]>
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 $
46 static struct Dictionary
*cmd_dict
= NULL
;
47 struct Dictionary
*alias_dict
= NULL
;
49 /* parv[0] is not used, and parv[LAST] == NULL */
50 static char *para
[MAXPARA
+ 2];
52 static void cancel_clients(struct Client
*, struct Client
*, char *);
53 static void remove_unknown(struct Client
*, char *, char *);
55 static void do_numeric(char[], struct Client
*, struct Client
*, int, char **);
56 static void do_alias(struct alias_entry
*, struct Client
*, char *);
58 static int handle_command(struct Message
*, struct Client
*, struct Client
*, int, const char**);
60 static char buffer
[1024];
62 /* turn a string into a parc/parv pair */
66 string_to_array(char *string
, char **parv
)
68 char *p
, *buf
= string
;
72 while (*buf
== ' ') /* skip leading spaces */
74 if(*buf
== '\0') /* ignore all-space args */
79 if(*buf
== ':') /* Last parameter */
90 if((p
= strchr(buf
, ' ')) != NULL
)
103 /* we can go upto parv[MAXPARA], as parv[0] is skipped */
116 * given a raw buffer, parses it and generates parv and parc
119 parse(struct Client
*client_p
, char *pbuffer
, char *bufend
)
121 struct Client
*from
= client_p
;
128 struct Message
*mptr
;
130 s_assert(MyConnect(client_p
));
131 s_assert(client_p
->localClient
->F
!= NULL
);
132 if(IsAnyDead(client_p
))
135 for (ch
= pbuffer
; *ch
== ' '; ch
++) /* skip spaces */
136 /* null statement */ ;
138 para
[0] = from
->name
;
144 /* point sender to the sender param */
147 if((s
= strchr(ch
, ' ')))
154 if(*sender
&& IsServer(client_p
))
156 from
= find_client(sender
);
158 /* didnt find any matching client, issue a kill */
161 ServerStats
.is_unpf
++;
162 remove_unknown(client_p
, sender
, pbuffer
);
166 para
[0] = from
->name
;
168 /* fake direction, hmm. */
169 if(from
->from
!= client_p
)
171 ServerStats
.is_wrdi
++;
172 cancel_clients(client_p
, from
, pbuffer
);
182 ServerStats
.is_empt
++;
186 /* at this point there must be some sort of command parameter */
189 * Extract the command code from the packet. Point s to the end
190 * of the command code and calculate the length using pointer
191 * arithmetic. Note: only need length for numerics and *all*
192 * numerics must have parameters and thus a space after the command
196 /* EOB is 3 chars long but is not a numeric */
198 if(*(ch
+ 3) == ' ' && /* ok, lets see if its a possible numeric.. */
199 IsDigit(*ch
) && IsDigit(*(ch
+ 1)) && IsDigit(*(ch
+ 2)))
203 ServerStats
.is_num
++;
204 s
= ch
+ 3; /* I know this is ' ' from above if */
205 *s
++ = '\0'; /* blow away the ' ', and point s to next part */
211 if((s
= strchr(ch
, ' ')))
214 mptr
= irc_dictionary_retrieve(cmd_dict
, ch
);
216 /* no command or its encap only, error */
217 if(!mptr
|| !mptr
->cmd
)
220 * Note: Give error message *only* to recognized
221 * persons. It's a nightmare situation to have
222 * two programs sending "Unknown command"'s or
223 * equivalent to each other at full blast....
224 * If it has got to person state, it at least
225 * seems to be well behaving. Perhaps this message
226 * should never be generated, though... --msa
227 * Hm, when is the buffer empty -- if a command
228 * code has been found ?? -Armin
230 if(pbuffer
[0] != '\0')
232 if (IsPerson(client_p
))
234 struct alias_entry
*aptr
= irc_dictionary_retrieve(alias_dict
, ch
);
237 do_alias(aptr
, client_p
, s
);
243 sendto_one(from
, form_str(ERR_UNKNOWNCOMMAND
),
244 me
.name
, from
->name
, ch
);
247 ServerStats
.is_unco
++;
251 ii
= bufend
- ((s
) ? s
: ch
);
257 /* XXX this should be done before parse() is called */
264 i
= string_to_array(s
, para
);
268 do_numeric(numeric
, client_p
, from
, i
, para
);
272 if(handle_command(mptr
, client_p
, from
, i
, /* XXX discards const!!! */ (const char **)para
) < -1)
275 for (p
= pbuffer
; p
<= end
; p
+= 8)
278 /* Its expected this nasty code can be removed
279 * or rewritten later if still needed.
