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 }
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 }
629 /* This command is an alias for QUIT during the unregistered part of
630 * of the server. This is because someone jumping via a broken web
631 * proxy will send a 'POST' as their first command - which we will
632 * obviously disconnect them immediately for, stopping people abusing
638 0, MAXPARA, MFLG_SLOW, 0, NULL,
639 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
640 { m_quit, m_ignore, m_ignore, m_ignore, m_ignore }
645 /** Array of command parameters. */
646 static char *para[MAXPARA + 2]; /* leave room for prefix and null */
649 /** Add a message to the lookup trie.
650 * @param[in,out] mtree_p Trie node to insert under.
651 * @param[in] msg_p Message to insert.
652 * @param[in] cmd Text of command to insert.
655 add_msg_element(struct MessageTree *mtree_p, struct Message *msg_p, char *cmd)
657 struct MessageTree *ntree_p;
661 mtree_p->msg = msg_p;
665 if ((ntree_p = mtree_p->pointers[*cmd & (MAXPTRLEN-1)]) != NULL)
667 add_msg_element(ntree_p, msg_p, cmd+1);
671 ntree_p = (struct MessageTree *)MyCalloc(sizeof(struct MessageTree), 1);
672 mtree_p->pointers[*cmd & (MAXPTRLEN-1)] = ntree_p;
673 add_msg_element(ntree_p, msg_p, cmd+1);
677 /** Remove a message from the lookup trie.
678 * @param[in,out] mtree_p Trie node to remove command from.
679 * @param[in] cmd Text of command to remove.
682 del_msg_element(struct MessageTree *mtree_p, char *cmd)
684 int slot = *cmd & (MAXPTRLEN-1);
686 /* Either remove leaf message or from appropriate child. */
690 mtree_p->pointers[slot] = del_msg_element(mtree_p->pointers[slot], cmd + 1);
692 /* If current message or any child still exists, keep this node. */
695 for (slot = 0; slot < MAXPTRLEN; ++slot)
696 if (mtree_p->pointers[slot])
699 /* Otherwise, if we're not a root node, free it and return null. */
700 if (mtree_p != &msg_tree && mtree_p != &tok_tree)
705 /** Initialize the message lookup trie with all known commands. */
711 memset(&msg_tree, 0, sizeof(msg_tree));
712 memset(&tok_tree, 0, sizeof(tok_tree));
714 for (i = 0; msgtab[i].cmd != NULL ; i++)
716 add_msg_element(&msg_tree, &msgtab[i], msgtab[i].cmd);
717 add_msg_element(&tok_tree, &msgtab[i], msgtab[i].tok);
721 /** Look up a command in the message trie.
722 * @param cmd Text of command to look up.
723 * @param root Root of message trie.
724 * @return Pointer to matching message, or NULL if non exists.
726 static struct Message *
727 msg_tree_parse(char *cmd, struct MessageTree *root)
729 struct MessageTree *mtree;
731 for (mtree = root; mtree; mtree = mtree->pointers[(*cmd++) & (MAXPTRLEN-1)]) {
732 if (*cmd == '\0' && mtree->msg)
734 else if (!IsAlpha(*cmd))
740 /** Registers a service mapping to the pseudocommand handler.
741 * @param[in] map Service mapping to add.
742 * @return Non-zero on success; zero if a command already used the name.
744 int register_mapping(struct s_map *map)
748 if (msg_tree_parse(map->command, &msg_tree))
751 msg = (struct Message *)MyMalloc(sizeof(struct Message));
752 msg->cmd = map->command;
753 msg->tok = map->command;
756 msg->flags = MFLG_EXTRA;
757 if (!(map->flags & SMAP_FAST))
758 msg->flags |= MFLG_SLOW;
762 msg->handlers[UNREGISTERED_HANDLER] = m_ignore;
763 msg->handlers[CLIENT_HANDLER] = m_pseudo;
764 msg->handlers[SERVER_HANDLER] = m_ignore;
765 msg->handlers[OPER_HANDLER] = m_pseudo;
766 msg->handlers[SERVICE_HANDLER] = m_ignore;
768 add_msg_element(&msg_tree, msg, msg->cmd);
774 /** Removes a service mapping.
775 * @param[in] map Service mapping to remove.
776 * @return Non-zero on success; zero if no command used the name.
778 int unregister_mapping(struct s_map *map)
780 if (!msg_tree_parse(map->command, &msg_tree))
782 /* This simply should never happen. */
787 del_msg_element(&msg_tree, map->msg->cmd);
789 map->msg->extra = NULL;
796 /** Parse a line of data from a user.
797 * NOTE: parse_*() should not be called recursively by any other
799 * @param[in] cptr Client that sent the data.
800 * @param[in] buffer Start of input line.
801 * @param[in] bufend End of input line.
802 * @return 0 on success, -1 on parse error, or CPTR_KILLED if message
803 * handler returns it.
