/** Handle a JOIN message from a server connection.
* See @ref m_functions for discussion of the arguments.
* @param[in] cptr Client that sent us the message.
* @param[in] sptr Original source of message.
* @param[in] parc Number of arguments.
* @param[in] parv Argument vector.
*/
int ms_join(struct Client *cptr, struct Client *sptr, int parc, char *parv[])
{
struct Membership *member;
struct Channel *chptr;
struct JoinBuf join;
unsigned int flags;
time_t creation = 0;
char *p = 0;
char *chanlist;
char *name;
if (IsServer(sptr))
{
return protocol_violation(cptr,
"%s tried to JOIN %s, duh!",
cli_name(sptr),
(parc < 2 || *parv[1] == '\0') ? "a channel" :
parv[1]
);
}
if (parc < 2 || *parv[1] == '\0')
return need_more_params(sptr, "JOIN");
if (parc > 2 && parv[2])
creation = atoi(parv[2]);
joinbuf_init(&join, sptr, cptr, JOINBUF_TYPE_JOIN, 0, 0);
chanlist = last0(cptr, sptr, parv[1]); /* find last "JOIN 0" */
for (name = ircd_strtok(&p, chanlist, ","); name;
name = ircd_strtok(&p, 0, ",")) {
flags = CHFL_DEOPPED;
if (IsLocalChannel(name) || !IsChannelName(name))
{
protocol_violation(cptr, "%s tried to join %s", cli_name(sptr), name);
continue;
}
if (!(chptr = FindChannel(name)))
{
/* No channel exists, so create one */
if (!(chptr = get_channel(sptr, name, CGT_CREATE)))
{
protocol_violation(sptr,"couldn't get channel %s for %s",
name,cli_name(sptr));
continue;
}
flags |= HasFlag(sptr, FLAG_TS8) ? CHFL_SERVOPOK : 0;
chptr->creationtime = creation;
}
else { /* We have a valid channel? */
if ((member = find_member_link(chptr, sptr)))
{
/* It is impossible to get here --Run */
if (!IsZombie(member)) /* already on channel */
continue;
flags = member->status & (CHFL_DEOPPED | CHFL_SERVOPOK);
remove_user_from_channel(sptr, chptr);
chptr = FindChannel(name);
}
else
flags |= HasFlag(sptr, FLAG_TS8) ? CHFL_SERVOPOK : 0;
/* Always copy the timestamp when it is older, that is the only way to
ensure network-wide synchronization of creation times.
We now also copy a creation time that only 1 second younger...
this is needed because the timestamp must be incremented
by one when someone joins an existing, but empty, channel.
However, this is only necessary when the channel is still
empty (also here) and when this channel doesn't have +A set.
To prevent this from allowing net-rides on the channel, we
clear all modes from the channel.
(Scenario for a net ride: c1 - s1 - s2 - c2, with c1 the only
user in the channel; c1 parts and rejoins, gaining ops.
Before s2 sees c1's part, c2 joins the channel and parts
immediately. s1 sees c1 part, c1 create, c2 join, c2 part;
c2's join resets the timestamp. s2 sees c2 join, c2 part, c1
part, c1 create; but since s2 sees the channel as a zannel or
non-existent, it does not bounce the create with the newer
timestamp.)
*/
if (creation && (creation < chptr->creationtime ||
(!chptr->mode.apass[0] && chptr->users == 0))) {
struct Membership *member;
struct ModeBuf mbuf;
chptr->creationtime = creation;
/* Wipe out the current modes on the channel. */
modebuf_init(&mbuf, sptr, cptr, chptr, MODEBUF_DEST_CHANNEL | MODEBUF_DEST_HACK3);
modebuf_mode(&mbuf, MODE_DEL | chptr->mode.mode);
chptr->mode.mode &= MODE_BURSTADDED | MODE_WASDELJOINS;
if (chptr->mode.limit) {
modebuf_mode_uint(&mbuf, MODE_DEL | MODE_LIMIT, chptr->mode.limit);
chptr->mode.limit = 0;
}
if (chptr->mode.key[0]) {
modebuf_mode_string(&mbuf, MODE_DEL | MODE_KEY, chptr->mode.key, 0);
chptr->mode.key[0] = '\0';
}
if (chptr->mode.upass[0]) {
modebuf_mode_string(&mbuf, MODE_DEL | MODE_UPASS, chptr->mode.upass, 0);
chptr->mode.upass[0] = '\0';
}
if (chptr->mode.apass[0]) {
modebuf_mode_string(&mbuf, MODE_DEL | MODE_APASS, chptr->mode.apass, 0);
chptr->mode.apass[0] = '\0';
}
for (member = chptr->members; member; member = member->next_member)
{
if (IsChanOp(member)) {
modebuf_mode_client(&mbuf, MODE_DEL | MODE_CHANOP, member->user, OpLevel(member));
member->status &= ~CHFL_CHANOP;
}
if (HasVoice(member)) {
modebuf_mode_client(&mbuf, MODE_DEL | MODE_VOICE, member->user, OpLevel(member));
member->status &= ~CHFL_VOICE;
}
}
modebuf_flush(&mbuf);
}
}
joinbuf_join(&join, chptr, flags);
}
joinbuf_flush(&join); /* flush joins... */
return 0;
}
/* * ms_burst - server message handler * * -- by Run [email protected] december 1995 till march 1997 * * parv[0] = sender prefix * parv[1] = channel name * parv[2] = channel timestamp * The meaning of the following parv[]'s depend on their first character: * If parv[n] starts with a '+': * Net burst, additive modes * parv[n] = <mode> * parv[n+1] = <param> (optional) * parv[n+2] = <param> (optional) * If parv[n] starts with a '%', then n will be parc-1: * parv[n] = %<ban> <ban> <ban> ... * If parv[n] starts with another character: * parv[n] = <nick>[:<mode>],<nick>[:<mode>],... * where <mode> defines the mode and op-level * for nick and all following nicks until the * next <mode> field. * Digits in the <mode> field have of two meanings: * 1) if it is the first field in this BURST message * that contains digits, and/or when a 'v' is * present in the <mode>: * The absolute value of the op-level. * 2) if there are only digits in this field and * it is not the first field with digits: * An op-level increment relative to the previous * op-level. * First all modeless nicks must be emmitted, * then all combinations of modes without ops * (currently that is only 'v') followed by the same * series but then with ops (currently 'o','ov'). * * Example: * "A8 B #test 87654321 +ntkAl key secret 123 A8AAG,A8AAC:v,A8AAA:0,A8AAF:2,A8AAD,A8AAB:v1,A8AAE:1 :%ban1 ban2" * * <mode> list example: * * "xxx,sss:v,ttt,aaa:123,bbb,ccc:2,ddd,kkk:v2,lll:2,mmm" * * means * * xxx // first modeless nicks * sss +v // then opless nicks * ttt +v // no ":<mode>": everything stays the same * aaa -123 // first field with digit: absolute value * bbb -123 * ccc -125 // only digits, not first field: increment * ddd -125 * kkk -2 +v // field with a 'v': absolute value * lll -4 +v // only digits: increment * mmm -4 +v * * Anti net.ride code. * * When the channel already exist, and its TS is larger than * the TS in the BURST message, then we cancel all existing modes. * If its is smaller then the received BURST message is ignored. * If it's equal, then the received modes are just added. * * BURST is also accepted outside a netburst now because it * is sent upstream as reaction to a DESTRUCT message. For * these BURST messages it is possible that the listed channel * members are already joined. */ int ms_burst(struct Client *cptr, struct Client *sptr, int parc, char *parv[]) { struct ModeBuf modebuf, *mbuf = 0; struct Channel *chptr; time_t timestamp; struct Membership *member, *nmember; struct Ban *lp, **lp_p; unsigned int parse_flags = (MODE_PARSE_FORCE | MODE_PARSE_BURST); int param, nickpos = 0, banpos = 0; char modestr[BUFSIZE], nickstr[BUFSIZE], banstr[BUFSIZE]; if (parc < 3) return protocol_violation(sptr,"Too few parameters for BURST"); if (!