fix util

Tun/Punchnet/SDLUtil.swift

@@ -67,6 +67,20 @@ struct SDLUtil {
         }
     }
 
+    public static func ipv6StrToData(_ ip: String) -> Data? {
+        let normalizedIp = String(ip.split(separator: "%", maxSplits: 1, omittingEmptySubsequences: false).first ?? "")
+        guard !normalizedIp.isEmpty else {
+            return nil
+        }
+        
+        var address = in6_addr()
+        guard inet_pton(AF_INET6, normalizedIp, &address) == 1 else {
+            return nil
+        }
+        
+        return withUnsafeBytes(of: &address) { Data($0) }
+    }
+    
     // 判断ip地址是否在同一个网络
     public static func inSameNetwork(ip: UInt32, compareIp: UInt32, maskLen: UInt8) -> Bool {
         if ip == compareIp {