]>
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
)
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 do_alias(aptr
, client_p
, reconstruct_parv(msgbuf
.n_para
- 1, msgbuf
.para
+ 1));
155 sendto_one(from
, form_str(ERR_UNKNOWNCOMMAND
),
156 me
.name
, from
->name
, msgbuf
.cmd
);
158 ServerStats
.is_unco
++;
162 mptr
->bytes
+= msgbuf
.parselen
;
167 do_numeric(numeric
, client_p
, from
, msgbuf
.n_para
, msgbuf
.para
);
171 if(handle_command(mptr
, &msgbuf
, client_p
, from
) < -1)
174 for (p
= pbuffer
; p
<= end
; p
+= 8)
177 /* Its expected this nasty code can be removed
178 * or rewritten later if still needed.
180 if((unsigned long) (p
+ 8) > (unsigned long) end
)
182 for (; p
<= end
; p
++)
184 ilog(L_MAIN
, "%02x |%c", p
[0], p
[0]);
189 "%02x %02x %02x %02x %02x %02x %02x %02x |%c%c%c%c%c%c%c%c",
190 p
[0], p
[1], p
[2], p
[3], p
[4], p
[5],
191 p
[6], p
[7], p
[0], p
[1], p
[2], p
[3], p
[4], p
[5], p
[6], p
[7]);
200 * inputs - pointer to message block
201 * - pointer to message buffer
202 * - pointer to client
203 * - pointer to client message is from
204 * output - -1 if error from server
208 handle_command(struct Message
*mptr
, struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*from
)
210 struct MessageEntry ehandler
;
211 MessageHandler handler
= 0;
212 char squitreason
[80];
214 if(IsAnyDead(client_p
))
217 if(IsServer(client_p
))
222 ehandler
= mptr
->handlers
[from
->handler
];
223 handler
= ehandler
.handler
;
225 /* check right amount of params is passed... --is */
226 if(msgbuf_p
->n_para
< ehandler
.min_para
||
227 (ehandler
.min_para
&& EmptyString(msgbuf_p
->para
[ehandler
.min_para
- 1])))
229 if(!IsServer(client_p
))
231 sendto_one(client_p
, form_str(ERR_NEEDMOREPARAMS
),
233 EmptyString(client_p
->name
) ? "*" : client_p
->name
,
235 if(MyClient(client_p
))
241 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
242 "Dropping server %s due to (invalid) command '%s'"
243 " with only %zu arguments (expecting %d).",
244 client_p
->name
, mptr
->cmd
, msgbuf_p
->n_para
, ehandler
.min_para
);
246 "Insufficient parameters (%zu < %d) for command '%s' from %s.",
247 msgbuf_p
->n_para
, ehandler
.min_para
, mptr
->cmd
, client_p
->name
);
248 snprintf(squitreason
, sizeof squitreason
,
249 "Insufficient parameters (%zu < %d) for command '%s'",
250 msgbuf_p
->n_para
, ehandler
.min_para
, mptr
->cmd
);
251 exit_client(client_p
, client_p
, client_p
, squitreason
);
255 (*handler
) (msgbuf_p
, client_p
, from
, msgbuf_p
->n_para
, msgbuf_p
->para
);
260 handle_encap(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
,
261 const char *command
, int parc
, const char *parv
[])
263 struct Message
*mptr
;
264 struct MessageEntry ehandler
;
265 MessageHandler handler
= 0;
267 mptr
= rb_dictionary_retrieve(cmd_dict
, command
);
269 if(mptr
== NULL
|| mptr
->cmd
== NULL
)
272 ehandler
= mptr
->handlers
[ENCAP_HANDLER
];
273 handler
= ehandler
.handler
;
275 if(parc
< ehandler
.min_para
||
276 (ehandler
.min_para
&& EmptyString(parv
[ehandler
.min_para
- 1])))
279 (*handler
) (msgbuf_p
, client_p
, source_p
, parc
, parv
);
287 * side effects - MUST MUST be called at startup ONCE before
288 * any other keyword hash routine is used.
