DNSBLOG
Section: Maintenance Commands (8)
Page Index
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; 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
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)
-
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