]>
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 char buffer
[1024];
68 /* turn a string into a parc/parv pair */
72 string_to_array(char *string
, char **parv
)
74 char *p
, *buf
= string
;
78 while (*buf
== ' ') /* skip leading spaces */
80 if(*buf
== '\0') /* ignore all-space args */
85 if(*buf
== ':') /* Last parameter */
96 if((p
= strchr(buf
, ' ')) != NULL
)
109 /* we can go upto parv[MAXPARA], as parv[0] is taken by source */
122 * given a raw buffer, parses it and generates parv, parc and sender
125 parse(struct Client
*client_p
, char *pbuffer
, char *bufend
)
127 struct Client
*from
= client_p
;
133 struct Message
*mptr
;
135 s_assert(MyConnect(client_p
));
136 s_assert(client_p
->localClient
->F
->fd
>= 0);
137 if(IsAnyDead(client_p
))
140 for (ch
= pbuffer
; *ch
== ' '; ch
++) /* skip spaces */
141 /* null statement */ ;
143 para
[0] = from
->name
;
149 /* point sender to the sender param */
152 if((s
= strchr(ch
, ' ')))
159 if(*sender
&& IsServer(client_p
))
161 from
= find_client(sender
);
163 /* didnt find any matching client, issue a kill */
166 ServerStats
->is_unpf
++;
167 remove_unknown(client_p
, sender
, pbuffer
);
171 para
[0] = from
->name
;
173 /* fake direction, hmm. */
174 if(from
->from
!= client_p
)
176 ServerStats
->is_wrdi
++;
177 cancel_clients(client_p
, from
, pbuffer
);
187 ServerStats
->is_empt
++;
191 /* at this point there must be some sort of command parameter */
194 * Extract the command code from the packet. Point s to the end
195 * of the command code and calculate the length using pointer
196 * arithmetic. Note: only need length for numerics and *all*
197 * numerics must have parameters and thus a space after the command
201 /* EOB is 3 chars long but is not a numeric */
203 if(*(ch
+ 3) == ' ' && /* ok, lets see if its a possible numeric.. */
204 IsDigit(*ch
) && IsDigit(*(ch
+ 1)) && IsDigit(*(ch
+ 2)))
208 ServerStats
->is_num
++;
209 s
= ch
+ 3; /* I know this is ' ' from above if */
210 *s
++ = '\0'; /* blow away the ' ', and point s to next part */
216 if((s
= strchr(ch
, ' ')))
219 mptr
= irc_dictionary_retrieve(cmd_dict
, ch
);
221 /* no command or its encap only, error */
222 if(!mptr
|| !mptr
->cmd
)
225 * Note: Give error message *only* to recognized
226 * persons. It's a nightmare situation to have
227 * two programs sending "Unknown command"'s or
228 * equivalent to each other at full blast....
229 * If it has got to person state, it at least
230 * seems to be well behaving. Perhaps this message
231 * should never be generated, though... --msa
232 * Hm, when is the buffer empty -- if a command
233 * code has been found ?? -Armin
235 if(pbuffer
[0] != '\0')
237 if (IsPerson(client_p
))
239 struct alias_entry
*aptr
= irc_dictionary_retrieve(alias_dict
, ch
);
242 do_alias(aptr
, client_p
, s
);
248 sendto_one(from
, form_str(ERR_UNKNOWNCOMMAND
),
249 me
.name
, from
->name
, ch
);
252 ServerStats
->is_unco
++;
256 ii
= bufend
- ((s
) ? s
: ch
);
262 /* XXX this should be done before parse() is called */
269 i
= string_to_array(s
, para
);
273 do_numeric(numeric
, client_p
, from
, i
, para
);
277 if(handle_command(mptr
, client_p
, from
, i
, /* XXX discards const!!! */ (const char **)para
) < -1)
280 for (p
= pbuffer
; p
<= end
; p
+= 8)
283 /* Its expected this nasty code can be removed
284 * or rewritten later if still needed.
