]>
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
44 rb_dictionary
*cmd_dict
= NULL
;
45 rb_dictionary
*alias_dict
= NULL
;
47 static void cancel_clients(struct Client
*, struct Client
*);
48 static void remove_unknown(struct Client
*, const char *, char *);
50 static void do_numeric(int, struct Client
*, struct Client
*, int, const char **);
52 static int handle_command(struct Message
*, struct MsgBuf
*, struct Client
*, struct Client
*);
54 static char buffer
[1024];
56 /* turn a string into a parc/parv pair */
58 char *reconstruct_parv(int parc
, const char *parv
[])
60 static char tmpbuf
[BUFSIZE
]; int i
;
62 rb_strlcpy(tmpbuf
, parv
[0], BUFSIZE
);
63 for (i
= 1; i
< parc
; i
++)
65 rb_strlcat(tmpbuf
, " ", BUFSIZE
);
66 rb_strlcat(tmpbuf
, parv
[i
], BUFSIZE
);
73 * given a raw buffer, parses it and generates parv and parc
76 parse(struct Client
*client_p
, char *pbuffer
, char *bufend
)
78 struct Client
*from
= client_p
;
85 s_assert(MyConnect(client_p
));
86 s_assert(client_p
->localClient
->F
!= NULL
);
87 if(IsAnyDead(client_p
))
92 /* XXX this should be done before parse() is called */
98 res
= msgbuf_parse(&msgbuf
, pbuffer
);
101 ServerStats
.is_empt
++;
105 if (msgbuf
.origin
!= NULL
&& IsServer(client_p
))
107 from
= find_client(msgbuf
.origin
);
109 /* didnt find any matching client, issue a kill */
112 ServerStats
.is_unpf
++;
113 remove_unknown(client_p
, msgbuf
.origin
, pbuffer
);
117 /* fake direction, hmm. */
118 if(from
->from
!= client_p
)
120 ServerStats
.is_wrdi
++;
121 cancel_clients(client_p
, from
);
126 if(IsDigit(*msgbuf
.cmd
) && IsDigit(*(msgbuf
.cmd
+ 1)) && IsDigit(*(msgbuf
.cmd
+ 2)))
129 numeric
= atoi(msgbuf
.cmd
);
130 ServerStats
.is_num
++;
134 mptr
= rb_dictionary_retrieve(cmd_dict
, msgbuf
.cmd
);
136 /* no command or its encap only, error */
137 if(!mptr
|| !mptr
->cmd
)
141 sendto_one(from
, form_str(ERR_UNKNOWNCOMMAND
),
142 me
.name
, from
->name
, msgbuf
.cmd
);
144 ServerStats
.is_unco
++;
151 do_numeric(numeric
, client_p
, from
, msgbuf
.n_para
, msgbuf
.para
);
155 if(handle_command(mptr
, &msgbuf
, client_p
, from
) < -1)
158 for (p
= pbuffer
; p
<= end
; p
+= 8)
161 /* Its expected this nasty code can be removed
162 * or rewritten later if still needed.
166 for (; p
<= end
; p
++)
168 ilog(L_MAIN
, "%02x |%c", p
[0], p
[0]);
173 "%02x %02x %02x %02x %02x %02x %02x %02x |%c%c%c%c%c%c%c%c",
174 p
[0], p
[1], p
[2], p
[3], p
[4], p
[5],
175 p
[6], p
[7], p
[0], p
[1], p
[2], p
[3], p
[4], p
[5], p
[6], p
[7]);
184 * inputs - pointer to message block
185 * - pointer to message buffer
186 * - pointer to client
187 * - pointer to client message is from
188 * output - -1 if error from server
192 handle_command(struct Message
*mptr
, struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*from
)
194 struct MessageEntry ehandler
;
195 MessageHandler handler
= 0;
196 char squitreason
[80];
198 if(IsAnyDead(client_p
))
201 if(IsServer(client_p
))
206 ehandler
= mptr
->handlers
[from
->handler
];
207 handler
= ehandler
.handler
;
209 /* check right amount of params is passed... --is */
210 if(msgbuf_p
->n_para
< ehandler
.min_para
||
211 (ehandler
.min_para
&& EmptyString(msgbuf_p
->para
[ehandler
.min_para
- 1])))
213 if(!IsServer(client_p
))
215 sendto_one(client_p
, form_str(ERR_NEEDMOREPARAMS
),
217 EmptyString(client_p
->name
) ? "*" : client_p
->name
,
219 if(MyClient(client_p
))
225 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
226 "Dropping server %s due to (invalid) command '%s'"
227 " with only %zu arguments (expecting %zu).",
228 client_p
->name
, mptr
->cmd
, msgbuf_p
->n_para
, ehandler
.min_para
);
230 "Insufficient parameters (%zu < %zu) for command '%s' from %s.",
231 msgbuf_p
->n_para
, ehandler
.min_para
, mptr
