]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * charybdis: an advanced ircd. | |
3 | * parse.c: The message parser. | |
4 | * | |
5 | * Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center | |
6 | * Copyright (C) 1996-2002 Hybrid Development Team | |
7 | * Copyright (C) 2002-2005 ircd-ratbox development team | |
8 | * Copyright (C) 2007-2016 William Pitcock | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
23 | * USA | |
24 | */ | |
25 | ||
26 | #include "stdinc.h" | |
27 | #include "parse.h" | |
28 | #include "client.h" | |
29 | #include "channel.h" | |
30 | #include "common.h" | |
31 | #include "hash.h" | |
32 | #include "match.h" | |
33 | #include "ircd.h" | |
34 | #include "numeric.h" | |
35 | #include "logger.h" | |
36 | #include "s_stats.h" | |
37 | #include "send.h" | |
38 | #include "msg.h" | |
39 | #include "msgbuf.h" | |
40 | #include "s_conf.h" | |
41 | #include "s_serv.h" | |
42 | #include "packet.h" | |
43 | #include "s_assert.h" | |
44 | ||
45 | struct Dictionary *cmd_dict = NULL; | |
46 | struct Dictionary *alias_dict = NULL; | |
47 | ||
48 | static void cancel_clients(struct Client *, struct Client *); | |
49 | static void remove_unknown(struct Client *, const char *, char *); | |
50 | ||
51 | static void do_numeric(int, struct Client *, struct Client *, int, const char **); | |
52 | static void do_alias(struct alias_entry *, struct Client *, char *); | |
53 | ||
54 | static int handle_command(struct Message *, struct MsgBuf *, struct Client *, struct Client *); | |
55 | ||
56 | static char buffer[1024]; | |
57 | ||
58 | /* turn a string into a parc/parv pair */ | |
59 | ||
60 | char *reconstruct_parv(int parc, const char *parv[]) | |
61 | { | |
62 | static char tmpbuf[BUFSIZE]; int i; | |
63 | ||
64 | rb_strlcpy(tmpbuf, parv[0], BUFSIZE); | |
65 | for (i = 1; i < parc; i++) | |
66 | { | |
67 | rb_strlcat(tmpbuf, " ", BUFSIZE); | |
68 | rb_strlcat(tmpbuf, parv[i], BUFSIZE); | |
69 | } | |
70 | return tmpbuf; | |
71 | } | |
72 | ||
73 | /* parse() | |
74 | * | |
75 | * given a raw buffer, parses it and generates parv and parc | |
76 | */ | |
77 | void | |
78 | parse(struct Client *client_p, char *pbuffer, char *bufend) | |
79 | { | |
80 | struct Client *from = client_p; | |
81 | char *end; | |
82 | int res; | |
83 | int numeric = 0; | |
84 | struct Message *mptr; | |
85 | struct MsgBuf msgbuf; | |
86 | ||
87 | s_assert(MyConnect(client_p)); | |
88 | s_assert(client_p->localClient->F != NULL); | |
89 | if(IsAnyDead(client_p)) | |
90 | return; | |
91 | ||
92 | end = bufend - 1; | |
93 | ||
94 | /* XXX this should be done before parse() is called */ | |
95 | if(*end == '\n') | |
96 | *end-- = '\0'; | |
97 | if(*end == '\r') | |
98 | *end = '\0'; | |
99 | ||
100 | res = msgbuf_parse(&msgbuf, pbuffer); | |
101 | if (res) | |
102 | { | |
103 | ServerStats.is_empt++; | |
104 | return; | |
105 | } | |
106 | ||
107 | if (msgbuf.origin != NULL && IsServer(client_p)) | |
108 | { | |
109 | from = find_client(msgbuf.origin); | |
110 | ||
111 | /* didnt find any matching client, issue a kill */ | |
112 | if(from == NULL) | |
113 | { | |
114 | ServerStats.is_unpf++; | |
115 | remove_unknown(client_p, msgbuf.origin, pbuffer); | |
116 | return; | |
117 | } | |
