]>
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 $
34 #include "irc_string.h"
35 #include "sprintf_irc.h"
46 static struct Dictionary
*cmd_dict
= NULL
;
47 struct Dictionary
*alias_dict
= NULL
;
50 * NOTE: parse() should not be called recursively by other functions!
54 /* parv[0] == source, and parv[LAST] == NULL */
55 static char *para
[MAXPARA
+ 2];
57 static void cancel_clients(struct Client
*, struct Client
*, char *);
58 static void remove_unknown(struct Client
*, char *, char *);
60 static void do_numeric(char[], struct Client
*, struct Client
*, int, char **);
61 static void do_alias(struct alias_entry
*, struct Client
*, char *);
63 static int handle_command(struct Message
*, struct Client
*, struct Client
*, int, const char**);
65 static char buffer
[1024];
67 /* turn a string into a parc/parv pair */
71 string_to_array(char *string
, char **parv
)
73 char *p
, *buf
= string
;
77 while (*buf
== ' ') /* skip leading spaces */
79 if(*buf
== '\0') /* ignore all-space args */
84 if(*buf
== ':') /* Last parameter */
95 if((p
= strchr(buf
, ' ')) != NULL
)
108 /* we can go upto parv[MAXPARA], as parv[0] is taken by source */
121 * given a raw buffer, parses it and generates parv, parc and sender
124 parse(struct Client
*client_p
, char *pbuffer
, char *bufend
)
126 struct Client
*from
= client_p
;
132 struct Message
*mptr
;
134 s_assert(MyConnect(client_p
));
135 s_assert(client_p
->localClient
->F
->fd
>= 0);
136 if(IsAnyDead(client_p
))
139 for (ch
= pbuffer
; *ch
== ' '; ch
++) /* skip spaces */
140 /* null statement */ ;
142 para
[0] = from
->name
;
148 /* point sender to the sender param */
151 if((s
= strchr(ch
, ' ')))
158 if(*sender
&& IsServer(client_p
))
160 from
= find_client(sender
);
162 /* didnt find any matching client, issue a kill */
165 ServerStats
->is_unpf
++;
166 remove_unknown(client_p
, sender
, pbuffer
);
170 para
[0] = from
->name
;
172 /* fake direction, hmm. */
173 if(from
->from
!= client_p
)
175 ServerStats
->is_wrdi
++;
176 cancel_clients(client_p
, from
, pbuffer
);
186 ServerStats
->is_empt
++;
190 /* at this point there must be some sort of command parameter */
193 * Extract the command code from the packet. Point s to the end
194 * of the command code and calculate the length using pointer
195 * arithmetic. Note: only need length for numerics and *all*
196 * numerics must have parameters and thus a space after the command
200 /* EOB is 3 chars long but is not a numeric */
202 if(*(ch
+ 3) == ' ' && /* ok, lets see if its a possible numeric.. */
203 IsDigit(*ch
) && IsDigit(*(ch
+ 1)) && IsDigit(*(ch
+ 2)))
207 ServerStats
->is_num
++;
208 s
= ch
+ 3; /* I know this is ' ' from above if */
209 *s
++ = '\0'; /* blow away the ' ', and point s to next part */
215 if((s
= strchr(ch
, ' ')))
218 mptr
= irc_dictionary_retrieve(cmd_dict
, ch
);
220 /* no command or its encap only, error */
221 if(!mptr
|| !mptr
->cmd
)
224 * Note: Give error message *only* to recognized
225 * persons. It's a nightmare situation to have
226 * two programs sending "Unknown command"'s or
227 * equivalent to each other at full blast....
228 * If it has got to person state, it at least
229 * seems to be well behaving. Perhaps this message
230 * should never be generated, though... --msa
231 * Hm, when is the buffer empty -- if a command
232 * code has been found ?? -Armin
234 if(pbuffer
[0] != '\0')
236 if (IsPerson(client_p
))
238 struct alias_entry
*aptr
= irc_dictionary_retrieve(alias_dict
, ch
);
241 do_alias(aptr
, client_p
, s
);
247 sendto_one(from
, form_str(ERR_UNKNOWNCOMMAND
),
248 me
.name
, from
->name
, ch
);
251 ServerStats
->is_unco
++;
255 ii
= bufend
- ((s
) ? s
: ch
);
261 /* XXX this should be done before parse() is called */
268 i
= string_to_array(s
, para
);
272 do_numeric(numeric
, client_p
, from
, i
, para
);
276 if(handle_command(mptr
, client_p
, from
, i
, /* XXX discards const!!! */ (const char **)para
) < -1)
279 for (p
= pbuffer
; p
<= end
; p
+= 8)
282 /* Its expected this nasty code can be removed
283 * or rewritten later if still needed.
