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;
106 /** Array of all supported commands. */
107 struct Message msgtab[] = {
111 0, MAXPARA, MFLG_SLOW, 0, NULL,
112 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
113 { m_unregistered, m_privmsg, ms_privmsg, mo_privmsg, m_ignore }
118 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0, NULL,
119 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
120 { m_nick, m_nick, ms_nick, m_nick, m_ignore }
125 0, MAXPARA, MFLG_SLOW | MFLG_IGNORE, 0, NULL,
126 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
127 { m_ignore, m_notice, ms_notice, mo_notice, m_ignore }
132 0, MAXPARA, MFLG_SLOW, 0, NULL,
133 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
134 { m_unregistered, m_wallchops, ms_wallchops, m_wallchops, m_ignore }
139 0, MAXPARA, MFLG_SLOW, 0, NULL,
140 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
141 { m_unregistered, m_wallvoices, ms_wallvoices, m_wallvoices, m_ignore }
146 0, MAXPARA, MFLG_SLOW, 0, NULL,
147 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
148 { m_unregistered, m_cprivmsg, m_ignore, m_cprivmsg, m_ignore }
153 0, MAXPARA, MFLG_SLOW, 0, NULL,
154 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
155 { m_unregistered, m_cnotice, m_ignore, m_cnotice, m_ignore }
160 0, MAXPARA, MFLG_SLOW, 0, NULL,
161 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
162 { m_unregistered, m_join, ms_join, m_join, m_ignore }
167 0, MAXPARA, MFLG_SLOW, 0, NULL,
168 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
169 { m_unregistered, m_mode, ms_mode, m_mode, m_ignore }
174 0, MAXPARA, MFLG_SLOW, 0, NULL,
175 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
176 { m_ignore, m_ignore, ms_burst, m_ignore, m_ignore }
181 0, MAXPARA, MFLG_SLOW, 0, NULL,
182 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
183 { m_ignore, m_ignore, ms_create, m_ignore, m_ignore }
188 0, MAXPARA, MFLG_SLOW, 0, NULL,
189 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
190 { m_ignore, m_ignore, ms_destruct, m_ignore, m_ignore }
195 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0, NULL,
196 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
197 { m_quit, m_quit, ms_quit, m_quit, m_ignore }
202 0, MAXPARA, MFLG_SLOW, 0, NULL,
203 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
204 { m_unregistered, m_part, ms_part, m_part, m_ignore }
209 0, MAXPARA, MFLG_SLOW, 0, NULL,
210 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
211 { m_unregistered, m_topic, ms_topic, m_topic, m_ignore }
216 0, MAXPARA, MFLG_SLOW, 0, NULL,
217 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
218 { m_unregistered, m_invite, ms_invite, m_invite, m_ignore }
223 0, MAXPARA, MFLG_SLOW, 0, NULL,
224 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
225 { m_unregistered, m_kick, ms_kick, m_kick, m_ignore }
230 0, MAXPARA, MFLG_SLOW, 0, NULL,
231 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
232 { m_unregistered, m_not_oper, ms_wallops, mo_wallops, m_ignore }
237 0, MAXPARA, MFLG_SLOW, 0, NULL,
238 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
239 { m_unregistered, m_not_oper, ms_wallusers, mo_wallusers, m_ignore }
244 0, MAXPARA, MFLG_SLOW, 0, NULL,
245 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
246 { m_ignore, m_ignore, ms_desynch, m_ignore, m_ignore }
251 0, MAXPARA, MFLG_SLOW, 0, NULL,
252 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
253 { m_unregistered, m_ping, ms_ping, mo_ping, m_ignore }
258 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0, NULL,
259 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
260 { mr_pong, m_pong, ms_pong, m_pong, m_ignore }
265 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0, NULL,
266 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
267 { mr_error, m_ignore, ms_error, m_ignore, m_ignore }
272 0, MAXPARA, MFLG_SLOW, 0, NULL,
273 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
274 { m_unregistered, m_not_oper, ms_kill, mo_kill, m_ignore }
279 0, MAXPARA, MFLG_SLOW, 0, NULL,
280 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
281 { m_user, m_registered, m_ignore, m_registered, m_ignore }
286 0, MAXPARA, MFLG_SLOW, 0, NULL,
287 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
288 { m_unregistered, m_away, ms_away, m_away, m_ignore }
293 0, 1, MFLG_SLOW, 0, NULL,