118 | ||
119 | /* fake direction, hmm. */ | |
120 | if(from->from != client_p) | |
121 | { | |
122 | ServerStats.is_wrdi++; | |
123 | cancel_clients(client_p, from); | |
124 | return; | |
125 | } | |
126 | } | |
127 | ||
128 | if(IsDigit(*msgbuf.cmd) && IsDigit(*(msgbuf.cmd + 1)) && IsDigit(*(msgbuf.cmd + 2))) | |
129 | { | |
130 | mptr = NULL; | |
131 | numeric = atoi(msgbuf.cmd); | |
132 | ServerStats.is_num++; | |
133 | } | |
134 | else | |
135 | { | |
136 | mptr = rb_dictionary_retrieve(cmd_dict, msgbuf.cmd); | |
137 | ||
138 | /* no command or its encap only, error */ | |
139 | if(!mptr || !mptr->cmd) | |
140 | { | |
141 | if (IsPerson(client_p)) | |
142 | { | |
143 | struct alias_entry *aptr = rb_dictionary_retrieve(alias_dict, msgbuf.cmd); | |
144 | if (aptr != NULL) | |
145 | { | |
146 | if (msgbuf.n_para < 2) | |
147 | { | |
148 | sendto_one(client_p, form_str(ERR_NEEDMOREPARAMS), | |
149 | me.name, | |
150 | EmptyString(client_p->name) ? "*" : client_p->name, | |
151 | msgbuf.cmd); | |
152 | return; | |
153 | } | |
154 | ||
155 | do_alias(aptr, client_p, reconstruct_parv(msgbuf.n_para - 1, msgbuf.para + 1)); | |
156 | return; | |
157 | } | |
158 | } | |
159 | if(IsPerson(from)) | |
160 | { | |
161 | sendto_one(from, form_str(ERR_UNKNOWNCOMMAND), | |
162 | me.name, from->name, msgbuf.cmd); | |
163 | } | |
164 | ServerStats.is_unco++; | |
165 | return; | |
166 | } | |
167 | ||
168 | mptr->bytes += msgbuf.parselen; | |
169 | } | |
170 | ||
171 | if(mptr == NULL) | |
172 | { | |
173 | do_numeric(numeric, client_p, from, msgbuf.n_para, msgbuf.para); | |
174 | return; | |
175 | } | |
176 | ||
177 | if(handle_command(mptr, &msgbuf, client_p, from) < -1) | |
178 | { | |
179 | char *p; | |
180 | for (p = pbuffer; p <= end; p += 8) | |
181 | { | |
182 | /* HACK HACK */ | |
183 | /* Its expected this nasty code can be removed | |
184 | * or rewritten later if still needed. | |
185 | */ | |
186 | if((p + 8) > end) | |
187 | { | |
188 | for (; p <= end; p++) | |
189 | { | |
190 | ilog(L_MAIN, "%02x |%c", p[0], p[0]); | |
191 | } | |
192 | } | |
193 | else | |
194 | ilog(L_MAIN, | |
195 | "%02x %02x %02x %02x %02x %02x %02x %02x |%c%c%c%c%c%c%c%c", | |
196 | p[0], p[1], p[2], p[3], p[4], p[5], | |
197 | p[6], p[7], p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]); | |
198 | } | |
199 | } | |
200 | ||
201 | } | |
202 | ||
203 | /* | |
204 | * handle_command | |
205 | * | |
206 | * inputs - pointer to message block | |
207 | * - pointer to message buffer | |
208 | * - pointer to client | |
209 | * - pointer to client message is from | |
210 | * output - -1 if error from server | |
211 | * side effects - | |
212 | */ | |
213 | static int | |
214 | handle_command(struct Message *mptr, struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *from) | |
215 | { | |
216 | struct MessageEntry ehandler; | |
217 | MessageHandler handler = 0; | |
218 | char squitreason[80]; | |
219 | ||
220 | if(IsAnyDead(client_p)) | |
221 | return -1; | |
222 | ||
223 | if(IsServer(client_p)) | |
224 | mptr->rcount++; | |
225 | ||
226 | mptr->count++; | |
227 | ||
228 | ehandler = mptr->handlers[from->handler]; | |
229 | handler = ehandler.handler; | |
230 | ||
231 | /* check right amount of params is passed... --is */ | |
