]>
jfr.im git - solanum.git/blob - ircd/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) 2007-2016 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 $
47 static struct Dictionary
*cmd_dict
= NULL
;
48 struct Dictionary
*alias_dict
= NULL
;
50 /* parv[0] is not used, and parv[LAST] == NULL */
51 static char *para
[MAXPARA
+ 2];
53 static void cancel_clients(struct Client
*, struct Client
*);
54 static void remove_unknown(struct Client
*, const char *, char *);
56 static void do_numeric(int, struct Client
*, struct Client
*, int, const char **);
57 static void do_alias(struct alias_entry
*, struct Client
*, char *);
59 static int handle_command(struct Message
*, struct Client
*, struct Client
*, int, const char**);
61 static char buffer
[1024];
63 /* turn a string into a parc/parv pair */
65 char *reconstruct_parv(int parc
, const char *parv
[])
67 static char tmpbuf
[BUFSIZE
]; int i
;
69 rb_strlcpy(tmpbuf
, parv
[0], BUFSIZE
);
70 for (i
= 1; i
< parc
; i
++)
72 rb_strlcat(tmpbuf
, " ", BUFSIZE
);
73 rb_strlcat(tmpbuf
, parv
[i
], BUFSIZE
);
80 * given a raw buffer, parses it and generates parv and parc
83 parse(struct Client
*client_p
, char *pbuffer
, char *bufend
)
85 struct Client
*from
= client_p
;
92 s_assert(MyConnect(client_p
));
93 s_assert(client_p
->localClient
->F
!= NULL
);
94 if(IsAnyDead(client_p
))
99 /* XXX this should be done before parse() is called */
105 res
= msgbuf_parse(&msgbuf
, pbuffer
);
108 ServerStats
.is_empt
++;
112 if (msgbuf
.origin
!= NULL
)
114 from
= find_client(msgbuf
.origin
);
116 /* didnt find any matching client, issue a kill */
119 ServerStats
.is_unpf
++;
120 remove_unknown(client_p
, msgbuf
.origin
, pbuffer
);
124 /* fake direction, hmm. */
125 if(from
->from
!= client_p
)
127 ServerStats
.is_wrdi
++;
128 cancel_clients(client_p
, from
);
133 if(IsDigit(*msgbuf
.cmd
) && IsDigit(*(msgbuf
.cmd
+ 1)) && IsDigit(*(msgbuf
.cmd
+ 2)))
136 numeric
= atoi(msgbuf
.cmd
);
137 ServerStats
.is_num
++;
141 mptr
= irc_dictionary_retrieve(cmd_dict
, msgbuf
.cmd
);
143 /* no command or its encap only, error */
144 if(!mptr
|| !mptr
->cmd
)
146 if (IsPerson(client_p
))
148 struct alias_entry
*aptr
= irc_dictionary_retrieve(alias_dict
, msgbuf
.cmd
);
151 do_alias(aptr
, client_p
, reconstruct_parv(msgbuf
.n_para
- 1, msgbuf
.para
+ 1));
157 sendto_one(from
, form_str(ERR_UNKNOWNCOMMAND
),
158 me
.name
, from
->name
, msgbuf
.cmd
);
160 ServerStats
.is_unco
++;
164 mptr
->bytes
+= msgbuf
.parselen
;
169 do_numeric(numeric
, client_p
, from
, msgbuf
.n_para
, msgbuf
.para
);
173 if(handle_command(mptr
, client_p
, from
, msgbuf
.n_para
, /* XXX discards const!!! */ (const char **)(void *) msgbuf
.para
) < -1)
176 for (p
= pbuffer
; p
<= end
; p
+= 8)
179 /* Its expected this nasty code can be removed
180 * or rewritten later if still needed.
