func clientHandler(termMon *termmon.TermMonitor, f base.ClientFactory, conn net.Conn, proxyURI *url.URL) {
defer conn.Close()
termMon.OnHandlerStart()
defer termMon.OnHandlerFinish()
name := f.Transport().Name()
// Read the client's SOCKS handshake.
socksReq, err := socks5.Handshake(conn)
if err != nil {
log.Errorf("%s - client failed socks handshake: %s", name, err)
return
}
addrStr := log.ElideAddr(socksReq.Target)
// Deal with arguments.
args, err := f.ParseArgs(&socksReq.Args)
if err != nil {
log.Errorf("%s(%s) - invalid arguments: %s", name, addrStr, err)
socksReq.Reply(socks5.ReplyGeneralFailure)
return
}
// Obtain the proxy dialer if any, and create the outgoing TCP connection.
dialFn := proxy.Direct.Dial
if proxyURI != nil {
dialer, err := proxy.FromURL(proxyURI, proxy.Direct)
if err != nil {
// This should basically never happen, since config protocol
// verifies this.
log.Errorf("%s(%s) - failed to obtain proxy dialer: %s", name, addrStr, log.ElideError(err))
socksReq.Reply(socks5.ReplyGeneralFailure)
return
}
dialFn = dialer.Dial
}
fmt.Println("Got dialer", dialFn, proxyURI, proxy.Direct)
remote, err := f.Dial("tcp", socksReq.Target, dialFn, args)
if err != nil {
log.Errorf("%s(%s) - outgoing connection failed: %s", name, addrStr, log.ElideError(err))
socksReq.Reply(socks5.ErrorToReplyCode(err))
return
}
defer remote.Close()
err = socksReq.Reply(socks5.ReplySucceeded)
if err != nil {
log.Errorf("%s(%s) - SOCKS reply failed: %s", name, addrStr, log.ElideError(err))
return
}
if err = copyLoop(conn, remote); err != nil {
log.Warnf("%s(%s) - closed connection: %s", name, addrStr, log.ElideError(err))
} else {
log.Infof("%s(%s) - closed connection", name, addrStr)
}
return
}
func ClientSetup(termMon *termmon.TermMonitor, target string) (launched bool, listeners []net.Listener) {
methodNames := [...]string{"obfs2"}
var ptClientProxy *url.URL = nil
// Launch each of the client listeners.
for _, name := range methodNames {
t := transports.Get(name)
if t == nil {
log.Errorf("no such transport is supported: %s", name)
continue
}
f, err := t.ClientFactory(stateDir)
if err != nil {
log.Errorf("failed to get ClientFactory: %s", name)
continue
}
fmt.Println("Listening ", socksAddr)
ln, err := net.Listen("tcp", socksAddr)
if err != nil {
log.Errorf("failed to listen %s %s", name, err.Error())
continue
}
go clientAcceptLoop(target, termMon, f, ln, ptClientProxy)
log.Infof("%s - registered listener: %s", name, ln.Addr())
listeners = append(listeners, ln)
launched = true
}
return
}
func clientHandler(target string, termMon *termmon.TermMonitor, f base.ClientFactory, conn net.Conn, proxyURI *url.URL) {
defer conn.Close()
termMon.OnHandlerStart()
defer termMon.OnHandlerFinish()
fmt.Println("handling...")
name := f.Transport().Name()
fmt.Println("Transport is", name)
// Deal with arguments.
args, err := f.ParseArgs(&pt.Args{})
if err != nil {
fmt.Println("Invalid arguments")
log.Errorf("%s(%s) - invalid arguments: %s", name, target, err)
return
}
fmt.Println("Making dialer...")
// Obtain the proxy dialer if any, and create the outgoing TCP connection.
dialFn := proxy.Direct.Dial
if proxyURI != nil {
dialer, err := proxy.FromURL(proxyURI, proxy.Direct)
if err != nil {
// This should basically never happen, since config protocol
// verifies this.
fmt.Println("failed to obtain dialer", proxyURI, proxy.Direct)
log.Errorf("%s(%s) - failed to obtain proxy dialer: %s", name, target, log.ElideError(err))
return
}
dialFn = dialer.Dial
}
fmt.Println("Dialing...")
remote, err := f.Dial("tcp", target, dialFn, args)
if err != nil {
fmt.Println("outgoing connection failed")
log.Errorf("%s(%s) - outgoing connection failed: %s", name, target, log.ElideError(err))
return
}
defer remote.Close()
fmt.Println("copying...")