286 if((unsigned long) (p
+ 8) > (unsigned long) end
)
288 for (; p
<= end
; p
++)
290 ilog(L_MAIN
, "%02x |%c", p
[0], p
[0]);
295 "%02x %02x %02x %02x %02x %02x %02x %02x |%c%c%c%c%c%c%c%c",
296 p
[0], p
[1], p
[2], p
[3], p
[4], p
[5],
297 p
[6], p
[7], p
[0], p
[1], p
[2], p
[3], p
[4], p
[5], p
[6], p
[7]);
306 * inputs - pointer to message block
307 * - pointer to client
308 * - pointer to client message is from
309 * - count of number of args
310 * - pointer to argv[] array
311 * output - -1 if error from server
315 handle_command(struct Message
*mptr
, struct Client
*client_p
,
316 struct Client
*from
, int i
, const char** hpara
)
318 struct MessageEntry ehandler
;
319 MessageHandler handler
= 0;
320 char squitreason
[80];
322 if(IsAnyDead(client_p
))
325 if(IsServer(client_p
))
330 /* New patch to avoid server flooding from unregistered connects
331 - Pie-Man 07/27/2000 */
333 if(!IsRegistered(client_p
))
335 /* if its from a possible server connection
336 * ignore it.. more than likely its a header thats sneaked through
339 if(IsAnyServer(client_p
) && !(mptr
->flags
& MFLG_UNREG
))
343 ehandler
= mptr
->handlers
[from
->handler
];
344 handler
= ehandler
.handler
;
346 /* check right amount of params is passed... --is */
347 if(i
< ehandler
.min_para
||
348 (ehandler
.min_para
&& EmptyString(hpara
[ehandler
.min_para
- 1])))
350 if(!IsServer(client_p
))
352 sendto_one(client_p
, form_str(ERR_NEEDMOREPARAMS
),
354 EmptyString(client_p
->name
) ? "*" : client_p
->name
,
356 if(MyClient(client_p
))
362 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
363 "Dropping server %s due to (invalid) command '%s'"
364 " with only %d arguments (expecting %d).",
365 client_p
->name
, mptr
->cmd
, i
, ehandler
.min_para
);
367 "Insufficient parameters (%d < %d) for command '%s' from %s.",
368 i
, ehandler
.min_para
, mptr
->cmd
, client_p
->name
);
369 snprintf(squitreason
, sizeof squitreason
,
370 "Insufficient parameters (%d < %d) for command '%s'",
371 i
, ehandler
.min_para
, mptr
->cmd
);
372 exit_client(client_p
, client_p
, client_p
, squitreason
);
376 (*handler
) (client_p
, from
, i
, hpara
);
381 handle_encap(struct Client
*client_p
, struct Client
*source_p
,
382 const char *command
, int parc
, const char *parv
[])
384 struct Message
*mptr
;
385 struct MessageEntry ehandler
;
386 MessageHandler handler
= 0;
388 parv
[0] = source_p
->name
;
390 mptr
= irc_dictionary_retrieve(cmd_dict
, command
);
392 if(mptr
== NULL
|| mptr
->cmd
== NULL
)
395 ehandler
= mptr
->handlers
[ENCAP_HANDLER
];
396 handler
= ehandler
.handler
;
398 if(parc
< ehandler
.min_para
||
399 (ehandler
.min_para
&& EmptyString(parv
[ehandler
.min_para
- 1])))
402 (*handler
) (client_p
, source_p
, parc
, parv
);
410 * side effects - MUST MUST be called at startup ONCE before
411 * any other keyword hash routine is used.
417 cmd_dict
= irc_dictionary_create(strcasecmp
);
422 * inputs - command name
423 * - pointer to struct Message
425 * side effects - load this one command name
426 * msg->count msg->bytes is modified in place, in
427 * modules address space. Might not want to do that...
