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_policy.h"
90 #include "ircd_reply.h"
91 #include "ircd_string.h"
102 #include "ircd_snprintf.h"
110 * ms_burst - server message handler
112 * -- by Run carlo@runaway.xs4all.nl december 1995 till march 1997
114 * parv[0] = sender prefix
115 * parv[1] = channel name
116 * parv[2] = channel timestamp
117 * The meaning of the following parv[]'s depend on their first character:
118 * If parv[n] starts with a '+':
119 * Net burst, additive modes
121 * parv[n+1] = <param> (optional)
122 * parv[n+2] = <param> (optional)
123 * If parv[n] starts with a '%', then n will be parc-1:
124 * parv[n] = %<ban> <ban> <ban> ...
125 * If parv[n] starts with another character:
126 * parv[n] = <nick>[:<mode>],<nick>[:<mode>],...
127 * where <mode> defines the mode and op-level
128 * for nick and all following nicks until the
130 * Digits in the <mode> field have of two meanings:
131 * 1) if it is the first field in this BURST message
132 * that contains digits, and/or when a 'v' is
133 * present in the <mode>:
134 * The absolute value of the op-level.
135 * 2) if there are only digits in this field and
136 * it is not the first field with digits:
137 * An op-level increment relative to the previous
139 * First all modeless nicks must be emmitted,
140 * then all combinations of modes without ops
141 * (currently that is only 'v') followed by the same
142 * series but then with ops (currently 'o','ov').
145 * "A8 B #test 87654321 +ntkAl key secret 123 A8AAG,A8AAC:v,A8AAA:0,A8AAF:2,A8AAD,A8AAB:v1,A8AAE:1 :%ban1 ban2"
147 * <mode> list example:
149 * "xxx,sss:v,ttt,aaa:123,bbb,ccc:2,ddd,kkk:v2,lll:2,mmm"
153 * xxx // first modeless nicks
154 * sss +v // then opless nicks
155 * ttt +v // no ":<mode>": everything stays the same
156 * aaa -123 // first field with digit: absolute value
158 * ccc -125 // only digits, not first field: increment
160 * kkk -2 +v // field with a 'v': absolute value
161 * lll -4 +v // only digits: increment
164 * Anti net.ride code.
166 * When the channel already exist, and its TS is larger than
167 * the TS in the BURST message, then we cancel all existing modes.
168 * If its is smaller then the received BURST message is ignored.
169 * If it's equal, then the received modes are just added.
171 int ms_burst(struct Client *cptr, struct Client *sptr, int parc, char *parv[])
173 struct ModeBuf modebuf, *mbuf = 0;
174 struct Channel *chptr;
176 struct Membership *member;
177 struct SLink *lp, **lp_p;
178 unsigned int parse_flags = (MODE_PARSE_FORCE | MODE_PARSE_BURST);
179 int param, nickpos = 0, banpos = 0;
180 char modestr[BUFSIZE], nickstr[BUFSIZE], banstr[BUFSIZE];
183 return protocol_violation(sptr,"Too few parameters for BURST");
185 if (!IsBurst(sptr)) /* don't allow BURST outside of burst */
186 return exit_client_msg(cptr, cptr, &me, "HACK: BURST message outside "
187 "net.burst from %s", cli_name(sptr));
189 if (!(chptr = get_channel(sptr, parv[1], CGT_CREATE)))
190 return 0; /* can't create the channel? */
192 timestamp = atoi(parv[2]);
194 /* turn off burst joined flag */
195 for (member = chptr->members; member; member = member->next_member)
196 member->status &= ~CHFL_BURST_JOINED;
198 if (!chptr->creationtime) /* mark channel as created during BURST */
199 chptr->mode.mode |= MODE_BURSTADDED;
201 /* new channel or an older one */
202 if (!chptr->creationtime || chptr->creationtime > timestamp) {
203 chptr->creationtime = timestamp;
205 modebuf_init(mbuf = &modebuf, &me, cptr, chptr, MODEBUF_DEST_CHANNEL);
206 modebuf_mode(mbuf, MODE_DEL | chptr->mode.mode); /* wipeout modes */
207 chptr->mode.mode &= ~(MODE_ADD | MODE_DEL | MODE_PRIVATE | MODE_SECRET |
208 MODE_MODERATED | MODE_TOPICLIMIT | MODE_INVITEONLY |
211 parse_flags |= (MODE_PARSE_SET | MODE_PARSE_WIPEOUT); /* wipeout keys */
213 /* mark bans for wipeout */
214 for (lp = chptr->banlist; lp; lp = lp->next)
215 lp->flags |= CHFL_BURST_BAN_WIPEOUT;
216 } else if (chptr->creationtime == timestamp) {
217 modebuf_init(mbuf = &modebuf, &me, cptr, chptr, MODEBUF_DEST_CHANNEL);
219 parse_flags |= MODE_PARSE_SET; /* set new modes */
222 param = 3; /* parse parameters */
223 while (param < parc) {
224 switch (*parv[param]) {
225 case '+': /* parameter introduces a mode string */
226 param += mode_parse(mbuf, cptr, sptr, chptr, parc - param,
227 parv + param, parse_flags, NULL);
230 case '%': /* parameter contains bans */
231 if (parse_flags & MODE_PARSE_SET) {
232 char *banlist = parv[param] + 1, *p = 0, *ban, *ptr;
233 struct SLink *newban;
235 for (ban = ircd_strtok(&p, banlist, " "); ban;
236 ban = ircd_strtok(&p, 0, " ")) {
237 ban = collapse(pretty_mask(ban));
240 * Yeah, we should probably do this elsewhere, and make it better
241 * and more general; this will hold until we get there, though.
