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annotate src/net/sourceforge/jsocks/SocksSocket.java @ 429:d5f6d6886113

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author Carl Byington <carl@five-ten-sg.com>
date Sun, 14 Dec 2014 19:04:20 -0800
parents 205ee2873330
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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 * SocksSocket tryies to look very similar to normal Socket,
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8 * while allowing connections through the SOCKS4 or 5 proxy.
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9 * To use this class you will have to identify proxy you need
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10 * to use, CProxy class allows you to set default proxy, which
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11 * will be used by all Socks aware sockets. You can also create
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12 * either Socks4Proxy or Socks5Proxy, and use them by passing to the
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13 * appropriate constructors.
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14 * <P>
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15 * Using Socks package can be as easy as that:
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16 *
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17 * <pre><tt>
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18 *
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19 * import Socks.*;
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20 * ....
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21 *
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22 * try{
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23 * //Specify SOCKS5 proxy
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24 * CProxy.setDefaultProxy("socks-proxy",1080);
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25 *
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26 * //OR you still use SOCKS4
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27 * //Code below uses SOCKS4 proxy
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28 * //CProxy.setDefaultProxy("socks-proxy",1080,userName);
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29 *
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30 * Socket s = SocksSocket("some.host.of.mine",13);
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31 * readTimeFromSock(s);
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32 * }catch(SocksException sock_ex){
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33 * //Usually it will turn in more or less meaningfull message
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34 * System.err.println("SocksException:"+sock_ex);
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35 * }
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36 *
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37 * </tt></pre>
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38 *<P>
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39 * However if the need exist for more control, like resolving addresses
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40 * remotely, or using some non-trivial authentication schemes, it can be done.
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41 */
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42
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43 public class SocksSocket extends Socket{
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44 //Data members
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45 protected CProxy proxy;
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46 protected String localHost, remoteHost;
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47 protected InetAddress localIP, remoteIP;
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48 protected int localPort,remotePort;
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49
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50 private Socket directSock = null;
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51
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52 /**
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53 * Tryies to connect to given host and port
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54 * using default proxy. If no default proxy speciefied
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55 * it throws SocksException with error code SOCKS_NO_PROXY.
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56 @param host Machine to connect to.
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57 @param port Port to which to connect.
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58 * @see SocksSocket#SocksSocket(CProxy,String,int)
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59 * @see Socks5Proxy#resolveAddrLocally
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60 */
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61 public SocksSocket(String host,int port)
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62 throws SocksException,UnknownHostException{
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63 this(CProxy.defaultProxy,host,port);
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64 }
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65 /**
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66 * Connects to host port using given proxy server.
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67 @param p CProxy to use.
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68 @param host Machine to connect to.
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69 @param port Port to which to connect.
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70 @throws UnknownHostException
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71 If one of the following happens:
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72 <ol>
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73
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74 <li> CProxy settings say that address should be resolved locally, but
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75 this fails.
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76 <li> CProxy settings say that the host should be contacted directly but
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77 host name can't be resolved.
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78 </ol>
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79 @throws SocksException
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80 If one of the following happens:
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81 <ul>
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82 <li> CProxy is is null.
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83 <li> CProxy settings say that the host should be contacted directly but
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84 this fails.
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85 <li> Socks Server can't be contacted.
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86 <li> Authentication fails.
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87 <li> Connection is not allowed by the SOCKS proxy.
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88 <li> SOCKS proxy can't establish the connection.
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89 <li> Any IO error occured.
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90 <li> Any protocol error occured.
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91 </ul>
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92 @throws IOexception if anything is wrong with I/O.
