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.
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, m_not_oper, 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, m_ignore, 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_not_oper, ms_privs, mo_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 }
623 0, MAXPARA, MFLG_SLOW, 0, NULL,
624 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
625 { m_ignore, m_ignore, ms_xquery, mo_xquery, m_ignore }
630 0, MAXPARA, MFLG_SLOW, 0, NULL,
631 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
632 { m_ignore, m_ignore, ms_xreply, m_ignore, m_ignore }
634 #if WE_HAVE_A_REAL_CAPABILITY_NOW
638 0, MAXPARA, 0, 0, NULL,
639 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
640 { m_cap, m_cap, m_ignore, m_cap, m_ignore }
643 /* This command is an alias for QUIT during the unregistered part of
644 * of the server. This is because someone jumping via a broken web
645 * proxy will send a 'POST' as their first command - which we will
646 * obviously disconnect them immediately for, stopping people abusing
652 0, MAXPARA, MFLG_SLOW, 0, NULL,
653 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
654 { m_quit, m_ignore, m_ignore, m_ignore, m_ignore }
659 /** Array of command parameters. */
660 static char *para[MAXPARA + 2]; /* leave room for prefix and null */
663 /** Add a message to the lookup trie.
664 * @param[in,out] mtree_p Trie node to insert under.
665 * @param[in] msg_p Message to insert.
666 * @param[in] cmd Text of command to insert.
669 add_msg_element(struct MessageTree *mtree_p, struct Message *msg_p, char *cmd)
671 struct MessageTree *ntree_p;
675 mtree_p->msg = msg_p;
679 if ((ntree_p = mtree_p->pointers[*cmd & (MAXPTRLEN-1)]) != NULL)
681 add_msg_element(ntree_p, msg_p, cmd+1);
685 ntree_p = (struct MessageTree *)MyCalloc(sizeof(struct MessageTree), 1);
686 mtree_p->pointers[*cmd & (MAXPTRLEN-1)] = ntree_p;
687 add_msg_element(ntree_p, msg_p, cmd+1);
691 /** Remove a message from the lookup trie.
692 * @param[in,out] mtree_p Trie node to remove command from.
693 * @param[in] cmd Text of command to remove.
696 del_msg_element(struct MessageTree *mtree_p, char *cmd)
698 int slot = *cmd & (MAXPTRLEN-1);
700 /* Either remove leaf message or from appropriate child. */
704 mtree_p->pointers[slot] = del_msg_element(mtree_p->pointers[slot], cmd + 1);
706 /* If current message or any child still exists, keep this node. */
709 for (slot = 0; slot < MAXPTRLEN; ++slot)
710 if (mtree_p->pointers[slot])
713 /* Otherwise, if we're not a root node, free it and return null. */
714 if (mtree_p != &msg_tree && mtree_p != &tok_tree)
719 /** Initialize the message lookup trie with all known commands. */
725 memset(&msg_tree, 0, sizeof(msg_tree));
726 memset(&tok_tree, 0, sizeof(tok_tree));
728 for (i = 0; msgtab[i].cmd != NULL ; i++)
730 add_msg_element(&msg_tree, &msgtab[i], msgtab[i].cmd);
731 add_msg_element(&tok_tree, &msgtab[i], msgtab[i].tok);
735 /** Look up a command in the message trie.
736 * @param cmd Text of command to look up.
737 * @param root Root of message trie.
738 * @return Pointer to matching message, or NULL if non exists.
740 static struct Message *
741 msg_tree_parse(char *cmd, struct MessageTree *root)
743 struct MessageTree *mtree;
745 for (mtree = root; mtree; mtree = mtree->pointers[(*cmd++) & (MAXPTRLEN-1)]) {
746 if (*cmd == '\0' && mtree->msg)
748 else if (!IsAlpha(*cmd))
754 /** Registers a service mapping to the pseudocommand handler.
755 * @param[in] map Service mapping to add.
