]>
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 struct Dictionary
*cmd_dict
= NULL
;
46 struct Dictionary
*alias_dict
= NULL
;
48 /* parv[0] is not used, and parv[LAST] == NULL */
49 static char *para
[MAXPARA
+ 2];
51 static void cancel_clients(struct Client
*, struct Client
*);
52 static void remove_unknown(struct Client
*, const char *, char *);
54 static void do_numeric(int, struct Client
*, struct Client
*, int, const char **);
55 static void do_alias(struct alias_entry
*, struct Client
*, char *);
57 static int handle_command(struct Message
*, struct MsgBuf
*, struct Client
*, struct Client
*);
59 static char buffer
[1024];
61 /* turn a string into a parc/parv pair */
63 char *reconstruct_parv(int parc
, const char *parv
[])
65 static char tmpbuf
[BUFSIZE
]; int i
;
67 rb_strlcpy(tmpbuf
, parv
[0], BUFSIZE
);
68 for (i
= 1; i
< parc
; i
++)
70 rb_strlcat(tmpbuf
, " ", BUFSIZE
);
71 rb_strlcat(tmpbuf
, parv
[i
], BUFSIZE
);
78 * given a raw buffer, parses it and generates parv and parc
81 parse(struct Client
*client_p
, char *pbuffer
, char *bufend
)
83 struct Client
*from
= client_p
;
90 s_assert(MyConnect(client_p
));
91 s_assert(client_p
->localClient
->F
!= NULL
);
92 if(IsAnyDead(client_p
))
97 /* XXX this should be done before parse() is called */
103 res
= msgbuf_parse(&msgbuf
, pbuffer
);
106 ServerStats
.is_empt
++;
110 if (msgbuf
.origin
!= NULL
&& IsServer(client_p
))
112 from
= find_client(msgbuf
.origin
);
114 /* didnt find any matching client, issue a kill */
117 ServerStats
.is_unpf
++;
118 remove_unknown(client_p
, msgbuf
.origin
, pbuffer
);
122 /* fake direction, hmm. */
123 if(from
->from
!= client_p
)
125 ServerStats
.is_wrdi
++;
126 cancel_clients(client_p
, from
);
131 if(IsDigit(*msgbuf
.cmd
) && IsDigit(*(msgbuf
.cmd
+ 1)) && IsDigit(*(msgbuf
.cmd
+ 2)))
134 numeric
= atoi(msgbuf
.cmd
);
135 ServerStats
.is_num
++;
139 mptr
= rb_dictionary_retrieve(cmd_dict
, msgbuf
.cmd
);
141 /* no command or its encap only, error */
142 if(!mptr
|| !mptr
->cmd
)
144 if (IsPerson(client_p
))
146 struct alias_entry
*aptr
= rb_dictionary_retrieve(alias_dict
, msgbuf
.cmd
);
149 if (msgbuf
.n_para
< 2)
151 sendto_one(client_p
, form_str(ERR_NEEDMOREPARAMS
),
153 EmptyString(client_p
->name
) ? "*" : client_p
->name
,
158 do_alias(aptr
, client_p
, reconstruct_parv(msgbuf
.n_para
- 1, msgbuf
.para
+ 1));
164 sendto_one(from
, form_str(ERR_UNKNOWNCOMMAND
),
165 me
.name
, from
->name
, msgbuf
.cmd
);
167 ServerStats
.is_unco
++;
171 mptr
->bytes
+= msgbuf
.parselen
;
176 do_numeric(numeric
, client_p
, from
, msgbuf
.n_para
, msgbuf
.para
);
180 if(handle_command(mptr
, &msgbuf
, client_p
, from
) < -1)
183 for (p
= pbuffer
; p
<= end
; p
+= 8)
186 /* Its expected this nasty code can be removed
187 * or rewritten later if still needed.