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93 @see Socks5Proxy#resolveAddrLocally
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94 */
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95 public SocksSocket(CProxy p,String host,int port)
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96 throws SocksException,UnknownHostException{
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97
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98
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99 if(p == null) throw new SocksException(CProxy.SOCKS_NO_PROXY);
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100 //proxy=p;
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101 proxy = p.copy();
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102 remoteHost = host;
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103 remotePort = port;
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104 if(proxy.isDirect(host)){
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105 remoteIP = InetAddress.getByName(host);
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106 doDirect();
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107 }
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108 else
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109 processReply(proxy.connect(host,port));
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110 }
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111
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112
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113 /**
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114 * Tryies to connect to given ip and port
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115 * using default proxy. If no default proxy speciefied
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116 * it throws SocksException with error code SOCKS_NO_PROXY.
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117 @param ip Machine to connect to.
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118 @param port Port to which to connect.
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119 * @see SocksSocket#SocksSocket(CProxy,String,int)
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120 */
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121 public SocksSocket(InetAddress ip, int port) throws SocksException{
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122 this(CProxy.defaultProxy,ip,port);
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123 }
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124
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125 /**
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126 Connects to given ip and port using given CProxy server.
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127 @param p CProxy to use.
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128 @param ip Machine to connect to.
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129 @param port Port to which to connect.
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130
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131 */
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132 public SocksSocket(CProxy p,InetAddress ip, int port) throws SocksException{
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133 if(p == null) throw new SocksException(CProxy.SOCKS_NO_PROXY);
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134 this.proxy = p.copy();
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135 this.remoteIP = ip;
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136 this.remotePort = port;
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137 this.remoteHost = ip.getHostName();
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138 if(proxy.isDirect(remoteIP))
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139 doDirect();
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140 else
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141 processReply(proxy.connect(ip,port));
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142 }
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143
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144
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145 /**
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146 * These 2 constructors are used by the SocksServerSocket.
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147 * This socket simply overrides remoteHost, remotePort
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148 */
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149 protected SocksSocket(String host,int port,CProxy proxy){
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150 this.remotePort = port;
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151 this.proxy = proxy;
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152 this.localIP = proxy.proxySocket.getLocalAddress();
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153 this.localPort = proxy.proxySocket.getLocalPort();
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154 this.remoteHost = host;
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155 }
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156 protected SocksSocket(InetAddress ip,int port,CProxy proxy){
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157 remoteIP = ip;
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158 remotePort = port;
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159 this.proxy = proxy;
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160 this.localIP = proxy.proxySocket.getLocalAddress();
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161 this.localPort = proxy.proxySocket.getLocalPort();
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162 remoteHost = remoteIP.getHostName();
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163 }
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164
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165 /**
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166 * Same as Socket
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167 */
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168 public void close() throws IOException{
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169 if(proxy!= null)proxy.endSession();
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170 proxy = null;
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171 }
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172 /**
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173 * Same as Socket
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174 */
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175 public InputStream getInputStream(){
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176 return proxy.in;
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177 }
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178 /**
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179 * Same as Socket
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180 */
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181 public OutputStream getOutputStream(){
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182 return proxy.out;
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183 }
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184 /**
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185 * Same as Socket
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186 */
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187 public int getPort(){
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188 return remotePort;
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189 }
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190 /**
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191 * Returns remote host name, it is usefull in cases when addresses
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192 * are resolved by proxy, and we can't create InetAddress object.
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193 @return The name of the host this socket is connected to.
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194 */
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195 public String getHost(){
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196 return remoteHost;
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197 }
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198 /**
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199 * Get remote host as InetAddress object, might return null if
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200 * addresses are resolved by proxy, and it is not possible to resolve
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201 * it locally
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202 @return Ip address of the host this socket is connected to, or null
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203 if address was returned by the proxy as DOMAINNAME and can't be
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204 resolved locally.
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205 */
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206 public InetAddress getInetAddress(){
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207 if(remoteIP == null){
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208 try{
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209 remoteIP = InetAddress.getByName(remoteHost);
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210 }catch(UnknownHostException e){
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211 return null;
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212 }
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213 }
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214 return remoteIP;
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215 }
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216
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217 /**
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218 * Get the port assigned by the proxy for the socket, not
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219 * the port on locall machine as in Socket.