285 if((unsigned long) (p
+ 8) > (unsigned long) end
)
287 for (; p
<= end
; p
++)
289 ilog(L_MAIN
, "%02x |%c", p
[0], p
[0]);
294 "%02x %02x %02x %02x %02x %02x %02x %02x |%c%c%c%c%c%c%c%c",
295 p
[0], p
[1], p
[2], p
[3], p
[4], p
[5],
296 p
[6], p
[7], p
[0], p
[1], p
[2], p
[3], p
[4], p
[5], p
[6], p
[7]);
305 * inputs - pointer to message block
306 * - pointer to client
307 * - pointer to client message is from
308 * - count of number of args
309 * - pointer to argv[] array
310 * output - -1 if error from server
314 handle_command(struct Message
*mptr
, struct Client
*client_p
,
315 struct Client
*from
, int i
, const char** hpara
)
317 struct MessageEntry ehandler
;
318 MessageHandler handler
= 0;
319 char squitreason
[80];
321 if(IsAnyDead(client_p
))
324 if(IsServer(client_p
))
329 /* New patch to avoid server flooding from unregistered connects
330 - Pie-Man 07/27/2000 */
332 if(!IsRegistered(client_p
))
334 /* if its from a possible server connection
335 * ignore it.. more than likely its a header thats sneaked through
338 if(IsAnyServer(client_p
) && !(mptr
->flags
& MFLG_UNREG
))
342 ehandler
= mptr
->handlers
[from
->handler
];
343 handler
= ehandler
.handler
;
345 /* check right amount of params is passed... --is */
346 if(i
< ehandler
.min_para
||
347 (ehandler
.min_para
&& EmptyString(hpara
[ehandler
.min_para
- 1])))
349 if(!IsServer(client_p
))
351 sendto_one(client_p
, form_str(ERR_NEEDMOREPARAMS
),
353 EmptyString(client_p
->name
) ? "*" : client_p
->name
,
355 if(MyClient(client_p
))
361 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
362 "Dropping server %s due to (invalid) command '%s'"
363 " with only %d arguments (expecting %d).",
364 client_p
->name
, mptr
->cmd
, i
, ehandler
.min_para
);
366 "Insufficient parameters (%d < %d) for command '%s' from %s.",
367 i
, ehandler
.min_para
, mptr
->cmd
, client_p
->name
);
368 snprintf(squitreason
, sizeof squitreason
,
369 "Insufficient parameters (%d < %d) for command '%s'",
370 i
, ehandler
.min_para
, mptr
->cmd
);
371 exit_client(client_p
, client_p
, client_p
, squitreason
);
375 (*handler
) (client_p
, from
, i
, hpara
);
380 handle_encap(struct Client
*client_p
, struct Client
*source_p
,
381 const char *command
, int parc
, const char *parv
[])
383 struct Message
*mptr
;
384 struct MessageEntry ehandler
;
385 MessageHandler handler
= 0;
387 parv
[0] = source_p
->name
;
389 mptr
= irc_dictionary_retrieve(cmd_dict
, command
);
391 if(mptr
== NULL
|| mptr
->cmd
== NULL
)
394 ehandler
= mptr
->handlers
[ENCAP_HANDLER
];
395 handler
= ehandler
.handler
;
397 if(parc
< ehandler
.min_para
||
398 (ehandler
.min_para
&& EmptyString(parv
[ehandler
.min_para
- 1])))
401 (*handler
) (client_p
, source_p
, parc
, parv
);
409 * side effects - MUST MUST be called at startup ONCE before
410 * any other keyword hash routine is used.
416 cmd_dict
= irc_dictionary_create(strcasecmp
);
421 * inputs - command name
422 * - pointer to struct Message
424 * side effects - load this one command name
425 * msg->count msg->bytes is modified in place, in
426 * modules address space. Might not want to do that...
