增加arp请求的过期时间处理

Tun/Punchnet/Actors/ArpServerActor.swift

@@ -8,18 +8,36 @@ import Foundation
 import Darwin
 
 actor ArpServerActor {
-    private var known_macs: [UInt32:Data] = [:]
+    // 增加缓存时间逻辑
+    struct ArpEntry {
+        var mac: Data
+        var expireTime: TimeInterval
+    }
     
-    init() {
-        
+    private var packetId: UInt32 = 1
+    private var known_macs: [UInt32: ArpEntry] = [:]
+    private let arpTTL: TimeInterval
+    
+    init(arpTTL: TimeInterval = 300) {
+        self.arpTTL = arpTTL
     }
     
     func query(ip: UInt32) -> Data? {
-        return self.known_macs[ip]
+        guard let entry = known_macs[ip] else {
+            return nil
+        }
+        
+        if entry.expireTime < Date().timeIntervalSince1970 {
+            known_macs.removeValue(forKey: ip)
+            return nil
+        }
+        
+        return entry.mac
     }
     
     func append(ip: UInt32, mac: Data) {
-        self.known_macs[ip] = mac
+        let expireAt = Date().timeIntervalSince1970 + arpTTL
+        self.known_macs[ip] = ArpEntry(mac: mac, expireTime: expireAt)
     }
     
     func remove(ip: UInt32) {
@@ -27,11 +45,33 @@ actor ArpServerActor {
     }
     
     func dropMacs(macs: [Data]) {
-        self.known_macs = self.known_macs.filter { !macs.contains($0.value) }
+        self.known_macs = self.known_macs.filter { !macs.contains($0.value.mac) }
     }
     
     func clear() {
         self.known_macs = [:]
     }
     
+    func arpRequest(targetIp: UInt32, use quicClient: SDLQUICClient?) throws {
+        guard let quicClient else {
+            return
+        }
+        
+        // 进行arp查询
+        var arpRequest = SDLArpRequest()
+        arpRequest.targetIp = targetIp
+        arpRequest.pktID = self.packetId
+        self.packetId += 1
+        
+        quicClient.send(type: .arpRequest, data: try arpRequest.serializedData())
+    }
+    
+    func handleArpResponse(arpResponse: SDLArpResponse) {
+        let targetIp = arpResponse.targetIp
+        let targetMac = arpResponse.targetMac
+        if !targetMac.isEmpty {
+            self.append(ip: targetIp, mac: targetMac)
+        }
+    }
+    
 }

Tun/Punchnet/Actors/SDLContextActor.swift

@@ -97,7 +97,7 @@ actor SDLContextActor {
         let snapshotPublisher = SnapshotPublisher(initial: IdentitySnapshot.empty())
         self.identifyStore = IdentityStore(publisher: snapshotPublisher)
         self.snapshotPublisher = snapshotPublisher
-        self.policyRequesterActor = PolicyRequesterActor(querySocketAddress: config.stunSocketAddress)
+        self.policyRequesterActor = PolicyRequesterActor()
     }
     
     public func start() {
@@ -167,6 +167,8 @@ actor SDLContextActor {
                 case .policyReponse(let policyResponse):
                     // 处理权限的请求问题
                     await self.identifyStore.apply(policyResponse: policyResponse)
+                case .arpResponse(let arpResponse):
+                    await self.arpServer.handleArpResponse(arpResponse: arpResponse)
                 }
             }
         }
@@ -644,9 +646,11 @@ actor SDLContextActor {
         }
         else {
             SDLLogger.shared.log("[SDLContext] dstIp: \(dstIp.asIpAddress()) arp query not found, broadcast", level: .debug)
-            // 构造arp广播
-            let arpReqeust = ARPPacket.arpRequest(senderIP: networkAddr.ip, senderMAC: networkAddr.mac, targetIP: dstIp)
-            await self.routeLayerPacket(dstMac: ARPPacket.broadcastMac , type: .arp, data: arpReqeust.marshal())
+//            // 构造arp广播
+//            let arpReqeust = ARPPacket.arpRequest(senderIP: networkAddr.ip, senderMAC: networkAddr.mac, targetIP: dstIp)
+//            await self.routeLayerPacket(dstMac: ARPPacket.broadcastMac , type: .arp, data: arpReqeust.marshal())
+            
+            try? await self.arpServer.arpRequest(targetIp: dstIp, use: self.quicClient)
         }
     }
     

Tun/Punchnet/Actors/SDLQuicClient.swift

@@ -213,6 +213,12 @@ final class SDLQUICClient {
                 return nil
             }
             return .policyReponse(policyResponse)
+        case .arpResponse:
+            guard let bytes = buffer.readBytes(length: buffer.readableBytes),
+                  let arpResponse = try? SDLArpResponse(serializedBytes: bytes) else {
+                return nil
+            }
+            return .arpResponse(arpResponse)
         case .event:
             guard let eventVal = buffer.readInteger(as: UInt8.self),
                   let event = SDLEventType(rawValue: eventVal),

Tun/Punchnet/Policy/PolicyRequesterActor.swift

@@ -16,11 +16,9 @@ actor PolicyRequesterActor {
     
     // 处理各个请求的版本问题, map[identityId] = version
     private var versions: [UInt32: UInt32] = [:]
-    // 处理holer
-    nonisolated private let querySocketAddress: SocketAddress
     
-    init(querySocketAddress: SocketAddress) {
-        self.querySocketAddress = querySocketAddress
+    init() {
+        
     }
     
     // 提交权限请求

Tun/Punchnet/SDLMessage.swift

@@ -124,6 +124,8 @@ enum SDLQUICInboundMessage {
     case peerInfo(SDLPeerInfo)
     case event(SDLEvent)
     case policyReponse(SDLPolicyResponse)
+    
+    case arpResponse(SDLArpResponse)
 }
 
 // 命令类型