]>
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"
47 static struct Dictionary
*cmd_dict
= NULL
;
48 struct Dictionary
*alias_dict
= NULL
;
51 * NOTE: parse() should not be called recursively by other functions!
55 /* parv[0] == source, and parv[LAST] == NULL */
56 static char *para
[MAXPARA
+ 2];
58 static void cancel_clients(struct Client
*, struct Client
*, char *);
59 static void remove_unknown(struct Client
*, char *, char *);
61 static void do_numeric(char[], struct Client
*, struct Client
*, int, char **);
62 static void do_alias(struct alias_entry
*, struct Client
*, char *);
64 static int handle_command(struct Message
*, struct Client
*, struct Client
*, int, const char**);
66 static int cmd_hash(const char *p
);
68 static char buffer
[1024];
70 /* turn a string into a parc/parv pair */
74 string_to_array(char *string
, char **parv
)
76 char *p
, *buf
= string
;
80 while (*buf
== ' ') /* skip leading spaces */
82 if(*buf
== '\0') /* ignore all-space args */
87 if(*buf
== ':') /* Last parameter */
98 if((p
= strchr(buf
, ' ')) != NULL
)
111 /* we can go upto parv[MAXPARA], as parv[0] is taken by source */
124 * given a raw buffer, parses it and generates parv, parc and sender
127 parse(struct Client
*client_p
, char *pbuffer
, char *bufend
)
129 struct Client
*from
= client_p
;
135 struct Message
*mptr
;
137 s_assert(MyConnect(client_p
));
138 s_assert(client_p
->localClient
->fd
>= 0);
139 if(IsAnyDead(client_p
))
142 for (ch
= pbuffer
; *ch
== ' '; ch
++) /* skip spaces */
143 /* null statement */ ;
145 para
[0] = from
->name
;
151 /* point sender to the sender param */
154 if((s
= strchr(ch
, ' ')))
161 if(*sender
&& IsServer(client_p
))
163 from
= find_client(sender
);
165 /* didnt find any matching client, issue a kill */
168 ServerStats
->is_unpf
++;
169 remove_unknown(client_p
, sender
, pbuffer
);
173 para
[0] = from
->name
;
175 /* fake direction, hmm. */
176 if(from
->from
!= client_p
)
178 ServerStats
->is_wrdi
++;
179 cancel_clients(client_p
, from
, pbuffer
);
189 ServerStats
->is_empt
++;
193 /* at this point there must be some sort of command parameter */
196 * Extract the command code from the packet. Point s to the end
197 * of the command code and calculate the length using pointer
198 * arithmetic. Note: only need length for numerics and *all*
199 * numerics must have parameters and thus a space after the command
203 /* EOB is 3 chars long but is not a numeric */
205 if(*(ch
+ 3) == ' ' && /* ok, lets see if its a possible numeric.. */
206 IsDigit(*ch
) && IsDigit(*(ch
+ 1)) && IsDigit(*(ch
+ 2)))
210 ServerStats
->is_num
++;
211 s
= ch
+ 3; /* I know this is ' ' from above if */
212 *s
++ = '\0'; /* blow away the ' ', and point s to next part */
218 if((s
= strchr(ch
, ' ')))
221 mptr
= irc_dictionary_retrieve(cmd_dict
, mptr
);
223 /* no command or its encap only, error */
224 if(!mptr
|| !mptr
->cmd
)
227 * Note: Give error message *only* to recognized
228 * persons. It's a nightmare situation to have
229 * two programs sending "Unknown command"'s or
230 * equivalent to each other at full blast....
231 * If it has got to person state, it at least
232 * seems to be well behaving. Perhaps this message
233 * should never be generated, though... --msa
234 * Hm, when is the buffer empty -- if a command
235 * code has been found ?? -Armin
237 if(pbuffer
[0] != '\0')
239 if (IsPerson(client_p
))
241 struct alias_entry
*aptr
= irc_dictionary_retrieve(alias_dict
, ch
);
244 do_alias(aptr
, client_p
, s
);
250 sendto_one(from
, form_str(ERR_UNKNOWNCOMMAND
),
251 me
.name
, from
->name
, ch
);
254 ServerStats
->is_unco
++;
258 ii
= bufend
- ((s
) ? s
: ch
);
264 /* XXX this should be done before parse() is called */
271 i
= string_to_array(s
, para
);
275 do_numeric(numeric
, client_p
, from
, i
, para
);
279 if(handle_command(mptr
, client_p
, from
, i
, /* XXX discards const!!! */ (const char **)para
) < -1)
282 for (p
= pbuffer
; p
<= end
; p
+= 8)
285 /* Its expected this nasty code can be removed
286 * or rewritten later if still needed.
