2 * IRC - Internet Relay Chat, common/parse.c
3 * Copyright (C) 1990 Jarkko Oikarinen and
4 * University of Oulu, Computing Center
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 1, or (at your option)
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 * @brief Parse input from IRC clients and other servers.
22 * @version $Id: parse.c 1827 2007-08-14 03:02:24Z entrope $
32 #include "ircd_alloc.h"
33 #include "ircd_chattr.h"
34 #include "ircd_features.h"
36 #include "ircd_reply.h"
37 #include "ircd_string.h"
42 #include "querycmds.h"
48 #include "s_numeric.h"
56 /* #include <assert.h> -- Now using assert in ircd_log.h */
61 * Message Tree stuff mostly written by orabidoo, with changes by Dianora.
62 * Adapted to Undernet, adding token support, etc by comstud 10/06/97
64 * completely rewritten June 2, 2003 - Dianora
66 * This has always just been a trie. Look at volume III of Knuth ACP
69 * ok, you start out with an array of pointers, each one corresponds
70 * to a letter at the current position in the command being examined.
72 * so roughly you have this for matching 'trie' or 'tie'
74 * 't' points -> [MessageTree *] 'r' -> [MessageTree *] -> 'i'
75 * -> [MessageTree *] -> [MessageTree *] -> 'e' and matches
77 * 'i' -> [MessageTree *] -> 'e' and matches
80 /** Number of children under a trie node. */
81 #define MAXPTRLEN 32 /* Must be a power of 2, and
82 * larger than 26 [a-z]|[A-Z]
83 * its used to allocate the set
84 * of pointers at each node of the tree
85 * There are MAXPTRLEN pointers at each node.
86 * Obviously, there have to be more pointers
87 * Than ASCII letters. 32 is a nice number
88 * since there is then no need to shift
89 * 'A'/'a' to base 0 index, at the expense
90 * of a few never used pointers. For a small
91 * parser like this, this is a good compromise
92 * and does make it somewhat faster.
97 /** Node in the command lookup trie. */
99 struct Message *msg; /**< Message (if any) if the string ends now. */
100 struct MessageTree *pointers[MAXPTRLEN]; /**< Child nodes for each letter. */
103 /** Root of command lookup trie. */
104 static struct MessageTree msg_tree;
105 static struct MessageTree tok_tree;
107 /** Array of all supported commands. */
108 struct Message msgtab[] = {
112 0, MAXPARA, MFLG_SLOW, 0, NULL,
113 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
114 { m_unregistered, m_privmsg, ms_privmsg, mo_privmsg, m_ignore }
119 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0, NULL,
120 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
121 { m_nick, m_nick, ms_nick, m_nick, m_ignore }
126 0, MAXPARA, MFLG_SLOW | MFLG_IGNORE, 0, NULL,
127 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
128 { m_ignore, m_notice, ms_notice, mo_notice, m_ignore }
133 0, MAXPARA, MFLG_SLOW, 0, NULL,
134 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
135 { m_unregistered, m_wallchops, ms_wallchops, m_wallchops, m_ignore }
140 0, MAXPARA, MFLG_SLOW, 0, NULL,
141 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
142 { m_unregistered, m_wallvoices, ms_wallvoices, m_wallvoices, m_ignore }
147 0, MAXPARA, MFLG_SLOW, 0, NULL,
148 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
149 { m_unregistered, m_cprivmsg, m_ignore, m_cprivmsg, m_ignore }
154 0, MAXPARA, MFLG_SLOW, 0, NULL,
155 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
156 { m_unregistered, m_cnotice, m_ignore, m_cnotice, m_ignore }
161 0, MAXPARA, MFLG_SLOW, 0, NULL,
162 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
163 { m_unregistered, m_join, ms_join, m_join, m_ignore }
168 0, MAXPARA, MFLG_SLOW, 0, NULL,
169 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
170 { m_unregistered, m_mode, ms_mode, m_mode, m_ignore }
175 0, MAXPARA, MFLG_SLOW, 0, NULL,
176 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
177 { m_ignore, m_ignore, ms_burst, m_ignore, m_ignore }
182 0, MAXPARA, MFLG_SLOW, 0, NULL,
183 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
184 { m_ignore, m_ignore, ms_create, m_ignore, m_ignore }
189 0, MAXPARA, MFLG_SLOW, 0, NULL,
190 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
191 { m_ignore, m_ignore, ms_destruct, m_ignore, m_ignore }
196 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0, NULL,
