/** 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 JoinBuf join;
struct JoinBuf create;
char *p = 0;
char *chanlist;
char *name;
char *keys;
if (parc < 2 || *parv[1] == '\0')
return need_more_params(sptr, "JOIN");
if (!IsAnOper(sptr) && IsRestrictJoin(sptr)) {
send_reply(sptr, ERR_BANNEDFROMCHAN, parv[1]);
return 0;
}
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 >= get_client_maxchans(sptr)
&& !HasPriv(sptr, PRIV_CHAN_LIMIT)) {
send_reply(sptr, ERR_TOOMANYCHANNELS, name);
break; /* no point processing the other channels */
}
do_join(cptr, sptr, &join, &create, name, key, 0);
}
joinbuf_flush(&join); /* must be first, if there's a JOIN 0 */
joinbuf_flush(&create);
return 0;
}
/*
* m_part - generic message handler
*
* parv[0] = sender prefix
* parv[1] = channel
* parv[parc - 1] = comment
*/
int m_part(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
{
struct Channel *chptr;
struct Membership *member;
struct JoinBuf parts;
unsigned int flags = 0;
char *p = 0;
char *name;
ClrFlag(sptr, FLAG_TS8);
/* check number of arguments */
if (parc < 2 || parv[1][0] == '\0')
return need_more_params(sptr, "PART");
/* init join/part buffer */
joinbuf_init(&parts, sptr, cptr, JOINBUF_TYPE_PART,
(parc > 2 && !EmptyString(parv[parc - 1])) ? parv[parc - 1] : 0,
0);
/* scan through channel list */
for (name = ircd_strtok(&p, parv[1], ","); name;
name = ircd_strtok(&p, 0, ",")) {
chptr = get_channel(sptr, name, CGT_NO_CREATE); /* look up channel */
if (!chptr) { /* complain if there isn't such a channel */
send_reply(sptr, ERR_NOSUCHCHANNEL, name);
continue;
}
if (!(member = find_member_link(chptr, sptr))) { /* complain if not on */
send_reply(sptr, ERR_NOTONCHANNEL, chptr->chname);
continue;
}
assert(!IsZombie(member)); /* Local users should never zombie */
if (!member_can_send_to_channel(member, 0))
{
flags |= CHFL_BANNED;
/* Remote clients don't want to see a comment either. */
parts.jb_comment = 0;
}
if (IsDelayedJoin(member))
flags |= CHFL_DELAYED;
joinbuf_join(&parts, chptr, flags); /* part client from channel */
}
return joinbuf_flush(&parts); /* flush channel parts */
}
/*
* ms_part - server message handler
*
* parv[0] = sender prefix
* parv[1] = channel
* parv[parc - 1] = comment
*/
int ms_part(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
{
struct Channel *chptr;
struct Membership *member;
struct JoinBuf parts;
unsigned int flags;
char *p = 0;
char *name;
ClrFlag(sptr, FLAG_TS8);
/* check number of arguments */
if (parc < 2 || parv[1][0] == '\0')
return need_more_params(sptr, "PART");
/* init join/part buffer */
joinbuf_init(&parts, sptr, cptr, JOINBUF_TYPE_PART,
(parc > 2 && !EmptyString(parv[parc - 1])) ? parv[parc - 1] : 0,
0);
/* scan through channel list */
for (name = ircd_strtok(&p, parv[1], ","); name;
name = ircd_strtok(&p, 0, ",")) {
flags = 0;
chptr = get_channel(sptr, name, CGT_NO_CREATE); /* look up channel */
if (!chptr || IsLocalChannel(name) ||
!(member = find_member_link(chptr, sptr)))
continue; /* ignore from remote clients */
if (IsZombie(member)) /* figure out special flags... */
flags |= CHFL_ZOMBIE;
if (IsDelayedJoin(member))
flags |= CHFL_DELAYED;
/* part user from channel */
joinbuf_join(&parts, chptr, flags);
}
return joinbuf_flush(&parts); /* flush channel parts */
}
/** Searches for and handles a 0 in a join list.
* @param[in] cptr Client that sent us the message.
* @param[in] sptr Original source of message.
* @param[in] chanlist List of channels to join.
* @return First token in \a chanlist after the final 0 entry, which
* may be its nul terminator (if the final entry is a 0 entry).
*/
static char *
last0(struct Client *cptr, struct Client *sptr, char *chanlist)
{
char *p;
int join0 = 0;
for (p = chanlist; p[0]; p++) /* find last "JOIN 0" */
if (p[0] == '0' && (p[1] == ',' || p[1] == '\0')) {
if (p[1] == ',')
p++;
chanlist = p + 1;
join0 = 1;
} else {
while (p[0] != ',' && p[0] != '\0') /* skip past channel name */
p++;
if (!p[0]) /* hit the end */
break;
}
if (join0) {
struct JoinBuf part;
struct Membership *member;
joinbuf_init(&part, sptr, cptr, JOINBUF_TYPE_PARTALL,
"Left all channels", 0);
joinbuf_join(&part, 0, 0);
while ((member = cli_user(sptr)->channel))
joinbuf_join(&part, member->channel,
IsZombie(member) ? CHFL_ZOMBIE :
IsDelayedJoin(member) ? CHFL_DELAYED :
0);
joinbuf_flush(&part);
}
return chanlist;
}
/** 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;
}
/** 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;
}
/*
* ms_create - server message handler
*/
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_butone_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 (%s)", cli_name(sptr), chptr->chname);
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).
*/
!(chptr->users == 0 && !chptr->mode.apass[0]))) {
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 */
modebuf_mode_client(&mbuf, MODE_ADD | MODE_CHANOP, sptr, MAXOPLEVEL + 1);
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);
}
}
joinbuf_flush(&join); /* flush out the joins and creates */
joinbuf_flush(&create);
return 0;
}
