]>
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
45 rb_dictionary
*cmd_dict
= NULL
;
46 rb_dictionary
*alias_dict
= NULL
;
48 static void cancel_clients(struct Client
*, struct Client
*);
49 static void remove_unknown(struct Client
*, const char *, char *);
51 static void do_numeric(int, struct Client
*, struct Client
*, int, const char **);
52 static void do_alias(struct alias_entry
*, struct Client
*, char *);
54 static int handle_command(struct Message
*, struct MsgBuf
*, struct Client
*, struct Client
*);
56 static char buffer
[1024];
58 /* turn a string into a parc/parv pair */
60 char *reconstruct_parv(int parc
, const char *parv
[])
62 static char tmpbuf
[BUFSIZE
]; int i
;
64 rb_strlcpy(tmpbuf
, parv
[0], BUFSIZE
);
65 for (i
= 1; i
< parc
; i
++)
67 rb_strlcat(tmpbuf
, " ", BUFSIZE
);
68 rb_strlcat(tmpbuf
, parv
[i
], BUFSIZE
);
75 * given a raw buffer, parses it and generates parv and parc
78 parse(struct Client
*client_p
, char *pbuffer
, char *bufend
)
80 struct Client
*from
= client_p
;
87 s_assert(MyConnect(client_p
));
88 s_assert(client_p
->localClient
->F
!= NULL
);
89 if(IsAnyDead(client_p
))
94 /* XXX this should be done before parse() is called */
100 res
= msgbuf_parse(&msgbuf
, pbuffer
);
103 ServerStats
.is_empt
++;
107 if (msgbuf
.origin
!= NULL
&& IsServer(client_p
))
109 from
= find_client(msgbuf
.origin
);
111 /* didnt find any matching client, issue a kill */
114 ServerStats
.is_unpf
++;
115 remove_unknown(client_p
, msgbuf
.origin
, pbuffer
);
119 /* fake direction, hmm. */
120 if(from
->from
!= client_p
)
122 ServerStats
.is_wrdi
++;
123 cancel_clients(client_p
, from
);
128 if(IsDigit(*msgbuf
.cmd
) && IsDigit(*(msgbuf
.cmd
+ 1)) && IsDigit(*(msgbuf
.cmd
+ 2)))
131 numeric
= atoi(msgbuf
.cmd
);
132 ServerStats
.is_num
++;
136 mptr
= rb_dictionary_retrieve(cmd_dict
, msgbuf
.cmd
);
138 /* no command or its encap only, error */
139 if(!mptr
|| !mptr
->cmd
)
141 if (IsPerson(client_p
))
143 struct alias_entry
*aptr
= rb_dictionary_retrieve(alias_dict
, msgbuf
.cmd
);
146 if (msgbuf
.n_para
< 2)
148 sendto_one(client_p
, form_str(ERR_NEEDMOREPARAMS
),
150 EmptyString(client_p
->name
) ? "*" : client_p
->name
,
155 do_alias(aptr
, client_p
, reconstruct_parv(msgbuf
.n_para
- 1, msgbuf
.para
+ 1));
161 sendto_one(from
, form_str(ERR_UNKNOWNCOMMAND
),
162 me
.name
, from
->name
, msgbuf
.cmd
);
164 ServerStats
.is_unco
++;
168 mptr
->bytes
+= msgbuf
.parselen
;
173 do_numeric(numeric
, client_p
, from
, msgbuf
.n_para
, msgbuf
.para
);
177 if(handle_command(mptr
, &msgbuf
, client_p
, from
) < -1)
180 for (p
= pbuffer
; p
<= end
; p
+= 8)
183 /* Its expected this nasty code can be removed
184 * or rewritten later if still needed.