197 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
198 { m_quit, m_quit, ms_quit, m_quit, m_ignore }
203 0, MAXPARA, MFLG_SLOW, 0, NULL,
204 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
205 { m_unregistered, m_part, ms_part, m_part, m_ignore }
210 0, MAXPARA, MFLG_SLOW, 0, NULL,
211 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
212 { m_unregistered, m_topic, ms_topic, m_topic, m_ignore }
217 0, MAXPARA, MFLG_SLOW, 0, NULL,
218 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
219 { m_unregistered, m_invite, ms_invite, m_invite, m_ignore }
224 0, MAXPARA, MFLG_SLOW, 0, NULL,
225 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
226 { m_unregistered, m_kick, ms_kick, m_kick, m_ignore }
231 0, MAXPARA, MFLG_SLOW, 0, NULL,
232 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
233 { m_unregistered, m_not_oper, ms_wallops, mo_wallops, m_ignore }
238 0, MAXPARA, MFLG_SLOW, 0, NULL,
239 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
240 { m_unregistered, m_not_oper, ms_wallusers, mo_wallusers, m_ignore }
245 0, MAXPARA, MFLG_SLOW, 0, NULL,
246 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
247 { m_ignore, m_ignore, ms_desynch, m_ignore, m_ignore }
252 0, MAXPARA, MFLG_SLOW, 0, NULL,
253 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
254 { m_unregistered, m_ping, ms_ping, mo_ping, m_ignore }
259 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0, NULL,
260 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
261 { mr_pong, m_pong, ms_pong, m_pong, m_ignore }
266 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0, NULL,
267 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
268 { mr_error, m_ignore, ms_error, m_ignore, m_ignore }
273 0, MAXPARA, MFLG_SLOW, 0, NULL,
274 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
275 { m_unregistered, m_not_oper, ms_kill, mo_kill, m_ignore }
280 0, MAXPARA, MFLG_SLOW, 0, NULL,
281 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
282 { m_user, m_registered, m_ignore, m_registered, m_ignore }
287 0, MAXPARA, MFLG_SLOW, 0, NULL,
288 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
289 { m_unregistered, m_away, ms_away, m_away, m_ignore }
294 0, 1, MFLG_SLOW, 0, NULL,
295 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
296 { m_unregistered, m_ison, m_ignore, m_ison, m_ignore }
301 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0, NULL,
302 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
303 { mr_server, m_registered, ms_server, m_registered, m_ignore }
308 0, MAXPARA, MFLG_SLOW, 0, NULL,
309 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
310 { m_unregistered, m_not_oper, ms_squit, mo_squit, m_ignore }
315 0, MAXPARA, MFLG_SLOW, 0, NULL,
316 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
317 { m_unregistered, m_whois, ms_whois, m_whois, m_ignore }
322 0, MAXPARA, MFLG_SLOW, 0, NULL,
323 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
324 { m_unregistered, m_who, m_ignore, m_who, m_ignore }
329 0, MAXPARA, MFLG_SLOW, 0, NULL,
330 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
331 { m_unregistered, m_whowas, m_whowas, m_whowas, m_ignore }
336 0, MAXPARA, MFLG_SLOW, 0, NULL,
337 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
338 { m_unregistered, m_list, m_ignore, m_list, m_ignore }
343 0, MAXPARA, MFLG_SLOW, 0, NULL,
344 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
345 { m_unregistered, m_names, m_names, m_names, m_ignore }
350 0, 1, MFLG_SLOW, 0, NULL,
351 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
352 { m_unregistered, m_userhost, m_ignore, m_userhost, m_ignore }
357 0, 1, MFLG_SLOW, 0, NULL,
358 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
359 { m_unregistered, m_userip, m_ignore, m_userip, m_ignore }
364 0, MAXPARA, MFLG_SLOW, 0, NULL,
365 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
366 { m_unregistered, m_trace, ms_trace, mo_trace, m_ignore }
371 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0, NULL,
372 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
373 { mr_pass, m_registered, m_ignore, m_registered, m_ignore }
378 0, MAXPARA, MFLG_SLOW, 0, NULL,
379 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
380 { m_unregistered, m_lusers, ms_lusers, m_lusers, m_ignore }