281 if((unsigned long) (p
+ 8) > (unsigned long) end
)
283 for (; p
<= end
; p
++)
285 ilog(L_MAIN
, "%02x |%c", p
[0], p
[0]);
290 "%02x %02x %02x %02x %02x %02x %02x %02x |%c%c%c%c%c%c%c%c",
291 p
[0], p
[1], p
[2], p
[3], p
[4], p
[5],
292 p
[6], p
[7], p
[0], p
[1], p
[2], p
[3], p
[4], p
[5], p
[6], p
[7]);
301 * inputs - pointer to message block
302 * - pointer to client
303 * - pointer to client message is from
304 * - count of number of args
305 * - pointer to argv[] array
306 * output - -1 if error from server
310 handle_command(struct Message
*mptr
, struct Client
*client_p
,
311 struct Client
*from
, int i
, const char** hpara
)
313 struct MessageEntry ehandler
;
314 MessageHandler handler
= 0;
315 char squitreason
[80];
317 if(IsAnyDead(client_p
))
320 if(IsServer(client_p
))
325 /* New patch to avoid server flooding from unregistered connects
326 - Pie-Man 07/27/2000 */
328 if(!IsRegistered(client_p
))
330 /* if its from a possible server connection
331 * ignore it.. more than likely its a header thats sneaked through
334 if(IsAnyServer(client_p
) && !(mptr
->flags
& MFLG_UNREG
))
338 ehandler
= mptr
->handlers
[from
->handler
];
339 handler
= ehandler
.handler
;
341 /* check right amount of params is passed... --is */
342 if(i
< ehandler
.min_para
||
343 (ehandler
.min_para
&& EmptyString(hpara
[ehandler
.min_para
- 1])))
345 if(!IsServer(client_p
))
347 sendto_one(client_p
, form_str(ERR_NEEDMOREPARAMS
),
349 EmptyString(client_p
->name
) ? "*" : client_p
->name
,
351 if(MyClient(client_p
))
357 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
358 "Dropping server %s due to (invalid) command '%s'"
359 " with only %d arguments (expecting %d).",
360 client_p
->name
, mptr
->cmd
, i
, ehandler
.min_para
);
362 "Insufficient parameters (%d < %d) for command '%s' from %s.",
363 i
, ehandler
.min_para
, mptr
->cmd
, client_p
->name
);
364 rb_snprintf(squitreason
, sizeof squitreason
,
365 "Insufficient parameters (%d < %d) for command '%s'",
366 i
, ehandler
.min_para
, mptr
->cmd
);
367 exit_client(client_p
, client_p
, client_p
, squitreason
);
371 (*handler
) (client_p
, from
, i
, hpara
);
376 handle_encap(struct Client
*client_p
, struct Client
*source_p
,
377 const char *command
, int parc
, const char *parv
[])
379 struct Message
*mptr
;
380 struct MessageEntry ehandler
;
381 MessageHandler handler
= 0;
383 parv
[0] = source_p
->name
;
385 mptr
= irc_dictionary_retrieve(cmd_dict
, command
);
387 if(mptr
== NULL
|| mptr
->cmd
== NULL
)
390 ehandler
= mptr
->handlers
[ENCAP_HANDLER
];
391 handler
= ehandler
.handler
;
393 if(parc
< ehandler
.min_para
||
394 (ehandler
.min_para
&& EmptyString(parv
[ehandler
.min_para
- 1])))
397 (*handler
) (client_p
, source_p
, parc
, parv
);
405 * side effects - MUST MUST be called at startup ONCE before
406 * any other keyword hash routine is used.
412 cmd_dict
= irc_dictionary_create(strcasecmp
);
417 * inputs - command name
418 * - pointer to struct Message
420 * side effects - load this one command name
421 * msg->count msg->bytes is modified in place, in
422 * modules address space. Might not want to do that...
