go.mod; tuntap test cmd

cmd/tap1/main.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"log"
+	"netstack/tcpip/link/rawfile"
+	"netstack/tcpip/link/tuntap"
+)
+
+func main() {
+	tapName := "tap0"
+	c := &tuntap.Config{Name: tapName, Mode: tuntap.TAP}
+	fd, err := tuntap.NewNetDev(c)
+	if err != nil {
+		panic(err)
+	}
+
+	// 启动tap网卡
+	_ = tuntap.SetLinkUp(tapName)
+	//_ = tuntap.AddIP(tapName, "192.168.1.1/24")
+	_ = tuntap.SetRoute(tapName, "192.168.1.0/24") // 其实在链路层通信，是可以不需要 ip 地址的
+	log.Println("启动tap网卡", tapName, "192.169.1.1/24")
+
+	buf := make([]byte, 1<<16)
+	for {
+		rn, err := rawfile.BlockingRead(fd, buf)
+		if err != nil {
+			log.Println(err)
+			continue
+		}
+		log.Printf("read %d bytes", rn)
+	}
+}