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"
101 #include "ircd_snprintf.h"
109 netride_modes(int parc, char **parv, const char *curr_key)
111 char *modes = parv[0];
114 assert(modes && modes[0] == '+');
118 result |= MODE_INVITEONLY;
121 if (strcmp(curr_key, *++parv))
128 result |= MODE_REGONLY;
136 * ms_burst - server message handler
138 * -- by Run carlo@runaway.xs4all.nl december 1995 till march 1997
140 * parv[0] = sender prefix
141 * parv[1] = channel name
142 * parv[2] = channel timestamp
143 * The meaning of the following parv[]'s depend on their first character:
144 * If parv[n] starts with a '+':
145 * Net burst, additive modes
147 * parv[n+1] = <param> (optional)
148 * parv[n+2] = <param> (optional)
149 * If parv[n] starts with a '%', then n will be parc-1:
150 * parv[n] = %<ban> <ban> <ban> ...
151 * If parv[n] starts with another character:
152 * parv[n] = <nick>[:<mode>],<nick>[:<mode>],...
153 * where <mode> defines the mode and op-level
154 * for nick and all following nicks until the
156 * Digits in the <mode> field have of two meanings:
157 * 1) if it is the first field in this BURST message
158 * that contains digits, and/or when a 'v' is
159 * present in the <mode>:
160 * The absolute value of the op-level.
161 * 2) if there are only digits in this field and
162 * it is not the first field with digits:
163 * An op-level increment relative to the previous
165 * First all modeless nicks must be emmitted,
166 * then all combinations of modes without ops
167 * (currently that is only 'v') followed by the same
168 * series but then with ops (currently 'o','ov').
171 * "A8 B #test 87654321 +ntkAl key secret 123 A8AAG,A8AAC:v,A8AAA:0,A8AAF:2,A8AAD,A8AAB:v1,A8AAE:1 :%ban1 ban2"
173 * <mode> list example:
175 * "xxx,sss:v,ttt,aaa:123,bbb,ccc:2,ddd,kkk:v2,lll:2,mmm"
179 * xxx // first modeless nicks
180 * sss +v // then opless nicks
181 * ttt +v // no ":<mode>": everything stays the same
182 * aaa -123 // first field with digit: absolute value
184 * ccc -125 // only digits, not first field: increment
186 * kkk -2 +v // field with a 'v': absolute value
187 * lll -4 +v // only digits: increment
190 * Anti net.ride code.
192 * When the channel already exist, and its TS is larger than
193 * the TS in the BURST message, then we cancel all existing modes.
194 * If its is smaller then the received BURST message is ignored.
195 * If it's equal, then the received modes are just added.
197 * BURST is also accepted outside a netburst now because it
198 * is sent upstream as reaction to a DESTRUCT message. For
199 * these BURST messages it is possible that the listed channel
200 * members are already joined.
202 int ms_burst(struct Client *cptr, struct Client *sptr, int parc, char *parv[])
204 struct ModeBuf modebuf, *mbuf = 0;
205 struct Channel *chptr;
207 struct Membership *member, *nmember;
208 struct Ban *lp, **lp_p;
209 unsigned int parse_flags = (MODE_PARSE_FORCE | MODE_PARSE_BURST);
210 int param, nickpos = 0, banpos = 0;
211 char modestr[BUFSIZE], nickstr[BUFSIZE], banstr[BUFSIZE];
214 return protocol_violation(sptr,"Too few parameters for BURST");
216 if (!(chptr = get_channel(sptr, parv[1], CGT_CREATE)))
217 return 0; /* can't create the channel? */
219 timestamp = atoi(parv[2]);
221 if (!chptr->creationtime || chptr->creationtime > timestamp) {
223 * Kick local members if channel is +i or +k and our TS was larger
224 * than the burst TS (anti net.ride). The modes hack is here because
225 * we have to do this before mode_parse, as chptr may go away.
227 for (param = 3; param < parc; param++)
230 if (parv[param][0] != '+')
232 check_modes = netride_modes(parc - param, parv + param, chptr->mode.key);
235 /* Clear any outstanding rogue invites */
236 mode_invite_clear(chptr);
237 for (member = chptr->members; member; member = nmember)
239 nmember = member->next_member;
240 if (!MyUser(member->user) || IsZombie(member))
242 /* Kick as netrider if key mismatch *or* remote channel is
243 * +i (unless user is an oper) *or* remote channel is +r
244 * (unless user has an account).
