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.
28 #include "ircd_alloc.h"
29 #include "ircd_chattr.h"
30 #include "ircd_string.h"
36 #include "querycmds.h"
42 #include "s_numeric.h"
59 struct MessageTree *pointers[26];
63 struct Message msgtab[] = {
67 0, MAXPARA, MFLG_SLOW, 0,
68 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
69 { m_unregistered, m_privmsg, ms_privmsg, mo_privmsg, m_ignore }
74 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0,
75 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
76 { m_nick, m_nick, ms_nick, m_nick, m_ignore }
81 0, MAXPARA, MFLG_SLOW | MFLG_IGNORE, 0,
82 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
83 { m_ignore, m_notice, ms_notice, mo_notice, m_ignore }
88 0, MAXPARA, MFLG_SLOW, 0,
89 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
90 { m_unregistered, m_wallchops, ms_wallchops, m_wallchops, m_ignore }
95 0, MAXPARA, MFLG_SLOW, 0,
96 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
97 { m_unregistered, m_cprivmsg, m_ignore, m_cprivmsg, m_ignore }
102 0, MAXPARA, MFLG_SLOW, 0,
103 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
104 { m_unregistered, m_cnotice, m_ignore, m_cnotice, m_ignore }
109 0, MAXPARA, MFLG_SLOW, 0,
110 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
111 { m_unregistered, m_join, ms_join, m_join, m_ignore }
116 0, MAXPARA, MFLG_SLOW, 0,
117 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
118 { m_unregistered, m_mode, ms_mode, m_mode, m_ignore }
123 0, MAXPARA, MFLG_SLOW, 0,
124 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
125 { m_ignore, m_ignore, ms_burst, m_ignore, m_ignore }
130 0, MAXPARA, MFLG_SLOW, 0,
131 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
132 { m_ignore, m_ignore, ms_create, m_ignore, m_ignore }
137 0, MAXPARA, MFLG_SLOW, 0,
138 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
139 { m_ignore, m_ignore, ms_destruct, m_ignore, m_ignore }
144 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0,
145 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
146 { m_quit, m_quit, ms_quit, m_quit, m_ignore }
151 0, MAXPARA, MFLG_SLOW, 0,
152 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
153 { m_unregistered, m_part, ms_part, m_part, m_ignore }
158 0, MAXPARA, MFLG_SLOW, 0,
159 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
160 { m_unregistered, m_topic, ms_topic, m_topic, m_ignore }
165 0, MAXPARA, MFLG_SLOW, 0,
166 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
167 { m_unregistered, m_invite, ms_invite, m_invite, m_ignore }
172 0, MAXPARA, MFLG_SLOW, 0,
173 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
174 { m_unregistered, m_kick, ms_kick, m_kick, m_ignore }
179 0, MAXPARA, MFLG_SLOW, 0,
180 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
181 { m_unregistered, m_not_oper, ms_wallops, mo_wallops, m_ignore }
186 0, MAXPARA, MFLG_SLOW, 0,
187 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
188 { m_ignore, m_ignore, ms_desynch, m_ignore, m_ignore }
193 0, MAXPARA, MFLG_SLOW, 0,
194 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
195 { m_unregistered, m_ping, ms_ping, m_ping, m_ignore }
200 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0,
201 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
202 { mr_pong, m_ignore, ms_pong, m_ignore, m_ignore }
207 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0,
208 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
209 { mr_error, m_ignore, ms_error, m_ignore, m_ignore }
214 0, MAXPARA, MFLG_SLOW, 0,
215 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
216 { m_unregistered, m_not_oper, ms_kill, mo_kill, m_ignore }
221 0, MAXPARA, MFLG_SLOW, 0,
222 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
223 { m_user, m_registered, m_ignore, m_registered, m_ignore }
228 0, MAXPARA, MFLG_SLOW, 0,
229 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
230 { m_unregistered, m_away, ms_away, m_away, m_ignore }
236 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
237 { m_unregistered, m_ison, m_ignore, m_ison, m_ignore }
242 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0,
243 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
244 { mr_server, m_registered, ms_server, m_registered, m_ignore }
249 0, MAXPARA, MFLG_SLOW, 0,
250 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
251 { m_unregistered, m_not_oper, ms_squit, mo_squit, m_ignore }
256 0, MAXPARA, MFLG_SLOW, 0,
257 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
258 { m_unregistered, m_whois, m_whois, m_whois, m_ignore }
263 0, MAXPARA, MFLG_SLOW, 0,
264 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
265 { m_unregistered, m_who, m_ignore, m_who, m_ignore }
270 0, MAXPARA, MFLG_SLOW, 0,
271 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
272 { m_unregistered, m_whowas, m_whowas, m_whowas, m_ignore }
277 0, MAXPARA, MFLG_SLOW, 0,
278 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
279 { m_unregistered, m_list, m_ignore, m_list, m_ignore }
284 0, MAXPARA, MFLG_SLOW, 0,
285 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
