  <chapter id="config">
    <title>Server config file format</title>
    <sect1>
      <title>General format</title>
      <para>
	The config file consists of a series of BIND-style blocks. Each block consists of a series
	of values inside it which pertain to configuration settings that apply to the given block.
      </para>
      <para>
	Several values take lists of values and have defaults preset inside
	them. Prefix a keyword with a tilde (~) to override the default and
	disable it.
      </para>
      <para>
	A line may also be a .include directive, which is of the form <synopsis>.include "<replaceable>file</replaceable>"</synopsis>
	and causes <replaceable>file</replaceable> to be read in at that point, before the rest of the current file is
	processed.
	Relative paths are first tried relative to PREFIX and then relative
	to ETCPATH (normally PREFIX/etc).
      </para>
      <para>
	Anything from a # to the end of a line is a comment. Blank lines are ignored. C-style comments are also supported.
      </para>
    </sect1>
    <sect1 id="configlines">
      <title>Specific blocks and directives</title>
      <para>
       Not all configuration blocks and directives are listed here, only the most common ones. More blocks and directives will
       be documented in later revisions of this manual.
      </para>
      <sect2>
	<title>loadmodule directive</title>
	<synopsis>
loadmodule "<replaceable>text</replaceable>";</synopsis>
	<para>
	  Loads a module into the IRCd. In charybdis 1.1, most modules are automatically loaded in. In future versions, it is
	  intended to remove this behaviour as to allow for easy customization of the IRCd's featureset.
	</para>
      </sect2>
      <sect2>
	<title>serverinfo {} block</title>
	<synopsis>
serverinfo {
        name = "<replaceable>text</replaceable>";
        sid = "<replaceable>text</replaceable>";
        description = "<replaceable>text</replaceable>";
        network_name = "<replaceable>text</replaceable>";
        network_desc = "<replaceable>text</replaceable>";
        hub = <replaceable>boolean</replaceable>;
        vhost = "<replaceable>text</replaceable>";
        vhost6 = "<replaceable>text</replaceable>";
};</synopsis>
	<para>
	  The serverinfo {} block defines the core operational parameters of the IRC server.
	</para>
	<variablelist>
	  <title>serverinfo {} variables</title>
	  <varlistentry>
	    <term>name</term>
	    <listitem>
	      <para>
		The name of the IRC server that you are configuring. This
		must contain at least one dot. It is not necessarily equal
		to any DNS name. This must be unique on the IRC network.
	      </para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>sid</term>
	    <listitem>
	      <para>
                A unique ID which describes the server.
		This consists of one digit and two characters which can be
		digits or letters.
	      </para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>description</term>
	    <listitem>
	      <para>
		A user-defined field of text which describes the IRC server. This information is used in
		/links and /whois requests. Geographical location information could be a useful use of
		this field, but most administrators put a witty saying inside it instead.
	      </para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>network_name</term>
	    <listitem>
	      <para>
		The name of the IRC network that this server will be a member of.
		This is used in the welcome message and NETWORK= in 005.
	      </para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>network_desc</term>
	    <listitem>
	      <para>
		A description of the IRC network that this server will be a member of.
		This is currently unused.
	      </para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>hub</term>
	    <listitem>
	      <para>
		A boolean which defines whether or not this IRC server will be serving as a hub, i.e. have multiple servers connected to it.
	      </para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>vhost</term>
	    <listitem>
	      <para>
		An optional text field which defines an IP from which to connect outward to other IRC servers.
	      </para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>vhost6</term>
	    <listitem>
	      <para>
		An optional text field which defines an IPv6 IP from which to connect outward to other IRC servers.
	      </para>
	    </listitem>
	  </varlistentry>
	</variablelist>
      </sect2>
      <sect2>
	<title>admin {} block</title>
	<synopsis>
admin {
	name = "<replaceable>text</replaceable>";
	description = "<replaceable>text</replaceable>";
	email = "<replaceable>text</replaceable>";
};</synopsis>
	<para>
	  This block provides the information which is returned by the ADMIN command.
