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189935b1 | 1 | /* |
2 | * IRC - Internet Relay Chat, ircd/ircd_relay.c | |
3 | * Copyright (C) 1990 Jarkko Oikarinen and | |
4 | * University of Oulu, Computing Center | |
5 | * | |
6 | * See file AUTHORS in IRC package for additional names of | |
7 | * the programmers. | |
8 | * | |
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) | |
12 | * any later version. | |
13 | * | |
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. | |
18 | * | |
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. | |
22 | */ | |
23 | /** @file | |
24 | * @brief Helper functions to relay various types of messages. | |
25 | * @version $Id: ircd_relay.c,v 1.17 2004/12/11 05:13:45 klmitch Exp $ | |
26 | * | |
27 | * There are four basic types of messages, each with four subtypes. | |
28 | * | |
29 | * The basic types are: channel, directed, masked, and private. | |
30 | * Channel messages are (perhaps obviously) sent directly to a | |
31 | * channel. Directed messages are sent to "NICK[%host]@server", but | |
32 | * only allowed if the server is a services server (to avoid | |
33 | * information leaks for normal clients). Masked messages are sent to | |
34 | * either *@*host.mask or *.server.mask. Private messages are sent to | |
35 | * NICK. | |
36 | * | |
37 | * The subtypes for each type are: client message, client notice, | |
38 | * server message, and server notice. Client subtypes are sent by a | |
39 | * local user, and server subtypes are given to us by a server. | |
40 | * Notice subtypes correspond to the NOTICE command, and message | |
41 | * subtypes correspond to the PRIVMSG command. | |
42 | * | |
43 | * As a special note, directed messages do not have server subtypes, | |
44 | * since there is no difference in handling them based on origin. | |
45 | */ | |
46 | #include "config.h" | |
47 | ||
48 | #include "ircd_relay.h" | |
49 | #include "channel.h" | |
50 | #include "client.h" | |
51 | #include "hash.h" | |
52 | #include "ircd.h" | |
53 | #include "ircd_chattr.h" | |
54 | #include "ircd_features.h" | |
55 | #include "ircd_log.h" | |
56 | #include "ircd_reply.h" | |
57 | #include "ircd_string.h" | |
58 | #include "match.h" | |
59 | #include "msg.h" | |
60 | #include "numeric.h" | |
61 | #include "numnicks.h" | |
62 | #include "s_debug.h" | |
63 | #include "s_misc.h" | |
64 | #include "s_user.h" | |
65 | #include "send.h" | |
66 | ||
67 | /* #include <assert.h> -- Now using assert in ircd_log.h */ | |
68 | #include <stdio.h> | |
69 | #include <stdlib.h> | |
70 | #include <string.h> | |
71 | ||
72 | /* | |
73 | * This file contains message relaying functions for client and server | |
74 | * private messages and notices | |
75 | * TODO: This file contains a lot of cut and paste code, and needs | |
76 | * to be cleaned up a bit. The idea is to factor out the common checks | |
77 | * but not introduce any IsOper/IsUser/MyUser/IsServer etc. stuff. | |
78 | */ | |
79 | ||
80 | /** Relay a local user's message to a channel. | |
81 | * Generates an error if the client cannot send to the channel. | |
82 | * @param[in] sptr Client that originated the message. | |
83 | * @param[in] name Name of target channel. | |
84 | * @param[in] text %Message to relay. | |
85 | */ | |
86 | void relay_channel_message(struct Client* sptr, const char* name, const char* text) | |
87 | { | |
88 | struct Channel* chptr; | |
89 | assert(0 != sptr); | |
90 | assert(0 != name); | |
91 | assert(0 != text); | |
