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default.go
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default.go
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package routing
import (
"errors"
"fmt"
"net/netip"
"github.com/qdm12/gluetun/internal/netlink"
"golang.org/x/sys/unix"
)
var (
ErrRouteDefaultNotFound = errors.New("default route not found")
)
type DefaultRoute struct {
NetInterface string
Gateway netip.Addr
AssignedIP netip.Addr
Family int
}
func (d DefaultRoute) String() string {
return fmt.Sprintf("interface %s, gateway %s, assigned IP %s and family %s",
d.NetInterface, d.Gateway, d.AssignedIP, netlink.FamilyToString(d.Family))
}
func (r *Routing) DefaultRoutes() (defaultRoutes []DefaultRoute, err error) {
routes, err := r.netLinker.RouteList(netlink.FamilyAll)
if err != nil {
return nil, fmt.Errorf("listing routes: %w", err)
}
for _, route := range routes {
if route.Table != unix.RT_TABLE_MAIN {
// ignore non-main table
continue
}
if route.Dst.IsValid() {
continue
}
defaultRoute := DefaultRoute{
Gateway: route.Gw,
Family: route.Family,
}
linkIndex := route.LinkIndex
link, err := r.netLinker.LinkByIndex(linkIndex)
if err != nil {
return nil, fmt.Errorf("obtaining link by index: for default route at index %d: %w", linkIndex, err)
}
defaultRoute.NetInterface = link.Name
family := netlink.FamilyV6
if route.Gw.Is4() {
family = netlink.FamilyV4
}
defaultRoute.AssignedIP, err = r.assignedIP(defaultRoute.NetInterface, family)
if err != nil {
return nil, fmt.Errorf("getting assigned IP of %s: %w", defaultRoute.NetInterface, err)
}
r.logger.Info("default route found: " + defaultRoute.String())
defaultRoutes = append(defaultRoutes, defaultRoute)
}
if len(defaultRoutes) == 0 {
return nil, fmt.Errorf("%w: in %d route(s)", ErrRouteDefaultNotFound, len(routes))
}
return defaultRoutes, nil
}
func DefaultRoutesInterfaces(defaultRoutes []DefaultRoute) (interfaces []string) {
interfaces = make([]string, len(defaultRoutes))
for i := range defaultRoutes {
interfaces[i] = defaultRoutes[i].NetInterface
}
return interfaces
}