m_nick.c

Unreal irc 服务器源代码

/*
 *   IRC - Internet Relay Chat, src/modules/m_nick.c
 *   (C) 1999-2005 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 CMD_FUNC(m_nick);
DLLFUNC int _register_user(aClient *cptr, aClient *sptr, char *nick, char *username, char *umode, char *virthost, char *ip);

#define MSG_NICK 	"NICK"	
#define TOK_NICK 	"&"	

ModuleHeader MOD_HEADER(m_nick)
  = {
	"m_nick",
	"$Id: m_nick.c,v 1.1.4.5 2006/12/22 21:10:33 syzop Exp $",
	"command /nick", 
	"3.2-b8-1",
	NULL 
    };

DLLFUNC int MOD_TEST(m_nick)(ModuleInfo *modinfo)
{
	MARK_AS_OFFICIAL_MODULE(modinfo);
	EfunctionAdd(modinfo->handle, EFUNC_REGISTER_USER, _register_user);
	return MOD_SUCCESS;
}

DLLFUNC int MOD_INIT(m_nick)(ModuleInfo *modinfo)
{
	CommandAdd(modinfo->handle, MSG_NICK, TOK_NICK, m_nick, MAXPARA, M_USER|M_SERVER|M_UNREGISTERED);
	MARK_AS_OFFICIAL_MODULE(modinfo);
	return MOD_SUCCESS;
}

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

DLLFUNC int MOD_UNLOAD(m_nick)(int module_unload)
{
	return MOD_SUCCESS;
}

static char buf[BUFSIZE];
static char spamfilter_user[NICKLEN + USERLEN + HOSTLEN + REALLEN + 64];

/*
** m_nick
**	parv[0] = sender prefix
**	parv[1] = nickname
**  if from new client  -taz
**	parv[2] = nick password
**  if from server:
**      parv[2] = hopcount
**      parv[3] = timestamp
**      parv[4] = username
**      parv[5] = hostname
**      parv[6] = servername
**  if NICK version 1:
**      parv[7] = servicestamp
**	parv[8] = info
**  if NICK version 2:
**	parv[7] = servicestamp
**      parv[8] = umodes
**	parv[9] = virthost, * if none
**	parv[10] = info
**  if NICKIP:
**      parv[10] = ip
**      parv[11] = info
*/
DLLFUNC CMD_FUNC(m_nick)
{
	aTKline *tklban;
	int ishold;
	aClient *acptr, *serv = NULL;
	aClient *acptrs;
	char nick[NICKLEN + 2], *s;
	Membership *mp;
	time_t lastnick = (time_t) 0;
	int  differ = 1, update_watch = 1;
	unsigned char newusr = 0, removemoder = 1;
	/*
	 * If the user didn't specify a nickname, complain
	 */
	if (parc < 2)
	{
		sendto_one(sptr, err_str(ERR_NONICKNAMEGIVEN),
		    me.name, parv[0]);
		return 0;
	}

	strncpyzt(nick, parv[1], NICKLEN + 1);

	if (MyConnect(sptr) && sptr->user && !IsAnOper(sptr))
	{
		if ((sptr->user->flood.nick_c >= NICK_COUNT) && 
		    (TStime() - sptr->user->flood.nick_t < NICK_PERIOD))
		{
			/* Throttle... */
			sendto_one(sptr, err_str(ERR_NCHANGETOOFAST), me.name, sptr->name, nick,
				(int)(NICK_PERIOD - (TStime() - sptr->user->flood.nick_t)));
			return 0;
		}
	}

	/* For a local clients, do proper nickname checking via do_nick_name()
	 * and reject the nick if it returns false.
	 * For remote clients, do a quick check by using do_remote_nick_name(),
	 * if this returned false then reject and kill it. -- Syzop
	 */
	if ((IsServer(cptr) && !do_remote_nick_name(nick)) ||
	    (!IsServer(cptr) && !do_nick_name(nick)))
	{
		sendto_one(sptr, err_str(ERR_ERRONEUSNICKNAME),
		    me.name, parv[0], parv[1], "Illegal characters");

		if (IsServer(cptr))
		{
			ircstp->is_kill++;
			sendto_failops("Bad Nick: %s From: %s %s",
			    parv[1], parv[0], get_client_name(cptr, FALSE));
			sendto_one(cptr, ":%s KILL %s :%s (%s <- %s[%s])",
			    me.name, parv[1], me.name, parv[1],
			    nick, cptr->name);
			if (sptr != cptr)
			{	/* bad nick change */
				sendto_serv_butone(cptr,
				    ":%s KILL %s :%s (%s <- %s!%s@%s)",
				    me.name, parv[0], me.name,
				    get_client_name(cptr, FALSE),
				    parv[0],
				    sptr->user ? sptr->username : "",
				    sptr->user ? sptr->user->server :
				    cptr->name);
				sptr->flags |= FLAGS_KILLED;
				return exit_client(cptr, sptr, &me, "BadNick");
			}
		}
		return 0;
	}