232 | if(msgbuf_p->n_para < ehandler.min_para || | |
233 | (ehandler.min_para && EmptyString(msgbuf_p->para[ehandler.min_para - 1]))) | |
234 | { | |
235 | if(!IsServer(client_p)) | |
236 | { | |
237 | sendto_one(client_p, form_str(ERR_NEEDMOREPARAMS), | |
238 | me.name, | |
239 | EmptyString(client_p->name) ? "*" : client_p->name, | |
240 | mptr->cmd); | |
241 | if(MyClient(client_p)) | |
242 | return (1); | |
243 | else | |
244 | return (-1); | |
245 | } | |
246 | ||
247 | sendto_realops_snomask(SNO_GENERAL, L_ALL, | |
248 | "Dropping server %s due to (invalid) command '%s'" | |
249 | " with only %zu arguments (expecting %zu).", | |
250 | client_p->name, mptr->cmd, msgbuf_p->n_para, ehandler.min_para); | |
251 | ilog(L_SERVER, | |
252 | "Insufficient parameters (%zu < %zu) for command '%s' from %s.", | |
253 | msgbuf_p->n_para, ehandler.min_para, mptr->cmd, client_p->name); | |
254 | snprintf(squitreason, sizeof squitreason, | |
255 | "Insufficient parameters (%zu < %zu) for command '%s'", | |
256 | msgbuf_p->n_para, ehandler.min_para, mptr->cmd); | |
257 | exit_client(client_p, client_p, client_p, squitreason); | |
258 | return (-1); | |
259 | } | |
260 | ||
261 | (*handler) (msgbuf_p, client_p, from, msgbuf_p->n_para, msgbuf_p->para); | |
262 | return (1); | |
263 | } | |
264 | ||
265 | void | |
266 | handle_encap(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, | |
267 | const char *command, int parc, const char *parv[]) | |
268 | { | |
269 | struct Message *mptr; | |
270 | struct MessageEntry ehandler; | |
271 | MessageHandler handler = 0; | |
272 | ||
273 | mptr = rb_dictionary_retrieve(cmd_dict, command); | |
274 | ||
275 | if(mptr == NULL || mptr->cmd == NULL) | |
276 | return; | |
277 | ||
278 | ehandler = mptr->handlers[ENCAP_HANDLER]; | |
279 | handler = ehandler.handler; | |
280 | ||
281 | if((size_t)parc < ehandler.min_para || | |
282 | (ehandler.min_para && EmptyString(parv[ehandler.min_para - 1]))) | |
283 | return; | |
284 | ||
285 | (*handler) (msgbuf_p, client_p, source_p, parc, parv); | |
286 | } | |
287 | ||
288 | /* | |
289 | * clear_hash_parse() | |
290 | * | |
291 | * inputs - | |
292 | * output - NONE | |
293 | * side effects - MUST MUST be called at startup ONCE before | |
294 | * any other keyword hash routine is used. | |
295 | */ | |
296 | void | |
297 | clear_hash_parse() | |
298 | { | |
299 | cmd_dict = rb_dictionary_create("command", strcasecmp); | |
300 | } | |
301 | ||
302 | /* mod_add_cmd | |
303 | * | |
304 | * inputs - command name | |
305 | * - pointer to struct Message | |
306 | * output - none | |
307 | * side effects - load this one command name | |
308 | * msg->count msg->bytes is modified in place, in | |
309 | * modules address space. Might not want to do that... | |
310 | */ | |
311 | void | |
312 | mod_add_cmd(struct Message *msg) | |
313 | { | |
314 | s_assert(msg != NULL); | |
315 | if(msg == NULL) | |
316 | return; | |
317 | ||
318 | if (rb_dictionary_find(cmd_dict, msg->cmd) != NULL) | |
319 | return; | |
320 | ||
321 | msg->count = 0; | |
322 | msg->rcount = 0; | |
323 | msg->bytes = 0; | |
324 | ||
325 | rb_dictionary_add(cmd_dict, msg->cmd, msg); | |
326 | } | |
327 | ||
328 | /* mod_del_cmd | |
