mirror of
https://github.com/cbeuw/Cloak.git
synced 2024-10-23 15:46:25 +00:00
336 lines
8.3 KiB
Go
336 lines
8.3 KiB
Go
package main
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import (
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"bytes"
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"crypto/rand"
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"encoding/base64"
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"flag"
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"fmt"
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"io"
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"net"
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"net/http"
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_ "net/http/pprof"
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"os"
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"runtime"
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"strings"
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"time"
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mux "github.com/cbeuw/Cloak/internal/multiplex"
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"github.com/cbeuw/Cloak/internal/server"
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"github.com/cbeuw/Cloak/internal/util"
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log "github.com/sirupsen/logrus"
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)
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var b64 = base64.StdEncoding.EncodeToString
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var version string
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func dispatchConnection(conn net.Conn, sta *server.State) {
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remoteAddr := conn.RemoteAddr()
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var err error
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buf := make([]byte, 1500)
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// TODO: potential fingerprint for active probers here
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conn.SetReadDeadline(time.Now().Add(3 * time.Second))
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i, err := io.ReadAtLeast(conn, buf, 1)
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if err != nil {
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go conn.Close()
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return
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}
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conn.SetReadDeadline(time.Time{})
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data := buf[:i]
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goWeb := func() {
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_, remotePort, _ := net.SplitHostPort(conn.LocalAddr().String())
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webConn, err := net.Dial("tcp", net.JoinHostPort(sta.RedirAddr.String(), remotePort))
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if err != nil {
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log.Errorf("Making connection to redirection server: %v", err)
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return
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}
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_, err = webConn.Write(data)
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if err != nil {
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log.Error("Failed to send first packet to redirection server", err)
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}
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go util.Pipe(webConn, conn, 0)
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go util.Pipe(conn, webConn, 0)
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}
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ci, finishHandshake, err := server.PrepareConnection(data, sta, conn)
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if err != nil {
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log.WithFields(log.Fields{
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"remoteAddr": remoteAddr,
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"UID": b64(ci.UID),
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"sessionId": ci.SessionId,
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"proxyMethod": ci.ProxyMethod,
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"encryptionMethod": ci.EncryptionMethod,
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}).Warn(err)
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goWeb()
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return
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}
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sessionKey := make([]byte, 32)
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rand.Read(sessionKey)
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obfuscator, err := mux.GenerateObfs(ci.EncryptionMethod, sessionKey, ci.Transport.HasRecordLayer())
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if err != nil {
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log.Error(err)
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goWeb()
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return
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}
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// adminUID can use the server as normal with unlimited QoS credits. The adminUID is not
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// added to the userinfo database. The distinction between going into the admin mode
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// and normal proxy mode is that sessionID needs == 0 for admin mode
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if bytes.Equal(ci.UID, sta.AdminUID) && ci.SessionId == 0 {
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preparedConn, err := finishHandshake(sessionKey)
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if err != nil {
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log.Error(err)
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return
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}
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log.Trace("finished handshake")
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seshConfig := &mux.SessionConfig{
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Obfuscator: obfuscator,
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Valve: nil,
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UnitRead: ci.Transport.UnitReadFunc(),
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}
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sesh := mux.MakeSession(0, seshConfig)
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sesh.AddConnection(preparedConn)
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//TODO: Router could be nil in cnc mode
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log.WithField("remoteAddr", preparedConn.RemoteAddr()).Info("New admin session")
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err = http.Serve(sesh, sta.LocalAPIRouter)
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if err != nil {
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log.Error(err)
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return
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}
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}
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var user *server.ActiveUser
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if sta.IsBypass(ci.UID) {
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user, err = sta.Panel.GetBypassUser(ci.UID)
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} else {
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user, err = sta.Panel.GetUser(ci.UID)
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}
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if err != nil {
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log.WithFields(log.Fields{
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"UID": b64(ci.UID),
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"remoteAddr": remoteAddr,
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"error": err,
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}).Warn("+1 unauthorised UID")
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goWeb()
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return
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}
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seshConfig := &mux.SessionConfig{
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Obfuscator: obfuscator,
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Valve: nil,
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UnitRead: ci.Transport.UnitReadFunc(),
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Unordered: ci.Unordered,
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}
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sesh, existing, err := user.GetSession(ci.SessionId, seshConfig)
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if err != nil {
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user.CloseSession(ci.SessionId, "")
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log.Error(err)
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return
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}
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if existing {
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preparedConn, err := finishHandshake(sesh.SessionKey)
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if err != nil {
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log.Error(err)
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return
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}
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log.Trace("finished handshake")
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sesh.AddConnection(preparedConn)
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return
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}
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preparedConn, err := finishHandshake(sessionKey)
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if err != nil {
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log.Error(err)
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return
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}
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log.Trace("finished handshake")
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log.WithFields(log.Fields{
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"UID": b64(ci.UID),
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"sessionID": ci.SessionId,
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}).Info("New session")
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sesh.AddConnection(preparedConn)
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for {
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newStream, err := sesh.Accept()
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if err != nil {
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if err == mux.ErrBrokenSession {
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log.WithFields(log.Fields{
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"UID": b64(ci.UID),
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"sessionID": ci.SessionId,
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"reason": sesh.TerminalMsg(),
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}).Info("Session closed")
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user.CloseSession(ci.SessionId, "")