	/* Kill quarantined opers early... */
	if (IsServer(cptr) && (sptr->from->flags & FLAGS_QUARANTINE) &&
	    (parc >= 11) && strchr(parv[8], 'o'))
	{
		ircstp->is_kill++;
		/* Send kill to uplink only, hasn't been broadcasted to the rest, anyway */
		sendto_one(cptr, ":%s KILL %s :%s (Quarantined: no global oper privileges allowed)",
			me.name, parv[1], me.name);
		sendto_realops("QUARANTINE: Oper %s on server %s killed, due to quarantine",
			parv[1], sptr->name);
		/* (nothing to exit_client or to free, since user was never added) */
		return 0;
	}

	/*
	   ** Protocol 4 doesn't send the server as prefix, so it is possible
	   ** the server doesn't exist (a lagged net.burst), in which case
	   ** we simply need to ignore the NICK. Also when we got that server
	   ** name (again) but from another direction. --Run
	 */
	/*
	   ** We should really only deal with this for msgs from servers.
	   ** -- Aeto
	 */
	if (IsServer(cptr) &&
	    (parc > 7
	    && (!(serv = (aClient *)find_server_b64_or_real(parv[6]))
	    || serv->from != cptr->from)))
	{
		sendto_realops("Cannot find server %s (%s)", parv[6],
		    backupbuf);
		return 0;
	}
	/*
	   ** Check against nick name collisions.
	   **
	   ** Put this 'if' here so that the nesting goes nicely on the screen :)
	   ** We check against server name list before determining if the nickname
	   ** is present in the nicklist (due to the way the below for loop is
	   ** constructed). -avalon
	 */
	/* I managed to fuck this up i guess --stskeeps */
	if ((acptr = find_server(nick, NULL)))
	{
		if (MyConnect(sptr))
		{
#ifdef GUEST
			if (IsUnknown(sptr))
			{
				RunHook4(HOOKTYPE_GUEST, cptr, sptr, parc, parv);
				return 0;
			}
#endif
			sendto_one(sptr, err_str(ERR_NICKNAMEINUSE), me.name,
			    BadPtr(parv[0]) ? "*" : parv[0], nick);
			return 0;	/* NICK message ignored */
		}
	}

	/*
	   ** Check for a Q-lined nickname. If we find it, and it's our
	   ** client, just reject it. -Lefler
	   ** Allow opers to use Q-lined nicknames. -Russell
	 */
	if (!stricmp("ircd", nick))
	{
		sendto_one(sptr, err_str(ERR_ERRONEUSNICKNAME), me.name,
		    BadPtr(parv[0]) ? "*" : parv[0], nick,
		    "Reserved for internal IRCd purposes");
		return 0;
	}
	if (!stricmp("irc", nick))
	{
		sendto_one(sptr, err_str(ERR_ERRONEUSNICKNAME), me.name,
		    BadPtr(parv[0]) ? "*" : parv[0], nick,
		    "Reserved for internal IRCd purposes");
		return 0;
	}
	if (MyClient(sptr)) /* local client changin nick afterwards.. */
	{
		int xx;
		spamfilter_build_user_string(spamfilter_user, nick, sptr);
		xx = dospamfilter(sptr, spamfilter_user, SPAMF_USER, NULL, 0, NULL);
		if (xx < 0)
			return xx;
	}
	if (!IsULine(sptr) && (tklban = find_qline(sptr, nick, &ishold)))
	{
		if (IsServer(sptr) && !ishold) /* server introducing new client */
		{
			acptrs =
			    (aClient *)find_server_b64_or_real(sptr->user ==
			    NULL ? (char *)parv[6] : (char *)sptr->user->
			    server);
			/* (NEW: no unregistered q:line msgs anymore during linking) */
			if (!acptrs || (acptrs->serv && acptrs->serv->flags.synced))
				sendto_snomask(SNO_QLINE, "Q:lined nick %s from %s on %s", nick,
				    (*sptr->name != 0
				    && !IsServer(sptr) ? sptr->name : "<unregistered>"),
				    acptrs ? acptrs->name : "unknown server");
		}
		
		if (IsServer(cptr) && IsPerson(sptr) && !ishold) /* remote user changing nick */
		{
			sendto_snomask(SNO_QLINE, "Q:lined nick %s from %s on %s", nick,
				sptr->name, sptr->srvptr ? sptr->srvptr->name : "<unknown>");
		}

