Shuyi Chen | d7955ce | 2013-05-22 14:51:55 -0700 | [diff] [blame] | 1 | /** |
| 2 | * $RCSfile$ |
| 3 | * $Revision$ |
| 4 | * $Date$ |
| 5 | * |
| 6 | * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License"); |
| 7 | * you may not use this file except in compliance with the License. |
| 8 | * You may obtain a copy of the License at |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, software |
| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 15 | * See the License for the specific language governing permissions and |
| 16 | * limitations under the License. |
| 17 | */ |
| 18 | package org.jivesoftware.smack.proxy; |
| 19 | |
| 20 | import java.io.IOException; |
| 21 | import java.io.InputStream; |
| 22 | import java.io.OutputStream; |
| 23 | import java.net.InetAddress; |
| 24 | import java.net.Socket; |
| 25 | import java.net.UnknownHostException; |
| 26 | import javax.net.SocketFactory; |
| 27 | |
| 28 | /** |
| 29 | * Socket factory for socks4 proxy |
| 30 | * |
| 31 | * @author Atul Aggarwal |
| 32 | */ |
| 33 | public class Socks4ProxySocketFactory |
| 34 | extends SocketFactory |
| 35 | { |
| 36 | private ProxyInfo proxy; |
| 37 | |
| 38 | public Socks4ProxySocketFactory(ProxyInfo proxy) |
| 39 | { |
| 40 | this.proxy = proxy; |
| 41 | } |
| 42 | |
| 43 | public Socket createSocket(String host, int port) |
| 44 | throws IOException, UnknownHostException |
| 45 | { |
| 46 | return socks4ProxifiedSocket(host,port); |
| 47 | |
| 48 | } |
| 49 | |
| 50 | public Socket createSocket(String host ,int port, InetAddress localHost, |
| 51 | int localPort) |
| 52 | throws IOException, UnknownHostException |
| 53 | { |
| 54 | return socks4ProxifiedSocket(host,port); |
| 55 | } |
| 56 | |
| 57 | public Socket createSocket(InetAddress host, int port) |
| 58 | throws IOException |
| 59 | { |
| 60 | return socks4ProxifiedSocket(host.getHostAddress(),port); |
| 61 | } |
| 62 | |
| 63 | public Socket createSocket( InetAddress address, int port, |
| 64 | InetAddress localAddress, int localPort) |
| 65 | throws IOException |
| 66 | { |
| 67 | return socks4ProxifiedSocket(address.getHostAddress(),port); |
| 68 | |
| 69 | } |
| 70 | |
| 71 | private Socket socks4ProxifiedSocket(String host, int port) |
| 72 | throws IOException |
| 73 | { |
| 74 | Socket socket = null; |
| 75 | InputStream in = null; |
| 76 | OutputStream out = null; |
| 77 | String proxy_host = proxy.getProxyAddress(); |
| 78 | int proxy_port = proxy.getProxyPort(); |
| 79 | String user = proxy.getProxyUsername(); |
| 80 | String passwd = proxy.getProxyPassword(); |
| 81 | |
| 82 | try |
| 83 | { |
| 84 | socket=new Socket(proxy_host, proxy_port); |
| 85 | in=socket.getInputStream(); |
| 86 | out=socket.getOutputStream(); |
| 87 | socket.setTcpNoDelay(true); |
| 88 | |
| 89 | byte[] buf=new byte[1024]; |
| 90 | int index=0; |
| 91 | |
| 92 | /* |
| 93 | 1) CONNECT |
| 94 | |
| 95 | The client connects to the SOCKS server and sends a CONNECT request when |
| 96 | it wants to establish a connection to an application server. The client |
| 97 | includes in the request packet the IP address and the port number of the |
| 98 | destination host, and userid, in the following format. |
| 99 | |
| 100 | +----+----+----+----+----+----+----+----+----+----+....+----+ |
| 101 | | VN | CD | DSTPORT | DSTIP | USERID |NULL| |
| 102 | +----+----+----+----+----+----+----+----+----+----+....+----+ |
| 103 | # of bytes: 1 1 2 4 variable 1 |
| 104 | |
