fix: ignore loopback ip

cmd/kubevpn/cmds/connect.go

@@ -80,7 +80,7 @@ func CmdConnect(f cmdutil.Factory) *cobra.Command {
 			if err != nil {
 				return err
 			}
-			if !sshConf.IsEmpty() {
+			if !sshConf.IsEmpty() && !sshConf.IsLoopback() {
 				if ip := util.GetAPIServerFromKubeConfigBytes(bytes); ip != nil {
 					extraRoute.ExtraCIDR = append(extraRoute.ExtraCIDR, ip.String())
 				}

cmd/kubevpn/cmds/proxy.go

@@ -106,7 +106,7 @@ func CmdProxy(f cmdutil.Factory) *cobra.Command {
 			if err != nil {
 				return err
 			}
-			if !sshConf.IsEmpty() {
+			if !sshConf.IsEmpty() && !sshConf.IsLoopback() {
 				if ip := util.GetAPIServerFromKubeConfigBytes(bytes); ip != nil {
 					extraRoute.ExtraCIDR = append(extraRoute.ExtraCIDR, ip.String())
 				}

cmd/kubevpn/cmds/sync.go

@@ -94,7 +94,7 @@ func CmdSync(f cmdutil.Factory) *cobra.Command {
 			if err != nil {
 				return err
 			}
-			if !sshConf.IsEmpty() {
+			if !sshConf.IsEmpty() && !sshConf.IsLoopback() {
 				if ip := util.GetAPIServerFromKubeConfigBytes(bytes); ip != nil {
 					extraRoute.ExtraCIDR = append(extraRoute.ExtraCIDR, ip.String())
 				}

pkg/run/options.go

@@ -99,7 +99,7 @@ func (option *Options) Connect(ctx context.Context, sshConfig *pkgssh.SshConfig,
 		if err != nil {
 			return err
 		}
-		if !sshConfig.IsEmpty() {
+		if !sshConfig.IsEmpty() && !sshConfig.IsLoopback() {
 			if ip := util.GetAPIServerFromKubeConfigBytes(kubeConfigBytes); ip != nil {
 				option.ExtraRouteInfo.ExtraCIDR = append(option.ExtraRouteInfo.ExtraCIDR, ip.String())
 			}

pkg/ssh/config.go

@@ -113,6 +113,28 @@ func (conf SshConfig) IsEmpty() bool {
 	return conf.ConfigAlias == "" && conf.Addr == "" && conf.Jump == ""
 }
 
+// IsLoopback TODO support alias and proxyJump
+func (conf SshConfig) IsLoopback() bool {
+	if conf.Addr != "" {
+		var host string
+		var err error
+		if host, _, err = net.SplitHostPort(conf.Addr); err != nil {
+			host = conf.Addr
+		}
+		ip, err := net.LookupIP(host)
+		if err != nil {
+			return false
+		}
+		for _, i := range ip {
+			if i.IsLoopback() {
+				return true
+			}
+		}
+		return false
+	}
+	return false
+}
+
 func (conf SshConfig) GetAuth() ([]ssh.AuthMethod, error) {
 	host, _, _ := net.SplitHostPort(conf.Addr)
 	var auth []ssh.AuthMethod