func (rb *HostgwBackend) handleSubnetEvents(batch subnet.EventBatch) { for _, evt := range batch { switch evt.Type { case subnet.SubnetAdded: log.Infof("Subnet added: %v via %v", evt.Lease.Network, evt.Lease.Attrs.PublicIP) if evt.Lease.Attrs.BackendType != "host-gw" { log.Warningf("Ignoring non-host-gw subnet: type=%v", evt.Lease.Attrs.BackendType) continue } route := netlink.Route{ Dst: evt.Lease.Network.ToIPNet(), Gw: evt.Lease.Attrs.PublicIP.ToIP(), LinkIndex: rb.extIface.Index, } if err := netlink.RouteAdd(&route); err != nil { log.Errorf("Error adding route to %v via %v: %v", evt.Lease.Network, evt.Lease.Attrs.PublicIP, err) continue } case subnet.SubnetRemoved: log.Info("Subnet removed: ", evt.Lease.Network) if evt.Lease.Attrs.BackendType != "host-gw" { log.Warningf("Ignoring non-host-gw subnet: type=%v", evt.Lease.Attrs.BackendType) continue } route := netlink.Route{ Dst: evt.Lease.Network.ToIPNet(), Gw: evt.Lease.Attrs.PublicIP.ToIP(), LinkIndex: rb.extIface.Index, } if err := netlink.RouteDel(&route); err != nil { log.Errorf("Error deleting route to %v: %v", evt.Lease.Network, err) continue } default: log.Error("Internal error: unknown event type: ", int(evt.Type)) } } }
func (ipt *IPTables) Exists(table string, args ...string) (bool, error) { checkPresent, err := getIptablesHasCheckCommand() if err != nil { log.Warningf("Error checking iptables version, assuming version at least 1.4.11: %v\n", err) checkPresent = true } if !checkPresent { cmd := append([]string{"-A"}, args...) return existsForOldIpTables(table, strings.Join(cmd, " ")) } else { cmd := append([]string{"-t", table, "-C"}, args...) err = exec.Command(ipt.path, cmd...).Run() } switch { case err == nil: return true, nil case err.(*exec.ExitError).Sys().(syscall.WaitStatus).ExitStatus() == 1: return false, nil default: return false, err } }