118 lines
2.1 KiB
Go
118 lines
2.1 KiB
Go
// Dummy no-op pluggable transport server. Works only as a managed proxy.
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//
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// Usage (in torrc):
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// BridgeRelay 1
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// ORPort 9001
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// ExtORPort 6669
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// ServerTransportPlugin dummy exec dummy-server
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//
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// Because the dummy transport doesn't do anything to the traffic, you can
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// connect to it with any ordinary Tor client; you don't have to use
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// dummy-client.
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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.ServerInfo
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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 net.Conn) error {
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defer conn.Close()
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or, err := pt.DialOr(&ptInfo, conn.RemoteAddr().String(), "dummy")
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if err != nil {
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return err
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}
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defer or.Close()
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copyLoop(conn, or)
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return nil
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}
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func acceptLoop(ln net.Listener) error {
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defer ln.Close()
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for {
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conn, err := ln.Accept()
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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.ServerSetup(nil)
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if err != nil {
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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 _, bindaddr := range ptInfo.Bindaddrs {
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switch bindaddr.MethodName {
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case "dummy":
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ln, err := net.ListenTCP("tcp", bindaddr.Addr)
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if err != nil {
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pt.SmethodError(bindaddr.MethodName, err.Error())
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break
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}
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go acceptLoop(ln)
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pt.Smethod(bindaddr.MethodName, ln.Addr())
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listeners = append(listeners, ln)
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default:
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pt.SmethodError(bindaddr.MethodName, "no such method")
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}
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}
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pt.SmethodsDone()
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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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