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DNSBLOG(8)		    System Manager's Manual		    DNSBLOG(8)

NAME
       dnsblog - Postfix DNS white/blacklist logger

SYNOPSIS
       dnsblog [generic	Postfix	daemon options]

DESCRIPTION
       The  dnsblog(8)	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 postscreen(8) server.

PROTOCOL
       With each connection, the dnsblog(8) 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 dnsblog(8) 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  dnsblog(8)
       server closes the connection.

DIAGNOSTICS
       Problems	and transactions are logged to syslogd(8) or postlogd(8).

CONFIGURATION PARAMETERS
       Changes to main.cf are picked up	automatically, as dnsblog(8) 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 postconf(5) for
       more details including examples.

       config_directory	(see 'postconf -d' output)
	      The default location of the Postfix main.cf and  master.cf  con-
	      figuration files.

       daemon_timeout (18000s)
	      How  much	time a Postfix daemon process may take to handle a re-
	      quest before it is terminated by a built-in watchdog timer.

       postscreen_dnsbl_sites (empty)
	      Optional list of DNS white/blacklist domains, filters and	weight
	      factors.

       ipc_timeout (3600s)
	      The  time	limit for sending or receiving information over	an in-
	      ternal communication channel.

       process_id (read-only)
	      The process ID of	a Postfix command or daemon process.

       process_name (read-only)
	      The process name of a Postfix command or daemon process.

       queue_directory (see 'postconf -d' output)
	      The location of the Postfix top-level queue directory.

       syslog_facility (mail)
	      The syslog facility of Postfix logging.

       syslog_name (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:

       service_name (read-only)
	      The master.cf service name of a Postfix daemon process.

SEE ALSO
       smtpd(8), Postfix SMTP server
       postconf(5), configuration parameters
       postlogd(8), Postfix logging
       syslogd(8), system logging

LICENSE
       The Secure Mailer license must be distributed with this software.

HISTORY
       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)

NAME | SYNOPSIS | DESCRIPTION | PROTOCOL | DIAGNOSTICS | CONFIGURATION PARAMETERS | SEE ALSO | LICENSE | HISTORY | AUTHOR(S)

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