429 mod_add_cmd(struct Message
*msg
)
431 s_assert(msg
!= NULL
);
435 if (irc_dictionary_find(cmd_dict
, msg
->cmd
) != NULL
)
442 irc_dictionary_add(cmd_dict
, msg
->cmd
, msg
);
447 * inputs - command name
449 * side effects - unload this one command name
452 mod_del_cmd(struct Message
*msg
)
454 s_assert(msg
!= NULL
);
458 irc_dictionary_delete(cmd_dict
, msg
->cmd
);
464 * inputs - pointer to client to report to
466 * side effects - NONE
469 report_messages(struct Client
*source_p
)
471 struct DictionaryIter iter
;
473 struct alias_entry
*amsg
;
475 DICTIONARY_FOREACH(msg
, &iter
, cmd_dict
)
477 s_assert(msg
->cmd
!= NULL
);
478 sendto_one_numeric(source_p
, RPL_STATSCOMMANDS
,
479 form_str(RPL_STATSCOMMANDS
),
480 msg
->cmd
, msg
->count
,
481 msg
->bytes
, msg
->rcount
);
484 DICTIONARY_FOREACH(amsg
, &iter
, alias_dict
)
486 s_assert(amsg
->name
!= NULL
);
487 sendto_one_numeric(source_p
, RPL_STATSCOMMANDS
,
488 form_str(RPL_STATSCOMMANDS
),
489 amsg
->name
, amsg
->hits
, 0, 0);
495 * inputs - client who sent us the message, client with fake
497 * outputs - a given warning about the fake direction
501 cancel_clients(struct Client
*client_p
, struct Client
*source_p
, char *cmd
)
503 /* ok, fake prefix happens naturally during a burst on a nick
504 * collision with TS5, we cant kill them because one client has to
505 * survive, so we just send an error.
507 if(IsServer(source_p
) || IsMe(source_p
))
509 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
510 "Message for %s[%s] from %s",
511 source_p
->name
, source_p
->from
->name
,
512 get_server_name(client_p
, SHOW_IP
));
516 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
517 "Message for %s[%s@%s!%s] from %s (TS, ignored)",
521 source_p
->from
->name
,
522 get_server_name(client_p
, SHOW_IP
));
528 * inputs - client who gave us message, supposed sender, buffer
530 * side effects - kills issued for clients, squits for servers
533 remove_unknown(struct Client
*client_p
, char *lsender
, char *lbuffer
)
535 int slen
= strlen(lsender
);
537 /* meepfoo is a nickname (KILL)
538 * #XXXXXXXX is a UID (KILL)
539 * #XX is a SID (SQUIT)
540 * meep.foo is a server (SQUIT)
542 if((IsDigit(lsender
[0]) && slen
== 3) ||
543 (strchr(lsender
, '.') != NULL
))
545 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
546 "Unknown prefix (%s) from %s, Squitting %s",
547 lbuffer
, get_server_name(client_p
, SHOW_IP
), lsender
);
550 ":%s SQUIT %s :(Unknown prefix (%s) from %s)",
551 get_id(&me
, client_p
), lsender
,
552 lbuffer
, client_p
->name
);
555 sendto_one(client_p
, ":%s KILL %s :%s (Unknown Client)",
556 get_id(&me
, client_p
), lsender
, me
.name
);
563 * parc number of arguments ('sender' counted as one!)
564 * parv[0] pointer to 'sender' (may point to empty string) (not used)
565 * parv[1]..parv[parc-1]
566 * pointers to additional parameters, this is a NULL
567 * terminated list (parv[parc] == NULL).
570 * Numerics are mostly error reports. If there is something
571 * wrong with the message, just *DROP* it! Don't even think of
572 * sending back a neat error message -- big danger of creating
573 * a ping pong error message...
576 do_numeric(char numeric
[], struct Client
*client_p
, struct Client
*source_p
, int parc
, char *parv
[])
578 struct Client
*target_p
;
579 struct Channel
*chptr
;
581 if(parc
< 2 || !IsServer(source_p
))
584 /* Remap low number numerics. */
585 if(numeric
[0] == '0')
589 * Prepare the parameter portion of the message into 'buffer'.
590 * (Because the buffer is twice as large as the message buffer
591 * for the socket, no overflow can occur here... ...on current
592 * assumptions--bets are off, if these are changed --msa)
593 * Note: if buffer is non-empty, it will begin with SPACE.
