feat(vpn服务器): VPN 服务器的简单实现

WebSocket的数据写入网卡，将网卡读取的数据写入WebSocket

eth/eth.go

@@ -0,0 +1,54 @@
+package eth
+
+import (
+	"log"
+
+	"github.com/google/gopacket"
+	"github.com/google/gopacket/pcap"
+	"github.com/gorilla/websocket"
+)
+
+const (
+	interfaceName = "eth0"
+)
+
+type Eth struct {
+	Handle *pcap.Handle
+}
+
+func Init() *Eth {
+	handle, err := pcap.OpenLive(interfaceName, 1600, true, pcap.BlockForever)
+	if err != nil {
+		log.Fatal("打开驱动器失败: ", err)
+		return nil
+	}
+	return &Eth{Handle: handle}
+}
+
+/**
+ * 抓取网卡的数据，并写入WebSocket
+ */
+func (eth *Eth) EthernetPacketsToWs(wsConn *websocket.Conn) error {
+
+	packetSource := gopacket.NewPacketSource(eth.Handle, eth.Handle.LinkType())
+	for packet := range packetSource.Packets() {
+		wsConn.WriteMessage(websocket.BinaryMessage, packet.Data())
+	}
+	return nil
+}
+
+/**
+ * 将ws的数据写入网卡
+ */
+func (eth *Eth) WsToEthernet(wsConn *websocket.Conn) {
+	for {
+		_, p, err := wsConn.ReadMessage()
+		if err != nil {
+			return
+		}
+		err = eth.Handle.WritePacketData(p)
+		if err != nil {
+			log.Fatal(err)
+		}
+	}
+}