1DNSBLOG(8)                  System Manager's Manual                 DNSBLOG(8)
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NAME

6       dnsblog - Postfix DNS white/blacklist logger
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SYNOPSIS

9       dnsblog [generic Postfix daemon options]
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DESCRIPTION

12       The  dnsblog(8)  server implements an ad-hoc DNS white/blacklist lookup
13       service. This may eventually be replaced by an UDP client that is built
14       directly into the postscreen(8) server.
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PROTOCOL

17       With each connection, the dnsblog(8) server receives a DNS white/black‐
18       list domain name, an IP address, and an  ID.   If  the  IP  address  is
19       listed  under  the  DNS white/blacklist, the dnsblog(8) server logs the
20       match and replies with the query arguments plus an  address  list  with
21       the resulting IP addresses, separated by whitespace, and the reply TTL.
22       Otherwise it replies with the query arguments  plus  an  empty  address
23       list  and the reply TTL; the reply TTL is -1 if there is no reply, or a
24       negative reply that contains no SOA record.   Finally,  the  dnsblog(8)
25       server closes the connection.
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DIAGNOSTICS

28       Problems and transactions are logged to syslogd(8).
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CONFIGURATION PARAMETERS

31       Changes to main.cf are picked up automatically, as dnsblog(8) processes
32       run for only a limited amount of time. Use the command "postfix reload"
33       to speed up a change.
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35       The  text  below provides only a parameter summary. See postconf(5) for
36       more details including examples.
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38       config_directory (see 'postconf -d' output)
39              The default location of the Postfix main.cf and  master.cf  con‐
40              figuration files.
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42       daemon_timeout (18000s)
43              How  much  time  a  Postfix  daemon process may take to handle a
44              request before it is terminated by a built-in watchdog timer.
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46       postscreen_dnsbl_sites (empty)
47              Optional list of DNS white/blacklist domains, filters and weight
48              factors.
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50       ipc_timeout (3600s)
51              The  time  limit  for  sending  or receiving information over an
52              internal communication channel.
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54       process_id (read-only)
55              The process ID of a Postfix command or daemon process.
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57       process_name (read-only)
58              The process name of a Postfix command or daemon process.
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60       queue_directory (see 'postconf -d' output)
61              The location of the Postfix top-level queue directory.
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63       syslog_facility (mail)
64              The syslog facility of Postfix logging.
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66       syslog_name (see 'postconf -d' output)
67              A prefix that  is  prepended  to  the  process  name  in  syslog
68              records, so that, for example, "smtpd" becomes "prefix/smtpd".
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70       Available in Postfix 3.3 and later:
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72       service_name (read-only)
73              The master.cf service name of a Postfix daemon process.
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SEE ALSO

76       smtpd(8), Postfix SMTP server
77       postconf(5), configuration parameters
78       syslogd(5), system logging
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LICENSE

81       The Secure Mailer license must be distributed with this software.
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HISTORY

84       This service was introduced with Postfix version 2.8.
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AUTHOR(S)

87       Wietse Venema
88       IBM T.J. Watson Research
89       P.O. Box 704
90       Yorktown Heights, NY 10598, USA
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92       Wietse Venema
93       Google, Inc.
94       111 8th Avenue
95       New York, NY 10011, USA
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