solanum-vs-hackint-and-char.../doc/sgml/oper-guide/cmodes.sgml

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<chapter id="cmodes">
<title>Cmodes</title>
<sect1>
<title>Meanings of channel modes</title>
<sect2>
<title>+b, channel ban</title>
<para>
Bans take one parameter which can take several forms.
The most common form is +b nick!user@host.
The wildcards * and ? are allowed, matching zero-or-more, and
exactly-one characters respectively. The masks will be trimmed to fit the maximum allowable
length for the relevant element.
Bans are also checked against the IP address, even if it resolved or
is spoofed.
CIDR is supported, like *!*@10.0.0.0/8. This is most useful with
IPv6.
Bans are not checked against the real hostname behind any kind
of spoof, except if host mangling is in use (e.g.
<filename>extensions/ip_cloaking.so</filename>):
if the user's host is mangled, their real hostname is checked
additionally, and if a user has no spoof but could enable mangling,
the mangled form of their hostname is checked additionally.
Hence, it is not possible to evade bans by toggling
host mangling.
</para>
<para>
The second form (extban) is +b $type or +b $type:data.
type is a single character (case insensitive) indicating the
type of match, optionally preceded by a tilde (~) to negate the
comparison. data depends on type. Each type is loaded as a module.
The available types (if any)
are listed in the EXTBAN token of the 005 (RPL_ISUPPORT) numeric.
See <filename>doc/extban.txt</filename> in the source distribution
for more information.
</para>
<para>
If no parameter is given, the list of bans is returned. All users
can use this form. The plus sign should also be omitted.
</para>
<para>
Matching users will not be allowed to join the channel or knock
on it. If they are already on the channel, they may not send to
it or change their nick.
</para>
</sect2>
<sect2>
<title>+c, colour filter</title>
<para>
This cmode activates the colour filter for the channel. This filters out bold, underline,
reverse video, beeps, mIRC colour codes, and ANSI escapes. Note that escape sequences will
usually leave cruft sent to the channel, just without the escape characters themselves.
</para>
</sect2>
<sect2>
<title>+e, ban exemption</title>
<para>
This mode takes one parameter of the same form as bans, which
overrides +b and +q bans for all clients it matches.
</para>
<para>
This can be useful if it is necessary to ban an entire ISP
due to persistent abuse, but some users from that ISP should
still be allowed in. For example:
/mode #channel +be *!*@*.example.com *!*someuser@host3.example.com
</para>
<para>
Only channel operators can see +e changes or request the list.
</para>
</sect2>
<sect2>
<title>+f, channel forwarding</title>
<para>
This mode takes one parameter, the name of a channel (+f #channel). If the channel also has the
+i cmode set, and somebody attempts to join without either being expliticly invited, or having
an invex (+I), then they will instead join the channel named in the mode parameter. The client
will also be sent a 470 numeric giving the original and target channels.
</para>
<para>
Users are similarly forwarded if the +j cmode is set and their attempt to join is throttled,
if +l is set and there are already too many users in the channel
or if +r is set and they are not identified.
</para>
<para>
Forwards may only be set to +F channels, or to channels the setter
has ops in.
</para>
<para>
Without parameter (/mode #channel f or /mode #channel +f) the
forward channel is returned. This form also works off channel.
</para>
</sect2>
<sect2>
<title>+F, allow anybody to forward to this</title>
<para>
When this mode is set, anybody may set a forward from a channel
they have ops in to this channel. Otherwise they have to have ops
in this channel.
</para>
</sect2>
<sect2>
<title>+g, allow anybody to invite</title>
<para>
When this mode is set, anybody may use the INVITE command on the channel in question. When it
is unset, only channel operators may use the INVITE command.
</para>
<para>
When this mode is set together with +i, +j, +l or +r, all channel members can influence who can join.
</para>
</sect2>
<sect2>
<title>+i, invite only</title>
<para>
When this cmode is set, no client can join the channel unless they have an invex (+I) or are
invited with the INVITE command.
</para>
</sect2>
<sect2>
<title>+I, invite exception (invex)</title>
<para>
This mode takes one parameter of the same form as bans. Matching
clients do not need to be invited to join the channel when it is invite-only (+i).
Unlike the INVITE command, this does not override +j, +l and +r.
</para>
<para>
Only channel operators can see +I changes or request the list.
</para>
</sect2>
<sect2>
<title>+j, join throttling</title>
<para>
This mode takes one parameter of the form <replaceable>n</replaceable>:<replaceable>t</replaceable>, where <replaceable>n</replaceable> and <replaceable>t</replaceable> are positive integers. Only <replaceable>n</replaceable> users may join in each period of <replaceable>t</replaceable> seconds.
</para>
<para>
Invited users can join regardless of +j, but are counted as normal.
</para>
<para>
Due to propagation delays between servers, more users may be
able to join (by racing for the last slot on each server).