294 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
295 { m_unregistered, m_ison, m_ignore, m_ison, m_ignore }
300 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0, NULL,
301 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
302 { mr_server, m_registered, ms_server, m_registered, m_ignore }
307 0, MAXPARA, MFLG_SLOW, 0, NULL,
308 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
309 { m_unregistered, m_not_oper, ms_squit, mo_squit, m_ignore }
314 0, MAXPARA, MFLG_SLOW, 0, NULL,
315 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
316 { m_unregistered, m_whois, ms_whois, m_whois, m_ignore }
321 0, MAXPARA, MFLG_SLOW, 0, NULL,
322 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
323 { m_unregistered, m_who, m_ignore, m_who, m_ignore }
328 0, MAXPARA, MFLG_SLOW, 0, NULL,
329 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
330 { m_unregistered, m_whowas, m_whowas, m_whowas, m_ignore }
335 0, MAXPARA, MFLG_SLOW, 0, NULL,
336 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
337 { m_unregistered, m_list, m_ignore, m_list, m_ignore }
342 0, MAXPARA, MFLG_SLOW, 0, NULL,
343 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
344 { m_unregistered, m_names, ms_names, m_names, m_ignore }
349 0, 1, MFLG_SLOW, 0, NULL,
350 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
351 { m_unregistered, m_userhost, m_ignore, m_userhost, m_ignore }
356 0, 1, MFLG_SLOW, 0, NULL,
357 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
358 { m_unregistered, m_userip, m_ignore, m_userip, m_ignore }
363 0, MAXPARA, MFLG_SLOW, 0, NULL,
364 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
365 { m_unregistered, m_trace, ms_trace, mo_trace, m_ignore }
370 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0, NULL,
371 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
372 { mr_pass, m_registered, m_ignore, m_registered, m_ignore }
377 0, MAXPARA, MFLG_SLOW, 0, NULL,
378 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
379 { m_unregistered, m_lusers, ms_lusers, m_lusers, m_ignore }
384 0, MAXPARA, MFLG_SLOW, 0, NULL,
385 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
386 { m_unregistered, m_time, m_time, m_time, m_ignore }
391 0, MAXPARA, MFLG_SLOW, 0, NULL,
392 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
393 { m_unregistered, m_ignore, ms_settime, mo_settime, m_ignore }
398 0, MAXPARA, MFLG_SLOW, 0, NULL,
399 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
400 { m_unregistered, m_not_oper, ms_rping, mo_rping, m_ignore }
405 0, MAXPARA, MFLG_SLOW, 0, NULL,
406 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
407 { m_unregistered, m_ignore, ms_rpong, m_ignore, m_ignore }
412 0, MAXPARA, MFLG_SLOW, 0, NULL,
413 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
414 { m_unregistered, m_oper, ms_oper, mo_oper, m_ignore }
419 0, MAXPARA, MFLG_SLOW, 0, NULL,
420 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
421 { m_unregistered, m_not_oper, ms_connect, mo_connect, m_ignore }
426 0, MAXPARA, MFLG_SLOW, 0, NULL,
427 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
428 { m_unregistered, m_map, m_ignore, m_map, m_ignore }
433 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0, NULL,
434 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
435 { m_version, m_version, ms_version, mo_version, m_ignore }
440 0, MAXPARA, MFLG_SLOW, 0, NULL,
441 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
442 { m_unregistered, m_stats, m_stats, m_stats, m_ignore }
447 0, MAXPARA, MFLG_SLOW, 0, NULL,
448 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
449 { m_unregistered, m_links, ms_links, m_links, m_ignore }
454 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0, NULL,
455 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
456 { m_admin, m_admin, ms_admin, mo_admin, m_ignore }
461 0, MAXPARA, MFLG_SLOW, 0, NULL,
462 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
463 { m_unregistered, m_help, m_ignore, m_help, m_ignore }
468 0, MAXPARA, MFLG_SLOW, 0, NULL,
469 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
470 { m_unregistered, m_info, ms_info, mo_info, m_ignore }
475 0, MAXPARA, MFLG_SLOW, 0, NULL,
476 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
477 { m_unregistered, m_motd, m_motd, m_motd, m_ignore }
482 0, MAXPARA, MFLG_SLOW, 0, NULL,
483 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