| 105 | VN is the SOCKS protocol version number and should be 4. CD is the |
| 106 | SOCKS command code and should be 1 for CONNECT request. NULL is a byte |
| 107 | of all zero bits. |
| 108 | */ |
| 109 | |
| 110 | index=0; |
| 111 | buf[index++]=4; |
| 112 | buf[index++]=1; |
| 113 | |
| 114 | buf[index++]=(byte)(port>>>8); |
| 115 | buf[index++]=(byte)(port&0xff); |
| 116 | |
| 117 | try |
| 118 | { |
| 119 | InetAddress addr=InetAddress.getByName(host); |
| 120 | byte[] byteAddress = addr.getAddress(); |
| 121 | for (int i = 0; i < byteAddress.length; i++) |
| 122 | { |
| 123 | buf[index++]=byteAddress[i]; |
| 124 | } |
| 125 | } |
| 126 | catch(UnknownHostException uhe) |
| 127 | { |
| 128 | throw new ProxyException(ProxyInfo.ProxyType.SOCKS4, |
| 129 | uhe.toString(), uhe); |
| 130 | } |
| 131 | |
| 132 | if(user!=null) |
| 133 | { |
| 134 | System.arraycopy(user.getBytes(), 0, buf, index, user.length()); |
| 135 | index+=user.length(); |
| 136 | } |
| 137 | buf[index++]=0; |
| 138 | out.write(buf, 0, index); |
| 139 | |
| 140 | /* |
| 141 | The SOCKS server checks to see whether such a request should be granted |
| 142 | based on any combination of source IP address, destination IP address, |
| 143 | destination port number, the userid, and information it may obtain by |
| 144 | consulting IDENT, cf. RFC 1413. If the request is granted, the SOCKS |
| 145 | server makes a connection to the specified port of the destination host. |
| 146 | A reply packet is sent to the client when this connection is established, |
| 147 | or when the request is rejected or the operation fails. |
| 148 | |
| 149 | +----+----+----+----+----+----+----+----+ |
| 150 | | VN | CD | DSTPORT | DSTIP | |
| 151 | +----+----+----+----+----+----+----+----+ |
| 152 | # of bytes: 1 1 2 4 |
| 153 | |
| 154 | VN is the version of the reply code and should be 0. CD is the result |
| 155 | code with one of the following values: |
| 156 | |
| 157 | 90: request granted |
| 158 | 91: request rejected or failed |
| 159 | 92: request rejected becasue SOCKS server cannot connect to |
| 160 | identd on the client |
| 161 | 93: request rejected because the client program and identd |
| 162 | report different user-ids |
| 163 | |
| 164 | The remaining fields are ignored. |
| 165 | */ |
| 166 | |
| 167 | int len=6; |
| 168 | int s=0; |
| 169 | while(s<len) |
| 170 | { |
| 171 | int i=in.read(buf, s, len-s); |
| 172 | if(i<=0) |
| 173 | { |
| 174 | throw new ProxyException(ProxyInfo.ProxyType.SOCKS4, |
| 175 | "stream is closed"); |
| 176 | } |
| 177 | s+=i; |
| 178 | } |
| 179 | if(buf[0]!=0) |
| 180 | { |
| 181 | throw new ProxyException(ProxyInfo.ProxyType.SOCKS4, |
| 182 | "server returns VN "+buf[0]); |
| 183 | } |
| 184 | if(buf[1]!=90) |
| 185 | { |
| 186 | try |
| 187 | { |
| 188 | socket.close(); |
| 189 | } |
| 190 | catch(Exception eee) |
| 191 | { |
| 192 | } |
| 193 | String message="ProxySOCKS4: server returns CD "+buf[1]; |
| 194 | throw new ProxyException(ProxyInfo.ProxyType.SOCKS4,message); |
| 195 | } |
| 196 | byte[] temp = new byte[2]; |
| 197 | in.read(temp, 0, 2); |
| 198 | return socket; |
| 199 | } |
| 200 | catch(RuntimeException e) |
| 201 | { |
| 202 | throw e; |
| 203 | } |
| 204 | catch(Exception e) |
| 205 | { |
| 206 | try |
| 207 | { |
| 208 | if(socket!=null)socket.close(); |
| 209 | } |
| 210 | catch(Exception eee) |
| 211 | { |
| 212 | } |
| 213 | throw new ProxyException(ProxyInfo.ProxyType.SOCKS4, e.toString()); |
| 214 | } |
| 215 | } |
| 216 | } |