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<title> Postfix manual - dnsblog(8) </title>
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DNSBLOG(8) DNSBLOG(8)
<b>NAME</b>
dnsblog - Postfix DNS white/blacklist logger
<b>SYNOPSIS</b>
<b>dnsblog</b> [generic Postfix daemon options]
<b>DESCRIPTION</b>
The <a href="dnsblog.8.html"><b>dnsblog</b>(8)</a> server implements an ad-hoc DNS white/blacklist lookup
service. This may eventually be replaced by an UDP client that is built
directly into the <a href="postscreen.8.html"><b>postscreen</b>(8)</a> server.
<b>PROTOCOL</b>
With each connection, the <a href="dnsblog.8.html"><b>dnsblog</b>(8)</a> server receives a DNS white/black-
list domain name, an IP address, and an ID. If the IP address is
listed under the DNS white/blacklist, the <a href="dnsblog.8.html"><b>dnsblog</b>(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"><b>dnsblog</b>(8)</a>
server closes the connection.
<b>DIAGNOSTICS</b>
Problems and transactions are logged to <b>syslogd</b>(8).
<b>CONFIGURATION PARAMETERS</b>
Changes to <a href="postconf.5.html"><b>main.cf</b></a> are picked up automatically, as <a href="dnsblog.8.html"><b>dnsblog</b>(8)</a> processes
run for only a limited amount of time. Use the command "<b>postfix reload</b>"
to speed up a change.
The text below provides only a parameter summary. See <a href="postconf.5.html"><b>postconf</b>(5)</a> for
more details including examples.
<b><a href="postconf.5.html#config_directory">config_directory</a> (see 'postconf -d' output)</b>
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.
<b><a href="postconf.5.html#daemon_timeout">daemon_timeout</a> (18000s)</b>
How much time a Postfix daemon process may take to handle a
request before it is terminated by a built-in watchdog timer.
<b><a href="postconf.5.html#postscreen_dnsbl_sites">postscreen_dnsbl_sites</a> (empty)</b>
Optional list of DNS white/blacklist domains, filters and weight
factors.
<b><a href="postconf.5.html#ipc_timeout">ipc_timeout</a> (3600s)</b>
The time limit for sending or receiving information over an
internal communication channel.
<b><a href="postconf.5.html#process_id">process_id</a> (read-only)</b>
The process ID of a Postfix command or daemon process.
<b><a href="postconf.5.html#process_name">process_name</a> (read-only)</b>
The process name of a Postfix command or daemon process.
<b><a href="postconf.5.html#queue_directory">queue_directory</a> (see 'postconf -d' output)</b>
The location of the Postfix top-level queue directory.
<b><a href="postconf.5.html#syslog_facility">syslog_facility</a> (mail)</b>
The syslog facility of Postfix logging.
<b><a href="postconf.5.html#syslog_name">syslog_name</a> (see 'postconf -d' output)</b>
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:
<b><a href="postconf.5.html#service_name">service_name</a> (read-only)</b>
The <a href="master.5.html">master.cf</a> service name of a Postfix daemon process.
<b>SEE ALSO</b>
<a href="smtpd.8.html">smtpd(8)</a>, Postfix SMTP server
<a href="postconf.5.html">postconf(5)</a>, configuration parameters
syslogd(5), system logging
<b>LICENSE</b>
The Secure Mailer license must be distributed with this software.
<b>HISTORY</b>
This service was introduced with Postfix version 2.8.
<b>AUTHOR(S)</b>
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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