]>
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
++;
148 mptr
->bytes
+= msgbuf
.parselen
;
153 do_numeric(numeric
, client_p
, from
, msgbuf
.n_para
, msgbuf
.para
);
157 if(handle_command(mptr
, &msgbuf
, client_p
, from
) < -1)
160 for (p
= pbuffer
; p
<= end
; p
+= 8)
163 /* Its expected this nasty code can be removed
164 * or rewritten later if still needed.
168 for (; p
<= end
; p
++)
170 ilog(L_MAIN
, "%02x |%c", p
[0], p
[0]);
175 "%02x %02x %02x %02x %02x %02x %02x %02x |%c%c%c%c%c%c%c%c",
176 p
[0], p
[1], p
[2], p
[3], p
[4], p
[5],
177 p
[6], p
[7], p
[0], p
[1], p
[2], p
[3], p
[4], p
[5], p
[6], p
[7]);
186 * inputs - pointer to message block
187 * - pointer to message buffer
188 * - pointer to client
189 * - pointer to client message is from
190 * output - -1 if error from server
194 handle_command(struct Message
*mptr
, struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*from
)
196 struct MessageEntry ehandler
;
197 MessageHandler handler
= 0;
198 char squitreason
[80];
200 if(IsAnyDead(client_p
))
203 if(IsServer(client_p
))
208 ehandler
= mptr
->handlers
[from
->handler
];
209 handler
= ehandler
.handler
;
211 /* check right amount of params is passed... --is */
212 if(msgbuf_p
->n_para
< ehandler
.min_para
||
213 (ehandler
.min_para
&& EmptyString(msgbuf_p
->para
[ehandler
.min_para
- 1])))
215 if(!IsServer(client_p
))
217 sendto_one(client_p
, form_str(ERR_NEEDMOREPARAMS
),
219 EmptyString(client_p
->name
) ? "*" : client_p
->name
,
221 if(MyClient(client_p
))
227 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
228 "Dropping server %s due to (invalid) command '%s'"
229 " with only %zu arguments (expecting %zu).",
230 client_p
->name
, mptr
->cmd
, msgbuf_p
->n_para
, ehandler
.min_para
);
232 "Insufficient parameters (%zu < %zu) for command '%s' from %s.",
233 msgbuf_p
->n_para
, ehandler
.min_para
, mptr
->cmd
, client_p
->name
);
234 snprintf(squitreason
, sizeof squitreason
,
235 "Insufficient parameters (%zu < %zu) for command '%s'",
236 msgbuf_p
->n_para
, ehandler
.min_para
, mptr
->cmd
);
237 exit_client(client_p
, client_p
, client_p
, squitreason
);
241 (*handler
) (msgbuf_p
, client_p
, from
, msgbuf_p
->n_para
, msgbuf_p
->para
);
246 handle_encap(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
,
247 const char *command
, int parc
, const char *parv
[])
249 struct Message
*mptr
;
250 struct MessageEntry ehandler
;
251 MessageHandler handler
= 0;
253 mptr
= rb_dictionary_retrieve(cmd_dict
, command
);
255 if(mptr
== NULL
|| mptr
->cmd
== NULL
)
258 ehandler
= mptr
->handlers
[ENCAP_HANDLER
];
259 handler
= ehandler
.handler
;
261 if((size_t)parc
< ehandler
.min_para
||
262 (ehandler
.min_para
&& EmptyString(parv
[ehandler
.min_para
- 1])))
265 (*handler
) (msgbuf_p
, client_p
, source_p
, parc
, parv
);
273 * side effects - MUST MUST be called at startup ONCE before
274 * any other keyword hash routine is used.
279 cmd_dict
= rb_dictionary_create("command", rb_strcasecmp
);
284 * inputs - command name
285 * - pointer to struct Message
287 * side effects - load this one command name
288 * msg->count msg->bytes is modified in place, in
289 * modules address space. Might not want to do that...
292 mod_add_cmd(struct Message
*msg
)
294 s_assert(msg
!= NULL
);
298 if (rb_dictionary_find(cmd_dict
, msg
->cmd
) != NULL
) {
307 rb_dictionary_add(cmd_dict
, msg
->cmd
, msg
);
312 * inputs - command name
314 * side effects - unload this one command name
317 mod_del_cmd(struct Message
*msg
)
319 s_assert(msg
!= NULL
);
323 if (rb_dictionary_delete(cmd_dict
, msg
->cmd
) == NULL
)
329 * inputs - client who sent us the message, client with fake
331 * outputs - a given warning about the fake direction
335 cancel_clients(struct Client
*client_p
, struct Client
*source_p
)
337 /* ok, fake prefix happens naturally during a burst on a nick
338 * collision with TS5, we cant kill them because one client has to
339 * survive, so we just send an error.