385 0, MAXPARA, MFLG_SLOW, 0, NULL,
386 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
387 { m_unregistered, m_time, m_time, m_time, m_ignore }
392 0, MAXPARA, MFLG_SLOW, 0, NULL,
393 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
394 { m_unregistered, m_not_oper, ms_settime, mo_settime, m_ignore }
399 0, MAXPARA, MFLG_SLOW, 0, NULL,
400 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
401 { m_unregistered, m_not_oper, ms_rping, mo_rping, m_ignore }
406 0, MAXPARA, MFLG_SLOW, 0, NULL,
407 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
408 { m_unregistered, m_ignore, ms_rpong, m_ignore, m_ignore }
413 0, MAXPARA, MFLG_SLOW, 0, NULL,
414 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
415 { m_unregistered, m_oper, ms_oper, mo_oper, m_ignore }
420 0, MAXPARA, MFLG_SLOW, 0, NULL,
421 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
422 { m_unregistered, m_not_oper, ms_connect, mo_connect, m_ignore }
427 0, MAXPARA, MFLG_SLOW, 0, NULL,
428 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
429 { m_unregistered, m_map, m_ignore, m_map, m_ignore }
434 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0, NULL,
435 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
436 { m_version, m_version, ms_version, mo_version, m_ignore }
441 0, MAXPARA, MFLG_SLOW, 0, NULL,
442 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
443 { m_unregistered, m_stats, m_stats, m_stats, m_ignore }
448 0, MAXPARA, MFLG_SLOW, 0, NULL,
449 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
450 { m_unregistered, m_links, ms_links, m_links, m_ignore }
455 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0, NULL,
456 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
457 { m_admin, m_admin, ms_admin, mo_admin, m_ignore }
462 0, MAXPARA, MFLG_SLOW, 0, NULL,
463 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
464 { m_unregistered, m_help, m_ignore, m_help, m_ignore }
469 0, MAXPARA, MFLG_SLOW, 0, NULL,
470 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
471 { m_unregistered, m_info, ms_info, mo_info, m_ignore }
476 0, MAXPARA, MFLG_SLOW, 0, NULL,
477 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
478 { m_unregistered, m_motd, m_motd, m_motd, m_ignore }
483 0, MAXPARA, MFLG_SLOW, 0, NULL,
484 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
485 { m_unregistered, m_not_oper, m_ignore, mo_close, m_ignore }
490 0, MAXPARA, MFLG_SLOW, 0, NULL,
491 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
492 { m_unregistered, m_silence, ms_silence, m_silence, m_ignore }
497 0, MAXPARA, 0, 0, NULL,
498 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
499 { m_unregistered, m_gline, ms_gline, mo_gline, m_ignore }
504 0, MAXPARA, MFLG_SLOW, 0, NULL,
505 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
506 { m_unregistered, m_not_oper, ms_jupe, mo_jupe, m_ignore }
511 0, MAXPARA, MFLG_SLOW, 0, NULL,
512 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
513 { m_unregistered, mo_opmode, ms_opmode, mo_opmode, m_ignore }
518 0, MAXPARA, MFLG_SLOW, 0, NULL,
519 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
520 { m_unregistered, m_not_oper, ms_clearmode, mo_clearmode, m_ignore }
525 0, MAXPARA, MFLG_SLOW, 0, NULL,
526 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
527 { m_unregistered, m_not_oper, ms_uping, mo_uping, m_ignore }
532 0, MAXPARA, MFLG_SLOW, 0, NULL,
533 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
534 { m_ignore, m_ignore, ms_end_of_burst, m_ignore, m_ignore }
537 MSG_END_OF_BURST_ACK,
538 TOK_END_OF_BURST_ACK,
539 0, MAXPARA, MFLG_SLOW, 0, NULL,
540 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
541 { m_ignore, m_ignore, ms_end_of_burst_ack, m_ignore, m_ignore }
546 0, MAXPARA, MFLG_SLOW, 0, NULL,
547 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
548 { m_unregistered, m_hash, m_hash, m_hash, m_ignore }
553 0, MAXPARA, MFLG_SLOW, 0, NULL,
554 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
555 { m_unregistered, m_not_oper, ms_rehash, mo_rehash, m_ignore }
560 0, MAXPARA, MFLG_SLOW, 0, NULL,
561 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
562 { m_unregistered, m_not_oper, m_ignore, mo_restart, m_ignore }
567 0, MAXPARA, MFLG_SLOW, 0, NULL,
568 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
