增加ipv6的支持

Tun/NetworkInterface.swift

@@ -14,6 +14,7 @@
 //
 
 import Foundation
+import Network
 
 public struct NetworkInterface {
     public let name: String
@@ -71,5 +72,69 @@ public struct NetworkInterfaceManager {
         
         return interfaces
     }
+
+    // 获取本地网卡中的公网IPv6地址
+    public static func getPublicIPv6Address() -> String? {
+        return self.getPublicIPv6Interface()?.ip
+    }
     
+    // 获取本地网卡中的公网IPv6网卡
+    public static func getPublicIPv6Interface() -> NetworkInterface? {
+        let interfaces = self.getInterfaces()
+
+        return interfaces.first { interface in
+            !interface.name.hasPrefix("utun")
+            && self.isPublicIPv6(interface.ip)
+        }
+    }
+
+    /// 判断一个 IPv6 字符串是否是公网 IPv6
+    public static func isPublicIPv6(_ ipString: String) -> Bool {
+        let normalizedIp = String(ipString.split(separator: "%", maxSplits: 1, omittingEmptySubsequences: false).first ?? "")
+        guard let ipv6 = IPv6Address(normalizedIp) else {
+            return false
+        }
+        return self.isPublicIPv6(ipv6.rawValue)
+    }
+
+    /// 判断 16 字节 IPv6 地址是否是公网 IPv6
+    public static func isPublicIPv6(_ raw: Data) -> Bool {
+        guard raw.count == 16 else {
+            return false
+        }
+
+        let bytes = [UInt8](raw)
+
+        // 1. 排除 unspecified ::
+        if bytes.allSatisfy({ $0 == 0 }) {
+            return false
+        }
+
+        // 2. 排除 loopback ::1
+        if bytes.dropLast().allSatisfy({ $0 == 0 }) && bytes[15] == 1 {
+            return false
+        }
+
+        // 3. 排除 multicast ff00::/8
+        if bytes[0] == 0xFF {
+            return false
+        }
+
+        // 4. 排除 link-local fe80::/10
+        // 即首字节 0xFE，第二字节前两位是 10（二进制）
+        if bytes[0] == 0xFE && (bytes[1] & 0xC0) == 0x80 {
+            return false
+        }
+
+        // 5. 排除 ULA fc00::/7
+        // 即首字节前 7 位是 1111110
+        if (bytes[0] & 0xFE) == 0xFC {
+            return false
+        }
+
+        // 6. 判断是否属于 2000::/3
+        // 即首字节前 3 位是 001
+        return (bytes[0] & 0xE0) == 0x20
+    }
+
 }

Tun/Punchnet/Actors/SDLContextActor.swift

@@ -550,20 +550,9 @@ actor SDLContextActor {
     }
     
     private func makeCurrentV6Info() -> SDLV6Info? {
-        guard let port = self.udpHoleV6LocalAddress?.port else {
-            return nil
-        }
-        
-        let interfaces = NetworkInterfaceManager.getInterfaces()
-        let interface = interfaces.first { interface in
-            interface.ip.contains(":")
-            && !interface.name.hasPrefix("utun")
-            && !interface.ip.hasPrefix("fe80:")
-            && interface.ip != "::"
-        }
-        
-        guard let interface,
-              let ipData = SDLUtil.ipv6StrToData(interface.ip) else {
+        guard let port = self.udpHoleV6LocalAddress?.port,
+              let ip = NetworkInterfaceManager.getPublicIPv6Address(),
+              let ipData = SDLUtil.ipv6StrToData(ip) else {
             return nil
         }