113 lines
3.0 KiB
Go
113 lines
3.0 KiB
Go
package protocol
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import (
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"errors"
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"fmt"
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"github.com/TransX/constant"
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"github.com/TransX/log"
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"github.com/TransX/model"
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"github.com/TransX/stat"
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"github.com/TransX/utils"
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"net"
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"os"
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)
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var tunMng *stat.TunnelStatusManager
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func init() {
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tunMng = stat.NewTunnelStatusManager()
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}
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type TransTCP struct {
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}
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func NewTransTCP() *TransTCP {
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return &TransTCP{}
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}
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func (this *TransTCP) createTCPClient(ip, port string) (conn net.Conn, err error) {
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conn, err = net.Dial("tcp4", ip+":"+port)
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if err != nil {
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conn = nil
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}
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return
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}
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func (this *TransTCP) createTCPClientWithRetry(ip, port string, retry int) (conn net.Conn, err error) {
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for i := 0; i < retry; i++ {
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c, e := this.createTCPClient(ip, port)
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if e == nil {
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return c, e
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}
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log.Error("Create Client Error: %s", e.Error())
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}
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//failed with retry
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return nil, errors.New(fmt.Sprintln("failed to create client after %d retry", retry))
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}
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func (this *TransTCP) createTCPListener(ip, port string) (listen net.Listener, err error) {
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listener, _err := net.Listen("tcp4", ip+":"+port)
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if _err == nil {
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listen = listener
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err = nil
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return
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} else {
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listen = nil
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err = _err
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}
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return
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}
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func (this *TransTCP) Start(listenPort, destIP, destPort string, clientOrServer string) {
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listener, err := this.createTCPListener("0.0.0.0", listenPort)
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if err != nil {
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log.Panic("Failed to create listener. %s", err)
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os.Exit(0)
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}
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for {
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if listenerConn, err := listener.Accept(); err == nil {
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go func() {
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log.Info("Incoming %s", listenerConn.RemoteAddr().String())
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//创建到目标的连接
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destConn, err := this.createTCPClientWithRetry(destIP, destPort, 3)
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if err != nil {
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log.Panic("Failed to connect to destination. %s", err)
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os.Exit(0)
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}
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log.Info("Dial %s", destConn.RemoteAddr().String())
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//tunnel model : [ -->>server ---- client -->> ](this is a tunnel)
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if clientOrServer == "client" { //加密方向
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sendID := utils.TunnelID()
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ntSend := model.NewTunnel(sendID, listenerConn, destConn, constant.SEND)
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receiveID := utils.TunnelID()
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ntRev := model.NewTunnel(receiveID, destConn, listenerConn, constant.RECEIVE)
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printModelDetail(sendID, receiveID)
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tunnelPair := model.NewTunnelPair(ntSend, ntRev)
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tunnelPair.SetRegChan(tunMng.GetRegChan())
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tunnelPair.SetUnRegChan(tunMng.GetUnregChan())
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tunnelPair.Run()
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}
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if clientOrServer == "server" {
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receiveID := utils.TunnelID()
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ntRev := model.NewTunnel(receiveID, listenerConn, destConn, constant.RECEIVE)
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sendID := utils.TunnelID()
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ntSend := model.NewTunnel(sendID, destConn, listenerConn, constant.SEND)
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printModelDetail(sendID, receiveID)
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tunnelPair := model.NewTunnelPair(ntSend, ntRev)
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tunnelPair.SetRegChan(tunMng.GetRegChan())
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tunnelPair.SetUnRegChan(tunMng.GetUnregChan())
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tunnelPair.Run()
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}
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}()
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} else {
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log.Error("Failed to accept incoming connection. %s", err)
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}
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}
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}
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func printModelDetail(tunnelIDA, tunnelIDB string) {
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log.Info("id %s and id %s belong to a model", tunnelIDA, tunnelIDB)
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}
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