/************************************************************************
 *   IRC - Internet Relay Chat, modules/m_svinfo.c
 *
 *   Copyright (C) 2000-2003 TR-IRCD Development
 *
 *   Copyright (C) 1990 Jarkko Oikarinen and
 *                      University of Oulu, Co 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 2, 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_svinfo.c,v 1.5 2004/02/24 19:03:32 tr-ircd Exp $ 
     */

#include "struct.h"
#include "common.h"
#include "sys.h"
#include "numeric.h"
#include "msg.h"
#include "channel.h"
#include "s_conf.h"
#include "zlink.h"
#include "h.h"

static char *token = TOK1_SVINFO;

static struct Message _msgtab[] = {
    {MSG_SVINFO, 0, MAXPARA, M_SLOW, 0L,
     m_svinfo, m_ignore, m_ignore, m_svinfo, m_ignore}
};

#ifndef STATIC_MODULES

char *_version = "$Revision: 1.5 $";

void _modinit(void)
{
    mod_add_cmd(_msgtab);
    tok1_msgtab[(u_char) *token].msg = _msgtab;
}

void _moddeinit(void)
{
    mod_del_cmd(_msgtab);
    tok1_msgtab[(u_char) *token].msg = NULL;
}
#else
void m_svinfo_init(void)
{
    mod_add_cmd(_msgtab);
    tok1_msgtab[(u_char) *token].msg = _msgtab;
}
#endif

/*
 * * m_svinfo 
 *       parv[0] = sender prefix 
 *       parv[1] = TS_CURRENT for the server 
 *       parv[2] = TS_MIN for the server 
 *       parv[3] = server is standalone or connected to non-TS only 
 *       parv[4] = server's idea of UTC time
 */
int m_svinfo(aClient *cptr, aClient *sptr, int parc, char *parv[])
{
    time_t deltat, tmptime, theirtime;

    if (!IsServer(sptr) || !MyConnect(sptr))
	return 0;

    if (!DoesTS(sptr)) {
	sendto_one_server(cptr, NULL, TOK1_ERROR,
			  ":No Access (Your side uses too old TS Protocol)");
	sendto_gnotice("Access denied to %s (Version mismatch - TS Protocol too old)", sptr->name);
	return exit_client(cptr, cptr, "Protocol mismatch");
    }

    if (!IsTS7(sptr)) {  
        sendto_one_server(cptr, NULL, TOK1_ERROR,
                          ":No Access (Your side uses too incompatible TS Protocol)");
        sendto_gnotice("Access denied to %s (Version mismatch - TS Protocol incompatible)", sptr->name);
        return exit_client(cptr, cptr, "Protocol mismatch");
    }

    if (parc == 2) {
	if (irc_strcmp(parv[1], "ZIP") == 0) {
	    SetZipIn(sptr);
	    sptr->serv->zin = input_unzipstream();
	    sendto_gnotice("from %C: Input from %s is now compressed",
			   &me, get_client_name(sptr, HIDEME));
	    sendto_serv_butone(sptr, &me, TOK1_GNOTICE,
			       ":Input from %s is now compressed", get_client_name(sptr, HIDEME));
	    return ZIP_NEXT_BUFFER;
	}
    }

    if (parc == 5) {

	if (TS_CURRENT < atoi(parv[2]) || atoi(parv[1]) < TS_MIN) {
	    /*
	     * a server with the wrong TS version connected; since we're
	     * TS_ONLY we can't fall back to the non-TS protocol so we drop
	     * the link  -orabidoo
	     */
	    sendto_gnotice("Link %s dropped, wrong TS protocol version (%s,%s)",
		       get_client_name(sptr, HIDEME), parv[1], parv[2]);
	    return exit_client(sptr, sptr, "Incompatible TS version");
	}

	tmptime = time(NULL);
	theirtime = atol(parv[4]);
	deltat = abs(theirtime - tmptime);

	if (deltat > ServerOpts.ts_max_delta) {
	    sendto_gnotice
		("Link %s dropped, excessive TS delta (my TS=%ld, their TS=%ld, delta=%ld)",
		 get_client_name(sptr, HIDEME), tmptime, theirtime, deltat);
	    sendto_serv_butone(sptr, &me, TOK1_GNOTICE,
			       ":Link %s dropped, excessive TS delta (delta=%ld)",
			       get_client_name(sptr, HIDEME), deltat);
	    return exit_client(sptr, sptr, "Excessive TS delta");
	}

	if (deltat > ServerOpts.ts_warn_delta) {
	    sendto_gnotice
		("Link %s notable TS delta (my TS=%ld, their TS=%ld, delta=%ld)",
		 get_client_name(sptr, HIDEME), tmptime, theirtime, deltat);
	}
    }
    return 0;
}