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220 @return Port of the socket used on the proxy server.
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221 */
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222 public int getLocalPort(){
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223 return localPort;
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224 }
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225
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226 /**
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227 * Get address assigned by proxy to make a remote connection,
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228 * it might be different from the host specified for the proxy.
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229 * Can return null if socks server returned this address as hostname
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230 * and it can't be resolved locally, use getLocalHost() then.
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231 @return Address proxy is using to make a connection.
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232 */
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233 public InetAddress getLocalAddress(){
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234 if(localIP == null){
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235 try{
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236 localIP = InetAddress.getByName(localHost);
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237 }catch(UnknownHostException e){
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238 return null;
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239 }
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240 }
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241 return localIP;
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242 }
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243 /**
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244 Get name of the host, proxy has assigned to make a remote connection
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245 for this socket. This method is usefull when proxy have returned
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246 address as hostname, and we can't resolve it on this machine.
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247 @return The name of the host proxy is using to make a connection.
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248 */
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249 public String getLocalHost(){
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250 return localHost;
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251 }
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252
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253 /**
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254 Same as socket.
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diff changeset
255 */
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256 public void setSoLinger(boolean on,int val) throws SocketException{
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257 proxy.proxySocket.setSoLinger(on,val);
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258 }
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259 /**
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260 Same as socket.
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diff changeset
261 */
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262 public int getSoLinger(int timeout) throws SocketException{
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263 return proxy.proxySocket.getSoLinger();
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264 }
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265 /**
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266 Same as socket.
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diff changeset
267 */
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268 public void setSoTimeout(int timeout) throws SocketException{
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269 proxy.proxySocket.setSoTimeout(timeout);
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270 }
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diff changeset
271 /**
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272 Same as socket.
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273 */
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274 public int getSoTimeout(int timeout) throws SocketException{
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275 return proxy.proxySocket.getSoTimeout();
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276 }
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diff changeset
277 /**
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278 Same as socket.
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diff changeset
279 */
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280 public void setTcpNoDelay(boolean on) throws SocketException{
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281 proxy.proxySocket.setTcpNoDelay(on);
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282 }
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283 /**
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284 Same as socket.
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diff changeset
285 */
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286 public boolean getTcpNoDelay() throws SocketException{
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287 return proxy.proxySocket.getTcpNoDelay();
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288 }
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289
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diff changeset
290 /**
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diff changeset
291 Get string representation of the socket.
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diff changeset
292 */
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293 public String toString(){
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294 if(directSock!=null) return "Direct connection:"+directSock;
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295 return ("Proxy:"+proxy+";"+"addr:"+remoteHost+",port:"+remotePort
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296 +",localport:"+localPort);
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297
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298 }
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299
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diff changeset
300 //Private Methods
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diff changeset
301 //////////////////
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302
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303 private void processReply(ProxyMessage reply)throws SocksException{
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diff changeset
304 localPort = reply.port;
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diff changeset
305 /*
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parents: 0
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306 * If the server have assigned same host as it was contacted on
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307 * it might return an address of all zeros
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308 */
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309 if(reply.host.equals("0.0.0.0")){
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310 localIP = proxy.proxyIP;
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311 localHost = localIP.getHostName();
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312 }else{
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313 localHost = reply.host;
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314 localIP = reply.ip;
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315 }
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316 }
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317 private void doDirect()throws SocksException{
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318 try{
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319 //System.out.println("IP:"+remoteIP+":"+remotePort);
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320 directSock = new Socket(remoteIP,remotePort);
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321 proxy.out = directSock.getOutputStream();
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322 proxy.in = directSock.getInputStream();
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323 proxy.proxySocket = directSock;
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324 localIP = directSock.getLocalAddress();
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325 localPort = directSock.getLocalPort();
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326 }catch(IOException io_ex){
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327 throw new SocksException(CProxy.SOCKS_DIRECT_FAILED,
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328 "Direct connect failed:"+io_ex);
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329 }
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330 }
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331
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332 }