sockspacket.java

SOCK VIA HTTP是通过HTTP建立通道的SOCK

/*
This file is part of Socks via HTTP.

This package is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

Socks via HTTP is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Socks via HTTP; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

// Title :        SocksPacket.java
// Version :      0.40
// Copyright :    Copyright (c) 2001
// Author :       Florent CUETO ([e-mail])
// Description :  Class containing the data of a socks packet

package socks4;

public class SocksPacket
{
  public static final int SOCKS4_REPLY_VERSION = 0; // Must be 0
  public static final int SOCKS4_OK = 90; // request granted
  public static final int SOCKS4_KO = 91; // request rejected or failed
  public static final int SOCKS4_IDENTD_KO = 92; // request rejected because SOCKS server cannot connect to identd on the client
  public static final int SOCKS4_USERID_KO = 93; // request rejected because the client program and identd report different user-ids

  public int version;
  public int command;
  public int destPort;
  public String destIP;
  public String userId;
  public String dnsName = null;

  public SocksPacket()
  {
    super();
  }

  public SocksPacket(byte[] tab)
  {
    version = b2i(tab[0]);
    command = b2i(tab[1]);
    destPort = 256 * b2i(tab[2]) + b2i(tab[3]);
    if ((tab[4] == 0) && (tab[5] == 0) && (tab[6] == 0))
    {
      // SOCKS 4A
      destIP = "0.0.0." + b2i(tab[7]);
      int pos = -1;
      for (int i = 8; i < tab.length; i++)
      {
        if (tab[i] == 0) pos = i;
      }
      userId = new String(tab, 8, pos - 8);
      dnsName = new String(tab, pos + 1, tab.length - pos - 2);
    }
    else
    {
      // SOCKS 4
      destIP = "" + b2i(tab[4]) + "." + b2i(tab[5]) + "." + b2i(tab[6]) + "." + b2i(tab[7]);
      userId = new String(tab, 8, tab.length - 8 - 1);
      dnsName = null;
    }
    /*Log.printLog("RECEIVED");
    Log.printLog(toString());*/
  }

  public byte[] toBytes()
  {
    String[] bytes = ServletSocks.stringSplit(destIP, ".", false);
    byte[] ret = new byte[8];
    ret[0] = (byte)version;
    ret[1] = (byte)command;
    ret[2] = i2b(destPort / 256);
    ret[3] = i2b(destPort % 256);
    ret[4] = i2b(Integer.parseInt(bytes[0]));
    ret[5] = i2b(Integer.parseInt(bytes[1]));
    ret[6] = i2b(Integer.parseInt(bytes[2]));
    ret[7] = i2b(Integer.parseInt(bytes[3]));

    //for (int i = 0; i < 8; i++) Log.printLog("" + i + " : " + ret[i]);

    return(ret);
  }

  public String toString()
  {
    String ret = "SocksPacket\n";
    ret += "version : " + version + "\n";
    ret += "command : " + command + "\n";
    ret += "destPort : " + destPort + "\n";
    ret += "destIP : " + destIP + "\n";
    ret += "userId : " + userId + "\n";
    ret += "dnsName : " + dnsName + "\n";
    return(ret);
  }

  public int b2i(byte b)
  {
    return (b < 0 ? 256 + b : b);
  }

  public byte i2b(int i)
  {
    return (i > 127 ? (byte)(i - 256) : (byte)i);
  }
}