2 * IRC - Internet Relay Chat, ircd/m_burst.c
3 * Copyright (C) 1990 Jarkko Oikarinen and
4 * University of Oulu, Computing Center
6 * See file AUTHORS in IRC package for additional names of
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 1, or (at your option)
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 * m_functions execute protocol messages on this server:
29 * cptr is always NON-NULL, pointing to a *LOCAL* client
30 * structure (with an open socket connected!). This
31 * identifies the physical socket where the message
32 * originated (or which caused the m_function to be
33 * executed--some m_functions may call others...).
35 * sptr is the source of the message, defined by the
36 * prefix part of the message if present. If not
37 * or prefix not found, then sptr==cptr.
39 * (!IsServer(cptr)) => (cptr == sptr), because
40 * prefixes are taken *only* from servers...
43 * (sptr == cptr) => the message didn't
46 * (sptr != cptr && IsServer(sptr) means
47 * the prefix specified servername. (?)
49 * (sptr != cptr && !IsServer(sptr) means
50 * that message originated from a remote
55 * (!IsServer(sptr)) means that, sptr can safely
56 * taken as defining the target structure of the
57 * message in this server.
59 * *Always* true (if 'parse' and others are working correct):
61 * 1) sptr->from == cptr (note: cptr->from == cptr)
63 * 2) MyConnect(sptr) <=> sptr == cptr (e.g. sptr
64 * *cannot* be a local connection, unless it's
65 * actually cptr!). [MyConnect(x) should probably
66 * be defined as (x == x->from) --msa ]
68 * parc number of variable parameter strings (if zero,
69 * parv is allowed to be NULL)
71 * parv a NULL terminated list of parameter pointers,
73 * parv[0], sender (prefix string), if not present
74 * this points to an empty string.
75 * parv[1]...parv[parc-1]
76 * pointers to additional parameters
77 * parv[parc] == NULL, *always*
79 * note: it is guaranteed that parv[0]..parv[parc-1] are all
88 #include "ircd_alloc.h"
89 #include "ircd_features.h"
90 #include "ircd_reply.h"
91 #include "ircd_string.h"
102 #include "ircd_snprintf.h"
110 netride_modes(int parc, char **parv, const char *curr_key)
112 char *modes = parv[0];
115 assert(modes && modes[0] == '+');
119 result |= MODE_INVITEONLY;
122 if (strcmp(curr_key, *++parv))
129 result |= MODE_REGONLY;
137 * ms_burst - server message handler
139 * -- by Run carlo@runaway.xs4all.nl december 1995 till march 1997
141 * parv[0] = sender prefix
142 * parv[1] = channel name
143 * parv[2] = channel timestamp
144 * The meaning of the following parv[]'s depend on their first character:
145 * If parv[n] starts with a '+':
146 * Net burst, additive modes
148 * parv[n+1] = <param> (optional)
149 * parv[n+2] = <param> (optional)
150 * If parv[n] starts with a '%', then n will be parc-1:
151 * parv[n] = %<ban> <ban> <ban> ...
152 * If parv[n] starts with another character:
153 * parv[n] = <nick>[:<mode>],<nick>[:<mode>],...
154 * where <mode> defines the mode and op-level
155 * for nick and all following nicks until the
157 * Digits in the <mode> field have of two meanings:
158 * 1) if it is the first field in this BURST message
159 * that contains digits, and/or when a 'v' is
160 * present in the <mode>:
161 * The absolute value of the op-level.
162 * 2) if there are only digits in this field and
163 * it is not the first field with digits:
164 * An op-level increment relative to the previous
166 * First all modeless nicks must be emmitted,
167 * then all combinations of modes without ops
168 * (currently that is only 'v') followed by the same
169 * series but then with ops (currently 'o','ov').
