fix: use net module instead of exe os command

This removes the os dependency on host ip detection
This method dials the public dns to see the host IP.
If the host is in a complete private network, it might fail.
In this case, the user could use the input argument to specify host IP

services/services.go

@@ -4,9 +4,9 @@ package services
 import (
 	"errors"
 	"fmt"
+	"net"
 	"net/http"
 	"os"
-	"os/exec"
 	"path/filepath"
 	"strings"
 
@@ -115,15 +115,17 @@ func FindWebUIDistPath(ctx context.Context) (*string, error) {
 func GetHostIp(ctx context.Context) string {
 	logger := klog.FromContext(ctx)
 
-	cmd := exec.Command("hostname", "-I")
-	stdout, err := cmd.Output()
+	conn, err := net.Dial("udp", "8.8.8.8:80")
 	if err != nil {
 		logger.Error(err, ", [WEBUI] unable to retrive cfm-service's ip address")
 		return ""
 	}
-	output := string(stdout[:])
-	addresses := strings.Split(output, " ")
-	return strings.TrimSpace(string(addresses[0]))
+	defer conn.Close()
+
+	localAddr := conn.LocalAddr().(*net.UDPAddr)
+	logger.V(2).Info("[WEBUI] found webui service", "ip addr", localAddr.IP)
+
+	return string(localAddr.IP)
 }
 
 // UpdateBasePath: Replace the base address in the webui distro file