibility
-	s = strings.ToLower(os.Getenv("TINYPROXY"))
-	if s != "" {
-		r.onRetroActive("TINYPROXY", "HTTPPROXY")
-		enabled = new(bool)
-		*enabled, err = binary.Validate(s)
-		if err != nil {
-			return nil, fmt.Errorf("environment variable TINYPROXY: %w", err)
-		}
-		return enabled, nil
-	}
-
-	// Retro-compatibility
-	s = strings.ToLower(os.Getenv("PROXY"))
-	if s != "" {
-		r.onRetroActive("PROXY", "HTTPPROXY")
-		enabled = new(bool)
-		*enabled, err = binary.Validate(s)
-		if err != nil {
-			return nil, fmt.Errorf("environment variable PROXY: %w", err)
-		}
-		return enabled, nil
-	}
-
-	return nil, nil //nolint:nilnil
-}
-
-func (r *Reader) readHTTProxyLog() (enabled *bool, err error) {
-	s := strings.ToLower(os.Getenv("HTTPPROXY_LOG"))
-	if s != "" {
-		enabled = new(bool)
-		*enabled, err = binary.Validate(s)
-		if err != nil {
-			return nil, fmt.Errorf("environment variable HTTPPROXY_LOG: %w", err)
-		}
-		return enabled, nil
-	}
-
-	// Retro-compatibility
-	retroOption := binary.OptionEnabled("on", "info", "connect", "notice")
-	s = strings.ToLower(os.Getenv("TINYPROXY_LOG"))
-	if s != "" {
-		r.onRetroActive("TINYPROXY_LOG", "HTTPPROXY_LOG")
-		enabled = new(bool)
-		*enabled, err = binary.Validate(s, retroOption)
-		if err != nil {
-			return nil, fmt.Errorf("environment variable TINYPROXY_LOG: %w", err)
-		}
-		return enabled, nil
-	}
-
-	// Retro-compatibility
-	s = strings.ToLower(os.Getenv("PROXY_LOG_LEVEL"))
-	if s != "" {
-		r.onRetroActive("PROXY_LOG_LEVEL", "HTTPPROXY_LOG")
-		enabled = new(bool)
-		*enabled, err = binary.Validate(s, retroOption)
-		if err != nil {
-			return nil, fmt.Errorf("environment variable PROXY_LOG_LEVEL: %w", err)
-		}
-		return enabled, nil
-	}
-
-	return nil, nil //nolint:nilnil
-}
--- a/internal/configuration/sources/env/log.go
+++ b/internal/configuration/sources/env/log.go
@@ -1,54 +0,0 @@
-package env
-
-import (
-	"errors"
-	"fmt"
-	"os"
-	"strings"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings"
-	"github.com/qdm12/golibs/logging"
-)
-
-func readLog() (log settings.Log, err error) {
-	log.Level, err = readLogLevel()
-	if err != nil {
-		return log, err
-	}
-
-	return log, nil
-}
-
-func readLogLevel() (level *logging.Level, err error) {
-	s := os.Getenv("LOG_LEVEL")
-	if s == "" {
-		return nil, nil //nolint:nilnil
-	}
-
-	level = new(logging.Level)
-	*level, err = parseLogLevel(s)
-	if err != nil {
-		return nil, fmt.Errorf("environment variable LOG_LEVEL: %w", err)
-	}
-
-	return level, nil
-}
-
-var ErrLogLevelUnknown = errors.New("log level is unknown")
-
-func parseLogLevel(s string) (level logging.Level, err error) {
-	switch strings.ToLower(s) {
-	case "debug":
-		return logging.LevelDebug, nil
-	case "info":
-		return logging.LevelInfo, nil
-	case "warning":
-		return logging.LevelWarn, nil
-	case "error":
-		return logging.LevelError, nil
-	default:
-		return level, fmt.Errorf(
-			"%w: %s: can be one of: debug, info, warning or error",
-			ErrLogLevelUnknown, s)
-	}
-}
--- a/internal/configuration/sources/env/openvpn.go
+++ b/internal/configuration/sources/env/openvpn.go
