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annotate src/net/sourceforge/jsocks/SocksServerSocket.java @ 381:95188bd4badb

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author Carl Byington <carl@five-ten-sg.com>
date Wed, 06 Aug 2014 10:38:50 -0700
parents 205ee2873330
children
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1 package net.sourceforge.jsocks;
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2
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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 SocksServerSocket allows to accept connections from one particular
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8 host through the SOCKS4 or SOCKS5 proxy.
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9 */
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10 public class SocksServerSocket extends ServerSocket{
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11 //Data members
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12 protected CProxy proxy;
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13 protected String localHost;
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14 protected InetAddress localIP;
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15 protected int localPort;
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16
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17 boolean doing_direct = false;
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18 InetAddress remoteAddr;
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19
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20 /**
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21 * Creates ServerSocket capable of accepting one connection
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22 * through the firewall, uses default CProxy.
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23 *@param host Host from which the connection should be recieved.
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24 *@param port Port number of the primary connection.
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25 */
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26 public SocksServerSocket(String host,int port)
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27 throws SocksException,UnknownHostException,IOException{
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28 this(CProxy.defaultProxy,host,port);
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29 }
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30 /**
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31 *Creates ServerSocket capable of accepting one connection
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32 *through the firewall, uses given proxy.
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33 *@param p CProxy object to use.
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34 *@param host Host from which the connection should be recieved.
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35 *@param port Port number of the primary connection.
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36 */
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37 public SocksServerSocket(CProxy p,String host,int port)
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38 throws SocksException,UnknownHostException,IOException{
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39
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40
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41 super(0);
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42 if(p == null) throw new SocksException(CProxy.SOCKS_NO_PROXY);
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43 //proxy=p;
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44 proxy = p.copy();
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45 if(proxy.isDirect(host)){
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46 remoteAddr = InetAddress.getByName(host);
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47 proxy = null;
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48 doDirect();
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49 }else{
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50 processReply(proxy.bind(host,port));
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51 }
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52 }
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53
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54 /**
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55 * Creates ServerSocket capable of accepting one connection
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56 * through the firewall, uses default CProxy.
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57 *@param ip Host from which the connection should be recieved.
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58 *@param port Port number of the primary connection.
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59 */
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60 public SocksServerSocket(InetAddress ip, int port) throws SocksException,
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61 IOException{
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62 this(CProxy.defaultProxy,ip,port);
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63 }
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64
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65 /**
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66 *Creates ServerSocket capable of accepting one connection
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67 *through the firewall, uses given proxy.
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68 *@param p CProxy object to use.
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69 *@param ip Host from which the connection should be recieved.
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70 *@param port Port number of the primary connection.
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71 */
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72 public SocksServerSocket(CProxy p,InetAddress ip, int port)
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73 throws SocksException,IOException{
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74 super(0);
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75
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76 if(p == null) throw new SocksException(CProxy.SOCKS_NO_PROXY);
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77 this.proxy = p.copy();
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78
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79 if(proxy.isDirect(ip)){
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80 remoteAddr = ip;
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81 doDirect();
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82 }else{
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83 processReply(proxy.bind(ip,port));
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84 }
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85 }
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86
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87
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88 /**
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89 * Accepts the incoming connection.
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90 */
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91 public Socket accept() throws IOException{
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92 Socket s;
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93
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94 if(!doing_direct){
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95 if(proxy == null) return null;
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96
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97 ProxyMessage msg = proxy.accept();
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98 s = msg.ip == null? new SocksSocket(msg.host,msg.port,proxy)
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99 : new SocksSocket(msg.ip,msg.port,proxy);
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100 //Set timeout back to 0
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101 proxy.proxySocket.setSoTimeout(0);
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102 }else{ //Direct Connection
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103
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104 //Mimic the proxy behaviour,
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105 //only accept connections from the speciefed host.
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106 while(true){
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107 s = super.accept();
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108 if(s.getInetAddress().equals(remoteAddr)){
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109 //got the connection from the right host
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110 //Close listenning socket.
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111 break;
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112 }else
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113 s.close(); //Drop all connections from other hosts
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114 }
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115
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116 }
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117 proxy = null;
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118 //Return accepted socket
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119 return s;
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120 }
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121
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122 /**
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123 * Closes the connection to proxy if socket have not been accepted, if
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124 * the direct connection is used, closes direct ServerSocket. If the
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125 * client socket have been allready accepted, does nothing.
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126 */
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127 public void close() throws IOException{
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128 super.close();
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129 if(proxy != null) proxy.endSession();
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130 proxy = null;
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131 }
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132
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133 /**
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134 Get the name of the host proxy is using to listen for incoming
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135 connection.
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136 <P>
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137 Usefull when address is returned by proxy as the hostname.
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138 @return the hostname of the address proxy is using to listen
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139 for incoming connection.
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140 */
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141 public String getHost(){
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142 return localHost;
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143 }
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144
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145 /**
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146 * Get address assigned by proxy to listen for incomming
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147 * connections, or the local machine address if doing direct
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148 * connection.
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149 */
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150 public InetAddress getInetAddress(){
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151 if(localIP == null){
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152 try{
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153 localIP = InetAddress.getByName(localHost);
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154 }catch(UnknownHostException e){
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155 return null;
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156 }
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157 }
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158 return localIP;
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159 }
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160
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161 /**
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162 * Get port assigned by proxy to listen for incoming connections, or
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163 the port chosen by local system, if accepting directly.
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164 */
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165 public int getLocalPort(){
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166 return localPort;
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167 }
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168
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169 /**
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170 Set Timeout.
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171
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172 @param timeout Amount of time in milliseconds, accept should wait for
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173 incoming connection before failing with exception.
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174 Zero timeout implies infinity.
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175 */
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176 public void setSoTimeout(int timeout) throws SocketException{
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177 super.setSoTimeout(timeout);
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178 if(!doing_direct) proxy.proxySocket.setSoTimeout(timeout);
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179 }
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180
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181
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182 //Private Methods
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183 //////////////////
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184
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185 private void processReply(ProxyMessage reply)throws SocksException{
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186 localPort = reply.port;
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187 /*
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188 * If the server have assigned same host as it was contacted on
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189 * it might return an address of all zeros
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190 */
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191 if(reply.host.equals("0.0.0.0")){
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192 localIP = proxy.proxyIP;
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193 localHost = localIP.getHostName();
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194 }else{
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195 localHost = reply.host;
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196 localIP = reply.ip;
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197 }
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198 }
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199
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200 private void doDirect(){
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201 doing_direct = true;
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202 localPort = super.getLocalPort();
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203 localIP = super.getInetAddress();
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204 localHost = localIP.getHostName();
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205 }
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206
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207 }