182 if((unsigned long) (p
+ 8) > (unsigned long) end
)
184 for (; p
<= end
; p
++)
186 ilog(L_MAIN
, "%02x |%c", p
[0], p
[0]);
191 "%02x %02x %02x %02x %02x %02x %02x %02x |%c%c%c%c%c%c%c%c",
192 p
[0], p
[1], p
[2], p
[3], p
[4], p
[5],
193 p
[6], p
[7], p
[0], p
[1], p
[2], p
[3], p
[4], p
[5], p
[6], p
[7]);
202 * inputs - pointer to message block
203 * - pointer to client
204 * - pointer to client message is from
205 * - count of number of args
206 * - pointer to argv[] array
207 * output - -1 if error from server
211 handle_command(struct Message
*mptr
, struct Client
*client_p
,
212 struct Client
*from
, int i
, const char** hpara
)
214 struct MessageEntry ehandler
;
215 MessageHandler handler
= 0;
216 char squitreason
[80];
218 if(IsAnyDead(client_p
))
221 if(IsServer(client_p
))
226 /* New patch to avoid server flooding from unregistered connects
227 - Pie-Man 07/27/2000 */
229 if(!IsRegistered(client_p
))
231 /* if its from a possible server connection
232 * ignore it.. more than likely its a header thats sneaked through
235 if(IsAnyServer(client_p
) && !(mptr
->flags
& MFLG_UNREG
))
239 ehandler
= mptr
->handlers
[from
->handler
];
240 handler
= ehandler
.handler
;
242 /* check right amount of params is passed... --is */
243 if(i
< ehandler
.min_para
||
244 (ehandler
.min_para
&& EmptyString(hpara
[ehandler
.min_para
- 1])))
246 if(!IsServer(client_p
))
248 sendto_one(client_p
, form_str(ERR_NEEDMOREPARAMS
),
250 EmptyString(client_p
->name
) ? "*" : client_p
->name
,
252 if(MyClient(client_p
))
258 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
259 "Dropping server %s due to (invalid) command '%s'"
260 " with only %d arguments (expecting %d).",
261 client_p
->name
, mptr
->cmd
, i
, ehandler
.min_para
);
263 "Insufficient parameters (%d < %d) for command '%s' from %s.",
264 i
, ehandler
.min_para
, mptr
->cmd
, client_p
->name
);
265 snprintf(squitreason
, sizeof squitreason
,
266 "Insufficient parameters (%d < %d) for command '%s'",
267 i
, ehandler
.min_para
, mptr
->cmd
);
268 exit_client(client_p
, client_p
, client_p
, squitreason
);
272 (*handler
) (client_p
, from
, i
, hpara
);
277 handle_encap(struct Client
*client_p
, struct Client
*source_p
,
278 const char *command
, int parc
, const char *parv
[])
280 struct Message
*mptr
;
281 struct MessageEntry ehandler
;
282 MessageHandler handler
= 0;
284 mptr
= irc_dictionary_retrieve(cmd_dict
, command
);
286 if(mptr
== NULL
|| mptr
->cmd
== NULL
)
289 ehandler
= mptr
->handlers
[ENCAP_HANDLER
];
290 handler
= ehandler
.handler
;
292 if(parc
< ehandler
.min_para
||
293 (ehandler
.min_para
&& EmptyString(parv
[ehandler
.min_para
- 1])))
296 (*handler
) (client_p
, source_p
, parc
, parv
);
304 * side effects - MUST MUST be called at startup ONCE before
305 * any other keyword hash routine is used.
311 cmd_dict
= irc_dictionary_create("command", strcasecmp
);
316 * inputs - command name
317 * - pointer to struct Message
319 * side effects - load this one command name
320 * msg->count msg->bytes is modified in place, in
321 * modules address space. Might not want to do that...