756 * @return Non-zero on success; zero if a command already used the name.
758 int register_mapping(struct s_map *map)
762 if (msg_tree_parse(map->command, &msg_tree))
765 msg = (struct Message *)MyMalloc(sizeof(struct Message));
766 msg->cmd = map->command;
767 msg->tok = map->command;
770 msg->flags = MFLG_EXTRA;
771 if (!(map->flags & SMAP_FAST))
772 msg->flags |= MFLG_SLOW;
776 msg->handlers[UNREGISTERED_HANDLER] = m_ignore;
777 msg->handlers[CLIENT_HANDLER] = m_pseudo;
778 msg->handlers[SERVER_HANDLER] = m_ignore;
779 msg->handlers[OPER_HANDLER] = m_pseudo;
780 msg->handlers[SERVICE_HANDLER] = m_ignore;
782 add_msg_element(&msg_tree, msg, msg->cmd);
788 /** Removes a service mapping.
789 * @param[in] map Service mapping to remove.
790 * @return Non-zero on success; zero if no command used the name.
792 int unregister_mapping(struct s_map *map)
794 if (!msg_tree_parse(map->command, &msg_tree))
796 /* This simply should never happen. */
801 del_msg_element(&msg_tree, map->msg->cmd);
803 map->msg->extra = NULL;
810 /** Parse a line of data from a user.
811 * NOTE: parse_*() should not be called recursively by any other
813 * @param[in] cptr Client that sent the data.
814 * @param[in] buffer Start of input line.
815 * @param[in] bufend End of input line.
816 * @return 0 on success, -1 on parse error, or CPTR_KILLED if message
817 * handler returns it.
820 parse_client(struct Client *cptr, char *buffer, char *bufend)
822 struct Client* from = cptr;
828 struct Message* mptr;
829 MessageHandler handler = 0;
831 Debug((DEBUG_DEBUG, "Client Parsing: %s", buffer));
836 para[0] = cli_name(from);
837 for (ch = buffer; *ch == ' '; ch++); /* Eat leading spaces */
838 if (*ch == ':') /* Is any client doing this ? */
840 for (++ch; *ch && *ch != ' '; ++ch)
841 ; /* Ignore sender prefix from client */
843 ch++; /* Advance to command */
849 ServerStats->is_empt++;
850 Debug((DEBUG_NOTICE, "Empty message from host %s:%s",
851 cli_name(cptr), cli_name(from)));
855 if ((s = strchr(ch, ' ')))
858 if ((mptr = msg_tree_parse(ch, &msg_tree)) == NULL)
861 * Note: Give error message *only* to recognized
862 * persons. It's a nightmare situation to have
863 * two programs sending "Unknown command"'s or
864 * equivalent to each other at full blast....
865 * If it has got to person state, it at least
866 * seems to be well behaving. Perhaps this message
867 * should never be generated, though... --msa
868 * Hm, when is the buffer empty -- if a command
869 * code has been found ?? -Armin
871 if (buffer[0] != '\0')
874 send_reply(from, ERR_UNKNOWNCOMMAND, ch);
875 Debug((DEBUG_ERROR, "Unknown (%s) from %s",
876 ch, get_client_name(cptr, HIDE_IP)));
878 ServerStats->is_unco++;
882 paramcount = mptr->parameters;
883 i = bufend - ((s) ? s : ch);
885 if ((mptr->flags & MFLG_SLOW) || !IsAnOper(cptr))
886 cli_since(cptr) += (2 + i / 120);
888 * Allow only 1 msg per 2 seconds
889 * (on average) to prevent dumping.