293 cmd_dict
= rb_dictionary_create("command", strcasecmp
);
298 * inputs - command name
299 * - pointer to struct Message
301 * side effects - load this one command name
302 * msg->count msg->bytes is modified in place, in
303 * modules address space. Might not want to do that...
306 mod_add_cmd(struct Message
*msg
)
308 s_assert(msg
!= NULL
);
312 if (rb_dictionary_find(cmd_dict
, msg
->cmd
) != NULL
)
319 rb_dictionary_add(cmd_dict
, msg
->cmd
, msg
);
324 * inputs - command name
326 * side effects - unload this one command name
329 mod_del_cmd(struct Message
*msg
)
331 s_assert(msg
!= NULL
);
335 rb_dictionary_delete(cmd_dict
, msg
->cmd
);
340 * inputs - client who sent us the message, client with fake
342 * outputs - a given warning about the fake direction
346 cancel_clients(struct Client
*client_p
, struct Client
*source_p
)
348 /* ok, fake prefix happens naturally during a burst on a nick
349 * collision with TS5, we cant kill them because one client has to
350 * survive, so we just send an error.
352 if(IsServer(source_p
) || IsMe(source_p
))
354 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
355 "Message for %s[%s] from %s",
356 source_p
->name
, source_p
->from
->name
,
361 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
362 "Message for %s[%s@%s!%s] from %s (TS, ignored)",
366 source_p
->from
->name
,
373 * inputs - client who gave us message, supposed sender, buffer
375 * side effects - kills issued for clients, squits for servers
378 remove_unknown(struct Client
*client_p
, const char *lsender
, char *lbuffer
)
380 int slen
= strlen(lsender
);
382 struct Client
*server
;
384 /* meepfoo is a nickname (ignore)
385 * #XXXXXXXX is a UID (KILL)
386 * #XX is a SID (SQUIT)
387 * meep.foo is a server (SQUIT)
389 if((IsDigit(lsender
[0]) && slen
== 3) ||
390 (strchr(lsender
, '.') != NULL
))
392 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
393 "Unknown prefix (%s) from %s, Squitting %s",
394 lbuffer
, client_p
->name
, lsender
);
397 ":%s SQUIT %s :(Unknown prefix (%s) from %s)",
398 get_id(&me
, client_p
), lsender
,
399 lbuffer
, client_p
->name
);
401 else if(!IsDigit(lsender
[0]))
404 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
405 "Invalid prefix (%s) from %s",
406 lbuffer
, client_p
->name
);
409 memcpy(sid
, lsender
, 3);
411 server
= find_server(NULL
, sid
);
412 if (server
!= NULL
&& server
->from
== client_p
)
413 sendto_one(client_p
, ":%s KILL %s :%s (Unknown Client)",
414 get_id(&me
, client_p
), lsender
, me
.name
);
422 * parc number of arguments ('sender' counted as one!)
423 * parv[1]..parv[parc-1]
424 * pointers to additional parameters, this is a NULL
425 * terminated list (parv[parc] == NULL).
428 * Numerics are mostly error reports. If there is something
429 * wrong with the message, just *DROP* it! Don't even think of
430 * sending back a neat error message -- big danger of creating
431 * a ping pong error message...
434 do_numeric(int numeric
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
436 struct Client
*target_p
;
437 struct Channel
*chptr
;
439 if(parc
< 2 || !IsServer(source_p
))
442 /* Remap low number numerics. */
447 * Prepare the parameter portion of the message into 'buffer'.
448 * (Because the buffer is twice as large as the message buffer
449 * for the socket, no overflow can occur here... ...on current
450 * assumptions--bets are off, if these are changed --msa)
451 * Note: if buffer is non-empty, it will begin with SPACE.
455 char *t
= buffer
; /* Current position within the buffer */
457 int tl
; /* current length of presently being built string in t */
458 for (i
= 2; i
< (parc
- 1); i
++)
460 tl
= sprintf(t
, " %s", parv
[i
]);
463 sprintf(t
, " :%s", parv
[parc
- 1]);
466 if((target_p
= find_client(parv
[1])) != NULL
)
471 * We shouldn't get numerics sent to us,
472 * any numerics we do get indicate a bug somewhere..
