126 lines
2.4 KiB
Go
126 lines
2.4 KiB
Go
// Dummy no-op pluggable transport client. Works only as a managed proxy.
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//
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// Usage (in torrc):
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// UseBridges 1
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// Bridge dummy X.X.X.X:YYYY
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// ClientTransportPlugin dummy exec dummy-client
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//
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// Because this transport doesn't do anything to the traffic, you can use the
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// ORPort of any ordinary bridge (or relay that has DirPort set) in the bridge
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// line; it doesn't have to declare support for the dummy transport.
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package main
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import (
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"io"
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"io/ioutil"
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"net"
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"os"
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"os/signal"
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"sync"
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"syscall"
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)
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import "git.torproject.org/pluggable-transports/goptlib.git"
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var ptInfo pt.ClientInfo
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func copyLoop(a, b net.Conn) {
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var wg sync.WaitGroup
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wg.Add(2)
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go func() {
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io.Copy(b, a)
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wg.Done()
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}()
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go func() {
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io.Copy(a, b)
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wg.Done()
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}()
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wg.Wait()
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}
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func handler(conn *pt.SocksConn) error {
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defer conn.Close()
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remote, err := net.Dial("tcp", conn.Req.Target)
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if err != nil {
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conn.Reject()
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return err
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}
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defer remote.Close()
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err = conn.Grant(remote.RemoteAddr().(*net.TCPAddr))
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if err != nil {
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return err
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}
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copyLoop(conn, remote)
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return nil
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}
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func acceptLoop(ln *pt.SocksListener) error {
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defer ln.Close()
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for {
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conn, err := ln.AcceptSocks()
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if err != nil {
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if e, ok := err.(net.Error); ok && e.Temporary() {
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continue
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}
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return err
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}
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go handler(conn)
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}
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}
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func main() {
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var err error
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ptInfo, err = pt.ClientSetup(nil)
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if err != nil {
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os.Exit(1)
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}
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if ptInfo.ProxyURL != nil {
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pt.ProxyError("proxy is not supported")
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os.Exit(1)
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}
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listeners := make([]net.Listener, 0)
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for _, methodName := range ptInfo.MethodNames {
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switch methodName {
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case "dummy":
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ln, err := pt.ListenSocks("tcp", "127.0.0.1:0")
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if err != nil {
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pt.CmethodError(methodName, err.Error())
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break
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}
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go acceptLoop(ln)
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pt.Cmethod(methodName, ln.Version(), ln.Addr())
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listeners = append(listeners, ln)
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default:
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pt.CmethodError(methodName, "no such method")
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}
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}
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pt.CmethodsDone()
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sigChan := make(chan os.Signal, 1)
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signal.Notify(sigChan, syscall.SIGTERM)
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if os.Getenv("TOR_PT_EXIT_ON_STDIN_CLOSE") == "1" {
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// This environment variable means we should treat EOF on stdin
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// just like SIGTERM: https://bugs.torproject.org/15435.
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go func() {
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io.Copy(ioutil.Discard, os.Stdin)
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sigChan <- syscall.SIGTERM
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}()
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}
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// wait for a signal
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<-sigChan
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// signal received, shut down
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for _, ln := range listeners {
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ln.Close()
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}
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}
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