(chptr = get_channel(sptr, parv[1], CGT_CREATE))) return 0; /* can't create the channel? */ timestamp = atoi(parv[2]); if (chptr->creationtime) /* 0 for new (empty) channels, i.e. when this server just restarted. */ { if (parc == 3) /* Zannel BURST? */ { /* An empty channel without +A set, will cause a BURST message with exactly 3 parameters (because all modes have been reset). If the timestamp on such channels is only a few seconds older from our own, then we ignore this burst: we do not deop our own side. Likewise, we expect the other (empty) side to copy our timestamp from our own BURST message, even though it is slightly larger. The reason for this is to allow people to join an empty non-A channel (a zannel) during a net.split, and not be deopped when the net reconnects (with another zannel). When someone joins a split zannel, their side increments the TS by one. If they cycle a few times then we still don't have a reason to deop them. Theoretically I see no reason not to accept ANY timestamp, but to be sure, we only accept timestamps that are just a few seconds off (one second for each time they cycled the channel). */ /* Don't even deop users who cycled four times during the net.break. */ if (timestamp < chptr->creationtime && chptr->creationtime <= timestamp + 4 && chptr->users != 0) /* Only do this when WE have users, so that if we do this the BURST that we sent has parc > 3 and the other side will use the test below: */ timestamp = chptr->creationtime; /* Do not deop our side. */ } else if (chptr->creationtime < timestamp && timestamp <= chptr->creationtime + 4 && chptr->users == 0) { /* If one side of the net.junction does the above timestamp = chptr->creationtime, then the other side must do this: */ chptr->creationtime = timestamp; /* Use the same TS on both sides. */ } /* In more complex cases, we might still end up with a creationtime desync of a few seconds, but that should be synced automatically rather quickly (every JOIN caries a timestamp and will sync it; modes by users do not carry timestamps and are accepted regardless). Only when nobody joins the channel on the side with the oldest timestamp before a new net.break occurs precisely inbetween the desync, an unexpected bounce might happen on reconnect. */ } if (!chptr->creationtime || chptr->creationtime > timestamp) { /* * Kick local members if channel is +i or +k and our TS was larger * than the burst TS (anti net.ride). The modes hack is here because * we have to do this before mode_parse, as chptr may go away. */ for (param = 3; param < parc; param++) { int check_modes; if (parv[param][0] != '+') continue; check_modes = netride_modes(parc - param, parv + param, chptr->mode.key); if (check_modes < 0) { if (chptr->users == 0) sub1_from_channel(chptr); return protocol_violation(sptr, "Invalid mode string in BURST"); } else if (check_modes) { /* Clear any outstanding rogue invites */ mode_invite_clear(chptr); for (member = chptr->members; member; member = nmember) { nmember = member->next_member; if (!MyUser(member->user) || IsZombie(member)) continue; /* Kick as netrider if key mismatch *or* remote channel is * +i (unless user is an oper) *or* remote channel is +r * (unless user has an account). */ if (!(check_modes & MODE_KEY) && (!(check_modes & MODE_INVITEONLY) || IsAnOper(member->user)) && (!(check_modes & MODE_REGONLY) || IsAccount(member->user))) continue; sendcmdto_serv_butone(&me, CMD_KICK, NULL, "%H %C :Net Rider", chptr, member->user); sendcmdto_channel_butserv_butone(&his, CMD_KICK, chptr, NULL, 0, "%H %C :Net Rider", chptr, member->user); make_zombie(member, member->user, &me, &me, chptr); } } break; } /* If the channel had only locals, it went away by now. */ if (!(chptr = get_channel(sptr, parv[1], CGT_CREATE))) return 0; /* can't create the channel? */ } /* turn off burst joined flag */ for (member = chptr->members; member; member = member->next_member) member->status &= ~(CHFL_BURST_JOINED|CHFL_BURST_ALREADY_OPPED|CHFL_BURST_ALREADY_VOICED); if (!chptr->creationtime) /* mark channel as created during BURST */ chptr->mode.mode |= MODE_BURSTADDED; /* new channel or an older one */ if (!chptr->creationtime || chptr->creationtime > timestamp) { chptr->creationtime = timestamp; modebuf_init(mbuf = &modebuf, &me, cptr, chptr, MODEBUF_DEST_CHANNEL | MODEBUF_DEST_NOKEY); modebuf_mode(mbuf, MODE_DEL | chptr->mode.mode); /* wipeout modes */ chptr->mode.mode &= MODE_BURSTADDED | MODE_WASDELJOINS; /* wipe out modes not represented in chptr->mode.mode */ if (chptr->mode.limit) { modebuf_mode_uint(mbuf, MODE_DEL | MODE_LIMIT, chptr->mode.limit); chptr->mode.limit = 0; } if (chptr->mode.key[0]) { modebuf_mode_string(mbuf, MODE_DEL | MODE_KEY, chptr->mode.key, 0); chptr->mode.key[0] = '\0'; } if (chptr->mode.upass[0]) { modebuf_mode_string(mbuf, MODE_DEL | MODE_UPASS, chptr->mode.upass, 0); chptr->mode.upass[0] = '\0'; } if (chptr->mode.apass[0]) { modebuf_mode_string(mbuf, MODE_DEL | MODE_APASS, chptr->mode.apass, 0); chptr->mode.apass[0] = '\0'; } parse_flags |= (MODE_PARSE_SET | MODE_PARSE_WIPEOUT); /* wipeout keys */ /* mark bans for wipeout */ for (lp = chptr->banlist; lp; lp = lp->next) lp->flags |= BAN_BURST_WIPEOUT; /* clear topic set by netrider (if set) */ if (*chptr->topic) { *chptr->topic = '\0'; *chptr->topic_nick = '\0'; chptr->topic_time = 0; sendcmdto_channel_butserv_butone(&his, CMD_TOPIC, chptr, NULL, 0, "%H :%s", chptr, chptr->topic); } } else if (chptr->creationtime == timestamp) { modebuf_init(mbuf = &modebuf, &me, cptr, chptr, MODEBUF_DEST_CHANNEL | MODEBUF_DEST_NOKEY); parse_flags |= MODE_PARSE_SET; /* set new modes */ } param = 3; /* parse parameters */ while (param < parc) { switch (*parv[param]) { case '+': /* parameter introduces a mode string */ param += mode_parse(mbuf, cptr, sptr, chptr, parc - param, parv + param, parse_flags, NULL); break; case '%': /* parameter contains bans */ if (parse_flags & MODE_PARSE_SET) { char *banlist = parv[param] + 1, *p = 0, *ban, *ptr; struct Ban *newban; for (ban = ircd_strtok(&p, banlist, " "); ban; ban = ircd_strtok(&p, 0, " ")) { ban = collapse(pretty_mask(ban)); /* * Yeah, we should probably do this elsewhere, and make it better * and more general; this will hold until we get there, though. * I dislike the current add_banid API... -Kev * * I wish there were a better algo. for this than the n^2 one * shown below *sigh* */ for (lp = chptr->banlist; lp; lp = lp->next) { if (!ircd_strcmp(lp->banstr, ban)) { ban = 0; /* don't add ban */ lp->flags &= ~BAN_BURST_WIPEOUT; /* not wiping out */ break; /* new ban already existed; don't even repropagate */ } else if (!