569 { m_unregistered, m_not_oper, m_ignore, mo_die, m_ignore }
574 0, MAXPARA, MFLG_SLOW, 0, NULL,
575 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
576 { m_proto, m_proto, m_proto, m_proto, m_ignore }
581 0, MAXPARA, MFLG_SLOW, 0, NULL,
582 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
583 { m_unregistered, m_not_oper, m_ignore, mo_set, m_ignore }
588 0, MAXPARA, MFLG_SLOW, 0, NULL,
589 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
590 { m_unregistered, m_not_oper, m_ignore, mo_reset, m_ignore }
595 0, MAXPARA, MFLG_SLOW, 0, NULL,
596 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
597 { m_unregistered, m_not_oper, m_ignore, mo_get, m_ignore }
602 0, MAXPARA, MFLG_SLOW, 0, NULL,
603 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
604 { m_unregistered, m_privs, ms_privs, m_privs, m_ignore }
609 0, MAXPARA, MFLG_SLOW, 0, NULL,
610 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
611 { m_ignore, m_ignore, ms_account, m_ignore, m_ignore }
616 0, MAXPARA, MFLG_SLOW, 0, NULL,
617 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
618 { m_ignore, m_not_oper, ms_asll, mo_asll, m_ignore }
620 #if WE_HAVE_A_REAL_CAPABILITY_NOW
624 0, MAXPARA, 0, 0, NULL,
625 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
626 { m_cap, m_cap, m_ignore, m_cap, m_ignore }
632 0, MAXPARA, MFLG_SLOW, 0, NULL,
633 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
634 { m_ignore, m_not_oper, ms_fakehost, m_fakehost, m_ignore }
639 0, MAXPARA, MFLG_SLOW, 0, NULL,
640 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
641 { m_ignore, m_ignore, ms_fakehost2, m_ignore, m_ignore }
646 0, MAXPARA, MFLG_SLOW, 0, NULL,
647 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
648 { m_ignore, m_not_oper, ms_fakehost_old, m_fakehost, m_ignore }
653 0, MAXPARA, MFLG_SLOW, 0, NULL,
654 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
655 { m_ignore, m_ignore, ms_hidehost, m_ignore, m_ignore }
660 0, MAXPARA, MFLG_SLOW, 0, NULL,
661 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
662 { m_ignore, m_ignore, ms_svsmode, m_svsmode, m_ignore }
667 0, MAXPARA, MFLG_SLOW, 0, NULL,
668 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
669 { m_ignore, m_ignore, ms_svsnick, m_svsnick, m_ignore }
674 0, MAXPARA, MFLG_SLOW, 0, NULL,
675 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
676 { m_ignore, m_ignore, ms_svsnick_old, m_svsnick, m_ignore }
681 0, MAXPARA, MFLG_SLOW, 0, NULL,
682 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
683 { m_ignore, m_ignore, ms_svsjoin, m_svsjoin, m_ignore }
688 0, MAXPARA, MFLG_SLOW, 0, NULL,
689 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
690 { m_webirc, m_registered, m_ignore, m_registered, m_ignore }
695 0, MAXPARA, MFLG_SLOW, 0, NULL,
696 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
697 { m_ignore, m_ignore, ms_relay, m_ignore, m_ignore }
702 0, MAXPARA, MFLG_SLOW, 0, NULL,
703 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
704 { m_ignore, m_not_oper, m_ignore, mo_check, m_ignore }
706 /* This command is an alias for QUIT during the unregistered part of
707 * of the server. This is because someone jumping via a broken web
708 * proxy will send a 'POST' as their first command - which we will
709 * obviously disconnect them immediately for, stopping people abusing
715 0, MAXPARA, MFLG_SLOW, 0, NULL,
716 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
717 { m_quit, m_ignore, m_ignore, m_ignore, m_ignore }
722 /** Array of command parameters. */
723 static char *para[MAXPARA + 2]; /* leave room for prefix and null */
726 /** Add a message to the lookup trie.
727 * @param[in,out] mtree_p Trie node to insert under.
728 * @param[in] msg_p Message to insert.
729 * @param[in] cmd Text of command to insert.
732 add_msg_element(struct MessageTree *mtree_p, struct Message *msg_p, char *cmd)
734 struct MessageTree *ntree_p;
738 mtree_p->msg = msg_p;
742 if ((ntree_p = mtree_p->pointers[*cmd & (MAXPTRLEN-1)]) != NULL)
744 add_msg_element(ntree_p, msg_p, cmd+1);
748 ntree_p = (struct MessageTree *)MyCalloc(sizeof(struct MessageTree), 1);
749 mtree_p->pointers[*cmd & (MAXPTRLEN-1)] = ntree_p;
750 add_msg_element(ntree_p, msg_p, cmd+1);
754 /** Remove a message from the lookup trie.
