]>
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
;
48 /* parv[0] is not used, and parv[LAST] == NULL */
49 static char *para
[MAXPARA
+ 2];
51 static void cancel_clients(struct Client
*, struct Client
*, char *);
52 static void remove_unknown(struct Client
*, char *, char *);
54 static void do_numeric(char[], struct Client
*, struct Client
*, int, char **);
55 static void do_alias(struct alias_entry
*, struct Client
*, char *);
57 static int handle_command(struct Message
*, struct Client
*, struct Client
*, int, const char**);
59 static char buffer
[1024];
61 /* turn a string into a parc/parv pair */
65 string_to_array(char *string
, char **parv
)
67 char *p
, *buf
= string
;
71 while (*buf
== ' ') /* skip leading spaces */
73 if(*buf
== '\0') /* ignore all-space args */
78 if(*buf
== ':') /* Last parameter */
89 if((p
= strchr(buf
, ' ')) != NULL
)
102 /* we can go upto parv[MAXPARA], as parv[0] is skipped */
115 * given a raw buffer, parses it and generates parv and parc
118 parse(struct Client
*client_p
, char *pbuffer
, char *bufend
)
120 struct Client
*from
= client_p
;
127 struct Message
*mptr
;
129 s_assert(MyConnect(client_p
));
130 s_assert(client_p
->localClient
->F
!= NULL
);
131 if(IsAnyDead(client_p
))
134 for (ch
= pbuffer
; *ch
== ' '; ch
++) /* skip spaces */
135 /* null statement */ ;
137 para
[0] = from
->name
;
143 /* point sender to the sender param */
146 if((s
= strchr(ch
, ' ')))
153 if(*sender
&& IsServer(client_p
))
155 from
= find_client(sender
);
157 /* didnt find any matching client, issue a kill */
160 ServerStats
.is_unpf
++;
161 remove_unknown(client_p
, sender
, pbuffer
);
165 para
[0] = from
->name
;
167 /* fake direction, hmm. */
168 if(from
->from
!= client_p
)
170 ServerStats
.is_wrdi
++;
171 cancel_clients(client_p
, from
, pbuffer
);
181 ServerStats
.is_empt
++;
185 /* at this point there must be some sort of command parameter */
188 * Extract the command code from the packet. Point s to the end
189 * of the command code and calculate the length using pointer
190 * arithmetic. Note: only need length for numerics and *all*
191 * numerics must have parameters and thus a space after the command
195 /* EOB is 3 chars long but is not a numeric */
197 if(*(ch
+ 3) == ' ' && /* ok, lets see if its a possible numeric.. */
198 IsDigit(*ch
) && IsDigit(*(ch
+ 1)) && IsDigit(*(ch
+ 2)))
202 ServerStats
.is_num
++;
203 s
= ch
+ 3; /* I know this is ' ' from above if */
204 *s
++ = '\0'; /* blow away the ' ', and point s to next part */
210 if((s
= strchr(ch
, ' ')))
213 mptr
= irc_dictionary_retrieve(cmd_dict
, ch
);
215 /* no command or its encap only, error */
216 if(!mptr
|| !mptr
->cmd
)
219 * Note: Give error message *only* to recognized
220 * persons. It's a nightmare situation to have
221 * two programs sending "Unknown command"'s or
222 * equivalent to each other at full blast....
223 * If it has got to person state, it at least
224 * seems to be well behaving. Perhaps this message
225 * should never be generated, though... --msa
226 * Hm, when is the buffer empty -- if a command
227 * code has been found ?? -Armin
229 if(pbuffer
[0] != '\0')
231 if (IsPerson(client_p
))
233 struct alias_entry
*aptr
= irc_dictionary_retrieve(alias_dict
, ch
);
236 do_alias(aptr
, client_p
, s
);
242 sendto_one(from
, form_str(ERR_UNKNOWNCOMMAND
),
243 me
.name
, from
->name
, ch
);
246 ServerStats
.is_unco
++;
250 ii
= bufend
- ((s
) ? s
: ch
);
256 /* XXX this should be done before parse() is called */
263 i
= string_to_array(s
, para
);
267 do_numeric(numeric
, client_p
, from
, i
, para
);
271 if(handle_command(mptr
, client_p
, from
, i
, /* XXX discards const!!! */ (const char **)para
) < -1)
274 for (p
= pbuffer
; p
<= end
; p
+= 8)
277 /* Its expected this nasty code can be removed
278 * or rewritten later if still needed.