(lp->flags & BAN_BURST_WIPEOUT) && !mmatch(lp->banstr, ban)) { ban = 0; /* don't add ban unless wiping out bans */ break; /* new ban is encompassed by an existing one; drop */ } else if (!mmatch(ban, lp->banstr)) lp->flags |= BAN_OVERLAPPED; /* remove overlapping ban */ if (!lp->next) break; } if (ban) { /* add the new ban to the end of the list */ /* Build ban buffer */ if (!banpos) { banstr[banpos++] = ' '; banstr[banpos++] = ':'; banstr[banpos++] = '%'; } else banstr[banpos++] = ' '; for (ptr = ban; *ptr; ptr++) /* add ban to buffer */ banstr[banpos++] = *ptr; newban = make_ban(ban); /* create new ban */ strcpy(newban->who, "*"); newban->when = TStime(); newban->flags |= BAN_BURSTED; newban->next = 0; if (lp) lp->next = newban; /* link it in */ else chptr->banlist = newban; } } } param++; /* look at next param */ break; default: /* parameter contains clients */ { struct Client *acptr; char *nicklist = parv[param], *p = 0, *nick, *ptr; int current_mode, last_mode, base_mode; int oplevel = -1; /* Mark first field with digits: means the same as 'o' (but with level). */ int last_oplevel = 0; struct Membership* member; base_mode = CHFL_DEOPPED | CHFL_BURST_JOINED; if (chptr->mode.mode & MODE_DELJOINS) base_mode |= CHFL_DELAYED; current_mode = last_mode = base_mode; for (nick = ircd_strtok(&p, nicklist, ","); nick; nick = ircd_strtok(&p, 0, ",")) { if ((ptr = strchr(nick, ':'))) { /* new flags; deal */ *ptr++ = '\0'; if (parse_flags & MODE_PARSE_SET) { int current_mode_needs_reset; for (current_mode_needs_reset = 1; *ptr; ptr++) { if (*ptr == 'o') { /* has oper status */ /* * An 'o' is pre-oplevel protocol, so this is only for * backwards compatibility. Give them an op-level of * MAXOPLEVEL so everyone can deop them. */ oplevel = MAXOPLEVEL; if (current_mode_needs_reset) { current_mode = base_mode; current_mode_needs_reset = 0; } current_mode = (current_mode & ~(CHFL_DEOPPED | CHFL_DELAYED)) | CHFL_CHANOP; /* * Older servers may send XXYYY:ov, in which case we * do not want to use the code for 'v' below. */ if (ptr[1] == 'v') { current_mode |= CHFL_VOICE; ptr++; } } else if (*ptr == 'v') { /* has voice status */ if (current_mode_needs_reset) { current_mode = base_mode; current_mode_needs_reset = 0; } current_mode = (current_mode & ~CHFL_DELAYED) | CHFL_VOICE; oplevel = -1; /* subsequent digits are an absolute op-level value. */ } else if (IsDigit(*ptr)) { int level_increment = 0; if (oplevel == -1) { /* op-level is absolute value? */ if (current_mode_needs_reset) { current_mode = base_mode; current_mode_needs_reset = 0; } oplevel = 0; } current_mode = (current_mode & ~(CHFL_DEOPPED | CHFL_DELAYED)) | CHFL_CHANOP; do { level_increment = 10 * level_increment + *ptr++ - '0'; } while (IsDigit(*ptr)); oplevel += level_increment; } else /* I don't recognize that flag */ break; /* so stop processing */ } } } if (!(acptr = findNUser(nick)) || cli_from(acptr) != cptr) continue; /* ignore this client */ /* Build nick buffer */ nickstr[nickpos] = nickpos ? ',' : ' '; /* first char */ nickpos++; for (ptr = nick; *ptr; ptr++) /* store nick */ nickstr[nickpos++] = *ptr; if (current_mode != last_mode) { /* if mode changed... */ last_mode = current_mode; last_oplevel = oplevel; nickstr[nickpos++] = ':'; /* add a specifier */ if (current_mode & CHFL_VOICE) nickstr[nickpos++] = 'v'; if (current_mode & CHFL_CHANOP) { if (chptr->mode.apass[0]) nickpos += ircd_snprintf(0, nickstr + nickpos, sizeof(nickstr) - nickpos, "%u", oplevel); else nickstr[nickpos++] = 'o'; } } else if (current_mode & CHFL_CHANOP && oplevel != last_oplevel) { /* if just op level changed... */ nickstr[nickpos++] = ':'; /* add a specifier */ nickpos += ircd_snprintf(0, nickstr + nickpos, sizeof(nickstr) - nickpos, "%u", oplevel - last_oplevel); last_oplevel = oplevel; } if (!(member = find_member_link(chptr, acptr))) { add_user_to_channel(chptr, acptr, current_mode, oplevel); if (!(current_mode & CHFL_DELAYED)) sendcmdto_channel_butserv_butone(acptr, CMD_JOIN, chptr, NULL, 0, "%H", chptr); } else { /* The member was already joined (either by CREATE or JOIN). Remember the current mode. */ if (member->status & CHFL_CHANOP) member->status |= CHFL_BURST_ALREADY_OPPED; if (member->status & CHFL_VOICE) member->status |= CHFL_BURST_ALREADY_VOICED; /* Synchronize with the burst. */ member->status |= CHFL_BURST_JOINED | (current_mode & (CHFL_CHANOP|CHFL_VOICE)); SetOpLevel(member, oplevel); } } } param++; break; } /* switch (*parv[param]) */ } /* while (param < parc) */ nickstr[nickpos] = '\0'; banstr[banpos] = '\0'; if (parse_flags & MODE_PARSE_SET) { modebuf_extract(mbuf, modestr + 1); /* for sending BURST onward */ modestr[0] = modestr[1] ? ' ' : '\0'; } else modestr[0] = '\0'; sendcmdto_serv_butone(sptr, CMD_BURST, cptr, "%H %Tu%s%s%s", chptr, chptr->creationtime, modestr, nickstr, banstr); if (parse_flags & MODE_PARSE_WIPEOUT || banpos) mode_ban_invalidate(chptr); if (parse_flags & MODE_PARSE_SET) { /* any modes changed? */ /* first deal with channel members */ for (member = chptr->members; member; member = member->next_member) { if (member->status & CHFL_BURST_JOINED) { /* joined during burst */ if ((member->status & CHFL_CHANOP) && !(member->status & CHFL_BURST_ALREADY_OPPED)) modebuf_mode_client(mbuf, MODE_ADD | CHFL_CHANOP, member->user, OpLevel(member)); if ((member->status & CHFL_VOICE) && !(member->status & CHFL_BURST_ALREADY_VOICED)) modebuf_mode_client(mbuf, MODE_ADD | CHFL_VOICE, member->user, OpLevel(member)); } else if (parse_flags & MODE_PARSE_WIPEOUT) { /* wipeout old ops */ if (member->status & CHFL_CHANOP) modebuf_mode_client(mbuf, MODE_DEL | CHFL_CHANOP, member->user, OpLevel(member)); if (member->status & CHFL_VOICE) modebuf_mode_client(mbuf, MODE_DEL | CHFL_VOICE, member->user, OpLevel(member)); member->status = (member->status & ~(CHFL_CHANNEL_MANAGER | CHFL_CHANOP | CHFL_VOICE)) | CHFL_DEOPPED; } } /* Now deal with channel bans */ lp_p = &chptr->banlist; while (*lp_p) { lp = *lp_p; /* remove ban from channel */ if (lp->flags & (BAN_OVERLAPPED | BAN_BURST_WIPEOUT)) { char *bandup; DupString(bandup, lp->banstr); modebuf_mode_string(mbuf, MODE_DEL | MODE_BAN, bandup, 1); *lp_p = lp->next; /* clip out of list */ free_ban(lp); continue; } else if (lp->flags & BAN_BURSTED) /* add ban to channel */ modebuf_mode_string(mbuf, MODE_ADD | MODE_BAN, lp->banstr, 0); /* don't free banstr */ lp->flags &= BAN_IPMASK; /* reset the flag */ lp_p = &(*lp_p)->next; } } return mbuf ? modebuf_flush(mbuf) : 0; }
/** Handle a JOIN message from a client connection.
* See @ref m_functions for discussion of the arguments.
* @param[in] cptr Client that sent us the message.
* @param[in] sptr Original source of message.
* @param[in] parc Number of arguments.
* @param[in] parv Argument vector.
