publishing port changes

netclient/functions/localport.go

@@ -0,0 +1,62 @@
+package functions
+
+import (
+	"errors"
+	"log"
+	"strconv"
+	"strings"
+
+	"github.com/gravitl/netmaker/logger"
+	"github.com/gravitl/netmaker/netclient/config"
+	"github.com/gravitl/netmaker/netclient/local"
+	"github.com/gravitl/netmaker/netclient/ncutils"
+)
+
+// Get LocalListenPort - Gets the port running on the local interface
+func GetLocalListenPort(ifacename string) (int32, error) {
+	portstring, err := ncutils.RunCmd("wg show "+ifacename+" listen-port", false)
+	if err != nil {
+		return 0, err
+	}
+	portstring = strings.TrimSuffix(portstring, "\n")
+	i, err := strconv.ParseInt(portstring, 10, 32)
+	if err != nil {
+		return 0, err
+	} else if i == 0 {
+		return 0, errors.New("parsed port is unset or invalid")
+	}
+	return int32(i), nil
+}
+
+func UpdateLocalListenPort(nodeCfg *config.ClientConfig) error {
+	var err error
+	ifacename := getRealIface(nodeCfg.Node.Interface, nodeCfg.Node.Address)
+	localPort, err := GetLocalListenPort(ifacename)
+	if err != nil {
+		logger.Log(1, "error encountered checking local listen port: ", err.Error())
+	} else if nodeCfg.Node.LocalListenPort != localPort && localPort != 0 {
+		logger.Log(1, "local port has changed from ", strconv.Itoa(int(nodeCfg.Node.LocalListenPort)), " to ", strconv.Itoa(int(localPort)))
+		nodeCfg.Node.LocalListenPort = localPort
+		err = config.ModConfig(&nodeCfg.Node)
+		if err != nil {
+			return err
+		}
+		log.Println("server: " + nodeCfg.Server.Server)
+		if err := PublishNodeUpdate(nodeCfg); err != nil {
+			logger.Log(0, "could not publish local port change")
+		}
+	}
+	return err
+}
+
+func getRealIface(ifacename string, address string) string {
+	var deviceiface = ifacename
+	var err error
+	if ncutils.IsMac() { // if node is Mac (Darwin) get the tunnel name first
+		deviceiface, err = local.GetMacIface(address)
+		if err != nil || deviceiface == "" {
+			deviceiface = ifacename
+		}
+	}
+	return deviceiface
+}