dnsblog - Postfix DNS white/blacklist logger
dnsblog [generic Postfix daemon options]
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).
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
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".
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
+---------------+------------------------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+------------------------------+
|Availability | service/network/smtp/postfix |
+---------------+------------------------------+
|Stability | Volatile |
+---------------+------------------------------+
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
NOTES
Source code for open source software components in Oracle Solaris can
be found at https://www.oracle.com/downloads/opensource/solaris-source-
code-downloads.html.
This software was built from source available at
https://github.com/oracle/solaris-userland. The original community
source was downloaded from https://archive.mgm51.com/mirrors/postfix-
source/official/postfix-3.2.2.tar.gz.
Further information about this software can be found on the open source
community website at http://www.postfix.org.
DNSBLOG(8)