806 parse_client(struct Client *cptr, char *buffer, char *bufend)
808 struct Client* from = cptr;
814 struct Message* mptr;
815 MessageHandler handler = 0;
817 Debug((DEBUG_DEBUG, "Client Parsing: %s", buffer));
822 para[0] = cli_name(from);
823 for (ch = buffer; *ch == ' '; ch++); /* Eat leading spaces */
824 if (*ch == ':') /* Is any client doing this ? */
826 for (++ch; *ch && *ch != ' '; ++ch)
827 ; /* Ignore sender prefix from client */
829 ch++; /* Advance to command */
835 ServerStats->is_empt++;
836 Debug((DEBUG_NOTICE, "Empty message from host %s:%s",
837 cli_name(cptr), cli_name(from)));
841 if ((s = strchr(ch, ' ')))
844 if ((mptr = msg_tree_parse(ch, &msg_tree)) == NULL)
847 * Note: Give error message *only* to recognized
848 * persons. It's a nightmare situation to have
849 * two programs sending "Unknown command"'s or
850 * equivalent to each other at full blast....
851 * If it has got to person state, it at least
852 * seems to be well behaving. Perhaps this message
853 * should never be generated, though... --msa
854 * Hm, when is the buffer empty -- if a command
855 * code has been found ?? -Armin
857 if (buffer[0] != '\0')
860 send_reply(from, ERR_UNKNOWNCOMMAND, ch);
861 Debug((DEBUG_ERROR, "Unknown (%s) from %s",
862 ch, get_client_name(cptr, HIDE_IP)));
864 ServerStats->is_unco++;
868 paramcount = mptr->parameters;
869 i = bufend - ((s) ? s : ch);
871 if ((mptr->flags & MFLG_SLOW) || !IsAnOper(cptr))
872 cli_since(cptr) += (2 + i / 120);
874 * Allow only 1 msg per 2 seconds
875 * (on average) to prevent dumping.
876 * to keep the response rate up,
877 * bursts of up to 5 msgs are allowed
882 * Must the following loop really be so devious? On
883 * surface it splits the message to parameters from
884 * blank spaces. But, if paramcount has been reached,
885 * the rest of the message goes into this last parameter
886 * (about same effect as ":" has...) --msa
889 /* Note initially true: s==NULL || *(s-1) == '\0' !! */
891 if (mptr->flags & MFLG_EXTRA) {
892 /* This is a horrid kludge to avoid changing the command handler
894 para[1] = (char*)mptr->extra;
901 if (paramcount > MAXPARA)
902 paramcount = MAXPARA;
906 * Never "FRANCE " again!! ;-) Clean
907 * out *all* blanks.. --msa
917 * The rest is single parameter--can
918 * include blanks also.
926 for (; *s != ' ' && *s; s++);
932 handler = mptr->handlers[cli_handler(cptr)];
933 assert(0 != handler);
935 if (!feature_bool(FEAT_IDLE_FROM_MSG) && IsUser(cptr) &&
936 handler != m_ping && handler != m_ignore)
937 cli_user(from)->last = CurrentTime;
939 return (*handler) (cptr, from, i, para);
942 /** Parse a line of data from a server.
943 * @param[in] cptr Client that sent the data.
944 * @param[in] buffer Start of input line.
945 * @param[in] bufend End of input line.
946 * @return 0 on success, -1 on parse error, or CPTR_KILLED if message
947 * handler returns it.
949 int parse_server(struct Client *cptr, char *buffer, char *bufend)
951 struct Client* from = cptr;
958 struct Message* mptr;
960 Debug((DEBUG_DEBUG, "Server Parsing: %s", buffer));
965 para[0] = cli_name(from);
968 * A server ALWAYS sends a prefix. When it starts with a ':' it's the
969 * protocol 9 prefix: a nick or a server name. Otherwise it's a numeric
974 /* Let para[0] point to the name of the sender */
976 if (!(ch = strchr(ch, ' ')))
980 /* And let `from' point to its client structure,
981 opps.. a server is _also_ a client --Nem */
982 from = FindClient(para[0]);
985 * If the client corresponding to the
986 * prefix is not found. We must ignore it,
987 * it is simply a lagged message traveling
988 * upstream a SQUIT that removed the client
993 Debug((DEBUG_NOTICE, "Unknown prefix (%s)(%s) from (%s)",
994 para[0], buffer, cli_name(cptr)));
995 ++ServerStats->is_unpf;
999 * However, the only thing that MUST be
1000 * allowed to travel upstream against an
1001 * squit, is an SQUIT itself (the timestamp
1002 * protects us from being used wrong)
1006 para[0] = cli_name(cptr);
1012 else if (cli_from(from) != cptr)
1014 ++ServerStats->is_wrdi;
1015 Debug((DEBUG_NOTICE, "Fake direction: Message (%s) coming from (%s)",
1016 buffer, cli_name(cptr)));
1022 char numeric_prefix[6];
1024 for (i = 0; i < 5; ++i)
1026 if ('\0' == ch[i] || ' ' == (numeric_prefix[i] = ch[i]))
1031 numeric_prefix[i] = '\0';
1034 * We got a numeric nick as prefix
1035 * 1 or 2 character prefixes are from servers
1036 * 3 or 5 chars are from clients
1040 protocol_violation(cptr,"Missing Prefix");
1043 else if (' ' == ch[1] || ' ' == ch[2])
1044 from = FindNServer(numeric_prefix);
1046 from = findNUser(numeric_prefix);
1052 while (*ch != ' ' && *ch);
1055 * If the client corresponding to the
1056 * prefix is not found. We must ignore it,
1057 * it is simply a lagged message traveling
1058 * upstream a SQUIT that removed the client
1060 * There turned out to be other reasons that
1061 * a prefix is unknown, needing an upstream
1062 * KILL. Also, next to an SQUIT we better
1063 * allow a KILL to pass too.