*/
int m_join(struct Client *cptr, struct Client *sptr, int parc, char *parv[])
{
struct Channel *chptr;
struct JoinBuf join;
struct JoinBuf create;
struct Gline *gline;
char *p = 0;
char *chanlist;
char *name;
char *keys;
if (parc < 2 || *parv[1] == '\0')
return need_more_params(sptr, "JOIN");
joinbuf_init(&join, sptr, cptr, JOINBUF_TYPE_JOIN, 0, 0);
joinbuf_init(&create, sptr, cptr, JOINBUF_TYPE_CREATE, 0, TStime());
chanlist = last0(cptr, sptr, parv[1]); /* find last "JOIN 0" */
keys = parv[2]; /* remember where keys are */
for (name = ircd_strtok(&p, chanlist, ","); name;
name = ircd_strtok(&p, 0, ",")) {
char *key = 0;
/* If we have any more keys, take the first for this channel. */
if (!BadPtr(keys)
&& (keys = strchr(key = keys, ',')))
*keys++ = '\0';
/* Empty keys are the same as no keys. */
if (key && !key[0])
key = 0;
if (!IsChannelName(name) || !strIsIrcCh(name))
{
/* bad channel name */
send_reply(sptr, ERR_NOSUCHCHANNEL, name);
continue;
}
if (cli_user(sptr)->joined >= feature_int(FEAT_MAXCHANNELSPERUSER)
&& !HasPriv(sptr, PRIV_CHAN_LIMIT)) {
send_reply(sptr, ERR_TOOMANYCHANNELS, name);
break; /* no point processing the other channels */
}
/* BADCHANed channel */
if ((gline = gline_find(name, GLINE_BADCHAN | GLINE_EXACT)) &&
GlineIsActive(gline) && !IsAnOper(sptr)) {
send_reply(sptr, ERR_BANNEDFROMCHAN, name);
continue;
}
if (!(chptr = FindChannel(name))) {
if (((name[0] == '&') && !feature_bool(FEAT_LOCAL_CHANNELS))
|| strlen(name) > IRCD_MIN(CHANNELLEN, feature_int(FEAT_CHANNELLEN))) {
send_reply(sptr, ERR_NOSUCHCHANNEL, name);
continue;
}
if (!(chptr = get_channel(sptr, name, CGT_CREATE)))
continue;
/* Try to add the new channel as a recent target for the user. */
if (check_target_limit(sptr, chptr, chptr->chname, 0)) {
chptr->members = 0;
destruct_channel(chptr);
continue;
}
joinbuf_join(&create, chptr, CHFL_CHANOP | CHFL_CHANNEL_MANAGER);
} else if (find_member_link(chptr, sptr)) {
continue; /* already on channel */
} else if (check_target_limit(sptr, chptr, chptr->chname, 0)) {
continue;
} else {
int flags = CHFL_DEOPPED;
int err = 0;
/* Check Apass/Upass -- since we only ever look at a single
* "key" per channel now, this hampers brute force attacks. */
if (key && !strcmp(key, chptr->mode.apass))
flags = CHFL_CHANOP | CHFL_CHANNEL_MANAGER;
else if (key && !strcmp(key, chptr->mode.upass))
flags = CHFL_CHANOP;
else if (chptr->users == 0 && !chptr->mode.apass[0]) {
/* Joining a zombie channel (zannel): give ops and increment TS. */
flags = CHFL_CHANOP;
chptr->creationtime++;
} else if (IsInvited(sptr, chptr)) {
/* Invites bypass these other checks. */
} else if (chptr->mode.mode & MODE_INVITEONLY)
err = ERR_INVITEONLYCHAN;
else if (chptr->mode.limit && (chptr->users >= chptr->mode.limit))
err = ERR_CHANNELISFULL;
else if ((chptr->mode.mode & MODE_REGONLY) && !IsAccount(sptr))
err = ERR_NEEDREGGEDNICK;
else if (find_ban(sptr, chptr->banlist))
err = ERR_BANNEDFROMCHAN;
else if (*chptr->mode.key && (!key || strcmp(key, chptr->mode.key)))
err = ERR_BADCHANNELKEY;
/* An oper with WALK_LCHAN privilege can join a local channel
* he otherwise could not join by using "OVERRIDE" as the key.
* This will generate a HACK(4) notice, but fails if the oper
* could normally join the channel. */
if (IsLocalChannel(chptr->chname)
&& HasPriv(sptr, PRIV_WALK_LCHAN)
&& !(flags & CHFL_CHANOP)
&& key && !strcmp(key, "OVERRIDE"))
{
switch (err) {
case 0:
if (strcmp(chptr->mode.key, "OVERRIDE")
&& strcmp(chptr->mode.apass, "OVERRIDE")
&& strcmp(chptr->mode.upass, "OVERRIDE")) {
send_reply(sptr, ERR_DONTCHEAT, chptr->chname);
continue;
}
break;
case ERR_INVITEONLYCHAN: err = 'i'; break;
case ERR_CHANNELISFULL: err = 'l'; break;
case ERR_BANNEDFROMCHAN: err = 'b'; break;
case ERR_BADCHANNELKEY: err = 'k'; break;
case ERR_NEEDREGGEDNICK: err = 'r'; break;
default: err = '?'; break;
}
/* send accountability notice */
if (err)
sendto_opmask_butone(0, SNO_HACK4, "OPER JOIN: %C JOIN %H "
"(overriding +%c)", sptr, chptr, err);
err = 0;
}
/* Is there some reason the user may not join? */
if (err) {
switch(err) {
case ERR_NEEDREGGEDNICK:
send_reply(sptr,
ERR_NEEDREGGEDNICK,
chptr->chname,
feature_str(FEAT_URLREG));
break;
default:
send_reply(sptr, err, chptr->chname);
break;
}
continue;
}
joinbuf_join(&join, chptr, flags);
if (flags & CHFL_CHANOP) {
struct ModeBuf mbuf;
/* Always let the server op him: this is needed on a net with older servers
because they 'destruct' channels immediately when they become empty without
sending out a DESTRUCT message. As a result, they would always bounce a mode
(as HACK(2)) when the user ops himself.
(There is also no particularly good reason to have the user op himself.)
*/
modebuf_init(&mbuf, &me, cptr, chptr, MODEBUF_DEST_SERVER);
modebuf_mode_client(&mbuf, MODE_ADD | MODE_CHANOP, sptr,
chptr->mode.apass[0] ? ((flags & CHFL_CHANNEL_MANAGER) ? 0 : 1) : MAXOPLEVEL);
modebuf_flush(&mbuf);
}
}
del_invite(sptr, chptr);
if (chptr->topic[0]) {
send_reply(sptr, RPL_TOPIC, chptr->chname, chptr->topic);
send_reply(sptr, RPL_TOPICWHOTIME, chptr->chname, chptr->topic_nick,
chptr->topic_time);
}
do_names(sptr, chptr, NAMES_ALL|NAMES_EON); /* send /names list */
}
joinbuf_flush(&join); /* must be first, if there's a JOIN 0 */
joinbuf_flush(&create);
return 0;
}
/** Handle a CREATE message from a server.
* Atomically creates a new channel and ops the creator.
*
* \a parv has the following elements:
* \li \a parv[1] Comma-separated list of channels to create.
* \li \a parv[2] Creation timestamp for the channel(s).
*
* See @ref m_functions for discussion of the arguments.
* @param[in] cptr Client that sent us the message.
* @param[in] sptr Original source of message.
* @param[in] parc Number of arguments.
* @param[in] parv Argument vector.
*/
int ms_create(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
{
time_t chanTS; /* channel creation time */
char *p; /* strtok state */
char *name; /* channel name */
struct Channel *chptr; /* channel */
struct JoinBuf join; /* join and create buffers */
struct JoinBuf create;
struct ModeBuf mbuf; /* a mode buffer */
int badop; /* a flag */
if (IsServer(sptr))
return protocol_violation(sptr,"%s tried to CREATE a channel", cli_name(sptr));
/* sanity checks: Only accept CREATE messages from servers */
if (parc < 3 || *parv[2] == '\0')
return need_more_params(sptr,"CREATE");
chanTS = atoi(parv[2]);
/* A create that didn't appear during a burst has that servers idea of
* the current time. Use it for lag calculations.
*/
if (!IsBurstOrBurstAck(sptr) && 0 != chanTS)
cli_serv(cli_user(sptr)->server)->lag = TStime() - chanTS;
/* If this server is >1 minute fast, warn */
if (TStime() - chanTS<-60)
{
static time_t rate;
sendto_opmask_ratelimited(0, SNO_NETWORK, &rate,
"Timestamp drift from %C (%is); issuing "
"SETTIME to correct this",
cli_user(sptr)->server,
chanTS - TStime());
/* Now issue a SETTIME to resync. If we're in the wrong, our
* (RELIABLE_CLOCK) hub will bounce a SETTIME back to us.
