mirror of
https://codeberg.org/Mercury-IM/Smack
synced 2024-11-19 21:12:05 +01:00
359 lines
11 KiB
Java
359 lines
11 KiB
Java
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package org.jivesoftware.smack.proxy;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.net.InetAddress;
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import java.net.Socket;
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import java.net.UnknownHostException;
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import javax.net.SocketFactory;
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/**
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* Socket factory for Socks5 proxy
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*
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* @author Atul Aggarwal
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*/
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public class Socks5ProxySocketFactory
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extends SocketFactory
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{
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private ProxyInfo proxy;
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public Socks5ProxySocketFactory(ProxyInfo proxy)
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{
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this.proxy = proxy;
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}
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public Socket createSocket(String host, int port)
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throws IOException, UnknownHostException
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{
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return socks5ProxifiedSocket(host,port);
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}
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public Socket createSocket(String host ,int port, InetAddress localHost,
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int localPort)
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throws IOException, UnknownHostException
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{
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return socks5ProxifiedSocket(host,port);
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}
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public Socket createSocket(InetAddress host, int port)
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throws IOException
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{
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return socks5ProxifiedSocket(host.getHostAddress(),port);
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}
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public Socket createSocket( InetAddress address, int port,
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InetAddress localAddress, int localPort)
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throws IOException
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{
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return socks5ProxifiedSocket(address.getHostAddress(),port);
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}
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private Socket socks5ProxifiedSocket(String host, int port)
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throws IOException
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{
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Socket socket = null;
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InputStream in = null;
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OutputStream out = null;
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String proxy_host = proxy.getProxyAddress();
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int proxy_port = proxy.getProxyPort();
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String user = proxy.getProxyUsername();
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String passwd = proxy.getProxyPassword();
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try
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{
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socket=new Socket(proxy_host, proxy_port);
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in=socket.getInputStream();
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out=socket.getOutputStream();
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socket.setTcpNoDelay(true);
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byte[] buf=new byte[1024];
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int index=0;
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/*
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+----+----------+----------+
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|VER | NMETHODS | METHODS |
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+----+----------+----------+
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| 1 | 1 | 1 to 255 |
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+----+----------+----------+
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The VER field is set to X'05' for this version of the protocol. The
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NMETHODS field contains the number of method identifier octets that
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appear in the METHODS field.
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The values currently defined for METHOD are:
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o X'00' NO AUTHENTICATION REQUIRED
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o X'01' GSSAPI
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o X'02' USERNAME/PASSWORD
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o X'03' to X'7F' IANA ASSIGNED
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o X'80' to X'FE' RESERVED FOR PRIVATE METHODS
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o X'FF' NO ACCEPTABLE METHODS
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*/
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buf[index++]=5;
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buf[index++]=2;
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buf[index++]=0; // NO AUTHENTICATION REQUIRED
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buf[index++]=2; // USERNAME/PASSWORD
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out.write(buf, 0, index);
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/*
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The server selects from one of the methods given in METHODS, and
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sends a METHOD selection message:
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+----+--------+
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|VER | METHOD |
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+----+--------+
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| 1 | 1 |
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+----+--------+
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*/
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//in.read(buf, 0, 2);
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fill(in, buf, 2);
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boolean check=false;
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switch((buf[1])&0xff)
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{
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case 0: // NO AUTHENTICATION REQUIRED
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check=true;
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break;
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case 2: // USERNAME/PASSWORD
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if(user==null || passwd==null)
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{
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break;
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}
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/*
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Once the SOCKS V5 server has started, and the client has selected the
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Username/Password Authentication protocol, the Username/Password
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subnegotiation begins. This begins with the client producing a
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Username/Password request:
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+----+------+----------+------+----------+
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|VER | ULEN | UNAME | PLEN | PASSWD |
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+----+------+----------+------+----------+
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| 1 | 1 | 1 to 255 | 1 | 1 to 255 |
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+----+------+----------+------+----------+
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The VER field contains the current version of the subnegotiation,
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which is X'01'. The ULEN field contains the length of the UNAME field
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that follows. The UNAME field contains the username as known to the
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source operating system. The PLEN field contains the length of the
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PASSWD field that follows. The PASSWD field contains the password
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association with the given UNAME.
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*/
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index=0;
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buf[index++]=1;
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buf[index++]=(byte)(user.length());
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System.arraycopy(user.getBytes(), 0, buf, index,
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user.length());
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index+=user.length();
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buf[index++]=(byte)(passwd.length());
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System.arraycopy(passwd.getBytes(), 0, buf, index,
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passwd.length());
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index+=passwd.length();
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out.write(buf, 0, index);
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/*
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The server verifies the supplied UNAME and PASSWD, and sends the
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following response:
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+----+--------+
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|VER | STATUS |
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+----+--------+
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| 1 | 1 |
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+----+--------+
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A STATUS field of X'00' indicates success. If the server returns a
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`failure' (STATUS value other than X'00') status, it MUST close the
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connection.
