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annotate src/net/sourceforge/jsocks/UDPRelayServer.java @ 372:20d0a1356c43

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author Carl Byington <carl@five-ten-sg.com>
date Mon, 04 Aug 2014 12:11:12 -0700
parents 205ee2873330
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1 package net.sourceforge.jsocks;
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2 import net.sourceforge.jsocks.server.*;
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3 import java.net.*;
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4 import java.io.*;
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5
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6 /**
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7 UDP Relay server, used by ProxyServer to perform udp forwarding.
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8 */
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9 class UDPRelayServer implements Runnable{
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10
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11
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12 DatagramSocket client_sock;
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13 DatagramSocket remote_sock;
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14
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15 Socket controlConnection;
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16
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17 int relayPort;
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18 InetAddress relayIP;
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19
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20 Thread pipe_thread1,pipe_thread2;
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21 Thread master_thread;
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22
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23 ServerAuthenticator auth;
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24
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25 long lastReadTime;
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26
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27 static PrintStream log = null;
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28 static CProxy proxy = null;
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29 static int datagramSize = 0xFFFF;//64K, a bit more than max udp size
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30 static int iddleTimeout = 180000;//3 minutes
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31
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32
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33 /**
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34 Constructs UDP relay server to communicate with client
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35 on given ip and port.
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36 @param clientIP Address of the client from whom datagrams
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37 will be recieved and to whom they will be forwarded.
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38 @param clientPort Clients port.
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39 @param master_thread Thread which will be interrupted, when
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40 UDP relay server stoppes for some reason.
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41 @param controlConnection Socket which will be closed, before
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42 interrupting the master thread, it is introduced due to a bug
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43 in windows JVM which does not throw InterruptedIOException in
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44 threads which block in I/O operation.
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45 */
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46 public UDPRelayServer(InetAddress clientIP,int clientPort,
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47 Thread master_thread,
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48 Socket controlConnection,
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49 ServerAuthenticator auth)
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50 throws IOException{
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51 this.master_thread = master_thread;
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52 this.controlConnection = controlConnection;
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53 this.auth = auth;
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54
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55 client_sock = new Socks5DatagramSocket(true,auth.getUdpEncapsulation(),
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56 clientIP,clientPort);
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57 relayPort = client_sock.getLocalPort();
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58 relayIP = client_sock.getLocalAddress();
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59
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60 if(relayIP.getHostAddress().equals("0.0.0.0"))
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61 relayIP = InetAddress.getLocalHost();
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62
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63 if(proxy == null)
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64 remote_sock = new DatagramSocket();
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65 else
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66 remote_sock = new Socks5DatagramSocket(proxy,0,null);
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67 }
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68
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69
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70 //Public methods
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71 /////////////////
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72
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73
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74 /**
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75 Sets the timeout for UDPRelay server.<br>
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76 Zero timeout implies infinity.<br>
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77 Default timeout is 3 minutes.
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78 */
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79
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80 static public void setTimeout(int timeout){
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81 iddleTimeout = timeout;
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82 }
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83
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84
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85 /**
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86 Sets the size of the datagrams used in the UDPRelayServer.<br>
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87 Default size is 64K, a bit more than maximum possible size of the
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88 datagram.
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89 */
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90 static public void setDatagramSize(int size){
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91 datagramSize = size;
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92 }
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93
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94 /**
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95 Port to which client should send datagram for association.
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96 */
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97 public int getRelayPort(){
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98 return relayPort;
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99 }
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100 /**
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101 IP address to which client should send datagrams for association.
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102 */
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103 public InetAddress getRelayIP(){
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104 return relayIP;
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105 }
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106
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107 /**
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108 Starts udp relay server.
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109 Spawns two threads of execution and returns.
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110 */
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111 public void start() throws IOException{
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112 remote_sock.setSoTimeout(iddleTimeout);
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113 client_sock.setSoTimeout(iddleTimeout);
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114
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115 log("Starting UDP relay server on "+relayIP+":"+relayPort);
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116 log("Remote socket "+remote_sock.getLocalAddress()+":"+
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117 remote_sock.getLocalPort());
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118
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119 pipe_thread1 = new Thread(this,"pipe1");
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120 pipe_thread2 = new Thread(this,"pipe2");
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121
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122 lastReadTime = System.currentTimeMillis();
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123
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124 pipe_thread1.start();
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125 pipe_thread2.start();
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126 }
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127
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128 /**
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129 Stops Relay server.
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130 <p>
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131 Does not close control connection, does not interrupt master_thread.
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132 */
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133 public synchronized void stop(){
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134 master_thread = null;
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135 controlConnection = null;
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136 abort();
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137 }
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138
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139 //Runnable interface
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140 ////////////////////
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141 public void run(){
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142 try{
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143 if(Thread.currentThread().getName().equals("pipe1"))
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144 pipe(remote_sock,client_sock,false);
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145 else
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146 pipe(client_sock,remote_sock,true);
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147 }catch(IOException ioe){
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148 }finally{
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149 abort();
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150 log("UDP Pipe thread "+Thread.currentThread().getName()+" stopped.");
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151 }
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152
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153 }
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154
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155 //Private methods
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156 /////////////////
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157 private synchronized void abort(){
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158 if(pipe_thread1 == null) return;
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159
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160 log("Aborting UDP Relay Server");
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161
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162 remote_sock.close();
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163 client_sock.close();
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164
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165 if(controlConnection != null)
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166 try{ controlConnection.close();} catch(IOException ioe){}
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167
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168 if(master_thread!=null) master_thread.interrupt();
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169
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170 pipe_thread1.interrupt();
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171 pipe_thread2.interrupt();
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172
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173 pipe_thread1 = null;
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174 }
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175
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176
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177 static private void log(String s){
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178 if(log != null){
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179 log.println(s);
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180 log.flush();
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181 }
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182 }
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183
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184 private void pipe(DatagramSocket from,DatagramSocket to,boolean out)
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185 throws IOException{
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186 byte[] data = new byte[datagramSize];
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187 DatagramPacket dp = new DatagramPacket(data,data.length);
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188
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189 while(true){
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190 try{
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191 from.receive(dp);
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192 lastReadTime = System.currentTimeMillis();
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193
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194 if(auth.checkRequest(dp,out))
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195 to.send(dp);
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196
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197 }catch(UnknownHostException uhe){
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198 log("Dropping datagram for unknown host");
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199 }catch(InterruptedIOException iioe){
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200 //log("Interrupted: "+iioe);
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201 //If we were interrupted by other thread.
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202 if(iddleTimeout == 0) return;
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203
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204 //If last datagram was received, long time ago, return.
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205 long timeSinceRead = System.currentTimeMillis() - lastReadTime;
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206 if(timeSinceRead >= iddleTimeout -100) //-100 for adjustment
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207 return;
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208 }
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209 dp.setLength(data.length);
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210 }
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211 }
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212 }