430 mod_add_cmd(struct Message
*msg
)
432 s_assert(msg
!= NULL
);
436 if (irc_dictionary_find(cmd_dict
, msg
->cmd
) != NULL
)
443 irc_dictionary_add(cmd_dict
, msg
->cmd
, msg
);
448 * inputs - command name
450 * side effects - unload this one command name
453 mod_del_cmd(struct Message
*msg
)
455 s_assert(msg
!= NULL
);
459 irc_dictionary_delete(cmd_dict
, msg
->cmd
);
465 * inputs - pointer to client to report to
467 * side effects - NONE
470 report_messages(struct Client
*source_p
)
472 struct DictionaryIter iter
;
474 struct alias_entry
*amsg
;
476 DICTIONARY_FOREACH(msg
, &iter
, cmd_dict
)
478 s_assert(msg
->cmd
!= NULL
);
479 sendto_one_numeric(source_p
, RPL_STATSCOMMANDS
,
480 form_str(RPL_STATSCOMMANDS
),
481 msg
->cmd
, msg
->count
,
482 msg
->bytes
, msg
->rcount
);
485 DICTIONARY_FOREACH(amsg
, &iter
, alias_dict
)
487 s_assert(amsg
->name
!= NULL
);
488 sendto_one_numeric(source_p
, RPL_STATSCOMMANDS
,
489 form_str(RPL_STATSCOMMANDS
),
490 amsg
->name
, amsg
->hits
, 0, 0);
496 * inputs - client who sent us the message, client with fake
498 * outputs - a given warning about the fake direction
502 cancel_clients(struct Client
*client_p
, struct Client
*source_p
, char *cmd
)
504 /* ok, fake prefix happens naturally during a burst on a nick
505 * collision with TS5, we cant kill them because one client has to
506 * survive, so we just send an error.
508 if(IsServer(source_p
) || IsMe(source_p
))
510 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
511 "Message for %s[%s] from %s",
512 source_p
->name
, source_p
->from
->name
,
513 get_server_name(client_p
, SHOW_IP
));
517 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
518 "Message for %s[%s@%s!%s] from %s (TS, ignored)",
522 source_p
->from
->name
,
523 get_server_name(client_p
, SHOW_IP
));
529 * inputs - client who gave us message, supposed sender, buffer
531 * side effects - kills issued for clients, squits for servers
534 remove_unknown(struct Client
*client_p
, char *lsender
, char *lbuffer
)
536 int slen
= strlen(lsender
);
538 /* meepfoo is a nickname (KILL)
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
, get_server_name(client_p
, SHOW_IP
), lsender
);
551 ":%s SQUIT %s :(Unknown prefix (%s) from %s)",
552 get_id(&me
, client_p
), lsender
,
553 lbuffer
, client_p
->name
);
556 sendto_one(client_p
, ":%s KILL %s :%s (Unknown Client)",
557 get_id(&me
, client_p
), lsender
, me
.name
);
564 * parc number of arguments ('sender' counted as one!)
565 * parv[0] pointer to 'sender' (may point to empty string) (not used)
566 * parv[1]..parv[parc-1]
567 * pointers to additional parameters, this is a NULL
568 * terminated list (parv[parc] == NULL).
571 * Numerics are mostly error reports. If there is something
572 * wrong with the message, just *DROP* it! Don't even think of
573 * sending back a neat error message -- big danger of creating
574 * a ping pong error message...
577 do_numeric(char numeric
[], struct Client
*client_p
, struct Client
*source_p
, int parc
, char *parv
[])
579 struct Client
*target_p
;
580 struct Channel
*chptr
;
582 if(parc
< 2 || !IsServer(source_p
))
585 /* Remap low number numerics. */
586 if(numeric
[0] == '0')
590 * Prepare the parameter portion of the message into 'buffer'.
591 * (Because the buffer is twice as large as the message buffer
592 * for the socket, no overflow can occur here... ...on current
593 * assumptions--bets are off, if these are changed --msa)
594 * Note: if buffer is non-empty, it will begin with SPACE.
598 char *t
= buffer
; /* Current position within the buffer */
600 int tl
; /* current length of presently being built string in t */
601 for (i
= 2; i
< (parc
- 1); i
++)
603 tl
= ircsprintf(t
, " %s", parv
[i
]);
606 ircsprintf(t
, " :%s", parv
[parc
- 1]);
609 if((target_p
= find_client(parv
[1])) != NULL
)
614 * We shouldn't get numerics sent to us,
615 * any numerics we do get indicate a bug somewhere..