484 { m_unregistered, m_not_oper, m_ignore, mo_close, m_ignore }
489 0, MAXPARA, MFLG_SLOW, 0, NULL,
490 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
491 { m_unregistered, m_silence, ms_silence, m_silence, m_ignore }
496 0, MAXPARA, 0, 0, NULL,
497 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
498 { m_unregistered, m_gline, ms_gline, mo_gline, m_ignore }
503 0, MAXPARA, MFLG_SLOW, 0, NULL,
504 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
505 { m_unregistered, m_not_oper, ms_jupe, mo_jupe, m_ignore }
510 0, MAXPARA, MFLG_SLOW, 0, NULL,
511 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
512 { m_unregistered, m_not_oper, ms_opmode, mo_opmode, m_ignore }
517 0, MAXPARA, MFLG_SLOW, 0, NULL,
518 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
519 { m_unregistered, m_not_oper, ms_clearmode, mo_clearmode, m_ignore }
524 0, MAXPARA, MFLG_SLOW, 0, NULL,
525 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
526 { m_unregistered, m_not_oper, ms_uping, mo_uping, m_ignore }
531 0, MAXPARA, MFLG_SLOW, 0, NULL,
532 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
533 { m_ignore, m_ignore, ms_end_of_burst, m_ignore, m_ignore }
536 MSG_END_OF_BURST_ACK,
537 TOK_END_OF_BURST_ACK,
538 0, MAXPARA, MFLG_SLOW, 0, NULL,
539 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
540 { m_ignore, m_ignore, ms_end_of_burst_ack, m_ignore, m_ignore }
545 0, MAXPARA, MFLG_SLOW, 0, NULL,
546 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
547 { m_unregistered, m_hash, m_hash, m_hash, m_ignore }
552 0, MAXPARA, MFLG_SLOW, 0, NULL,
553 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
554 { m_unregistered, m_not_oper, m_ignore, mo_rehash, m_ignore }
559 0, MAXPARA, MFLG_SLOW, 0, NULL,
560 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
561 { m_unregistered, m_not_oper, m_ignore, mo_restart, m_ignore }
566 0, MAXPARA, MFLG_SLOW, 0, NULL,
567 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
568 { m_unregistered, m_not_oper, m_ignore, mo_die, m_ignore }
573 0, MAXPARA, MFLG_SLOW, 0, NULL,
574 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
575 { m_proto, m_proto, m_proto, m_proto, m_ignore }
580 0, MAXPARA, MFLG_SLOW, 0, NULL,
581 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
582 { m_unregistered, m_not_oper, m_ignore, mo_set, m_ignore }
587 0, MAXPARA, MFLG_SLOW, 0, NULL,
588 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
589 { m_unregistered, m_not_oper, m_ignore, mo_reset, m_ignore }
594 0, MAXPARA, MFLG_SLOW, 0, NULL,
595 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
596 { m_unregistered, m_not_oper, m_ignore, mo_get, m_ignore }
601 0, MAXPARA, MFLG_SLOW, 0, NULL,
602 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
603 { m_unregistered, m_not_oper, m_ignore, mo_privs, m_ignore }
608 0, MAXPARA, MFLG_SLOW, 0, NULL,
609 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
610 { m_ignore, m_ignore, ms_account, m_ignore, m_ignore }
615 0, MAXPARA, MFLG_SLOW, 0, NULL,
616 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
617 { m_ignore, m_not_oper, ms_asll, mo_asll, m_ignore }
619 /* This command is an alias for QUIT during the unregistered part of
620 * of the server. This is because someone jumping via a broken web
621 * proxy will send a 'POST' as their first command - which we will
622 * obviously disconnect them immediately for, stopping people abusing
628 0, MAXPARA, MFLG_SLOW, 0, NULL,
629 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
630 { m_quit, m_ignore, m_ignore, m_ignore, m_ignore }
635 /** Array of command parameters. */
636 static char *para[MAXPARA + 2]; /* leave room for prefix and null */
639 /** Add a message to the lookup trie.
640 * @param[in,out] mtree_p Trie node to insert under.
641 * @param[in] msg_p Message to insert.
642 * @param[in] cmd Text of command to insert.
645 add_msg_element(struct MessageTree *mtree_p, struct Message *msg_p, char *cmd)
647 struct MessageTree *ntree_p;
651 mtree_p->msg = msg_p;
655 if ((ntree_p = mtree_p->pointers[*cmd & (MAXPTRLEN-1)]) != NULL)
657 add_msg_element(ntree_p, msg_p, cmd+1);
661 ntree_p = (struct MessageTree *)MyCalloc(sizeof(struct MessageTree), 1);
662 mtree_p->pointers[*cmd & (MAXPTRLEN-1)] = ntree_p;
663 add_msg_element(ntree_p, msg_p, cmd+1);
667 /** Remove a message from the lookup trie.