	</para>
	<variablelist>
	  <title>admin {} variables</title>
	  <varlistentry>
	    <term>name</term>
	    <listitem>
	      <para>The name of the administrator running this service.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>description</term>
	    <listitem>
	      <para>The description of the administrator's position in the network.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>email</term>
	    <listitem>
	      <para>A point of contact for the administrator, usually an e-mail address.</para>
	    </listitem>
	  </varlistentry>
	</variablelist>
      </sect2>
      <sect2>
	<title>class {} block</title>
	<synopsis>
class "<replaceable>name</replaceable>" {
        ping_time = <replaceable>duration</replaceable>;
        number_per_ident = <replaceable>number</replaceable>;
        number_per_ip = <replaceable>number</replaceable>;
        number_per_ip_global = <replaceable>number</replaceable>;
        cidr_ipv4_bitlen = <replaceable>number</replaceable>;
        cidr_ipv6_bitlen = <replaceable>number</replaceable>;
        number_per_cidr = <replaceable>number</replaceable>;
        max_number = <replaceable>number</replaceable>;
        sendq = <replaceable>size</replaceable>;
};</synopsis>
	<synopsis>
class "<replaceable>name</replaceable>" {
        ping_time = <replaceable>duration</replaceable>;
        connectfreq = <replaceable>duration</replaceable>;
        max_number = <replaceable>number</replaceable>;
        sendq = <replaceable>size</replaceable>;
};</synopsis>
	<para>
	  Class blocks define classes of connections for later use.
	  The class name is used to connect them to
	  other blocks in the config file (auth{} and connect{}).
	  They must be defined before they are used.
	</para>
	<para>
	  Classes are used both for client and server connections,
	  but most variables are different.
	</para>
	<variablelist>
	  <title>class {} variables: client classes</title>
	  <varlistentry>
	    <term>ping_time</term>
	    <listitem>
	      <para>The amount of time between checking pings for clients, e.g.: 2 minutes</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>number_per_ident</term>
	    <listitem>
	      <para>The amount of clients which may be connected from a single identd username on a per-IP basis, globally. Unidented clients all count as the same username.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>number_per_ip</term>
	    <listitem>
	      <para>The amount of clients which may be connected from a single IP address.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>number_per_ip_global</term>
	    <listitem>
	      <para>The amount of clients which may be connected globally from a single IP address.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>cidr_ipv4_bitlen</term>
	    <listitem>
	      <para>The netblock length to use with CIDR-based client limiting for IPv4 users in this class (between 0 and 32).</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>cidr_ipv6_bitlen</term>
	    <listitem>
	      <para>The netblock length to use with CIDR-based client limiting for IPv6 users in this class (between 0 and 128).</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>number_per_cidr</term>
	    <listitem>
	      <para>The amount of clients which may be connected from a single netblock.</para>
	      <para>If this needs to differ between IPv4 and IPv6, make different classes for IPv4 and IPv6 users.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>max_number</term>
	    <listitem>
	      <para>The maximum amount of clients which may use this class at any given time.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>sendq</term>
	    <listitem>
	      <para>The maximum size of the queue of data to be sent to a client before it is dropped.</para>
	    </listitem>
	  </varlistentry>
	</variablelist>
	<variablelist>
	  <title>class {} variables: server classes</title>
	  <varlistentry>
	    <term>ping_time</term>
	    <listitem>
	      <para>The amount of time between checking pings for servers, e.g.: 2 minutes</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>connectfreq</term>
	    <listitem>
	      <para>The amount of time between autoconnects. This must at least be one minute, as autoconnects are evaluated with that granularity.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>max_number</term>
	    <listitem>
	      <para>The amount of servers to autoconnect to in this class. More precisely, no autoconnects are done if the number of servers in this class is greater than or equal max_number</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>sendq</term>
	    <listitem>
	      <para>The maximum size of the queue of data to be sent to a server before it is dropped.</para>
	    </listitem>
	  </varlistentry>
	</variablelist>
      </sect2>
      <sect2>
	<title>auth {} block</title>
	<synopsis>
auth {
	user = "<replaceable>hostmask</replaceable>";
	password = "<replaceable>text</replaceable>";
	spoof = "<replaceable>text</replaceable>";
	flags = <replaceable>list</replaceable>;
	class = "<replaceable>text</replaceable>";
};</synopsis>
	<para>
	  auth {} blocks allow client connections to the server, and set various properties concerning those connections.
	</para>
        <para>
          Auth blocks are evaluated from top to bottom in priority, so put special blocks first.
        </para>
	<variablelist>
	  <title>auth {} variables</title>
	  <varlistentry>
            <term>user</term>
            <listitem>
              <para>
                A hostmask (user@host) that the auth {} block applies to.
