]>
jfr.im git - solanum.git/blob - src/parse.c
2 * charybdis: an advanced ircd.
3 * parse.c: The message parser.
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 William Pitcock
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.
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.
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
25 * $Id: parse.c 3177 2007-02-01 00:19:14Z jilles $
45 static struct Dictionary
*cmd_dict
= NULL
;
46 struct Dictionary
*alias_dict
= NULL
;
49 * NOTE: parse() should not be called recursively by other functions!
53 /* parv[0] is not used, and parv[LAST] == NULL */
54 static char *para
[MAXPARA
+ 2];
56 static void cancel_clients(struct Client
*, struct Client
*, char *);
57 static void remove_unknown(struct Client
*, char *, char *);
59 static void do_numeric(char[], struct Client
*, struct Client
*, int, char **);
60 static void do_alias(struct alias_entry
*, struct Client
*, char *);
62 static int handle_command(struct Message
*, struct Client
*, struct Client
*, int, const char**);
64 static char buffer
[1024];
66 /* turn a string into a parc/parv pair */
70 string_to_array(char *string
, char **parv
)
72 char *p
, *buf
= string
;
76 while (*buf
== ' ') /* skip leading spaces */
78 if(*buf
== '\0') /* ignore all-space args */
83 if(*buf
== ':') /* Last parameter */
94 if((p
= strchr(buf
, ' ')) != NULL
)
107 /* we can go upto parv[MAXPARA], as parv[0] is skipped */
120 * given a raw buffer, parses it and generates parv, parc and sender
123 parse(struct Client
*client_p
, char *pbuffer
, char *bufend
)
125 struct Client
*from
= client_p
;
131 struct Message
*mptr
;
133 s_assert(MyConnect(client_p
));
134 s_assert(client_p
->localClient
->F
!= NULL
);
135 if(IsAnyDead(client_p
))
138 for (ch
= pbuffer
; *ch
== ' '; ch
++) /* skip spaces */
139 /* null statement */ ;
141 para
[0] = from
->name
;
147 /* point sender to the sender param */
150 if((s
= strchr(ch
, ' ')))
157 if(*sender
&& IsServer(client_p
))
159 from
= find_client(sender
);
161 /* didnt find any matching client, issue a kill */
164 ServerStats
.is_unpf
++;
165 remove_unknown(client_p
, sender
, pbuffer
);
169 para
[0] = from
->name
;
171 /* fake direction, hmm. */
172 if(from
->from
!= client_p
)
174 ServerStats
.is_wrdi
++;
175 cancel_clients(client_p
, from
, pbuffer
);
185 ServerStats
.is_empt
++;
189 /* at this point there must be some sort of command parameter */
192 * Extract the command code from the packet. Point s to the end
193 * of the command code and calculate the length using pointer
194 * arithmetic. Note: only need length for numerics and *all*
195 * numerics must have parameters and thus a space after the command
199 /* EOB is 3 chars long but is not a numeric */
201 if(*(ch
+ 3) == ' ' && /* ok, lets see if its a possible numeric.. */
202 IsDigit(*ch
) && IsDigit(*(ch
+ 1)) && IsDigit(*(ch
+ 2)))
206 ServerStats
.is_num
++;
207 s
= ch
+ 3; /* I know this is ' ' from above if */
208 *s
++ = '\0'; /* blow away the ' ', and point s to next part */
214 if((s
= strchr(ch
, ' ')))
217 mptr
= irc_dictionary_retrieve(cmd_dict
, ch
);
219 /* no command or its encap only, error */
220 if(!mptr
|| !mptr
->cmd
)
223 * Note: Give error message *only* to recognized
224 * persons. It's a nightmare situation to have
225 * two programs sending "Unknown command"'s or
226 * equivalent to each other at full blast....
227 * If it has got to person state, it at least
228 * seems to be well behaving. Perhaps this message
229 * should never be generated, though... --msa
230 * Hm, when is the buffer empty -- if a command
231 * code has been found ?? -Armin
233 if(pbuffer
[0] != '\0')
235 if (IsPerson(client_p
))
237 struct alias_entry
*aptr
= irc_dictionary_retrieve(alias_dict
, ch
);
240 do_alias(aptr
, client_p
, s
);
246 sendto_one(from
, form_str(ERR_UNKNOWNCOMMAND
),
247 me
.name
, from
->name
, ch
);
250 ServerStats
.is_unco
++;
254 ii
= bufend
- ((s
) ? s
: ch
);
260 /* XXX this should be done before parse() is called */
267 i
= string_to_array(s
, para
);
271 do_numeric(numeric
, client_p
, from
, i
, para
);
275 if(handle_command(mptr
, client_p
, from
, i
, /* XXX discards const!!! */ (const char **)para
) < -1)
278 for (p
= pbuffer
; p
<= end
; p
+= 8)
281 /* Its expected this nasty code can be removed
282 * or rewritten later if still needed.
