aria2/src/PeerListenCommand.cc

/* <!-- copyright */
/*
 * aria2 - a simple utility for downloading files faster
 *
 * Copyright (C) 2006 Tatsuhiro Tsujikawa
 *
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
/* copyright --> */
#include "PeerListenCommand.h"
#include "PeerInteractionCommand.h"

PeerListenCommand::PeerListenCommand(int cuid, TorrentDownloadEngine* e)
  :Command(cuid), e(e), socket(NULL) {}

PeerListenCommand::~PeerListenCommand() {
  if(socket != NULL) {
    delete socket;
  }
}

int PeerListenCommand::bindPort(int portRangeStart, int portRangeEnd) {
  if(portRangeStart > portRangeEnd) {
    return -1;
  }
  for(int port = portRangeStart; port <= portRangeEnd; port++) {
    try {
      socket = new Socket();
      socket->beginListen(port);
      logger->info("CUID#%d - using port %d for accepting new connections",
		   cuid, port);
      return port;
    } catch(Exception* ex) {
      logger->error("CUID#%d - an error occurred while binding port=%d",
		    ex, cuid, port);
      delete ex;
      delete socket;
      socket = NULL;
    }
  }
  return -1;
}

bool PeerListenCommand::execute() {
  if(e->torrentMan->isHalt()) {
    return true;
  }
  try {
    for(int i = 0; i < 3 && socket->isReadable(0); i++) {
      Socket* peerSocket = NULL;
      try {
	peerSocket = socket->acceptConnection();
	pair<string, int> peerInfo;
	peerSocket->getPeerInfo(peerInfo);
	pair<string, int> localInfo;
	peerSocket->getAddrInfo(localInfo);
	if(peerInfo.first != localInfo.first &&
	   e->torrentMan->connections < MAX_PEERS) {
	  Peer* peer = new Peer(peerInfo.first, peerInfo.second,
				e->torrentMan->pieceLength,
				e->torrentMan->getTotalLength());
	  if(e->torrentMan->addPeer(peer, true)) {
	    int newCuid =  e->torrentMan->getNewCuid();
	    peer->cuid = newCuid;
	    PeerInteractionCommand* command =
	      new PeerInteractionCommand(newCuid, peer, e, peerSocket,
					 PeerInteractionCommand::RECEIVER_WAIT_HANDSHAKE);
	    e->commands.push_back(command);
	    logger->debug("CUID#%d - incoming connection, adding new command CUID#%d", cuid, newCuid);
	  } else {
	    delete peer;
	  }
	}
	delete peerSocket;
      } catch(Exception* ex) {
	logger->error("CUID#%d - error in accepting connection", ex, cuid);
	delete ex;
	if(peerSocket != NULL) {
	  delete peerSocket;
	}
      }		    
    }
  } catch(Exception* e) {
    logger->error("CUID#%d - Exception occurred.", e, cuid);
    delete e;
  }
  e->commands.push_back(this);
  return false;
}