288 if((unsigned long) (p
+ 8) > (unsigned long) end
)
290 for (; p
<= end
; p
++)
292 ilog(L_MAIN
, "%02x |%c", p
[0], p
[0]);
297 "%02x %02x %02x %02x %02x %02x %02x %02x |%c%c%c%c%c%c%c%c",
298 p
[0], p
[1], p
[2], p
[3], p
[4], p
[5],
299 p
[6], p
[7], p
[0], p
[1], p
[2], p
[3], p
[4], p
[5], p
[6], p
[7]);
308 * inputs - pointer to message block
309 * - pointer to client
310 * - pointer to client message is from
311 * - count of number of args
312 * - pointer to argv[] array
313 * output - -1 if error from server
317 handle_command(struct Message
*mptr
, struct Client
*client_p
,
318 struct Client
*from
, int i
, const char** hpara
)
320 struct MessageEntry ehandler
;
321 MessageHandler handler
= 0;
322 char squitreason
[80];
324 if(IsAnyDead(client_p
))
327 if(IsServer(client_p
))
332 /* New patch to avoid server flooding from unregistered connects
333 - Pie-Man 07/27/2000 */
335 if(!IsRegistered(client_p
))
337 /* if its from a possible server connection
338 * ignore it.. more than likely its a header thats sneaked through
341 if(IsAnyServer(client_p
) && !(mptr
->flags
& MFLG_UNREG
))
345 ehandler
= mptr
->handlers
[from
->handler
];
346 handler
= ehandler
.handler
;
348 /* check right amount of params is passed... --is */
349 if(i
< ehandler
.min_para
||
350 (ehandler
.min_para
&& EmptyString(hpara
[ehandler
.min_para
- 1])))
352 if(!IsServer(client_p
))
354 sendto_one(client_p
, form_str(ERR_NEEDMOREPARAMS
),
356 EmptyString(client_p
->name
) ? "*" : client_p
->name
,
358 if(MyClient(client_p
))
364 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
365 "Dropping server %s due to (invalid) command '%s'"
366 " with only %d arguments (expecting %d).",
367 client_p
->name
, mptr
->cmd
, i
, ehandler
.min_para
);
369 "Insufficient parameters (%d < %d) for command '%s' from %s.",
370 i
, ehandler
.min_para
, mptr
->cmd
, client_p
->name
);
371 snprintf(squitreason
, sizeof squitreason
,
372 "Insufficient parameters (%d < %d) for command '%s'",
373 i
, ehandler
.min_para
, mptr
->cmd
);
374 exit_client(client_p
, client_p
, client_p
, squitreason
);
378 (*handler
) (client_p
, from
, i
, hpara
);
383 handle_encap(struct Client
*client_p
, struct Client
*source_p
,
384 const char *command
, int parc
, const char *parv
[])
386 struct Message
*mptr
;
387 struct MessageEntry ehandler
;
388 MessageHandler handler
= 0;
390 parv
[0] = source_p
->name
;
392 mptr
= irc_dictionary_retrieve(cmd_dict
, command
);
394 if(mptr
== NULL
|| mptr
->cmd
== NULL
)
397 ehandler
= mptr
->handlers
[ENCAP_HANDLER
];
398 handler
= ehandler
.handler
;
400 if(parc
< ehandler
.min_para
||
401 (ehandler
.min_para
&& EmptyString(parv
[ehandler
.min_para
- 1])))
404 (*handler
) (client_p
, source_p
, parc
, parv
);
412 * side effects - MUST MUST be called at startup ONCE before
413 * any other keyword hash routine is used.
419 cmd_dict
= irc_dictionary_create(strcasecmp
);
424 * inputs - command name
425 * - pointer to struct Message
427 * side effects - load this one command name
428 * msg->count msg->bytes is modified in place, in
429 * modules address space. Might not want to do that...
