/*
 * IRC - Internet Relay Chat, ircd/m_pong.c
 * Copyright (C) 1990 Jarkko Oikarinen and
 *                    University of Oulu, Computing Center
 *
 * See file AUTHORS in IRC package for additional names of
 * the programmers.
 *
 * 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 1, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * $Id: m_pong.c 499 2003-06-11 00:48:41Z r33d $
 */

/*
 * m_functions execute protocol messages on this server:
 *
 *    cptr    is always NON-NULL, pointing to a *LOCAL* client
 *            structure (with an open socket connected!). This
 *            identifies the physical socket where the message
 *            originated (or which caused the m_function to be
 *            executed--some m_functions may call others...).
 *
 *    sptr    is the source of the message, defined by the
 *            prefix part of the message if present. If not
 *            or prefix not found, then sptr==cptr.
 *
 *            (!IsServer(cptr)) => (cptr == sptr), because
 *            prefixes are taken *only* from servers...
 *
 *            (IsServer(cptr))
 *                    (sptr == cptr) => the message didn't
 *                    have the prefix.
 *
 *                    (sptr != cptr && IsServer(sptr) means
 *                    the prefix specified servername. (?)
 *
 *                    (sptr != cptr && !IsServer(sptr) means
 *                    that message originated from a remote
 *                    user (not local).
 *
 *            combining
 *
 *            (!IsServer(sptr)) means that, sptr can safely
 *            taken as defining the target structure of the
 *            message in this server.
 *
 *    *Always* true (if 'parse' and others are working correct):
 *
 *    1)      sptr->from == cptr  (note: cptr->from == cptr)
 *
 *    2)      MyConnect(sptr) <=> sptr == cptr (e.g. sptr
 *            *cannot* be a local connection, unless it's
 *            actually cptr!). [MyConnect(x) should probably
 *            be defined as (x == x->from) --msa ]
 *
 *    parc    number of variable parameter strings (if zero,
 *            parv is allowed to be NULL)
 *
 *    parv    a NULL terminated list of parameter pointers,
 *
 *                    parv[0], sender (prefix string), if not present
 *                            this points to an empty string.
 *                    parv[1]...parv[parc-1]
 *                            pointers to additional parameters
 *                    parv[parc] == NULL, *always*
 *
 *            note:   it is guaranteed that parv[0]..parv[parc-1] are all
 *                    non-NULL pointers.
 */
#include "config.h"

#include "client.h"
#include "hash.h"
#include "ircd.h"
#include "ircd_reply.h"
#include "ircd_string.h"
#include "msg.h"
#include "numeric.h"
#include "numnicks.h"
#include "opercmds.h"
#include "s_user.h"
#include "send.h"

#include <assert.h>
#include <string.h>
#include <stdlib.h>

/*
 * ms_pong - server message handler
 *
 * parv[0] = sender prefix
 * parv[1] = origin
 * parv[2] = destination
 */
int ms_pong(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
{
  char*          origin;
  char*          destination;
  assert(0 != cptr);
  assert(0 != sptr);
  assert(IsServer(cptr));

  if (parc < 2 || EmptyString(parv[1])) {
    return protocol_violation(sptr,"No Origin on PONG");
  }
  origin      = parv[1];
  destination = parv[2];
  ClrFlag(cptr, FLAG_PINGSENT);
  ClrFlag(sptr, FLAG_PINGSENT);
  cli_lasttime(cptr) = CurrentTime;

  if (parc > 5) {
    /* AsLL pong */
    cli_serv(cptr)->asll_rtt = atoi(militime_float(parv[3]));
    cli_serv(cptr)->asll_to = atoi(parv[4]);
    cli_serv(cptr)->asll_from = atoi(militime_float(parv[5]));
    return 0;
  }
  
  if (EmptyString(destination))
    return 0;

  if (*destination == '!') {
    /* AsLL ping reply from a non-AsLL server */
    cli_serv(cptr)->asll_rtt = atoi(militime_float(destination + 1));
  } else if (0 != ircd_strcmp(destination, cli_name(&me))) {
    struct Client* acptr;
    if ((acptr = FindClient(destination))) {
      sendcmdto_one(sptr, CMD_PONG, acptr, "%s %s", origin, destination);
    }
  }
  return 0;
}

/*
 * mr_pong - registration message handler
 *
 * parv[0] = sender prefix
 * parv[1] = pong response echo
 * NOTE: cptr is always unregistered here
 */
int mr_pong(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
{
  assert(0 != cptr);
  assert(cptr == sptr);
  assert(!IsRegistered(sptr));

  ClrFlag(cptr, FLAG_PINGSENT);
  cli_lasttime(cptr) = CurrentTime;
  /*
   * Check to see if this is a PONG :cookie reply from an
   * unregistered user.  If so, process it. -record
   */
  if (0 != cli_cookie(sptr) && COOKIE_VERIFIED != cli_cookie(sptr)) {
    if (parc > 1 && cli_cookie(sptr) == atol(parv[parc - 1])) {
      cli_cookie(sptr) = COOKIE_VERIFIED;
      if (cli_user(sptr) && *(cli_user(sptr))->host && (cli_name(sptr))[0])
        /*
         * NICK and USER OK
         */
        return register_user(cptr, sptr, cli_name(sptr), cli_user(sptr)->username);
    }
    else  
      send_reply(sptr, SND_EXPLICIT | ERR_BADPING,
		 ":To connect, type /QUOTE PONG %u", cli_cookie(sptr));
  }
  return 0;
}

/*
 * m_pong - normal message handler
 *
 * parv[0] = sender prefix
 * parv[1] = origin
 * parv[2] = destination
 */
int m_pong(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
{
  assert(0 != cptr);
  assert(cptr == sptr);
  ClrFlag(cptr, FLAG_PINGSENT);
  cli_lasttime(cptr) = CurrentTime;
  return 0;
}