329 | * | |
330 | * inputs - command name | |
331 | * output - none | |
332 | * side effects - unload this one command name | |
333 | */ | |
334 | void | |
335 | mod_del_cmd(struct Message *msg) | |
336 | { | |
337 | s_assert(msg != NULL); | |
338 | if(msg == NULL) | |
339 | return; | |
340 | ||
341 | rb_dictionary_delete(cmd_dict, msg->cmd); | |
342 | } | |
343 | ||
344 | /* cancel_clients() | |
345 | * | |
346 | * inputs - client who sent us the message, client with fake | |
347 | * direction | |
348 | * outputs - a given warning about the fake direction | |
349 | * side effects - | |
350 | */ | |
351 | static void | |
352 | cancel_clients(struct Client *client_p, struct Client *source_p) | |
353 | { | |
354 | /* ok, fake prefix happens naturally during a burst on a nick | |
355 | * collision with TS5, we cant kill them because one client has to | |
356 | * survive, so we just send an error. | |
357 | */ | |
358 | if(IsServer(source_p) || IsMe(source_p)) | |
359 | { | |
360 | sendto_realops_snomask(SNO_DEBUG, L_ALL, | |
361 | "Message for %s[%s] from %s", | |
362 | source_p->name, source_p->from->name, | |
363 | client_p->name); | |
364 | } | |
365 | else | |
366 | { | |
367 | sendto_realops_snomask(SNO_DEBUG, L_ALL, | |
368 | "Message for %s[%s@%s!%s] from %s (TS, ignored)", | |
369 | source_p->name, | |
370 | source_p->username, | |
371 | source_p->host, | |
372 | source_p->from->name, | |
373 | client_p->name); | |
374 | } | |
375 | } | |
376 | ||
377 | /* remove_unknown() | |
378 | * | |
379 | * inputs - client who gave us message, supposed sender, buffer | |
380 | * output - | |
381 | * side effects - kills issued for clients, squits for servers | |
382 | */ | |
383 | static void | |
384 | remove_unknown(struct Client *client_p, const char *lsender, char *lbuffer) | |
385 | { | |
386 | int slen = strlen(lsender); | |
387 | char sid[4]; | |
388 | struct Client *server; | |
389 | ||
390 | /* meepfoo is a nickname (ignore) | |
391 | * #XXXXXXXX is a UID (KILL) | |
392 | * #XX is a SID (SQUIT) | |
393 | * meep.foo is a server (SQUIT) | |
394 | */ | |
395 | if((IsDigit(lsender[0]) && slen == 3) || | |
396 | (strchr(lsender, '.') != NULL)) | |
397 | { | |
398 | sendto_realops_snomask(SNO_DEBUG, L_ALL, | |
399 | "Unknown prefix (%s) from %s, Squitting %s", | |
400 | lbuffer, client_p->name, lsender); | |
401 | ||
402 | sendto_one(client_p, | |
403 | ":%s SQUIT %s :(Unknown prefix (%s) from %s)", | |
404 | get_id(&me, client_p), lsender, | |
405 | lbuffer, client_p->name); | |
406 | } | |
407 | else if(!IsDigit(lsender[0])) | |
408 | ; | |
409 | else if(slen != 9) | |
410 | sendto_realops_snomask(SNO_DEBUG, L_ALL, | |
411 | "Invalid prefix (%s) from %s", | |
412 | lbuffer, client_p->name); | |
413 | else | |
414 | { | |
415 | memcpy(sid, lsender, 3); | |
416 | sid[3] = '\0'; | |
417 | server = find_server(NULL, sid); | |
418 | if (server != NULL && server->from == client_p) | |
419 | sendto_one(client_p, ":%s KILL %s :%s (Unknown Client)", | |
420 | get_id(&me, client_p), lsender, me.name); | |
421 | } | |
422 | } | |
423 | ||
424 | ||
425 | ||
426 | /* | |
427 | * | |
428 | * parc number of arguments ('sender' counted as one!) | |
429 | * parv[1]..parv[parc-1] | |