188 for (; p
<= end
; p
++)
190 ilog(L_MAIN
, "%02x |%c", p
[0], p
[0]);
195 "%02x %02x %02x %02x %02x %02x %02x %02x |%c%c%c%c%c%c%c%c",
196 p
[0], p
[1], p
[2], p
[3], p
[4], p
[5],
197 p
[6], p
[7], p
[0], p
[1], p
[2], p
[3], p
[4], p
[5], p
[6], p
[7]);
206 * inputs - pointer to message block
207 * - pointer to message buffer
208 * - pointer to client
209 * - pointer to client message is from
210 * output - -1 if error from server
214 handle_command(struct Message
*mptr
, struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*from
)
216 struct MessageEntry ehandler
;
217 MessageHandler handler
= 0;
218 char squitreason
[80];
220 if(IsAnyDead(client_p
))
223 if(IsServer(client_p
))
228 ehandler
= mptr
->handlers
[from
->handler
];
229 handler
= ehandler
.handler
;
231 /* check right amount of params is passed... --is */
232 if(msgbuf_p
->n_para
< ehandler
.min_para
||
233 (ehandler
.min_para
&& EmptyString(msgbuf_p
->para
[ehandler
.min_para
- 1])))
235 if(!IsServer(client_p
))
237 sendto_one(client_p
, form_str(ERR_NEEDMOREPARAMS
),
239 EmptyString(client_p
->name
) ? "*" : client_p
->name
,
241 if(MyClient(client_p
))
247 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
248 "Dropping server %s due to (invalid) command '%s'"
249 " with only %zu arguments (expecting %zu).",
250 client_p
->name
, mptr
->cmd
, msgbuf_p
->n_para
, ehandler
.min_para
);
252 "Insufficient parameters (%zu < %zu) for command '%s' from %s.",
253 msgbuf_p
->n_para
, ehandler
.min_para
, mptr
->cmd
, client_p
->name
);
254 snprintf(squitreason
, sizeof squitreason
,
255 "Insufficient parameters (%zu < %zu) for command '%s'",
256 msgbuf_p
->n_para
, ehandler
.min_para
, mptr
->cmd
);
257 exit_client(client_p
, client_p
, client_p
, squitreason
);
261 (*handler
) (msgbuf_p
, client_p
, from
, msgbuf_p
->n_para
, msgbuf_p
->para
);
266 handle_encap(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
,
267 const char *command
, int parc
, const char *parv
[])
269 struct Message
*mptr
;
270 struct MessageEntry ehandler
;
271 MessageHandler handler
= 0;
273 mptr
= rb_dictionary_retrieve(cmd_dict
, command
);
275 if(mptr
== NULL
|| mptr
->cmd
== NULL
)
278 ehandler
= mptr
->handlers
[ENCAP_HANDLER
];
279 handler
= ehandler
.handler
;
281 if((size_t)parc
< ehandler
.min_para
||
282 (ehandler
.min_para
&& EmptyString(parv
[ehandler
.min_para
- 1])))
285 (*handler
) (msgbuf_p
, client_p
, source_p
, parc
, parv
);
293 * side effects - MUST MUST be called at startup ONCE before
294 * any other keyword hash routine is used.
299 cmd_dict
= rb_dictionary_create("command", strcasecmp
);
304 * inputs - command name
305 * - pointer to struct Message
307 * side effects - load this one command name
308 * msg->count msg->bytes is modified in place, in
309 * modules address space. Might not want to do that...
312 mod_add_cmd(struct Message
*msg
)
314 s_assert(msg
!= NULL
);
318 if (rb_dictionary_find(cmd_dict
, msg
->cmd
) != NULL
)
325 rb_dictionary_add(cmd_dict
, msg
->cmd
, msg
);
330 * inputs - command name
332 * side effects - unload this one command name
335 mod_del_cmd(struct Message
*msg
)
337 s_assert(msg
!= NULL
);
341 rb_dictionary_delete(cmd_dict
, msg
->cmd
);
346 * inputs - client who sent us the message, client with fake
348 * outputs - a given warning about the fake direction
352 cancel_clients(struct Client
*client_p
, struct Client
*source_p
)
354 /* ok, fake prefix happens naturally during a burst on a nick
355 * collision with TS5, we cant kill them because one client has to
356 * survive, so we just send an error.
358 if(IsServer(source_p
) || IsMe(source_p
))
360 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
361 "Message for %s[%s] from %s",
362 source_p
->name
, source_p
->from
->name
,
367 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
368 "Message for %s[%s@%s!%s] from %s (TS, ignored)",
372 source_p
->from
->name
,
379 * inputs - client who gave us message, supposed sender, buffer
381 * side effects - kills issued for clients, squits for servers
384 remove_unknown(struct Client
*client_p
, const char *lsender
, char *lbuffer
)
386 int slen
= strlen(lsender
);
388 struct Client
*server
;
390 /* meepfoo is a nickname (ignore)
391 * #XXXXXXXX is a UID (KILL)
392 * #XX is a SID (SQUIT)
393 * meep.foo is a server (SQUIT)
395 if((IsDigit(lsender
[0]) && slen
== 3) ||
396 (strchr(lsender
, '.') != NULL
))
398 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
399 "Unknown prefix (%s) from %s, Squitting %s",
400 lbuffer
, client_p
->name
, lsender
);
403 ":%s SQUIT %s :(Unknown prefix (%s) from %s)",
404 get_id(&me
, client_p
), lsender
,
405 lbuffer
, client_p
->name
);
407 else if(!IsDigit(lsender
[0]))
410 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
411 "Invalid prefix (%s) from %s",
412 lbuffer
, client_p
->name
);
415 memcpy(sid
, lsender
, 3);
417 server
= find_server(NULL
, sid
);
418 if (server
!= NULL
&& server
->from
== client_p
)
419 sendto_one(client_p
, ":%s KILL %s :%s (Unknown Client)",
420 get_id(&me
, client_p
), lsender
, me
.name
);
428 * parc number of arguments ('sender' counted as one!)
429 * parv[1]..parv[parc-1]
430 * pointers to additional parameters, this is a NULL
431 * terminated list (parv[parc] == NULL).
