]>
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 MsgBuf
*, struct Client
*, struct Client
*);
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
, &msgbuf
, client_p
, from
) < -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 message buffer
204 * - pointer to client
205 * - pointer to client message is from
206 * output - -1 if error from server
210 handle_command(struct Message
*mptr
, struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*from
)
212 struct MessageEntry ehandler
;
213 MessageHandler handler
= 0;
214 char squitreason
[80];
216 if(IsAnyDead(client_p
))
219 if(IsServer(client_p
))
224 ehandler
= mptr
->handlers
[from
->handler
];
225 handler
= ehandler
.handler
;
227 /* check right amount of params is passed... --is */
228 if(msgbuf_p
->n_para
< ehandler
.min_para
||
229 (ehandler
.min_para
&& EmptyString(msgbuf_p
->para
[ehandler
.min_para
- 1])))
231 if(!IsServer(client_p
))
233 sendto_one(client_p
, form_str(ERR_NEEDMOREPARAMS
),
235 EmptyString(client_p
->name
) ? "*" : client_p
->name
,
237 if(MyClient(client_p
))
243 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
244 "Dropping server %s due to (invalid) command '%s'"
245 " with only %zu arguments (expecting %d).",
246 client_p
->name
, mptr
->cmd
, msgbuf_p
->n_para
, ehandler
.min_para
);
248 "Insufficient parameters (%zu < %d) for command '%s' from %s.",
249 msgbuf_p
->n_para
, ehandler
.min_para
, mptr
->cmd
, client_p
->name
);
250 snprintf(squitreason
, sizeof squitreason
,
251 "Insufficient parameters (%zu < %d) for command '%s'",
252 msgbuf_p
->n_para
, ehandler
.min_para
, mptr
->cmd
);
253 exit_client(client_p
, client_p
, client_p
, squitreason
);
257 (*handler
) (msgbuf_p
, client_p
, from
, msgbuf_p
->n_para
, msgbuf_p
->para
);
262 handle_encap(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
,
263 const char *command
, int parc
, const char *parv
[])
265 struct Message
*mptr
;
266 struct MessageEntry ehandler
;
267 MessageHandler handler
= 0;
269 mptr
= irc_dictionary_retrieve(cmd_dict
, command
);
271 if(mptr
== NULL
|| mptr
->cmd
== NULL
)
274 ehandler
= mptr
->handlers
[ENCAP_HANDLER
];
275 handler
= ehandler
.handler
;
277 if(parc
< ehandler
.min_para
||
278 (ehandler
.min_para
&& EmptyString(parv
[ehandler
.min_para
- 1])))
281 (*handler
) (msgbuf_p
, client_p
, source_p
, parc
, parv
);
289 * side effects - MUST MUST be called at startup ONCE before
290 * any other keyword hash routine is used.
296 cmd_dict
= irc_dictionary_create("command", strcasecmp
);
301 * inputs - command name
302 * - pointer to struct Message
304 * side effects - load this one command name
305 * msg->count msg->bytes is modified in place, in
306 * modules address space. Might not want to do that...