425 mod_add_cmd(struct Message
*msg
)
427 s_assert(msg
!= NULL
);
431 if (irc_dictionary_find(cmd_dict
, msg
->cmd
) != NULL
)
438 irc_dictionary_add(cmd_dict
, msg
->cmd
, msg
);
443 * inputs - command name
445 * side effects - unload this one command name
448 mod_del_cmd(struct Message
*msg
)
450 s_assert(msg
!= NULL
);
454 irc_dictionary_delete(cmd_dict
, msg
->cmd
);
460 * inputs - pointer to client to report to
462 * side effects - NONE
465 report_messages(struct Client
*source_p
)
467 struct DictionaryIter iter
;
469 struct alias_entry
*amsg
;
471 DICTIONARY_FOREACH(msg
, &iter
, cmd_dict
)
473 s_assert(msg
->cmd
!= NULL
);
474 sendto_one_numeric(source_p
, RPL_STATSCOMMANDS
,
475 form_str(RPL_STATSCOMMANDS
),
476 msg
->cmd
, msg
->count
,
477 msg
->bytes
, msg
->rcount
);
480 DICTIONARY_FOREACH(amsg
, &iter
, alias_dict
)
482 s_assert(amsg
->name
!= NULL
);
483 sendto_one_numeric(source_p
, RPL_STATSCOMMANDS
,
484 form_str(RPL_STATSCOMMANDS
),
485 amsg
->name
, amsg
->hits
, 0L, 0);
491 * inputs - client who sent us the message, client with fake
493 * outputs - a given warning about the fake direction
497 cancel_clients(struct Client
*client_p
, struct Client
*source_p
, char *cmd
)
499 /* ok, fake prefix happens naturally during a burst on a nick
500 * collision with TS5, we cant kill them because one client has to
501 * survive, so we just send an error.
503 if(IsServer(source_p
) || IsMe(source_p
))
505 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
506 "Message for %s[%s] from %s",
507 source_p
->name
, source_p
->from
->name
,
512 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
513 "Message for %s[%s@%s!%s] from %s (TS, ignored)",
517 source_p
->from
->name
,
524 * inputs - client who gave us message, supposed sender, buffer
526 * side effects - kills issued for clients, squits for servers
529 remove_unknown(struct Client
*client_p
, char *lsender
, char *lbuffer
)
531 int slen
= strlen(lsender
);
533 struct Client
*server
;
535 /* meepfoo is a nickname (ignore)
536 * #XXXXXXXX is a UID (KILL)
537 * #XX is a SID (SQUIT)
538 * meep.foo is a server (SQUIT)
540 if((IsDigit(lsender
[0]) && slen
== 3) ||
541 (strchr(lsender
, '.') != NULL
))
543 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
544 "Unknown prefix (%s) from %s, Squitting %s",
545 lbuffer
, client_p
->name
, lsender
);
548 ":%s SQUIT %s :(Unknown prefix (%s) from %s)",
549 get_id(&me
, client_p
), lsender
,
550 lbuffer
, client_p
->name
);
552 else if(!IsDigit(lsender
[0]))
555 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
556 "Invalid prefix (%s) from %s",
557 lbuffer
, client_p
->name
);
560 memcpy(sid
, lsender
, 3);
562 server
= find_server(NULL
, sid
);
563 if (server
!= NULL
&& server
->from
== client_p
)
564 sendto_one(client_p
, ":%s KILL %s :%s (Unknown Client)",
565 get_id(&me
, client_p
), lsender
, me
.name
);
573 * parc number of arguments ('sender' counted as one!)
574 * parv[1]..parv[parc-1]
575 * pointers to additional parameters, this is a NULL
576 * terminated list (parv[parc] == NULL).
579 * Numerics are mostly error reports. If there is something
580 * wrong with the message, just *DROP* it! Don't even think of
581 * sending back a neat error message -- big danger of creating
582 * a ping pong error message...
585 do_numeric(char numeric
[], struct Client
*client_p
, struct Client
*source_p
, int parc
, char *parv
[])
587 struct Client
*target_p
;
588 struct Channel
*chptr
;
590 if(parc
< 2 || !IsServer(source_p
))
593 /* Remap low number numerics. */
594 if(numeric
[0] == '0')
598 * Prepare the parameter portion of the message into 'buffer'.
599 * (Because the buffer is twice as large as the message buffer
600 * for the socket, no overflow can occur here... ...on current
601 * assumptions--bets are off, if these are changed --msa)
602 * Note: if buffer is non-empty, it will begin with SPACE.