286 { m_unregistered, m_names, ms_names, m_names, m_ignore }
292 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
293 { m_unregistered, m_userhost, m_ignore, m_userhost, m_ignore }
299 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
300 { m_unregistered, m_userip, m_ignore, m_userip, m_ignore }
305 0, MAXPARA, MFLG_SLOW, 0,
306 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
307 { m_unregistered, m_trace, ms_trace, mo_trace, m_ignore }
312 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0,
313 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
314 { m_pass, m_registered, m_ignore, m_registered, m_ignore }
319 0, MAXPARA, MFLG_SLOW, 0,
320 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
321 { m_unregistered, m_lusers, ms_lusers, m_lusers, m_ignore }
326 0, MAXPARA, MFLG_SLOW, 0,
327 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
328 { m_unregistered, m_time, m_time, m_time, m_ignore }
333 0, MAXPARA, MFLG_SLOW, 0,
334 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
335 { m_unregistered, m_ignore, ms_settime, mo_settime, m_ignore }
340 0, MAXPARA, MFLG_SLOW, 0,
341 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
342 { m_unregistered, m_not_oper, ms_rping, mo_rping, m_ignore }
347 0, MAXPARA, MFLG_SLOW, 0,
348 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
349 { m_unregistered, m_ignore, ms_rpong, m_ignore, m_ignore }
354 0, MAXPARA, MFLG_SLOW, 0,
355 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
356 { m_unregistered, m_oper, ms_oper, mo_oper, m_ignore }
361 0, MAXPARA, MFLG_SLOW, 0,
362 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
363 { m_unregistered, m_not_oper, ms_connect, mo_connect, m_ignore }
368 0, MAXPARA, MFLG_SLOW, 0,
369 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
370 { m_unregistered, m_map, m_ignore, m_map, m_ignore }
375 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0,
376 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
377 { m_version, m_version, ms_version, m_version, m_ignore }
382 0, MAXPARA, MFLG_SLOW, 0,
383 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
384 { m_unregistered, m_stats, ms_stats, mo_stats, m_ignore }
389 0, MAXPARA, MFLG_SLOW, 0,
390 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
391 { m_unregistered, m_links, ms_links, m_links, m_ignore }
396 0, MAXPARA, MFLG_SLOW | MFLG_UNREG, 0,
397 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
398 { m_admin, m_admin, ms_admin, m_admin, m_ignore }
403 0, MAXPARA, MFLG_SLOW, 0,
404 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
405 { m_unregistered, m_help, m_ignore, m_help, m_ignore }
410 0, MAXPARA, MFLG_SLOW, 0,
411 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
412 { m_unregistered, m_info, ms_info, mo_info, m_ignore }
417 0, MAXPARA, MFLG_SLOW, 0,
418 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
419 { m_unregistered, m_motd, m_motd, m_motd, m_ignore }
424 0, MAXPARA, MFLG_SLOW, 0,
425 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
426 { m_unregistered, m_not_oper, m_ignore, mo_close, m_ignore }
431 0, MAXPARA, MFLG_SLOW, 0,
432 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
433 { m_unregistered, m_silence, ms_silence, m_silence, m_ignore }
438 0, MAXPARA, MFLG_SLOW, 0,
439 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
440 { m_unregistered, m_not_oper, ms_gline, mo_gline, m_ignore }
445 0, MAXPARA, MFLG_SLOW, 0,
446 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
447 { m_unregistered, m_jupe, ms_jupe, mo_jupe, m_ignore }
452 0, MAXPARA, MFLG_SLOW, 0,
453 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
454 { m_unregistered, m_not_oper, ms_uping, mo_uping, m_ignore }
459 0, MAXPARA, MFLG_SLOW, 0,
460 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
461 { m_ignore, m_ignore, ms_end_of_burst, m_ignore, m_ignore }
464 MSG_END_OF_BURST_ACK,
465 TOK_END_OF_BURST_ACK,
467 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
468 { m_ignore, m_ignore, ms_end_of_burst_ack, m_ignore, m_ignore }
473 0, MAXPARA, MFLG_SLOW, 0,
474 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
475 { m_unregistered, m_hash, m_hash, m_hash, m_ignore }
480 0, MAXPARA, MFLG_SLOW, 0,
481 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
482 { m_unregistered, m_dns, m_dns, m_dns, m_ignore }
487 0, MAXPARA, MFLG_SLOW, 0,
488 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
489 { m_unregistered, m_not_oper, m_ignore, mo_rehash, m_ignore }
494 0, MAXPARA, MFLG_SLOW, 0,
495 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
496 { m_unregistered, m_not_oper, m_ignore, mo_restart, m_ignore }
501 0, MAXPARA, MFLG_SLOW, 0,
502 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
503 { m_unregistered, m_not_oper, m_ignore, mo_die, m_ignore }
508 0, MAXPARA, MFLG_SLOW, 0,
509 /* UNREG, CLIENT, SERVER, OPER, SERVICE */
510 { m_proto, m_proto, m_proto, m_proto, m_ignore }
520 static char *para[MAXPARA + 2]; /* leave room for prefix and null */
523 * Message Tree stuff mostly written by orabidoo, with changes by Dianora.