430 | * pointers to additional parameters, this is a NULL | |
431 | * terminated list (parv[parc] == NULL). | |
432 | * | |
433 | * *WARNING* | |
434 | * Numerics are mostly error reports. If there is something | |
435 | * wrong with the message, just *DROP* it! Don't even think of | |
436 | * sending back a neat error message -- big danger of creating | |
437 | * a ping pong error message... | |
438 | */ | |
439 | static void | |
440 | do_numeric(int numeric, struct Client *client_p, struct Client *source_p, int parc, const char *parv[]) | |
441 | { | |
442 | struct Client *target_p; | |
443 | struct Channel *chptr; | |
444 | ||
445 | if(parc < 2 || !IsServer(source_p)) | |
446 | return; | |
447 | ||
448 | /* Remap low number numerics. */ | |
449 | if(numeric < 100) | |
450 | numeric += 100; | |
451 | ||
452 | /* | |
453 | * Prepare the parameter portion of the message into 'buffer'. | |
454 | * (Because the buffer is twice as large as the message buffer | |
455 | * for the socket, no overflow can occur here... ...on current | |
456 | * assumptions--bets are off, if these are changed --msa) | |
457 | * Note: if buffer is non-empty, it will begin with SPACE. | |
458 | */ | |
459 | if(parc > 1) | |
460 | { | |
461 | char *t = buffer; /* Current position within the buffer */ | |
462 | int i; | |
463 | int tl; /* current length of presently being built string in t */ | |
464 | for (i = 2; i < (parc - 1); i++) | |
465 | { | |
466 | tl = sprintf(t, " %s", parv[i]); | |
467 | t += tl; | |
468 | } | |
469 | sprintf(t, " :%s", parv[parc - 1]); | |
470 | } | |
471 | ||
472 | if((target_p = find_client(parv[1])) != NULL) | |
473 | { | |
474 | if(IsMe(target_p)) | |
475 | { | |
476 | /* | |
477 | * We shouldn't get numerics sent to us, | |
478 | * any numerics we do get indicate a bug somewhere.. | |
479 | */ | |
480 | /* ugh. this is here because of nick collisions. when two servers | |
481 | * relink, they burst each other their nicks, then perform collides. | |
482 | * if there is a nick collision, BOTH servers will kill their own | |
483 | * nicks, and BOTH will kill the other servers nick, which wont exist, | |
484 | * because it will have been already killed by the local server. | |
485 | * | |
486 | * unfortunately, as we cant guarantee other servers will do the | |
487 | * "right thing" on a nick collision, we have to keep both kills. | |
488 | * ergo we need to ignore ERR_NOSUCHNICK. --fl_ | |
489 | */ | |
490 | /* quick comment. This _was_ tried. i.e. assume the other servers | |
491 | * will do the "right thing" and kill a nick that is colliding. | |
492 | * unfortunately, it did not work. --Dianora | |
493 | */ | |
494 | /* note, now we send PING on server connect, we can | |
495 | * also get ERR_NOSUCHSERVER.. | |
496 | */ | |
497 | if(numeric != ERR_NOSUCHNICK && | |
498 | numeric != ERR_NOSUCHSERVER) | |
499 | sendto_realops_snomask(SNO_GENERAL, L_ADMIN, | |
500 | "*** %s(via %s) sent a %03d numeric to me: %s", | |
501 | source_p->name, | |
502 | client_p->name, numeric, buffer); | |
503 | return; | |
504 | } | |
505 | else if(target_p->from == client_p) | |
506 | { | |
507 | /* This message changed direction (nick collision?) | |
508 | * ignore it. | |
509 | */ | |
510 | return; | |
