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DNSBLOG(8) DNSBLOG(8)

<a name="name">NAME</a>
 dnsblog - Postfix DNS allow/denylist logger

<a name="synopsis">SYNOPSIS</a>
 dnsblog [generic Postfix daemon options]

<a name="description">DESCRIPTION</a>
 The <a href="dnsblog.8.html">dnsblog(8)</a> server implements an ad-hoc DNS allow/denylist lookup
 service. This may eventually be replaced by an UDP client that is built
 directly into the <a href="postscreen.8.html">postscreen(8)</a> server.

<a name="protocol">PROTOCOL</a>
 With each connection, the <a href="dnsblog.8.html">dnsblog(8)</a> server receives a DNS
 allow/denylist domain name, an IP address, and an ID. If the IP
 address is listed under the DNS allow/denylist, the <a href="dnsblog.8.html">dnsblog(8)</a> server
 logs the match and replies with the query arguments plus an address
 list with the resulting IP addresses, separated by whitespace, and the
 reply TTL. Otherwise it replies with the query arguments plus an empty
 address list and the reply TTL; the reply TTL is -1 if there is no
 reply, or a negative reply that contains no SOA record. Finally, the
 <a href="dnsblog.8.html">dnsblog(8)</a> server closes the connection.

<a name="diagnostics">DIAGNOSTICS</a>
 Problems and transactions are logged to syslogd(8) or <a href="postlogd.8.html">postlogd(8)</a>.

<a name="configuration_parameters">CONFIGURATION PARAMETERS</a>
 Changes to <a href="postconf.5.html">main.cf</a> are picked up automatically, as <a href="dnsblog.8.html">dnsblog(8)</a> processes
 run for only a limited amount of time. Use the command "postfix reload"
 to speed up a change.

 The text below provides only a parameter summary. See <a href="postconf.5.html">postconf(5)</a> for
 more details including examples.

 <a href="postconf.5.html#config_directory">config_directory</a> (see 'postconf -d' output)
 The default location of the Postfix <a href="postconf.5.html">main.cf</a> and <a href="master.5.html">master.cf</a> con-
 figuration files.

 <a href="postconf.5.html#daemon_timeout">daemon_timeout</a> (18000s)
 How much time a Postfix daemon process may take to handle a
 request before it is terminated by a built-in watchdog timer.

 <a href="postconf.5.html#postscreen_dnsbl_sites">postscreen_dnsbl_sites</a> (empty)
 Optional list of patterns with DNS allow/denylist domains, fil-
 ters and weight factors.

 <a href="postconf.5.html#ipc_timeout">ipc_timeout</a> (3600s)
 The time limit for sending or receiving information over an
 internal communication channel.

 <a href="postconf.5.html#process_id">process_id</a> (read-only)
 The process ID of a Postfix command or daemon process.

 <a href="postconf.5.html#process_name">process_name</a> (read-only)
 The process name of a Postfix command or daemon process.

 <a href="postconf.5.html#queue_directory">queue_directory</a> (see 'postconf -d' output)
 The location of the Postfix top-level queue directory.

 <a href="postconf.5.html#syslog_facility">syslog_facility</a> (mail)
 The syslog facility of Postfix logging.

 <a href="postconf.5.html#syslog_name">syslog_name</a> (see 'postconf -d' output)
 A prefix that is prepended to the process name in syslog
 records, so that, for example, "smtpd" becomes "prefix/smtpd".

 Available in Postfix 3.3 and later:

 <a href="postconf.5.html#service_name">service_name</a> (read-only)
 The <a href="master.5.html">master.cf</a> service name of a Postfix daemon process.

<a name="see_also">SEE ALSO</a>
 <a href="smtpd.8.html">smtpd(8)</a>, Postfix SMTP server
 <a href="postconf.5.html">postconf(5)</a>, configuration parameters
 <a href="postlogd.8.html">postlogd(8)</a>, Postfix logging
 syslogd(8), system logging

<a name="license">LICENSE</a>
 The Secure Mailer license must be distributed with this software.

<a name="history">HISTORY</a>
 This service was introduced with Postfix version 2.8.

AUTHOR(S)
 Wietse Venema
 IBM T.J. Watson Research
 P.O. Box 704
 Yorktown Heights, NY 10598, USA

 Wietse Venema
 Google, Inc.
 111 8th Avenue
 New York, NY 10011, USA

 DNSBLOG(8)
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