668 * @param[in,out] mtree_p Trie node to remove command from.
669 * @param[in] cmd Text of command to remove.
672 del_msg_element(struct MessageTree *mtree_p, char *cmd)
674 struct MessageTree *ntree_p;
679 if ((ntree_p = mtree_p->pointers[*cmd & (MAXPTRLEN-1)]) != NULL)
681 del_msg_element(ntree_p, cmd+1);
683 mtree_p->pointers[*cmd & (MAXPTRLEN-1)] = NULL;
687 /** Initialize the message lookup trie with all known commands. */
693 memset(&msg_tree, 0, sizeof(msg_tree));
695 for (i = 0; msgtab[i].cmd != NULL ; i++)
697 add_msg_element(&msg_tree, &msgtab[i], msgtab[i].cmd);
698 add_msg_element(&msg_tree, &msgtab[i], msgtab[i].tok);
702 /** Look up a command in the message trie.
703 * @param cmd Text of command to look up.
704 * @param root Root of message trie.
705 * @return Pointer to matching message, or NULL if non exists.
707 static struct Message *
708 msg_tree_parse(char *cmd, struct MessageTree *root)
710 struct MessageTree *mtree;
712 for (mtree = root; mtree; mtree = mtree->pointers[(*cmd++) & (MAXPTRLEN-1)]) {
713 if (*cmd == '\0' && mtree->msg)
715 else if (!IsAlpha(*cmd))
721 /** Registers a service mapping to the pseudocommand handler.
722 * @param[in] map Service mapping to add.
723 * @return Non-zero on success; zero if a command already used the name.
725 int register_mapping(struct s_map *map)
729 if (msg_tree_parse(map->command, &msg_tree))
732 msg = (struct Message *)MyMalloc(sizeof(struct Message));
733 msg->cmd = map->command;
734 msg->tok = map->command;
737 msg->flags = MFLG_SLOW | MFLG_EXTRA;
741 msg->handlers[UNREGISTERED_HANDLER] = m_ignore;
742 msg->handlers[CLIENT_HANDLER] = m_pseudo;
743 msg->handlers[SERVER_HANDLER] = m_ignore;
744 msg->handlers[OPER_HANDLER] = m_pseudo;
745 msg->handlers[SERVICE_HANDLER] = m_ignore;
747 /* Service mappings are only applicable to clients; insert the
748 pseudocommand into the command tree only. */
749 add_msg_element(&msg_tree, msg, msg->cmd);
755 /** Removes a service mapping.
756 * @param[in] map Service mapping to remove.
757 * @return Non-zero on success; zero if no command used the name.
759 int unregister_mapping(struct s_map *map)
761 if (!msg_tree_parse(map->command, &msg_tree))
763 /* This simply should never happen. */
768 del_msg_element(&msg_tree, map->msg->cmd);
770 map->msg->extra = NULL;
777 /** Parse a line of data from a user.
778 * NOTE: parse_*() should not be called recusively by any other functions!
779 * @param[in] cptr Client that sent the data.
780 * @param[in] buffer Start of input line.
781 * @param[in] bufend End of input line.
782 * @return 0 on success, -1 on parse error, or CPTR_KILLED if message
783 * handler returns it.
786 parse_client(struct Client *cptr, char *buffer, char *bufend)
788 struct Client* from = cptr;
794 struct Message* mptr;
795 MessageHandler handler = 0;
797 Debug((DEBUG_DEBUG, "Client Parsing: %s", buffer));
802 para[0] = cli_name(from);
803 for (ch = buffer; *ch == ' '; ch++); /* Eat leading spaces */
804 if (*ch == ':') /* Is any client doing this ? */
806 for (++ch; *ch && *ch != ' '; ++ch)
807 ; /* Ignore sender prefix from client */
809 ch++; /* Advance to command */
815 ServerStats->is_empt++;
816 Debug((DEBUG_NOTICE, "Empty message from host %s:%s",
817 cli_name(cptr), cli_name(from)));
821 if ((s = strchr(ch, ' ')))
824 if ((mptr = msg_tree_parse(ch, &msg_tree)) == NULL)
827 * Note: Give error message *only* to recognized
828 * persons. It's a nightmare situation to have
829 * two programs sending "Unknown command"'s or
830 * equivalent to each other at full blast....