172 * "A8 B #test 87654321 +ntkAl key secret 123 A8AAG,A8AAC:v,A8AAA:0,A8AAF:2,A8AAD,A8AAB:v1,A8AAE:1 :%ban1 ban2"
174 * <mode> list example:
176 * "xxx,sss:v,ttt,aaa:123,bbb,ccc:2,ddd,kkk:v2,lll:2,mmm"
180 * xxx // first modeless nicks
181 * sss +v // then opless nicks
182 * ttt +v // no ":<mode>": everything stays the same
183 * aaa -123 // first field with digit: absolute value
185 * ccc -125 // only digits, not first field: increment
187 * kkk -2 +v // field with a 'v': absolute value
188 * lll -4 +v // only digits: increment
191 * Anti net.ride code.
193 * When the channel already exist, and its TS is larger than
194 * the TS in the BURST message, then we cancel all existing modes.
195 * If its is smaller then the received BURST message is ignored.
196 * If it's equal, then the received modes are just added.
198 * BURST is also accepted outside a netburst now because it
199 * is sent upstream as reaction to a DESTRUCT message. For
200 * these BURST messages it is possible that the listed channel
201 * members are already joined.
203 int ms_burst(struct Client *cptr, struct Client *sptr, int parc, char *parv[])
205 struct ModeBuf modebuf, *mbuf = 0;
206 struct Channel *chptr;
208 struct Membership *member, *nmember;
209 struct SLink *lp, **lp_p;
210 unsigned int parse_flags = (MODE_PARSE_FORCE | MODE_PARSE_BURST);
211 int param, nickpos = 0, banpos = 0;
212 char modestr[BUFSIZE], nickstr[BUFSIZE], banstr[BUFSIZE];
215 return protocol_violation(sptr,"Too few parameters for BURST");
217 if (!(chptr = get_channel(sptr, parv[1], CGT_CREATE)))
218 return 0; /* can't create the channel? */
220 timestamp = atoi(parv[2]);
222 if (!chptr->creationtime || chptr->creationtime > timestamp) {
224 * Kick local members if channel is +i or +k and our TS was larger
225 * than the burst TS (anti net.ride). The modes hack is here because
226 * we have to do this before mode_parse, as chptr may go away.
228 for (param = 3; param < parc; param++)
231 if (parv[param][0] != '+')
233 check_modes = netride_modes(parc - param, parv + param, chptr->mode.key);
236 /* Clear any outstanding rogue invites */
237 mode_invite_clear(chptr);
238 for (member = chptr->members; member; member = nmember)
240 nmember = member->next_member;
241 if (!MyUser(member->user) || IsZombie(member))
243 /* Kick as netrider if key mismatch *or* remote channel is +i
244 * *or* remote channel is +r and user has no account.
246 if ((check_modes == MODE_REGONLY) && IsAccount(member->user))
248 sendcmdto_serv_butone(&me, CMD_KICK, NULL, "%H %C :Net Rider", chptr, member->user);
249 sendcmdto_channel_butserv_butone(&me, CMD_KICK, chptr, NULL, 0, "%H %C :Net Rider", chptr, member->user);
250 make_zombie(member, member->user, &me, &me, chptr);
256 /* If the channel had only locals, it went away by now. */
257 if (!(chptr = get_channel(sptr, parv[1], CGT_CREATE)))
258 return 0; /* can't create the channel? */
261 /* turn off burst joined flag */
262 for (member = chptr->members; member; member = member->next_member)
263 member->status &= ~(CHFL_BURST_JOINED|CHFL_BURST_ALREADY_OPPED|CHFL_BURST_ALREADY_VOICED);
265 if (!chptr->creationtime) /* mark channel as created during BURST */
266 chptr->mode.mode |= MODE_BURSTADDED;
268 /* new channel or an older one */