->cmd
, client_p
->name
);
232 snprintf(squitreason
, sizeof squitreason
,
233 "Insufficient parameters (%zu < %zu) for command '%s'",
234 msgbuf_p
->n_para
, ehandler
.min_para
, mptr
->cmd
);
235 exit_client(client_p
, client_p
, client_p
, squitreason
);
239 (*handler
) (msgbuf_p
, client_p
, from
, msgbuf_p
->n_para
, msgbuf_p
->para
);
244 handle_encap(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
,
245 const char *command
, int parc
, const char *parv
[])
247 struct Message
*mptr
;
248 struct MessageEntry ehandler
;
249 MessageHandler handler
= 0;
251 mptr
= rb_dictionary_retrieve(cmd_dict
, command
);
253 if(mptr
== NULL
|| mptr
->cmd
== NULL
)
256 ehandler
= mptr
->handlers
[ENCAP_HANDLER
];
257 handler
= ehandler
.handler
;
259 if((size_t)parc
< ehandler
.min_para
||
260 (ehandler
.min_para
&& EmptyString(parv
[ehandler
.min_para
- 1])))
263 (*handler
) (msgbuf_p
, client_p
, source_p
, parc
, parv
);
271 * side effects - MUST MUST be called at startup ONCE before
272 * any other keyword hash routine is used.
277 cmd_dict
= rb_dictionary_create("command", rb_strcasecmp
);
282 * inputs - command name
283 * - pointer to struct Message
285 * side effects - load this one command name
286 * msg->count msg->bytes is modified in place, in
287 * modules address space. Might not want to do that...
290 mod_add_cmd(struct Message
*msg
)
292 s_assert(msg
!= NULL
);
296 if (rb_dictionary_find(cmd_dict
, msg
->cmd
) != NULL
) {
297 ilog(L_MAIN
, "Add command: %s already exists", msg
->cmd
);
306 rb_dictionary_add(cmd_dict
, msg
->cmd
, msg
);
311 * inputs - command name
313 * side effects - unload this one command name
316 mod_del_cmd(struct Message
*msg
)
318 s_assert(msg
!= NULL
);
322 if (rb_dictionary_delete(cmd_dict
, msg
->cmd
) == NULL
) {
323 ilog(L_MAIN
, "Delete command: %s not found", msg
->cmd
);
330 * inputs - client who sent us the message, client with fake
332 * outputs - a given warning about the fake direction
336 cancel_clients(struct Client
*client_p
, struct Client
*source_p
)
338 /* ok, fake prefix happens naturally during a burst on a nick
339 * collision with TS5, we cant kill them because one client has to
340 * survive, so we just send an error.
342 if(IsServer(source_p
) || IsMe(source_p
))
344 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
345 "Message for %s[%s] from %s",
346 source_p
->name
, source_p
->from
->name
,
351 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
352 "Message for %s[%s@%s!%s] from %s (TS, ignored)",
356 source_p
->from
->name
,
363 * inputs - client who gave us message, supposed sender, buffer
365 * side effects - kills issued for clients, squits for servers
368 remove_unknown(struct Client
*client_p
, const char *lsender
, char *lbuffer
)
370 int slen
= strlen(lsender
);
372 struct Client
*server
;
374 /* meepfoo is a nickname (ignore)
375 * #XXXXXXXX is a UID (KILL)
376 * #XX is a SID (SQUIT)
377 * meep.foo is a server (SQUIT)
379 if((IsDigit(lsender
[0]) && slen
== 3) ||
380 (strchr(lsender
, '.') != NULL
))
382 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
383 "Unknown prefix (%s) from %s, Squitting %s",
384 lbuffer
, client_p
->name
, lsender
);
387 ":%s SQUIT %s :(Unknown prefix (%s) from %s)",
388 get_id(&me
, client_p
), lsender
,
389 lbuffer
, client_p
->name
);
391 else if(!IsDigit(lsender
[0]))
394 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
395 "Invalid prefix (%s) from %s",
396 lbuffer
, client_p
->name
);
399 memcpy(sid
, lsender
, 3);
401 server
= find_server(NULL
, sid
);
402 if (server
!= NULL
&& server
->from
== client_p
)
403 sendto_one(client_p
, ":%s KILL %s :%s (Unknown Client)",
404 get_id(&me
, client_p
), lsender
, me
.name
);
412 * parc number of arguments ('sender' counted as one!)
