func clientHandler(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
}
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 clientHandler(f base.ClientFactory, conn net.Conn, proxyURI *url.URL, linkInfo LinkInfo) {
defer conn.Close()
termMon.onHandlerStart()
defer termMon.onHandlerFinish()
name := f.Transport().Name()
fakeReq, err := parseClientParameters(strings.Replace(linkInfo.PtArgs, ",", ";", -1))
if err != nil {
log.Errorf("%s - client failed socks handshake: %s", name, err)
return
}
addrStr := log.ElideAddr(linkInfo.ServerAddr)
// Deal with arguments.
args, err := f.ParseArgs(&fakeReq)
if err != nil {
log.Errorf("%s(%s) - invalid arguments: %s", name, addrStr, err)
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))
return
}
dialFn = dialer.Dial
}
remote, er := f.Dial("tcp", linkInfo.ServerAddr, dialFn, args)
if er != nil {
log.Errorf("%s(%s) - outgoing connection failed: %s", name, addrStr, log.ElideError(er))
return
}
defer remote.Close()
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 serverHandler(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 main() {
// Initialize the termination state monitor as soon as possible.
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")
flag.Parse()
if *showVer {
fmt.Printf("%s\n", getVersion())
os.Exit(0)
}
if err := log.SetLogLevel(*logLevelStr); err != nil {
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 := ptIsClient()
if err != nil {
golog.Fatalf("[ERROR]: %s - must be run as a managed transport", execName)
}
if stateDir, err = pt.MakeStateDir(); 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())
// Do the managed pluggable transport protocol configuration.
if isClient {
log.Infof("%s - initializing client transport listeners", execName)
launched, ptListeners = clientSetup()
} else {
log.Infof("%s - initializing server transport listeners", execName)
launched, ptListeners = serverSetup()
}
if !launched {
// Initialization failed, the client or server setup routines should
// have logged, so just exit here.
os.Exit(-1)
}
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)
}
func clientHandler(f base.ClientFactory, conn *pt.SocksConn, proxyURI *url.URL) {
defer conn.Close()
termMon.onHandlerStart()
defer termMon.onHandlerFinish()
name := f.Transport().Name()
addrStr := log.ElideAddr(conn.Req.Target)
log.Infof("%s(%s) - new connection", name, addrStr)
// Deal with arguments.
args, err := f.ParseArgs(&conn.Req.Args)
if err != nil {
log.Errorf("%s(%s) - invalid arguments: %s", name, addrStr, err)
conn.Reject()
return
}
// Obtain the proxy dialer if any, and create the outgoing TCP connection.
var dialFn DialFn
if proxyURI == nil {
dialFn = proxy.Direct.Dial
} else {
// This is unlikely to happen as the proxy protocol is verified during
// the configuration phase.
dialer, err := proxy.FromURL(proxyURI, proxy.Direct)
if err != nil {
log.Errorf("%s(%s) - failed to obtain proxy dialer: %s", name, addrStr, log.ElideError(err))
conn.Reject()
return
}
dialFn = dialer.Dial
}
remoteConn, err := dialFn("tcp", conn.Req.Target) // XXX: Allow UDP?
if err != nil {
log.Errorf("%s(%s) - outgoing connection failed: %s", name, addrStr, log.ElideError(err))
conn.Reject()
return
}
defer remoteConn.Close()
// Instantiate the client transport method, handshake, and start pushing
// bytes back and forth.
remote, err := f.WrapConn(remoteConn, args)
if err != nil {
log.Errorf("%s(%s) - handshake failed: %s", name, addrStr, log.ElideError(err))
conn.Reject()
return
}
err = conn.Grant(remoteConn.RemoteAddr().(*net.TCPAddr))
if err != nil {
log.Errorf("%s(%s) - SOCKS grant 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
}