597 char *t
= buffer
; /* Current position within the buffer */
599 int tl
; /* current length of presently being built string in t */
600 for (i
= 2; i
< (parc
- 1); i
++)
602 tl
= rb_sprintf(t
, " %s", parv
[i
]);
605 rb_sprintf(t
, " :%s", parv
[parc
- 1]);
608 if((target_p
= find_client(parv
[1])) != NULL
)
613 * We shouldn't get numerics sent to us,
614 * any numerics we do get indicate a bug somewhere..
616 /* ugh. this is here because of nick collisions. when two servers
617 * relink, they burst each other their nicks, then perform collides.
618 * if there is a nick collision, BOTH servers will kill their own
619 * nicks, and BOTH will kill the other servers nick, which wont exist,
620 * because it will have been already killed by the local server.
622 * unfortunately, as we cant guarantee other servers will do the
623 * "right thing" on a nick collision, we have to keep both kills.
624 * ergo we need to ignore ERR_NOSUCHNICK. --fl_
626 /* quick comment. This _was_ tried. i.e. assume the other servers
627 * will do the "right thing" and kill a nick that is colliding.
628 * unfortunately, it did not work. --Dianora
630 /* note, now we send PING on server connect, we can
631 * also get ERR_NOSUCHSERVER..
633 if(atoi(numeric
) != ERR_NOSUCHNICK
&&
634 atoi(numeric
) != ERR_NOSUCHSERVER
)
635 sendto_realops_snomask(SNO_GENERAL
, L_ADMIN
,
636 "*** %s(via %s) sent a %s numeric to me: %s",
638 client_p
->name
, numeric
, buffer
);
641 else if(target_p
->from
== client_p
)
643 /* This message changed direction (nick collision?)
649 /* csircd will send out unknown umode flag for +a (admin), drop it here. */
650 if((atoi(numeric
) == ERR_UMODEUNKNOWNFLAG
) && MyClient(target_p
))
653 /* Fake it for server hiding, if its our client */
654 sendto_one(target_p
, ":%s %s %s%s",
655 get_id(source_p
, target_p
), numeric
,
656 get_id(target_p
, target_p
), buffer
);
659 else if((chptr
= find_channel(parv
[1])) != NULL
)
660 sendto_channel_flags(client_p
, ALL_MEMBERS
, source_p
, chptr
,
662 numeric
, chptr
->chname
, buffer
);
665 static void do_alias(struct alias_entry
*aptr
, struct Client
*source_p
, char *text
)
668 struct Client
*target_p
;
670 if (!IsFloodDone(source_p
) && source_p
->localClient
->receiveM
> 20)
671 flood_endgrace(source_p
);
673 p
= strchr(aptr
->target
, '@');
677 target_p
= find_server(NULL
, p
+ 1);
678 if (target_p
!= NULL
&& IsMe(target_p
))
683 /* nick, must be +S */
684 target_p
= find_named_person(aptr
->target
);
685 if (target_p
!= NULL
&& !IsService(target_p
))
689 if (target_p
== NULL
)
691 sendto_one_numeric(source_p
, ERR_SERVICESDOWN
, form_str(ERR_SERVICESDOWN
), aptr
->target
);
695 if (text
!= NULL
&& *text
== ':')
697 if (text
== NULL
|| *text
== '\0')
699 sendto_one(source_p
, form_str(ERR_NOTEXTTOSEND
), me
.name
, source_p
->name
);
703 /* increment the hitcounter on this alias */
706 sendto_one(target_p
, ":%s PRIVMSG %s :%s",
707 get_id(source_p
, target_p
),
708 p
!= NULL
? aptr
->target
: get_id(target_p
, target_p
),
713 m_not_oper(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
715 sendto_one_numeric(source_p
, ERR_NOPRIVILEGES
, form_str(ERR_NOPRIVILEGES
));
720 m_unregistered(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
723 * I don't =really= want to waste a bit in a flag
724 * number_of_nick_changes is only really valid after the client
725 * is fully registered..
727 if(client_p
->localClient
->number_of_nick_changes
== 0)
729 sendto_one(client_p
, form_str(ERR_NOTREGISTERED
), me
.name
);
730 client_p
->localClient
->number_of_nick_changes
++;
737 m_registered(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
739 sendto_one(client_p
, form_str(ERR_ALREADYREGISTRED
), me
.name
, source_p
->name
);
744 m_ignore(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])