280 if((unsigned long) (p
+ 8) > (unsigned long) end
)
282 for (; p
<= end
; p
++)
284 ilog(L_MAIN
, "%02x |%c", p
[0], p
[0]);
289 "%02x %02x %02x %02x %02x %02x %02x %02x |%c%c%c%c%c%c%c%c",
290 p
[0], p
[1], p
[2], p
[3], p
[4], p
[5],
291 p
[6], p
[7], p
[0], p
[1], p
[2], p
[3], p
[4], p
[5], p
[6], p
[7]);
300 * inputs - pointer to message block
301 * - pointer to client
302 * - pointer to client message is from
303 * - count of number of args
304 * - pointer to argv[] array
305 * output - -1 if error from server
309 handle_command(struct Message
*mptr
, struct Client
*client_p
,
310 struct Client
*from
, int i
, const char** hpara
)
312 struct MessageEntry ehandler
;
313 MessageHandler handler
= 0;
314 char squitreason
[80];
316 if(IsAnyDead(client_p
))
319 if(IsServer(client_p
))
324 /* New patch to avoid server flooding from unregistered connects
325 - Pie-Man 07/27/2000 */
327 if(!IsRegistered(client_p
))
329 /* if its from a possible server connection
330 * ignore it.. more than likely its a header thats sneaked through
333 if(IsAnyServer(client_p
) && !(mptr
->flags
& MFLG_UNREG
))
337 ehandler
= mptr
->handlers
[from
->handler
];
338 handler
= ehandler
.handler
;
340 /* check right amount of params is passed... --is */
341 if(i
< ehandler
.min_para
||
342 (ehandler
.min_para
&& EmptyString(hpara
[ehandler
.min_para
- 1])))
344 if(!IsServer(client_p
))
346 sendto_one(client_p
, form_str(ERR_NEEDMOREPARAMS
),
348 EmptyString(client_p
->name
) ? "*" : client_p
->name
,
350 if(MyClient(client_p
))
356 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
357 "Dropping server %s due to (invalid) command '%s'"
358 " with only %d arguments (expecting %d).",
359 client_p
->name
, mptr
->cmd
, i
, ehandler
.min_para
);
361 "Insufficient parameters (%d < %d) for command '%s' from %s.",
362 i
, ehandler
.min_para
, mptr
->cmd
, client_p
->name
);
363 rb_snprintf(squitreason
, sizeof squitreason
,
364 "Insufficient parameters (%d < %d) for command '%s'",
365 i
, ehandler
.min_para
, mptr
->cmd
);
366 exit_client(client_p
, client_p
, client_p
, squitreason
);
370 (*handler
) (client_p
, from
, i
, hpara
);
375 handle_encap(struct Client
*client_p
, struct Client
*source_p
,
376 const char *command
, int parc
, const char *parv
[])
378 struct Message
*mptr
;
379 struct MessageEntry ehandler
;
380 MessageHandler handler
= 0;
382 parv
[0] = source_p
->name
;
384 mptr
= irc_dictionary_retrieve(cmd_dict
, command
);
386 if(mptr
== NULL
|| mptr
->cmd
== NULL
)
389 ehandler
= mptr
->handlers
[ENCAP_HANDLER
];
390 handler
= ehandler
.handler
;
392 if(parc
< ehandler
.min_para
||
393 (ehandler
.min_para
&& EmptyString(parv
[ehandler
.min_para
- 1])))
396 (*handler
) (client_p
, source_p
, parc
, parv
);
404 * side effects - MUST MUST be called at startup ONCE before
405 * any other keyword hash routine is used.
411 cmd_dict
= irc_dictionary_create(strcasecmp
);
416 * inputs - command name
417 * - pointer to struct Message
419 * side effects - load this one command name
420 * msg->count msg->bytes is modified in place, in
421 * modules address space. Might not want to do that...
