]>
jfr.im git - irc/quakenet/snircd.git/blob - ircd/m_nick.c
2 * IRC - Internet Relay Chat, ircd/m_nick.c
3 * Copyright (C) 1990 Jarkko Oikarinen and
4 * University of Oulu, Computing Center
6 * See file AUTHORS in IRC package for additional names of
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 1, or (at your option)
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 * $Id: m_nick.c,v 1.25 2005/03/19 23:22:09 entrope Exp $
27 * m_functions execute protocol messages on this server:
29 * cptr is always NON-NULL, pointing to a *LOCAL* client
30 * structure (with an open socket connected!). This
31 * identifies the physical socket where the message
32 * originated (or which caused the m_function to be
33 * executed--some m_functions may call others...).
35 * sptr is the source of the message, defined by the
36 * prefix part of the message if present. If not
37 * or prefix not found, then sptr==cptr.
39 * (!IsServer(cptr)) => (cptr == sptr), because
40 * prefixes are taken *only* from servers...
43 * (sptr == cptr) => the message didn't
46 * (sptr != cptr && IsServer(sptr) means
47 * the prefix specified servername. (?)
49 * (sptr != cptr && !IsServer(sptr) means
50 * that message originated from a remote
55 * (!IsServer(sptr)) means that, sptr can safely
56 * taken as defining the target structure of the
57 * message in this server.
59 * *Always* true (if 'parse' and others are working correct):
61 * 1) sptr->from == cptr (note: cptr->from == cptr)
63 * 2) MyConnect(sptr) <=> sptr == cptr (e.g. sptr
64 * *cannot* be a local connection, unless it's
65 * actually cptr!). [MyConnect(x) should probably
66 * be defined as (x == x->from) --msa ]
68 * parc number of variable parameter strings (if zero,
69 * parv is allowed to be NULL)
71 * parv a NULL terminated list of parameter pointers,
73 * parv[0], sender (prefix string), if not present
74 * this points to an empty string.
75 * parv[1]...parv[parc-1]
76 * pointers to additional parameters
77 * parv[parc] == NULL, *always*
79 * note: it is guaranteed that parv[0]..parv[parc-1] are all
88 #include "ircd_chattr.h"
89 #include "ircd_features.h"
91 #include "ircd_reply.h"
92 #include "ircd_string.h"
102 /* #include <assert.h> -- Now using assert in ircd_log.h */
107 * 'do_nick_name' ensures that the given parameter (nick) is really a proper
108 * string for a nickname (note, the 'nick' may be modified in the process...)
110 * RETURNS the length of the final NICKNAME (0, if nickname is invalid)
112 * Nickname characters are in range 'A'..'}', '_', '-', '0'..'9'
113 * anything outside the above set will terminate nickname.
114 * In addition, the first character cannot be '-' or a Digit.
117 * The '~'-character should be allowed, but a change should be global,
118 * some confusion would result if only few servers allowed it...
120 static int do_nick_name(char* nick
)
123 char* end
= ch
+ NICKLEN
;
126 /* first character in [0..9-] */
127 if (*ch
== '-' || IsDigit(*ch
))
129 for ( ; (ch
< end
) && *ch
; ++ch
)
130 if (!IsNickChar(*ch
))
139 * m_nick - message handler for local clients
140 * parv[0] = sender prefix
143 int m_nick(struct Client
* cptr
, struct Client
* sptr
, int parc
, char* parv
[])
145 struct Client
* acptr
;
146 char nick
[NICKLEN
+ 2];
149 const char* client_name
;
152 assert(cptr
== sptr
);
155 * parv[0] will be empty for clients connecting for the first time
157 client_name
= (*(cli_name(sptr
))) ? cli_name(sptr
) : "*";
160 send_reply(sptr
, ERR_NONICKNAMEGIVEN
);
164 * Don't let them send make us send back a really long string of
168 if (strlen(arg
) > IRCD_MIN(NICKLEN
, feature_int(FEAT_NICKLEN
)))
169 arg
[IRCD_MIN(NICKLEN
, feature_int(FEAT_NICKLEN
))] = '\0';
171 if ((s
= strchr(arg
, '~')))
177 * If do_nick_name() returns a null name then reject it.