246 if (!(check_modes & MODE_KEY)
247 && (!(check_modes & MODE_INVITEONLY) || IsAnOper(member->user))
248 && (!(check_modes & MODE_REGONLY) || IsAccount(member->user)))
250 sendcmdto_serv_butone(&me, CMD_KICK, NULL, "%H %C :Net Rider", chptr, member->user);
251 sendcmdto_channel_butserv_butone(&me, CMD_KICK, chptr, NULL, 0, "%H %C :Net Rider", chptr, member->user);
252 make_zombie(member, member->user, &me, &me, chptr);
258 /* If the channel had only locals, it went away by now. */
259 if (!(chptr = get_channel(sptr, parv[1], CGT_CREATE)))
260 return 0; /* can't create the channel? */
263 /* turn off burst joined flag */
264 for (member = chptr->members; member; member = member->next_member)
265 member->status &= ~(CHFL_BURST_JOINED|CHFL_BURST_ALREADY_OPPED|CHFL_BURST_ALREADY_VOICED);
267 if (!chptr->creationtime) /* mark channel as created during BURST */
268 chptr->mode.mode |= MODE_BURSTADDED;
270 /* new channel or an older one */
271 if (!chptr->creationtime || chptr->creationtime > timestamp) {
272 chptr->creationtime = timestamp;
274 modebuf_init(mbuf = &modebuf, &me, cptr, chptr,
275 MODEBUF_DEST_CHANNEL | MODEBUF_DEST_NOKEY);
276 modebuf_mode(mbuf, MODE_DEL | chptr->mode.mode); /* wipeout modes */
277 chptr->mode.mode &= MODE_BURSTADDED | MODE_WASDELJOINS;
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;
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->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->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->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_ban(ban); /* create new ban */
354 DupString(newban->who,
355 cli_name(feature_bool(FEAT_HIS_BANWHO) ? &me : sptr));
356 newban->when = TStime();
358 newban->flags = CHFL_BAN | CHFL_BURST_BAN; /* set flags */
359 if ((ptr = strrchr(ban, '@')) && check_if_ipmask(ptr + 1))
360 newban->flags |= CHFL_BAN_IPMASK;
364 lp->next = newban; /* link it in */
366 chptr->banlist = newban;
370 param++; /* look at next param */
373 default: /* parameter contains clients */
375 struct Client *acptr;
376 char *nicklist = parv[param], *p = 0, *nick, *ptr;
377 int current_mode, last_mode, base_mode;
378 int oplevel = -1; /* Mark first field with digits: means the same as 'o' (but with level). */
379 int last_oplevel = 0;
380 struct Membership* member;
382 base_mode = CHFL_DEOPPED | CHFL_BURST_JOINED;
383 if (chptr->mode.mode & MODE_DELJOINS)
384 base_mode |= CHFL_DELAYED;
385 current_mode = last_mode = base_mode;
387 for (nick = ircd_strtok(&p, nicklist, ","); nick;
388 nick = ircd_strtok(&p, 0, ",")) {
390 if ((ptr = strchr(nick, ':'))) { /* new flags; deal */
393 if (parse_flags & MODE_PARSE_SET) {
394 int current_mode_needs_reset;
395 for (current_mode_needs_reset = 1; *ptr; ptr++) {
396 if (*ptr == 'o') { /* has oper status */
398 * An 'o' is pre-oplevel protocol, so this is only for
399 * backwards compatibility. Give them an op-level of
400 * MAXOPLEVEL so everyone can deop them.
402 oplevel = MAXOPLEVEL;
403 if (current_mode_needs_reset) {
404 current_mode = base_mode;
405 current_mode_needs_reset = 0;
407 current_mode = (current_mode & ~(CHFL_DEOPPED | CHFL_DELAYED)) | CHFL_CHANOP;
409 else if (*ptr == 'v') { /* has voice status */
410 if (current_mode_needs_reset) {
411 current_mode = base_mode;
412 current_mode_needs_reset = 0;
414 current_mode = (current_mode & ~CHFL_DELAYED) | CHFL_VOICE;
415 oplevel = -1; /* subsequential digits are an absolute op-level value. */
417 else if (isdigit(*ptr)) {
418 int level_increment = 0;
419 if (oplevel == -1) { /* op-level is absolute value? */
420 if (current_mode_needs_reset) {
421 current_mode = base_mode;
422 current_mode_needs_reset = 0;
426 current_mode = (current_mode & ~(CHFL_DEOPPED | CHFL_DELAYED)) | CHFL_CHANOP;
428 level_increment = 10 * level_increment + *ptr++ - '0';
429 } while(isdigit(*ptr));
430 oplevel += level_increment;
432 else /* I don't recognize that flag */
433 break; /* so stop processing */
438 if (!(acptr = findNUser(nick)) || cli_from(acptr) != cptr)
439 continue; /* ignore this client */
441 /* Build nick buffer */
442 nickstr[nickpos] = nickpos ? ',' : ' '; /* first char */
445 for (ptr = nick; *ptr; ptr++) /* store nick */
446 nickstr[nickpos++] = *ptr;
448 if (current_mode != last_mode) { /* if mode changed... */
449 last_mode = current_mode;
450 last_oplevel = oplevel;
452 nickstr[nickpos++] = ':'; /* add a specifier */
453 if (current_mode & CHFL_VOICE)
454 nickstr[nickpos++] = 'v';
455 if (current_mode & CHFL_CHANOP)
456 nickpos += ircd_snprintf(0, nickstr + nickpos, sizeof(nickstr) - nickpos, "%u", oplevel);
457 } else if (current_mode & CHFL_CHANOP && oplevel != last_oplevel) { /* if just op level changed... */
458 nickstr[nickpos++] = ':'; /* add a specifier */
459 nickpos += ircd_snprintf(0, nickstr + nickpos, sizeof(nickstr) - nickpos, "%u", oplevel - last_oplevel);
460 last_oplevel = oplevel;
463 if (IsBurst(sptr) || !(member = find_member_link(chptr, acptr)))
465 add_user_to_channel(chptr, acptr, current_mode, oplevel);
466 if (!(current_mode & CHFL_DELAYED))
467 sendcmdto_channel_butserv_butone(acptr, CMD_JOIN, chptr, NULL, 0, "%H", chptr);
471 /* The member was already joined (either by CREATE or JOIN).
