58 lines
2.4 KiB
Bash
58 lines
2.4 KiB
Bash
#!/bin/sh
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exitOnError(){
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# $1 must be set to $?
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status=$1
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message=$2
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[ "$message" != "" ] || message="Undefined error"
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if [ $status != 0 ]; then
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printf "[ERROR] $message, with status $status)\n"
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exit $status
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fi
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}
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warnOnError(){
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# $1 must be set to $?
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status=$1
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message=$2
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[ "$message" != "" ] || message="Undefined error"
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if [ $status != 0 ]; then
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printf "[WARNING] $message, with status $status)\n"
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fi
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}
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printf "[INFO] Reading forwarded port\n"
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printf " * Generating client ID...\n"
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client_id=`head -n 100 /dev/urandom | sha256sum | tr -d " -"`
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exitOnError $? "Unable to generate Client ID"
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printf " * Obtaining forward port from PIA server...\n"
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json=`wget -qO- "http://209.222.18.222:2000/?client_id=$client_id"`
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exitOnError $? "Could not obtain response from PIA server (does your PIA server support port forwarding?)"
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if [ "$json" == "" ]; then
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printf "[ERROR] Port forwarding is already activated on this connection, has expired, or you are not connected to a PIA region that supports port forwarding\n"
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exit 1
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fi
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printf " * Parsing JSON response...\n"
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port=`echo $json | jq .port`
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exitOnError $? "Cannot find port in JSON response"
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printf " * Writing forwarded port to file...\n"
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port_status_folder=`dirname "${PORT_FORWARDING_STATUS_FILE}"`
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warnOnError $? "Cannot find parent directory of ${PORT_FORWARDING_STATUS_FILE}"
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mkdir -p "${port_status_folder}"
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warnOnError $? "Cannot create containing directory ${port_status_folder}"
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echo "$port" > "${PORT_FORWARDING_STATUS_FILE}"
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warnOnError $? "Cannot write port to ${PORT_FORWARDING_STATUS_FILE}"
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printf " * Detecting current VPN IP address...\n"
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ip=`wget -qO- https://duckduckgo.com/\?q=ip | grep -oE "\b([0-9]{1,3}\.){3}[0-9]{1,3}\b"`
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warnOnError $? "Cannot detect remote VPN IP on https://duckduckgo.com"
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printf " * Forwarded port accessible at $ip:$port\n"
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printf " * Detecting target VPN interface...\n"
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vpn_device=$(cat /openvpn/target/config.ovpn | grep 'dev ' | cut -d" " -f 2)0
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exitOnError $? "Unable to find VPN interface in /openvpn/target/config.ovpn"
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printf " * Accepting input traffic through $vpn_device to port $port...\n"
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iptables -A INPUT -i $vpn_device -p tcp --dport $port -j ACCEPT
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exitOnError $? "Unable to allow the forwarded port in TCP"
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iptables -A INPUT -i $vpn_device -p udp --dport $port -j ACCEPT
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exitOnError $? "Unable to allow the forwarded port in UDP"
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printf "[INFO] Port forwarded successfully\n"
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