cephfs: update fetchIP to support ipv6 addresses

Signed-off-by: Riya Singhal <[email protected]>

internal/csi-addons/networkfence/fencing.go

@@ -22,6 +22,7 @@ import (
 	"errors"
 	"fmt"
 	"net"
+	"regexp"
 	"strconv"
 	"strings"
 	"time"
@@ -212,9 +213,13 @@ func (ac *activeClient) fetchIP() (string, error) {
 	clientInfo := ac.Inst
 	parts := strings.Fields(clientInfo)
 	if len(parts) >= 2 {
-		ip := strings.Split(parts[1], ":")[0]
-
-		return ip, nil
+		// use a regular expression to find an IPv4 or IPv6 address in the string
+		ipRegex := `([0-9A-Fa-f]{1,4}:){7}[0-9A-Fa-f]{1,4}|(\d{1,3}\.){3}\d{1,3}`
+		re := regexp.MustCompile(ipRegex)
+		matches := re.FindStringSubmatch(parts[1])
+		if len(matches) > 0 {
+			return matches[0], nil
+		}
 	}
 
 	return "", fmt.Errorf("failed to extract IP address, incorrect format: %s", clientInfo)