新TAP测试(TODO 解析arp)

netcard.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"encoding/binary"
 	"fmt"
 	"log"
 	"net"
@@ -87,18 +88,25 @@ func NewNetTunnel() *NetTunnel {
 			switch frame.Ethertype() {
 			case ethernet.ARP:
 				log.Printf("bytes len: %d type(arp): % x", len(rbuf), frame.Ethertype()) // 数据长度
-				//TODO: 解析arp 回应arp
-				nt.clients.Range(func(key, value any) bool {
-					if key == nt.ipv4key {
-						return true
-					}
 
-					client := value.(*RPCClient)
-					client.CheckConnect()
-					client.Frame <- frame
-					log.Println(client.realAddr)
-					return true
-				})
+				SwapBytes(frame, 0, frame, 6, 6)
+				binary.BigEndian.PutUint16(frame[20:22], 2)
+				SwapBytes(frame, 22, frame, 32, 10)
+
+				nt.ifce.Write(frame)
+
+				//TODO: 解析arp 回应arp
+				// nt.clients.Range(func(key, value any) bool {
+				// 	if key == nt.ipv4key {
+				// 		return true
+				// 	}
+
+				// 	client := value.(*RPCClient)
+				// 	client.CheckConnect()
+				// 	client.Frame <- frame
+				// 	log.Println(client.realAddr)
+				// 	return true
+				// })
 			case ethernet.IPv4:
 				log.Printf("bytes len: %d type(ipv4): % x", len(rbuf), frame.Ethertype())
 				log.Println(len(frame))

utils.go

@@ -54,3 +54,10 @@ func Decompress(data []byte) (frames [][]byte) {
 
 	return
 }
+
+func SwapBytes(frame1 []byte, start1 int, frame2 []byte, start2 int, size int) {
+	var temp []byte = make([]byte, size)
+	copy(temp, frame1[start1:start1+size])
+	copy(frame1[start1:start1+size], frame2[start2:start2+size])
+	copy(frame2[start2:start2+size], temp)
+}