309 mod_add_cmd(struct Message
*msg
)
311 s_assert(msg
!= NULL
);
315 if (irc_dictionary_find(cmd_dict
, msg
->cmd
) != NULL
)
322 irc_dictionary_add(cmd_dict
, msg
->cmd
, msg
);
327 * inputs - command name
329 * side effects - unload this one command name
332 mod_del_cmd(struct Message
*msg
)
334 s_assert(msg
!= NULL
);
338 irc_dictionary_delete(cmd_dict
, msg
->cmd
);
344 * inputs - pointer to client to report to
346 * side effects - NONE
349 report_messages(struct Client
*source_p
)
351 struct DictionaryIter iter
;
353 struct alias_entry
*amsg
;
355 DICTIONARY_FOREACH(msg
, &iter
, cmd_dict
)
357 s_assert(msg
->cmd
!= NULL
);
358 sendto_one_numeric(source_p
, RPL_STATSCOMMANDS
,
359 form_str(RPL_STATSCOMMANDS
),
360 msg
->cmd
, msg
->count
,
361 msg
->bytes
, msg
->rcount
);
364 DICTIONARY_FOREACH(amsg
, &iter
, alias_dict
)
366 s_assert(amsg
->name
!= NULL
);
367 sendto_one_numeric(source_p
, RPL_STATSCOMMANDS
,
368 form_str(RPL_STATSCOMMANDS
),
369 amsg
->name
, amsg
->hits
, 0L, 0);
375 * inputs - client who sent us the message, client with fake
377 * outputs - a given warning about the fake direction
381 cancel_clients(struct Client
*client_p
, struct Client
*source_p
)
383 /* ok, fake prefix happens naturally during a burst on a nick
384 * collision with TS5, we cant kill them because one client has to
385 * survive, so we just send an error.
387 if(IsServer(source_p
) || IsMe(source_p
))
389 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
390 "Message for %s[%s] from %s",
391 source_p
->name
, source_p
->from
->name
,
396 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
397 "Message for %s[%s@%s!%s] from %s (TS, ignored)",
401 source_p
->from
->name
,
408 * inputs - client who gave us message, supposed sender, buffer
410 * side effects - kills issued for clients, squits for servers
413 remove_unknown(struct Client
*client_p
, const char *lsender
, char *lbuffer
)
415 int slen
= strlen(lsender
);
417 struct Client
*server
;
419 /* meepfoo is a nickname (ignore)
420 * #XXXXXXXX is a UID (KILL)
421 * #XX is a SID (SQUIT)
422 * meep.foo is a server (SQUIT)
424 if((IsDigit(lsender
[0]) && slen
== 3) ||
425 (strchr(lsender
, '.') != NULL
))
427 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
428 "Unknown prefix (%s) from %s, Squitting %s",
429 lbuffer
, client_p
->name
, lsender
);
432 ":%s SQUIT %s :(Unknown prefix (%s) from %s)",
433 get_id(&me
, client_p
), lsender
,
434 lbuffer
, client_p
->name
);
436 else if(!IsDigit(lsender
[0]))
439 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
440 "Invalid prefix (%s) from %s",
441 lbuffer
, client_p
->name
);
444 memcpy(sid
, lsender
, 3);
446 server
= find_server(NULL
, sid
);
447 if (server
!= NULL
&& server
->from
== client_p
)
448 sendto_one(client_p
, ":%s KILL %s :%s (Unknown Client)",
449 get_id(&me
, client_p
), lsender
, me
.name
);
457 * parc number of arguments ('sender' counted as one!)
458 * parv[1]..parv[parc-1]
459 * pointers to additional parameters, this is a NULL
460 * terminated list (parv[parc] == NULL).
463 * Numerics are mostly error reports. If there is something
464 * wrong with the message, just *DROP* it! Don't even think of
465 * sending back a neat error message -- big danger of creating
466 * a ping pong error message...
469 do_numeric(int numeric
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
471 struct Client
*target_p
;
472 struct Channel
*chptr
;
474 if(parc
< 2 || !IsServer(source_p
))
477 /* Remap low number numerics. */
482 * Prepare the parameter portion of the message into 'buffer'.
483 * (Because the buffer is twice as large as the message buffer
484 * for the socket, no overflow can occur here... ...on current
485 * assumptions--bets are off, if these are changed --msa)
486 * Note: if buffer is non-empty, it will begin with SPACE.
490 char *t
= buffer
; /* Current position within the buffer */
492 int tl
; /* current length of presently being built string in t */
493 for (i
= 2; i
< (parc
- 1); i
++)
495 tl
= sprintf(t
, " %s", parv
[i
]);
498 sprintf(t
, " :%s", parv
[parc
- 1]);
501 if((target_p
= find_client(parv
[1])) != NULL
)
506 * We shouldn't get numerics sent to us,
507 * any numerics we do get indicate a bug somewhere..