434 * Numerics are mostly error reports. If there is something
435 * wrong with the message, just *DROP* it! Don't even think of
436 * sending back a neat error message -- big danger of creating
437 * a ping pong error message...
440 do_numeric(int numeric
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
442 struct Client
*target_p
;
443 struct Channel
*chptr
;
445 if(parc
< 2 || !IsServer(source_p
))
448 /* Remap low number numerics. */
453 * Prepare the parameter portion of the message into 'buffer'.
454 * (Because the buffer is twice as large as the message buffer
455 * for the socket, no overflow can occur here... ...on current
456 * assumptions--bets are off, if these are changed --msa)
457 * Note: if buffer is non-empty, it will begin with SPACE.
461 char *t
= buffer
; /* Current position within the buffer */
463 int tl
; /* current length of presently being built string in t */
464 for (i
= 2; i
< (parc
- 1); i
++)
466 tl
= sprintf(t
, " %s", parv
[i
]);
469 sprintf(t
, " :%s", parv
[parc
- 1]);
472 if((target_p
= find_client(parv
[1])) != NULL
)
477 * We shouldn't get numerics sent to us,
478 * any numerics we do get indicate a bug somewhere..
480 /* ugh. this is here because of nick collisions. when two servers
481 * relink, they burst each other their nicks, then perform collides.
482 * if there is a nick collision, BOTH servers will kill their own
483 * nicks, and BOTH will kill the other servers nick, which wont exist,
484 * because it will have been already killed by the local server.
486 * unfortunately, as we cant guarantee other servers will do the
487 * "right thing" on a nick collision, we have to keep both kills.
488 * ergo we need to ignore ERR_NOSUCHNICK. --fl_
490 /* quick comment. This _was_ tried. i.e. assume the other servers
491 * will do the "right thing" and kill a nick that is colliding.
492 * unfortunately, it did not work. --Dianora
494 /* note, now we send PING on server connect, we can
495 * also get ERR_NOSUCHSERVER..
497 if(numeric
!= ERR_NOSUCHNICK
&&
498 numeric
!= ERR_NOSUCHSERVER
)
499 sendto_realops_snomask(SNO_GENERAL
, L_ADMIN
,
500 "*** %s(via %s) sent a %03d numeric to me: %s",
502 client_p
->name
, numeric
, buffer
);
505 else if(target_p
->from
== client_p
)
507 /* This message changed direction (nick collision?)
513 /* csircd will send out unknown umode flag for +a (admin), drop it here. */
514 if(numeric
== ERR_UMODEUNKNOWNFLAG
&& MyClient(target_p
))
517 /* Fake it for server hiding, if its our client */
518 sendto_one(target_p
, ":%s %03d %s%s",
519 get_id(source_p
, target_p
), numeric
,
520 get_id(target_p
, target_p
), buffer
);
523 else if((chptr
= find_channel(parv
[1])) != NULL
)
524 sendto_channel_flags(client_p
, ALL_MEMBERS
, source_p
, chptr
,
526 numeric
, chptr
->chname
, buffer
);
529 static void do_alias(struct alias_entry
*aptr
, struct Client
*source_p
, char *text
)
532 struct Client
*target_p
;
534 if (!IsFloodDone(source_p
) && source_p
->localClient
->receiveM
> 20)
535 flood_endgrace(source_p
);
537 p
= strchr(aptr
->target
, '@');
541 target_p
= find_server(NULL
, p
+ 1);
542 if (target_p
!= NULL
&& IsMe(target_p
))
547 /* nick, must be +S */
548 target_p
= find_named_person(aptr
->target
);
549 if (target_p
!= NULL
&& !IsService(target_p
))
553 if (target_p
== NULL
)
555 sendto_one_numeric(source_p
, ERR_SERVICESDOWN
, form_str(ERR_SERVICESDOWN
), aptr
->target
);
559 if (text
!= NULL
&& *text
== ':')
561 if (text
== NULL
|| *text
== '\0')
563 sendto_one(source_p
, form_str(ERR_NOTEXTTOSEND
), me
.name
, source_p
->name
);
567 /* increment the hitcounter on this alias */
570 sendto_one(target_p
, ":%s PRIVMSG %s :%s",
571 get_id(source_p
, target_p
),
572 p
!= NULL
? aptr
->target
: get_id(target_p
, target_p
),
577 m_not_oper(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
579 sendto_one_numeric(source_p
, ERR_NOPRIVILEGES
, form_str(ERR_NOPRIVILEGES
));
583 m_unregistered(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
586 * I don't =really= want to waste a bit in a flag
587 * number_of_nick_changes is only really valid after the client
588 * is fully registered..
590 if(client_p
->localClient
->number_of_nick_changes
== 0)
592 sendto_one(client_p
, form_str(ERR_NOTREGISTERED
), me
.name
);
593 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
);
604 m_ignore(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])