432 mod_add_cmd(struct Message
*msg
)
434 s_assert(msg
!= NULL
);
438 if (irc_dictionary_find(cmd_dict
, msg
->cmd
) != NULL
)
445 irc_dictionary_add(cmd_dict
, msg
->cmd
, msg
);
450 * inputs - command name
452 * side effects - unload this one command name
455 mod_del_cmd(struct Message
*msg
)
457 s_assert(msg
!= NULL
);
461 irc_dictionary_delete(cmd_dict
, msg
->cmd
);
467 * inputs - pointer to client to report to
469 * side effects - NONE
472 report_messages(struct Client
*source_p
)
474 struct DictionaryIter iter
;
476 struct alias_entry
*amsg
;
478 IRC_DICTIONARY_FOREACH(msg
, &iter
, cmd_dict
)
480 s_assert(msg
->cmd
!= NULL
);
481 sendto_one_numeric(source_p
, RPL_STATSCOMMANDS
,
482 form_str(RPL_STATSCOMMANDS
),
483 msg
->cmd
, msg
->count
,
484 msg
->bytes
, msg
->rcount
);
487 IRC_DICTIONARY_FOREACH(amsg
, &iter
, alias_dict
)
489 s_assert(amsg
->name
!= NULL
);
490 sendto_one_numeric(source_p
, RPL_STATSCOMMANDS
,
491 form_str(RPL_STATSCOMMANDS
),
492 amsg
->name
, amsg
->hits
, 0, 0);
498 * inputs - client who sent us the message, client with fake
500 * outputs - a given warning about the fake direction
504 cancel_clients(struct Client
*client_p
, struct Client
*source_p
, char *cmd
)
506 /* ok, fake prefix happens naturally during a burst on a nick
507 * collision with TS5, we cant kill them because one client has to
508 * survive, so we just send an error.
510 if(IsServer(source_p
) || IsMe(source_p
))
512 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
513 "Message for %s[%s] from %s",
514 source_p
->name
, source_p
->from
->name
,
515 get_server_name(client_p
, SHOW_IP
));
519 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
520 "Message for %s[%s@%s!%s] from %s (TS, ignored)",
524 source_p
->from
->name
,
525 get_server_name(client_p
, SHOW_IP
));
531 * inputs - client who gave us message, supposed sender, buffer
533 * side effects - kills issued for clients, squits for servers
536 remove_unknown(struct Client
*client_p
, char *lsender
, char *lbuffer
)
538 int slen
= strlen(lsender
);
540 /* meepfoo is a nickname (KILL)
541 * #XXXXXXXX is a UID (KILL)
542 * #XX is a SID (SQUIT)
543 * meep.foo is a server (SQUIT)
545 if((IsDigit(lsender
[0]) && slen
== 3) ||
546 (strchr(lsender
, '.') != NULL
))
548 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
549 "Unknown prefix (%s) from %s, Squitting %s",
550 lbuffer
, get_server_name(client_p
, SHOW_IP
), lsender
);
553 ":%s SQUIT %s :(Unknown prefix (%s) from %s)",
554 get_id(&me
, client_p
), lsender
,
555 lbuffer
, client_p
->name
);
558 sendto_one(client_p
, ":%s KILL %s :%s (Unknown Client)",
559 get_id(&me
, client_p
), lsender
, me
.name
);
566 * parc number of arguments ('sender' counted as one!)
567 * parv[0] pointer to 'sender' (may point to empty string) (not used)
568 * parv[1]..parv[parc-1]
569 * pointers to additional parameters, this is a NULL
570 * terminated list (parv[parc] == NULL).
573 * Numerics are mostly error reports. If there is something
574 * wrong with the message, just *DROP* it! Don't even think of
575 * sending back a neat error message -- big danger of creating
576 * a ping pong error message...
579 do_numeric(char numeric
[], struct Client
*client_p
, struct Client
*source_p
, int parc
, char *parv
[])
581 struct Client
*target_p
;
582 struct Channel
*chptr
;
584 if(parc
< 2 || !IsServer(source_p
))
587 /* Remap low number numerics. */
588 if(numeric
[0] == '0')
592 * Prepare the parameter portion of the message into 'buffer'.
593 * (Because the buffer is twice as large as the message buffer
594 * for the socket, no overflow can occur here... ...on current
595 * assumptions--bets are off, if these are changed --msa)
596 * Note: if buffer is non-empty, it will begin with SPACE.