@@ -1,125 +0,0 @@
-package env
-
-import (
-	"fmt"
-	"os"
-	"strings"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings"
-)
-
-func (r *Reader) readOpenVPN() (
-	openVPN settings.OpenVPN, err error) {
-	defer func() {
-		err = unsetEnvKeys([]string{"OPENVPN_CLIENTKEY", "OPENVPN_CLIENTCRT"}, err)
-	}()
-
-	openVPN.Version = os.Getenv("OPENVPN_VERSION")
-	openVPN.User = r.readOpenVPNUser()
-	openVPN.Password = r.readOpenVPNPassword()
-	confFile := os.Getenv("OPENVPN_CUSTOM_CONFIG")
-	if confFile != "" {
-		openVPN.ConfFile = &confFile
-	}
-
-	openVPN.Ciphers = envToCSV("OPENVPN_CIPHER")
-	auth := os.Getenv("OPENVPN_AUTH")
-	if auth != "" {
-		openVPN.Auth = &auth
-	}
-
-	openVPN.ClientCrt, err = readBase64OrNil("OPENVPN_CLIENTCRT")
-	if err != nil {
-		return openVPN, fmt.Errorf("environment variable OPENVPN_CLIENTCRT: %w", err)
-	}
-
-	openVPN.ClientKey, err = readBase64OrNil("OPENVPN_CLIENTKEY")
-	if err != nil {
-		return openVPN, fmt.Errorf("environment variable OPENVPN_CLIENTKEY: %w", err)
-	}
-
-	openVPN.PIAEncPreset = r.readPIAEncryptionPreset()
-
-	openVPN.IPv6, err = envToBoolPtr("OPENVPN_IPV6")
-	if err != nil {
-		return openVPN, fmt.Errorf("environment variable OPENVPN_IPV6: %w", err)
-	}
-
-	openVPN.MSSFix, err = envToUint16Ptr("OPENVPN_MSSFIX")
-	if err != nil {
-		return openVPN, fmt.Errorf("environment variable OPENVPN_MSSFIX: %w", err)
-	}
-
-	openVPN.Interface = os.Getenv("OPENVPN_INTERFACE")
-
-	openVPN.Root, err = envToBoolPtr("OPENVPN_ROOT")
-	if err != nil {
-		return openVPN, fmt.Errorf("environment variable OPENVPN_ROOT: %w", err)
-	}
-
-	// TODO ProcUser once Root is deprecated.
-
-	openVPN.Verbosity, err = envToIntPtr("OPENVPN_VERBOSITY")
-	if err != nil {
-		return openVPN, fmt.Errorf("environment variable OPENVPN_VERBOSITY: %w", err)
-	}
-
-	return openVPN, nil
-}
-
-func (r *Reader) readOpenVPNUser() (user string) {
-	user = os.Getenv("OPENVPN_USER")
-	if user == "" {
-		// Retro-compatibility
-		user = os.Getenv("USER")
-		if user != "" {
-			r.onRetroActive("USER", "OPENVPN_USER")
-		}
-	}
-	// Remove spaces in user ID to simplify user's life, thanks @JeordyR
-	return strings.ReplaceAll(user, " ", "")
-}
-
-func (r *Reader) readOpenVPNPassword() (password string) {
-	password = os.Getenv("OPENVPN_PASSWORD")
-	if password != "" {
-		return password
-	}
-
-	// Retro-compatibility
-	password = os.Getenv("PASSWORD")
-	if password != "" {
-		r.onRetroActive("PASSWORD", "OPENVPN_PASSWORD")
-	}
-	return password
-}
-
-func readBase64OrNil(envKey string) (valueOrNil *string, err error) {
-	value := os.Getenv(envKey)
-	if value == "" {
-		return nil, nil //nolint:nilnil
-	}
-
-	decoded, err := decodeBase64(value)
-	if err != nil {
-		return nil, err
-	}
-
-	return &decoded, nil
-}
-
-func (r *Reader) readPIAEncryptionPreset() (presetPtr *string) {
-	preset := strings.ToLower(os.Getenv("PIA_ENCRYPTION"))
-	if preset != "" {
-		return &preset
-	}
-
-	// Retro-compatibility
-	preset = strings.ToLower(os.Getenv("ENCRYPTION"))
-	if preset != "" {
-		r.onRetroActive("ENCRYPTION", "PIA_ENCRYPTION")
-		return &preset
-	}
-
