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/*
* Copyright (c) 2014-2015, Yawning Angel <yawning at torproject dot org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
// Go language Tor Pluggable Transport suite. Works only as a managed
// client/server.
package main
import (
"flag"
"fmt"
golog "log"
"net"
"os"
"path"
"syscall"
"git.torproject.org/pluggable-transports/goptlib.git"
"github.com/OperatorFoundation/obfs4/common/log"
"github.com/OperatorFoundation/obfs4/common/termmon"
"github.com/OperatorFoundation/obfs4/common/pt_extras"
"github.com/OperatorFoundation/obfs4/transports"
"github.com/OperatorFoundation/obfs4/proxies/proxy_socks5"
"github.com/OperatorFoundation/obfs4/proxies/proxy_transparent"
"github.com/OperatorFoundation/obfs4/proxies/proxy_transparent_udp"
)
const (
obfs4proxyVersion = "0.0.7-dev"
obfs4proxyLogFile = "obfs4proxy.log"
socksAddr = "127.0.0.1:0"
)
var stateDir string
var termMon *termmon.TermMonitor
func getVersion() string {
return fmt.Sprintf("obfs4proxy-%s", obfs4proxyVersion)
}
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 {
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())
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 {
launched = proxy_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 {
launched = proxy_transparent_udp.ServerSetup(termMon, *bindAddr)
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 = proxy_transparent.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 = proxy_transparent.ServerSetup(termMon, *bindAddr)
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 = proxy_socks5.ClientSetup(termMon)
} else {
log.Infof("%s - initializing server transport listeners", execName)
launched, ptListeners = proxy_socks5.ServerSetup(termMon)
}
}
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 checkIsClient(client bool, server bool) (bool, error) {
if client {
return true, nil
} else if server {
return false, nil
} else {
return pt_extras.PtIsClient()
}
}
func makeStateDir(statePath string) (string, error) {
if statePath != "" {
err := os.MkdirAll(statePath, 0700)
return statePath, err
} else {
return pt.MakeStateDir()
}
}
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