472 Remember the current mode. */
473 if (member->status & CHFL_CHANOP)
474 member->status |= CHFL_BURST_ALREADY_OPPED;
475 if (member->status & CHFL_VOICE)
476 member->status |= CHFL_BURST_ALREADY_VOICED;
477 /* Synchronize with the burst. */
478 member->status |= CHFL_BURST_JOINED | (current_mode & (CHFL_CHANOP|CHFL_VOICE));
479 member->oplevel = oplevel;
485 } /* switch (*parv[param]) */
486 } /* while (param < parc) */
488 nickstr[nickpos] = '\0';
489 banstr[banpos] = '\0';
491 if (parse_flags & MODE_PARSE_SET) {
492 modebuf_extract(mbuf, modestr + 1); /* for sending BURST onward */
493 modestr[0] = modestr[1] ? ' ' : '\0';
497 sendcmdto_serv_butone(sptr, CMD_BURST, cptr, "%H %Tu%s%s%s", chptr,
498 chptr->creationtime, modestr, nickstr, banstr);
500 if (parse_flags & MODE_PARSE_WIPEOUT || banpos)
501 mode_ban_invalidate(chptr);
503 if (parse_flags & MODE_PARSE_SET) { /* any modes changed? */
504 /* first deal with channel members */
505 for (member = chptr->members; member; member = member->next_member) {
506 if (member->status & CHFL_BURST_JOINED) { /* joined during burst */
507 if ((member->status & CHFL_CHANOP) && !(member->status & CHFL_BURST_ALREADY_OPPED))
508 modebuf_mode_client(mbuf, MODE_ADD | CHFL_CHANOP, member->user);
509 if ((member->status & CHFL_VOICE) && !(member->status & CHFL_BURST_ALREADY_VOICED))
510 modebuf_mode_client(mbuf, MODE_ADD | CHFL_VOICE, member->user);
511 } else if (parse_flags & MODE_PARSE_WIPEOUT) { /* wipeout old ops */
512 if (member->status & CHFL_CHANOP)
513 modebuf_mode_client(mbuf, MODE_DEL | CHFL_CHANOP, member->user);
514 if (member->status & CHFL_VOICE)
515 modebuf_mode_client(mbuf, MODE_DEL | CHFL_VOICE, member->user);
516 member->status = ((member->status & ~(CHFL_CHANOP | CHFL_VOICE)) |
521 /* Now deal with channel bans */
522 lp_p = &chptr->banlist;
526 /* remove ban from channel */
527 if (lp->flags & (CHFL_BAN_OVERLAPPED | CHFL_BURST_BAN_WIPEOUT)) {
528 modebuf_mode_string(mbuf, MODE_DEL | MODE_BAN,
529 lp->banstr, 1); /* let it free banstr */
530 lp->banstr = NULL; /* do not free this string */
531 *lp_p = lp->next; /* clip out of list */
534 } else if (lp->flags & CHFL_BURST_BAN) /* add ban to channel */
535 modebuf_mode_string(mbuf, MODE_ADD | MODE_BAN,
536 lp->banstr, 0); /* don't free banstr */
538 lp->flags &= (CHFL_BAN | CHFL_BAN_IPMASK); /* reset the flag */
539 lp_p = &(*lp_p)->next;
543 return mbuf ? modebuf_flush(mbuf) : 0;