-	return nil
-}
--- a/internal/configuration/sources/env/openvpnselection.go
+++ b/internal/configuration/sources/env/openvpnselection.go
@@ -1,83 +0,0 @@
-package env
-
-import (
-	"errors"
-	"fmt"
-	"os"
-	"strings"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings"
-	"github.com/qdm12/gluetun/internal/constants"
-	"github.com/qdm12/govalid/port"
-)
-
-func (r *Reader) readOpenVPNSelection() (
-	selection settings.OpenVPNSelection, err error) {
-	confFile := os.Getenv("OPENVPN_CUSTOM_CONFIG")
-	if confFile != "" {
-		selection.ConfFile = &confFile
-	}
-
-	selection.TCP, err = r.readOpenVPNProtocol()
-	if err != nil {
-		return selection, err
-	}
-
-	selection.CustomPort, err = r.readOpenVPNCustomPort()
-	if err != nil {
-		return selection, err
-	}
-
-	selection.PIAEncPreset = r.readPIAEncryptionPreset()
-
-	return selection, nil
-}
-
-var ErrOpenVPNProtocolNotValid = errors.New("OpenVPN protocol is not valid")
-
-func (r *Reader) readOpenVPNProtocol() (tcp *bool, err error) {
-	envKey := "OPENVPN_PROTOCOL"
-	protocol := strings.ToLower(os.Getenv("OPENVPN_PROTOCOL"))
-	if protocol == "" {
-		// Retro-compatibility
-		protocol = strings.ToLower(os.Getenv("PROTOCOL"))
-		if protocol != "" {
-			envKey = "PROTOCOL"
-			r.onRetroActive("PROTOCOL", "OPENVPN_PROTOCOL")
-		}
-	}
-
-	switch protocol {
-	case "":
-		return nil, nil //nolint:nilnil
-	case constants.UDP:
-		return boolPtr(false), nil
-	case constants.TCP:
-		return boolPtr(true), nil
-	default:
-		return nil, fmt.Errorf("environment variable %s: %w: %s",
-			envKey, ErrOpenVPNProtocolNotValid, protocol)
-	}
-}
-
-func (r *Reader) readOpenVPNCustomPort() (customPort *uint16, err error) {
-	key := "OPENVPN_PORT"
-	s := os.Getenv(key)
-	if s == "" {
-		// Retro-compatibility
-		key = "PORT"
-		s = os.Getenv(key)
-		if s == "" {
-			return nil, nil //nolint:nilnil
-		}
-		r.onRetroActive("PORT", "OPENVPN_PORT")
-	}
-
-	customPort = new(uint16)
-	*customPort, err = port.Validate(s)
-	if err != nil {
-		return nil, fmt.Errorf("environment variable %s: %w", key, err)
-	}
-
-	return customPort, nil
-}
--- a/internal/configuration/sources/env/portforward.go
+++ b/internal/configuration/sources/env/portforward.go
@@ -1,19 +0,0 @@
-package env
-
-import (
-	"fmt"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings"
-)
-
-func readPortForward() (
-	portForwarding settings.PortForwarding, err error) {
-	portForwarding.Enabled, err = envToBoolPtr("PORT_FORWARDING")
-	if err != nil {
-		return portForwarding, fmt.Errorf("environment variable PORT_FORWARDING: %w", err)
-	}
-
-	portForwarding.Filepath = envToStringPtr("PORT_FORWARDING_STATUS_FILE")
-
-	return portForwarding, nil
-}
--- a/internal/configuration/sources/env/provider.go
+++ b/internal/configuration/sources/env/provider.go
@@ -1,44 +0,0 @@
-package env
-
-import (
-	"fmt"
-	"os"
-	"strings"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings"
-	"github.com/qdm12/gluetun/internal/constants"
-)
-
-func (r *Reader) readProvider(vpnType string) (provider settings.Provider, err error) {
-	provider.Name = readVPNServiceProvider(vpnType)