755 * @param[in,out] mtree_p Trie node to remove command from.
756 * @param[in] cmd Text of command to remove.
759 del_msg_element(struct MessageTree *mtree_p, char *cmd)
761 int slot = *cmd & (MAXPTRLEN-1);
763 /* Either remove leaf message or from appropriate child. */
767 mtree_p->pointers[slot] = del_msg_element(mtree_p->pointers[slot], cmd + 1);
769 /* If current message or any child still exists, keep this node. */
772 for (slot = 0; slot < MAXPTRLEN; ++slot)
773 if (mtree_p->pointers[slot])
776 /* Otherwise, if we're not a root node, free it and return null. */
777 if (mtree_p != &msg_tree && mtree_p != &tok_tree)
782 /** Initialize the message lookup trie with all known commands. */
788 memset(&msg_tree, 0, sizeof(msg_tree));
789 memset(&tok_tree, 0, sizeof(tok_tree));
791 for (i = 0; msgtab[i].cmd != NULL ; i++)
793 add_msg_element(&msg_tree, &msgtab[i], msgtab[i].cmd);
794 add_msg_element(&tok_tree, &msgtab[i], msgtab[i].tok);
798 /** Look up a command in the message trie.
799 * @param cmd Text of command to look up.
800 * @param root Root of message trie.
801 * @return Pointer to matching message, or NULL if non exists.
803 static struct Message *
804 msg_tree_parse(char *cmd, struct MessageTree *root)
806 struct MessageTree *mtree;
808 for (mtree = root; mtree; mtree = mtree->pointers[(*cmd++) & (MAXPTRLEN-1)]) {
809 if (*cmd == '\0' && mtree->msg)
811 else if (!IsAlpha(*cmd))
817 /** Registers a service mapping to the pseudocommand handler.
818 * @param[in] map Service mapping to add.
819 * @return Non-zero on success; zero if a command already used the name.
821 int register_mapping(struct s_map *map)
825 if (msg_tree_parse(map->command, &msg_tree))
828 msg = (struct Message *)MyMalloc(sizeof(struct Message));
829 msg->cmd = map->command;
830 msg->tok = map->command;
833 msg->flags = MFLG_EXTRA;
834 if (!(map->flags & SMAP_FAST))
835 msg->flags |= MFLG_SLOW;
839 msg->handlers[UNREGISTERED_HANDLER] = m_ignore;
840 msg->handlers[CLIENT_HANDLER] = m_pseudo;
841 msg->handlers[SERVER_HANDLER] = m_ignore;
842 msg->handlers[OPER_HANDLER] = m_pseudo;
843 msg->handlers[SERVICE_HANDLER] = m_ignore;
845 add_msg_element(&msg_tree, msg, msg->cmd);
851 /** Removes a service mapping.
852 * @param[in] map Service mapping to remove.
853 * @return Non-zero on success; zero if no command used the name.
855 int unregister_mapping(struct s_map *map)
857 if (!msg_tree_parse(map->command, &msg_tree))
859 /* This simply should never happen. */
864 del_msg_element(&msg_tree, map->msg->cmd);
866 map->msg->extra = NULL;
873 /** Parse a line of data from a user.
874 * NOTE: parse_*() should not be called recursively by any other
876 * @param[in] cptr Client that sent the data.
877 * @param[in] buffer Start of input line.
878 * @param[in] bufend End of input line.
879 * @return 0 on success, -1 on parse error, or CPTR_KILLED if message
880 * handler returns it.
883 parse_client(struct Client *cptr, char *buffer, char *bufend)
885 struct Client* from = cptr;
891 struct Message* mptr;
892 MessageHandler handler = 0;
894 Debug((DEBUG_DEBUG, "Client Parsing: %s", buffer));
899 para[0] = cli_name(from);
900 for (ch = buffer; *ch == ' '; ch++); /* Eat leading spaces */
901 if (*ch == ':') /* Is any client doing this ? */
903 for (++ch; *ch && *ch != ' '; ++ch)
904 ; /* Ignore sender prefix from client */
906 ch++; /* Advance to command */
912 ServerStats->is_empt++;
913 Debug((DEBUG_NOTICE, "Empty message from host %s:%s",
914 cli_name(cptr), cli_name(from)));
918 if ((s = strchr(ch, ' ')))
921 if ((mptr = msg_tree_parse(ch, &msg_tree)) == NULL)
924 * Note: Give error message *only* to recognized
925 * persons. It's a nightmare situation to have
926 * two programs sending "Unknown command"'s or
927 * equivalent to each other at full blast....