474 /* ugh. this is here because of nick collisions. when two servers
475 * relink, they burst each other their nicks, then perform collides.
476 * if there is a nick collision, BOTH servers will kill their own
477 * nicks, and BOTH will kill the other servers nick, which wont exist,
478 * because it will have been already killed by the local server.
480 * unfortunately, as we cant guarantee other servers will do the
481 * "right thing" on a nick collision, we have to keep both kills.
482 * ergo we need to ignore ERR_NOSUCHNICK. --fl_
484 /* quick comment. This _was_ tried. i.e. assume the other servers
485 * will do the "right thing" and kill a nick that is colliding.
486 * unfortunately, it did not work. --Dianora
488 /* note, now we send PING on server connect, we can
489 * also get ERR_NOSUCHSERVER..
491 if(numeric
!= ERR_NOSUCHNICK
&&
492 numeric
!= ERR_NOSUCHSERVER
)
493 sendto_realops_snomask(SNO_GENERAL
, L_ADMIN
,
494 "*** %s(via %s) sent a %03d numeric to me: %s",
496 client_p
->name
, numeric
, buffer
);
499 else if(target_p
->from
== client_p
)
501 /* This message changed direction (nick collision?)
507 /* csircd will send out unknown umode flag for +a (admin), drop it here. */
508 if(numeric
== ERR_UMODEUNKNOWNFLAG
&& MyClient(target_p
))
511 /* Fake it for server hiding, if its our client */
512 sendto_one(target_p
, ":%s %03d %s%s",
513 get_id(source_p
, target_p
), numeric
,
514 get_id(target_p
, target_p
), buffer
);
517 else if((chptr
= find_channel(parv
[1])) != NULL
)
518 sendto_channel_flags(client_p
, ALL_MEMBERS
, source_p
, chptr
,
520 numeric
, chptr
->chname
, buffer
);
523 static void do_alias(struct alias_entry
*aptr
, struct Client
*source_p
, char *text
)
526 struct Client
*target_p
;
528 if (!IsFloodDone(source_p
) && source_p
->localClient
->receiveM
> 20)
529 flood_endgrace(source_p
);
531 p
= strchr(aptr
->target
, '@');
535 target_p
= find_server(NULL
, p
+ 1);
536 if (target_p
!= NULL
&& IsMe(target_p
))
541 /* nick, must be +S */
542 target_p
= find_named_person(aptr
->target
);
543 if (target_p
!= NULL
&& !IsService(target_p
))
547 if (target_p
== NULL
)
549 sendto_one_numeric(source_p
, ERR_SERVICESDOWN
, form_str(ERR_SERVICESDOWN
), aptr
->target
);
553 if (text
!= NULL
&& *text
== ':')
555 if (text
== NULL
|| *text
== '\0')
557 sendto_one(source_p
, form_str(ERR_NOTEXTTOSEND
), me
.name
, source_p
->name
);
561 /* increment the hitcounter on this alias */
564 sendto_one(target_p
, ":%s PRIVMSG %s :%s",
565 get_id(source_p
, target_p
),
566 p
!= NULL
? aptr
->target
: get_id(target_p
, target_p
),
571 m_not_oper(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
573 sendto_one_numeric(source_p
, ERR_NOPRIVILEGES
, form_str(ERR_NOPRIVILEGES
));
577 m_unregistered(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
580 * I don't =really= want to waste a bit in a flag
581 * number_of_nick_changes is only really valid after the client
582 * is fully registered..
584 if(client_p
->localClient
->number_of_nick_changes
== 0)
586 sendto_one(client_p
, form_str(ERR_NOTREGISTERED
), me
.name
);
587 client_p
->localClient
->number_of_nick_changes
++;
592 m_registered(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
594 sendto_one(client_p
, form_str(ERR_ALREADYREGISTRED
), me
.name
, source_p
->name
);
598 m_ignore(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])