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annotate src/net/sourceforge/jsocks/Socks5Proxy.java @ 415:885f2bca6032

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author Carl Byington <carl@five-ten-sg.com>
date Mon, 27 Oct 2014 13:55:13 -0700
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1 package net.sourceforge.jsocks;
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2 import java.net.*;
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3 import java.io.*;
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4 import java.util.Hashtable;
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5 import java.util.Enumeration;
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6
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7 /**
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8 SOCKS5 CProxy.
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9 */
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10
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11 public class Socks5Proxy extends CProxy implements Cloneable{
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12
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13 //Data members
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14 private Hashtable authMethods = new Hashtable();
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15 private int selectedMethod;
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16
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17 boolean resolveAddrLocally = true;
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18 UDPEncapsulation udp_encapsulation=null;
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19
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20
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21 //Public Constructors
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22 //====================
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23
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24 /**
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25 Creates SOCKS5 proxy.
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26 @param p CProxy to use to connect to this proxy, allows proxy chaining.
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27 @param proxyHost Host on which a CProxy server runs.
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28 @param proxyPort Port on which a CProxy server listens for connections.
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29 @throws UnknownHostException If proxyHost can't be resolved.
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30 */
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31 public Socks5Proxy(CProxy p,String proxyHost,int proxyPort)
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32 throws UnknownHostException{
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33 super(p,proxyHost,proxyPort);
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34 version = 5;
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35 setAuthenticationMethod(0,new AuthenticationNone());
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36 }
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37
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38 /**
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39 Creates SOCKS5 proxy.
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40 @param proxyHost Host on which a CProxy server runs.
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41 @param proxyPort Port on which a CProxy server listens for connections.
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42 @throws UnknownHostException If proxyHost can't be resolved.
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43 */
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44 public Socks5Proxy(String proxyHost,int proxyPort)
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45 throws UnknownHostException{
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46 this(null,proxyHost,proxyPort);
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47 }
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48
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49
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50 /**
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51 Creates SOCKS5 proxy.
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52 @param p CProxy to use to connect to this proxy, allows proxy chaining.
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53 @param proxyIP Host on which a CProxy server runs.
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54 @param proxyPort Port on which a CProxy server listens for connections.
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55 */
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56 public Socks5Proxy(CProxy p,InetAddress proxyIP,int proxyPort){
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57 super(p,proxyIP,proxyPort);
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58 version = 5;
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59 setAuthenticationMethod(0,new AuthenticationNone());
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60 }
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61
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62 /**
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63 Creates SOCKS5 proxy.
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64 @param proxyIP Host on which a CProxy server runs.
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65 @param proxyPort Port on which a CProxy server listens for connections.
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66 */
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67 public Socks5Proxy(InetAddress proxyIP,int proxyPort){
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68 this(null,proxyIP,proxyPort);
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69 }
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70
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71 //Public instance methods
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72 //========================
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73
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74
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75 /**
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76 * Wether to resolve address locally or to let proxy do so.
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77 <p>
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78 SOCKS5 protocol allows to send host names rather then IPs in the
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79 requests, this option controls wether the hostnames should be send
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80 to the proxy server as names, or should they be resolved locally.
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81 @param doResolve Wether to perform resolution locally.
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82 @return Previous settings.
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83 */
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84 public boolean resolveAddrLocally(boolean doResolve){
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85 boolean old = resolveAddrLocally;
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86 resolveAddrLocally = doResolve;
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87 return old;
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88 }
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89 /**
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90 Get current setting on how the addresses should be handled.
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91 @return Current setting for address resolution.
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92 @see Socks5Proxy#resolveAddrLocally(boolean doResolve)
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93 */
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94 public boolean resolveAddrLocally(){
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95 return resolveAddrLocally;
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96 }
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97
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98 /**
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99 Adds another authentication method.
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100 @param methodId Authentication method id, see rfc1928
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101 @param method Implementation of Authentication
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102 @see Authentication
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103 */
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104 public boolean setAuthenticationMethod(int methodId,
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105 Authentication method){
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106 if(methodId<0 || methodId > 255)
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107 return false;
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108 if(method == null){
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109 //Want to remove a particular method
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110 return (authMethods.remove(new Integer(methodId)) != null);
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111 }else{//Add the method, or rewrite old one
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112 authMethods.put(new Integer(methodId),method);
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113 }
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114 return true;
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115 }
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116
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117 /**
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118 Get authentication method, which corresponds to given method id
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119 @param methodId Authentication method id.
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120 @return Implementation for given method or null, if one was not set.
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121 */
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122 public Authentication getAuthenticationMethod(int methodId){
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123 Object method = authMethods.get(new Integer(methodId));
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124 if(method == null) return null;
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125 return (Authentication)method;
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126 }
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127
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128 /**
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129 Creates a clone of this CProxy.