if err = copyLoop(conn, remote); err != nil {
log.Warnf("%s(%s) - closed connection: %s", name, target, log.ElideError(err))
} else {
log.Infof("%s(%s) - closed connection", name, target)
}
fmt.Println("done")
return
}
func serverHandler(termMon *termmon.TermMonitor, f base.ServerFactory, conn net.Conn, info *pt.ServerInfo) {
defer conn.Close()
termMon.OnHandlerStart()
defer termMon.OnHandlerFinish()
name := f.Transport().Name()
addrStr := log.ElideAddr(conn.RemoteAddr().String())
log.Infof("%s(%s) - new connection", name, addrStr)
// Instantiate the server transport method and handshake.
remote, err := f.WrapConn(conn)
if err != nil {
log.Warnf("%s(%s) - handshake failed: %s", name, addrStr, log.ElideError(err))
return
}
// Connect to the orport.
orConn, err := pt.DialOr(info, conn.RemoteAddr().String(), name)
if err != nil {
log.Errorf("%s(%s) - failed to connect to ORPort: %s", name, addrStr, log.ElideError(err))
return
}
defer orConn.Close()
if err = copyLoop(orConn, remote); err != nil {
log.Warnf("%s(%s) - closed connection: %s", name, addrStr, log.ElideError(err))
} else {
log.Infof("%s(%s) - closed connection", name, addrStr)
}
return
}
func dialConn(tracker *ConnTracker, addr string, target string, f base.ClientFactory, proxyURI *url.URL) {
// Obtain the proxy dialer if any, and create the outgoing TCP connection.
dialFn := proxy.Direct.Dial
if proxyURI != nil {
dialer, err := proxy.FromURL(proxyURI, proxy.Direct)
if err != nil {
// This should basically never happen, since config protocol
// verifies this.
fmt.Println("failed to obtain dialer", proxyURI, proxy.Direct)
log.Errorf("(%s) - failed to obtain proxy dialer: %s", target, log.ElideError(err))
return
}
dialFn = dialer.Dial
}
fmt.Println("Dialing....")
// Deal with arguments.
args, err := f.ParseArgs(&pt.Args{})
if err != nil {
fmt.Println("Invalid arguments")
log.Errorf("(%s) - invalid arguments: %s", target, err)
delete(*tracker, addr)
return
}
fmt.Println("Dialing ", target)
remote, err := f.Dial("tcp", target, dialFn, args)
if err != nil {
fmt.Println("outgoing connection failed", err)
log.Errorf("(%s) - outgoing connection failed: %s", target, log.ElideError(err))
fmt.Println("Failed")
delete(*tracker, addr)
return
}
fmt.Println("Success")
(*tracker)[addr] = ConnState{&remote, false}
}
func ClientSetup(termMon *termmon.TermMonitor, target string) bool {
methodNames := [...]string{"obfs2"}
var ptClientProxy *url.URL = nil
// Launch each of the client listeners.
for _, name := range methodNames {
t := transports.Get(name)
if t == nil {
log.Errorf("no such transport is supported: %s", name)
continue
}
f, err := t.ClientFactory(stateDir)
if err != nil {
log.Errorf("failed to get ClientFactory: %s", name)
continue
}
udpAddr, err := net.ResolveUDPAddr("udp", socksAddr)
if err != nil {
fmt.Println("Error resolving address", socksAddr)
}
fmt.Println("@@@ Listening ", name, socksAddr)
ln, err := net.ListenUDP("udp", udpAddr)
if err != nil {
log.Errorf("failed to listen %s %s", name, err.Error())
continue
}
go clientHandler(target, termMon, f, ln, ptClientProxy)
log.Infof("%s - registered listener: %s", name, ln)
}
return true
}
func main() {
// Initialize the termination state monitor as soon as possible.
termMon = termmon.NewTermMonitor()
// Handle the command line arguments.
_, execName := path.Split(os.Args[0])
showVer := flag.Bool("version", false, "Print version and exit")
logLevelStr := flag.String("logLevel", "ERROR", "Log level (ERROR/WARN/INFO/DEBUG)")
enableLogging := flag.Bool("enableLogging", false, "Log to TOR_PT_STATE_LOCATION/"+obfs4proxyLogFile)
unsafeLogging := flag.Bool("unsafeLogging", false, "Disable the address scrubber")
transparent := flag.Bool("transparent", false, "Enable transparent proxy mode")
udp := flag.Bool("udp", false, "Enable UDP proxy mode")
target := flag.String("target", "", "Specify transport server destination address")
clientMode := flag.Bool("client", false, "Enable client mode")
serverMode := flag.Bool("server", false, "Enable server mode")
statePath := flag.String("state", "", "Specify transport server destination address")
bindAddr := flag.String("bindaddr", "", "Specify the bind address for transparent server")
flag.Parse()
if *showVer {
fmt.Printf("%s\n", getVersion())
os.Exit(0)
}
if err := log.SetLogLevel(*logLevelStr); err != nil {
fmt.Println("failed to set log level")
golog.Fatalf("[ERROR]: %s - failed to set log level: %s", execName, err)
}
// Determine if this is a client or server, initialize the common state.
