121 lines
2.9 KiB
Go
121 lines
2.9 KiB
Go
package routing
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import (
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"errors"
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"fmt"
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"net"
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"github.com/qdm12/gluetun/internal/netlink"
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)
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var (
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ErrLinkLocalNotFound = errors.New("local link not found")
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ErrSubnetDefaultNotFound = errors.New("default subnet not found")
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ErrSubnetLocalNotFound = errors.New("local subnet not found")
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)
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type LocalNetwork struct {
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IPNet *net.IPNet
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InterfaceName string
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IP net.IP
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}
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type LocalSubnetGetter interface {
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LocalSubnet() (defaultSubnet net.IPNet, err error)
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}
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func (r *Routing) LocalSubnet() (defaultSubnet net.IPNet, err error) {
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routes, err := r.netLinker.RouteList(nil, netlink.FAMILY_ALL)
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if err != nil {
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return defaultSubnet, fmt.Errorf("cannot list routes: %w", err)
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}
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defaultLinkIndex := -1
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for _, route := range routes {
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if route.Dst == nil {
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defaultLinkIndex = route.LinkIndex
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break
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}
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}
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if defaultLinkIndex == -1 {
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return defaultSubnet, fmt.Errorf("%w: in %d route(s)", ErrLinkDefaultNotFound, len(routes))
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}
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for _, route := range routes {
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if route.Gw != nil || route.LinkIndex != defaultLinkIndex {
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continue
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}
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defaultSubnet = *route.Dst
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r.logger.Info("local subnet found: " + defaultSubnet.String())
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return defaultSubnet, nil
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}
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return defaultSubnet, fmt.Errorf("%w: in %d routes", ErrSubnetDefaultNotFound, len(routes))
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}
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type LocalNetworksGetter interface {
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LocalNetworks() (localNetworks []LocalNetwork, err error)
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}
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func (r *Routing) LocalNetworks() (localNetworks []LocalNetwork, err error) {
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links, err := r.netLinker.LinkList()
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if err != nil {
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return localNetworks, fmt.Errorf("cannot list links: %w", err)
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}
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localLinks := make(map[int]struct{})
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for _, link := range links {
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if link.Attrs().EncapType != "ether" {
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continue
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}
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localLinks[link.Attrs().Index] = struct{}{}
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r.logger.Info("local ethernet link found: " + link.Attrs().Name)
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}
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if len(localLinks) == 0 {
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return localNetworks, fmt.Errorf("%w: in %d links", ErrLinkLocalNotFound, len(links))
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}
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routes, err := r.netLinker.RouteList(nil, netlink.FAMILY_V4)
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if err != nil {
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return localNetworks, fmt.Errorf("cannot list routes: %w", err)
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}
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for _, route := range routes {
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if route.Gw != nil || route.Dst == nil {
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continue
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} else if _, ok := localLinks[route.LinkIndex]; !ok {
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continue
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}
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var localNet LocalNetwork
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localNet.IPNet = route.Dst
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r.logger.Info("local ipnet found: " + localNet.IPNet.String())
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link, err := r.netLinker.LinkByIndex(route.LinkIndex)
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if err != nil {
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return localNetworks, fmt.Errorf("cannot find link at index %d: %w", route.LinkIndex, err)
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}
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localNet.InterfaceName = link.Attrs().Name
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ip, err := r.assignedIP(localNet.InterfaceName)
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if err != nil {
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return localNetworks, err
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}
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localNet.IP = ip
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localNetworks = append(localNetworks, localNet)
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}
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if len(localNetworks) == 0 {
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return localNetworks, fmt.Errorf("%w: in %d routes", ErrSubnetLocalNotFound, len(routes))
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}
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return localNetworks, nil
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}
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