269 if (!chptr->creationtime || chptr->creationtime > timestamp) {
270 chptr->creationtime = timestamp;
272 modebuf_init(mbuf = &modebuf, &me, cptr, chptr,
273 MODEBUF_DEST_CHANNEL | MODEBUF_DEST_NOKEY);
274 modebuf_mode(mbuf, MODE_DEL | chptr->mode.mode); /* wipeout modes */
275 chptr->mode.mode &= ~(MODE_ADD | MODE_DEL | MODE_PRIVATE | MODE_SECRET |
276 MODE_MODERATED | MODE_TOPICLIMIT | MODE_INVITEONLY |
277 MODE_NOPRIVMSGS | MODE_DELJOINS);
279 parse_flags |= (MODE_PARSE_SET | MODE_PARSE_WIPEOUT); /* wipeout keys */
281 /* mark bans for wipeout */
282 for (lp = chptr->banlist; lp; lp = lp->next)
283 lp->flags |= CHFL_BURST_BAN_WIPEOUT;
285 /* clear topic set by netrider (if set) */
287 *chptr->topic = '\0';
288 *chptr->topic_nick = '\0';
289 chptr->topic_time = 0;
290 sendcmdto_channel_butserv_butone(&me, CMD_TOPIC, chptr, NULL, 0,
291 "%H :%s", chptr, chptr->topic);
293 } else if (chptr->creationtime == timestamp) {
294 modebuf_init(mbuf = &modebuf, &me, cptr, chptr,
295 MODEBUF_DEST_CHANNEL | MODEBUF_DEST_NOKEY);
297 parse_flags |= MODE_PARSE_SET; /* set new modes */
300 param = 3; /* parse parameters */
301 while (param < parc) {
302 switch (*parv[param]) {
303 case '+': /* parameter introduces a mode string */
304 param += mode_parse(mbuf, cptr, sptr, chptr, parc - param,
305 parv + param, parse_flags, NULL);
308 case '%': /* parameter contains bans */
309 if (parse_flags & MODE_PARSE_SET) {
310 char *banlist = parv[param] + 1, *p = 0, *ban, *ptr;
311 struct SLink *newban;
313 for (ban = ircd_strtok(&p, banlist, " "); ban;
314 ban = ircd_strtok(&p, 0, " ")) {
315 ban = collapse(pretty_mask(ban));
318 * Yeah, we should probably do this elsewhere, and make it better
319 * and more general; this will hold until we get there, though.
320 * I dislike the current add_banid API... -Kev
322 * I wish there were a better algo. for this than the n^2 one
325 for (lp = chptr->banlist; lp; lp = lp->next) {
326 if (!ircd_strcmp(lp->value.ban.banstr, ban)) {
327 ban = 0; /* don't add ban */
328 lp->flags &= ~CHFL_BURST_BAN_WIPEOUT; /* not wiping out */
329 break; /* new ban already existed; don't even repropagate */
330 } else if (!(lp->flags & CHFL_BURST_BAN_WIPEOUT) &&
331 !mmatch(lp->value.ban.banstr, ban)) {
332 ban = 0; /* don't add ban unless wiping out bans */
333 break; /* new ban is encompassed by an existing one; drop */
334 } else if (!mmatch(ban, lp->value.ban.banstr))
335 lp->flags |= CHFL_BAN_OVERLAPPED; /* remove overlapping ban */
341 if (ban) { /* add the new ban to the end of the list */
342 /* Build ban buffer */
344 banstr[banpos++] = ' ';
345 banstr[banpos++] = ':';
346 banstr[banpos++] = '%';
348 banstr[banpos++] = ' ';
349 for (ptr = ban; *ptr; ptr++) /* add ban to buffer */
350 banstr[banpos++] = *ptr;
352 newban = make_link(); /* create new ban */
354 DupString(newban->value.ban.banstr, ban);
356 DupString(newban->value.ban.who,
357 cli_name(feature_bool(FEAT_HIS_BANWHO) ? &me : sptr));
358 newban->value.ban.when = TStime();
360 newban->flags = CHFL_BAN | CHFL_BURST_BAN; /* set flags */
361 if ((ptr = strrchr(ban, '@')) && check_if_ipmask(ptr + 1))
362 newban->flags |= CHFL_BAN_IPMASK;
366 lp->next = newban; /* link it in */
368 chptr->banlist = newban;