606 char *t
= buffer
; /* Current position within the buffer */
608 int tl
; /* current length of presently being built string in t */
609 for (i
= 2; i
< (parc
- 1); i
++)
611 tl
= rb_sprintf(t
, " %s", parv
[i
]);
614 rb_sprintf(t
, " :%s", parv
[parc
- 1]);
617 if((target_p
= find_client(parv
[1])) != NULL
)
622 * We shouldn't get numerics sent to us,
623 * any numerics we do get indicate a bug somewhere..
625 /* ugh. this is here because of nick collisions. when two servers
626 * relink, they burst each other their nicks, then perform collides.
627 * if there is a nick collision, BOTH servers will kill their own
628 * nicks, and BOTH will kill the other servers nick, which wont exist,
629 * because it will have been already killed by the local server.
631 * unfortunately, as we cant guarantee other servers will do the
632 * "right thing" on a nick collision, we have to keep both kills.
633 * ergo we need to ignore ERR_NOSUCHNICK. --fl_
635 /* quick comment. This _was_ tried. i.e. assume the other servers
636 * will do the "right thing" and kill a nick that is colliding.
637 * unfortunately, it did not work. --Dianora
639 /* note, now we send PING on server connect, we can
640 * also get ERR_NOSUCHSERVER..
642 if(atoi(numeric
) != ERR_NOSUCHNICK
&&
643 atoi(numeric
) != ERR_NOSUCHSERVER
)
644 sendto_realops_snomask(SNO_GENERAL
, L_ADMIN
,
645 "*** %s(via %s) sent a %s numeric to me: %s",
647 client_p
->name
, numeric
, buffer
);
650 else if(target_p
->from
== client_p
)
652 /* This message changed direction (nick collision?)
658 /* csircd will send out unknown umode flag for +a (admin), drop it here. */
659 if((atoi(numeric
) == ERR_UMODEUNKNOWNFLAG
) && MyClient(target_p
))
662 /* Fake it for server hiding, if its our client */
663 sendto_one(target_p
, ":%s %s %s%s",
664 get_id(source_p
, target_p
), numeric
,
665 get_id(target_p
, target_p
), buffer
);
668 else if((chptr
= find_channel(parv
[1])) != NULL
)
669 sendto_channel_flags(client_p
, ALL_MEMBERS
, source_p
, chptr
,
671 numeric
, chptr
->chname
, buffer
);
674 static void do_alias(struct alias_entry
*aptr
, struct Client
*source_p
, char *text
)
677 struct Client
*target_p
;
679 if (!IsFloodDone(source_p
) && source_p
->localClient
->receiveM
> 20)
680 flood_endgrace(source_p
);
682 p
= strchr(aptr
->target
, '@');
686 target_p
= find_server(NULL
, p
+ 1);
687 if (target_p
!= NULL
&& IsMe(target_p
))
692 /* nick, must be +S */
693 target_p
= find_named_person(aptr
->target
);
694 if (target_p
!= NULL
&& !IsService(target_p
))
698 if (target_p
== NULL
)
700 sendto_one_numeric(source_p
, ERR_SERVICESDOWN
, form_str(ERR_SERVICESDOWN
), aptr
->target
);
704 if (text
!= NULL
&& *text
== ':')
706 if (text
== NULL
|| *text
== '\0')
708 sendto_one(source_p
, form_str(ERR_NOTEXTTOSEND
), me
.name
, source_p
->name
);
712 /* increment the hitcounter on this alias */
715 sendto_one(target_p
, ":%s PRIVMSG %s :%s",
716 get_id(source_p
, target_p
),
717 p
!= NULL
? aptr
->target
: get_id(target_p
, target_p
),
722 m_not_oper(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
724 sendto_one_numeric(source_p
, ERR_NOPRIVILEGES
, form_str(ERR_NOPRIVILEGES
));
729 m_unregistered(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
732 * I don't =really= want to waste a bit in a flag
733 * number_of_nick_changes is only really valid after the client
734 * is fully registered..
736 if(client_p
->localClient
->number_of_nick_changes
== 0)
738 sendto_one(client_p
, form_str(ERR_NOTREGISTERED
), me
.name
);
739 client_p
->localClient
->number_of_nick_changes
++;
746 m_registered(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
748 sendto_one(client_p
, form_str(ERR_ALREADYREGISTRED
), me
.name
, source_p
->name
);
753 m_ignore(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])