CmdPORT.java :  » UnTagged » swiftp » org » swiftp » Android Open Source

/*
Copyright 2009 David Revell

This file is part of SwiFTP.

SwiFTP 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 3 of the License, or
(at your option) any later version.

SwiFTP 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 SwiFTP.  If not, see <http://www.gnu.org/licenses/>.
*/

package org.swiftp;

import java.net.InetAddress;
import java.net.UnknownHostException;

import android.util.Log;

public class CmdPORT extends FtpCmd implements Runnable {
  //public static final String message = "TEMPLATE!!";
  String input;
  
  public CmdPORT(SessionThread sessionThread, String input) {
    super(sessionThread, CmdPORT.class.toString());
    this.input = input;
  }
  
  public void run() {
    myLog.l(Log.DEBUG, "PORT running");
    String errString = null;
    mainBlock: {
      String param = getParameter(input);
      if(param.contains("|") && param.contains("::")) {
        errString = "550 No IPv6 support, reconfigure your client\r\n";
        break mainBlock;
      }
      String[] substrs = param.split(",");
      if(substrs.length != 6) {
        errString = "550 Malformed PORT argument\r\n";
        break mainBlock;
      }
      for(int i=0; i<substrs.length; i++) {
        // Check that each IP/port octet is numeric and not too long
        if(!substrs[i].matches("[0-9]+") || 
            substrs[i].length() > 3) 
        {
          errString = "550 Invalid PORT argument: " + substrs[i] + 
                "\r\n";
          break mainBlock;
        }
      }
      byte[] ipBytes = new byte[4];
      for(int i=0; i<4; i++) {
        try {
          // We have to manually convert unsigned to signed
          // byte representation.
          int ipByteAsInt = Integer.parseInt(substrs[i]);
          if(ipByteAsInt >= 128) {
            ipByteAsInt -= 256;
          }
          ipBytes[i] = (byte)ipByteAsInt;
        } catch (Exception e) {
          errString = "550 Invalid PORT format: " 
            + substrs[i] + "\r\n";
          break mainBlock;
        }
      }
      InetAddress inetAddr;
      try {
        inetAddr = InetAddress.getByAddress(ipBytes);
      } catch (UnknownHostException e) {
        errString = "550 Unknown host\r\n";
        break mainBlock;
      }
      
      int port = Integer.parseInt(substrs[4]) * 256 + 
                 Integer.parseInt(substrs[5]);
      
      sessionThread.onPort(inetAddr, port);
    }
    if(errString == null) {
      sessionThread.writeString("200 PORT OK\r\n");
      myLog.l(Log.DEBUG, "PORT completed");
    } else {
      myLog.l(Log.INFO, "PORT error: " + errString);
      sessionThread.writeString(errString);
    }
  }
}