cephFS: fix fetchIP to support more formats

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"
@@ -206,15 +207,32 @@ func isIPInCIDR(ctx context.Context, ip, cidr string) bool {
 	return ipCidr.Contains(ipAddress)
 }
 
+// func (ac *activeClient) fetchIP() (string, error) {
+// 	// example: "inst": "client.4305 172.21.9.34:0/422650892",
+// 	// then returning value will be 172.21.9.34
+// 	clientInfo := ac.Inst
+// 	parts := strings.Fields(clientInfo)
+// 	if len(parts) >= 2 {
+// 		lastColonIndex := strings.LastIndex(parts[1], ":")
+// 		firstPart := parts[1][:lastColonIndex]
+// 		ip := net.ParseIP(firstPart)
+// 		if ip != nil {
+// 			return ip.String(), nil
+// 		}
+// 	}
+
+// 	return "", fmt.Errorf("failed to extract IP address, incorrect format: %s", clientInfo)
+// }
+
 func (ac *activeClient) fetchIP() (string, error) {
-	// example: "inst": "client.4305 172.21.9.34:0/422650892",
-	// then returning value will be 172.21.9.34
 	clientInfo := ac.Inst
-	parts := strings.Fields(clientInfo)
-	if len(parts) >= 2 {
-		lastColonIndex := strings.LastIndex(parts[1], ":")
-		firstPart := parts[1][:lastColonIndex]
-		ip := net.ParseIP(firstPart)
+
+	// Attempt to extract the IP address using a regular expression
+	re := regexp.MustCompile(`(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}|(?:\d+\.){3}\d+`)
+	ipMatches := re.FindStringSubmatch(clientInfo)
+
+	if len(ipMatches) > 0 {
+		ip := net.ParseIP(ipMatches[0])
 		if ip != nil {
 			return ip.String(), nil
 		}