                It is matched against the hostname and IP address (using ::
                shortening for IPv6 and prepending a 0 if it starts with
                a colon) and can also use CIDR masks.
                You can have multiple user entries.
              </para>
            </listitem>
          </varlistentry>
	  <varlistentry>
            <term>password</term>
            <listitem>
              <para>
		An optional password to use for authenticating into this auth{}
		block.  If the password is wrong the user will not be able to
		connect (will not fall back on another auth{} block).
	      </para>
            </listitem>
          </varlistentry>
	  <varlistentry>
            <term>spoof</term>
            <listitem>
              <para>An optional fake hostname (or user@host) to apply to users authenticated to this auth{} block. In STATS i and TESTLINE, an equals sign (=) appears before the user@host and the spoof is shown.</para>
            </listitem>
          </varlistentry>
	  <varlistentry>
            <term>flags</term>
            <listitem>
              <para>A list of flags to apply to this auth{} block. They are listed below. Some of the flags appear as a special character, parenthesized in the list, before the user@host in STATS i and TESTLINE.</para>
            </listitem>
          </varlistentry>
	  <varlistentry>
            <term>class</term>
            <listitem>
              <para>A name of a class to put users matching this auth{} block into.</para>
            </listitem>
          </varlistentry>
        </variablelist>
	<variablelist>
	  <title>auth {} flags</title>
	  <varlistentry>
	    <term>encrypted</term>
	    <listitem>
	      <para>The password used has been encrypted.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>spoof_notice</term>
	    <listitem>
	      <para>Causes the IRCd to send out a server notice when activating a spoof provided by this auth{} block.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>exceed_limit (&gt;)</term>
	    <listitem>
	      <para>Users in this auth{} block can exceed class-wide limitations.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>dnsbl_exempt ($)</term>
	    <listitem>
	      <para>Users in this auth{} block are exempted from DNS blacklist checks. However, they will still be warned if they are listed.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>kline_exempt (^)</term>
	    <listitem>
	      <para>Users in this auth{} block are exempted from DNS blacklists, k:lines and x:lines.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>spambot_exempt</term>
	    <listitem>
	      <para>Users in this auth{} block are exempted from spambot checks.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>shide_exempt</term>
	    <listitem>
	      <para>Users in this auth{} block are exempted from some serverhiding effects.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>jupe_exempt</term>
	    <listitem>
	      <para>Users in this auth{} block do not trigger an alarm when joining juped channels.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>resv_exempt</term>
	    <listitem>
	      <para>Users in this auth{} block may use reserved nicknames and channels.</para>
	      <note><para>The initial nickname may still not be reserved.</para></note>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>flood_exempt (|)</term>
	    <listitem>
	      <para>
                Users in this auth{} block may send arbitrary amounts of
		commands per time unit to the server. This does not exempt
		them from any other flood limits.
                You should use this setting with caution.
              </para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>no_tilde (-)</term>
	    <listitem>
	      <para>Users in this auth{} block will not have a tilde added to their username if they do not run identd.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>need_ident (+)</term>
	    <listitem>
	      <para>Users in this auth{} block must have identd, otherwise they will be rejected.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>need_ssl</term>
	    <listitem>
	      <para>Users in this auth{} block must be connected via SSL/TLS, otherwise they will be rejected.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>need_sasl</term>
	    <listitem>
	      <para>Users in this auth{} block must identify via SASL, otherwise they will be rejected.</para>
	    </listitem>
	  </varlistentry>
	</variablelist>
      </sect2>
      <sect2>
	<title>exempt {} block</title>
	<synopsis>
exempt {
	ip = "<replaceable>ip</replaceable>";
};</synopsis>
	<para>
	  An exempt block specifies IP addresses which are exempt from D:lines
	  and throttling.
	  Multiple addresses can be specified in one block.
	  Clients coming from these addresses can still be K/G/X:lined or
	  banned by a DNS blacklist unless
	  they also have appropriate flags in their auth{} block.
	</para>
	<variablelist>
	  <title>exempt {} variables</title>
	  <varlistentry>
	    <term>ip</term>
	    <listitem>
	      <para>The IP address or CIDR range to exempt.</para>
	    </listitem>
	  </varlistentry>
	</variablelist>
      </sect2>
      <sect2>
	<title>privset {} block</title>
	<synopsis>
privset {
	extends = "<replaceable>name</replaceable>";
	privs = <replaceable>list</replaceable>;
};</synopsis>
	<para>
	  A privset (privilege set) block specifies a set of
	  operator privileges.
