69 lines
1.9 KiB
Go
69 lines
1.9 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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ErrRouteDefaultNotFound = errors.New("default route not found")
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)
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type DefaultRouteGetter interface {
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DefaultRoute() (defaultInterface string, defaultGateway net.IP, err error)
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}
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func (r *Routing) DefaultRoute() (defaultInterface string, defaultGateway net.IP, 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 "", nil, fmt.Errorf("%w: %s", ErrRoutesList, err)
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}
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for _, route := range routes {
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if route.Dst == nil {
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defaultGateway = route.Gw
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linkIndex := route.LinkIndex
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link, err := r.netLinker.LinkByIndex(linkIndex)
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if err != nil {
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return "", nil, fmt.Errorf("%w: for default route at index %d: %s", ErrLinkByIndex, linkIndex, err)
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}
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attributes := link.Attrs()
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defaultInterface = attributes.Name
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r.logger.Info("default route found: interface " + defaultInterface +
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", gateway " + defaultGateway.String())
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return defaultInterface, defaultGateway, nil
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}
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}
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return "", nil, fmt.Errorf("%w: in %d route(s)", ErrRouteDefaultNotFound, len(routes))
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}
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type DefaultIPGetter interface {
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DefaultIP() (defaultIP net.IP, err error)
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}
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func (r *Routing) DefaultIP() (ip net.IP, 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 nil, fmt.Errorf("%w: %s", ErrRoutesList, err)
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}
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defaultLinkName := ""
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for _, route := range routes {
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if route.Dst == nil {
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linkIndex := route.LinkIndex
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link, err := r.netLinker.LinkByIndex(linkIndex)
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if err != nil {
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return nil, fmt.Errorf("%w: for default route at index %d: %s", ErrLinkByIndex, linkIndex, err)
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}
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defaultLinkName = link.Attrs().Name
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}
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}
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if defaultLinkName == "" {
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return nil, fmt.Errorf("%w: in %d route(s)", ErrLinkDefaultNotFound, len(routes))
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}
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return r.assignedIP(defaultLinkName)
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}
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