324 mod_add_cmd(struct Message
*msg
)
326 s_assert(msg
!= NULL
);
330 if (irc_dictionary_find(cmd_dict
, msg
->cmd
) != NULL
)
337 irc_dictionary_add(cmd_dict
, msg
->cmd
, msg
);
342 * inputs - command name
344 * side effects - unload this one command name
347 mod_del_cmd(struct Message
*msg
)
349 s_assert(msg
!= NULL
);
353 irc_dictionary_delete(cmd_dict
, msg
->cmd
);
359 * inputs - pointer to client to report to
361 * side effects - NONE
364 report_messages(struct Client
*source_p
)
366 struct DictionaryIter iter
;
368 struct alias_entry
*amsg
;
370 DICTIONARY_FOREACH(msg
, &iter
, cmd_dict
)
372 s_assert(msg
->cmd
!= NULL
);
373 sendto_one_numeric(source_p
, RPL_STATSCOMMANDS
,
374 form_str(RPL_STATSCOMMANDS
),
375 msg
->cmd
, msg
->count
,
376 msg
->bytes
, msg
->rcount
);
379 DICTIONARY_FOREACH(amsg
, &iter
, alias_dict
)
381 s_assert(amsg
->name
!= NULL
);
382 sendto_one_numeric(source_p
, RPL_STATSCOMMANDS
,
383 form_str(RPL_STATSCOMMANDS
),
384 amsg
->name
, amsg
->hits
, 0L, 0);
390 * inputs - client who sent us the message, client with fake
392 * outputs - a given warning about the fake direction
396 cancel_clients(struct Client
*client_p
, struct Client
*source_p
)
398 /* ok, fake prefix happens naturally during a burst on a nick
399 * collision with TS5, we cant kill them because one client has to
400 * survive, so we just send an error.
402 if(IsServer(source_p
) || IsMe(source_p
))
404 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
405 "Message for %s[%s] from %s",
406 source_p
->name
, source_p
->from
->name
,
411 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
412 "Message for %s[%s@%s!%s] from %s (TS, ignored)",
416 source_p
->from
->name
,
423 * inputs - client who gave us message, supposed sender, buffer
425 * side effects - kills issued for clients, squits for servers
428 remove_unknown(struct Client
*client_p
, const char *lsender
, char *lbuffer
)
430 int slen
= strlen(lsender
);
432 struct Client
*server
;
434 /* meepfoo is a nickname (ignore)
435 * #XXXXXXXX is a UID (KILL)
436 * #XX is a SID (SQUIT)
437 * meep.foo is a server (SQUIT)
439 if((IsDigit(lsender
[0]) && slen
== 3) ||
440 (strchr(lsender
, '.') != NULL
))
442 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
443 "Unknown prefix (%s) from %s, Squitting %s",
444 lbuffer
, client_p
->name
, lsender
);
447 ":%s SQUIT %s :(Unknown prefix (%s) from %s)",
448 get_id(&me
, client_p
), lsender
,
449 lbuffer
, client_p
->name
);
451 else if(!IsDigit(lsender
[0]))
454 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
455 "Invalid prefix (%s) from %s",
456 lbuffer
, client_p
->name
);
459 memcpy(sid
, lsender
, 3);
461 server
= find_server(NULL
, sid
);
462 if (server
!= NULL
&& server
->from
== client_p
)
463 sendto_one(client_p
, ":%s KILL %s :%s (Unknown Client)",
464 get_id(&me
, client_p
), lsender
, me
.name
);
472 * parc number of arguments ('sender' counted as one!)
473 * parv[1]..parv[parc-1]
474 * pointers to additional parameters, this is a NULL
475 * terminated list (parv[parc] == NULL).
478 * Numerics are mostly error reports. If there is something
479 * wrong with the message, just *DROP* it! Don't even think of
480 * sending back a neat error message -- big danger of creating
481 * a ping pong error message...
484 do_numeric(int numeric
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
486 struct Client
*target_p
;
487 struct Channel
*chptr
;
489 if(parc
< 2 || !IsServer(source_p
))
492 /* Remap low number numerics. */
497 * Prepare the parameter portion of the message into 'buffer'.
498 * (Because the buffer is twice as large as the message buffer
499 * for the socket, no overflow can occur here... ...on current
500 * assumptions--bets are off, if these are changed --msa)
501 * Note: if buffer is non-empty, it will begin with SPACE.
505 char *t
= buffer
; /* Current position within the buffer */
507 int tl
; /* current length of presently being built string in t */
508 for (i
= 2; i
< (parc
- 1); i
++)
510 tl
= sprintf(t
, " %s", parv
[i
]);
513 sprintf(t
, " :%s", parv
[parc
- 1]);
516 if((target_p
= find_client(parv
[1])) != NULL
)
521 * We shouldn't get numerics sent to us,
522 * any numerics we do get indicate a bug somewhere..