-	var providerName string
-	if provider.Name != nil {
-		providerName = *provider.Name
-	}
-
-	provider.ServerSelection, err = r.readServerSelection(providerName, vpnType)
-	if err != nil {
-		return provider, fmt.Errorf("cannot read server selection settings: %w", err)
-	}
-
-	provider.PortForwarding, err = readPortForward()
-	if err != nil {
-		return provider, fmt.Errorf("cannot read port forwarding settings: %w", err)
-	}
-
-	return provider, nil
-}
-
-func readVPNServiceProvider(vpnType string) (vpnProviderPtr *string) {
-	s := strings.ToLower(os.Getenv("VPNSP"))
-	switch {
-	case vpnType != constants.Wireguard &&
-		os.Getenv("OPENVPN_CUSTOM_CONFIG") != "": // retro compatibility
-		return stringPtr(constants.Custom)
-	case s == "":
-		return nil
-	case s == "pia": // retro compatibility
-		return stringPtr(constants.PrivateInternetAccess)
-	}
-	return stringPtr(s)
-}
--- a/internal/configuration/sources/env/publicip.go
+++ b/internal/configuration/sources/env/publicip.go
@@ -1,51 +0,0 @@
-package env
-
-import (
-	"fmt"
-	"os"
-	"time"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings"
-)
-
-func (r *Reader) readPublicIP() (publicIP settings.PublicIP, err error) {
-	publicIP.Period, err = readPublicIPPeriod()
-	if err != nil {
-		return publicIP, err
-	}
-
-	publicIP.IPFilepath = r.readPublicIPFilepath()
-
-	return publicIP, nil
-}
-
-func readPublicIPPeriod() (period *time.Duration, err error) {
-	s := os.Getenv("PUBLICIP_PERIOD")
-	if s == "" {
-		return nil, nil //nolint:nilnil
-	}
-
-	period = new(time.Duration)
-	*period, err = time.ParseDuration(s)
-	if err != nil {
-		return nil, fmt.Errorf("environment variable PUBLICIP_PERIOD: %w", err)
-	}
-
-	return period, nil
-}
-
-func (r *Reader) readPublicIPFilepath() (filepath *string) {
-	s := os.Getenv("PUBLICIP_FILE")
-	if s != "" {
-		return &s
-	}
-
-	// Retro-compatibility
-	s = os.Getenv("IP_STATUS_FILE")
-	if s != "" {
-		r.onRetroActive("IP_STATUS_FILE", "PUBLICIP_FILE")
-		return &s
-	}
-
-	return nil
-}
--- a/internal/configuration/sources/env/reader.go
+++ b/internal/configuration/sources/env/reader.go
@@ -1,92 +0,0 @@
-package env
-
-import (
-	"github.com/qdm12/gluetun/internal/configuration/settings"
-	"github.com/qdm12/gluetun/internal/configuration/sources"
-)
-
-var _ sources.Source = (*Reader)(nil)
-
-type Reader struct {
-	warner Warner
-}
-
-type Warner interface {
-	Warn(s string)
-}
-
-func New(warner Warner) *Reader {
-	return &Reader{
-		warner: warner,
-	}
-}
-
-func (r *Reader) Read() (settings settings.Settings, err error) {
-	settings.VPN, err = r.readVPN()
-	if err != nil {
-		return settings, err
-	}
-
-	settings.Firewall, err = r.readFirewall()
-	if err != nil {
-		return settings, err
-	}
-
-	settings.System, err = r.readSystem()
-	if err != nil {
-		return settings, err
-	}
-
-	settings.Health, err = r.ReadHealth()
-	if err != nil {
-		return settings, err
-	}
-
-	settings.HTTPProxy, err = r.readHTTPProxy()
-	if err != nil {
-		return settings, err
-	}
-
-	settings.Log, err = readLog()
-	if err != nil {
-		return settings, err
-	}
-