*/
sendcmdto_prio_one(&me, CMD_SETTIME, cli_user(sptr)->server,
"%Tu %C", TStime(), cli_user(sptr)->server);
}
joinbuf_init(&join, sptr, cptr, JOINBUF_TYPE_JOIN, 0, 0);
joinbuf_init(&create, sptr, cptr, JOINBUF_TYPE_CREATE, 0, chanTS);
/* For each channel in the comma separated list: */
for (name = ircd_strtok(&p, parv[1], ","); name;
name = ircd_strtok(&p, 0, ",")) {
badop = 0;
if (IsLocalChannel(name))
continue;
if ((chptr = FindChannel(name)))
{
/* Is the remote server confused? */
if (find_member_link(chptr, sptr)) {
protocol_violation(sptr, "%s tried to CREATE a channel already joined", cli_name(sptr));
continue;
}
/* Check if we need to bounce a mode */
if (TStime() - chanTS > TS_LAG_TIME ||
(chptr->creationtime && chanTS > chptr->creationtime &&
/* Accept CREATE for zannels. This is only really necessary on a network
with servers prior to 2.10.12.02: we just accept their TS and ignore
the fact that it was a zannel. The influence of this on a network
that is completely 2.10.12.03 or higher is neglectable: Normally
a server only sends a CREATE after first sending a DESTRUCT. Thus,
by receiving a CREATE for a zannel one of three things happened:
1. The DESTRUCT was sent during a net.break; this could mean that
our zannel is at the verge of expiring too, it should have been
destructed. It is correct to copy the newer TS now, all modes
already have been reset, so it will be as if it was destructed
and immediately recreated. In order to avoid desyncs of modes,
we don't accept a CREATE for channels that have +A set.
2. The DESTRUCT passed, then someone created the channel on our
side and left it again. In this situation we have a near
simultaneous creation on two servers; the person on our side
already left within the time span of a message propagation.
The channel will therefore be less than 48 hours old and no
'protection' is necessary.
3. The source server sent the CREATE while linking,
before it got the BURST for our zannel. If this
happens, we should reset the channel back to the old
timestamp. This can be distinguished from case #1 by
checking IsBurstOrBurstAck(cli_user(sptr)->server).
*/
#if defined(UNDERNET)
!(chptr->users == 0 && !chptr->mode.apass[0]))) {
#else
!(chptr->users == 0))) {
#endif
if (!IsBurstOrBurstAck(cli_user(sptr)->server)) {
modebuf_init(&mbuf, sptr, cptr, chptr,
(MODEBUF_DEST_SERVER | /* Send mode to server */
MODEBUF_DEST_HACK2 | /* Send a HACK(2) message */
MODEBUF_DEST_BOUNCE)); /* And bounce the mode */
#if defined(UNDERNET)
modebuf_mode_client(&mbuf, MODE_ADD | MODE_CHANOP, sptr, MAXOPLEVEL + 1);
#else
modebuf_mode_client(&mbuf, MODE_ADD | MODE_CHANOP, sptr, 0);
#endif
modebuf_flush(&mbuf);
badop = 1;
} else if (chanTS > chptr->creationtime + 4) {
/* If their handling of the BURST will lead to deopping the
* user, have the user join without getting ops (if the
* server's handling of the BURST keeps their ops, the channel
* will use our timestamp).
*/
badop = 1;
}
if (badop)
joinbuf_join(&join, chptr, 0);
}
}
else /* Channel doesn't exist: create it */
chptr = get_channel(sptr, name, CGT_CREATE);
if (!badop) {
/* Set (or correct) our copy of the TS */
chptr->creationtime = chanTS;
joinbuf_join(&create, chptr, CHFL_CHANOP);
}
}
/*
* ms_kick - server message handler
*
* parv[0] = sender prefix
* parv[1] = channel
* parv[2] = client to kick
* parv[parc-1] = kick comment
*/
int ms_kick(struct Client *cptr, struct Client *sptr, int parc, char *parv[])
{
struct Client *who;
struct Channel *chptr;
struct Membership *member = 0, *sptr_link = 0;
char *name, *comment;
ClrFlag(sptr, FLAG_TS8);
if (parc < 3 || *parv[1] == '\0')
return need_more_params(sptr, "KICK");
name = parv[1];
comment = parv[parc - 1];
/* figure out who gets kicked from what */
if (IsLocalChannel(name) ||
!(chptr = get_channel(sptr, name, CGT_NO_CREATE)) ||
!(who = findNUser(parv[2])))
return 0;
/* We go ahead and pass on the KICK for users not on the channel */
member = find_member_link(chptr, who);
if (member && IsZombie(member))
{
/* We might get a KICK from a zombie's own server because the user
* net-rode during a burst (which always generates a KICK) *and*
* was kicked via another server. In that case, we must remove
* the user from the channel.
*/
if (sptr == cli_user(who)->server)
{
remove_user_from_channel(who, chptr);
}
/* Otherwise, we treat zombies like they are not channel members. */
member = 0;
}
/* Send HACK notice, but not for servers in BURST */
/* 2002-10-17: Don't send HACK if the users local server is kicking them */
if (IsServer(sptr) &&
!IsBurstOrBurstAck(sptr) &&
sptr!=cli_user(who)->server)
sendto_opmask_butone(0, SNO_HACK4, "HACK: %C KICK %H %C %s", sptr, chptr,
who, comment);
/* Unless someone accepted it downstream (or the user isn't on the channel
* here), if kicker is not on channel, or if kicker is not a channel
* operator, bounce the kick
*/
if (!IsServer(sptr) && member && cli_from(who) != cptr &&
(!(sptr_link = find_member_link(chptr, sptr)) || !IsChanOp(sptr_link))) {
sendto_opmask_butone(0, SNO_HACK2, "HACK: %C KICK %H %C %s", sptr, chptr,
who, comment);
sendcmdto_one(who, CMD_JOIN, cptr, "%H", chptr);
/* Reop/revoice member */
if (IsChanOp(member) || HasVoice(member)) {
struct ModeBuf mbuf;
modebuf_init(&mbuf, sptr, cptr, chptr,
(MODEBUF_DEST_SERVER | /* Send mode to a server */
MODEBUF_DEST_DEOP | /* Deop the source */
MODEBUF_DEST_BOUNCE)); /* And bounce the MODE */
if (IsChanOp(member))
modebuf_mode_client(&mbuf, MODE_DEL | MODE_CHANOP, who, OpLevel(member));
if (HasVoice(member))
modebuf_mode_client(&mbuf, MODE_DEL | MODE_VOICE, who, MAXOPLEVEL + 1);
modebuf_flush(&mbuf);
}
} else {
/* Propagate kick... */
sendcmdto_serv_butone(sptr, CMD_KICK, cptr, "%H %C :%s", chptr, who,
comment);
if (member) { /* and tell the channel about it */
if (IsDelayedJoin(member)) {
if (MyUser(who))
sendcmdto_one(IsServer(sptr) ? &his : sptr, CMD_KICK,
who, "%H %C :%s", chptr, who, comment);
} else {
sendcmdto_channel_butserv_butone(IsServer(sptr) ? &his : sptr, CMD_KICK,
chptr, NULL, 0, "%H %C :%s", chptr, who,
comment);
}
make_zombie(member, who, cptr, sptr, chptr);
}
}
return 0;
}