341 if(IsServer(source_p
) || IsMe(source_p
))
343 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
344 "Message for %s[%s] from %s",
345 source_p
->name
, source_p
->from
->name
,
350 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
351 "Message for %s[%s@%s!%s] from %s (TS, ignored)",
355 source_p
->from
->name
,
362 * inputs - client who gave us message, supposed sender, buffer
364 * side effects - kills issued for clients, squits for servers
367 remove_unknown(struct Client
*client_p
, const char *lsender
, char *lbuffer
)
369 int slen
= strlen(lsender
);
371 struct Client
*server
;
373 /* meepfoo is a nickname (ignore)
374 * #XXXXXXXX is a UID (KILL)
375 * #XX is a SID (SQUIT)
376 * meep.foo is a server (SQUIT)
378 if((IsDigit(lsender
[0]) && slen
== 3) ||
379 (strchr(lsender
, '.') != NULL
))
381 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
382 "Unknown prefix (%s) from %s, Squitting %s",
383 lbuffer
, client_p
->name
, lsender
);
386 ":%s SQUIT %s :(Unknown prefix (%s) from %s)",
387 get_id(&me
, client_p
), lsender
,
388 lbuffer
, client_p
->name
);
390 else if(!IsDigit(lsender
[0]))
393 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
394 "Invalid prefix (%s) from %s",
395 lbuffer
, client_p
->name
);
398 memcpy(sid
, lsender
, 3);
400 server
= find_server(NULL
, sid
);
401 if (server
!= NULL
&& server
->from
== client_p
)
402 sendto_one(client_p
, ":%s KILL %s :%s (Unknown Client)",
403 get_id(&me
, client_p
), lsender
, me
.name
);
411 * parc number of arguments ('sender' counted as one!)
412 * parv[1]..parv[parc-1]
413 * pointers to additional parameters, this is a NULL
414 * terminated list (parv[parc] == NULL).
417 * Numerics are mostly error reports. If there is something
418 * wrong with the message, just *DROP* it! Don't even think of
419 * sending back a neat error message -- big danger of creating
420 * a ping pong error message...
423 do_numeric(int numeric
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
425 struct Client
*target_p
;
426 struct Channel
*chptr
;
428 if(parc
< 2 || !IsServer(source_p
))
431 /* Remap low number numerics. */
436 * Prepare the parameter portion of the message into 'buffer'.
437 * (Because the buffer is twice as large as the message buffer
438 * for the socket, no overflow can occur here... ...on current
439 * assumptions--bets are off, if these are changed --msa)
440 * Note: if buffer is non-empty, it will begin with SPACE.
444 char *t
= buffer
; /* Current position within the buffer */
446 int tl
; /* current length of presently being built string in t */
447 for (i
= 2; i
< (parc
- 1); i
++)
449 tl
= sprintf(t
, " %s", parv
[i
]);
452 sprintf(t
, " :%s", parv
[parc
- 1]);
455 if((target_p
= find_client(parv
[1])) != NULL
)
460 * We shouldn't get numerics sent to us,
461 * any numerics we do get indicate a bug somewhere..
463 /* ugh. this is here because of nick collisions. when two servers
464 * relink, they burst each other their nicks, then perform collides.
465 * if there is a nick collision, BOTH servers will kill their own
466 * nicks, and BOTH will kill the other servers nick, which wont exist,
467 * because it will have been already killed by the local server.
469 * unfortunately, as we cant guarantee other servers will do the
470 * "right thing" on a nick collision, we have to keep both kills.
471 * ergo we need to ignore ERR_NOSUCHNICK. --fl_
473 /* quick comment. This _was_ tried. i.e. assume the other servers
474 * will do the "right thing" and kill a nick that is colliding.
475 * unfortunately, it did not work. --Dianora
477 /* note, now we send PING on server connect, we can
478 * also get ERR_NOSUCHSERVER..
480 if(numeric
!= ERR_NOSUCHNICK
&&
481 numeric
!= ERR_NOSUCHSERVER
)
482 sendto_realops_snomask(SNO_GENERAL
, L_ADMIN
,
483 "*** %s(via %s) sent a %03d numeric to me: %s",
485 client_p
->name
, numeric
, buffer
);
488 else if(target_p
->from
== client_p
)
490 /* This message changed direction (nick collision?)
496 /* csircd will send out unknown umode flag for +a (admin), drop it here. */
497 if(numeric
== ERR_UMODEUNKNOWNFLAG
&& MyClient(target_p
))
500 /* Fake it for server hiding, if its our client */
501 sendto_one(target_p
, ":%s %03d %s%s",
502 get_id(source_p
, target_p
), numeric
,
503 get_id(target_p
, target_p
), buffer
);
506 else if((chptr
= find_channel(parv
[1])) != NULL
)
507 sendto_channel_flags(client_p
, ALL_MEMBERS
, source_p
, chptr
,
509 numeric
, chptr
->chname
, buffer
);
513 m_not_oper(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
515 sendto_one_numeric(source_p
, ERR_NOPRIVILEGES
, form_str(ERR_NOPRIVILEGES
));
519 m_unregistered(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
522 * I don't =really= want to waste a bit in a flag
523 * number_of_nick_changes is only really valid after the client
524 * is fully registered..
526 if(client_p
->localClient
->number_of_nick_changes
== 0)
528 sendto_one(client_p
, form_str(ERR_NOTREGISTERED
), me
.name
);
529 client_p
->localClient
->number_of_nick_changes
++;
534 m_registered(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
536 sendto_one(client_p
, form_str(ERR_ALREADYREGISTRED
), me
.name
, source_p
->name
);
540 m_ignore(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])