617 /* ugh. this is here because of nick collisions. when two servers
618 * relink, they burst each other their nicks, then perform collides.
619 * if there is a nick collision, BOTH servers will kill their own
620 * nicks, and BOTH will kill the other servers nick, which wont exist,
621 * because it will have been already killed by the local server.
623 * unfortunately, as we cant guarantee other servers will do the
624 * "right thing" on a nick collision, we have to keep both kills.
625 * ergo we need to ignore ERR_NOSUCHNICK. --fl_
627 /* quick comment. This _was_ tried. i.e. assume the other servers
628 * will do the "right thing" and kill a nick that is colliding.
629 * unfortunately, it did not work. --Dianora
631 /* note, now we send PING on server connect, we can
632 * also get ERR_NOSUCHSERVER..
634 if(atoi(numeric
) != ERR_NOSUCHNICK
&&
635 atoi(numeric
) != ERR_NOSUCHSERVER
)
636 sendto_realops_snomask(SNO_GENERAL
, L_ADMIN
,
637 "*** %s(via %s) sent a %s numeric to me: %s",
639 client_p
->name
, numeric
, buffer
);
642 else if(target_p
->from
== client_p
)
644 /* This message changed direction (nick collision?)
650 /* csircd will send out unknown umode flag for +a (admin), drop it here. */
651 if((atoi(numeric
) == ERR_UMODEUNKNOWNFLAG
) && MyClient(target_p
))
654 /* Fake it for server hiding, if its our client */
655 sendto_one(target_p
, ":%s %s %s%s",
656 get_id(source_p
, target_p
), numeric
,
657 get_id(target_p
, target_p
), buffer
);
660 else if((chptr
= find_channel(parv
[1])) != NULL
)
661 sendto_channel_flags(client_p
, ALL_MEMBERS
, source_p
, chptr
,
663 numeric
, chptr
->chname
, buffer
);
666 static void do_alias(struct alias_entry
*aptr
, struct Client
*source_p
, char *text
)
669 struct Client
*target_p
;
671 if (!IsFloodDone(source_p
) && source_p
->localClient
->receiveM
> 20)
672 flood_endgrace(source_p
);
674 p
= strchr(aptr
->target
, '@');
678 target_p
= find_server(NULL
, p
+ 1);
679 if (target_p
!= NULL
&& IsMe(target_p
))
684 /* nick, must be +S */
685 target_p
= find_named_person(aptr
->target
);
686 if (target_p
!= NULL
&& !IsService(target_p
))
690 if (target_p
== NULL
)
692 sendto_one_numeric(source_p
, ERR_SERVICESDOWN
, form_str(ERR_SERVICESDOWN
), aptr
->target
);
696 if (text
!= NULL
&& *text
== ':')
698 if (text
== NULL
|| *text
== '\0')
700 sendto_one(source_p
, form_str(ERR_NOTEXTTOSEND
), me
.name
, source_p
->name
);
704 /* increment the hitcounter on this alias */
707 sendto_one(target_p
, ":%s PRIVMSG %s :%s",
708 get_id(source_p
, target_p
),
709 p
!= NULL
? aptr
->target
: get_id(target_p
, target_p
),
714 m_not_oper(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
716 sendto_one_numeric(source_p
, ERR_NOPRIVILEGES
, form_str(ERR_NOPRIVILEGES
));
721 m_unregistered(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
724 * I don't =really= want to waste a bit in a flag
725 * number_of_nick_changes is only really valid after the client
726 * is fully registered..
728 if(client_p
->localClient
->number_of_nick_changes
== 0)
730 sendto_one(client_p
, form_str(ERR_NOTREGISTERED
), me
.name
);
731 client_p
->localClient
->number_of_nick_changes
++;
738 m_registered(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
740 sendto_one(client_p
, form_str(ERR_ALREADYREGISTRED
), me
.name
, source_p
->name
);
745 m_ignore(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])