package net.sourceforge.jsocks.socks;
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;
}