</para>
</sect2>
<sect2>
<title>+k, key (channel password)</title>
<para>
Taking one parameter, when set, this mode requires a user to supply the key in order to join
the channel: /JOIN #channel key.
</para>
</sect2>
<sect2>
<title>+l, channel member limit</title>
<para>
Takes one numeric parameter, the number of users which are allowed to be in the channel before
further joins are blocked.
Invited users may join regardless.
</para>
<para>
Due to propagation delays between servers, more users may be
able to join (by racing for the last slot on each server).
</para>
</sect2>
<sect2>
<title>+L, large ban list</title>
<para>
Channels with this mode will be allowed larger banlists (by default,
500 instead of 50 entries for +b, +q, +e and +I together).
Only network operators may set this mode.
</para>
</sect2>
<sect2>
<title>+m, moderated</title>
<para>
When a channel is set +m, only users with +o or +v on the channel can send to it.
</para>
<para>
Users can still knock on the channel or change their nick.
</para>
</sect2>
<sect2>
<title>+n, no external messages</title>
<para>
When set, this mode prevents users from sending to the channel without being in it themselves.
This is recommended.
</para>
</sect2>
<sect2>
<title>+o, channel operator</title>
<para>
This mode takes one parameter, a nick, and grants or removes channel
operator privilege to that user. Channel operators have full control
over the channel, having the ability to set all channel modes except
+L and +P, and kick users.
Like voiced users, channel operators can always
send to the channel, overriding +b, +m and +q modes and the
per-channel flood limit.
In most clients channel operators are marked with an '@' sign.
</para>
<para>
The privilege is lost if the user leaves the channel or server
in any way.
</para>
<para>
Most networks will run channel registration services (e.g. ChanServ)
which ensure the founder (and users designated by the founder) can
always gain channel operator privileges and provide some features
to manage the channel.
</para>
</sect2>
<sect2>
<title>+p, paranoid channel</title>
<para>
When set, the KNOCK command cannot be used on the channel
to request an invite, and users will not be shown the
channel in WHOIS replies unless they are on it.
Unlike in traditional IRC, +p and +s can be set together.
</para>
</sect2>
<sect2>
<title>+P, permanent channel</title>
<para>
Channels with this mode (which is accessible only to network operators) set will not be destroyed
when the last user leaves.
</para>
<para>
This makes it less likely modes, bans and the topic will be lost and
makes it harder to abuse network splits, but also causes more
unwanted restoring of old modes, bans and topics after long splits.
</para>
</sect2>
<sect2>
<title>+q, quiet</title>
<para>
This mode behaves exactly like +b (ban), except that the user may still join
the channel. The net effect is that they cannot knock on the channel,
send to the channel or change their nick while on channel.
</para>
</sect2>
<sect2>
<title>+Q, block forwarded users</title>
<para>
Channels with this mode set are not valid targets for forwarding. Any attempt to forward to
this channel will be ignored, and the user will be handled as if the attempt was never made (by
sending them the relevant error message).
</para>
<para>
This does not affect the ability to set +f.
</para>
</sect2>
<sect2>
<title>+r, block unidentified</title>
<para>
When set, this mode prevents unidentified users from joining.
Invited users can still join.
</para>
</sect2>
<!-- not planned (jilles)
<sect2>
<title>+R, quiet unidentified</title>
<para>
When set, this mode prevents unidentified users from sending to the channel, although they can
still join.
</para>
<para>
Please note that this mode is not implemented in Charybdis 1.0.x, and is documented in
expectation for upcoming Charybdis 1.1.
</para>
</sect2>
-->
<sect2>
<title>+s, secret channel</title>
<para>
When set, this mode prevents the channel from appearing in the
output of the LIST, WHO and WHOIS command by users who are not on
it. Also, the server will refuse to answer WHO, NAMES, TOPIC and
LIST queries from users not on the channel.
</para>
</sect2>
<sect2>
<title>+t, topic limit</title>
<para>
When set, this mode prevents users who are not channel operators
from changing the topic.
</para>
</sect2>
<sect2>
<title>+v, voice</title>
<para>
This mode takes one parameter, a nick, and grants or removes voice
privilege to that user. Voiced users can always send to the channel,
overriding +b, +m and +q modes and the per-channel flood limit.
In most clients voiced users are marked with a plus sign.
</para>
<para>
The privilege is lost if the user leaves the channel or server
in any way.
</para>
</sect2>
<sect2>
<title>+z, reduced moderation</title>
<para>
When +z is set, the effects of +m are relaxed. For each message, if that message
would normally be blocked by moderation, it is instead sent to all channel operators. This is intended for use in moderated debates.
</para>
<para>
Note that +n and channel bans/quiets are unaffected by this. To silence a given user completely,
remove them from the channel.
</para>
</sect2>
</sect1>
</chapter>
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