unrealircd/src/modules/m_squit.c

/*
 *   IRC - Internet Relay Chat, src/modules/m_squit.c
 *   (C) 2004 The UnrealIRCd Team
 *
 *   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.
 */
#include "config.h"
#include "struct.h"
#include "common.h"
#include "sys.h"
#include "numeric.h"
#include "msg.h"
#include "proto.h"
#include "channel.h"
#include <time.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef _WIN32
#include <io.h>
#endif
#include <fcntl.h>
#include "h.h"
#ifdef STRIPBADWORDS
#include "badwords.h"
#endif
#ifdef _WIN32
#include "version.h"
#endif

DLLFUNC int m_squit(aClient *cptr, aClient *sptr, int parc, char *parv[]);

#define MSG_SQUIT 	"SQUIT"	
#define TOK_SQUIT 	"-"	

ModuleHeader MOD_HEADER(m_squit)
  = {
	"m_squit",
	"$Id$",
	"command /squit", 
	"3.2-b8-1",
	NULL 
    };

DLLFUNC int MOD_INIT(m_squit)(ModuleInfo *modinfo)
{
	add_Command(MSG_SQUIT, TOK_SQUIT, m_squit, 2);
	MARK_AS_OFFICIAL_MODULE(modinfo);
	return MOD_SUCCESS;
}

DLLFUNC int MOD_LOAD(m_squit)(int module_load)
{
	return MOD_SUCCESS;
}

DLLFUNC int MOD_UNLOAD(m_squit)(int module_unload)
{
	if (del_Command(MSG_SQUIT, TOK_SQUIT, m_squit) < 0)
	{
		sendto_realops("Failed to delete commands when unloading %s",
			MOD_HEADER(m_squit).name);
	}
	return MOD_SUCCESS;
}

/*
** m_squit
**	parv[0] = sender prefix
**	parv[1] = server name
**	parv[parc-1] = comment
*/
CMD_FUNC(m_squit)
{
	char *server;
	aClient *acptr;
	char *comment = (parc > 2 && parv[parc - 1]) ?
	    parv[parc - 1] : cptr->name;


	if (!IsPrivileged(sptr))
	{
		sendto_one(sptr, err_str(ERR_NOPRIVILEGES), me.name, parv[0]);
		return 0;
	}

	if (parc > 1)
	{
		if (!(*parv[1] == '@'))
		{
			server = parv[1];

			/*
			   ** The following allows wild cards in SQUIT. Only usefull
			   ** when the command is issued by an oper.
			 */
			for (acptr = client;
			    (acptr = next_client(acptr, server));
			    acptr = acptr->next)
				if (IsServer(acptr) || IsMe(acptr))
					break;
			if (acptr && IsMe(acptr))
			{
				acptr = cptr;
				server = cptr->sockhost;
			}
		}
		else
		{
			server = parv[1];
			acptr = (aClient *)find_server_by_base64(server + 1);
			if (acptr && IsMe(acptr))
			{
				acptr = cptr;
				server = cptr->sockhost;
			}
		}
	}
	else
	{
		/*
		   ** This is actually protocol error. But, well, closing
		   ** the link is very proper answer to that...
		 */
		server = cptr->sockhost;
		acptr = cptr;
	}

	/*
	   ** SQUIT semantics is tricky, be careful...
	   **
	   ** The old (irc2.2PL1 and earlier) code just cleans away the
	   ** server client from the links (because it is never true
	   ** "cptr == acptr".
	   **
	   ** This logic here works the same way until "SQUIT host" hits
	   ** the server having the target "host" as local link. Then it
	   ** will do a real cleanup spewing SQUIT's and QUIT's to all
	   ** directions, also to the link from which the orinal SQUIT
	   ** came, generating one unnecessary "SQUIT host" back to that
	   ** link.
	   **
	   ** One may think that this could be implemented like
	   ** "hunt_server" (e.g. just pass on "SQUIT" without doing
	   ** nothing until the server having the link as local is
	   ** reached). Unfortunately this wouldn't work in the real life,
	   ** because either target may be unreachable or may not comply
	   ** with the request. In either case it would leave target in
	   ** links--no command to clear it away. So, it's better just
	   ** clean out while going forward, just to be sure.
	   **
	   ** ...of course, even better cleanout would be to QUIT/SQUIT
	   ** dependant users/servers already on the way out, but
	   ** currently there is not enough information about remote
	   ** clients to do this...   --msa
	 */
	if (!acptr)
	{
		sendto_one(sptr, err_str(ERR_NOSUCHSERVER),
		    me.name, parv[0], server);
		return 0;
	}
	if (MyClient(sptr) && ((!OPCanGRoute(sptr) && !MyConnect(acptr)) ||
	    (!OPCanLRoute(sptr) && MyConnect(acptr))))
	{
		sendto_one(sptr, err_str(ERR_NOPRIVILEGES), me.name, parv[0]);
		return 0;
	}
	/*
	   **  Notify all opers, if my local link is remotely squitted
	 */
	if (MyConnect(acptr) && !IsAnOper(cptr))
	{

		sendto_locfailops("Received SQUIT %s from %s (%s)",
		    acptr->name, get_client_name(sptr, FALSE), comment);
		sendto_serv_butone(&me,
		    ":%s GLOBOPS :Received SQUIT %s from %s (%s)", me.name,
		    server, get_client_name(sptr, FALSE), comment);
	}
	else if (MyConnect(acptr))
	{
		if (acptr->user)
		{
			sendto_one(sptr,
			    ":%s %s %s :*** Cannot do fake kill by SQUIT !!!",
			    me.name, IsWebTV(sptr) ? "PRIVMSG" : "NOTICE", sptr->name);
			sendto_ops
			    ("%s tried to do a fake kill using SQUIT (%s (%s))",
			    sptr->name, acptr->name, comment);
			sendto_serv_butone(&me,
			    ":%s GLOBOPS :%s tried to fake kill using SQUIT (%s (%s))",
			    me.name, sptr->name, acptr->name, comment);
			return 0;
		}
		sendto_locfailops("Received SQUIT %s from %s (%s)",
		    acptr->name, get_client_name(sptr, FALSE), comment);
		sendto_serv_butone(&me,
		    ":%s GLOBOPS :Received SQUIT %s from %s (%s)", me.name,
		    acptr->name, get_client_name(sptr, FALSE), comment);
	}
	if (IsAnOper(sptr))
	{
		/*
		 * It was manually /squit'ed by a human being(we hope),
		 * there is a very good chance they don't want us to
		 * reconnect right away.  -Cabal95
		 */
		acptr->flags |= FLAGS_SQUIT;
	}

	return exit_client(cptr, acptr, sptr, comment);
}