/*
    vpn.h -- header for vpn.C
    Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>
 
    This file is part of GVPE.

    GVPE 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 gvpe; if not, write to the Free Software
    Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/

#ifndef GVPE_VPN_H__
#define GVPE_VPN_H__

#include "global.h"
#include "conf.h"
#include "device.h"
#include "connection.h"

struct vpn
{
  int udpv4_fd , tcpv4_fd, ipv4_fd , icmpv4_fd , dnsv4_fd;
  int udpv4_tos,           ipv4_tos, icmpv4_tos, dnsv4_tos;

  int events;

  enum {
    EVENT_RECONNECT = 1,
    EVENT_SHUTDOWN  = 2,
  };

  void event_cb (ev::timer &w, int revents); ev::timer event;

  tap_device *tap;

  typedef vector<connection *> conns_vector;
  conns_vector conns;

  connection *find_router ();
  connection *find_forwarder ();

  void reconnect_all ();
  void shutdown_all ();

  void tap_ev (ev::io &w, int revents); ev::io tap_ev_watcher;
  void inject_data_packet (tap_packet *pkt, int dst);

  void send_connect_request (int id);

  void recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi);
  bool send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos = 0);

#if ENABLE_TCP
  void tcpv4_ev (ev::io &w, int revents); ev::io tcpv4_ev_watcher;
  bool send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos);
#endif

#if ENABLE_ICMP
  void icmpv4_ev (ev::io &w, int revents); ev::io icmpv4_ev_watcher;
  bool send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos);
#endif

#if ENABLE_DNS
  vector<struct dns_snd *> dns_sndpq;
  sockinfo dns_forwarder;

  void dnsv4_ev (ev::io &w, int revents); ev::io dnsv4_ev_watcher;
  void dnsv4_server (struct dns_packet &pkt);
  void dnsv4_client (struct dns_packet &pkt);

  bool send_dnsv4_packet (vpn_packet *pkt, const sockinfo &si, int tos);
#endif

  void udpv4_ev (ev::io &w, int revents); ev::io udpv4_ev_watcher;
  bool send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos);

  void ipv4_ev (ev::io &w, int revents); ev::io ipv4_ev_watcher;
  bool send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos);

  vpn ();
  ~vpn ();

  int setup ();

  void dump_status ();

  void script_init_env ();
  const char *script_if_init ();
  const char *script_if_up ();
};

extern vpn network; // THE vpn

#endif