524 * Adapted to Undernet, adding token support, etc by comstud 10/06/97
527 static struct MessageTree msg_tree_cmd;
528 static struct MessageTree msg_tree_tok;
531 * Guts of making the token tree...
533 static struct Message **do_msg_tree_tok(struct MessageTree *mtree, char *prefix,
534 struct Message **mptr)
536 char newprefix[64]; /* Must be longer than every command name */
538 struct MessageTree *mtree1;
541 if (!lp || !strncmp((*mptr)->tok, prefix, lp))
543 if (!mptr[1] || (lp && strncmp(mptr[1]->tok, prefix, lp)))
545 /* last command in the message struct or last command in this prefix */
546 mtree->final = (*mptr)->tok + lp;
548 for (c = 0; c < 26; ++c)
549 mtree->pointers[c] = NULL;
552 /* command in this prefix */
553 if (0 == ircd_strcmp((*mptr)->tok, prefix))
556 mtree->msg = *mptr++;
561 for (c = 'A'; c <= 'Z'; ++c)
563 if ((*mptr)->tok[lp] == c)
565 mtree1 = (struct MessageTree *)MyMalloc(sizeof(struct MessageTree));
566 mtree1->final = NULL;
567 mtree->pointers[c - 'A'] = mtree1;
568 strcpy(newprefix, prefix);
570 newprefix[lp + 1] = '\0';
571 mptr = do_msg_tree_tok(mtree1, newprefix, mptr);
572 if (!*mptr || strncmp((*mptr)->tok, prefix, lp))
574 for (c2 = c + 1 - 'A'; c2 < 26; ++c2)
575 mtree->pointers[c2] = NULL;
580 mtree->pointers[c - 'A'] = NULL;
585 * XXX - should never be here, quick hack, this can be done better
592 * Guts of making the command tree...
594 static struct Message *do_msg_tree_cmd(struct MessageTree *mtree, char *prefix,
595 struct Message *mptr)
597 char newprefix[64]; /* Must be longer than every command name */
599 struct MessageTree *mtree1;
602 if (!lp || !strncmp(mptr->cmd, prefix, lp))
604 if (!mptr[1].cmd || (lp && strncmp(mptr[1].cmd, prefix, lp)))
606 /* last command in the message struct or last command in this prefix */
607 mtree->final = mptr->cmd + lp;
609 for (c = 0; c < 26; ++c)
610 mtree->pointers[c] = NULL;
613 /* command in this prefix */
614 if (0 == ircd_strcmp(mptr->cmd, prefix))
622 for (c = 'A'; c <= 'Z'; ++c)
624 if (mptr->cmd[lp] == c)
626 mtree1 = (struct MessageTree *)MyMalloc(sizeof(struct MessageTree));
627 mtree1->final = NULL;
628 mtree->pointers[c - 'A'] = mtree1;
629 strcpy(newprefix, prefix);
631 newprefix[lp + 1] = '\0';
632 mptr = do_msg_tree_cmd(mtree1, newprefix, mptr);
633 if (!mptr->cmd || strncmp(mptr->cmd, prefix, lp))
635 for (c2 = c + 1 - 'A'; c2 < 26; ++c2)
636 mtree->pointers[c2] = NULL;
641 mtree->pointers[c - 'A'] = NULL;
646 * This should never happen
652 static int mcmdcmp(const struct Message *m1, const struct Message *m2)
654 return strcmp(m1->cmd, m2->cmd);
657 static int mtokcmp(const struct Message **m1, const struct Message **m2)
659 return strcmp((*m1)->tok, (*m2)->tok);
663 * Sort the command names.