191 for (; p
<= end
; p
++)
193 ilog(L_MAIN
, "%02x |%c", p
[0], p
[0]);
198 "%02x %02x %02x %02x %02x %02x %02x %02x |%c%c%c%c%c%c%c%c",
199 p
[0], p
[1], p
[2], p
[3], p
[4], p
[5],
200 p
[6], p
[7], p
[0], p
[1], p
[2], p
[3], p
[4], p
[5], p
[6], p
[7]);
209 * inputs - pointer to message block
210 * - pointer to message buffer
211 * - pointer to client
212 * - pointer to client message is from
213 * output - -1 if error from server
217 handle_command(struct Message
*mptr
, struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*from
)
219 struct MessageEntry ehandler
;
220 MessageHandler handler
= 0;
221 char squitreason
[80];
223 if(IsAnyDead(client_p
))
226 if(IsServer(client_p
))
231 ehandler
= mptr
->handlers
[from
->handler
];
232 handler
= ehandler
.handler
;
234 /* check right amount of params is passed... --is */
235 if(msgbuf_p
->n_para
< ehandler
.min_para
||
236 (ehandler
.min_para
&& EmptyString(msgbuf_p
->para
[ehandler
.min_para
- 1])))
238 if(!IsServer(client_p
))
240 sendto_one(client_p
, form_str(ERR_NEEDMOREPARAMS
),
242 EmptyString(client_p
->name
) ? "*" : client_p
->name
,
244 if(MyClient(client_p
))
250 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
251 "Dropping server %s due to (invalid) command '%s'"
252 " with only %zu arguments (expecting %d).",
253 client_p
->name
, mptr
->cmd
, msgbuf_p
->n_para
, ehandler
.min_para
);
255 "Insufficient parameters (%zu < %d) for command '%s' from %s.",
256 msgbuf_p
->n_para
, ehandler
.min_para
, mptr
->cmd
, client_p
->name
);
257 snprintf(squitreason
, sizeof squitreason
,
258 "Insufficient parameters (%zu < %d) for command '%s'",
259 msgbuf_p
->n_para
, ehandler
.min_para
, mptr
->cmd
);
260 exit_client(client_p
, client_p
, client_p
, squitreason
);
264 (*handler
) (msgbuf_p
, client_p
, from
, msgbuf_p
->n_para
, msgbuf_p
->para
);
269 handle_encap(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
,
270 const char *command
, int parc
, const char *parv
[])
272 struct Message
*mptr
;
273 struct MessageEntry ehandler
;
274 MessageHandler handler
= 0;
276 mptr
= rb_dictionary_retrieve(cmd_dict
, command
);
278 if(mptr
== NULL
|| mptr
->cmd
== NULL
)
281 ehandler
= mptr
->handlers
[ENCAP_HANDLER
];
282 handler
= ehandler
.handler
;
284 if(parc
< ehandler
.min_para
||
285 (ehandler
.min_para
&& EmptyString(parv
[ehandler
.min_para
- 1])))
288 (*handler
) (msgbuf_p
, client_p
, source_p
, parc
, parv
);
296 * side effects - MUST MUST be called at startup ONCE before
297 * any other keyword hash routine is used.
302 cmd_dict
= rb_dictionary_create("command", strcasecmp
);
307 * inputs - command name
308 * - pointer to struct Message
310 * side effects - load this one command name
311 * msg->count msg->bytes is modified in place, in
312 * modules address space. Might not want to do that...
315 mod_add_cmd(struct Message
*msg
)
317 s_assert(msg
!= NULL
);
321 if (rb_dictionary_find(cmd_dict
, msg
->cmd
) != NULL
)
328 rb_dictionary_add(cmd_dict
, msg
->cmd
, msg
);
333 * inputs - command name
335 * side effects - unload this one command name
338 mod_del_cmd(struct Message
*msg
)
340 s_assert(msg
!= NULL
);
344 rb_dictionary_delete(cmd_dict
, msg
->cmd
);
349 * inputs - client who sent us the message, client with fake
351 * outputs - a given warning about the fake direction
355 cancel_clients(struct Client
*client_p
, struct Client
*source_p
)
357 /* ok, fake prefix happens naturally during a burst on a nick
358 * collision with TS5, we cant kill them because one client has to
359 * survive, so we just send an error.
361 if(IsServer(source_p
) || IsMe(source_p
))
363 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
364 "Message for %s[%s] from %s",
365 source_p
->name
, source_p
->from
->name
,
370 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
371 "Message for %s[%s@%s!%s] from %s (TS, ignored)",
375 source_p
->from
->name
,
382 * inputs - client who gave us message, supposed sender, buffer
384 * side effects - kills issued for clients, squits for servers
387 remove_unknown(struct Client
*client_p
, const char *lsender
, char *lbuffer
)
389 int slen
= strlen(lsender
);
391 struct Client
*server
;
393 /* meepfoo is a nickname (ignore)
394 * #XXXXXXXX is a UID (KILL)
395 * #XX is a SID (SQUIT)
396 * meep.foo is a server (SQUIT)
398 if((IsDigit(lsender
[0]) && slen
== 3) ||
399 (strchr(lsender
, '.') != NULL
))
401 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
402 "Unknown prefix (%s) from %s, Squitting %s",
403 lbuffer
, client_p
->name
, lsender
);
406 ":%s SQUIT %s :(Unknown prefix (%s) from %s)",
407 get_id(&me
, client_p
), lsender
,
408 lbuffer
, client_p
->name
);
410 else if(!IsDigit(lsender
[0]))
413 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
414 "Invalid prefix (%s) from %s",
415 lbuffer
, client_p
->name
);
418 memcpy(sid
, lsender
, 3);
420 server
= find_server(NULL
, sid
);
421 if (server
!= NULL
&& server
->from
== client_p
)
422 sendto_one(client_p
, ":%s KILL %s :%s (Unknown Client)",
423 get_id(&me
, client_p
), lsender
, me
.name
);
431 * parc number of arguments ('sender' counted as one!)
432 * parv[1]..parv[parc-1]
433 * pointers to additional parameters, this is a NULL
434 * terminated list (parv[parc] == NULL).