92 | ||
93 | if (0 == (chptr = FindChannel(name))) { | |
94 | send_reply(sptr, ERR_NOSUCHCHANNEL, name); | |
95 | return; | |
96 | } | |
97 | /* | |
98 | * This first: Almost never a server/service | |
99 | */ | |
100 | if (!client_can_send_to_channel(sptr, chptr, 1)) { | |
101 | send_reply(sptr, ERR_CANNOTSENDTOCHAN, chptr->chname); | |
102 | return; | |
103 | } | |
104 | if ((chptr->mode.mode & MODE_NOPRIVMSGS) && | |
105 | check_target_limit(sptr, chptr, chptr->chname, 0)) | |
106 | return; | |
107 | ||
108 | sendcmdto_channel_butone(sptr, CMD_PRIVATE, chptr, cli_from(sptr), | |
109 | SKIP_DEAF | SKIP_BURST, "%H :%s", chptr, text); | |
110 | } | |
111 | ||
112 | /** Relay a local user's notice to a channel. | |
113 | * Silently exits if the client cannot send to the channel. | |
114 | * @param[in] sptr Client that originated the message. | |
115 | * @param[in] name Name of target channel. | |
116 | * @param[in] text %Message to relay. | |
117 | */ | |
118 | void relay_channel_notice(struct Client* sptr, const char* name, const char* text) | |
119 | { | |
120 | struct Channel* chptr; | |
121 | assert(0 != sptr); | |
122 | assert(0 != name); | |
123 | assert(0 != text); | |
124 | ||
125 | if (0 == (chptr = FindChannel(name))) | |
126 | return; | |
127 | /* | |
128 | * This first: Almost never a server/service | |
129 | */ | |
130 | if (!client_can_send_to_channel(sptr, chptr, 1)) | |
131 | return; | |
132 | ||
133 | if ((chptr->mode.mode & MODE_NOPRIVMSGS) && | |
134 | check_target_limit(sptr, chptr, chptr->chname, 0)) | |
135 | return; | |
136 | ||
137 | sendcmdto_channel_butone(sptr, CMD_NOTICE, chptr, cli_from(sptr), | |
138 | SKIP_DEAF | SKIP_BURST, "%H :%s", chptr, text); | |
139 | } | |
140 | ||
141 | /** Relay a message to a channel. | |
142 | * Generates an error if the client cannot send to the channel, | |
143 | * or if the channel is a local channel | |
144 | * @param[in] sptr Client that originated the message. | |
145 | * @param[in] name Name of target channel. | |
146 | * @param[in] text %Message to relay. | |
147 | */ | |
148 | void server_relay_channel_message(struct Client* sptr, const char* name, const char* text) | |
149 | { | |
150 | struct Channel* chptr; | |
151 | assert(0 != sptr); | |
152 | assert(0 != name); | |
153 | assert(0 != text); | |
154 | ||
155 | if (IsLocalChannel(name) || 0 == (chptr = FindChannel(name))) { | |
156 | send_reply(sptr, ERR_NOSUCHCHANNEL, name); | |
157 | return; | |
158 | } | |
159 | /* | |
160 | * This first: Almost never a server/service | |
161 | * Servers may have channel services, need to check for it here | |
162 | */ | |
163 | if (client_can_send_to_channel(sptr, chptr, 1) || IsChannelService(sptr)) { | |
164 | sendcmdto_channel_butone(sptr, CMD_PRIVATE, chptr, cli_from(sptr), | |
165 | SKIP_DEAF | SKIP_BURST, "%H :%s", chptr, text); | |
166 | } | |
167 | else | |
168 | send_reply(sptr, ERR_CANNOTSENDTOCHAN, chptr->chname); | |
169 | } | |
170 | ||
171 | /** Relay a notice to a channel. | |
172 | * Generates an error if the client cannot send to the channel, | |
173 | * or if the channel is a local channel | |
174 | * @param[in] sptr Client that originated the message. | |
175 | * @param[in] name Name of target channel. | |
176 | * @param[in] text %Message to relay. | |
177 | */ | |
178 | void server_relay_channel_notice(struct Client* sptr, const char* name, const char* text) | |
179 | { | |
180 | struct Channel* chptr; | |
181 | assert(0 != sptr); | |
