Cloak/internal/client/piper.go
2020-04-06 13:07:16 +01:00

145 lines
3.0 KiB
Go

package client
import (
"io"
"net"
"sync/atomic"
"time"
mux "github.com/cbeuw/Cloak/internal/multiplex"
"github.com/cbeuw/Cloak/internal/util"
log "github.com/sirupsen/logrus"
)
func RouteUDP(localConfig *localConnConfig, newSeshFunc func() *mux.Session) {
var sesh *mux.Session
localUDPAddr, err := net.ResolveUDPAddr("udp", localConfig.LocalAddr)
if err != nil {
log.Fatal(err)
}
start:
localConn, err := net.ListenUDP("udp", localUDPAddr)
if err != nil {
log.Fatal(err)
}
var otherEnd atomic.Value
data := make([]byte, 10240)
i, oe, err := localConn.ReadFromUDP(data)
if err != nil {
log.Errorf("Failed to read first packet from proxy client: %v", err)
localConn.Close()
return
}
otherEnd.Store(oe)
if sesh == nil || sesh.IsClosed() {
sesh = newSeshFunc()
}
log.Debugf("proxy local address %v", otherEnd.Load().(*net.UDPAddr).String())
stream, err := sesh.OpenStream()
if err != nil {
log.Errorf("Failed to open stream: %v", err)
localConn.Close()
//localConnWrite.Close()
return
}
_, err = stream.Write(data[:i])
if err != nil {
log.Errorf("Failed to write to stream: %v", err)
localConn.Close()
//localConnWrite.Close()
stream.Close()
return
}
// stream to proxy
go func() {
buf := make([]byte, 16380)
for {
i, err := io.ReadAtLeast(stream, buf, 1)
if err != nil {
log.Print(err)
localConn.Close()
stream.Close()
break
}
_, err = localConn.WriteToUDP(buf[:i], otherEnd.Load().(*net.UDPAddr))
if err != nil {
log.Print(err)
localConn.Close()
stream.Close()
break
}
}
}()
// proxy to stream
buf := make([]byte, 16380)
if localConfig.Timeout != 0 {
localConn.SetReadDeadline(time.Now().Add(localConfig.Timeout))
}
for {
if localConfig.Timeout != 0 {
localConn.SetReadDeadline(time.Now().Add(localConfig.Timeout))
}
i, oe, err := localConn.ReadFromUDP(buf)
if err != nil {
localConn.Close()
stream.Close()
break
}
otherEnd.Store(oe)
_, err = stream.Write(buf[:i])
if err != nil {
localConn.Close()
stream.Close()
break
}
}
goto start
}
func RouteTCP(localConfig *localConnConfig, newSeshFunc func() *mux.Session) {
tcpListener, err := net.Listen("tcp", localConfig.LocalAddr)
if err != nil {
log.Fatal(err)
}
var sesh *mux.Session
for {
localConn, err := tcpListener.Accept()
if err != nil {
log.Fatal(err)
continue
}
if sesh == nil || sesh.IsClosed() {
sesh = newSeshFunc()
}
go func() {
data := make([]byte, 10240)
i, err := io.ReadAtLeast(localConn, data, 1)
if err != nil {
log.Errorf("Failed to read first packet from proxy client: %v", err)
localConn.Close()
return
}
stream, err := sesh.OpenStream()
if err != nil {
log.Errorf("Failed to open stream: %v", err)
localConn.Close()
return
}
_, err = stream.Write(data[:i])
if err != nil {
log.Errorf("Failed to write to stream: %v", err)
localConn.Close()
stream.Close()
return
}
go util.Pipe(localConn, stream, 0)
util.Pipe(stream, localConn, localConfig.Timeout)
}()
}
}