	</para>
	<variablelist>
	  <title>privset {} variables</title>
	  <varlistentry>
	    <term>extends</term>
	    <listitem>
	      <para>An optional privset to inherit. The new privset will have all privileges that the given privset has.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>privs</term>
	    <listitem>
	      <para>Privileges to grant to this privset. These are described in the operator privileges section.</para>
	    </listitem>
	  </varlistentry>
	</variablelist>
      </sect2>
      <sect2>
	<title>operator {} block</title>
	<synopsis>
operator "<replaceable>name</replaceable>" {
	user = "<replaceable>hostmask</replaceable>";
	password = "<replaceable>text</replaceable>";
	rsa_public_key_file = "<replaceable>text</replaceable>";
	umodes = <replaceable>list</replaceable>;
	snomask = "<replaceable>text</replaceable>";
	flags = <replaceable>list</replaceable>;
};</synopsis>
	<para>
	  Operator blocks define who may use the OPER command to gain extended privileges.
	</para>
        <variablelist>
          <title>operator {} variables</title>
	  <varlistentry>
	    <term>user</term>
	    <listitem>
	      <para>
		A hostmask that users trying to use this operator {} block
		must match. This is checked against the original host and IP
		address; CIDR is also supported. So auth {} spoofs work in
		operator {} blocks; the real host behind them is not checked.
		Other kind of spoofs do not work in operator {} blocks; the
		real host behind them is checked.
	      </para>
	      <para>
		Note that this is different from charybdis 1.x where all
		kinds of spoofs worked in operator {} blocks.
	      </para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>password</term>
	    <listitem>
              <para>
		A password used with the OPER command to use this operator {} block.
		Passwords are encrypted by default, but may be unencrypted if ~encrypted is present
		in the flags list.
	      </para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>rsa_public_key_file</term>
	    <listitem>
              <para>
		An optional path to a RSA public key file associated with the operator {} block.
		This information is used by the CHALLENGE command, which is an alternative authentication
		scheme to the traditional OPER command.
	      </para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>umodes</term>
	    <listitem>
              <para>A list of usermodes to apply to successfully opered clients.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>snomask</term>
	    <listitem>
              <para>
		An snomask to apply to successfully opered clients.
	      </para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>privset</term>
	    <listitem>
              <para>
		The privilege set granted to successfully opered clients.
		This must be defined before this operator{} block.
	      </para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>flags</term>
	    <listitem>
              <para>A list of flags to apply to this operator{} block. They are listed below.</para>
	    </listitem>
	  </varlistentry>
	</variablelist>
	<variablelist>
	  <title>operator {} flags</title>
	  <varlistentry>
	    <term>encrypted</term>
	    <listitem>
	      <para>The password used has been encrypted. This is enabled by default, use ~encrypted to disable it.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>need_ssl</term>
	    <listitem>
	      <para>Restricts use of this operator{} block to SSL/TLS connections only.</para>
	    </listitem>
	  </varlistentry>
	</variablelist>
      </sect2>
      <sect2>
	<title>connect {} block</title>
	<synopsis>
connect "<replaceable>name</replaceable>" {
	host = "<replaceable>text</replaceable>";
	send_password = "<replaceable>text</replaceable>";
	accept_password = "<replaceable>text</replaceable>";
	port = <replaceable>number</replaceable>;
	hub_mask = "<replaceable>mask</replaceable>";
	leaf_mask = "<replaceable>mask</replaceable>";
	class = "<replaceable>text</replaceable>";
	flags = <replaceable>list</replaceable>;
	aftype = <replaceable>protocol</replaceable>;
};</synopsis>
	<para>
	  Connect blocks define what servers may connect or be connected to.
	</para>
	<variablelist>
	  <title>connect {} variables</title>
	  <varlistentry>
	    <term>host</term>
	    <listitem>
	      <para>The hostname or IP to connect to.</para>
	      <note><para>
		Furthermore, if a hostname is used, it must have an A or AAAA
		record (no CNAME) and it must be the primary
		hostname for inbound connections to work.
	      </para><para>
	        IPv6 addresses must be in :: shortened form; addresses which
		then start with a colon must be prepended with a zero,
		for example 0::1.