511 | } | |
512 | ||
513 | /* csircd will send out unknown umode flag for +a (admin), drop it here. */ | |
514 | if(numeric == ERR_UMODEUNKNOWNFLAG && MyClient(target_p)) | |
515 | return; | |
516 | ||
517 | /* Fake it for server hiding, if its our client */ | |
518 | sendto_one(target_p, ":%s %03d %s%s", | |
519 | get_id(source_p, target_p), numeric, | |
520 | get_id(target_p, target_p), buffer); | |
521 | return; | |
522 | } | |
523 | else if((chptr = find_channel(parv[1])) != NULL) | |
524 | sendto_channel_flags(client_p, ALL_MEMBERS, source_p, chptr, | |
525 | "%03d %s%s", | |
526 | numeric, chptr->chname, buffer); | |
527 | } | |
528 | ||
529 | static void do_alias(struct alias_entry *aptr, struct Client *source_p, char *text) | |
530 | { | |
531 | char *p; | |
532 | struct Client *target_p; | |
533 | ||
534 | if (!IsFloodDone(source_p) && source_p->localClient->receiveM > 20) | |
535 | flood_endgrace(source_p); | |
536 | ||
537 | p = strchr(aptr->target, '@'); | |
538 | if (p != NULL) | |
539 | { | |
540 | /* user@server */ | |
541 | target_p = find_server(NULL, p + 1); | |
542 | if (target_p != NULL && IsMe(target_p)) | |
543 | target_p = NULL; | |
544 | } | |
545 | else | |
546 | { | |
547 | /* nick, must be +S */ | |
548 | target_p = find_named_person(aptr->target); | |
549 | if (target_p != NULL && !IsService(target_p)) | |
550 | target_p = NULL; | |
551 | } | |
552 | ||
553 | if (target_p == NULL) | |
554 | { | |
555 | sendto_one_numeric(source_p, ERR_SERVICESDOWN, form_str(ERR_SERVICESDOWN), aptr->target); | |
556 | return; | |
557 | } | |
558 | ||
559 | if (text != NULL && *text == ':') | |
560 | text++; | |
561 | if (text == NULL || *text == '\0') | |
562 | { | |
563 | sendto_one(source_p, form_str(ERR_NOTEXTTOSEND), me.name, source_p->name); | |
564 | return; | |
565 | } | |
566 | ||
567 | /* increment the hitcounter on this alias */ | |
568 | aptr->hits++; | |
569 | ||
570 | sendto_one(target_p, ":%s PRIVMSG %s :%s", | |
571 | get_id(source_p, target_p), | |
572 | p != NULL ? aptr->target : get_id(target_p, target_p), | |
573 | text); | |
574 | } | |
575 | ||
576 | void | |
577 | m_not_oper(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[]) | |
578 | { | |
579 | sendto_one_numeric(source_p, ERR_NOPRIVILEGES, form_str(ERR_NOPRIVILEGES)); | |
580 | } | |
581 | ||
582 | void | |
583 | m_unregistered(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[]) | |
584 | { | |
585 | /* bit of a hack. | |
586 | * I don't =really= want to waste a bit in a flag | |
587 | * number_of_nick_changes is only really valid after the client | |
588 | * is fully registered.. | |
589 | */ | |
590 | if(client_p->localClient->number_of_nick_changes == 0) | |
591 | { | |
592 | sendto_one(client_p, form_str(ERR_NOTREGISTERED), me.name); | |
593 | client_p->localClient->number_of_nick_changes++; | |
594 | } | |
595 | } | |
596 | ||
597 | void | |
598 | m_registered(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[]) | |
599 | { | |
600 | sendto_one(client_p, form_str(ERR_ALREADYREGISTRED), me.name, source_p->name); | |
601 | } | |
602 | ||
603 | void | |
604 | m_ignore(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[]) | |
605 | { | |
606 | /* Does nothing */ | |
607 | } |