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annotate src/net/sourceforge/jsocks/Socks5Proxy.java @ 429:d5f6d6886113
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author | Carl Byington <carl@five-ten-sg.com> |
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date | Sun, 14 Dec 2014 19:04:20 -0800 |
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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 } |