284 if((unsigned long) (p
+ 8) > (unsigned long) end
)
286 for (; p
<= end
; p
++)
288 ilog(L_MAIN
, "%02x |%c", p
[0], p
[0]);
293 "%02x %02x %02x %02x %02x %02x %02x %02x |%c%c%c%c%c%c%c%c",
294 p
[0], p
[1], p
[2], p
[3], p
[4], p
[5],
295 p
[6], p
[7], p
[0], p
[1], p
[2], p
[3], p
[4], p
[5], p
[6], p
[7]);
304 * inputs - pointer to message block
305 * - pointer to client
306 * - pointer to client message is from
307 * - count of number of args
308 * - pointer to argv[] array
309 * output - -1 if error from server
313 handle_command(struct Message
*mptr
, struct Client
*client_p
,
314 struct Client
*from
, int i
, const char** hpara
)
316 struct MessageEntry ehandler
;
317 MessageHandler handler
= 0;
318 char squitreason
[80];
320 if(IsAnyDead(client_p
))
323 if(IsServer(client_p
))
328 /* New patch to avoid server flooding from unregistered connects
329 - Pie-Man 07/27/2000 */
331 if(!IsRegistered(client_p
))
333 /* if its from a possible server connection
334 * ignore it.. more than likely its a header thats sneaked through
337 if(IsAnyServer(client_p
) && !(mptr
->flags
& MFLG_UNREG
))
341 ehandler
= mptr
->handlers
[from
->handler
];
342 handler
= ehandler
.handler
;
344 /* check right amount of params is passed... --is */
345 if(i
< ehandler
.min_para
||
346 (ehandler
.min_para
&& EmptyString(hpara
[ehandler
.min_para
- 1])))
348 if(!IsServer(client_p
))
350 sendto_one(client_p
, form_str(ERR_NEEDMOREPARAMS
),
352 EmptyString(client_p
->name
) ? "*" : client_p
->name
,
354 if(MyClient(client_p
))
360 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
361 "Dropping server %s due to (invalid) command '%s'"
362 " with only %d arguments (expecting %d).",
363 client_p
->name
, mptr
->cmd
, i
, ehandler
.min_para
);
365 "Insufficient parameters (%d < %d) for command '%s' from %s.",
366 i
, ehandler
.min_para
, mptr
->cmd
, client_p
->name
);
367 rb_snprintf(squitreason
, sizeof squitreason
,
368 "Insufficient parameters (%d < %d) for command '%s'",
369 i
, ehandler
.min_para
, mptr
->cmd
);
370 exit_client(client_p
, client_p
, client_p
, squitreason
);
374 (*handler
) (client_p
, from
, i
, hpara
);
379 handle_encap(struct Client
*client_p
, struct Client
*source_p
,
380 const char *command
, int parc
, const char *parv
[])
382 struct Message
*mptr
;
383 struct MessageEntry ehandler
;
384 MessageHandler handler
= 0;
386 parv
[0] = source_p
->name
;
388 mptr
= irc_dictionary_retrieve(cmd_dict
, command
);
390 if(mptr
== NULL
|| mptr
->cmd
== NULL
)
393 ehandler
= mptr
->handlers
[ENCAP_HANDLER
];
394 handler
= ehandler
.handler
;
396 if(parc
< ehandler
.min_para
||
397 (ehandler
.min_para
&& EmptyString(parv
[ehandler
.min_para
- 1])))
400 (*handler
) (client_p
, source_p
, parc
, parv
);
408 * side effects - MUST MUST be called at startup ONCE before
409 * any other keyword hash routine is used.
415 cmd_dict
= irc_dictionary_create(strcasecmp
);
420 * inputs - command name
421 * - pointer to struct Message
423 * side effects - load this one command name
424 * msg->count msg->bytes is modified in place, in
425 * modules address space. Might not want to do that...