831 * If it has got to person state, it at least
832 * seems to be well behaving. Perhaps this message
833 * should never be generated, though... --msa
834 * Hm, when is the buffer empty -- if a command
835 * code has been found ?? -Armin
837 if (buffer[0] != '\0')
840 send_reply(from, ERR_UNKNOWNCOMMAND, ch);
841 Debug((DEBUG_ERROR, "Unknown (%s) from %s",
842 ch, get_client_name(cptr, HIDE_IP)));
844 ServerStats->is_unco++;
848 paramcount = mptr->parameters;
849 i = bufend - ((s) ? s : ch);
851 if ((mptr->flags & MFLG_SLOW))
852 cli_since(cptr) += (2 + i / 120);
854 * Allow only 1 msg per 2 seconds
855 * (on average) to prevent dumping.
856 * to keep the response rate up,
857 * bursts of up to 5 msgs are allowed
862 * Must the following loop really be so devious? On
863 * surface it splits the message to parameters from
864 * blank spaces. But, if paramcount has been reached,
865 * the rest of the message goes into this last parameter
866 * (about same effect as ":" has...) --msa
869 /* Note initially true: s==NULL || *(s-1) == '\0' !! */
871 if (mptr->flags & MFLG_EXTRA) {
872 /* This is a horrid kludge to avoid changing the command handler
874 para[1] = (char*)mptr->extra;
881 if (paramcount > MAXPARA)
882 paramcount = MAXPARA;
886 * Never "FRANCE " again!! ;-) Clean
887 * out *all* blanks.. --msa
897 * The rest is single parameter--can
898 * include blanks also.
906 for (; *s != ' ' && *s; s++);
912 handler = mptr->handlers[cli_handler(cptr)];
913 assert(0 != handler);
915 if (!feature_bool(FEAT_IDLE_FROM_MSG) && IsUser(cptr) &&
916 handler != m_ping && handler != m_ignore)
917 cli_user(from)->last = CurrentTime;
919 return (*handler) (cptr, from, i, para);
922 /** Parse a line of data from a server.
923 * @param[in] cptr Client that sent the data.
924 * @param[in] buffer Start of input line.
925 * @param[in] bufend End of input line.
926 * @return 0 on success, -1 on parse error, or CPTR_KILLED if message
927 * handler returns it.
929 int parse_server(struct Client *cptr, char *buffer, char *bufend)
931 struct Client* from = cptr;
938 struct Message* mptr;
940 Debug((DEBUG_DEBUG, "Server Parsing: %s", buffer));
945 para[0] = cli_name(from);
948 * A server ALWAYS sends a prefix. When it starts with a ':' it's the
949 * protocol 9 prefix: a nick or a server name. Otherwise it's a numeric
954 /* Let para[0] point to the name of the sender */
956 if (!(ch = strchr(ch, ' ')))
960 /* And let `from' point to its client structure,
961 opps.. a server is _also_ a client --Nem */
962 from = FindClient(para[0]);
965 * If the client corresponding to the
966 * prefix is not found. We must ignore it,
967 * it is simply a lagged message travelling
968 * upstream a SQUIT that removed the client
973 Debug((DEBUG_NOTICE, "Unknown prefix (%s)(%s) from (%s)",
974 para[0], buffer, cli_name(cptr)));
975 ++ServerStats->is_unpf;
979 * However, the only thing that MUST be
980 * allowed to travel upstream against an
981 * squit, is an SQUIT itself (the timestamp
982 * protects us from being used wrong)
986 para[0] = cli_name(cptr);
992 else if (cli_from(from) != cptr)
994 ++ServerStats->is_wrdi;
995 Debug((DEBUG_NOTICE, "Fake direction: Message (%s) coming from (%s)",
996 buffer, cli_name(cptr)));
1002 char numeric_prefix[6];
1004 for (i = 0; i < 5; ++i)
1006 if ('\0' == ch[i] || ' ' == (numeric_prefix[i] = ch[i]))
1011 numeric_prefix[i] = '\0';
1014 * We got a numeric nick as prefix
1015 * 1 or 2 character prefixes are from servers
1016 * 3 or 5 chars are from clients
1020 protocol_violation(cptr,"Missing Prefix");
1023 else if (' ' == ch[1] || ' ' == ch[2])
1024 from = FindNServer(numeric_prefix);
1026 from = findNUser(numeric_prefix);
1032 while (*ch != ' ' && *ch);
1035 * If the client corresponding to the
1036 * prefix is not found. We must ignore it,
1037 * it is simply a lagged message travelling
1038 * upstream a SQUIT that removed the client
1040 * There turned out to be other reasons that
1041 * a prefix is unknown, needing an upstream
1042 * KILL. Also, next to an SQUIT we better
1043 * allow a KILL to pass too.