	      </para></note>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>send_password</term>
	    <listitem>
	      <para>The password to send to the other server.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>accept_password</term>
	    <listitem>
	      <para>The password that should be accepted from the other server.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>port</term>
	    <listitem>
	      <para>The port on the other server to connect to.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>hub_mask</term>
	    <listitem>
	      <para>
		An optional domain mask of servers allowed to be introduced
		by this link. Usually, "*" is fine. Multiple hub_masks may be
		specified, and any of them may be introduced.
		Violation of hub_mask and leaf_mask restrictions will
		cause the local link to be closed.
	      </para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>leaf_mask</term>
	    <listitem>
	      <para>
		An optional domain mask of servers not allowed to be
		introduced by this link. Multiple leaf_masks may be specified,
		and none of them may be introduced. leaf_mask has priority
		over hub_mask.
	      </para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>class</term>
	    <listitem>
	      <para>The name of the class this server should be placed into.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>flags</term>
	    <listitem>
	      <para>A list of flags concerning the connect block. They are listed below.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>aftype</term>
	    <listitem>
	      <para>The protocol that should be used to connect with, either ipv4 or ipv6. This defaults to ipv4 unless host is a numeric IPv6 address.</para>
	    </listitem>
	  </varlistentry>
	</variablelist>
	<variablelist>
	  <title>connect {} flags</title>
	  <varlistentry>
	    <term>encrypted</term>
	    <listitem>
	      <para>The value for accept_password has been encrypted.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>autoconn</term>
	    <listitem>
	      <para>
		The server should automatically try to connect to the server defined in this 
		connect {} block if it's not connected already and max_number
		in the class is not reached yet.
              </para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>compressed</term>
	    <listitem>
	      <para>Ziplinks should be used with this server connection.
	      This compresses traffic using zlib, saving some bandwidth
	      and speeding up netbursts.</para>
	      <para>If you have trouble setting up a link, you should
	      turn this off as it often hides error messages.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>topicburst</term>
	    <listitem>
	      <para>Topics should be bursted to this server.</para>
	      <para>This is enabled by default.</para>
	    </listitem>
	  </varlistentry>
	</variablelist>
      </sect2>
      <sect2>
	<title>listen {} block</title>
	<synopsis>
listen {
	host = "<replaceable>text</replaceable>";
	port = <replaceable>number</replaceable>;
};</synopsis>
	<para>
	  A listen block specifies what ports a server should listen on.
	</para>
	<variablelist>
	  <title>listen {} variables</title>
	  <varlistentry>
	    <term>host</term>
	    <listitem>
	      <para>An optional host to bind to. Otherwise, the ircd will listen on all available hosts.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>port</term>
	    <listitem>
	      <para>
		A port to listen on. You can specify multiple ports via commas, and define a range by seperating
		the start and end ports with two dots (..).
	      </para>
	    </listitem>
	  </varlistentry>
	</variablelist>
      </sect2>
      <sect2>
	<title>modules {} block</title>
	<synopsis>
modules {
	path = "<replaceable>text</replaceable>";
	module = <replaceable>text</replaceable>;
};</synopsis>
	<para>
	  The modules block specifies information for loadable modules.
	</para>
	<variablelist>
	  <title>modules {} variables</title>
	  <varlistentry>
	    <term>path</term>
	    <listitem>
	      <para>Specifies a path to search for loadable modules.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>module</term>
	    <listitem>
	      <para>
		Specifies a module to load, similar to loadmodule.
	      </para>
	    </listitem>
	  </varlistentry>
	</variablelist>
      </sect2>
      <sect2>
	<title>general {} block</title>
	<synopsis>
modules {
	<replaceable>values</replaceable>
};</synopsis>
	<para>
	  The general block specifies a variety of options, many of which
	  were in <filename>config.h</filename> in older daemons.
	  The options are documented in <filename>reference.conf</filename>.
	</para>
      </sect2>
      <sect2>
	<title>channel {} block</title>
	<synopsis>
modules {
	<replaceable>values</replaceable>
};</synopsis>
	<para>
	  The channel block specifies a variety of channel-related options,
	  many of which were in <filename>config.h</filename> in older daemons.
	  The options are documented in <filename>reference.conf</filename>.
	</para>
      </sect2>
      <sect2>
	<title>serverhide {} block</title>
	<synopsis>
modules {
	<replaceable>values</replaceable>
};</synopsis>
	<para>
	  The serverhide block specifies options related to server hiding.
