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