1068 ServerStats->is_unpf++;
1071 if (*ch == 'N' && (ch[1] == ' ' || ch[1] == 'I'))
1072 /* Only sent a KILL for a nick change */
1074 struct Client *server;
1075 /* Kill the unknown numeric prefix upstream if
1076 * it's server still exists: */
1077 if ((server = FindNServer(numeric_prefix)) && cli_from(server) == cptr)
1078 sendcmdto_one(&me, CMD_KILL, cptr, "%s :%s (Unknown numeric nick)",
1079 numeric_prefix, cli_name(&me));
1082 * Things that must be allowed to travel
1083 * upstream against an squit:
1085 if (ch[1] == 'Q' || (*ch == 'D' && ch[1] == ' ') ||
1086 (*ch == 'K' && ch[2] == 'L'))
1092 /* Let para[0] point to the name of the sender */
1093 para[0] = cli_name(from);
1095 if (cli_from(from) != cptr)
1097 ServerStats->is_wrdi++;
1098 Debug((DEBUG_NOTICE, "Fake direction: Message (%s) coming from (%s)",
1099 buffer, cli_name(cptr)));
1108 ServerStats->is_empt++;
1109 Debug((DEBUG_NOTICE, "Empty message from host %s:%s",
1110 cli_name(cptr), cli_name(from)));
1115 * Extract the command code from the packet. Point s to the end
1116 * of the command code and calculate the length using pointer
1117 * arithmetic. Note: only need length for numerics and *all*
1118 * numerics must have parameters and thus a space after the command
1121 s = strchr(ch, ' '); /* s -> End of the command code */
1122 len = (s) ? (s - ch) : 0;
1123 if (len == 3 && IsDigit(*ch))
1125 numeric = (*ch - '0') * 100 + (*(ch + 1) - '0') * 10 + (*(ch + 2) - '0');
1126 paramcount = 2; /* destination, and the rest of it */
1127 ServerStats->is_num++;
1128 mptr = NULL; /* Init. to avoid stupid compiler warning :/ */
1135 /* Version Receive Send
1137 * 2.10.0 Tkn/Long Long
1138 * 2.10.10 Tkn/Long Tkn
1141 * Clients/unreg servers always receive/
1142 * send long commands -record
1144 * And for the record, this trie parser really does not care. - Dianora
1147 mptr = msg_tree_parse(ch, &tok_tree);
1151 mptr = msg_tree_parse(ch, &msg_tree);
1157 * Note: Give error message *only* to recognized
1158 * persons. It's a nightmare situation to have
1159 * two programs sending "Unknown command"'s or
1160 * equivalent to each other at full blast....
1161 * If it has got to person state, it at least
1162 * seems to be well behaving. Perhaps this message
1163 * should never be generated, though... --msa
1164 * Hm, when is the buffer empty -- if a command
1165 * code has been found ?? -Armin
1168 if (buffer[0] != '\0')
1170 Debug((DEBUG_ERROR, "Unknown (%s) from %s",
1171 ch, get_client_name(cptr, HIDE_IP)));
1174 ServerStats->is_unco++;
1178 paramcount = mptr->parameters;
1179 i = bufend - ((s) ? s : ch);
1183 * Must the following loop really be so devious? On
1184 * surface it splits the message to parameters from
1185 * blank spaces. But, if paramcount has been reached,
1186 * the rest of the message goes into this last parameter
1187 * (about same effect as ":" has...) --msa
1190 /* Note initially true: s==NULL || *(s-1) == '\0' !! */
1195 if (paramcount > MAXPARA)
1196 paramcount = MAXPARA;
1200 * Never "FRANCE " again!! ;-) Clean
1201 * out *all* blanks.. --msa
1211 * The rest is single parameter--can
1212 * include blanks also.
1215 para[++i] = s; /* preserve the colon to make do_numeric happy */
1221 if (i >= paramcount)
1223 for (; *s != ' ' && *s; s++);
1228 return (do_numeric(numeric, (*buffer != ':'), cptr, from, i, para));
1231 return (*mptr->handlers[cli_handler(cptr)]) (cptr, from, i, para);