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/blacklist 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 (-1 if unavailable). Finally, The
dnsblog(8) server closes the
connection.
DIAGNOSTICS
Problems and transactions are logged to
syslogd(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
configuration files.
- daemon_timeout (18000s)
- How much time a Postfix daemon process may take to handle a
request 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
internal 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)
- The mail system name that is prepended to the process name
in syslog records, so that "smtpd" becomes, for example,
"postfix/smtpd".
SEE ALSO
smtpd(8), Postfix SMTP server
postconf(5), configuration parameters
syslogd(5), 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