664 * Create table of pointers into msgtab for tokens.
665 * Create trees for ->cmd and ->tok and free the token pointers.
667 void initmsgtree(void)
670 struct Message *msg = msgtab;
672 struct Message **msgtab_tok;
673 struct Message **msgtok;
675 for (i = 0; msg->cmd; ++i, ++msg)
677 qsort(msgtab, i, sizeof(struct Message),
678 (int (*)(const void *, const void *))mcmdcmp);
679 msgtab_tok = (struct Message **)MyMalloc((i + 1) * sizeof(struct Message *));
680 for (ii = 0; ii < i; ++ii)
681 msgtab_tok[ii] = msgtab + ii;
682 msgtab_tok[i] = NULL; /* Needed by `do_msg_tree_tok' */
683 qsort(msgtab_tok, i, sizeof(struct Message *),
684 (int (*)(const void *, const void *))mtokcmp);
685 msg = do_msg_tree_cmd(&msg_tree_cmd, "", msgtab);
686 msgtok = do_msg_tree_tok(&msg_tree_tok, "", msgtab_tok);
691 * Generic tree parser which works for both commands and tokens.
694 static struct Message *msg_tree_parse(char *cmd, struct MessageTree *root)
696 struct MessageTree *mtree;
697 unsigned char r = (0xdf & (unsigned char)*cmd) - 'A';
698 if (r > 25 || !(mtree = root->pointers[r]))
702 r = 0xdf & (unsigned char)*++cmd;
703 if (mtree->final && *mtree->final == r)
705 if ((r -= 'A') > 25 || !(mtree = mtree->pointers[r]))
711 * This one is identical to the one above, but it is slower because it
712 * makes sure that `cmd' matches the _full_ command, exactly.
713 * This is to avoid confusion with commands like /quake on clients
714 * that send unknown commands directly to the server.
716 static struct Message *msg_tree_parse_client(char *cmd,
717 struct MessageTree *root)
719 struct MessageTree *mtree;
720 unsigned char q = (0xdf & (unsigned char)*cmd) - 'A';
721 if (q > 25 || !(mtree = root->pointers[q]))
725 q = 0xdf & (unsigned char)*++cmd;
726 if (mtree->final && 0 == ircd_strcmp(mtree->final, cmd))
728 if ((q -= 'A') > 25 || !(mtree = mtree->pointers[q]))
736 * NOTE: parse_*() should not be called recusively by any other fucntions!
738 int parse_client(struct Client *cptr, char *buffer, char *bufend)
740 struct Client* from = cptr;
746 struct Message* mptr;
747 MessageHandler handler = 0;
749 Debug((DEBUG_DEBUG, "Parsing: %s", buffer));
754 para[0] = from->name;
755 for (ch = buffer; *ch == ' '; ch++); /* Eat leading spaces */
756 if (*ch == ':') /* Is any client doing this ? */
758 for (++ch; *ch && *ch != ' '; ++ch)
759 ; /* Ignore sender prefix from client */
761 ch++; /* Advance to command */
767 ServerStats->is_empt++;
768 Debug((DEBUG_NOTICE, "Empty message from host %s:%s",
769 cptr->name, from->name));
773 if ((s = strchr(ch, ' ')))
777 * This is a client/unregistered entity.
778 * Check long command list only.
780 if (!(mptr = msg_tree_parse_client(ch, &msg_tree_cmd)))
783 * Note: Give error message *only* to recognized
784 * persons. It's a nightmare situation to have
785 * two programs sending "Unknown command"'s or
786 * equivalent to each other at full blast....
