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annotate src/net/sourceforge/jsocks/Socks5Message.java @ 386:e481699db6b1

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author Carl Byington <carl@five-ten-sg.com>
date Wed, 06 Aug 2014 11:50:10 -0700
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1 package net.sourceforge.jsocks;
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2
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3 import java.io.IOException;
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4 import java.io.InputStream;
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5 import java.io.OutputStream;
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6 import java.io.DataInputStream;
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7 import java.net.InetAddress;
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8 import java.net.UnknownHostException;
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9
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10 /**
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11 SOCKS5 request/response message.
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12 */
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13
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14 public class Socks5Message extends ProxyMessage{
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15 /** Address type of given message*/
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16 public int addrType;
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17
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18 byte[] data;
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19
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20 /**
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21 Server error response.
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22 @param cmd Error code.
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23 */
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24 public Socks5Message(int cmd){
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25 super(cmd,null,0);
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26 data = new byte[3];
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27 data[0] = SOCKS_VERSION; //Version.
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28 data[1] = (byte)cmd; //Reply code for some kind of failure.
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29 data[2] = 0; //Reserved byte.
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30 }
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31
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32 /**
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33 Construct client request or server response.
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34 @param cmd - Request/Response code.
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35 @param ip - IP field.
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36 @paarm port - port field.
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37 */
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38 public Socks5Message(int cmd,InetAddress ip,int port){
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39 super(cmd,ip,port);
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40 this.host = ip==null?"0.0.0.0":ip.getHostName();
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41 this.version = SOCKS_VERSION;
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42
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43 byte[] addr;
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44
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45 if(ip == null){
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46 addr = new byte[4];
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47 addr[0]=addr[1]=addr[2]=addr[3]=0;
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48 }else
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49 addr = ip.getAddress();
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50
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51 addrType = addr.length == 4 ? SOCKS_ATYP_IPV4
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52 : SOCKS_ATYP_IPV6;
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53
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54 data = new byte[6+addr.length];
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55 data[0] = (byte) SOCKS_VERSION; //Version
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56 data[1] = (byte) command; //Command
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57 data[2] = (byte) 0; //Reserved byte
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58 data[3] = (byte) addrType; //Address type
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59
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60 //Put Address
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61 System.arraycopy(addr,0,data,4,addr.length);
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62 //Put port
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63 data[data.length-2] = (byte)(port>>8);
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64 data[data.length-1] = (byte)(port);
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65 }
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66
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67
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68 /**
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69 Construct client request or server response.
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70 @param cmd - Request/Response code.
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71 @param hostName - IP field as hostName, uses ADDR_TYPE of HOSTNAME.
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72 @paarm port - port field.
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73 */
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74 public Socks5Message(int cmd,String hostName,int port){
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75 super(cmd,null,port);
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76 this.host = hostName;
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77 this.version = SOCKS_VERSION;
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78
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79 //System.out.println("Doing ATYP_DOMAINNAME");
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80
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81 addrType = SOCKS_ATYP_DOMAINNAME;
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82 byte addr[] = hostName.getBytes();
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83
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84 data =new byte[7+addr.length];
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85 data[0] = (byte) SOCKS_VERSION; //Version
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86 data[1] = (byte) command; //Command
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87 data[2] = (byte) 0; //Reserved byte
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88 data[3] = (byte) SOCKS_ATYP_DOMAINNAME; //Address type
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89 data[4] = (byte) addr.length; //Length of the address
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90
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91 //Put Address
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92 System.arraycopy(addr,0,data,5,addr.length);
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93 //Put port
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94 data[data.length-2] = (byte)(port >>8);
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95 data[data.length-1] = (byte)(port);
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96 }
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97
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98 /**
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99 Initialises Message from the stream. Reads server response from
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100 given stream.
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101 @param in Input stream to read response from.
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102 @throws SocksException If server response code is not SOCKS_SUCCESS(0), or
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103 if any error with protocol occurs.
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104 @throws IOException If any error happens with I/O.
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105 */
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106 public Socks5Message(InputStream in) throws SocksException,
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107 IOException{
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108 this(in,true);
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109 }
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110
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111 /**
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112 Initialises Message from the stream. Reads server response or client
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113 request from given stream.
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114
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115 @param in Input stream to read response from.
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116 @param clinetMode If true read server response, else read client request.
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117 @throws SocksException If server response code is not SOCKS_SUCCESS(0) and
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118 reading in client mode, or if any error with protocol occurs.
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119 @throws IOException If any error happens with I/O.
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120 */
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121 public Socks5Message(InputStream in,boolean clientMode)throws SocksException,
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122 IOException{
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123 read(in,clientMode);
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124 }
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125
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126
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127 /**
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128 Initialises Message from the stream. Reads server response from
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129 given stream.
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130 @param in Input stream to read response from.
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131 @throws SocksException If server response code is not SOCKS_SUCCESS(0), or
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132 if any error with protocol occurs.
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133 @throws IOException If any error happens with I/O.
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134 */
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135 public void read(InputStream in) throws SocksException,
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136 IOException{
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137 read(in,true);
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138 }
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139
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140
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141 /**
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142 Initialises Message from the stream. Reads server response or client
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143 request from given stream.