182 | assert(0 != name); | |
183 | assert(0 != text); | |
184 | ||
185 | if (IsLocalChannel(name) || 0 == (chptr = FindChannel(name))) | |
186 | return; | |
187 | /* | |
188 | * This first: Almost never a server/service | |
189 | * Servers may have channel services, need to check for it here | |
190 | */ | |
191 | if (client_can_send_to_channel(sptr, chptr, 1) || IsChannelService(sptr)) { | |
192 | sendcmdto_channel_butone(sptr, CMD_NOTICE, chptr, cli_from(sptr), | |
193 | SKIP_DEAF | SKIP_BURST, "%H :%s", chptr, text); | |
194 | } | |
195 | } | |
196 | ||
197 | /** Relay a directed message. | |
198 | * Generates an error if the named server does not exist, if it is not | |
199 | * a services server, or if \a name names a local user and a hostmask | |
200 | * is specified but does not match. | |
201 | * @param[in] sptr Client that originated the message. | |
202 | * @param[in] name Target nickname, with optional "%hostname" suffix. | |
203 | * @param[in] server Name of target server. | |
204 | * @param[in] text %Message to relay. | |
205 | */ | |
206 | void relay_directed_message(struct Client* sptr, char* name, char* server, const char* text) | |
207 | { | |
208 | struct Client* acptr; | |
209 | char* host; | |
210 | ||
211 | assert(0 != sptr); | |
212 | assert(0 != name); | |
213 | assert(0 != text); | |
214 | assert(0 != server); | |
215 | ||
216 | if ((acptr = FindServer(server + 1)) == NULL || !IsService(acptr)) | |
217 | { | |
218 | send_reply(sptr, ERR_NOSUCHNICK, name); | |
219 | return; | |
220 | } | |
221 | /* | |
222 | * NICK[%host]@server addressed? See if <server> is me first | |
223 | */ | |
224 | if (!IsMe(acptr)) | |
225 | { | |
226 | sendcmdto_one(sptr, CMD_PRIVATE, acptr, "%s :%s", name, text); | |
227 | return; | |
228 | } | |
229 | /* | |
230 | * Look for an user whose NICK is equal to <name> and then | |
231 | * check if it's hostname matches <host> and if it's a local | |
232 | * user. | |
233 | */ | |
234 | *server = '\0'; | |
235 | if ((host = strchr(name, '%'))) | |
236 | *host++ = '\0'; | |
237 | ||
238 | /* As reported by Vampire-, it's possible to brute force finding users | |
239 | * by sending a message to each server and see which one succeeded. | |
240 | * This means we have to remove error reporting. Sigh. Better than | |
241 | * removing the ability to send directed messages to client servers | |
242 | * Thanks for the suggestion Vampire=. -- Isomer 2001-08-28 | |
243 | * Argh, /ping nick@server, disallow messages to non +k clients :/ I hate | |
244 | * this. -- Isomer 2001-09-16 | |
245 | */ | |
246 | if (!(acptr = FindUser(name)) || !MyUser(acptr) || | |
247 | (!EmptyString(host) && 0 != match(host, cli_user(acptr)->host)) || | |
248 | !IsChannelService(acptr)) | |
249 | { | |
250 | /* | |
251 | * By this stage we might as well not bother because they will | |
252 | * know that this server is currently linked because of the | |
253 | * increased lag. | |
254 | */ | |
255 | send_reply(sptr, ERR_NOSUCHNICK, name); | |
256 | return; | |
257 | } | |
258 | ||
259 | *server = '@'; | |
260 | if (host) | |
261 | *--host = '%'; | |
262 | ||
263 | if (!(is_silenced(sptr, acptr))) | |
264 | sendcmdto_one(sptr, CMD_PRIVATE, acptr, "%s :%s", name, text); | |
265 | } | |
266 | ||
267 | /** Relay a directed notice. | |
268 | * Generates an error if the named server does not exist, if it is not | |
269 | * a services server, or if \a name names a local user and a hostmask | |
270 | * is specified but does not match. | |