890 * to keep the response rate up,
891 * bursts of up to 5 msgs are allowed
896 * Must the following loop really be so devious? On
897 * surface it splits the message to parameters from
898 * blank spaces. But, if paramcount has been reached,
899 * the rest of the message goes into this last parameter
900 * (about same effect as ":" has...) --msa
903 /* Note initially true: s==NULL || *(s-1) == '\0' !! */
905 if (mptr->flags & MFLG_EXTRA) {
906 /* This is a horrid kludge to avoid changing the command handler
908 para[1] = (char*)mptr->extra;
915 if (paramcount > MAXPARA)
916 paramcount = MAXPARA;
920 * Never "FRANCE " again!! ;-) Clean
921 * out *all* blanks.. --msa
931 * The rest is single parameter--can
932 * include blanks also.
940 for (; *s != ' ' && *s; s++);
946 handler = mptr->handlers[cli_handler(cptr)];
947 assert(0 != handler);
949 if (!feature_bool(FEAT_IDLE_FROM_MSG) && IsUser(cptr) &&
950 handler != m_ping && handler != m_ignore)
951 cli_user(from)->last = CurrentTime;
953 return (*handler) (cptr, from, i, para);
956 /** Parse a line of data from a server.
957 * @param[in] cptr Client that sent the data.
958 * @param[in] buffer Start of input line.
959 * @param[in] bufend End of input line.
960 * @return 0 on success, -1 on parse error, or CPTR_KILLED if message
961 * handler returns it.
963 int parse_server(struct Client *cptr, char *buffer, char *bufend)
965 struct Client* from = cptr;
972 struct Message* mptr;
974 Debug((DEBUG_DEBUG, "Server Parsing: %s", buffer));
979 para[0] = cli_name(from);
982 * A server ALWAYS sends a prefix. When it starts with a ':' it's the
983 * protocol 9 prefix: a nick or a server name. Otherwise it's a numeric
988 /* Let para[0] point to the name of the sender */
990 if (!(ch = strchr(ch, ' ')))
994 /* And let `from' point to its client structure,
995 opps.. a server is _also_ a client --Nem */
996 from = FindClient(para[0]);
999 * If the client corresponding to the
1000 * prefix is not found. We must ignore it,
1001 * it is simply a lagged message traveling
1002 * upstream a SQUIT that removed the client
1007 Debug((DEBUG_NOTICE, "Unknown prefix (%s)(%s) from (%s)",
1008 para[0], buffer, cli_name(cptr)));
1009 ++ServerStats->is_unpf;
1013 * However, the only thing that MUST be
1014 * allowed to travel upstream against an
1015 * squit, is an SQUIT itself (the timestamp
1016 * protects us from being used wrong)
1020 para[0] = cli_name(cptr);
1026 else if (cli_from(from) != cptr)
1028 ++ServerStats->is_wrdi;
1029 Debug((DEBUG_NOTICE, "Fake direction: Message (%s) coming from (%s)",
1030 buffer, cli_name(cptr)));
1036 char numeric_prefix[6];
1038 for (i = 0; i < 5; ++i)
1040 if ('\0' == ch[i] || ' ' == (numeric_prefix[i] = ch[i]))
1045 numeric_prefix[i] = '\0';
1048 * We got a numeric nick as prefix
1049 * 1 or 2 character prefixes are from servers
1050 * 3 or 5 chars are from clients
1054 protocol_violation(cptr,"Missing Prefix");
1057 else if (' ' == ch[1] || ' ' == ch[2])
1058 from = FindNServer(numeric_prefix);
1060 from = findNUser(numeric_prefix);
1066 while (*ch != ' ' && *ch);
1069 * If the client corresponding to the
1070 * prefix is not found. We must ignore it,
1071 * it is simply a lagged message traveling
1072 * upstream a SQUIT that removed the client
1074 * There turned out to be other reasons that
1075 * a prefix is unknown, needing an upstream
1076 * KILL. Also, next to an SQUIT we better
1077 * allow a KILL to pass too.
