158 lines
3.0 KiB
Go
158 lines
3.0 KiB
Go
package main
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import (
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"context"
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"log"
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"os/exec"
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gen "slimming/proto/gen"
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"strings"
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"time"
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"github.com/songgao/packets/ethernet"
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"github.com/songgao/water"
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"google.golang.org/grpc"
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"google.golang.org/grpc/credentials/insecure"
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)
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type NetCard struct {
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FrameChan chan [][]byte
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ifce *water.Interface
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cli *RPCClient
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server *RPCServer
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}
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type RPCClient struct {
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FrameChan chan [][]byte
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conn *grpc.ClientConn
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}
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func (cli *RPCClient) connect() {
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log.Println("rpcclient start")
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defer log.Println("rpcclient exit")
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conn, err := grpc.Dial(*othersAddr,
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grpc.WithTransportCredentials(insecure.NewCredentials()),
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)
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if err != nil {
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log.Printf("did not connect: %v", err)
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return
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}
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cli.conn = conn
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go cli.run()
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}
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func (cli *RPCClient) run() {
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c := gen.NewFrameServiceClient(cli.conn)
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ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
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defer cancel()
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stream, err := c.SendFrames(ctx)
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if err != nil {
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panic(err)
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}
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for {
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// Contact the server and print out its response.
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// 发到对面的网卡
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err = stream.Send(&gen.Request{
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Frames: <-cli.FrameChan,
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})
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if err != nil {
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panic(err)
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}
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}
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}
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func (nc *NetCard) Run() {
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go nc.runRead()
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go nc.runWrite()
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// go nc.cli.run()
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time.Sleep(time.Second)
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cmd := strings.Split("addr add 10.10.10.10/24 dev stap", " ")
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err := exec.Command(cmd[0], cmd[1:]...).Run()
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if err != nil {
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panic(err)
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}
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cmd = strings.Split("ip link set dev stap up", " ")
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err = exec.Command(cmd[0], cmd[1:]...).Run()
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if err != nil {
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panic(err)
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}
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nc.server.run()
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}
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func NewNetCard() *NetCard {
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config := water.Config{
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DeviceType: water.TAP,
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}
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config.Name = "stap"
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ifce, err := water.New(config)
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if err != nil {
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log.Fatal(err)
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}
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nc := &NetCard{
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FrameChan: make(chan [][]byte, 2000),
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ifce: ifce,
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cli: &RPCClient{FrameChan: make(chan [][]byte, 2000)},
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}
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nc.server = newRPCServer(nc)
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return nc
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}
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func (nc *NetCard) runRead() {
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var ifce *water.Interface = nc.ifce
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var ticker time.Ticker = *time.NewTicker(time.Millisecond * 20)
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for {
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var framesBytes [][]byte
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for range ticker.C {
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var rframe ethernet.Frame
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rframe.Resize(1500)
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n, err := ifce.Read([]byte(rframe))
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if err != nil {
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log.Fatal(err)
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}
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rframe = rframe[:n]
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framesBytes = append(framesBytes, []byte(rframe))
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}
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println(len(framesBytes))
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if len(framesBytes) > 0 {
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if nc.cli.conn == nil {
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nc.cli.connect()
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}
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if nc.cli.conn != nil {
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nc.cli.FrameChan <- framesBytes // 网卡数据 发到对方
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}
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}
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// 写到grpc服务
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// log.Printf("Dst: %s\n", rframe.Destination()[0:4])
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// log.Printf("Src: %s\n", rframe.Source()[0:4])
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// log.Printf("Ethertype: % x\n", rframe.Ethertype())
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// log.Printf("Payload: % x\n", rframe.Payload())
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}
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}
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func (nc *NetCard) runWrite() {
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var ifce *water.Interface = nc.ifce
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for wframes := range nc.FrameChan {
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for _, wframe := range wframes {
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_, err := ifce.Write(wframe)
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if err != nil {
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panic(err)
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}
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}
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}
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}
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