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Merge pull request shadowsocks#144 from lixin9311/SIP003
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "log" | ||
| "os" | ||
| ) | ||
|
|
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| var logger = log.New(os.Stderr, "", log.Lshortfile|log.LstdFlags) | ||
|
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| func logf(f string, v ...interface{}) { | ||
| if config.Verbose { | ||
| logger.Output(2, fmt.Sprintf(f, v...)) | ||
| } | ||
| } | ||
|
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| type logHelper struct { | ||
| prefix string | ||
| } | ||
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| func (l *logHelper) Write(p []byte) (n int, err error) { | ||
| if config.Verbose { | ||
| logger.Printf("%s%s\n", l.prefix, p) | ||
| return len(p), nil | ||
| } | ||
| return | ||
| } | ||
|
|
||
| func newLogHelper(prefix string) *logHelper { | ||
| return &logHelper{prefix} | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net" | ||
| "os" | ||
| "os/exec" | ||
| ) | ||
|
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||
| func startPlugin(plugin, pluginOpts, ssAddr string, isServer bool) (newAddr string, err error) { | ||
| logf("starting plugin (%s) with option (%s)....", plugin, pluginOpts) | ||
| freePort, err := getFreePort() | ||
| if err != nil { | ||
| return "", fmt.Errorf("failed to fetch an unused port for plugin (%v)", err) | ||
| } | ||
| localHost := "127.0.0.1" | ||
| ssHost, ssPort, err := net.SplitHostPort(ssAddr) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| newAddr = localHost + ":" + freePort | ||
| if isServer { | ||
| if ssHost == "" { | ||
| ssHost = "0.0.0.0" | ||
| } | ||
| logf("plugin (%s) will listen on %s:%s", plugin, ssHost, ssPort) | ||
| } else { | ||
| logf("plugin (%s) will listen on %s:%s", plugin, localHost, freePort) | ||
| } | ||
| err = execPlugin(plugin, pluginOpts, ssHost, ssPort, localHost, freePort) | ||
| return | ||
| } | ||
|
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| func execPlugin(plugin, pluginOpts, remoteHost, remotePort, localHost, localPort string) error { | ||
| if fileExists(plugin) { | ||
| plugin = "./" + plugin | ||
| } | ||
| logH := newLogHelper("[" + plugin + "]: ") | ||
| env := append(os.Environ(), | ||
| "SS_REMOTE_HOST="+remoteHost, | ||
| "SS_REMOTE_PORT="+remotePort, | ||
| "SS_LOCAL_HOST="+localHost, | ||
| "SS_LOCAL_PORT="+localPort, | ||
| "SS_PLUGIN_OPTIONS="+pluginOpts, | ||
| ) | ||
| cmd := &exec.Cmd{ | ||
| Path: plugin, | ||
| Args: []string{plugin}, | ||
| Env: env, | ||
| Stdout: logH, | ||
| Stderr: logH, | ||
| } | ||
| if err := cmd.Start(); err != nil { | ||
| return err | ||
| } | ||
| go func() { | ||
| if err := cmd.Wait(); err != nil { | ||
| logf("plugin exited (%v)\n", err) | ||
| os.Exit(2) | ||
| } | ||
| logf("plugin exited\n") | ||
| os.Exit(0) | ||
| }() | ||
| return nil | ||
| } | ||
|
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| func fileExists(filename string) bool { | ||
| info, err := os.Stat(filename) | ||
| if os.IsNotExist(err) { | ||
| return false | ||
| } | ||
| return !info.IsDir() | ||
| } | ||
|
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| func getFreePort() (string, error) { | ||
| addr, err := net.ResolveTCPAddr("tcp", "localhost:0") | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
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| l, err := net.ListenTCP("tcp", addr) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| port := fmt.Sprintf("%d", l.Addr().(*net.TCPAddr).Port) | ||
| l.Close() | ||
| return port, nil | ||
| } |