	  The options are documented in <filename>reference.conf</filename>.
	</para>
      </sect2>
      <sect2>
	<title>blacklist {} block</title>
	<synopsis>
blacklist {
	host = "<replaceable>text</replaceable>";
	reject_reason = "<replaceable>text</replaceable>";
};</synopsis>
	<para>
	  The blacklist block specifies DNS blacklists to check.
	  Listed clients will not be allowed to connect.
	  IPv6 clients are not checked against these.
	</para>
	<para>
	  Multiple blacklists can be specified, in pairs with first host
	  then reject_reason.
	</para>
	<variablelist>
	  <title>blacklist {} variables</title>
	  <varlistentry>
	    <term>host</term>
	    <listitem>
	      <para>The DNSBL to use.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>reject_reason</term>
	    <listitem>
	      <para>The reason to send to listed clients when disconnecting them.</para>
	    </listitem>
	  </varlistentry>
	</variablelist>
      </sect2>
      <sect2>
	<title>alias {} block</title>
	<synopsis>
alias "<replaceable>name</replaceable>" {
	target = "<replaceable>text</replaceable>";
};</synopsis>
	<para>
	  Alias blocks allow the definition of custom commands.
	  These commands send PRIVMSG to the given target. A real
	  command takes precedence above an alias.
	</para>
	<variablelist>
	  <title>alias {} variables</title>
	  <varlistentry>
	    <term>target</term>
	    <listitem>
	      <para>
		The target nick (must be a network service (umode +S)) or
		user@server.
		In the latter case, the server cannot be this server,
		only opers can use user starting with "opers" reliably and
		the user is interpreted on the target server only
		so you may need to use nick@server instead).
	      </para>
	    </listitem>
	  </varlistentry>
	</variablelist>
      </sect2>
      <sect2>
	<title>cluster {} block</title>
	<synopsis>
cluster {
	name = "<replaceable>text</replaceable>";
	flags = <replaceable>list</replaceable>;
};</synopsis>
	<para>
	  The cluster block specifies servers we propagate things to
	  automatically.
	  This does not allow them to set bans, you need a separate shared{}
	  block for that.
	</para>
	<para>
	  Having overlapping cluster{} items will cause the command to
	  be executed twice on the target servers. This is particularly
	  undesirable for ban removals.
	</para>
	<para>
	  The letters in parentheses denote the flags in /stats U.
	</para>
	<variablelist>
	  <title>cluster {} variables</title>
	  <varlistentry>
	    <term>name</term>
	    <listitem>
	      <para>The server name to share with, this may contain wildcards
	      and may be stacked.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>flags</term>
	    <listitem>
	      <para>The list of what to share, all the name lines above this
	      (up to another flags entry) will receive these flags.
	      They are listed below.</para>
	    </listitem>
	  </varlistentry>
	</variablelist>
	<variablelist>
	  <title>cluster {} flags</title>
	  <varlistentry>
	    <term>kline (K)</term>
	    <listitem>
	      <para>Permanent K:lines</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>tkline (k)</term>
	    <listitem>
	      <para>Temporary K:lines</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>unkline (U)</term>
	    <listitem>
	      <para>K:line removals</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>xline (X)</term>
	    <listitem>
	      <para>Permanent X:lines</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>txline (x)</term>
	    <listitem>
	      <para>Temporary X:lines</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>unxline (Y)</term>
	    <listitem>
	      <para>X:line removals</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>resv (Q)</term>
	    <listitem>
	      <para>Permanently reserved nicks/channels</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>tresv (q)</term>
	    <listitem>
	      <para>Temporarily reserved nicks/channels</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>unresv (R)</term>
	    <listitem>
	      <para>RESV removals</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>locops (L)</term>
	    <listitem>
	      <para>LOCOPS messages (sharing this with * makes LOCOPS rather
	      similar to OPERWALL which is not useful)</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>all</term>
	    <listitem>
	      <para>All of the above</para>
	    </listitem>
	  </varlistentry>
	</variablelist>
      </sect2>
      <sect2>
	<title>shared {} block</title>
	<synopsis>
shared {
	oper = "<replaceable>user@host</replaceable>", "<replaceable>server</replaceable>";
	flags = <replaceable>list</replaceable>;
};</synopsis>
	<para>
	  The shared block specifies opers allowed to perform certain actions
	  on our server remotely.
	  These are ordered top down. The first one matching will determine
	  the oper's access.