787 * If it has got to person state, it at least
788 * seems to be well behaving. Perhaps this message
789 * should never be generated, though... --msa
790 * Hm, when is the buffer empty -- if a command
791 * code has been found ?? -Armin
793 if (buffer[0] != '\0')
796 sendto_one(from, ":%s %d %s %s :Unknown command",
797 me.name, ERR_UNKNOWNCOMMAND, from->name, ch);
798 Debug((DEBUG_ERROR, "Unknown (%s) from %s",
799 ch, get_client_name(cptr, HIDE_IP)));
801 ServerStats->is_unco++;
805 paramcount = mptr->parameters;
806 i = bufend - ((s) ? s : ch);
808 if ((mptr->flags & MFLG_SLOW))
809 cptr->since += (2 + i / 120);
811 * Allow only 1 msg per 2 seconds
812 * (on average) to prevent dumping.
813 * to keep the response rate up,
814 * bursts of up to 5 msgs are allowed
819 * Must the following loop really be so devious? On
820 * surface it splits the message to parameters from
821 * blank spaces. But, if paramcount has been reached,
822 * the rest of the message goes into this last parameter
823 * (about same effect as ":" has...) --msa
826 /* Note initially true: s==NULL || *(s-1) == '\0' !! */
831 if (paramcount > MAXPARA)
832 paramcount = MAXPARA;
836 * Never "FRANCE " again!! ;-) Clean
837 * out *all* blanks.. --msa
847 * The rest is single parameter--can
848 * include blanks also.
856 for (; *s != ' ' && *s; s++);
863 * The "unregistered command check" was ugly and mildly inefficient.
864 * I fixed it. :) --Shadow
866 if (!IsUser(cptr) && 0 == (mptr->flags & MFLG_UNREG)) {
867 if (0 == (mptr->flags & MFLG_IGNORE))
868 sendto_one(from, ":%s %d * %s :Register first.",
869 me.name, ERR_NOTREGISTERED, ch);
873 handler = mptr->handlers[cptr->handler];
874 assert(0 != handler);
876 #ifndef IDLE_FROM_MSG
877 if (IsUser(cptr) && handler != m_ping && handler != m_ignore)
878 from->user->last = CurrentTime;
881 return (*handler) (cptr, from, i, para);
884 int parse_server(struct Client *cptr, char *buffer, char *bufend)
886 struct Client* from = cptr;
893 struct Message* mptr;
895 Debug((DEBUG_DEBUG, "Parsing: %s", buffer));
898 len = strlen(buffer);
902 char c = buffer[200];
904 sendto_ops("RCV:%-8.8s(%.4d): \"%s...%s\"",
905 cptr->name, len, buffer, &buffer[len - 200]);
909 sendto_ops("RCV:%-8.8s(%.4d): \"%s\"", cptr->name, len, buffer);
916 para[0] = from->name;
919 * A server ALWAYS sends a prefix. When it starts with a ':' it's the
920 * protocol 9 prefix: a nick or a server name. Otherwise it's a numeric
925 /* Let para[0] point to the name of the sender */
927 if (!(ch = strchr(ch, ' ')))
931 /* And let `from' point to its client structure,
932 opps.. a server is _also_ a client --Nem */
933 from = FindClient(para[0]);
936 * If the client corresponding to the
937 * prefix is not found. We must ignore it,
938 * it is simply a lagged message travelling
939 * upstream a SQUIT that removed the client
944 Debug((DEBUG_NOTICE, "Unknown prefix (%s)(%s) from (%s)",
945 para[0], buffer, cptr->name));
946 ++ServerStats->is_unpf;
950 * However, the only thing that MUST be
951 * allowed to travel upstream against an
952 * squit, is an SQUIT itself (the timestamp
953 * protects us from being used wrong)
957 para[0] = cptr->name;
963 else if (from->from != cptr)
965 ++ServerStats->is_wrdi;
966 Debug((DEBUG_NOTICE, "Fake direction: Message (%s) coming from (%s)",
967 buffer, cptr->name));
971 else if (Protocol(cptr) > 9) /* Well, not ALWAYS, 2.9 can send no prefix */
973 char numeric_prefix[6];
975 for (i = 0; i < 5; ++i) {
976 if ('\0' == ch[i] || ' ' == (numeric_prefix[i] = ch[i])) {
980 numeric_prefix[i] = '\0';
982 * We got a numeric nick as prefix
983 * 1 or 2 character prefixes are from servers
984 * 3 or 5 chars are from clients
986 if (' ' == ch[1] || ' ' == ch[2])
987 from = FindNServer(numeric_prefix);
989 from = findNUser(numeric_prefix);
995 while (*ch != ' ' && *ch);
998 * If the client corresponding to the
999 * prefix is not found. We must ignore it,
1000 * it is simply a lagged message travelling
1001 * upstream a SQUIT that removed the client
1003 * There turned out to be other reasons that
1004 * a prefix is unknown, needing an upstream
1005 * KILL. Also, next to an SQUIT we better
1006 * allow a KILL to pass too.