524 /* ugh. this is here because of nick collisions. when two servers
525 * relink, they burst each other their nicks, then perform collides.
526 * if there is a nick collision, BOTH servers will kill their own
527 * nicks, and BOTH will kill the other servers nick, which wont exist,
528 * because it will have been already killed by the local server.
530 * unfortunately, as we cant guarantee other servers will do the
531 * "right thing" on a nick collision, we have to keep both kills.
532 * ergo we need to ignore ERR_NOSUCHNICK. --fl_
534 /* quick comment. This _was_ tried. i.e. assume the other servers
535 * will do the "right thing" and kill a nick that is colliding.
536 * unfortunately, it did not work. --Dianora
538 /* note, now we send PING on server connect, we can
539 * also get ERR_NOSUCHSERVER..
541 if(numeric
!= ERR_NOSUCHNICK
&&
542 numeric
!= ERR_NOSUCHSERVER
)
543 sendto_realops_snomask(SNO_GENERAL
, L_ADMIN
,
544 "*** %s(via %s) sent a %03d numeric to me: %s",
546 client_p
->name
, numeric
, buffer
);
549 else if(target_p
->from
== client_p
)
551 /* This message changed direction (nick collision?)
557 /* csircd will send out unknown umode flag for +a (admin), drop it here. */
558 if(numeric
== ERR_UMODEUNKNOWNFLAG
&& MyClient(target_p
))
561 /* Fake it for server hiding, if its our client */
562 sendto_one(target_p
, ":%s %03d %s%s",
563 get_id(source_p
, target_p
), numeric
,
564 get_id(target_p
, target_p
), buffer
);
567 else if((chptr
= find_channel(parv
[1])) != NULL
)
568 sendto_channel_flags(client_p
, ALL_MEMBERS
, source_p
, chptr
,
570 numeric
, chptr
->chname
, buffer
);
573 static void do_alias(struct alias_entry
*aptr
, struct Client
*source_p
, char *text
)
576 struct Client
*target_p
;
578 if (!IsFloodDone(source_p
) && source_p
->localClient
->receiveM
> 20)
579 flood_endgrace(source_p
);
581 p
= strchr(aptr
->target
, '@');
585 target_p
= find_server(NULL
, p
+ 1);
586 if (target_p
!= NULL
&& IsMe(target_p
))
591 /* nick, must be +S */
592 target_p
= find_named_person(aptr
->target
);
593 if (target_p
!= NULL
&& !IsService(target_p
))
597 if (target_p
== NULL
)
599 sendto_one_numeric(source_p
, ERR_SERVICESDOWN
, form_str(ERR_SERVICESDOWN
), aptr
->target
);
603 if (text
!= NULL
&& *text
== ':')
605 if (text
== NULL
|| *text
== '\0')
607 sendto_one(source_p
, form_str(ERR_NOTEXTTOSEND
), me
.name
, source_p
->name
);
611 /* increment the hitcounter on this alias */
614 sendto_one(target_p
, ":%s PRIVMSG %s :%s",
615 get_id(source_p
, target_p
),
616 p
!= NULL
? aptr
->target
: get_id(target_p
, target_p
),
621 m_not_oper(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
623 sendto_one_numeric(source_p
, ERR_NOPRIVILEGES
, form_str(ERR_NOPRIVILEGES
));
628 m_unregistered(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
631 * I don't =really= want to waste a bit in a flag
632 * number_of_nick_changes is only really valid after the client
633 * is fully registered..
635 if(client_p
->localClient
->number_of_nick_changes
== 0)
637 sendto_one(client_p
, form_str(ERR_NOTREGISTERED
), me
.name
);
638 client_p
->localClient
->number_of_nick_changes
++;
645 m_registered(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
647 sendto_one(client_p
, form_str(ERR_ALREADYREGISTRED
), me
.name
, source_p
->name
);
652 m_ignore(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])