928 * If it has got to person state, it at least
929 * seems to be well behaving. Perhaps this message
930 * should never be generated, though... --msa
931 * Hm, when is the buffer empty -- if a command
932 * code has been found ?? -Armin
934 if (buffer[0] != '\0')
937 struct Client *acptr;
938 if(feature_bool(FEAT_UNKNOWN_CMD_ENABLE) && feature_str(FEAT_UNKNOWN_CMD_TARGET) && (acptr = FindUser(feature_str(FEAT_UNKNOWN_CMD_TARGET))) && IsNetServ(acptr) && IsService(cli_user(acptr)->server)) {
939 sendcmdto_one(&me, CMD_RELAY, acptr, "%C UC %C %s :%s", acptr, from, ch, s);
941 send_reply(from, ERR_UNKNOWNCOMMAND, ch);
944 Debug((DEBUG_ERROR, "Unknown (%s) from %s",
945 ch, get_client_name(cptr, HIDE_IP)));
947 ServerStats->is_unco++;
951 paramcount = mptr->parameters;
952 i = bufend - ((s) ? s : ch);
954 if ((mptr->flags & MFLG_SLOW) || (!IsAnOper(cptr) && !HasPriv(cptr, PRIV_FLOOD))) {
955 if(HasPriv(cptr, PRIV_HALFFLOOD))
956 cli_since(cptr) += 1;
958 cli_since(cptr) += (2 + i / 120);
962 * Allow only 1 msg per 2 seconds
963 * (on average) to prevent dumping.
964 * to keep the response rate up,
965 * bursts of up to 5 msgs are allowed
970 * Must the following loop really be so devious? On
971 * surface it splits the message to parameters from
972 * blank spaces. But, if paramcount has been reached,
973 * the rest of the message goes into this last parameter
974 * (about same effect as ":" has...) --msa
977 /* Note initially true: s==NULL || *(s-1) == '\0' !! */
979 if (mptr->flags & MFLG_EXTRA) {
980 /* This is a horrid kludge to avoid changing the command handler
982 para[1] = (char*)mptr->extra;
989 if (paramcount > MAXPARA)
990 paramcount = MAXPARA;
994 * Never "FRANCE " again!! ;-) Clean
995 * out *all* blanks.. --msa
1005 * The rest is single parameter--can
1006 * include blanks also.
1012 if (i >= paramcount)
1014 for (; *s != ' ' && *s; s++);
1020 handler = mptr->handlers[cli_handler(cptr)];
1021 assert(0 != handler);
1023 if (!feature_bool(FEAT_IDLE_FROM_MSG) && IsUser(cptr) &&
1024 handler != m_ping && handler != m_ignore)
1025 cli_user(from)->last = CurrentTime;
1027 return (*handler) (cptr, from, i, para);
1031 parse_simul_client(struct Client *cptr, char *buffer)
1033 struct Client* from = cptr;
1039 struct Message* mptr;
1040 MessageHandler handler = 0;
1042 Debug((DEBUG_DEBUG, "Client Parsing: %s", buffer));
1047 para[0] = cli_name(from);
1048 for (ch = buffer; *ch == ' '; ch++); /* Eat leading spaces */
1049 if (*ch == ':') /* Is any client doing this ? */
1051 for (++ch; *ch && *ch != ' '; ++ch)
1052 ; /* Ignore sender prefix from client */
1054 ch++; /* Advance to command */
1060 ServerStats->is_empt++;
1061 Debug((DEBUG_NOTICE, "Empty message from host %s:%s",
1062 cli_name(cptr), cli_name(from)));
1066 if ((s = strchr(ch, ' ')))
1069 if ((mptr = msg_tree_parse(ch, &msg_tree)) == NULL)
1072 * Note: Give error message *only* to recognized
1073 * persons. It's a nightmare situation to have
1074 * two programs sending "Unknown command"'s or
1075 * equivalent to each other at full blast....