509 /* ugh. this is here because of nick collisions. when two servers
510 * relink, they burst each other their nicks, then perform collides.
511 * if there is a nick collision, BOTH servers will kill their own
512 * nicks, and BOTH will kill the other servers nick, which wont exist,
513 * because it will have been already killed by the local server.
515 * unfortunately, as we cant guarantee other servers will do the
516 * "right thing" on a nick collision, we have to keep both kills.
517 * ergo we need to ignore ERR_NOSUCHNICK. --fl_
519 /* quick comment. This _was_ tried. i.e. assume the other servers
520 * will do the "right thing" and kill a nick that is colliding.
521 * unfortunately, it did not work. --Dianora
523 /* note, now we send PING on server connect, we can
524 * also get ERR_NOSUCHSERVER..
526 if(numeric
!= ERR_NOSUCHNICK
&&
527 numeric
!= ERR_NOSUCHSERVER
)
528 sendto_realops_snomask(SNO_GENERAL
, L_ADMIN
,
529 "*** %s(via %s) sent a %03d numeric to me: %s",
531 client_p
->name
, numeric
, buffer
);
534 else if(target_p
->from
== client_p
)
536 /* This message changed direction (nick collision?)
542 /* csircd will send out unknown umode flag for +a (admin), drop it here. */
543 if(numeric
== ERR_UMODEUNKNOWNFLAG
&& MyClient(target_p
))
546 /* Fake it for server hiding, if its our client */
547 sendto_one(target_p
, ":%s %03d %s%s",
548 get_id(source_p
, target_p
), numeric
,
549 get_id(target_p
, target_p
), buffer
);
552 else if((chptr
= find_channel(parv
[1])) != NULL
)
553 sendto_channel_flags(client_p
, ALL_MEMBERS
, source_p
, chptr
,
555 numeric
, chptr
->chname
, buffer
);
558 static void do_alias(struct alias_entry
*aptr
, struct Client
*source_p
, char *text
)
561 struct Client
*target_p
;
563 if (!IsFloodDone(source_p
) && source_p
->localClient
->receiveM
> 20)
564 flood_endgrace(source_p
);
566 p
= strchr(aptr
->target
, '@');
570 target_p
= find_server(NULL
, p
+ 1);
571 if (target_p
!= NULL
&& IsMe(target_p
))
576 /* nick, must be +S */
577 target_p
= find_named_person(aptr
->target
);
578 if (target_p
!= NULL
&& !IsService(target_p
))
582 if (target_p
== NULL
)
584 sendto_one_numeric(source_p
, ERR_SERVICESDOWN
, form_str(ERR_SERVICESDOWN
), aptr
->target
);
588 if (text
!= NULL
&& *text
== ':')
590 if (text
== NULL
|| *text
== '\0')
592 sendto_one(source_p
, form_str(ERR_NOTEXTTOSEND
), me
.name
, source_p
->name
);
596 /* increment the hitcounter on this alias */
599 sendto_one(target_p
, ":%s PRIVMSG %s :%s",
600 get_id(source_p
, target_p
),
601 p
!= NULL
? aptr
->target
: get_id(target_p
, target_p
),
606 m_not_oper(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
608 sendto_one_numeric(source_p
, ERR_NOPRIVILEGES
, form_str(ERR_NOPRIVILEGES
));
613 m_unregistered(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
616 * I don't =really= want to waste a bit in a flag
617 * number_of_nick_changes is only really valid after the client
618 * is fully registered..
620 if(client_p
->localClient
->number_of_nick_changes
== 0)
622 sendto_one(client_p
, form_str(ERR_NOTREGISTERED
), me
.name
);
623 client_p
->localClient
->number_of_nick_changes
++;
630 m_registered(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
632 sendto_one(client_p
, form_str(ERR_ALREADYREGISTRED
), me
.name
, source_p
->name
);
637 m_ignore(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])