/* * ms_burst - server message handler * * -- by Run [email protected] december 1995 till march 1997 * * parv[0] = sender prefix * parv[1] = channel name * parv[2] = channel timestamp * The meaning of the following parv[]'s depend on their first character: * If parv[n] starts with a '+': * Net burst, additive modes * parv[n] = <mode> * parv[n+1] = <param> (optional) * parv[n+2] = <param> (optional) * If parv[n] starts with a '%', then n will be parc-1: * parv[n] = %<ban> <ban> <ban> ... * If parv[n] starts with another character: * parv[n] = <nick>[:<mode>],<nick>[:<mode>],... * where <mode> is the channel mode (ov) of nick and all following nicks. * * Example: * "S BURST #channel 87654321 +ntkl key 123 AAA,AAB:o,BAA,BAB:ov :%ban1 ban2" * * Anti net.ride code. * * When the channel already exist, and its TS is larger then * the TS in the BURST message, then we cancel all existing modes. * If its is smaller then the received BURST message is ignored. * If it's equal, then the received modes are just added. */ int ms_burst(struct Client *cptr, struct Client *sptr, int parc, char *parv[]) { struct ModeBuf modebuf, *mbuf = 0; struct Channel *chptr; time_t timestamp; struct Membership *member, *nmember; struct SLink *lp, **lp_p; unsigned int parse_flags = (MODE_PARSE_FORCE | MODE_PARSE_BURST); int param, nickpos = 0, banpos = 0; char modestr[BUFSIZE], nickstr[BUFSIZE], banstr[BUFSIZE]; if (parc < 3) return protocol_violation(sptr,"Too few parameters for BURST"); if (!IsBurst(sptr)) /* don't allow BURST outside of burst */ return exit_client_msg(cptr, cptr, &me, "HACK: BURST message outside " "net.burst from %s", cli_name(sptr)); if (!(chptr = get_channel(sptr, parv[1], CGT_CREATE))) return 0; /* can't create the channel? */ timestamp = atoi(parv[2]); if (!chptr->creationtime || chptr->creationtime > timestamp) { /* * Kick local members if channel is +i or +k and our TS was larger * than the burst TS (anti net.ride). The modes hack is here because * we have to do this before mode_parse, as chptr may go away. */ for (param = 3; param < parc; param++) { if (parv[param][0] != '+') continue; if (strchr(parv[param], 'i') || strchr(parv[param], 'k')) { /* Clear any outstanding rogue invites */ mode_invite_clear(chptr); for (member = chptr->members; member; member = nmember) { nmember=member->next_member; if (!MyUser(member->user) || IsZombie(member)) continue; sendcmdto_serv_butone(&me, CMD_KICK, NULL, "%H %C :Net Rider", chptr, member->user); sendcmdto_channel_butserv_butone(&me, CMD_KICK, chptr, NULL, "%H %C :Net Rider", chptr, member->user); make_zombie(member, member->user, &me, &me, chptr); } } break; } /* If the channel had only locals, it went away by now. */ if (!(chptr = get_channel(sptr, parv[1], CGT_CREATE))) return 0; /* can't create the channel? */ } /* turn off burst joined flag */ for (member = chptr->members; member; member = member->next_member) member->status &= ~CHFL_BURST_JOINED; if (!chptr->creationtime) /* mark channel as created during BURST */ chptr->mode.mode |= MODE_BURSTADDED; /* new channel or an older one */ if (!chptr->creationtime || chptr->creationtime > timestamp) { chptr->creationtime = timestamp; modebuf_init(mbuf = &modebuf, &me, cptr, chptr, MODEBUF_DEST_CHANNEL | MODEBUF_DEST_NOKEY); modebuf_mode(mbuf, MODE_DEL | chptr->mode.mode); /* wipeout modes */ chptr->mode.mode &= ~(MODE_ADD | MODE_DEL | MODE_PRIVATE | MODE_SECRET | MODE_MODERATED | MODE_TOPICLIMIT | MODE_INVITEONLY | MODE_NOPRIVMSGS); parse_flags |= (MODE_PARSE_SET | MODE_PARSE_WIPEOUT); /* wipeout keys */ /* mark bans for wipeout */ for (lp = chptr->banlist; lp; lp = lp->next) lp->flags |= CHFL_BURST_BAN_WIPEOUT; /* clear topic set by netrider (if set) */ if (*chptr->topic) { *chptr->topic = '\0'; *chptr->topic_nick = '\0'; chptr->topic_time = 0; sendcmdto_channel_butserv_butone(&me, CMD_TOPIC, chptr, NULL, "%H :%s", chptr, chptr->topic); } } else if (chptr->creationtime == timestamp) { modebuf_init(mbuf = &modebuf, &me, cptr, chptr, MODEBUF_DEST_CHANNEL | MODEBUF_DEST_NOKEY); parse_flags |= MODE_PARSE_SET; /* set new modes */ } param = 3; /* parse parameters */ while (param < parc) { switch (*parv[param]) { case '+': /* parameter introduces a mode string */ param += mode_parse(mbuf, cptr, sptr, chptr, parc - param, parv + param, parse_flags); break; case '%': /* parameter contains bans */ if (parse_flags & MODE_PARSE_SET) { char *banlist = parv[param] + 1, *p = 0, *ban, *ptr; struct SLink *newban; for (ban = ircd_strtok(&p, banlist, " "); ban; ban = ircd_strtok(&p, 0, " ")) { ban = collapse(pretty_mask(ban)); /* * Yeah, we should probably do this elsewhere, and make it better * and more general; this will hold until we get there, though. * I dislike the current add_banid API... -Kev * * I wish there were a better algo. for this than the n^2 one * shown below *sigh* */ for (lp = chptr->banlist; lp; lp = lp->next) { if (!ircd_strcmp(lp->value.ban.banstr, ban)) { ban = 0; /* don't add ban */ lp->flags &= ~CHFL_BURST_BAN_WIPEOUT; /* not wiping out */ break; /* new ban already existed; don't even repropagate */ } else if (!(lp->flags & CHFL_BURST_BAN_WIPEOUT) && !mmatch(lp->value.ban.banstr, ban)) { ban = 0; /* don't add ban unless wiping out bans */ break; /* new ban is encompassed by an existing one; drop */ } else if (!mmatch(ban, lp->value.ban.banstr)) lp->flags |= CHFL_BAN_OVERLAPPED; /* remove overlapping ban */ if (!lp->next) break; } if (ban) { /* add the new ban to the end of the list */ /* Build ban buffer */ if (!banpos) { banstr[banpos++] = ' '; banstr[banpos++] = ':'; banstr[banpos++] = '%'; } else banstr[banpos++] = ' '; for (ptr = ban; *ptr; ptr++) /* add ban to buffer */ banstr[banpos++] = *ptr; newban = make_link(); /* create new ban */ DupString(newban->value.ban.banstr, ban); DupString(newban->value.ban.who, cli_name(feature_bool(FEAT_HIS_BANWHO) ? &me : sptr)); newban->value.ban.when = TStime(); newban->flags = CHFL_BAN | CHFL_BURST_BAN; /* set flags */ if ((ptr = strrchr(ban, '@')) && check_if_ipmask(ptr + 1)) newban->flags |= CHFL_BAN_IPMASK; newban->next = 0; if (lp) lp->next = newban; /* link it in */ else chptr->banlist = newban; } } } param++; /* look at next param */ break; default: /* parameter contains clients */ { struct Client *acptr; char *nicklist = parv[param], *p = 0, *nick, *ptr; int default_mode = CHFL_DEOPPED | CHFL_BURST_JOINED; int last_mode = CHFL_DEOPPED | CHFL_BURST_JOINED; for (nick = ircd_strtok(&p, nicklist, ","); nick; nick = ircd_strtok(&p, 0, ",")) { if ((ptr = strchr(nick, ':'))) { /* new flags; deal */ *ptr++ = '\0'; if (parse_flags & MODE_PARSE_SET) { for (default_mode = CHFL_DEOPPED | CHFL_BURST_JOINED; *ptr; ptr++) { if (*ptr == 'o') /* has oper status */ default_mode = (default_mode & ~CHFL_DEOPPED) | CHFL_CHANOP; else if (*ptr == 'v') /* has voice status */ default_mode |= CHFL_VOICE; else /* I don't recognize that flag */ break; /* so stop processing */ } } } if (!