/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  m_pong.c: The reply to a ping message.
 *
 *  Copyright (C) 2002 by the past and present ircd coders, and others.
 *
 *  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
 *
 *  $Id: m_pong.c 503 2006-03-03 19:53:47Z michael $
 */

#include "stdinc.h"
#include "ircd.h"
#include "handlers.h"
#include "s_user.h"
#include "client.h"
#include "hash.h"       /* for find_client() */
#include "numeric.h"
#include "s_conf.h"
#include "send.h"
#include "irc_string.h"
#include "msg.h"
#include "parse.h"
#include "modules.h"

static void mr_pong(struct Client *, struct Client *, int, char **);
static void ms_pong(struct Client *, struct Client *, int, char **);

struct Message pong_msgtab = {
  "PONG", 0, 0, 1, 0, MFLG_SLOW | MFLG_UNREG, 0,
  {mr_pong, m_ignore, ms_pong, m_ignore, m_ignore, m_ignore}
};

#ifndef STATIC_MODULES
void
_modinit(void)
{
  mod_add_cmd(&pong_msgtab);
}

void
_moddeinit(void)
{
  mod_del_cmd(&pong_msgtab);
}

const char *_version = "$Revision: 503 $";
#endif

static void
ms_pong(struct Client *client_p, struct Client *source_p,
        int parc, char *parv[])
{
  struct Client *target_p;
  const char *origin, *destination;

  if (parc < 2 || *parv[1] == '\0')
  {
    sendto_one(source_p, form_str(ERR_NOORIGIN),
               me.name, parv[0]);
    return;
  }

  origin = parv[1];
  destination = parv[2];

  /* Now attempt to route the PONG, comstud pointed out routable PING
   * is used for SPING.  routable PING should also probably be left in
   *        -Dianora
   * That being the case, we will route, but only for registered clients (a
   * case can be made to allow them only from servers). -Shadowfax
   */
  if (!EmptyString(destination) && !match(destination, me.name) &&
      irccmp(destination, me.id))
  {
      if ((target_p = find_client(destination)) ||
          (target_p = find_server(destination)))
        sendto_one(target_p,":%s PONG %s %s",
                   parv[0], origin, destination);
      else
        {
          sendto_one(source_p, form_str(ERR_NOSUCHSERVER),
                     me.name, parv[0], destination);
          return;
        }
  }
}

static void
mr_pong(struct Client *client_p, struct Client *source_p,
        int parc, char *parv[])
{
  assert(source_p == client_p);

  if (parc == 2 && *parv[1] != '\0')
  {
    if (ConfigFileEntry.ping_cookie && !source_p->localClient->registration)
    {
      unsigned long incoming_ping = strtoul(parv[1], NULL, 10);

      if (incoming_ping)
      {
        if (source_p->localClient->random_ping == incoming_ping)
        {
          char buf[USERLEN + 1];

          strlcpy(buf, source_p->username, sizeof(buf));
          SetPingCookie(source_p);
          register_local_user(client_p, source_p, source_p->name, buf);
        }
        else
        {
          sendto_one(source_p, form_str(ERR_WRONGPONG), me.name,
                     source_p->name, source_p->localClient->random_ping);
          return;
        }
      }
    }
  }
  else
    sendto_one(source_p, form_str(ERR_NOORIGIN), me.name, parv[0]);
}