242 * I dislike the current add_banid API... -Kev
244 * I wish there were a better algo. for this than the n^2 one
247 for (lp = chptr->banlist; lp; lp = lp->next) {
248 if (!ircd_strcmp(lp->value.ban.banstr, ban)) {
249 ban = 0; /* don't add ban */
250 lp->flags &= ~CHFL_BURST_BAN_WIPEOUT; /* not wiping out */
251 break; /* new ban already existed; don't even repropagate */
252 } else if (!(lp->flags & CHFL_BURST_BAN_WIPEOUT) &&
253 !mmatch(lp->value.ban.banstr, ban)) {
254 ban = 0; /* don't add ban unless wiping out bans */
255 break; /* new ban is encompassed by an existing one; drop */
256 } else if (!mmatch(ban, lp->value.ban.banstr))
257 lp->flags |= CHFL_BAN_OVERLAPPED; /* remove overlapping ban */
263 if (ban) { /* add the new ban to the end of the list */
264 /* Build ban buffer */
266 banstr[banpos++] = ' ';
267 banstr[banpos++] = ':';
268 banstr[banpos++] = '%';
270 banstr[banpos++] = ' ';
271 for (ptr = ban; *ptr; ptr++) /* add ban to buffer */
272 banstr[banpos++] = *ptr;
274 newban = make_link(); /* create new ban */
276 DupString(newban->value.ban.banstr, ban);
277 #ifdef HEAD_IN_SAND_BANWHO
278 DupString(newban->value.ban.who, cli_name(&me));
280 DupString(newban->value.ban.who, cli_name(sptr));
282 newban->value.ban.when = TStime();
284 newban->flags = CHFL_BAN | CHFL_BURST_BAN; /* set flags */
285 if ((ptr = strrchr(ban, '@')) && check_if_ipmask(ptr + 1))
286 newban->flags |= CHFL_BAN_IPMASK;
290 lp->next = newban; /* link it in */
292 chptr->banlist = newban;
296 param++; /* look at next param */
299 default: /* parameter contains clients */
301 struct Client *acptr;
302 char *nicklist = parv[param], *p = 0, *nick, *ptr;
303 int current_mode = CHFL_DEOPPED | CHFL_BURST_JOINED;
304 int last_mode = CHFL_DEOPPED | CHFL_BURST_JOINED;
305 int oplevel = -1; /* Mark first field with digits: means the same as 'o' (but with level). */
306 int last_oplevel = 0;
308 for (nick = ircd_strtok(&p, nicklist, ","); nick;
309 nick = ircd_strtok(&p, 0, ",")) {
311 if ((ptr = strchr(nick, ':'))) { /* new flags; deal */
314 if (parse_flags & MODE_PARSE_SET) {
315 int current_mode_needs_reset;
316 for (current_mode_needs_reset = 1; *ptr; ptr++) {
317 if (*ptr == 'o') { /* has oper status */
319 * An 'o' is pre-oplevel protocol, so this is only for
320 * backwards compatibility. Give them an op-level of
321 * MAXOPLEVEL so everyone can deop them.
