/*
 *  anytun
 *
 *  The secure anycast tunneling protocol (satp) defines a protocol used
 *  for communication between any combination of unicast and anycast
 *  tunnel endpoints.  It has less protocol overhead than IPSec in Tunnel
 *  mode and allows tunneling of every ETHER TYPE protocol (e.g.
 *  ethernet, ip, arp ...). satp directly includes cryptography and
 *  message authentication based on the methods used by SRTP.  It is
 *  intended to deliver a generic, scaleable and secure solution for
 *  tunneling and relaying of packets of any protocol.
 *
 *
 *  Copyright (C) 2007-2014 Markus Grüneis, Othmar Gsenger, Erwin Nindl,
 *                          Christian Pointner <satp@wirdorange.org>
 *
 *  This file is part of Anytun.
 *
 *  Anytun 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
 *  any later version.
 *
 *  Anytun 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 Anytun.  If not, see <http://www.gnu.org/licenses/>.
 *
 *  In addition, as a special exception, the copyright holders give
 *  permission to link the code of portions of this program with the
 *  OpenSSL library under certain conditions as described in each
 *  individual source file, and distribute linked combinations
 *  including the two.
 *  You must obey the GNU General Public License in all respects
 *  for all of the code used other than OpenSSL.  If you modify
 *  file(s) with this exception, you may extend this exception to your
 *  version of the file(s), but you are not obligated to do so.  If you
 *  do not wish to do so, delete this exception statement from your
 *  version.  If you delete this exception statement from all source
 *  files in the program, then also delete it here.
 */

#include "threadUtils.hpp"
#include "datatypes.h"
#include "keyDerivationFactory.h"
#include "options.h"
#include "packetSource.h"

#include "connectionList.h"

ConnectionList& gConnectionList = ConnectionList::instance();

ConnectionList& ConnectionList::instance()
{
  static ConnectionList instance;
  return instance;
}

ConnectionList::ConnectionList()
{
}

ConnectionList::~ConnectionList()
{
  // TODO: comment this in as soon as threads @ main get cleaned up properly
  //  Lock lock(mutex_);
  // 	ConnectionMap::iterator it;
  // 	for(it = connections_.begin(); it != connections_.end(); ++it) {
  //     delete &it->second.kd_;
  //     delete &it->second.seq_window_;
  //   }
}

void ConnectionList::addConnection(ConnectionParam& conn, uint16_t mux)
{
  Lock lock(mutex_);

  std::pair<ConnectionMap::iterator, bool> ret = connections_.insert(ConnectionMap::value_type(mux, conn));
  if(!ret.second) {
    connections_.erase(ret.first);
    connections_.insert(ConnectionMap::value_type(mux, conn));
  }
}

const ConnectionMap::iterator ConnectionList::getEnd()
{
  Lock lock(mutex_);
  return connections_.end();
}

ConnectionMap::iterator ConnectionList::getBeginUnlocked()
{
  return connections_.begin();
}

const ConnectionMap::iterator ConnectionList::getBegin()
{
  Lock lock(mutex_);
  return connections_.begin();
}


ConnectionMap::iterator ConnectionList::getEndUnlocked()
{
  return connections_.end();
}

const ConnectionMap::iterator ConnectionList::getConnection(uint16_t mux)
{
  Lock lock(mutex_);
  ConnectionMap::iterator it = connections_.find(mux);
  return it;
}


ConnectionParam& ConnectionList::getOrNewConnectionUnlocked(uint16_t mux)
{
  ConnectionMap::iterator it = connections_.find(mux);
  if(it!=connections_.end()) {
    return it->second;
  }

  uint8_t key[] = {
    'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
    'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p'
  };

  uint8_t salt[] = {
    'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
    'i', 'j', 'k', 'l', 'm', 'n'
  };

  SeqWindow* seq= new SeqWindow(0);
  seq_nr_t seq_nr_=0;
  KeyDerivation* kd = KeyDerivationFactory::create(gOpt.getKdPrf());
  kd->init(Buffer(key, sizeof(key)), Buffer(salt, sizeof(salt)));
  ConnectionParam conn((*kd), (*seq), seq_nr_, PacketSourceEndpoint());
  connections_.insert(ConnectionMap::value_type(mux, conn));
  it = connections_.find(mux);
  return it->second;
}

void ConnectionList::clear()
{
  Lock lock(mutex_);
  connections_.clear();
}

bool ConnectionList::empty()
{
  Lock lock(mutex_);
  return connections_.empty();
}

Mutex& ConnectionList::getMutex()
{
  return mutex_;
}
