/*
 * ClientConnection.cpp
 *
 * Copyright (C) 2008 Matthias Schiffer <matthias@gamezock.de>
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#include "ClientConnection.h"
#include "IPAddress.h"
#include <cstring>
#include <cerrno>
#include <sys/socket.h>

namespace Mad {
namespace Net {

void ClientConnection::connect(const IPAddress &address) throw(ConnectionException) {
  const int kx_list[] = {GNUTLS_KX_ANON_DH, 0};
  
  if(connected)
    disconnect();
  
  peer = new IPAddress(address);
  
  sock = socket(PF_INET, SOCK_STREAM, 0);
  if(sock < 0)
    throw ConnectionException("socket()", std::strerror(errno));
  
  if(::connect(sock, peer->getSockAddr(), peer->getSockAddrLength()) < 0)
    throw ConnectionException("connect()", std::strerror(errno));
  
  gnutls_anon_allocate_client_credentials(&anoncred);
  gnutls_init(&session, GNUTLS_CLIENT);
  
  gnutls_set_default_priority(session);
  gnutls_kx_set_priority(session, kx_list);
  
  gnutls_credentials_set(session, GNUTLS_CRD_ANON, anoncred);
  
  gnutls_transport_set_ptr(session, reinterpret_cast<gnutls_transport_ptr_t>(sock));
  
  int ret = gnutls_handshake(session);
  if(ret < 0)
    throw ConnectionException("gnutls_handshake()", gnutls_strerror(ret));
  
  connected = true;
}

void ClientConnection::disconnect() {
  if(!connected)
    return;
  
  gnutls_bye(session, GNUTLS_SHUT_RDWR);
  
  if(sock >= 0) {
    shutdown(sock, SHUT_RDWR);
    close(sock);
    sock = -1;
  }
  
  gnutls_deinit(session);
  gnutls_anon_free_client_credentials(anoncred);
  
  if(peer) {
    delete peer;
    peer = 0;
  }
  
  connected = false;
}

}
}