179 if (0 == do_nick_name(nick
)) {
180 send_reply(sptr
, ERR_ERRONEUSNICKNAME
, arg
);
185 * Check if this is a LOCAL user trying to use a reserved (Juped)
186 * nick, if so tell him that it's a nick in use...
188 if (isNickJuped(nick
)) {
189 send_reply(sptr
, ERR_NICKNAMEINUSE
, nick
);
190 return 0; /* NICK message ignored */
193 if (!(acptr
= FindClient(nick
))) {
195 * No collisions, all clear...
197 return set_nick_name(cptr
, sptr
, nick
, parc
, parv
);
199 if (IsServer(acptr
)) {
200 send_reply(sptr
, ERR_NICKNAMEINUSE
, nick
);
201 return 0; /* NICK message ignored */
204 * If acptr == sptr, then we have a client doing a nick
205 * change between *equivalent* nicknames as far as server
206 * is concerned (user is changing the case of his/her
207 * nickname or somesuch)
211 * If acptr == sptr, then we have a client doing a nick
212 * change between *equivalent* nicknames as far as server
213 * is concerned (user is changing the case of his/her
214 * nickname or somesuch)
216 if (0 != strcmp(cli_name(acptr
), nick
)) {
218 * Allows change of case in his/her nick
220 return set_nick_name(cptr
, sptr
, nick
, parc
, parv
);
223 * This is just ':old NICK old' type thing.
224 * Just forget the whole thing here. There is
225 * no point forwarding it to anywhere,
226 * especially since servers prior to this
227 * version would treat it as nick collision.
232 * Note: From this point forward it can be assumed that
233 * acptr != sptr (point to different client structures).
235 assert(acptr
!= sptr
);
237 * If the older one is "non-person", the new entry is just
238 * allowed to overwrite it. Just silently drop non-person,
239 * and proceed with the nick. This should take care of the
240 * "dormant nick" way of generating collisions...
242 * XXX - hmmm can this happen after one is registered?
244 * Yes, client 1 connects to IRC and registers, client 2 connects and
245 * sends "NICK foo" but doesn't send anything more. client 1 now does
246 * /nick foo, they should succeed and client 2 gets disconnected with
249 if (IsUnknown(acptr
) && MyConnect(acptr
)) {
250 ServerStats
->is_ref
++;
251 IPcheck_connect_fail(acptr
);
252 exit_client(cptr
, acptr
, &me
, "Overridden by other sign on");
253 return set_nick_name(cptr
, sptr
, nick
, parc
, parv
);
256 * NICK is coming from local client connection. Just
257 * send error reply and ignore the command.
259 send_reply(sptr
, ERR_NICKNAMEINUSE
, nick
);
260 return 0; /* NICK message ignored */
265 * ms_nick - server message handler for nicks
266 * parv[0] = sender prefix
269 * If from server, source is client:
270 * parv[2] = timestamp
274 * parv[3] = timestamp
277 * parv[6] = umode (optional)
278 * parv[parc-3] = IP# <- Only Protocol >= 10
279 * parv[parc-2] = YXX, numeric nick <- Only Protocol >= 10
280 * parv[parc-1] = info
283 int ms_nick(struct Client
* cptr
, struct Client
* sptr
, int parc
, char* parv
[])
285 struct Client
*acptr
;
286 char nick
[NICKLEN
+ 2];
293 assert(IsServer(cptr
));
295 if ((IsServer(sptr
) && parc
< 8) || parc
< 3)
297 sendto_opmask_butone(0, SNO_OLDSNO
, "bad NICK param count for %s from %C",
299 return need_more_params(sptr
, "NICK");
302 ircd_strncpy(nick
, parv
[1], NICKLEN
);