	  If access is denied, the command will be silently ignored.
	</para>
	<para>
	  The letters in parentheses denote the flags in /stats U.
	</para>
	<variablelist>
	  <title>shared {} variables</title>
	  <varlistentry>
	    <term>oper</term>
	    <listitem>
	      <para>The user@host the oper must have, and the server they must
	      be on. This may contain wildcards.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>flags</term>
	    <listitem>
	      <para>The list of what to allow, all the oper lines above this
	      (up to another flags entry) will receive these flags.
	      They are listed below.</para>
	    </listitem>
	  </varlistentry>
	</variablelist>
	<note><para>
	  While they have the same names, the flags have subtly different
	  meanings from those in the cluster{} block.
	</para></note>
	<variablelist>
	  <title>shared {} flags</title>
	  <varlistentry>
	    <term>kline (K)</term>
	    <listitem>
	      <para>Permanent and temporary K:lines</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>tkline (k)</term>
	    <listitem>
	      <para>Temporary K:lines</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>unkline (U)</term>
	    <listitem>
	      <para>K:line removals</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>xline (X)</term>
	    <listitem>
	      <para>Permanent and temporary X:lines</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>txline (x)</term>
	    <listitem>
	      <para>Temporary X:lines</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>unxline (Y)</term>
	    <listitem>
	      <para>X:line removals</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>resv (Q)</term>
	    <listitem>
	      <para>Permanently and temporarily reserved nicks/channels</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>tresv (q)</term>
	    <listitem>
	      <para>Temporarily reserved nicks/channels</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>unresv (R)</term>
	    <listitem>
	      <para>RESV removals</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>all</term>
	    <listitem>
	      <para>All of the above; this does not include locops, rehash, dline, tdline or undline.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>locops (L)</term>
	    <listitem>
	      <para>LOCOPS messages (accepting this from * makes LOCOPS rather
	      similar to OPERWALL which is not useful); unlike the other flags,
	      this can only be accepted from *@* although it can be
	      restricted based on source server.</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>rehash (H)</term>
	    <listitem>
	      <para>REHASH commands; all options can be used</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>dline (D)</term>
	    <listitem>
	      <para>Permanent and temporary D:lines</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>tdline (d)</term>
	    <listitem>
	      <para>Temporary D:lines</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>undline (E)</term>
	    <listitem>
	      <para>D:line removals</para>
	    </listitem>
	  </varlistentry>
	  <varlistentry>
	    <term>none</term>
	    <listitem>
	      <para>Allow nothing to be done</para>
	    </listitem>
	  </varlistentry>
	</variablelist>
      </sect2>
      <sect2>
	<title>service {} block</title>
	<synopsis>
service {
	name = "<replaceable>text</replaceable>";
};</synopsis>
	<para>
	  The service block specifies privileged servers (services). These
	  servers have extra privileges such as setting login names on users
	  and introducing clients with umode +S (unkickable, hide channels, etc).
	  This does not allow them to set bans, you need a separate shared{}
	  block for that.
	</para>
	<para>
	  Do not place normal servers here.
	</para>
	<para>
	  Multiple names may be specified but there may be only one service{}
	  block.
	</para>
	<variablelist>
	  <title>service {} variables</title>
	  <varlistentry>
	    <term>name</term>
	    <listitem>
	      <para>The server name to grant special privileges. This may not
	      contain wildcards.</para>
	    </listitem>
	  </varlistentry>
	</variablelist>
      </sect2>
    </sect1>
    <sect1>
      <title>Hostname resolution (DNS)</title>
      <para>
	Charybdis uses solely DNS for all hostname/address lookups
	(no <filename>/etc/hosts</filename> or anything else).
	The DNS servers are taken from <filename>/etc/resolv.conf</filename>.
	If this file does not exist or no valid IP addresses are listed in it,
	the local host (127.0.0.1) is used. (Note that the latter part
	did not work in older versions of Charybdis.)
      </para>
      <para>
	IPv4 as well as IPv6 DNS servers are supported, but it is not
	possible to use both IPv4 and IPv6 in
	<filename>/etc/resolv.conf</filename>.
      </para>
      <para>
	For both security and performance reasons, it is recommended
	that a caching nameserver such as BIND be run on the same machine
	as Charybdis and that <filename>/etc/resolv.conf</filename> only
	list 127.0.0.1.
      </para>
    </sect1>
  </chapter>
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