-	settings.PublicIP, err = r.readPublicIP()
-	if err != nil {
-		return settings, err
-	}
-
-	settings.Updater, err = readUpdater()
-	if err != nil {
-		return settings, err
-	}
-
-	settings.Version, err = readVersion()
-	if err != nil {
-		return settings, err
-	}
-
-	settings.Shadowsocks, err = r.readShadowsocks()
-	if err != nil {
-		return settings, err
-	}
-
-	settings.DNS, err = r.readDNS()
-	if err != nil {
-		return settings, err
-	}
-
-	settings.ControlServer, err = readControlServer()
-	if err != nil {
-		return settings, err
-	}
-
-	return settings, nil
-}
-
-func (r *Reader) onRetroActive(oldKey, newKey string) {
-	r.warner.Warn(
-		"You are using the old environment variable " + oldKey +
-			", please consider changing it to " + newKey)
-}
--- a/internal/configuration/sources/env/server.go
+++ b/internal/configuration/sources/env/server.go
@@ -1,53 +0,0 @@
-package env
-
-import (
-	"fmt"
-	"os"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings"
-	"github.com/qdm12/govalid/binary"
-	"github.com/qdm12/govalid/port"
-)
-
-func readControlServer() (controlServer settings.ControlServer, err error) {
-	controlServer.Log, err = readControlServerLog()
-	if err != nil {
-		return controlServer, err
-	}
-
-	controlServer.Port, err = readControlServerPort()
-	if err != nil {
-		return controlServer, err
-	}
-
-	return controlServer, nil
-}
-
-func readControlServerLog() (enabled *bool, err error) {
-	s := os.Getenv("HTTP_CONTROL_SERVER_LOG")
-	if s == "" {
-		return nil, nil //nolint:nilnil
-	}
-
-	log, err := binary.Validate(s)
-	if err != nil {
-		return nil, fmt.Errorf("environment variable HTTP_CONTROL_SERVER_LOG: %w", err)
-	}
-
-	return &log, nil
-}
-
-func readControlServerPort() (p *uint16, err error) {
-	s := os.Getenv("HTTP_CONTROL_SERVER_PORT")
-	if s == "" {
-		return nil, nil //nolint:nilnil
-	}
-
-	p = new(uint16)
-	*p, err = port.Validate(s, port.OptionPortListening(os.Geteuid()))
-	if err != nil {
-		return nil, fmt.Errorf("environment variable HTTP_CONTROL_SERVER_PORT: %w", err)
-	}
-
-	return p, nil
-}
--- a/internal/configuration/sources/env/serverselection.go
+++ b/internal/configuration/sources/env/serverselection.go
@@ -1,115 +0,0 @@
-package env
-
-import (
-	"errors"
-	"fmt"
-	"net"
-	"os"
-	"strconv"
-	"strings"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings"
-	"github.com/qdm12/gluetun/internal/constants"
-)
-
-var (
-	ErrServerNumberNotValid = errors.New("server number is not valid")
-)
-
-func (r *Reader) readServerSelection(vpnProvider, vpnType string) (
-	ss settings.ServerSelection, err error) {
-	ss.VPN = vpnType
-
-	ss.TargetIP, err = readOpenVPNTargetIP()
-	if err != nil {
-		return ss, err
-	}
-
-	countriesCSV := os.Getenv("COUNTRY")
-	if vpnProvider == constants.Cyberghost && countriesCSV == "" {
-		// Retro-compatibility
-		r.onRetroActive("REGION", "COUNTRY")
-		countriesCSV = os.Getenv("REGION")
-	}
-	if countriesCSV != "" {
-		ss.Countries = lowerAndSplit(countriesCSV)
-	}
-
-	ss.Regions = envToCSV("REGION")
-	ss.Cities = envToCSV("CITY")
-	ss.ISPs = envToCSV("ISP")
-	ss.Hostnames = envToCSV("SERVER_HOSTNAME")