303 nick
[NICKLEN
] = '\0';
307 lastnick
= atoi(parv
[3]);
308 if (lastnick
> OLDEST_TS
&& !IsBurstOrBurstAck(sptr
))
309 cli_serv(sptr
)->lag
= TStime() - lastnick
;
313 lastnick
= atoi(parv
[2]);
314 if (lastnick
> OLDEST_TS
&& !IsBurstOrBurstAck(sptr
))
315 cli_serv(cli_user(sptr
)->server
)->lag
= TStime() - lastnick
;
318 * If do_nick_name() returns a null name OR if the server sent a nick
319 * name and do_nick_name() changed it in some way (due to rules of nick
320 * creation) then reject it. If from a server and we reject it,
321 * and KILL it. -avalon 4/4/92
323 if (!do_nick_name(nick
) || strcmp(nick
, parv
[1]))
325 send_reply(sptr
, ERR_ERRONEUSNICKNAME
, parv
[1]);
327 ++ServerStats
->is_kill
;
328 sendto_opmask_butone(0, SNO_OLDSNO
, "Bad Nick: %s From: %s %C", parv
[1],
330 sendcmdto_one(&me
, CMD_KILL
, cptr
, "%s :%s (%s <- %s[%s])",
331 IsServer(sptr
) ? parv
[parc
- 2] : parv
[0], cli_name(&me
), parv
[1],
332 nick
, cli_name(cptr
));
338 sendcmdto_serv_butone(&me
, CMD_KILL
, 0, "%s :%s (%s <- %s!%s@%s)",
339 parv
[0], cli_name(&me
), cli_name(cptr
), parv
[0],
340 cli_user(sptr
) ? cli_username(sptr
) : "",
341 cli_user(sptr
) ? cli_name(cli_user(sptr
)->server
) :
346 /* Check against nick name collisions. */
347 if ((acptr
= FindClient(nick
)) == NULL
)
348 /* No collisions, all clear... */
349 return set_nick_name(cptr
, sptr
, nick
, parc
, parv
);
352 * If acptr == sptr, then we have a client doing a nick
353 * change between *equivalent* nicknames as far as server
354 * is concerned (user is changing the case of his/her
355 * nickname or somesuch)
359 if (strcmp(cli_name(acptr
), nick
) != 0)
360 /* Allows change of case in his/her nick */
361 return set_nick_name(cptr
, sptr
, nick
, parc
, parv
);
363 /* Setting their nick to what it already is? Ignore it. */
366 /* now we know we have a real collision. */
368 * Note: From this point forward it can be assumed that
369 * acptr != sptr (point to different client structures).
371 assert(acptr
!= sptr
);
373 * If the older one is "non-person", the new entry is just
374 * allowed to overwrite it. Just silently drop non-person,
375 * and proceed with the nick. This should take care of the
376 * "dormant nick" way of generating collisions...
378 if (IsUnknown(acptr
) && MyConnect(acptr
))
380 ServerStats
->is_ref
++;
381 IPcheck_connect_fail(acptr
);
382 exit_client(cptr
, acptr
, &me
, "Overridden by other sign on");
383 return set_nick_name(cptr
, sptr
, nick
, parc
, parv
);
386 * Decide, we really have a nick collision and deal with it
389 * NICK was coming from a server connection.
390 * This means we have a race condition (two users signing on
391 * at the same time), or two net fragments reconnecting with the same nick.
392 * The latter can happen because two different users connected
393 * or because one and the same user switched server during a net break.
394 * If the TimeStamps are equal, we kill both (or only 'new'
395 * if it was a ":server NICK new ...").
396 * Otherwise we kill the youngest when user@host differ,
397 * or the oldest when they are the same.
398 * We treat user and ~user as different, because if it wasn't
399 * a faked ~user the AUTH wouldn't have added the '~'.