(acptr = findNUser(nick)) || cli_from(acptr) != cptr) continue; /* ignore this client */ /* Build nick buffer */ nickstr[nickpos] = nickpos ? ',' : ' '; /* first char */ nickpos++; for (ptr = nick; *ptr; ptr++) /* store nick */ nickstr[nickpos++] = *ptr; if (default_mode != last_mode) { /* if mode changed... */ last_mode = default_mode; nickstr[nickpos++] = ':'; /* add a specifier */ if (default_mode & CHFL_CHANOP) nickstr[nickpos++] = 'o'; if (default_mode & CHFL_VOICE) nickstr[nickpos++] = 'v'; } add_user_to_channel(chptr, acptr, default_mode); sendcmdto_channel_butserv_butone(acptr, CMD_JOIN, chptr, NULL, "%H", chptr); } } param++; break; } /* switch (*parv[param]) { */ } /* while (param < parc) { */ nickstr[nickpos] = '\0'; banstr[banpos] = '\0'; if (parse_flags & MODE_PARSE_SET) { modebuf_extract(mbuf, modestr + 1); /* for sending BURST onward */ modestr[0] = modestr[1] ? ' ' : '\0'; } else modestr[0] = '\0'; sendcmdto_serv_butone(sptr, CMD_BURST, cptr, "%H %Tu%s%s%s", chptr, chptr->creationtime, modestr, nickstr, banstr); if (parse_flags & MODE_PARSE_WIPEOUT || banpos) mode_ban_invalidate(chptr); if (parse_flags & MODE_PARSE_SET) { /* any modes changed? */ /* first deal with channel members */ for (member = chptr->members; member; member = member->next_member) { if (member->status & CHFL_BURST_JOINED) { /* joined during burst */ if (member->status & CHFL_CHANOP) modebuf_mode_client(mbuf, MODE_ADD | CHFL_CHANOP, member->user); if (member->status & CHFL_VOICE) modebuf_mode_client(mbuf, MODE_ADD | CHFL_VOICE, member->user); } else if (parse_flags & MODE_PARSE_WIPEOUT) { /* wipeout old ops */ if (member->status & CHFL_CHANOP) modebuf_mode_client(mbuf, MODE_DEL | CHFL_CHANOP, member->user); if (member->status & CHFL_VOICE) modebuf_mode_client(mbuf, MODE_DEL | CHFL_VOICE, member->user); member->status = ((member->status & ~(CHFL_CHANOP | CHFL_VOICE)) | CHFL_DEOPPED); } } /* Now deal with channel bans */ lp_p = &chptr->banlist; while (*lp_p) { lp = *lp_p; /* remove ban from channel */ if (lp->flags & (CHFL_BAN_OVERLAPPED | CHFL_BURST_BAN_WIPEOUT)) { modebuf_mode_string(mbuf, MODE_DEL | MODE_BAN, lp->value.ban.banstr, 1); /* let it free banstr */ *lp_p = lp->next; /* clip out of list */ MyFree(lp->value.ban.who); /* free who */ free_link(lp); /* free ban */ continue; } else if (lp->flags & CHFL_BURST_BAN) /* add ban to channel */ modebuf_mode_string(mbuf, MODE_ADD | MODE_BAN, lp->value.ban.banstr, 0); /* don't free banstr */ lp->flags &= (CHFL_BAN | CHFL_BAN_IPMASK); /* reset the flag */ lp_p = &(*lp_p)->next; } } return mbuf ? modebuf_flush(mbuf) : 0; }
/*
* do_clearmode(struct Client *cptr, struct Client *sptr,
* struct Channel *chptr, char *control)
*
* This is the function that actually clears the channel modes.
*/
static int
do_clearmode(struct Client *cptr, struct Client *sptr, struct Channel *chptr,
char *control)
{
static int flags[] = {
MODE_CHANOP, 'o',
MODE_VOICE, 'v',
MODE_PRIVATE, 'p',
MODE_SECRET, 's',
MODE_MODERATED, 'm',
MODE_TOPICLIMIT, 't',
MODE_INVITEONLY, 'i',
MODE_NOPRIVMSGS, 'n',
MODE_KEY, 'k',
MODE_BAN, 'b',
MODE_LIMIT, 'l',
MODE_REGONLY, 'r',
MODE_DELJOINS, 'D',
0x0, 0x0
};
int *flag_p;
unsigned int del_mode = 0;
char control_buf[20];
int control_buf_i = 0;
struct ModeBuf mbuf;
struct Ban *link, *next;
struct Membership *member;
/* Ok, so what are we supposed to get rid of? */
for (; *control; control++) {
for (flag_p = flags; flag_p[0]; flag_p += 2)
if (*control == flag_p[1]) {
del_mode |= flag_p[0];
break;
}
}
if (!del_mode)
return 0; /* nothing to remove; ho hum. */
modebuf_init(&mbuf, sptr, cptr, chptr,
(MODEBUF_DEST_CHANNEL | /* Send MODE to channel */
MODEBUF_DEST_OPMODE | /* Treat it like an OPMODE */
MODEBUF_DEST_HACK4)); /* Generate a HACK(4) notice */
modebuf_mode(&mbuf, MODE_DEL | (del_mode & chptr->mode.mode));
chptr->mode.mode &= ~del_mode; /* and of course actually delete them */
/* If we're removing invite, remove all the invites */
if (del_mode & MODE_INVITEONLY)
mode_invite_clear(chptr);
/*
* If we're removing the key, note that; note that we can't clear
* the key until after modebuf_* are done with it
*/
if (del_mode & MODE_KEY && *chptr->mode.key)
modebuf_mode_string(&mbuf, MODE_DEL | MODE_KEY, chptr->mode.key, 0);
/* If we're removing the limit, note that and clear the limit */
if (del_mode & MODE_LIMIT && chptr->mode.limit) {
modebuf_mode_uint(&mbuf, MODE_DEL | MODE_LIMIT, chptr->mode.limit);
chptr->mode.limit = 0; /* not referenced, so safe */
}
/*
* Go through and mark the bans for deletion; note that we can't
* free them until after modebuf_* are done with them
*/
if (del_mode & MODE_BAN) {
for (link = chptr->banlist; link; link = next) {
char *bandup;
next = link->next;
DupString(bandup, link->banstr);
modebuf_mode_string(&mbuf, MODE_DEL | MODE_BAN, /* delete ban */
bandup, 1);
free_ban(link);
}
chptr->banlist = 0;
}
/* Deal with users on the channel */
if (del_mode & (MODE_BAN | MODE_CHANOP | MODE_VOICE))
for (member = chptr->members; member; member = member->next_member) {
if (IsZombie(member)) /* we ignore zombies */
continue;
if (del_mode & MODE_BAN) /* If we cleared bans, clear the valid flags */
ClearBanValid(member);
/* Drop channel operator status */
if (IsChanOp(member) && del_mode & MODE_CHANOP) {
modebuf_mode_client(&mbuf, MODE_DEL | MODE_CHANOP, member->user, MAXOPLEVEL + 1);
member->status &= ~CHFL_CHANOP;
}
/* Drop voice */
if (HasVoice(member) && del_mode & MODE_VOICE) {
modebuf_mode_client(&mbuf, MODE_DEL | MODE_VOICE, member->user, MAXOPLEVEL + 1);
member->status &= ~CHFL_VOICE;
}
}
/* And flush the modes to the channel */
modebuf_flush(&mbuf);
/* Finally, we can clear the key... */
if (del_mode & MODE_KEY)
chptr->mode.key[0] = '\0';
/* Ok, build control string again */
for (flag_p = flags; flag_p[0]; flag_p += 2)
if (del_mode & flag_p[0])
control_buf[control_buf_i++] = flag_p[1];
control_buf[control_buf_i] = '\0';
/* Log it... */
log_write(LS_OPERMODE, L_INFO, LOG_NOSNOTICE, "%#C CLEARMODE %H %s", sptr,