-	ss.Names = envToCSV("SERVER_NAME")
-
-	if csv := os.Getenv("SERVER_NUMBER"); csv != "" {
-		numbersStrings := strings.Split(csv, ",")
-		numbers := make([]uint16, len(numbersStrings))
-		for i, numberString := range numbersStrings {
-			number, err := strconv.Atoi(numberString)
-			if err != nil {
-				return ss, fmt.Errorf("%w: %s",
-					ErrServerNumberNotValid, numberString)
-			} else if number < 0 || number > 65535 {
-				return ss, fmt.Errorf("%w: %d must be between 0 and 65535",
-					ErrServerNumberNotValid, number)
-			}
-			numbers[i] = uint16(number)
-		}
-		ss.Numbers = numbers
-	}
-
-	// Mullvad only
-	ss.OwnedOnly, err = envToBoolPtr("OWNED")
-	if err != nil {
-		return ss, fmt.Errorf("environment variable OWNED: %w", err)
-	}
-
-	// VPNUnlimited and ProtonVPN only
-	ss.FreeOnly, err = envToBoolPtr("FREE_ONLY")
-	if err != nil {
-		return ss, fmt.Errorf("environment variable FREE_ONLY: %w", err)
-	}
-
-	// VPNUnlimited only
-	ss.MultiHopOnly, err = envToBoolPtr("MULTIHOP_ONLY")
-	if err != nil {
-		return ss, fmt.Errorf("environment variable MULTIHOP_ONLY: %w", err)
-	}
-
-	// VPNUnlimited only
-	ss.MultiHopOnly, err = envToBoolPtr("STREAM_ONLY")
-	if err != nil {
-		return ss, fmt.Errorf("environment variable STREAM_ONLY: %w", err)
-	}
-
-	ss.OpenVPN, err = r.readOpenVPNSelection()
-	if err != nil {
-		return ss, err
-	}
-
-	ss.Wireguard, err = r.readWireguardSelection()
-	if err != nil {
-		return ss, err
-	}
-
-	return ss, nil
-}
-
-var (
-	ErrInvalidIP = errors.New("invalid IP address")
-)
-
-func readOpenVPNTargetIP() (ip net.IP, err error) {
-	s := os.Getenv("OPENVPN_TARGET_IP")
-	if s == "" {
-		return nil, nil
-	}
-
-	ip = net.ParseIP(s)
-	if ip == nil {
-		return nil, fmt.Errorf("environment variable OPENVPN_TARGET_IP: %w: %s",
-			ErrInvalidIP, s)
-	}
-
-	return ip, nil
-}
--- a/internal/configuration/sources/env/shadowsocks.go
+++ b/internal/configuration/sources/env/shadowsocks.go
@@ -1,54 +0,0 @@
-package env
-
-import (
-	"fmt"
-	"os"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings"
-)
-
-func (r *Reader) readShadowsocks() (shadowsocks settings.Shadowsocks, err error) {
-	shadowsocks.Enabled, err = envToBoolPtr("SHADOWSOCKS")
-	if err != nil {
-		return shadowsocks, fmt.Errorf("environment variable SHADOWSOCKS: %w", err)
-	}
-
-	shadowsocks.Address = r.readShadowsocksAddress()
-	shadowsocks.LogAddresses, err = envToBoolPtr("SHADOWSOCKS_LOG")
-	if err != nil {
-		return shadowsocks, fmt.Errorf("environment variable SHADOWSOCKS_LOG: %w", err)
-	}
-	shadowsocks.CipherName = r.readShadowsocksCipher()
-	shadowsocks.Password = envToStringPtr("SHADOWSOCKS_PASSWORD")
-
-	return shadowsocks, nil
-}
-
-func (r *Reader) readShadowsocksAddress() (address string) {
-	address = os.Getenv("SHADOWSOCKS_LISTENING_ADDRESS")
-	if address != "" {
-		return address
-	}
-
-	// Retro-compatibility
-	portString := os.Getenv("SHADOWSOCKS_PORT")
-	if portString != "" {
-		r.onRetroActive("SHADOWSOCKS_PORT", "SHADOWSOCKS_LISTENING_ADDRESS")
-		return ":" + portString
-	}
-
-	return ""
-}
-
