]>
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 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
);
343 * inputs - client who sent us the message, client with fake
345 * outputs - a given warning about the fake direction
349 cancel_clients(struct Client
*client_p
, struct Client
*source_p
)
351 /* ok, fake prefix happens naturally during a burst on a nick
352 * collision with TS5, we cant kill them because one client has to
353 * survive, so we just send an error.
355 if(IsServer(source_p
) || IsMe(source_p
))
357 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
358 "Message for %s[%s] from %s",
359 source_p
->name
, source_p
->from
->name
,
364 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
365 "Message for %s[%s@%s!%s] from %s (TS, ignored)",
369 source_p
->from
->name
,
376 * inputs - client who gave us message, supposed sender, buffer
378 * side effects - kills issued for clients, squits for servers
381 remove_unknown(struct Client
*client_p
, const char *lsender
, char *lbuffer
)
383 int slen
= strlen(lsender
);
385 struct Client
*server
;
387 /* meepfoo is a nickname (ignore)
388 * #XXXXXXXX is a UID (KILL)
389 * #XX is a SID (SQUIT)
390 * meep.foo is a server (SQUIT)
392 if((IsDigit(lsender
[0]) && slen
== 3) ||
393 (strchr(lsender
, '.') != NULL
))
395 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
396 "Unknown prefix (%s) from %s, Squitting %s",
397 lbuffer
, client_p
->name
, lsender
);
400 ":%s SQUIT %s :(Unknown prefix (%s) from %s)",
401 get_id(&me
, client_p
), lsender
,
402 lbuffer
, client_p
->name
);
404 else if(!IsDigit(lsender
[0]))
407 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
408 "Invalid prefix (%s) from %s",
409 lbuffer
, client_p
->name
);
412 memcpy(sid
, lsender
, 3);
414 server
= find_server(NULL
, sid
);
415 if (server
!= NULL
&& server
->from
== client_p
)
416 sendto_one(client_p
, ":%s KILL %s :%s (Unknown Client)",
417 get_id(&me
, client_p
), lsender
, me
.name
);
425 * parc number of arguments ('sender' counted as one!)
426 * parv[1]..parv[parc-1]
427 * pointers to additional parameters, this is a NULL
428 * terminated list (parv[parc] == NULL).
431 * Numerics are mostly error reports. If there is something
432 * wrong with the message, just *DROP* it! Don't even think of
433 * sending back a neat error message -- big danger of creating
434 * a ping pong error message...
437 do_numeric(int numeric
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
439 struct Client
*target_p
;
440 struct Channel
*chptr
;
442 if(parc
< 2 || !IsServer(source_p
))
445 /* Remap low number numerics. */
450 * Prepare the parameter portion of the message into 'buffer'.
451 * (Because the buffer is twice as large as the message buffer
452 * for the socket, no overflow can occur here... ...on current
453 * assumptions--bets are off, if these are changed --msa)
454 * Note: if buffer is non-empty, it will begin with SPACE.
458 char *t
= buffer
; /* Current position within the buffer */
460 int tl
; /* current length of presently being built string in t */
461 for (i
= 2; i
< (parc
- 1); i
++)
463 tl
= sprintf(t
, " %s", parv
[i
]);
466 sprintf(t
, " :%s", parv
[parc
- 1]);
469 if((target_p
= find_client(parv
[1])) != NULL
)
474 * We shouldn't get numerics sent to us,
475 * any numerics we do get indicate a bug somewhere..
477 /* ugh. this is here because of nick collisions. when two servers
478 * relink, they burst each other their nicks, then perform collides.
479 * if there is a nick collision, BOTH servers will kill their own
480 * nicks, and BOTH will kill the other servers nick, which wont exist,
481 * because it will have been already killed by the local server.
483 * unfortunately, as we cant guarantee other servers will do the
484 * "right thing" on a nick collision, we have to keep both kills.
485 * ergo we need to ignore ERR_NOSUCHNICK. --fl_
487 /* quick comment. This _was_ tried. i.e. assume the other servers
488 * will do the "right thing" and kill a nick that is colliding.
489 * unfortunately, it did not work. --Dianora
491 /* note, now we send PING on server connect, we can
492 * also get ERR_NOSUCHSERVER..
494 if(numeric
!= ERR_NOSUCHNICK
&&
495 numeric
!= ERR_NOSUCHSERVER
)
496 sendto_realops_snomask(SNO_GENERAL
, L_ADMIN
,
497 "*** %s(via %s) sent a %03d numeric to me: %s",
499 client_p
->name
, numeric
, buffer
);
502 else if(target_p
->from
== client_p
)
504 /* This message changed direction (nick collision?)
510 /* csircd will send out unknown umode flag for +a (admin), drop it here. */
511 if(numeric
== ERR_UMODEUNKNOWNFLAG
&& MyClient(target_p
))
514 /* Fake it for server hiding, if its our client */
515 sendto_one(target_p
, ":%s %03d %s%s",
516 get_id(source_p
, target_p
), numeric
,
517 get_id(target_p
, target_p
), buffer
);
520 else if((chptr
= find_channel(parv
[1])) != NULL
)
521 sendto_channel_flags(client_p
, ALL_MEMBERS
, source_p
, chptr
,
523 numeric
, chptr
->chname
, buffer
);
526 static void do_alias(struct alias_entry
*aptr
, struct Client
*source_p
, char *text
)
529 struct Client
*target_p
;
531 if (!IsFloodDone(source_p
) && source_p
->localClient
->receiveM
> 20)
532 flood_endgrace(source_p
);
534 p
= strchr(aptr
->target
, '@');
538 target_p
= find_server(NULL
, p
+ 1);
539 if (target_p
!= NULL
&& IsMe(target_p
))
544 /* nick, must be +S */
545 target_p
= find_named_person(aptr
->target
);
546 if (target_p
!= NULL
&& !IsService(target_p
))
550 if (target_p
== NULL
)
552 sendto_one_numeric(source_p
, ERR_SERVICESDOWN
, form_str(ERR_SERVICESDOWN
), aptr
->target
);
556 if (text
!= NULL
&& *text
== ':')
558 if (text
== NULL
|| *text
== '\0')
560 sendto_one(source_p
, form_str(ERR_NOTEXTTOSEND
), me
.name
, source_p
->name
);
564 /* increment the hitcounter on this alias */
567 sendto_one(target_p
, ":%s PRIVMSG %s :%s",
568 get_id(source_p
, target_p
),
569 p
!= NULL
? aptr
->target
: get_id(target_p
, target_p
),
574 m_not_oper(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
576 sendto_one_numeric(source_p
, ERR_NOPRIVILEGES
, form_str(ERR_NOPRIVILEGES
));
581 m_unregistered(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
584 * I don't =really= want to waste a bit in a flag
585 * number_of_nick_changes is only really valid after the client
586 * is fully registered..
588 if(client_p
->localClient
->number_of_nick_changes
== 0)
590 sendto_one(client_p
, form_str(ERR_NOTREGISTERED
), me
.name
);
591 client_p
->localClient
->number_of_nick_changes
++;
598 m_registered(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
600 sendto_one(client_p
, form_str(ERR_ALREADYREGISTRED
), me
.name
, source_p
->name
);
605 m_ignore(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])