405 struct irc_in_addr ip
;
407 * A new NICK being introduced by a neighbouring
408 * server (e.g. message type ":server NICK new ..." received)
410 * compare IP address and username
412 base64toip(parv
[parc
- 3], &ip
);
413 differ
= (0 != memcmp(&cli_ip(acptr
), &ip
, sizeof(cli_ip(acptr
)))) ||
414 (0 != ircd_strcmp(cli_user(acptr
)->username
, parv
[4]));
415 sendto_opmask_butone(0, SNO_OLDSNO
, "Nick collision on %C (%C %Tu <- "
416 "%C %Tu (%s user@host))", acptr
, cli_from(acptr
),
417 cli_lastnick(acptr
), cptr
, lastnick
,
418 differ
? "Different" : "Same");
423 * A NICK change has collided (e.g. message type ":old NICK new").
425 * compare IP address and username
427 differ
= (0 != memcmp(&cli_ip(acptr
), &cli_ip(sptr
), sizeof(cli_ip(acptr
)))) ||
428 (0 != ircd_strcmp(cli_user(acptr
)->username
, cli_user(sptr
)->username
));
429 sendto_opmask_butone(0, SNO_OLDSNO
, "Nick change collision from %C to "
430 "%C (%C %Tu <- %C %Tu)", sptr
, acptr
, cli_from(acptr
),
431 cli_lastnick(acptr
), cptr
, lastnick
);
433 type
= differ
? "older nick overruled" : "nick collision from same user@host";
435 * Now remove (kill) the nick on our side if it is the youngest.
436 * If no timestamp was received, we ignore the incoming nick
437 * (and expect a KILL for our legit nick soon ):
438 * When the timestamps are equal we kill both nicks. --Run
439 * acptr->from != cptr should *always* be true (?).
441 * This exits the client sending the NICK message
443 if ((differ
&& lastnick
>= cli_lastnick(acptr
)) ||
444 (!differ
&& lastnick
<= cli_lastnick(acptr
)))
446 /* We need to bounce this kill straight back... Although the nick message
447 * for acptr is probably waiting in their recvq from me, its also possible
448 * that sptr will change their nick on cptr before cptr receives the
449 * nick message for acptr, which would leave acptr and sptr both alive
450 * on cptr, but only acptr alive on me, i.e. desync. This extra kill
451 * message has been absent for a while in ircu although it was a major
452 * problem when it was tried on efnet, so I don't know how big an issue it
453 * is. Probably best that this be left here, anyway...
455 ServerStats
->is_kill
++;
456 sendcmdto_one(&me
, CMD_KILL
, cptr
, "%s :%s (%s)",
457 nick
, cli_name(&me
), type
);
458 /* But if this was a nick change and not a nick introduction,
459 * we also need to ensure that we remove our local state
460 * record of the original client... Also, the rest of the
461 * net should be informed...
465 assert(!MyConnect(sptr
));
466 /* Inform the rest of the net... */
467 sendcmdto_serv_butone(&me
, CMD_KILL
, cptr
, "%s :%s (%s)",
468 nick
, cli_name(&me
), type
);
469 /* Don't go sending off a QUIT message... */
470 SetFlag(sptr
, FLAG_KILLED
);
471 /* Remove them locally. */
472 exit_client_msg(cptr
, sptr
, &me
,
474 feature_str(FEAT_HIS_SERVERNAME
), type
);
476 * We have killed sptr off, zero out it's pointer so if it's used
477 * again we'll know about it --Bleep
481 /* If the timestamps differ and we just killed sptr, we don't need to kill
484 if (lastnick
!= cli_lastnick(acptr
))
487 /* Tell acptr why we are killing it. */
488 send_reply(acptr
, ERR_NICKCOLLISION
, nick
);
490 ServerStats
->is_kill
++;
491 SetFlag(acptr
, FLAG_KILLED
);
493 * This exits the client we had before getting the NICK message
495 sendcmdto_serv_butone(&me
, CMD_KILL
, NULL
, "%C :%s"
496 " (%s)", acptr
, feature_str(FEAT_HIS_SERVERNAME
),
498 exit_client_msg(cptr
, acptr
, &me
, "Killed (%s (%s))",
499 feature_str(FEAT_HIS_SERVERNAME
), type
);
500 if (lastnick
== cli_lastnick(acptr
))
504 return set_nick_name(cptr
, sptr
, nick
, parc
, parv
);