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144
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145 @param in Input stream to read response from.
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146 @param clinetMode If true read server response, else read client request.
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147 @throws SocksException If server response code is not SOCKS_SUCCESS(0) and
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148 reading in client mode, or if any error with protocol occurs.
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149 @throws IOException If any error happens with I/O.
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150 */
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151 public void read(InputStream in,boolean clientMode) throws SocksException,
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152 IOException{
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153 data = null;
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154 ip = null;
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155
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156 DataInputStream di = new DataInputStream(in);
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157
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158 version = di.readUnsignedByte();
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159 command = di.readUnsignedByte();
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160 if(clientMode && command != 0)
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161 throw new SocksException(command);
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162
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163 int reserved = di.readUnsignedByte();
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164 addrType = di.readUnsignedByte();
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165
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166 byte addr[];
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167
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168 switch(addrType){
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169 case SOCKS_ATYP_IPV4:
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170 addr = new byte[4];
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171 di.readFully(addr);
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172 host = bytes2IPV4(addr,0);
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173 break;
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174 case SOCKS_ATYP_IPV6:
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175 addr = new byte[SOCKS_IPV6_LENGTH];//I believe it is 16 bytes,huge!
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176 di.readFully(addr);
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177 host = bytes2IPV6(addr,0);
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178 break;
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179 case SOCKS_ATYP_DOMAINNAME:
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180 //System.out.println("Reading ATYP_DOMAINNAME");
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181 addr = new byte[di.readUnsignedByte()];//Next byte shows the length
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182 di.readFully(addr);
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183 host = new String(addr);
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184 break;
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185 default:
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186 throw(new SocksException(CProxy.SOCKS_JUST_ERROR));
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187 }
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188
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189 port = di.readUnsignedShort();
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190
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191 if(addrType != SOCKS_ATYP_DOMAINNAME && doResolveIP){
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192 try{
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193 ip = InetAddress.getByName(host);
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194 }catch(UnknownHostException uh_ex){
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195 }
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196 }
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197 }
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198
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199 /**
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200 Writes the message to the stream.
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201 @param out Output stream to which message should be written.
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202 */
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203 public void write(OutputStream out)throws SocksException,
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204 IOException{
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205 if(data == null){
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206 Socks5Message msg;
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207
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208 if(addrType == SOCKS_ATYP_DOMAINNAME)
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209 msg = new Socks5Message(command,host,port);
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210 else{
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211 if(ip == null){
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212 try{
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213 ip = InetAddress.getByName(host);
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214 }catch(UnknownHostException uh_ex){
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215 throw new SocksException(CProxy.SOCKS_JUST_ERROR);
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216 }
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217 }
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218 msg = new Socks5Message(command,ip,port);
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219 }
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220 data = msg.data;
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221 }
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222 out.write(data);
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223 }
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224
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225 /**
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226 Returns IP field of the message as IP, if the message was created
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227 with ATYP of HOSTNAME, it will attempt to resolve the hostname,
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228 which might fail.
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229 @throws UnknownHostException if host can't be resolved.
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230 */
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231 public InetAddress getInetAddress() throws UnknownHostException{
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232 if(ip!=null) return ip;
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233
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234 return (ip=InetAddress.getByName(host));
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235 }
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236
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237 /**
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238 Returns string representation of the message.
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239 */
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240 public String toString(){
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241 String s=
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242 "Socks5Message:"+"\n"+
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243 "VN "+version+"\n"+
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244 "CMD "+command+"\n"+
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245 "ATYP "+addrType+"\n"+
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246 "ADDR "+host+"\n"+
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247 "PORT "+port+"\n";
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248 return s;
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249 }
352
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250
349
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251
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252 /**
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253 *Wether to resolve hostIP returned from SOCKS server
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254 *that is wether to create InetAddress object from the
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255 *hostName string
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256 */
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257 static public boolean resolveIP(){ return doResolveIP;}
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258
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259 /**
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260 *Wether to resolve hostIP returned from SOCKS server
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261 *that is wether to create InetAddress object from the
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262 *hostName string
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263 *@param doResolve Wether to resolve hostIP from SOCKS server.
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264 *@return Previous value.
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265 */
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266 static public boolean resolveIP(boolean doResolve){
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267 boolean old = doResolveIP;
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268 doResolveIP = doResolve;
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269 return old;
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270 }
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271
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272 /*
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273 private static final void debug(String s){
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274 if(DEBUG)
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275 System.out.print(s);
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276 }
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277 private static final boolean DEBUG = false;
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278 */
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279
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280 //SOCKS5 constants
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281 public static final int SOCKS_VERSION =5;
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282
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283 public static final int SOCKS_ATYP_IPV4 =0x1; //Where is 2??
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284 public static final int SOCKS_ATYP_DOMAINNAME =0x3; //!!!!rfc1928
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285 public static final int SOCKS_ATYP_IPV6 =0x4;
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286
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287 public static final int SOCKS_IPV6_LENGTH =16;
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288
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289 static boolean doResolveIP = true;
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290
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291 }