428 mod_add_cmd(struct Message
*msg
)
430 s_assert(msg
!= NULL
);
434 if (irc_dictionary_find(cmd_dict
, msg
->cmd
) != NULL
)
441 irc_dictionary_add(cmd_dict
, msg
->cmd
, msg
);
446 * inputs - command name
448 * side effects - unload this one command name
451 mod_del_cmd(struct Message
*msg
)
453 s_assert(msg
!= NULL
);
457 irc_dictionary_delete(cmd_dict
, msg
->cmd
);
463 * inputs - pointer to client to report to
465 * side effects - NONE
468 report_messages(struct Client
*source_p
)
470 struct DictionaryIter iter
;
472 struct alias_entry
*amsg
;
474 DICTIONARY_FOREACH(msg
, &iter
, cmd_dict
)
476 s_assert(msg
->cmd
!= NULL
);
477 sendto_one_numeric(source_p
, RPL_STATSCOMMANDS
,
478 form_str(RPL_STATSCOMMANDS
),
479 msg
->cmd
, msg
->count
,
480 msg
->bytes
, msg
->rcount
);
483 DICTIONARY_FOREACH(amsg
, &iter
, alias_dict
)
485 s_assert(amsg
->name
!= NULL
);
486 sendto_one_numeric(source_p
, RPL_STATSCOMMANDS
,
487 form_str(RPL_STATSCOMMANDS
),
488 amsg
->name
, amsg
->hits
, 0, 0);
494 * inputs - client who sent us the message, client with fake
496 * outputs - a given warning about the fake direction
500 cancel_clients(struct Client
*client_p
, struct Client
*source_p
, char *cmd
)
502 /* ok, fake prefix happens naturally during a burst on a nick
503 * collision with TS5, we cant kill them because one client has to
504 * survive, so we just send an error.
506 if(IsServer(source_p
) || IsMe(source_p
))
508 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
509 "Message for %s[%s] from %s",
510 source_p
->name
, source_p
->from
->name
,
515 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
516 "Message for %s[%s@%s!%s] from %s (TS, ignored)",
520 source_p
->from
->name
,
527 * inputs - client who gave us message, supposed sender, buffer
529 * side effects - kills issued for clients, squits for servers
532 remove_unknown(struct Client
*client_p
, char *lsender
, char *lbuffer
)
534 int slen
= strlen(lsender
);
536 struct Client
*server
;
538 /* meepfoo is a nickname (ignore)
539 * #XXXXXXXX is a UID (KILL)
540 * #XX is a SID (SQUIT)
541 * meep.foo is a server (SQUIT)
543 if((IsDigit(lsender
[0]) && slen
== 3) ||
544 (strchr(lsender
, '.') != NULL
))
546 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
547 "Unknown prefix (%s) from %s, Squitting %s",
548 lbuffer
, client_p
->name
, lsender
);
551 ":%s SQUIT %s :(Unknown prefix (%s) from %s)",
552 get_id(&me
, client_p
), lsender
,
553 lbuffer
, client_p
->name
);
555 else if(!IsDigit(lsender
[0]))
558 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
559 "Invalid prefix (%s) from %s",
560 lbuffer
, client_p
->name
);
563 memcpy(sid
, lsender
, 3);
565 server
= find_server(NULL
, sid
);
566 if (server
!= NULL
&& server
->from
== client_p
)
567 sendto_one(client_p
, ":%s KILL %s :%s (Unknown Client)",
568 get_id(&me
, client_p
), lsender
, me
.name
);
576 * parc number of arguments ('sender' counted as one!)
577 * parv[1]..parv[parc-1]
578 * pointers to additional parameters, this is a NULL
579 * terminated list (parv[parc] == NULL).
582 * Numerics are mostly error reports. If there is something
583 * wrong with the message, just *DROP* it! Don't even think of
584 * sending back a neat error message -- big danger of creating
585 * a ping pong error message...
588 do_numeric(char numeric
[], struct Client
*client_p
, struct Client
*source_p
, int parc
, char *parv
[])
590 struct Client
*target_p
;
591 struct Channel
*chptr
;
593 if(parc
< 2 || !IsServer(source_p
))
596 /* Remap low number numerics. */
597 if(numeric
[0] == '0')
601 * Prepare the parameter portion of the message into 'buffer'.
602 * (Because the buffer is twice as large as the message buffer
603 * for the socket, no overflow can occur here... ...on current
604 * assumptions--bets are off, if these are changed --msa)
605 * Note: if buffer is non-empty, it will begin with SPACE.