1082 ServerStats->is_unpf++;
1085 if (*ch == 'N' && (ch[1] == ' ' || ch[1] == 'I'))
1086 /* Only sent a KILL for a nick change */
1088 struct Client *server;
1089 /* Kill the unknown numeric prefix upstream if
1090 * it's server still exists: */
1091 if ((server = FindNServer(numeric_prefix)) && cli_from(server) == cptr)
1092 sendcmdto_one(&me, CMD_KILL, cptr, "%s :%s (Unknown numeric nick)",
1093 numeric_prefix, cli_name(&me));
1096 * Things that must be allowed to travel
1097 * upstream against an squit:
1099 if (ch[1] == 'Q' || (*ch == 'D' && ch[1] == ' ') ||
1100 (*ch == 'K' && ch[2] == 'L'))
1106 /* Let para[0] point to the name of the sender */
1107 para[0] = cli_name(from);
1109 if (cli_from(from) != cptr)
1111 ServerStats->is_wrdi++;
1112 Debug((DEBUG_NOTICE, "Fake direction: Message (%s) coming from (%s)",
1113 buffer, cli_name(cptr)));
1122 ServerStats->is_empt++;
1123 Debug((DEBUG_NOTICE, "Empty message from host %s:%s",
1124 cli_name(cptr), cli_name(from)));
1129 * Extract the command code from the packet. Point s to the end
1130 * of the command code and calculate the length using pointer
1131 * arithmetic. Note: only need length for numerics and *all*
1132 * numerics must have parameters and thus a space after the command
1135 s = strchr(ch, ' '); /* s -> End of the command code */
1136 len = (s) ? (s - ch) : 0;
1137 if (len == 3 && IsDigit(*ch))
1139 numeric = (*ch - '0') * 100 + (*(ch + 1) - '0') * 10 + (*(ch + 2) - '0');
1140 paramcount = 2; /* destination, and the rest of it */
1141 ServerStats->is_num++;
1142 mptr = NULL; /* Init. to avoid stupid compiler warning :/ */
1149 /* Version Receive Send
1151 * 2.10.0 Tkn/Long Long
1152 * 2.10.10 Tkn/Long Tkn
1155 * Clients/unreg servers always receive/
1156 * send long commands -record
1158 * And for the record, this trie parser really does not care. - Dianora
1161 mptr = msg_tree_parse(ch, &tok_tree);
1165 mptr = msg_tree_parse(ch, &msg_tree);
1171 * Note: Give error message *only* to recognized
1172 * persons. It's a nightmare situation to have
1173 * two programs sending "Unknown command"'s or
1174 * equivalent to each other at full blast....
1175 * If it has got to person state, it at least
1176 * seems to be well behaving. Perhaps this message
1177 * should never be generated, though... --msa
1178 * Hm, when is the buffer empty -- if a command
1179 * code has been found ?? -Armin
1182 if (buffer[0] != '\0')
1184 Debug((DEBUG_ERROR, "Unknown (%s) from %s",
1185 ch, get_client_name(cptr, HIDE_IP)));
1188 ServerStats->is_unco++;
1192 paramcount = mptr->parameters;
1193 i = bufend - ((s) ? s : ch);
1197 * Must the following loop really be so devious? On
1198 * surface it splits the message to parameters from
1199 * blank spaces. But, if paramcount has been reached,
1200 * the rest of the message goes into this last parameter
1201 * (about same effect as ":" has...) --msa
1204 /* Note initially true: s==NULL || *(s-1) == '\0' !! */
1209 if (paramcount > MAXPARA)
1210 paramcount = MAXPARA;
1214 * Never "FRANCE " again!! ;-) Clean
1215 * out *all* blanks.. --msa
1225 * The rest is single parameter--can
1226 * include blanks also.
1229 para[++i] = s; /* preserve the colon to make do_numeric happy */
1235 if (i >= paramcount)
1237 for (; *s != ' ' && *s; s++);
1242 return (do_numeric(numeric, (*buffer != ':'), cptr, from, i, para));
1245 return (*mptr->handlers[cli_handler(cptr)]) (cptr, from, i, para);