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130 */
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131 public Object clone(){
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132 Socks5Proxy newProxy = new Socks5Proxy(proxyIP,proxyPort);
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133 newProxy.authMethods = (Hashtable) this.authMethods.clone();
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134 newProxy.directHosts = (InetRange)directHosts.clone();
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135 newProxy.resolveAddrLocally = resolveAddrLocally;
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136 newProxy.chainProxy = chainProxy;
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137 return newProxy;
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138 }
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139
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140 //Public Static(Class) Methods
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141 //==============================
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142
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143
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144 //Protected Methods
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145 //=================
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146
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147 protected CProxy copy(){
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148 Socks5Proxy copy = new Socks5Proxy(proxyIP,proxyPort);
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149 copy.authMethods = this.authMethods; //same Hash, no copy
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150 copy.directHosts = this.directHosts;
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151 copy.chainProxy = this.chainProxy;
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152 copy.resolveAddrLocally = this.resolveAddrLocally;
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153 return copy;
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154 }
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155 /**
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156 *
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157 *
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158 */
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159 protected void startSession()throws SocksException{
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160 super.startSession();
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161 Authentication auth;
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162 Socket ps = proxySocket; //The name is too long
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163
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164 try{
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165
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166 byte nMethods = (byte) authMethods.size(); //Number of methods
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167
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168 byte[] buf = new byte[2+nMethods]; //2 is for VER,NMETHODS
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169 buf[0] = (byte) version;
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170 buf[1] = nMethods; //Number of methods
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171 int i=2;
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172
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173 Enumeration ids = authMethods.keys();
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174 while(ids.hasMoreElements())
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175 buf[i++] = (byte)((Integer)ids.nextElement()).intValue();
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176
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177 out.write(buf);
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178 out.flush();
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179
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180 int versionNumber = in.read();
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181 selectedMethod = in.read();
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182
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183 if(versionNumber < 0 || selectedMethod < 0){
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184 //EOF condition was reached
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185 endSession();
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186 throw(new SocksException(SOCKS_PROXY_IO_ERROR,
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187 "Connection to proxy lost."));
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188 }
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189 if(versionNumber < version){
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190 //What should we do??
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191 }
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192 if(selectedMethod == 0xFF){ //No method selected
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193 ps.close();
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194 throw ( new SocksException(SOCKS_AUTH_NOT_SUPPORTED));
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195 }
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196
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197 auth = getAuthenticationMethod(selectedMethod);
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198 if(auth == null){
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199 //This shouldn't happen, unless method was removed by other
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200 //thread, or the server stuffed up
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201 throw(new SocksException(SOCKS_JUST_ERROR,
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202 "Speciefied Authentication not found!"));
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203 }
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204 Object[] in_out = auth.doSocksAuthentication(selectedMethod,ps);
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205 if(in_out == null){
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206 //Authentication failed by some reason
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207 throw(new SocksException(SOCKS_AUTH_FAILURE));
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208 }
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209 //Most authentication methods are expected to return
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210 //simply the input/output streams associated with
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211 //the socket. However if the auth. method requires
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212 //some kind of encryption/decryption being done on the
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213 //connection it should provide classes to handle I/O.
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214
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215 in = (InputStream) in_out[0];
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216 out = (OutputStream) in_out[1];
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217 if(in_out.length > 2)
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218 udp_encapsulation = (UDPEncapsulation) in_out[2];
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219
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220 }catch(SocksException s_ex){
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221 throw s_ex;
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222 }catch(UnknownHostException uh_ex){
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223 throw(new SocksException(SOCKS_PROXY_NO_CONNECT));
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224 }catch(SocketException so_ex){
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225 throw(new SocksException(SOCKS_PROXY_NO_CONNECT));
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226 }catch(IOException io_ex){
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227 //System.err.println(io_ex);
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228 throw(new SocksException(SOCKS_PROXY_IO_ERROR,""+io_ex));
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229 }
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230 }
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231
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232 protected ProxyMessage formMessage(int cmd,InetAddress ip,int port){
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233 return new Socks5Message(cmd,ip,port);
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234 }
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235 protected ProxyMessage formMessage(int cmd,String host,int port)
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236 throws UnknownHostException{
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237 if(resolveAddrLocally)
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238 return formMessage(cmd,InetAddress.getByName(host),port);
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239 else
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240 return new Socks5Message(cmd,host,port);
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241 }
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242 protected ProxyMessage formMessage(InputStream in)
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243 throws SocksException,
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244 IOException{
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245 return new Socks5Message(in);
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246 }
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247
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248 }