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return
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} else {
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// TODO: other errors
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continue
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}
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}
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proxyAddr := sta.ProxyBook[ci.ProxyMethod]
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localConn, err := net.Dial(proxyAddr.Network(), proxyAddr.String())
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if err != nil {
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log.Errorf("Failed to connect to %v: %v", ci.ProxyMethod, err)
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user.CloseSession(ci.SessionId, "Failed to connect to proxy server")
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continue
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}
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log.Tracef("%v endpoint has been successfully connected", ci.ProxyMethod)
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go util.Pipe(localConn, newStream, 0)
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go util.Pipe(newStream, localConn, sta.Timeout)
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}
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}
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func main() {
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// set TLS bind host through commandline for legacy support, default 0.0.0,0
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var ssRemoteHost string
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// set TLS bind port through commandline for legacy support, default 443
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var ssRemotePort string
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var config string
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var pluginMode bool
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if os.Getenv("SS_LOCAL_HOST") != "" && os.Getenv("SS_LOCAL_PORT") != "" {
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pluginMode = true
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ssRemoteHost = os.Getenv("SS_REMOTE_HOST")
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ssRemotePort = os.Getenv("SS_REMOTE_PORT")
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config = os.Getenv("SS_PLUGIN_OPTIONS")
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} else {
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flag.StringVar(&config, "c", "server.json", "config: path to the configuration file or its content")
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askVersion := flag.Bool("v", false, "Print the version number")
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printUsage := flag.Bool("h", false, "Print this message")
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genUID := flag.Bool("u", false, "Generate a UID")
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genKeyPair := flag.Bool("k", false, "Generate a pair of public and private key, output in the format of pubkey,pvkey")
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pprofAddr := flag.String("d", "", "debug use: ip:port to be listened by pprof profiler")
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verbosity := flag.String("verbosity", "info", "verbosity level")
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flag.Parse()
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if *askVersion {
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fmt.Printf("ck-server %s", version)
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return
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}
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if *printUsage {
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flag.Usage()
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return
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}
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if *genUID {
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fmt.Println(generateUID())
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return
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}
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if *genKeyPair {
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pub, pv := generateKeyPair()
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fmt.Printf("%v,%v", pub, pv)
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return
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}
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if *pprofAddr != "" {
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runtime.SetBlockProfileRate(5)
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go func() {
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log.Info(http.ListenAndServe(*pprofAddr, nil))
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}()
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log.Infof("pprof listening on %v", *pprofAddr)
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}
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lvl, err := log.ParseLevel(*verbosity)
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if err != nil {
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log.Fatal(err)
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}
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log.SetLevel(lvl)
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log.Infof("Starting standalone mode")
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}
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sta, _ := server.InitState(time.Now)
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err := sta.ParseConfig(config)
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if err != nil {
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log.Fatalf("Configuration file error: %v", err)
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}
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if !pluginMode && len(sta.BindAddr) == 0 {
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https, _ := net.ResolveTCPAddr("tcp", ":443")
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http, _ := net.ResolveTCPAddr("tcp", ":80")
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sta.BindAddr = []net.Addr{https, http}
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log.Fatalf("BindAddr cannot be empty")
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}
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// when cloak is started as a shadowsocks plugin
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if pluginMode {
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ssLocalHost := os.Getenv("SS_LOCAL_HOST")
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ssLocalPort := os.Getenv("SS_LOCAL_PORT")
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sta.ProxyBook["shadowsocks"], err = net.ResolveTCPAddr("tcp", net.JoinHostPort(ssLocalHost, ssLocalPort))
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if err != nil {
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log.Fatal(err)
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}
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var ssBind string
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// When listening on an IPv6 and IPv4, SS gives REMOTE_HOST as e.g. ::|0.0.0.0
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v4nv6 := len(strings.Split(ssRemoteHost, "|")) == 2
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if v4nv6 {
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ssBind = ":" + ssRemotePort
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} else {
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ssBind = net.JoinHostPort(ssRemoteHost, ssRemotePort)
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}
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ssBindAddr, err := net.ResolveTCPAddr("tcp", ssBind)
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if err != nil {
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log.Fatalf("unable to resolve bind address provided by SS: %v", err)
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}
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shouldAppend := true
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for i, addr := range sta.BindAddr {
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if addr.String() == ssBindAddr.String() {
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shouldAppend = false
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}
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if addr.String() == ":"+ssRemotePort { // already listening on all interfaces
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shouldAppend = false
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}
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if addr.String() == "0.0.0.0:"+ssRemotePort || addr.String() == "[::]:"+ssRemotePort {
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// if config listens on one ip version but ss wants to listen on both,
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// listen on both
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if ssBindAddr.String() == ":"+ssRemotePort {
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shouldAppend = true
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sta.BindAddr[i] = ssBindAddr
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}
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}
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}
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if shouldAppend {
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sta.BindAddr = append(sta.BindAddr, ssBindAddr)
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}
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}
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listen := func(bindAddr net.Addr) {
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listener, err := net.Listen("tcp", bindAddr.String())
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log.Infof("Listening on %v", bindAddr)
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if err != nil {
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log.Fatal(err)
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}
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for {
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conn, err := listener.Accept()
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if err != nil {
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log.Errorf("%v", err)
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continue
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}
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go dispatchConnection(conn, sta)
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}
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}
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for i, addr := range sta.BindAddr {
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if i != len(sta.BindAddr)-1 {
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go listen(addr)
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} else {
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listen(addr)
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}
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}
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}
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