1048 ServerStats->is_unpf++;
1051 if (*ch == 'N' && (ch[1] == ' ' || ch[1] == 'I'))
1052 /* Only sent a KILL for a nick change */
1054 struct Client *server;
1055 /* Kill the unknown numeric prefix upstream if
1056 * it's server still exists: */
1057 if ((server = FindNServer(numeric_prefix)) && cli_from(server) == cptr)
1058 sendcmdto_one(&me, CMD_KILL, cptr, "%s :%s (Unknown numeric nick)",
1059 numeric_prefix, cli_name(&me));
1062 * Things that must be allowed to travel
1063 * upstream against an squit:
1065 if (ch[1] == 'Q' || (*ch == 'D' && ch[1] == ' ') ||
1066 (*ch == 'K' && ch[2] == 'L'))
1072 /* Let para[0] point to the name of the sender */
1073 para[0] = cli_name(from);
1075 if (cli_from(from) != cptr)
1077 ServerStats->is_wrdi++;
1078 Debug((DEBUG_NOTICE, "Fake direction: Message (%s) coming from (%s)",
1079 buffer, cli_name(cptr)));
1088 ServerStats->is_empt++;
1089 Debug((DEBUG_NOTICE, "Empty message from host %s:%s",
1090 cli_name(cptr), cli_name(from)));
1095 * Extract the command code from the packet. Point s to the end
1096 * of the command code and calculate the length using pointer
1097 * arithmetic. Note: only need length for numerics and *all*
1098 * numerics must have parameters and thus a space after the command
1101 s = strchr(ch, ' '); /* s -> End of the command code */
1102 len = (s) ? (s - ch) : 0;
1103 if (len == 3 && IsDigit(*ch))
1105 numeric = (*ch - '0') * 100 + (*(ch + 1) - '0') * 10 + (*(ch + 2) - '0');
1106 paramcount = 2; /* destination, and the rest of it */
1107 ServerStats->is_num++;
1108 mptr = NULL; /* Init. to avoid stupid compiler warning :/ */
1115 /* Version Receive Send
1117 * 2.10.0 Tkn/Long Long
1118 * 2.10.10 Tkn/Long Tkn
1121 * Clients/unreg servers always receive/
1122 * send long commands -record
1124 * And for the record, this trie parser really does not care. - Dianora
1127 mptr = msg_tree_parse(ch, &msg_tree);
1132 * Note: Give error message *only* to recognized
1133 * persons. It's a nightmare situation to have
1134 * two programs sending "Unknown command"'s or
1135 * equivalent to each other at full blast....
1136 * If it has got to person state, it at least
1137 * seems to be well behaving. Perhaps this message
1138 * should never be generated, though... --msa
1139 * Hm, when is the buffer empty -- if a command
1140 * code has been found ?? -Armin
1143 if (buffer[0] != '\0')
1145 Debug((DEBUG_ERROR, "Unknown (%s) from %s",
1146 ch, get_client_name(cptr, HIDE_IP)));
1149 ServerStats->is_unco++;
1153 paramcount = mptr->parameters;
1154 i = bufend - ((s) ? s : ch);
1158 * Must the following loop really be so devious? On
1159 * surface it splits the message to parameters from
1160 * blank spaces. But, if paramcount has been reached,
1161 * the rest of the message goes into this last parameter
1162 * (about same effect as ":" has...) --msa
1165 /* Note initially true: s==NULL || *(s-1) == '\0' !! */
1170 if (paramcount > MAXPARA)
1171 paramcount = MAXPARA;
1175 * Never "FRANCE " again!! ;-) Clean
1176 * out *all* blanks.. --msa
1186 * The rest is single parameter--can
1187 * include blanks also.
1190 para[++i] = s; /* preserve the colon to make do_numeric happy */
1196 if (i >= paramcount)
1198 for (; *s != ' ' && *s; s++);
1203 return (do_numeric(numeric, (*buffer != ':'), cptr, from, i, para));
1206 return (*mptr->handlers[cli_handler(cptr)]) (cptr, from, i, para);