var ptListeners []net.Listener
launched := false
isClient, err := checkIsClient(*clientMode, *serverMode)
if err != nil {
golog.Fatalf("[ERROR]: %s - must be run as a managed transport", execName)
}
if stateDir, err = makeStateDir(*statePath); err != nil {
golog.Fatalf("[ERROR]: %s - No state directory: %s", execName, err)
}
if err = log.Init(*enableLogging, path.Join(stateDir, obfs4proxyLogFile), *unsafeLogging); err != nil {
golog.Fatalf("[ERROR]: %s - failed to initialize logging", execName)
}
if err = transports.Init(); err != nil {
log.Errorf("%s - failed to initialize transports: %s", execName, err)
os.Exit(-1)
}
log.Noticef("%s - launched", getVersion())
fmt.Println("launching")
if *transparent {
// Do the transparent proxy configuration.
log.Infof("%s - initializing transparent proxy", execName)
if *udp {
log.Infof("%s - initializing UDP transparent proxy", execName)
if isClient {
log.Infof("%s - initializing client transport listeners", execName)
if *target == "" {
log.Errorf("%s - transparent mode requires a target", execName)
} else {
fmt.Println("transparent udp client")
launched = transparent_udp.ClientSetup(termMon, *target)
}
} else {
log.Infof("%s - initializing server transport listeners", execName)
if *bindAddr == "" {
fmt.Println("%s - transparent mode requires a bindaddr", execName)
} else {
fmt.Println("transparent udp server")
launched = transparent_udp.ServerSetup(termMon, *bindAddr, *target)
fmt.Println("launched", launched, ptListeners)
}
}
} else {
log.Infof("%s - initializing TCP transparent proxy", execName)
if isClient {
log.Infof("%s - initializing client transport listeners", execName)
if *target == "" {
log.Errorf("%s - transparent mode requires a target", execName)
} else {
launched, ptListeners = transparent_tcp.ClientSetup(termMon, *target)
}
} else {
log.Infof("%s - initializing server transport listeners", execName)
if *bindAddr == "" {
fmt.Println("%s - transparent mode requires a bindaddr", execName)
} else {
launched, ptListeners = transparent_tcp.ServerSetup(termMon, *bindAddr)
fmt.Println("launched", launched, ptListeners)
}
}
}
} else {
if *udp {
log.Infof("%s - initializing STUN UDP proxy", execName)
if isClient {
log.Infof("%s - initializing client transport listeners", execName)
if *target == "" {
log.Errorf("%s - STUN mode requires a target", execName)
} else {
fmt.Println("STUN udp client")
launched = stun_udp.ClientSetup(termMon, *target)
}
} else {
log.Infof("%s - initializing server transport listeners", execName)
if *bindAddr == "" {
fmt.Println("%s - STUN mode requires a bindaddr", execName)
} else {
fmt.Println("STUN udp server")
launched = stun_udp.ServerSetup(termMon, *bindAddr, *target)
fmt.Println("launched", launched, ptListeners)
}
}
} else {
// Do the managed pluggable transport protocol configuration.
log.Infof("%s - initializing PT 1.0 proxy", execName)
if isClient {
log.Infof("%s - initializing client transport listeners", execName)
launched, ptListeners = pt_socks5.ClientSetup(termMon)
} else {
log.Infof("%s - initializing server transport listeners", execName)
launched, ptListeners = pt_socks5.ServerSetup(termMon)
}
}
}
if !launched {
// Initialization failed, the client or server setup routines should
// have logged, so just exit here.
os.Exit(-1)
}
fmt.Println("launched")
log.Infof("%s - accepting connections", execName)
defer func() {
log.Noticef("%s - terminated", execName)
}()
// At this point, the pt config protocol is finished, and incoming
// connections will be processed. Wait till the parent dies
// (immediate exit), a SIGTERM is received (immediate exit),
// or a SIGINT is received.
if sig := termMon.Wait(false); sig == syscall.SIGTERM {
return
}
// Ok, it was the first SIGINT, close all listeners, and wait till,
// the parent dies, all the current connections are closed, or either
// a SIGINT/SIGTERM is received, and exit.
for _, ln := range ptListeners {
ln.Close()
}
termMon.Wait(true)
fmt.Println("waiting")
for {
// FIXME - block because termMon.Wait is not blocking
}
}