372 param++; /* look at next param */
375 default: /* parameter contains clients */
377 struct Client *acptr;
378 char *nicklist = parv[param], *p = 0, *nick, *ptr;
379 int current_mode, last_mode, base_mode;
380 int oplevel = -1; /* Mark first field with digits: means the same as 'o' (but with level). */
381 int last_oplevel = 0;
382 struct Membership* member;
384 base_mode = CHFL_DEOPPED | CHFL_BURST_JOINED;
385 if (chptr->mode.mode & MODE_DELJOINS)
386 base_mode |= CHFL_DELAYED;
387 current_mode = last_mode = base_mode;
389 for (nick = ircd_strtok(&p, nicklist, ","); nick;
390 nick = ircd_strtok(&p, 0, ",")) {
392 if ((ptr = strchr(nick, ':'))) { /* new flags; deal */
395 if (parse_flags & MODE_PARSE_SET) {
396 int current_mode_needs_reset;
397 for (current_mode_needs_reset = 1; *ptr; ptr++) {
398 if (*ptr == 'o') { /* has oper status */
400 * An 'o' is pre-oplevel protocol, so this is only for
401 * backwards compatibility. Give them an op-level of
402 * MAXOPLEVEL so everyone can deop them.
404 oplevel = MAXOPLEVEL;
405 if (current_mode_needs_reset) {
406 current_mode = base_mode;
407 current_mode_needs_reset = 0;
409 current_mode = (current_mode & ~(CHFL_DEOPPED | CHFL_DELAYED)) | CHFL_CHANOP;
411 else if (*ptr == 'v') { /* has voice status */
412 if (current_mode_needs_reset) {
413 current_mode = base_mode;
414 current_mode_needs_reset = 0;
416 current_mode = (current_mode & ~CHFL_DELAYED) | CHFL_VOICE;
417 oplevel = -1; /* subsequential digits are an absolute op-level value. */
419 else if (isdigit(*ptr)) {
420 int level_increment = 0;
421 if (oplevel == -1) { /* op-level is absolute value? */
422 if (current_mode_needs_reset) {
423 current_mode = base_mode;
424 current_mode_needs_reset = 0;
428 current_mode = (current_mode & ~(CHFL_DEOPPED | CHFL_DELAYED)) | CHFL_CHANOP;
430 level_increment = 10 * level_increment + *ptr++ - '0';
431 } while(isdigit(*ptr));
432 oplevel += level_increment;
434 else /* I don't recognize that flag */
435 break; /* so stop processing */
440 if (!(acptr = findNUser(nick)) || cli_from(acptr) != cptr)
441 continue; /* ignore this client */
443 /* Build nick buffer */
444 nickstr[nickpos] = nickpos ? ',' : ' '; /* first char */
447 for (ptr = nick; *ptr; ptr++) /* store nick */
448 nickstr[nickpos++] = *ptr;
450 if (current_mode != last_mode) { /* if mode changed... */
451 last_mode = current_mode;
452 last_oplevel = oplevel;
454 nickstr[nickpos++] = ':'; /* add a specifier */
455 if (current_mode & CHFL_VOICE)
456 nickstr[nickpos++] = 'v';
457 if (current_mode & CHFL_CHANOP)
458 nickpos += ircd_snprintf(0, nickstr + nickpos, sizeof(nickstr) - nickpos, "%u", oplevel);
459 } else if (current_mode & CHFL_CHANOP && oplevel != last_oplevel) { /* if just op level changed... */
460 nickstr[nickpos++] = ':'; /* add a specifier */
461 nickpos += ircd_snprintf(0, nickstr + nickpos, sizeof(nickstr) - nickpos, "%u", oplevel - last_oplevel);
462 last_oplevel = oplevel;
465 if (IsBurst(sptr) || !(member = find_member_link(chptr, acptr)))
467 add_user_to_channel(chptr, acptr, current_mode, oplevel);
468 if (!(current_mode & CHFL_DELAYED))
469 sendcmdto_channel_butserv_butone(acptr, CMD_JOIN, chptr, NULL, 0, "%H", chptr);
473 /* The member was already joined (either by CREATE or JOIN).