600 char *t
= buffer
; /* Current position within the buffer */
602 int tl
; /* current length of presently being built string in t */
603 for (i
= 2; i
< (parc
- 1); i
++)
605 tl
= ircsprintf(t
, " %s", parv
[i
]);
608 ircsprintf(t
, " :%s", parv
[parc
- 1]);
611 if((target_p
= find_client(parv
[1])) != NULL
)
616 * We shouldn't get numerics sent to us,
617 * any numerics we do get indicate a bug somewhere..
619 /* ugh. this is here because of nick collisions. when two servers
620 * relink, they burst each other their nicks, then perform collides.
621 * if there is a nick collision, BOTH servers will kill their own
622 * nicks, and BOTH will kill the other servers nick, which wont exist,
623 * because it will have been already killed by the local server.
625 * unfortunately, as we cant guarantee other servers will do the
626 * "right thing" on a nick collision, we have to keep both kills.
627 * ergo we need to ignore ERR_NOSUCHNICK. --fl_
629 /* quick comment. This _was_ tried. i.e. assume the other servers
630 * will do the "right thing" and kill a nick that is colliding.
631 * unfortunately, it did not work. --Dianora
633 /* note, now we send PING on server connect, we can
634 * also get ERR_NOSUCHSERVER..
636 if(atoi(numeric
) != ERR_NOSUCHNICK
&&
637 atoi(numeric
) != ERR_NOSUCHSERVER
)
638 sendto_realops_snomask(SNO_GENERAL
, L_ADMIN
,
639 "*** %s(via %s) sent a %s numeric to me: %s",
641 client_p
->name
, numeric
, buffer
);
644 else if(target_p
->from
== client_p
)
646 /* This message changed direction (nick collision?)
652 /* csircd will send out unknown umode flag for +a (admin), drop it here. */
653 if((atoi(numeric
) == ERR_UMODEUNKNOWNFLAG
) && MyClient(target_p
))
656 /* Fake it for server hiding, if its our client */
657 sendto_one(target_p
, ":%s %s %s%s",
658 get_id(source_p
, target_p
), numeric
,
659 get_id(target_p
, target_p
), buffer
);
662 else if((chptr
= find_channel(parv
[1])) != NULL
)
663 sendto_channel_local(ALL_MEMBERS
, chptr
,
665 source_p
->name
, numeric
, chptr
->chname
, buffer
);
668 static void do_alias(struct alias_entry
*aptr
, struct Client
*source_p
, char *text
)
671 struct Client
*target_p
;
673 if (!IsFloodDone(source_p
) && source_p
->localClient
->receiveM
> 20)
674 flood_endgrace(source_p
);
676 p
= strchr(aptr
->target
, '@');
680 target_p
= find_server(NULL
, p
+ 1);
681 if (target_p
!= NULL
&& IsMe(target_p
))
686 /* nick, must be +S */
687 target_p
= find_named_person(aptr
->target
);
688 if (target_p
!= NULL
&& !IsService(target_p
))
692 if (target_p
== NULL
)
694 sendto_one_numeric(source_p
, ERR_SERVICESDOWN
, form_str(ERR_SERVICESDOWN
), aptr
->target
);
698 if (text
!= NULL
&& *text
== ':')
700 if (text
== NULL
|| *text
== '\0')
702 sendto_one(source_p
, form_str(ERR_NOTEXTTOSEND
), me
.name
, source_p
->name
);
706 /* increment the hitcounter on this alias */
709 sendto_one(target_p
, ":%s PRIVMSG %s :%s",
710 get_id(source_p
, target_p
),
711 p
!= NULL
? aptr
->target
: get_id(target_p
, target_p
),
716 m_not_oper(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
718 sendto_one_numeric(source_p
, ERR_NOPRIVILEGES
, form_str(ERR_NOPRIVILEGES
));
723 m_unregistered(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
726 * I don't =really= want to waste a bit in a flag
727 * number_of_nick_changes is only really valid after the client
728 * is fully registered..
730 if(client_p
->localClient
->number_of_nick_changes
== 0)
732 sendto_one(client_p
, form_str(ERR_NOTREGISTERED
), me
.name
);
733 client_p
->localClient
->number_of_nick_changes
++;
740 m_registered(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
742 sendto_one(client_p
, form_str(ERR_ALREADYREGISTRED
), me
.name
, source_p
->name
);
747 m_ignore(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])