609 char *t
= buffer
; /* Current position within the buffer */
611 int tl
; /* current length of presently being built string in t */
612 for (i
= 2; i
< (parc
- 1); i
++)
614 tl
= rb_sprintf(t
, " %s", parv
[i
]);
617 rb_sprintf(t
, " :%s", parv
[parc
- 1]);
620 if((target_p
= find_client(parv
[1])) != NULL
)
625 * We shouldn't get numerics sent to us,
626 * any numerics we do get indicate a bug somewhere..
628 /* ugh. this is here because of nick collisions. when two servers
629 * relink, they burst each other their nicks, then perform collides.
630 * if there is a nick collision, BOTH servers will kill their own
631 * nicks, and BOTH will kill the other servers nick, which wont exist,
632 * because it will have been already killed by the local server.
634 * unfortunately, as we cant guarantee other servers will do the
635 * "right thing" on a nick collision, we have to keep both kills.
636 * ergo we need to ignore ERR_NOSUCHNICK. --fl_
638 /* quick comment. This _was_ tried. i.e. assume the other servers
639 * will do the "right thing" and kill a nick that is colliding.
640 * unfortunately, it did not work. --Dianora
642 /* note, now we send PING on server connect, we can
643 * also get ERR_NOSUCHSERVER..
645 if(atoi(numeric
) != ERR_NOSUCHNICK
&&
646 atoi(numeric
) != ERR_NOSUCHSERVER
)
647 sendto_realops_snomask(SNO_GENERAL
, L_ADMIN
,
648 "*** %s(via %s) sent a %s numeric to me: %s",
650 client_p
->name
, numeric
, buffer
);
653 else if(target_p
->from
== client_p
)
655 /* This message changed direction (nick collision?)
661 /* csircd will send out unknown umode flag for +a (admin), drop it here. */
662 if((atoi(numeric
) == ERR_UMODEUNKNOWNFLAG
) && MyClient(target_p
))
665 /* Fake it for server hiding, if its our client */
666 sendto_one(target_p
, ":%s %s %s%s",
667 get_id(source_p
, target_p
), numeric
,
668 get_id(target_p
, target_p
), buffer
);
671 else if((chptr
= find_channel(parv
[1])) != NULL
)
672 sendto_channel_flags(client_p
, ALL_MEMBERS
, source_p
, chptr
,
674 numeric
, chptr
->chname
, buffer
);
677 static void do_alias(struct alias_entry
*aptr
, struct Client
*source_p
, char *text
)
680 struct Client
*target_p
;
682 if (!IsFloodDone(source_p
) && source_p
->localClient
->receiveM
> 20)
683 flood_endgrace(source_p
);
685 p
= strchr(aptr
->target
, '@');
689 target_p
= find_server(NULL
, p
+ 1);
690 if (target_p
!= NULL
&& IsMe(target_p
))
695 /* nick, must be +S */
696 target_p
= find_named_person(aptr
->target
);
697 if (target_p
!= NULL
&& !IsService(target_p
))
701 if (target_p
== NULL
)
703 sendto_one_numeric(source_p
, ERR_SERVICESDOWN
, form_str(ERR_SERVICESDOWN
), aptr
->target
);
707 if (text
!= NULL
&& *text
== ':')
709 if (text
== NULL
|| *text
== '\0')
711 sendto_one(source_p
, form_str(ERR_NOTEXTTOSEND
), me
.name
, source_p
->name
);
715 /* increment the hitcounter on this alias */
718 sendto_one(target_p
, ":%s PRIVMSG %s :%s",
719 get_id(source_p
, target_p
),
720 p
!= NULL
? aptr
->target
: get_id(target_p
, target_p
),
725 m_not_oper(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
727 sendto_one_numeric(source_p
, ERR_NOPRIVILEGES
, form_str(ERR_NOPRIVILEGES
));
732 m_unregistered(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
735 * I don't =really= want to waste a bit in a flag
736 * number_of_nick_changes is only really valid after the client
737 * is fully registered..
739 if(client_p
->localClient
->number_of_nick_changes
== 0)
741 sendto_one(client_p
, form_str(ERR_NOTREGISTERED
), me
.name
);
742 client_p
->localClient
->number_of_nick_changes
++;
749 m_registered(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
751 sendto_one(client_p
, form_str(ERR_ALREADYREGISTRED
), me
.name
, source_p
->name
);
756 m_ignore(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])