]>
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
)
305 rb_dictionary_add(cmd_dict
, msg
->cmd
, msg
);
310 * inputs - command name
312 * side effects - unload this one command name
315 mod_del_cmd(struct Message
*msg
)
317 s_assert(msg
!= NULL
);
321 rb_dictionary_delete(cmd_dict
, msg
->cmd
);
326 * inputs - client who sent us the message, client with fake
328 * outputs - a given warning about the fake direction
332 cancel_clients(struct Client
*client_p
, struct Client
*source_p
)
334 /* ok, fake prefix happens naturally during a burst on a nick
335 * collision with TS5, we cant kill them because one client has to
336 * survive, so we just send an error.
338 if(IsServer(source_p
) || IsMe(source_p
))
340 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
341 "Message for %s[%s] from %s",
342 source_p
->name
, source_p
->from
->name
,
347 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
348 "Message for %s[%s@%s!%s] from %s (TS, ignored)",
352 source_p
->from
->name
,
359 * inputs - client who gave us message, supposed sender, buffer
361 * side effects - kills issued for clients, squits for servers
364 remove_unknown(struct Client
*client_p
, const char *lsender
, char *lbuffer
)
366 int slen
= strlen(lsender
);
368 struct Client
*server
;
370 /* meepfoo is a nickname (ignore)
371 * #XXXXXXXX is a UID (KILL)
372 * #XX is a SID (SQUIT)
373 * meep.foo is a server (SQUIT)
375 if((IsDigit(lsender
[0]) && slen
== 3) ||
376 (strchr(lsender
, '.') != NULL
))
378 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
379 "Unknown prefix (%s) from %s, Squitting %s",
380 lbuffer
, client_p
->name
, lsender
);
383 ":%s SQUIT %s :(Unknown prefix (%s) from %s)",
384 get_id(&me
, client_p
), lsender
,
385 lbuffer
, client_p
->name
);
387 else if(!IsDigit(lsender
[0]))
390 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
391 "Invalid prefix (%s) from %s",
392 lbuffer
, client_p
->name
);
395 memcpy(sid
, lsender
, 3);
397 server
= find_server(NULL
, sid
);
398 if (server
!= NULL
&& server
->from
== client_p
)
399 sendto_one(client_p
, ":%s KILL %s :%s (Unknown Client)",
400 get_id(&me
, client_p
), lsender
, me
.name
);
408 * parc number of arguments ('sender' counted as one!)
409 * parv[1]..parv[parc-1]
410 * pointers to additional parameters, this is a NULL
411 * terminated list (parv[parc] == NULL).
414 * Numerics are mostly error reports. If there is something
415 * wrong with the message, just *DROP* it! Don't even think of
416 * sending back a neat error message -- big danger of creating
417 * a ping pong error message...
420 do_numeric(int numeric
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
422 struct Client
*target_p
;
423 struct Channel
*chptr
;
425 if(parc
< 2 || !IsServer(source_p
))
428 /* Remap low number numerics. */
433 * Prepare the parameter portion of the message into 'buffer'.
434 * (Because the buffer is twice as large as the message buffer
435 * for the socket, no overflow can occur here... ...on current
436 * assumptions--bets are off, if these are changed --msa)
437 * Note: if buffer is non-empty, it will begin with SPACE.
441 char *t
= buffer
; /* Current position within the buffer */
443 int tl
; /* current length of presently being built string in t */
444 for (i
= 2; i
< (parc
- 1); i
++)
446 tl
= sprintf(t
, " %s", parv
[i
]);
449 sprintf(t
, " :%s", parv
[parc
- 1]);
452 if((target_p
= find_client(parv
[1])) != NULL
)
457 * We shouldn't get numerics sent to us,
458 * any numerics we do get indicate a bug somewhere..
460 /* ugh. this is here because of nick collisions. when two servers
461 * relink, they burst each other their nicks, then perform collides.
462 * if there is a nick collision, BOTH servers will kill their own
463 * nicks, and BOTH will kill the other servers nick, which wont exist,
464 * because it will have been already killed by the local server.
466 * unfortunately, as we cant guarantee other servers will do the
467 * "right thing" on a nick collision, we have to keep both kills.
468 * ergo we need to ignore ERR_NOSUCHNICK. --fl_
470 /* quick comment. This _was_ tried. i.e. assume the other servers
471 * will do the "right thing" and kill a nick that is colliding.
472 * unfortunately, it did not work. --Dianora
474 /* note, now we send PING on server connect, we can
475 * also get ERR_NOSUCHSERVER..
477 if(numeric
!= ERR_NOSUCHNICK
&&
478 numeric
!= ERR_NOSUCHSERVER
)
479 sendto_realops_snomask(SNO_GENERAL
, L_ADMIN
,
480 "*** %s(via %s) sent a %03d numeric to me: %s",
482 client_p
->name
, numeric
, buffer
);
485 else if(target_p
->from
== client_p
)
487 /* This message changed direction (nick collision?)
493 /* csircd will send out unknown umode flag for +a (admin), drop it here. */
494 if(numeric
== ERR_UMODEUNKNOWNFLAG
&& MyClient(target_p
))
497 /* Fake it for server hiding, if its our client */
498 sendto_one(target_p
, ":%s %03d %s%s",
499 get_id(source_p
, target_p
), numeric
,
500 get_id(target_p
, target_p
), buffer
);
503 else if((chptr
= find_channel(parv
[1])) != NULL
)
504 sendto_channel_flags(client_p
, ALL_MEMBERS
, source_p
, chptr
,
506 numeric
, chptr
->chname
, buffer
);
510 m_not_oper(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
512 sendto_one_numeric(source_p
, ERR_NOPRIVILEGES
, form_str(ERR_NOPRIVILEGES
));
516 m_unregistered(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
519 * I don't =really= want to waste a bit in a flag
520 * number_of_nick_changes is only really valid after the client
521 * is fully registered..
523 if(client_p
->localClient
->number_of_nick_changes
== 0)
525 sendto_one(client_p
, form_str(ERR_NOTREGISTERED
), me
.name
);
526 client_p
->localClient
->number_of_nick_changes
++;
531 m_registered(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
533 sendto_one(client_p
, form_str(ERR_ALREADYREGISTRED
), me
.name
, source_p
->name
);
537 m_ignore(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])