1076 * If it has got to person state, it at least
1077 * seems to be well behaving. Perhaps this message
1078 * should never be generated, though... --msa
1079 * Hm, when is the buffer empty -- if a command
1080 * code has been found ?? -Armin
1082 if (buffer[0] != '\0')
1084 Debug((DEBUG_ERROR, "Unknown (%s) from %s",
1085 ch, get_client_name(cptr, HIDE_IP)));
1087 ServerStats->is_unco++;
1091 paramcount = mptr->parameters;
1094 * Allow only 1 msg per 2 seconds
1095 * (on average) to prevent dumping.
1096 * to keep the response rate up,
1097 * bursts of up to 5 msgs are allowed
1102 * Must the following loop really be so devious? On
1103 * surface it splits the message to parameters from
1104 * blank spaces. But, if paramcount has been reached,
1105 * the rest of the message goes into this last parameter
1106 * (about same effect as ":" has...) --msa
1109 /* Note initially true: s==NULL || *(s-1) == '\0' !! */
1111 if (mptr->flags & MFLG_EXTRA) {
1112 /* This is a horrid kludge to avoid changing the command handler
1114 para[1] = (char*)mptr->extra;
1121 if (paramcount > MAXPARA)
1122 paramcount = MAXPARA;
1126 * Never "FRANCE " again!! ;-) Clean
1127 * out *all* blanks.. --msa
1137 * The rest is single parameter--can
1138 * include blanks also.
1144 if (i >= paramcount)
1146 for (; *s != ' ' && *s; s++);
1152 handler = mptr->handlers[cli_handler(cptr)];
1153 assert(0 != handler);
1155 if (!feature_bool(FEAT_IDLE_FROM_MSG) && IsUser(cptr) &&
1156 handler != m_ping && handler != m_ignore)
1157 cli_user(from)->last = CurrentTime;
1159 return (*handler) (cptr, from, i, para);
1164 /** Parse a line of data from a server.
1165 * @param[in] cptr Client that sent the data.
1166 * @param[in] buffer Start of input line.
1167 * @param[in] bufend End of input line.
1168 * @return 0 on success, -1 on parse error, or CPTR_KILLED if message
1169 * handler returns it.
1171 int parse_server(struct Client *cptr, char *buffer, char *bufend)
1173 struct Client* from = cptr;
1180 struct Message* mptr;
1182 Debug((DEBUG_DEBUG, "Server Parsing: %s", buffer));
1187 para[0] = cli_name(from);
1190 * A server ALWAYS sends a prefix. When it starts with a ':' it's the
1191 * protocol 9 prefix: a nick or a server name. Otherwise it's a numeric
1196 /* Let para[0] point to the name of the sender */
1198 if (!(ch = strchr(ch, ' ')))
1202 /* And let `from' point to its client structure,
1203 opps.. a server is _also_ a client --Nem */
1204 from = FindClient(para[0]);
1207 * If the client corresponding to the
1208 * prefix is not found. We must ignore it,
1209 * it is simply a lagged message traveling
1210 * upstream a SQUIT that removed the client
1215 Debug((DEBUG_NOTICE, "Unknown prefix (%s)(%s) from (%s)",
1216 para[0], buffer, cli_name(cptr)));
1217 ++ServerStats->is_unpf;
1221 * However, the only thing that MUST be
1222 * allowed to travel upstream against an
1223 * squit, is an SQUIT itself (the timestamp
1224 * protects us from being used wrong)
1228 para[0] = cli_name(cptr);
1234 else if (cli_from(from) != cptr)
1236 ++ServerStats->is_wrdi;
1237 Debug((DEBUG_NOTICE, "Fake direction: Message (%s) coming from (%s)",
1238 buffer, cli_name(cptr)));
1244 char numeric_prefix[6];
1246 for (i = 0; i < 5; ++i)
1248 if ('\0' == ch[i] || ' ' == (numeric_prefix[i] = ch[i]))
1253 numeric_prefix[i] = '\0';
1256 * We got a numeric nick as prefix
1257 * 1 or 2 character prefixes are from servers
1258 * 3 or 5 chars are from clients
1262 protocol_violation(cptr,"Missing Prefix");
1265 else if (' ' == ch[1] || ' ' == ch[2])
1266 from = FindNServer(numeric_prefix);
1268 from = findNUser(numeric_prefix);
1274 while (*ch != ' ' && *ch);
1277 * If the client corresponding to the
1278 * prefix is not found. We must ignore it,
1279 * it is simply a lagged message traveling
1280 * upstream a SQUIT that removed the client
1282 * There turned out to be other reasons that
1283 * a prefix is unknown, needing an upstream
1284 * KILL. Also, next to an SQUIT we better
1285 * allow a KILL to pass too.