323 oplevel = MAXOPLEVEL;
324 if (current_mode_needs_reset) {
325 current_mode = CHFL_DEOPPED | CHFL_BURST_JOINED;
326 current_mode_needs_reset = 0;
328 current_mode = (current_mode & ~CHFL_DEOPPED) | CHFL_CHANOP;
330 else if (*ptr == 'v') { /* has voice status */
331 if (current_mode_needs_reset) {
332 current_mode = CHFL_DEOPPED | CHFL_BURST_JOINED;
333 current_mode_needs_reset = 0;
335 current_mode |= CHFL_VOICE;
336 oplevel = -1; /* subsequential digits are an absolute op-level value. */
338 else if (isdigit(*ptr)) {
339 int level_increment = 0;
340 if (oplevel == -1) { /* op-level is absolute value? */
341 if (current_mode_needs_reset) {
342 current_mode = CHFL_DEOPPED | CHFL_BURST_JOINED;
343 current_mode_needs_reset = 0;
347 current_mode = (current_mode & ~CHFL_DEOPPED) | CHFL_CHANOP;
349 level_increment = 10 * level_increment + *ptr++ - '0';
350 } while(isdigit(*ptr));
351 oplevel += level_increment;
353 else /* I don't recognize that flag */
354 break; /* so stop processing */
359 if (!(acptr = findNUser(nick)) || cli_from(acptr) != cptr)
360 continue; /* ignore this client */
362 /* Build nick buffer */
363 nickstr[nickpos] = nickpos ? ',' : ' '; /* first char */
366 for (ptr = nick; *ptr; ptr++) /* store nick */
367 nickstr[nickpos++] = *ptr;
369 if (current_mode != last_mode) { /* if mode changed... */
370 last_mode = current_mode;
371 last_oplevel = oplevel;
373 nickstr[nickpos++] = ':'; /* add a specifier */
374 if (current_mode & CHFL_VOICE)
375 nickstr[nickpos++] = 'v';
376 if (current_mode & CHFL_CHANOP)
377 nickpos += ircd_snprintf(0, nickstr + nickpos, sizeof(nickstr) - nickpos, "%u", oplevel);
378 } else if (current_mode & CHFL_CHANOP && oplevel != last_oplevel) { /* if just op level changed... */
379 nickstr[nickpos++] = ':'; /* add a specifier */
380 nickpos += ircd_snprintf(0, nickstr + nickpos, sizeof(nickstr) - nickpos, "%u", oplevel - last_oplevel);
381 last_oplevel = oplevel;
384 add_user_to_channel(chptr, acptr, current_mode, oplevel);
385 sendcmdto_channel_butserv_butone(acptr, CMD_JOIN, chptr, NULL, "%H", chptr);
390 } /* switch (*parv[param]) { */
391 } /* while (param < parc) { */
393 nickstr[nickpos] = '\0';
394 banstr[banpos] = '\0';
396 if (parse_flags & MODE_PARSE_SET) {
397 modebuf_extract(mbuf, modestr + 1); /* for sending BURST onward */
398 modestr[0] = modestr[1] ? ' ' : '\0';
402 sendcmdto_serv_butone(sptr, CMD_BURST, cptr, "%H %Tu%s%s%s", chptr,
403 chptr->creationtime, modestr, nickstr, banstr);
405 if (parse_flags & MODE_PARSE_WIPEOUT || banpos)
406 mode_ban_invalidate(chptr);
408 if (parse_flags & MODE_PARSE_SET) { /* any modes changed? */
409 /* first deal with channel members */
410 for (member = chptr->members; member; member = member->next_member) {
411 if (member->status & CHFL_BURST_JOINED) { /* joined during burst */
412 if (member->status & CHFL_CHANOP)
413 modebuf_mode_client(mbuf, MODE_ADD | CHFL_CHANOP, member->user);
414 if (member->status & CHFL_VOICE)
415 modebuf_mode_client(mbuf, MODE_ADD | CHFL_VOICE, member->user);
416 } else if (parse_flags & MODE_PARSE_WIPEOUT) { /* wipeout old ops */
417 if (member->status & CHFL_CHANOP)
418 modebuf_mode_client(mbuf, MODE_DEL | CHFL_CHANOP, member->user);
419 if (member->status & CHFL_VOICE)
420 modebuf_mode_client(mbuf, MODE_DEL | CHFL_VOICE, member->user);
421 member->status = ((member->status & ~(CHFL_CHANOP | CHFL_VOICE)) |
426 /* Now deal with channel bans */
427 lp_p = &chptr->banlist;
431 /* remove ban from channel */
432 if (lp->flags & (CHFL_BAN_OVERLAPPED | CHFL_BURST_BAN_WIPEOUT)) {
433 modebuf_mode_string(mbuf, MODE_DEL | MODE_BAN,
434 lp->value.ban.banstr, 1); /* let it free banstr */
436 *lp_p = lp->next; /* clip out of list */
437 MyFree(lp->value.ban.who); /* free who */
438 free_link(lp); /* free ban */
440 } else if (lp->flags & CHFL_BURST_BAN) /* add ban to channel */
441 modebuf_mode_string(mbuf, MODE_ADD | MODE_BAN,
442 lp->value.ban.banstr, 0); /* don't free banstr */
444 lp->flags &= (CHFL_BAN | CHFL_BAN_IPMASK); /* reset the flag */
445 lp_p = &(*lp_p)->next;
449 return mbuf ? modebuf_flush(mbuf) : 0;