		if (!IsServer(cptr)) /* local */
		{
			if (ishold)
			{
				sendto_one(sptr, err_str(ERR_ERRONEUSNICKNAME),
				    me.name, BadPtr(parv[0]) ? "*" : parv[0],
				    nick, tklban->reason);
				return 0;
			}
			if (!IsOper(cptr))
			{
				sptr->since += 4; /* lag them up */
				sendto_one(sptr, err_str(ERR_ERRONEUSNICKNAME),
				    me.name, BadPtr(parv[0]) ? "*" : parv[0],
				    nick, tklban->reason);
				sendto_snomask(SNO_QLINE, "Forbidding Q-lined nick %s from %s.",
				    nick, get_client_name(cptr, FALSE));
				return 0;	/* NICK message ignored */
			}
		}
	}
	/*
	   ** acptr already has result from previous find_server()
	 */
	if (acptr)
	{
		/*
		   ** We have a nickname trying to use the same name as
		   ** a server. Send out a nick collision KILL to remove
		   ** the nickname. As long as only a KILL is sent out,
		   ** there is no danger of the server being disconnected.
		   ** Ultimate way to jupiter a nick ? >;-). -avalon
		 */
		sendto_failops("Nick collision on %s(%s <- %s)",
		    sptr->name, acptr->from->name,
		    get_client_name(cptr, FALSE));
		ircstp->is_kill++;
		sendto_one(cptr, ":%s KILL %s :%s (%s <- %s)",
		    me.name, sptr->name, me.name, acptr->from->name,
		    /* NOTE: Cannot use get_client_name
		       ** twice here, it returns static
		       ** string pointer--the other info
		       ** would be lost
		     */
		    get_client_name(cptr, FALSE));
		sptr->flags |= FLAGS_KILLED;
		return exit_client(cptr, sptr, &me, "Nick/Server collision");
	}

	if (MyClient(cptr) && !IsOper(cptr))
		cptr->since += 3;	/* Nick-flood prot. -Donwulff */

	if (!(acptr = find_client(nick, NULL)))
		goto nickkilldone;	/* No collisions, all clear... */
	/*
	   ** If the older one is "non-person", the new entry is just
	   ** allowed to overwrite it. Just silently drop non-person,
	   ** and proceed with the nick. This should take care of the
	   ** "dormant nick" way of generating collisions...
	 */
	/* Moved before Lost User Field to fix some bugs... -- Barubary */
	if (IsUnknown(acptr) && MyConnect(acptr))
	{
		/* This may help - copying code below */
		if (acptr == cptr)
			return 0;
		acptr->flags |= FLAGS_KILLED;
		exit_client(NULL, acptr, &me, "Overridden");
		goto nickkilldone;
	}
	/* A sanity check in the user field... */
	if (acptr->user == NULL)
	{
		/* This is a Bad Thing */
		sendto_failops("Lost user field for %s in change from %s",
		    acptr->name, get_client_name(cptr, FALSE));
		ircstp->is_kill++;
		sendto_one(acptr, ":%s KILL %s :%s (Lost user field!)",
		    me.name, acptr->name, me.name);
		acptr->flags |= FLAGS_KILLED;
		/* Here's the previous versions' desynch.  If the old one is
		   messed up, trash the old one and accept the new one.
		   Remember - at this point there is a new nick coming in!
		   Handle appropriately. -- Barubary */
		exit_client(NULL, acptr, &me, "Lost user field");
		goto nickkilldone;
	}
	/*
	   ** If acptr == sptr, then we have a client doing a nick
	   ** change between *equivalent* nicknames as far as server
	   ** is concerned (user is changing the case of his/her
	   ** nickname or somesuch)
	 */
	if (acptr == sptr) {
		if (strcmp(acptr->name, nick) != 0)
		{
			/* Allows change of case in his/her nick */
			removemoder = 0; /* don't set the user -r */
			goto nickkilldone;	/* -- go and process change */
		} else
			/*
			 ** This is just ':old NICK old' type thing.
			 ** Just forget the whole thing here. There is
			 ** no point forwarding it to anywhere,
			 ** especially since servers prior to this
			 ** version would treat it as nick collision.
			 */
			return 0;	/* NICK Message ignored */
	}
	/*
	   ** Note: From this point forward it can be assumed that
	   ** acptr != sptr (point to different client structures).
	 */
	/*
	   ** Decide, we really have a nick collision and deal with it
	 */
	if (!IsServer(cptr))
	{
		/*
		   ** NICK is coming from local client connection. Just
		   ** send error reply and ignore the command.