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*/
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//in.read(buf, 0, 2);
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fill(in, buf, 2);
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if(buf[1]==0)
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{
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check=true;
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}
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break;
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default:
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}
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if(!check)
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{
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try
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{
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socket.close();
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}
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catch(Exception eee)
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{
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}
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throw new ProxyException(ProxyInfo.ProxyType.SOCKS5,
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"fail in SOCKS5 proxy");
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}
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/*
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The SOCKS request is formed as follows:
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+----+-----+-------+------+----------+----------+
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|VER | CMD | RSV | ATYP | DST.ADDR | DST.PORT |
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+----+-----+-------+------+----------+----------+
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| 1 | 1 | X'00' | 1 | Variable | 2 |
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+----+-----+-------+------+----------+----------+
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Where:
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o VER protocol version: X'05'
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o CMD
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o CONNECT X'01'
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o BIND X'02'
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o UDP ASSOCIATE X'03'
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o RSV RESERVED
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o ATYP address type of following address
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o IP V4 address: X'01'
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o DOMAINNAME: X'03'
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o IP V6 address: X'04'
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o DST.ADDR desired destination address
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o DST.PORT desired destination port in network octet
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order
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*/
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index=0;
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buf[index++]=5;
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buf[index++]=1; // CONNECT
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buf[index++]=0;
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byte[] hostb=host.getBytes();
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int len=hostb.length;
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buf[index++]=3; // DOMAINNAME
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buf[index++]=(byte)(len);
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System.arraycopy(hostb, 0, buf, index, len);
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index+=len;
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buf[index++]=(byte)(port>>>8);
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buf[index++]=(byte)(port&0xff);
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out.write(buf, 0, index);
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/*
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The SOCKS request information is sent by the client as soon as it has
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established a connection to the SOCKS server, and completed the
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authentication negotiations. The server evaluates the request, and
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returns a reply formed as follows:
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+----+-----+-------+------+----------+----------+
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|VER | REP | RSV | ATYP | BND.ADDR | BND.PORT |
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+----+-----+-------+------+----------+----------+
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| 1 | 1 | X'00' | 1 | Variable | 2 |
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+----+-----+-------+------+----------+----------+
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Where:
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o VER protocol version: X'05'
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o REP Reply field:
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o X'00' succeeded
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o X'01' general SOCKS server failure
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o X'02' connection not allowed by ruleset
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o X'03' Network unreachable
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o X'04' Host unreachable
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o X'05' Connection refused
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o X'06' TTL expired
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o X'07' Command not supported
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o X'08' Address type not supported
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o X'09' to X'FF' unassigned
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o RSV RESERVED
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o ATYP address type of following address
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o IP V4 address: X'01'
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o DOMAINNAME: X'03'
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o IP V6 address: X'04'
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o BND.ADDR server bound address
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o BND.PORT server bound port in network octet order
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*/
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//in.read(buf, 0, 4);
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fill(in, buf, 4);
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if(buf[1]!=0)
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{
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try
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{
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socket.close();
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}
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catch(Exception eee)
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{
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}
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throw new ProxyException(ProxyInfo.ProxyType.SOCKS5,
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"server returns "+buf[1]);
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}
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switch(buf[3]&0xff)
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{
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case 1:
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//in.read(buf, 0, 6);
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fill(in, buf, 6);
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break;
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case 3:
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//in.read(buf, 0, 1);
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fill(in, buf, 1);
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//in.read(buf, 0, buf[0]+2);
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fill(in, buf, (buf[0]&0xff)+2);
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break;
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case 4:
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//in.read(buf, 0, 18);
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fill(in, buf, 18);
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break;
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default:
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}
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return socket;
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}
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catch(RuntimeException e)
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{
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throw e;
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}
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catch(Exception e)
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{
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try
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{
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if(socket!=null)
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{
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socket.close();
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}
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}
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catch(Exception eee)
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{
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}
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String message="ProxySOCKS5: "+e.toString();
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if(e instanceof Throwable)
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{
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throw new ProxyException(ProxyInfo.ProxyType.SOCKS5,message,
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(Throwable)e);
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}
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throw new IOException(message);
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}
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}
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private void fill(InputStream in, byte[] buf, int len)
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throws IOException
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{
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int s=0;
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while(s<len)
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{
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int i=in.read(buf, s, len-s);
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if(i<=0)
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{
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throw new ProxyException(ProxyInfo.ProxyType.SOCKS5, "stream " +
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"is closed");
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}
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s+=i;
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}
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}
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}
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