/*
 *  ircd-ratbox: A slightly useful ircd.
 *  m_pong.c: The reply to a ping message.
 *
 *  Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
 *  Copyright (C) 1996-2002 Hybrid Development Team
 *  Copyright (C) 2002-2005 ircd-ratbox development team
 *
 *  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
 *
 */

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

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

struct Message pong_msgtab = {
    "PONG", 0, 0, 0, MFLG_SLOW | MFLG_UNREG,
    {{mr_pong, 0}, mg_ignore, mg_ignore, {ms_pong, 2}, mg_ignore, mg_ignore}
};

mapi_clist_av1 pong_clist[] = { &pong_msgtab, NULL };
DECLARE_MODULE_AV1(pong, NULL, NULL, pong_clist, NULL, NULL, "$Revision: 3181 $");

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

    destination = parv[2];
    source_p->flags &= ~FLAGS_PINGSENT;

    /* 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)))
            sendto_one(target_p, ":%s PONG %s %s",
                       get_id(source_p, target_p), parv[1],
                       get_id(target_p, target_p));
        else {
            if(!IsDigit(*destination))
                sendto_one_numeric(source_p, ERR_NOSUCHSERVER,
                                   form_str(ERR_NOSUCHSERVER), destination);
            return 0;
        }
    }

    /* destination is us, emulate EOB */
    if(IsServer(source_p) && !HasSentEob(source_p)) {
        if(MyConnect(source_p))
            sendto_realops_snomask(SNO_GENERAL, L_ALL,
                                   "End of burst (emulated) from %s (%d seconds)",
                                   source_p->name,
                                   (signed int) (rb_current_time() - source_p->localClient->firsttime));
        SetEob(source_p);
        eob_count++;
        call_hook(h_server_eob, source_p);
    }

    return 0;
}

static int
mr_pong(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
    if(parc == 2 && !EmptyString(parv[1])) {
        if(ConfigFileEntry.ping_cookie && source_p->flags & FLAGS_SENTUSER && source_p->name[0]) {
            unsigned long incoming_ping = strtoul(parv[1], NULL, 16);
            if(incoming_ping) {
                if(source_p->localClient->random_ping == incoming_ping) {
                    char buf[USERLEN + 1];
                    rb_strlcpy(buf, source_p->username, sizeof(buf));
                    source_p->flags |= FLAGS_PING_COOKIE;
                    register_local_user(client_p, source_p, buf);
                } else {
                    sendto_one(source_p, form_str(ERR_WRONGPONG),
                               me.name, source_p->name,
                               source_p->localClient->random_ping);
                    return 0;
                }
            }
        }

    } else
        sendto_one(source_p, form_str(ERR_NOORIGIN), me.name, source_p->name);

    source_p->flags &= ~FLAGS_PINGSENT;

    return 0;
}