1011 ServerStats->is_unpf++;
1014 if (*ch == 'N' && (ch[1] == ' ' || ch[1] == 'I'))
1015 /* Only sent a KILL for a nick change */
1017 struct Client *server;
1018 /* Kill the unknown numeric prefix upstream if
1019 * it's server still exists: */
1020 if ((server = FindNServer(numeric_prefix)) && server->from == cptr)
1021 sendto_one(cptr, "%s KILL %s :%s (Unknown numeric nick)",
1022 NumServ(&me), numeric_prefix, me.name);
1025 * Things that must be allowed to travel
1026 * upstream against an squit:
1028 if (ch[1] == 'Q' || (*ch == 'D' && ch[1] == ' ') ||
1029 (*ch == 'K' && ch[2] == 'L'))
1035 /* Let para[0] point to the name of the sender */
1036 para[0] = from->name;
1038 if (from->from != cptr)
1040 ServerStats->is_wrdi++;
1041 Debug((DEBUG_NOTICE, "Fake direction: Message (%s) coming from (%s)",
1042 buffer, cptr->name));
1051 ServerStats->is_empt++;
1052 Debug((DEBUG_NOTICE, "Empty message from host %s:%s",
1053 cptr->name, from->name));
1058 * Extract the command code from the packet. Point s to the end
1059 * of the command code and calculate the length using pointer
1060 * arithmetic. Note: only need length for numerics and *all*
1061 * numerics must have parameters and thus a space after the command
1064 s = strchr(ch, ' '); /* s -> End of the command code */
1065 len = (s) ? (s - ch) : 0;
1066 if (len == 3 && IsDigit(*ch))
1068 numeric = (*ch - '0') * 100 + (*(ch + 1) - '0') * 10 + (*(ch + 2) - '0');
1069 paramcount = MAXPARA;
1070 ServerStats->is_num++;
1071 mptr = NULL; /* Init. to avoid stupid compiler warning :/ */
1078 /* Version Receive Send
1080 * 2.10.0 Tkn/Long Long
1081 * 2.10.10 Tkn/Long Tkn
1084 * Clients/unreg servers always receive/
1085 * send long commands -record
1089 * This is a server. Check the token command list.
1090 * -record!jegelhof@cloud9.net
1092 mptr = msg_tree_parse(ch, &msg_tree_tok);
1094 #if 1 /* for 2.10.0/2.10.10 */
1096 * This code supports 2.9 and 2.10.0 sending long commands.
1097 * It makes more calls to ircd_strcmp() than the above
1098 * so it will be somewhat slower.
1101 mptr = msg_tree_parse(ch, &msg_tree_cmd);
1107 * Note: Give error message *only* to recognized
1108 * persons. It's a nightmare situation to have
1109 * two programs sending "Unknown command"'s or
1110 * equivalent to each other at full blast....
1111 * If it has got to person state, it at least
1112 * seems to be well behaving. Perhaps this message
1113 * should never be generated, though... --msa
1114 * Hm, when is the buffer empty -- if a command
1115 * code has been found ?? -Armin
1118 if (buffer[0] != '\0')
1120 Debug((DEBUG_ERROR, "Unknown (%s) from %s",
1121 ch, get_client_name(cptr, HIDE_IP)));
1124 ServerStats->is_unco++;
1128 paramcount = mptr->parameters;
1129 i = bufend - ((s) ? s : ch);
1133 * Must the following loop really be so devious? On
1134 * surface it splits the message to parameters from
1135 * blank spaces. But, if paramcount has been reached,
1136 * the rest of the message goes into this last parameter
1137 * (about same effect as ":" has...) --msa
1140 /* Note initially true: s==NULL || *(s-1) == '\0' !! */
1145 if (paramcount > MAXPARA)
1146 paramcount = MAXPARA;
1150 * Never "FRANCE " again!! ;-) Clean
1151 * out *all* blanks.. --msa
1161 * The rest is single parameter--can
1162 * include blanks also.
1168 if (i >= paramcount)
1170 for (; *s != ' ' && *s; s++);
1175 return (do_numeric(numeric, (*buffer != ':'), cptr, from, i, para));
1178 return (*mptr->handlers[cptr->handler]) (cptr, from, i, para);