chptr, control_buf);
/* Then send it */
if (!IsLocalChannel(chptr->chname))
sendcmdto_serv_butone(sptr, CMD_CLEARMODE, cptr, "%H %s", chptr,
control_buf);
return 0;
}
void do_join(struct Client *cptr, struct Client *sptr, struct JoinBuf *join,
struct JoinBuf *create, char *chan, char *key, int level)
{
struct Channel *chptr;
struct Gline *gline;
/* BADCHANed channel */
if ((gline = gline_find(chan, GLINE_BADCHAN | GLINE_EXACT)) &&
GlineIsActive(gline) && !IsAnOper(sptr)) {
send_reply(sptr, ERR_BANNEDFROMCHAN, chan);
return;
}
/* Bouncy +L joins */
if (level > feature_int(FEAT_MAX_BOUNCE)) {
sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :*** Couldn't join %s ! - Redirection (+L) setting was too bouncy", sptr, chan);
return;
}
if (!(chptr = FindChannel(chan))) {
if (((chan[0] == '&') && !feature_bool(FEAT_LOCAL_CHANNELS))
|| strlen(chan) > IRCD_MIN(CHANNELLEN, feature_int(FEAT_CHANNELLEN))) {
send_reply(sptr, ERR_NOSUCHCHANNEL, chan);
return;
}
if (feature_bool(FEAT_CHANNEL_CREATE_IRCOPONLY) && !IsAnOper(sptr) && !IsChannelService(sptr)) {
send_reply(sptr, ERR_NOSUCHCHANNEL, chan);
return;
}
if (!(chptr = get_channel(sptr, chan, CGT_CREATE)))
return;
/* Try to add the new channel as a recent target for the user. */
if (check_target_limit(sptr, chptr, chptr->chname, 0)) {
chptr->members = 0;
destruct_channel(chptr);
return;
}
joinbuf_join(create, chptr, CHFL_CHANOP | CHFL_CHANNEL_MANAGER);
} else if (find_member_link(chptr, sptr)) {
return; /* already on channel */
} else if (check_target_limit(sptr, chptr, chptr->chname, 0)) {
return;
} else {
int flags = CHFL_DEOPPED;
int err = 0;
int excepted = 0;
int exceptkli = 0;
struct Ban *ban = NULL;
if (*chptr->mode.redir && (*chptr->mode.redir != '\0')) {
if (chptr->users >= chptr->mode.limit) {
if (IsNoLink(sptr))
send_reply(sptr, ERR_LINKCHAN, chptr->chname, chptr->mode.redir);
else if (!IsChannelName(chptr->mode.redir) || !strIsIrcCh(chptr->mode.redir))
send_reply(sptr, ERR_NOSUCHCHANNEL, chptr->mode.redir);
else {
send_reply(sptr, ERR_LINKSET, chptr->chname, chptr->chname, chptr->mode.redir);
do_join(cptr, sptr, join, create, chptr->mode.redir, key, level+1);
}
return;
}
}
if (find_ban(sptr, chptr->exceptlist, EBAN_EXCEPTLIST, 0)) {
if (feature_bool(FEAT_CHMODE_e_CHMODEEXCEPTION))
exceptkli = 1;
excepted = 1;
}
/* Check Apass/Upass -- since we only ever look at a single
* "key" per channel now, this hampers brute force attacks. */
if (feature_bool(FEAT_CHMODE_Z_STRICT) && (chptr->mode.exmode & EXMODE_SSLONLY) && !IsSSL(sptr))
err = ERR_SSLONLYCHAN;
else if (key && !strcmp(key, chptr->mode.apass))
flags = CHFL_CHANOP | CHFL_CHANNEL_MANAGER;
else if (key && !strcmp(key, chptr->mode.upass))
flags = CHFL_CHANOP;
else if (chptr->users == 0 && !chptr->mode.apass[0] && !(chptr->mode.exmode & EXMODE_PERSIST)) {
/* Joining a zombie channel (zannel): give ops and increment TS. */
flags = CHFL_CHANOP;
chptr->creationtime++;
} else if (IsXtraOp(sptr)) {
/* XtraOp bypasses all other checks. */
} else if ((chptr->mode.exmode & EXMODE_SSLONLY) && !IsSSL(sptr))
err = ERR_SSLONLYCHAN;
else if (IsInvited(sptr, chptr)) {
/* Invites bypass these other checks. */
} else if (*chptr->mode.key && (!key || strcmp(key, chptr->mode.key)) && !exceptkli)
err = ERR_BADCHANNELKEY;
else if (*chptr->mode.key && feature_bool(FEAT_FLEXIBLEKEYS) && (key && !strcmp(key, chptr->mode.key))) {
/* Assume key checked by previous condition was found to be correct
and allow join because FEAT_FLEXIBLEKEYS was enabled */
} else if ((chptr->mode.mode & MODE_INVITEONLY) && !exceptkli)
err = ERR_INVITEONLYCHAN;
else if (chptr->mode.limit && (chptr->users >= chptr->mode.limit) && !exceptkli)
err = ERR_CHANNELISFULL;
else if ((chptr->mode.mode & MODE_REGONLY) && !IsAccount(sptr))
err = ERR_NEEDREGGEDNICK;
else if ((chptr->mode.exmode & EXMODE_ADMINONLY) && !IsAdmin(sptr))
err = ERR_ADMINONLYCHAN;
else if ((chptr->mode.exmode & EXMODE_OPERONLY) && !IsAnOper(sptr))
err = ERR_OPERONLYCHAN;
else if ((ban = find_ban(sptr, chptr->banlist, EBAN_NONE, 0)) && !excepted)
err = ERR_BANNEDFROMCHAN;
/* An oper with WALK_LCHAN privilege can join a local channel
* he otherwise could not join by using "OVERRIDE" as the key.
* This will generate a HACK(4) notice, but fails if the oper
* could normally join the channel. */
if (IsLocalChannel(chptr->chname)
&& HasPriv(sptr, PRIV_WALK_LCHAN)
&& !(flags & CHFL_CHANOP)
&& key && !strcmp(key, "OVERRIDE"))
{
switch (err) {
case 0:
if (strcmp(chptr->mode.key, "OVERRIDE")
&& strcmp(chptr->mode.apass, "OVERRIDE")
&& strcmp(chptr->mode.upass, "OVERRIDE")) {
send_reply(sptr, ERR_DONTCHEAT, chptr->chname);
return;
}
break;
case ERR_INVITEONLYCHAN: err = 'i'; break;
case ERR_CHANNELISFULL: err = 'l'; break;
case ERR_BANNEDFROMCHAN: err = 'b'; break;
case ERR_BADCHANNELKEY: err = 'k'; break;
case ERR_NEEDREGGEDNICK: err = 'r'; break;
case ERR_ADMINONLYCHAN: err = 'a'; break;
case ERR_OPERONLYCHAN: err = 'O'; break;
case ERR_SSLONLYCHAN: err = 'Z'; break;
default: err = '?'; break;
}
/* send accountability notice */
if (err)
sendto_opmask_butone(0, SNO_HACK4, "OPER JOIN: %C JOIN %H "
"(overriding +%c)", sptr, chptr, err);
err = 0;
}
/* Is there some reason the user may not join? */
if (err) {
switch(err) {
case ERR_NEEDREGGEDNICK:
send_reply(sptr,
ERR_NEEDREGGEDNICK,
chptr->chname,
feature_str(FEAT_URLREG));
break;
default:
send_reply(sptr, err, chptr->chname);
break;
}
return;
}
joinbuf_join(join, chptr, flags);
if (flags & CHFL_CHANOP) {
struct ModeBuf mbuf;
/* Always let the server op him: this is needed on a net with older servers
because they 'destruct' channels immediately when they become empty without
sending out a DESTRUCT message. As a result, they would always bounce a mode
(as HACK(2)) when the user ops himself.
(There is also no particularly good reason to have the user op himself.)
*/
modebuf_init(&mbuf, &me, cptr, chptr, MODEBUF_DEST_SERVER);
modebuf_mode_client(&mbuf, MODE_ADD | MODE_CHANOP, sptr,
chptr->mode.apass[0] ? ((flags & CHFL_CHANNEL_MANAGER) ? 0 : 1) : MAXOPLEVEL);
modebuf_flush(&mbuf);
}
}
del_invite(sptr, chptr);
if (chptr->topic[0]) {
send_reply(sptr, RPL_TOPIC, chptr->chname, chptr->topic);
send_reply(sptr, RPL_TOPICWHOTIME, chptr->chname, chptr->topic_nick,
chptr->topic_time);
}
do_names(sptr, chptr, NAMES_ALL|NAMES_EON); /* send /names list */
}