271 | * @param[in] sptr Client that originated the message. | |
272 | * @param[in] name Target nickname, with optional "%hostname" suffix. | |
273 | * @param[in] server Name of target server. | |
274 | * @param[in] text %Message to relay. | |
275 | */ | |
276 | void relay_directed_notice(struct Client* sptr, char* name, char* server, const char* text) | |
277 | { | |
278 | struct Client* acptr; | |
279 | char* host; | |
280 | ||
281 | assert(0 != sptr); | |
282 | assert(0 != name); | |
283 | assert(0 != text); | |
284 | assert(0 != server); | |
285 | ||
286 | if (0 == (acptr = FindServer(server + 1))) | |
287 | return; | |
288 | /* | |
289 | * NICK[%host]@server addressed? See if <server> is me first | |
290 | */ | |
291 | if (!IsMe(acptr)) { | |
292 | sendcmdto_one(sptr, CMD_NOTICE, acptr, "%s :%s", name, text); | |
293 | return; | |
294 | } | |
295 | /* | |
296 | * Look for an user whose NICK is equal to <name> and then | |
297 | * check if it's hostname matches <host> and if it's a local | |
298 | * user. | |
299 | */ | |
300 | *server = '\0'; | |
301 | if ((host = strchr(name, '%'))) | |
302 | *host++ = '\0'; | |
303 | ||
304 | if (!(acptr = FindUser(name)) || !MyUser(acptr) || | |
305 | (!EmptyString(host) && 0 != match(host, cli_user(acptr)->host))) | |
306 | return; | |
307 | ||
308 | *server = '@'; | |
309 | if (host) | |
310 | *--host = '%'; | |
311 | ||
312 | if (!(is_silenced(sptr, acptr))) | |
313 | sendcmdto_one(sptr, CMD_NOTICE, acptr, "%s :%s", name, text); | |
314 | } | |
315 | ||
316 | /** Relay a private message from a local user. | |
317 | * Returns an error if the user does not exist or sending to him would | |
318 | * exceed the source's free targets. Sends an AWAY status message if | |
319 | * the target is marked as away. | |
320 | * @param[in] sptr Client that originated the message. | |
321 | * @param[in] name Nickname of target user. | |
322 | * @param[in] text %Message to relay. | |
323 | */ | |
324 | void relay_private_message(struct Client* sptr, const char* name, const char* text) | |
325 | { | |
326 | struct Client* acptr; | |
327 | ||
328 | assert(0 != sptr); | |
329 | assert(0 != name); | |
330 | assert(0 != text); | |
331 | ||
332 | if (0 == (acptr = FindUser(name))) { | |
333 | send_reply(sptr, ERR_NOSUCHNICK, name); | |
334 | return; | |
335 | } | |
336 | if ((!IsChannelService(acptr) && | |
337 | check_target_limit(sptr, acptr, cli_name(acptr), 0)) || | |
338 | is_silenced(sptr, acptr)) | |
339 | return; | |
340 | ||
341 | /* | |
342 | * send away message if user away | |
343 | */ | |
344 | if (cli_user(acptr) && cli_user(acptr)->away) | |
345 | send_reply(sptr, RPL_AWAY, cli_name(acptr), cli_user(acptr)->away); | |
346 | /* | |
347 | * deliver the message | |
348 | */ | |
349 | if (MyUser(acptr)) | |
350 | add_target(acptr, sptr); | |
351 | ||
352 | sendcmdto_one(sptr, CMD_PRIVATE, acptr, "%C :%s", acptr, text); | |
353 | } | |
354 | ||
355 | /** Relay a private notice from a local user. | |
356 | * Returns an error if the user does not exist or sending to him would | |
357 | * exceed the source's free targets. Sends an AWAY status message if | |
358 | * the target is marked as away. | |
359 | * @param[in] sptr Client that originated the message. | |
360 | * @param[in] name Nickname of target user. | |
361 | * @param[in] text %Message to relay. | |
362 | */ | |
363 | void relay_private_notice(struct Client* sptr, const char* name, const char* text) | |
364 | { | |