-func (r *Reader) readShadowsocksCipher() (cipher string) {
-	cipher = os.Getenv("SHADOWSOCKS_CIPHER")
-	if cipher != "" {
-		return cipher
-	}
-	// Retro-compatibility
-	cipher = os.Getenv("SHADOWSOCKS_METHOD")
-	if cipher != "" {
-		r.onRetroActive("SHADOWSOCKS_METHOD", "SHADOWSOCKS_CIPHER")
-	}
-	return cipher
-}
--- a/internal/configuration/sources/env/system.go
+++ b/internal/configuration/sources/env/system.go
@@ -1,63 +0,0 @@
-package env
-
-import (
-	"errors"
-	"fmt"
-	"os"
-	"strconv"
-
-	"github.com/qdm12/gluetun/internal/configuration/settings"
-)
-
-var (
-	ErrSystemPUIDNotValid     = errors.New("PUID is not valid")
-	ErrSystemPGIDNotValid     = errors.New("PGID is not valid")
-	ErrSystemTimezoneNotValid = errors.New("timezone is not valid")
-)
-
-func (r *Reader) readSystem() (system settings.System, err error) {
-	system.PUID, err = r.readID("PUID", "UID")
-	if err != nil {
-		return system, err
-	}
-
-	system.PGID, err = r.readID("PGID", "GID")
-	if err != nil {
-		return system, err
-	}
-
-	system.Timezone = os.Getenv("TZ")
-
-	return system, nil
-}
-
-var ErrSystemIDNotValid = errors.New("system ID is not valid")
-
-func (r *Reader) readID(key, retroKey string) (
-	id *uint16, err error) {
-	idEnvKey := key
-	idString := os.Getenv(key)
-	if idString == "" {
-		// retro-compatibility
-		idString = os.Getenv(retroKey)
-		if idString != "" {
-			idEnvKey = retroKey
-			r.onRetroActive(retroKey, key)
-		}
-	}
-
-	if idString == "" {
-		return nil, nil //nolint:nilnil
-	}
-
-	idInt, err := strconv.Atoi(idString)
-	if err != nil {
-		return nil, fmt.Errorf("environment variable %s: %w: %s: %s",
-			idEnvKey, ErrSystemIDNotValid, idString, err)
-	} else if idInt < 0 || idInt > 65535 {
-		return nil, fmt.Errorf("environment variable %s: %w: %d: must be between 0 and 65535",
-			idEnvKey, ErrSystemIDNotValid, idInt)
-	}
-
-	return uint16Ptr(uint16(idInt)), nil
-}
--- a/internal/configuration/sources/env/system_test.go
+++ b/internal/configuration/sources/env/system_test.go
@@ -1,52 +0,0 @@
-package env
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func Test_Reader_readID(t *testing.T) {
-	t.Parallel()
-
-	testCases := map[string]struct {
-		keyPrefix      string
-		keyValue       string
-		retroKeyPrefix string
-		retroValue     string
-		id             *uint16
-		errWrapped     error
-		errMessage     string
-	}{
-		"id 1000": {
-			keyPrefix:      "ID",
-			keyValue:       "1000",
-			retroKeyPrefix: "RETRO_ID",
-			id:             uint16Ptr(1000),
-		},
-	}
-
-	for name, testCase := range testCases {
-		testCase := testCase
-		t.Run(name, func(t *testing.T) {
-			t.Parallel()
-
-			suffix := t.Name()
-			key := testCase.keyPrefix + suffix
-			retroKey := testCase.retroKeyPrefix + suffix
-
-			setTestEnv(t, key, testCase.keyValue)
-			setTestEnv(t, retroKey, testCase.retroValue)
-
-			reader := &Reader{}
-			id, err := reader.readID(key, retroKey)
-
-			assert.ErrorIs(t, err, testCase.errWrapped)
-			if err != nil {
-				assert.EqualError(t, err, testCase.errMessage)
-			}
-
-			assert.Equal(t, testCase.id, id)
-		})
-	}
-}
--- a/Show More
+++ b/Show More