413 * parv[1]..parv[parc-1]
414 * pointers to additional parameters, this is a NULL
415 * terminated list (parv[parc] == NULL).
418 * Numerics are mostly error reports. If there is something
419 * wrong with the message, just *DROP* it! Don't even think of
420 * sending back a neat error message -- big danger of creating
421 * a ping pong error message...
424 do_numeric(int numeric
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
426 struct Client
*target_p
;
427 struct Channel
*chptr
;
429 if(parc
< 2 || !IsServer(source_p
))
432 /* Remap low number numerics. */
437 * Prepare the parameter portion of the message into 'buffer'.
438 * (Because the buffer is twice as large as the message buffer
439 * for the socket, no overflow can occur here... ...on current
440 * assumptions--bets are off, if these are changed --msa)
441 * Note: if buffer is non-empty, it will begin with SPACE.
445 char *t
= buffer
; /* Current position within the buffer */
447 int tl
; /* current length of presently being built string in t */
448 for (i
= 2; i
< (parc
- 1); i
++)
450 tl
= sprintf(t
, " %s", parv
[i
]);
453 sprintf(t
, " :%s", parv
[parc
- 1]);
456 if((target_p
= find_client(parv
[1])) != NULL
)
461 * We shouldn't get numerics sent to us,
462 * any numerics we do get indicate a bug somewhere..
464 /* ugh. this is here because of nick collisions. when two servers
465 * relink, they burst each other their nicks, then perform collides.
466 * if there is a nick collision, BOTH servers will kill their own
467 * nicks, and BOTH will kill the other servers nick, which wont exist,
468 * because it will have been already killed by the local server.
470 * unfortunately, as we cant guarantee other servers will do the
471 * "right thing" on a nick collision, we have to keep both kills.
472 * ergo we need to ignore ERR_NOSUCHNICK. --fl_
474 /* quick comment. This _was_ tried. i.e. assume the other servers
475 * will do the "right thing" and kill a nick that is colliding.
476 * unfortunately, it did not work. --Dianora
478 /* note, now we send PING on server connect, we can
479 * also get ERR_NOSUCHSERVER..
481 if(numeric
!= ERR_NOSUCHNICK
&&
482 numeric
!= ERR_NOSUCHSERVER
)
483 sendto_realops_snomask(SNO_GENERAL
, L_ADMIN
,
484 "*** %s(via %s) sent a %03d numeric to me: %s",
486 client_p
->name
, numeric
, buffer
);
489 else if(target_p
->from
== client_p
)
491 /* This message changed direction (nick collision?)
497 /* csircd will send out unknown umode flag for +a (admin), drop it here. */
498 if(numeric
== ERR_UMODEUNKNOWNFLAG
&& MyClient(target_p
))
501 /* Fake it for server hiding, if its our client */
502 sendto_one(target_p
, ":%s %03d %s%s",
503 get_id(source_p
, target_p
), numeric
,
504 get_id(target_p
, target_p
), buffer
);
507 else if((chptr
= find_channel(parv
[1])) != NULL
)
508 sendto_channel_flags(client_p
, ALL_MEMBERS
, source_p
, chptr
,
510 numeric
, chptr
->chname
, buffer
);
514 m_not_oper(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
516 sendto_one_numeric(source_p
, ERR_NOPRIVILEGES
, form_str(ERR_NOPRIVILEGES
));
520 m_unregistered(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
522 if(IsAnyServer(client_p
))
526 * I don't =really= want to waste a bit in a flag
527 * number_of_nick_changes is only really valid after the client
528 * is fully registered..
530 if(client_p
->localClient
->number_of_nick_changes
== 0)
532 sendto_one(client_p
, form_str(ERR_NOTREGISTERED
), me
.name
);
533 client_p
->localClient
->number_of_nick_changes
++;
538 m_registered(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
540 sendto_one(client_p
, form_str(ERR_ALREADYREGISTRED
), me
.name
, source_p
->name
);
544 m_ignore(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])