365 | struct Client* acptr; | |
366 | assert(0 != sptr); | |
367 | assert(0 != name); | |
368 | assert(0 != text); | |
369 | ||
370 | if (0 == (acptr = FindUser(name))) | |
371 | return; | |
372 | if ((!IsChannelService(acptr) && | |
373 | check_target_limit(sptr, acptr, cli_name(acptr), 0)) || | |
374 | is_silenced(sptr, acptr)) | |
375 | return; | |
376 | /* | |
377 | * deliver the message | |
378 | */ | |
379 | if (MyUser(acptr)) | |
380 | add_target(acptr, sptr); | |
381 | ||
382 | sendcmdto_one(sptr, CMD_NOTICE, acptr, "%C :%s", acptr, text); | |
383 | } | |
384 | ||
385 | /** Relay a private message that arrived from a server. | |
386 | * Returns an error if the user does not exist. | |
387 | * @param[in] sptr Client that originated the message. | |
388 | * @param[in] name Nickname of target user. | |
389 | * @param[in] text %Message to relay. | |
390 | */ | |
391 | void server_relay_private_message(struct Client* sptr, const char* name, const char* text) | |
392 | { | |
393 | struct Client* acptr; | |
394 | assert(0 != sptr); | |
395 | assert(0 != name); | |
396 | assert(0 != text); | |
397 | /* | |
398 | * nickname addressed? | |
399 | */ | |
400 | if (0 == (acptr = findNUser(name)) || !IsUser(acptr)) { | |
401 | send_reply(sptr, SND_EXPLICIT | ERR_NOSUCHNICK, "* :Target left %s. " | |
402 | "Failed to deliver: [%.20s]", feature_str(FEAT_NETWORK), | |
403 | text); | |
404 | return; | |
405 | } | |
406 | if (is_silenced(sptr, acptr)) | |
407 | return; | |
408 | ||
409 | if (MyUser(acptr)) | |
410 | add_target(acptr, sptr); | |
411 | ||
412 | sendcmdto_one(sptr, CMD_PRIVATE, acptr, "%C :%s", acptr, text); | |
413 | } | |
414 | ||
415 | ||
416 | /** Relay a private notice that arrived from a server. | |
417 | * Returns an error if the user does not exist. | |
418 | * @param[in] sptr Client that originated the message. | |
419 | * @param[in] name Nickname of target user. | |
420 | * @param[in] text %Message to relay. | |
421 | */ | |
422 | void server_relay_private_notice(struct Client* sptr, const char* name, const char* text) | |
423 | { | |
424 | struct Client* acptr; | |
425 | assert(0 != sptr); | |
426 | assert(0 != name); | |
427 | assert(0 != text); | |
428 | /* | |
429 | * nickname addressed? | |
430 | */ | |
431 | if (0 == (acptr = findNUser(name)) || !IsUser(acptr)) | |
432 | return; | |
433 | ||
434 | if (is_silenced(sptr, acptr)) | |
435 | return; | |
436 | ||
437 | if (MyUser(acptr)) | |
438 | add_target(acptr, sptr); | |
439 | ||
440 | sendcmdto_one(sptr, CMD_NOTICE, acptr, "%C :%s", acptr, text); | |
441 | } | |
442 | ||
443 | /** Relay a masked message from a local user. | |
444 | * Sends an error response if there is no top-level domain label in \a | |
445 | * mask, or if that TLD contains a wildcard. | |
446 | * @param[in] sptr Client that originated the message. | |
447 | * @param[in] mask Target mask for the message. | |
448 | * @param[in] text %Message to relay. | |
449 | */ | |
450 | void relay_masked_message(struct Client* sptr, const char* mask, const char* text) | |
451 | { | |
452 | const char* s; | |
453 | int host_mask = 0; | |
454 | ||
455 | assert(0 != sptr); | |
456 | assert(0 != mask); | |
457 | assert(0 != text); | |
458 | /* | |
459 | * look for the last '.' in mask and scan forward | |
460 | */ | |
461 | if (0 == (s = strrchr(mask, '.'))) { | |
462 | send_reply(sptr, ERR_NOTOPLEVEL, mask); | |
463 | return; | |
464 | } | |
465 | while (*++s) { | |
466 | if (*s == '.' || *s == '*' || *s == '?') | |