437 * Numerics are mostly error reports. If there is something
438 * wrong with the message, just *DROP* it! Don't even think of
439 * sending back a neat error message -- big danger of creating
440 * a ping pong error message...
443 do_numeric(int numeric
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
445 struct Client
*target_p
;
446 struct Channel
*chptr
;
448 if(parc
< 2 || !IsServer(source_p
))
451 /* Remap low number numerics. */
456 * Prepare the parameter portion of the message into 'buffer'.
457 * (Because the buffer is twice as large as the message buffer
458 * for the socket, no overflow can occur here... ...on current
459 * assumptions--bets are off, if these are changed --msa)
460 * Note: if buffer is non-empty, it will begin with SPACE.
464 char *t
= buffer
; /* Current position within the buffer */
466 int tl
; /* current length of presently being built string in t */
467 for (i
= 2; i
< (parc
- 1); i
++)
469 tl
= sprintf(t
, " %s", parv
[i
]);
472 sprintf(t
, " :%s", parv
[parc
- 1]);
475 if((target_p
= find_client(parv
[1])) != NULL
)
480 * We shouldn't get numerics sent to us,
481 * any numerics we do get indicate a bug somewhere..
483 /* ugh. this is here because of nick collisions. when two servers
484 * relink, they burst each other their nicks, then perform collides.
485 * if there is a nick collision, BOTH servers will kill their own
486 * nicks, and BOTH will kill the other servers nick, which wont exist,
487 * because it will have been already killed by the local server.
489 * unfortunately, as we cant guarantee other servers will do the
490 * "right thing" on a nick collision, we have to keep both kills.
491 * ergo we need to ignore ERR_NOSUCHNICK. --fl_
493 /* quick comment. This _was_ tried. i.e. assume the other servers
494 * will do the "right thing" and kill a nick that is colliding.
495 * unfortunately, it did not work. --Dianora
497 /* note, now we send PING on server connect, we can
498 * also get ERR_NOSUCHSERVER..
500 if(numeric
!= ERR_NOSUCHNICK
&&
501 numeric
!= ERR_NOSUCHSERVER
)
502 sendto_realops_snomask(SNO_GENERAL
, L_ADMIN
,
503 "*** %s(via %s) sent a %03d numeric to me: %s",
505 client_p
->name
, numeric
, buffer
);
508 else if(target_p
->from
== client_p
)
510 /* This message changed direction (nick collision?)
516 /* csircd will send out unknown umode flag for +a (admin), drop it here. */
517 if(numeric
== ERR_UMODEUNKNOWNFLAG
&& MyClient(target_p
))
520 /* Fake it for server hiding, if its our client */
521 sendto_one(target_p
, ":%s %03d %s%s",
522 get_id(source_p
, target_p
), numeric
,
523 get_id(target_p
, target_p
), buffer
);
526 else if((chptr
= find_channel(parv
[1])) != NULL
)
527 sendto_channel_flags(client_p
, ALL_MEMBERS
, source_p
, chptr
,
529 numeric
, chptr
->chname
, buffer
);
532 static void do_alias(struct alias_entry
*aptr
, struct Client
*source_p
, char *text
)
535 struct Client
*target_p
;
537 if (!IsFloodDone(source_p
) && source_p
->localClient
->receiveM
> 20)
538 flood_endgrace(source_p
);
540 p
= strchr(aptr
->target
, '@');
544 target_p
= find_server(NULL
, p
+ 1);
545 if (target_p
!= NULL
&& IsMe(target_p
))
550 /* nick, must be +S */
551 target_p
= find_named_person(aptr
->target
);
552 if (target_p
!= NULL
&& !IsService(target_p
))
556 if (target_p
== NULL
)
558 sendto_one_numeric(source_p
, ERR_SERVICESDOWN
, form_str(ERR_SERVICESDOWN
), aptr
->target
);
562 if (text
!= NULL
&& *text
== ':')
564 if (text
== NULL
|| *text
== '\0')
566 sendto_one(source_p
, form_str(ERR_NOTEXTTOSEND
), me
.name
, source_p
->name
);
570 /* increment the hitcounter on this alias */
573 sendto_one(target_p
, ":%s PRIVMSG %s :%s",
574 get_id(source_p
, target_p
),
575 p
!= NULL
? aptr
->target
: get_id(target_p
, target_p
),
580 m_not_oper(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
582 sendto_one_numeric(source_p
, ERR_NOPRIVILEGES
, form_str(ERR_NOPRIVILEGES
));
586 m_unregistered(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
589 * I don't =really= want to waste a bit in a flag
590 * number_of_nick_changes is only really valid after the client
591 * is fully registered..
593 if(client_p
->localClient
->number_of_nick_changes
== 0)
595 sendto_one(client_p
, form_str(ERR_NOTREGISTERED
), me
.name
);
596 client_p
->localClient
->number_of_nick_changes
++;
601 m_registered(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
603 sendto_one(client_p
, form_str(ERR_ALREADYREGISTRED
), me
.name
, source_p
->name
);
607 m_ignore(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])