106 lines
2.4 KiB
Go
106 lines
2.4 KiB
Go
package main
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import (
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"bytes"
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"crypto/md5"
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"encoding/hex"
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"github.com/TransX/log"
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"github.com/TransX/tscipher"
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"net"
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"strconv"
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"sync/atomic"
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"time"
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)
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var seed int32
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func init() {
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seed = 0
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}
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type Tunnel struct {
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id string
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src net.Conn
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dest net.Conn
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cipherDirection string
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}
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func NewTunnel(src, dest net.Conn, cipherDirection string) *Tunnel {
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return &Tunnel{
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id: tunnelID(),
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src: src,
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dest: dest,
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cipherDirection: cipherDirection,
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}
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}
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func (this *Tunnel) GetID(id string) string {
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return this.id
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}
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func (this *Tunnel) SetID(id string) { //rarely used
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this.id = id
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}
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//tunnel model : [ -->>server ---- client -->> ](this is a tunnel)
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func (this *Tunnel) run() { //单向的，从src发送到dest
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src := this.src
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dest := this.dest
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cipherDirection := this.cipherDirection
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id := this.id
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defer func() {
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if r := recover(); r != nil {
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if src != nil {
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src.Close()
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}
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if dest != nil {
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dest.Close()
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}
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}
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}()
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cache := make([]byte, 1024*2) //128kB
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for {
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//构建Carrier
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revCarrier := &tscipher.Carrier{
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src,
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tscipher.NewCipher("XOR"),
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cache,
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this.id,
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}
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// log.Debug("Encrypt Direction %s ID %s", cipherDirection, id)
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if cipherDirection != "receive" {
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revCarrier.Cipher = nil
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// log.Debug("Read not crypted. Tunnel: %s", id)
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}
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nByte, err := tscipher.ReceiveData(revCarrier)
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if err != nil {
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log.Panic("Read panic. Tunnel id: %s. Remote Add: %s. Err:%s", id, src.RemoteAddr().String(), err)
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}
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log.Info("Reived %d bytes from %s. Tunnel: id %s", nByte, src.RemoteAddr().String(), id)
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sendCarrier := &tscipher.Carrier{
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dest,
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tscipher.NewCipher("XOR"),
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cache, //TODO:危险，cache的容量容易被不小心修改
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this.id,
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}
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if cipherDirection != "send" {
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sendCarrier.Cipher = nil
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// log.Debug("Write not crypted. Tunnel: %s", id)
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}
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n, err := tscipher.SendData(sendCarrier, nByte)
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log.Info("Write %d bytes from %s to %s. Tunnel: %s", n, dest.LocalAddr(), dest.RemoteAddr().String(), id)
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if err != nil {
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log.Panic("Write panic. ID: %s, Err: %s, Remote Add: %s", id, err, dest.RemoteAddr().String())
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}
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}
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}
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func tunnelID() string {
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nowString := time.Now().String() + strconv.Itoa(int(seed))
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atomic.AddInt32(&seed, 1) //避免多线程情况下获得的种子相同
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md5Byte := md5.Sum(bytes.NewBufferString(nowString).Bytes())
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return hex.EncodeToString(md5Byte[:])
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}
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