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The source code is released under:
GNU Lesser General Public License
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package net.sourceforge.jsocks.socks; //from w ww . ja va 2 s . c om import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.DataInputStream; import java.net.InetAddress; import java.net.UnknownHostException; /** SOCKS5 request/response message. */ class Socks5Message extends ProxyMessage{ /** Address type of given message*/ public int addrType; byte[] data; /** Server error response. @param cmd Error code. */ public Socks5Message(int cmd){ super(cmd,null,0); data = new byte[3]; data[0] = SOCKS_VERSION; //Version. data[1] = (byte)cmd; //Reply code for some kind of failure. data[2] = 0; //Reserved byte. } /** Construct client request or server response. @param cmd - Request/Response code. @param ip - IP field. @paarm port - port field. */ public Socks5Message(int cmd,InetAddress ip,int port){ super(cmd,ip,port); this.host = ip==null?"0.0.0.0":ip.getHostName(); this.version = SOCKS_VERSION; byte[] addr; if(ip == null){ addr = new byte[4]; addr[0]=addr[1]=addr[2]=addr[3]=0; }else addr = ip.getAddress(); addrType = addr.length == 4 ? SOCKS_ATYP_IPV4 : SOCKS_ATYP_IPV6; data = new byte[6+addr.length]; data[0] = (byte) SOCKS_VERSION; //Version data[1] = (byte) command; //Command data[2] = (byte) 0; //Reserved byte data[3] = (byte) addrType; //Address type //Put Address System.arraycopy(addr,0,data,4,addr.length); //Put port data[data.length-2] = (byte)(port>>8); data[data.length-1] = (byte)(port); } /** Construct client request or server response. @param cmd - Request/Response code. @param hostName - IP field as hostName, uses ADDR_TYPE of HOSTNAME. @paarm port - port field. */ public Socks5Message(int cmd,String hostName,int port){ super(cmd,null,port); this.host = hostName; this.version = SOCKS_VERSION; //System.out.println("Doing ATYP_DOMAINNAME"); addrType = SOCKS_ATYP_DOMAINNAME; byte addr[] = hostName.getBytes(); data =new byte[7+addr.length]; data[0] = (byte) SOCKS_VERSION; //Version data[1] = (byte) command; //Command data[2] = (byte) 0; //Reserved byte data[3] = (byte) SOCKS_ATYP_DOMAINNAME; //Address type data[4] = (byte) addr.length; //Length of the address //Put Address System.arraycopy(addr,0,data,5,addr.length); //Put port data[data.length-2] = (byte)(port >>8); data[data.length-1] = (byte)(port); } /** Initialises Message from the stream. Reads server response from given stream. @param in Input stream to read response from. @throws SocksException If server response code is not SOCKS_SUCCESS(0), or if any error with protocol occurs. @throws IOException If any error happens with I/O. */ public Socks5Message(InputStream in) throws SocksException, IOException{ this(in,true); } /** Initializes Message from the stream. Reads server response or client request from given stream. @param in Input stream to read response from. @param clientMode If true read server response, else read client request. @throws SocksException If server response code is not SOCKS_SUCCESS(0) and reading in client mode, or if any error with protocol occurs. @throws IOException If any error happens with I/O. */ public Socks5Message(InputStream in,boolean clientMode)throws SocksException, IOException{ read(in,clientMode); } /** Initialises Message from the stream. Reads server response from given stream. @param in Input stream to read response from. @throws SocksException If server response code is not SOCKS_SUCCESS(0), or if any error with protocol occurs. @throws IOException If any error happens with I/O. */ public void read(InputStream in) throws SocksException, IOException{ read(in,true); } /** Initializes Message from the stream. Reads server response or client request from given stream. @param in Input stream to read response from. @param clientMode If true read server response, else read client request. @throws SocksException If server response code is not SOCKS_SUCCESS(0) and reading in client mode, or if any error with protocol occurs. @throws IOException If any error happens with I/O. */ @Override public void read(InputStream in,boolean clientMode) throws SocksException, IOException{ data = null; ip = null; DataInputStream di = new DataInputStream(in); version = di.readUnsignedByte(); command = di.readUnsignedByte(); if(clientMode && command != 0) throw new SocksException(command); int reserved = di.readUnsignedByte(); addrType = di.readUnsignedByte(); byte addr[]; switch(addrType){ case SOCKS_ATYP_IPV4: addr = new byte[4]; di.readFully(addr); host = bytes2IPV4(addr,0); break; case SOCKS_ATYP_IPV6: addr = new byte[SOCKS_IPV6_LENGTH];//I believe it is 16 bytes,huge! di.readFully(addr); host = bytes2IPV6(addr,0); break; case SOCKS_ATYP_DOMAINNAME: //System.out.println("Reading ATYP_DOMAINNAME"); addr = new byte[di.readUnsignedByte()];//Next byte shows the length di.readFully(addr); host = new String(addr); break; default: throw(new SocksException(Proxy.SOCKS_JUST_ERROR)); } port = di.readUnsignedShort(); if(addrType != SOCKS_ATYP_DOMAINNAME && doResolveIP){ try{ ip = InetAddress.getByName(host); }catch(UnknownHostException uh_ex){ } } } /** Writes the message to the stream. @param out Output stream to which message should be written. */ public void write(OutputStream out)throws SocksException, IOException{ if(data == null){ Socks5Message msg; if(addrType == SOCKS_ATYP_DOMAINNAME) msg = new Socks5Message(command,host,port); else{ if(ip == null){ try{ ip = InetAddress.getByName(host); }catch(UnknownHostException uh_ex){ throw new SocksException(Proxy.SOCKS_JUST_ERROR); } } msg = new Socks5Message(command,ip,port); } data = msg.data; } out.write(data); } /** Returns IP field of the message as IP, if the message was created with ATYP of HOSTNAME, it will attempt to resolve the hostname, which might fail. @throws UnknownHostException if host can't be resolved. */ public InetAddress getInetAddress() throws UnknownHostException{ if(ip!=null) return ip; return (ip=InetAddress.getByName(host)); } /** Returns string representation of the message. */ public String toString(){ String s= "Socks5Message:"+"\n"+ "VN "+version+"\n"+ "CMD "+command+"\n"+ "ATYP "+addrType+"\n"+ "ADDR "+host+"\n"+ "PORT "+port+"\n"; return s; } /** *Wether to resolve hostIP returned from SOCKS server *that is wether to create InetAddress object from the *hostName string */ static public boolean resolveIP(){ return doResolveIP;} /** *Wether to resolve hostIP returned from SOCKS server *that is wether to create InetAddress object from the *hostName string *@param doResolve Wether to resolve hostIP from SOCKS server. *@return Previous value. */ static public boolean resolveIP(boolean doResolve){ boolean old = doResolveIP; doResolveIP = doResolve; return old; } /* private static final void debug(String s){ if(DEBUG) System.out.print(s); } private static final boolean DEBUG = false; */ //SOCKS5 constants public static final int SOCKS_VERSION =5; public static final int SOCKS_ATYP_IPV4 =0x1; //Where is 2?? public static final int SOCKS_ATYP_DOMAINNAME =0x3; //!!!!rfc1928 public static final int SOCKS_ATYP_IPV6 =0x4; public static final int SOCKS_IPV6_LENGTH =16; static boolean doResolveIP = true; }