424 mod_add_cmd(struct Message
*msg
)
426 s_assert(msg
!= NULL
);
430 if (irc_dictionary_find(cmd_dict
, msg
->cmd
) != NULL
)
437 irc_dictionary_add(cmd_dict
, msg
->cmd
, msg
);
442 * inputs - command name
444 * side effects - unload this one command name
447 mod_del_cmd(struct Message
*msg
)
449 s_assert(msg
!= NULL
);
453 irc_dictionary_delete(cmd_dict
, msg
->cmd
);
459 * inputs - pointer to client to report to
461 * side effects - NONE
464 report_messages(struct Client
*source_p
)
466 struct DictionaryIter iter
;
468 struct alias_entry
*amsg
;
470 DICTIONARY_FOREACH(msg
, &iter
, cmd_dict
)
472 s_assert(msg
->cmd
!= NULL
);
473 sendto_one_numeric(source_p
, RPL_STATSCOMMANDS
,
474 form_str(RPL_STATSCOMMANDS
),
475 msg
->cmd
, msg
->count
,
476 msg
->bytes
, msg
->rcount
);
479 DICTIONARY_FOREACH(amsg
, &iter
, alias_dict
)
481 s_assert(amsg
->name
!= NULL
);
482 sendto_one_numeric(source_p
, RPL_STATSCOMMANDS
,
483 form_str(RPL_STATSCOMMANDS
),
484 amsg
->name
, amsg
->hits
, 0, 0);
490 * inputs - client who sent us the message, client with fake
492 * outputs - a given warning about the fake direction
496 cancel_clients(struct Client
*client_p
, struct Client
*source_p
, char *cmd
)
498 /* ok, fake prefix happens naturally during a burst on a nick
499 * collision with TS5, we cant kill them because one client has to
500 * survive, so we just send an error.
502 if(IsServer(source_p
) || IsMe(source_p
))
504 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
505 "Message for %s[%s] from %s",
506 source_p
->name
, source_p
->from
->name
,
511 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
512 "Message for %s[%s@%s!%s] from %s (TS, ignored)",
516 source_p
->from
->name
,
523 * inputs - client who gave us message, supposed sender, buffer
525 * side effects - kills issued for clients, squits for servers
528 remove_unknown(struct Client
*client_p
, char *lsender
, char *lbuffer
)
530 int slen
= strlen(lsender
);
532 struct Client
*server
;
534 /* meepfoo is a nickname (ignore)
535 * #XXXXXXXX is a UID (KILL)
536 * #XX is a SID (SQUIT)
537 * meep.foo is a server (SQUIT)
539 if((IsDigit(lsender
[0]) && slen
== 3) ||
540 (strchr(lsender
, '.') != NULL
))
542 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
543 "Unknown prefix (%s) from %s, Squitting %s",
544 lbuffer
, client_p
->name
, lsender
);
547 ":%s SQUIT %s :(Unknown prefix (%s) from %s)",
548 get_id(&me
, client_p
), lsender
,
549 lbuffer
, client_p
->name
);
551 else if(!IsDigit(lsender
[0]))
554 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
555 "Invalid prefix (%s) from %s",
556 lbuffer
, client_p
->name
);
559 memcpy(sid
, lsender
, 3);
561 server
= find_server(NULL
, sid
);
562 if (server
!= NULL
&& server
->from
== client_p
)
563 sendto_one(client_p
, ":%s KILL %s :%s (Unknown Client)",
564 get_id(&me
, client_p
), lsender
, me
.name
);
572 * parc number of arguments ('sender' counted as one!)
573 * parv[1]..parv[parc-1]
574 * pointers to additional parameters, this is a NULL
575 * terminated list (parv[parc] == NULL).
578 * Numerics are mostly error reports. If there is something
579 * wrong with the message, just *DROP* it! Don't even think of
580 * sending back a neat error message -- big danger of creating
581 * a ping pong error message...
584 do_numeric(char numeric
[], struct Client
*client_p
, struct Client
*source_p
, int parc
, char *parv
[])
586 struct Client
*target_p
;
587 struct Channel
*chptr
;
589 if(parc
< 2 || !IsServer(source_p
))
592 /* Remap low number numerics. */
593 if(numeric
[0] == '0')
597 * Prepare the parameter portion of the message into 'buffer'.
598 * (Because the buffer is twice as large as the message buffer
599 * for the socket, no overflow can occur here... ...on current
600 * assumptions--bets are off, if these are changed --msa)
601 * Note: if buffer is non-empty, it will begin with SPACE.