467 | break; | |
468 | } | |
469 | if (*s == '*' || *s == '?') { | |
470 | send_reply(sptr, ERR_WILDTOPLEVEL, mask); | |
471 | return; | |
472 | } | |
473 | s = mask; | |
474 | if ('@' == *++s) { | |
475 | host_mask = 1; | |
476 | ++s; | |
477 | } | |
478 | ||
479 | sendcmdto_match_butone(sptr, CMD_PRIVATE, s, | |
480 | IsServer(cli_from(sptr)) ? cli_from(sptr) : 0, | |
481 | host_mask ? MATCH_HOST : MATCH_SERVER, | |
482 | "%s :%s", mask, text); | |
483 | } | |
484 | ||
485 | /** Relay a masked notice from a local user. | |
486 | * Sends an error response if there is no top-level domain label in \a | |
487 | * mask, or if that TLD contains a wildcard. | |
488 | * @param[in] sptr Client that originated the message. | |
489 | * @param[in] mask Target mask for the message. | |
490 | * @param[in] text %Message to relay. | |
491 | */ | |
492 | void relay_masked_notice(struct Client* sptr, const char* mask, const char* text) | |
493 | { | |
494 | const char* s; | |
495 | int host_mask = 0; | |
496 | ||
497 | assert(0 != sptr); | |
498 | assert(0 != mask); | |
499 | assert(0 != text); | |
500 | /* | |
501 | * look for the last '.' in mask and scan forward | |
502 | */ | |
503 | if (0 == (s = strrchr(mask, '.'))) { | |
504 | send_reply(sptr, ERR_NOTOPLEVEL, mask); | |
505 | return; | |
506 | } | |
507 | while (*++s) { | |
508 | if (*s == '.' || *s == '*' || *s == '?') | |
509 | break; | |
510 | } | |
511 | if (*s == '*' || *s == '?') { | |
512 | send_reply(sptr, ERR_WILDTOPLEVEL, mask); | |
513 | return; | |
514 | } | |
515 | s = mask; | |
516 | if ('@' == *++s) { | |
517 | host_mask = 1; | |
518 | ++s; | |
519 | } | |
520 | ||
521 | sendcmdto_match_butone(sptr, CMD_NOTICE, s, | |
522 | IsServer(cli_from(sptr)) ? cli_from(sptr) : 0, | |
523 | host_mask ? MATCH_HOST : MATCH_SERVER, | |
524 | "%s :%s", mask, text); | |
525 | } | |
526 | ||
527 | /** Relay a masked message that arrived from a server. | |
528 | * @param[in] sptr Client that originated the message. | |
529 | * @param[in] mask Target mask for the message. | |
530 | * @param[in] text %Message to relay. | |
531 | */ | |
532 | void server_relay_masked_message(struct Client* sptr, const char* mask, const char* text) | |
533 | { | |
534 | const char* s = mask; | |
535 | int host_mask = 0; | |
536 | assert(0 != sptr); | |
537 | assert(0 != mask); | |
538 | assert(0 != text); | |
539 | ||
540 | if ('@' == *++s) { | |
541 | host_mask = 1; | |
542 | ++s; | |
543 | } | |
544 | sendcmdto_match_butone(sptr, CMD_PRIVATE, s, | |
545 | IsServer(cli_from(sptr)) ? cli_from(sptr) : 0, | |
546 | host_mask ? MATCH_HOST : MATCH_SERVER, | |
547 | "%s :%s", mask, text); | |
548 | } | |
549 | ||
550 | /** Relay a masked notice that arrived from a server. | |
551 | * @param[in] sptr Client that originated the message. | |
552 | * @param[in] mask Target mask for the message. | |
553 | * @param[in] text %Message to relay. | |
554 | */ | |
555 | void server_relay_masked_notice(struct Client* sptr, const char* mask, const char* text) | |
556 | { | |
557 | const char* s = mask; | |
558 | int host_mask = 0; | |
559 | assert(0 != sptr); | |
560 | assert(0 != mask); | |
561 | assert(0 != text); | |
562 | ||
563 | if ('@' == *++s) { | |
564 | host_mask = 1; | |
565 | ++s; | |
566 | } | |
567 | sendcmdto_match_butone(sptr, CMD_NOTICE, s, | |
568 | IsServer(cli_from(sptr)) ? cli_from(sptr) : 0, | |
569 | host_mask ? MATCH_HOST : MATCH_SERVER, | |
570 | "%s :%s", mask, text); | |
571 | } | |
572 |