1290 ServerStats->is_unpf++;
1293 if (*ch == 'N' && (ch[1] == ' ' || ch[1] == 'I'))
1294 /* Only sent a KILL for a nick change */
1296 struct Client *server;
1297 /* Kill the unknown numeric prefix upstream if
1298 * it's server still exists: */
1299 if ((server = FindNServer(numeric_prefix)) && cli_from(server) == cptr)
1300 sendcmdto_one(&me, CMD_KILL, cptr, "%s :%s (Unknown numeric nick)",
1301 numeric_prefix, cli_name(&me));
1304 * Things that must be allowed to travel
1305 * upstream against an squit:
1307 if (ch[1] == 'Q' || (*ch == 'D' && ch[1] == ' ') ||
1308 (*ch == 'K' && ch[2] == 'L'))
1314 /* Let para[0] point to the name of the sender */
1315 para[0] = cli_name(from);
1317 if (cli_from(from) != cptr)
1319 ServerStats->is_wrdi++;
1320 Debug((DEBUG_NOTICE, "Fake direction: Message (%s) coming from (%s)",
1321 buffer, cli_name(cptr)));
1330 ServerStats->is_empt++;
1331 Debug((DEBUG_NOTICE, "Empty message from host %s:%s",
1332 cli_name(cptr), cli_name(from)));
1337 * Extract the command code from the packet. Point s to the end
1338 * of the command code and calculate the length using pointer
1339 * arithmetic. Note: only need length for numerics and *all*
1340 * numerics must have parameters and thus a space after the command
1343 s = strchr(ch, ' '); /* s -> End of the command code */
1344 len = (s) ? (s - ch) : 0;
1345 if (len == 3 && IsDigit(*ch))
1347 numeric = (*ch - '0') * 100 + (*(ch + 1) - '0') * 10 + (*(ch + 2) - '0');
1348 paramcount = 2; /* destination, and the rest of it */
1349 ServerStats->is_num++;
1350 mptr = NULL; /* Init. to avoid stupid compiler warning :/ */
1357 /* Version Receive Send
1359 * 2.10.0 Tkn/Long Long
1360 * 2.10.10 Tkn/Long Tkn
1363 * Clients/unreg servers always receive/
1364 * send long commands -record
1366 * And for the record, this trie parser really does not care. - Dianora
1369 mptr = msg_tree_parse(ch, &tok_tree);
1373 mptr = msg_tree_parse(ch, &msg_tree);
1379 * Note: Give error message *only* to recognized
1380 * persons. It's a nightmare situation to have
1381 * two programs sending "Unknown command"'s or
1382 * equivalent to each other at full blast....
1383 * If it has got to person state, it at least
1384 * seems to be well behaving. Perhaps this message
1385 * should never be generated, though... --msa
1386 * Hm, when is the buffer empty -- if a command
1387 * code has been found ?? -Armin
1390 if (buffer[0] != '\0')
1392 Debug((DEBUG_ERROR, "Unknown (%s) from %s",
1393 ch, get_client_name(cptr, HIDE_IP)));
1396 ServerStats->is_unco++;
1400 paramcount = mptr->parameters;
1401 i = bufend - ((s) ? s : ch);
1405 * Must the following loop really be so devious? On
1406 * surface it splits the message to parameters from
1407 * blank spaces. But, if paramcount has been reached,
1408 * the rest of the message goes into this last parameter
1409 * (about same effect as ":" has...) --msa
1412 /* Note initially true: s==NULL || *(s-1) == '\0' !! */
1417 if (paramcount > MAXPARA)
1418 paramcount = MAXPARA;
1422 * Never "FRANCE " again!! ;-) Clean
1423 * out *all* blanks.. --msa
1433 * The rest is single parameter--can
1434 * include blanks also.
1437 para[++i] = s; /* preserve the colon to make do_numeric happy */
1443 if (i >= paramcount)
1445 for (; *s != ' ' && *s; s++);
1450 return (do_numeric(numeric, (*buffer != ':'), cptr, from, i, para));
1453 return (*mptr->handlers[cli_handler(cptr)]) (cptr, from, i, para);