605 char *t
= buffer
; /* Current position within the buffer */
607 int tl
; /* current length of presently being built string in t */
608 for (i
= 2; i
< (parc
- 1); i
++)
610 tl
= rb_sprintf(t
, " %s", parv
[i
]);
613 rb_sprintf(t
, " :%s", parv
[parc
- 1]);
616 if((target_p
= find_client(parv
[1])) != NULL
)
621 * We shouldn't get numerics sent to us,
622 * any numerics we do get indicate a bug somewhere..
624 /* ugh. this is here because of nick collisions. when two servers
625 * relink, they burst each other their nicks, then perform collides.
626 * if there is a nick collision, BOTH servers will kill their own
627 * nicks, and BOTH will kill the other servers nick, which wont exist,
628 * because it will have been already killed by the local server.
630 * unfortunately, as we cant guarantee other servers will do the
631 * "right thing" on a nick collision, we have to keep both kills.
632 * ergo we need to ignore ERR_NOSUCHNICK. --fl_
634 /* quick comment. This _was_ tried. i.e. assume the other servers
635 * will do the "right thing" and kill a nick that is colliding.
636 * unfortunately, it did not work. --Dianora
638 /* note, now we send PING on server connect, we can
639 * also get ERR_NOSUCHSERVER..
641 if(atoi(numeric
) != ERR_NOSUCHNICK
&&
642 atoi(numeric
) != ERR_NOSUCHSERVER
)
643 sendto_realops_snomask(SNO_GENERAL
, L_ADMIN
,
644 "*** %s(via %s) sent a %s numeric to me: %s",
646 client_p
->name
, numeric
, buffer
);
649 else if(target_p
->from
== client_p
)
651 /* This message changed direction (nick collision?)
657 /* csircd will send out unknown umode flag for +a (admin), drop it here. */
658 if((atoi(numeric
) == ERR_UMODEUNKNOWNFLAG
) && MyClient(target_p
))
661 /* Fake it for server hiding, if its our client */
662 sendto_one(target_p
, ":%s %s %s%s",
663 get_id(source_p
, target_p
), numeric
,
664 get_id(target_p
, target_p
), buffer
);
667 else if((chptr
= find_channel(parv
[1])) != NULL
)
668 sendto_channel_flags(client_p
, ALL_MEMBERS
, source_p
, chptr
,
670 numeric
, chptr
->chname
, buffer
);
673 static void do_alias(struct alias_entry
*aptr
, struct Client
*source_p
, char *text
)
676 struct Client
*target_p
;
678 if (!IsFloodDone(source_p
) && source_p
->localClient
->receiveM
> 20)
679 flood_endgrace(source_p
);
681 p
= strchr(aptr
->target
, '@');
685 target_p
= find_server(NULL
, p
+ 1);
686 if (target_p
!= NULL
&& IsMe(target_p
))
691 /* nick, must be +S */
692 target_p
= find_named_person(aptr
->target
);
693 if (target_p
!= NULL
&& !IsService(target_p
))
697 if (target_p
== NULL
)
699 sendto_one_numeric(source_p
, ERR_SERVICESDOWN
, form_str(ERR_SERVICESDOWN
), aptr
->target
);
703 if (text
!= NULL
&& *text
== ':')
705 if (text
== NULL
|| *text
== '\0')
707 sendto_one(source_p
, form_str(ERR_NOTEXTTOSEND
), me
.name
, source_p
->name
);
711 /* increment the hitcounter on this alias */
714 sendto_one(target_p
, ":%s PRIVMSG %s :%s",
715 get_id(source_p
, target_p
),
716 p
!= NULL
? aptr
->target
: get_id(target_p
, target_p
),
721 m_not_oper(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
723 sendto_one_numeric(source_p
, ERR_NOPRIVILEGES
, form_str(ERR_NOPRIVILEGES
));
728 m_unregistered(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
731 * I don't =really= want to waste a bit in a flag
732 * number_of_nick_changes is only really valid after the client
733 * is fully registered..
735 if(client_p
->localClient
->number_of_nick_changes
== 0)
737 sendto_one(client_p
, form_str(ERR_NOTREGISTERED
), me
.name
);
738 client_p
->localClient
->number_of_nick_changes
++;
745 m_registered(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
747 sendto_one(client_p
, form_str(ERR_ALREADYREGISTRED
), me
.name
, source_p
->name
);
752 m_ignore(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])