474 Remember the current mode. */
475 if (member->status & CHFL_CHANOP)
476 member->status |= CHFL_BURST_ALREADY_OPPED;
477 if (member->status & CHFL_VOICE)
478 member->status |= CHFL_BURST_ALREADY_VOICED;
479 /* Synchronize with the burst. */
480 member->status |= CHFL_BURST_JOINED | (current_mode & (CHFL_CHANOP|CHFL_VOICE));
481 member->oplevel = oplevel;
487 } /* switch (*parv[param]) */
488 } /* while (param < parc) */
490 nickstr[nickpos] = '\0';
491 banstr[banpos] = '\0';
493 if (parse_flags & MODE_PARSE_SET) {
494 modebuf_extract(mbuf, modestr + 1); /* for sending BURST onward */
495 modestr[0] = modestr[1] ? ' ' : '\0';
499 sendcmdto_serv_butone(sptr, CMD_BURST, cptr, "%H %Tu%s%s%s", chptr,
500 chptr->creationtime, modestr, nickstr, banstr);
502 if (parse_flags & MODE_PARSE_WIPEOUT || banpos)
503 mode_ban_invalidate(chptr);
505 if (parse_flags & MODE_PARSE_SET) { /* any modes changed? */
506 /* first deal with channel members */
507 for (member = chptr->members; member; member = member->next_member) {
508 if (member->status & CHFL_BURST_JOINED) { /* joined during burst */
509 if ((member->status & CHFL_CHANOP) && !(member->status & CHFL_BURST_ALREADY_OPPED))
510 modebuf_mode_client(mbuf, MODE_ADD | CHFL_CHANOP, member->user);
511 if ((member->status & CHFL_VOICE) && !(member->status & CHFL_BURST_ALREADY_VOICED))
512 modebuf_mode_client(mbuf, MODE_ADD | CHFL_VOICE, member->user);
513 } else if (parse_flags & MODE_PARSE_WIPEOUT) { /* wipeout old ops */
514 if (member->status & CHFL_CHANOP)
515 modebuf_mode_client(mbuf, MODE_DEL | CHFL_CHANOP, member->user);
516 if (member->status & CHFL_VOICE)
517 modebuf_mode_client(mbuf, MODE_DEL | CHFL_VOICE, member->user);
518 member->status = ((member->status & ~(CHFL_CHANOP | CHFL_VOICE)) |
523 /* Now deal with channel bans */
524 lp_p = &chptr->banlist;
528 /* remove ban from channel */
529 if (lp->flags & (CHFL_BAN_OVERLAPPED | CHFL_BURST_BAN_WIPEOUT)) {
530 modebuf_mode_string(mbuf, MODE_DEL | MODE_BAN,
531 lp->value.ban.banstr, 1); /* let it free banstr */
533 *lp_p = lp->next; /* clip out of list */
534 MyFree(lp->value.ban.who); /* free who */
535 free_link(lp); /* free ban */
537 } else if (lp->flags & CHFL_BURST_BAN) /* add ban to channel */
538 modebuf_mode_string(mbuf, MODE_ADD | MODE_BAN,
539 lp->value.ban.banstr, 0); /* don't free banstr */
541 lp->flags &= (CHFL_BAN | CHFL_BAN_IPMASK); /* reset the flag */
542 lp_p = &(*lp_p)->next;
546 return mbuf ? modebuf_flush(mbuf) : 0;