1<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN" 2 "http://www.w3.org/TR/html4/loose.dtd"> 3<html> <head> 4<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 5<title> Postfix manual - dnsblog(8) </title> 6</head> <body> <pre> 7DNSBLOG(8) DNSBLOG(8) 8 9<b>NAME</b> 10 dnsblog - Postfix DNS allow/denylist logger 11 12<b>SYNOPSIS</b> 13 <b>dnsblog</b> [generic Postfix daemon options] 14 15<b>DESCRIPTION</b> 16 The <a href="dnsblog.8.html"><b>dnsblog</b>(8)</a> server implements an ad-hoc DNS allow/denylist lookup 17 service. This may eventually be replaced by an UDP client that is built 18 directly into the <a href="postscreen.8.html"><b>postscreen</b>(8)</a> server. 19 20<b>PROTOCOL</b> 21 With each connection, the <a href="dnsblog.8.html"><b>dnsblog</b>(8)</a> server receives a DNS 22 allow/denylist domain name, an IP address, and an ID. If the IP 23 address is listed under the DNS allow/denylist, the <a href="dnsblog.8.html"><b>dnsblog</b>(8)</a> server 24 logs the match and replies with the query arguments plus an address 25 list with the resulting IP addresses, separated by whitespace, and the 26 reply TTL. Otherwise it replies with the query arguments plus an empty 27 address list and the reply TTL; the reply TTL is -1 if there is no 28 reply, or a negative reply that contains no SOA record. Finally, the 29 <a href="dnsblog.8.html"><b>dnsblog</b>(8)</a> server closes the connection. 30 31<b>DIAGNOSTICS</b> 32 Problems and transactions are logged to <b>syslogd</b>(8) or <a href="postlogd.8.html"><b>postlogd</b>(8)</a>. 33 34<b>CONFIGURATION PARAMETERS</b> 35 Changes to <a href="postconf.5.html"><b>main.cf</b></a> are picked up automatically, as <a href="dnsblog.8.html"><b>dnsblog</b>(8)</a> processes 36 run for only a limited amount of time. Use the command "<b>postfix reload</b>" 37 to speed up a change. 38 39 The text below provides only a parameter summary. See <a href="postconf.5.html"><b>postconf</b>(5)</a> for 40 more details including examples. 41 42 <b><a href="postconf.5.html#config_directory">config_directory</a> (see 'postconf -d' output)</b> 43 The default location of the Postfix <a href="postconf.5.html">main.cf</a> and <a href="master.5.html">master.cf</a> con- 44 figuration files. 45 46 <b><a href="postconf.5.html#daemon_timeout">daemon_timeout</a> (18000s)</b> 47 How much time a Postfix daemon process may take to handle a 48 request before it is terminated by a built-in watchdog timer. 49 50 <b><a href="postconf.5.html#postscreen_dnsbl_sites">postscreen_dnsbl_sites</a> (empty)</b> 51 Optional list of DNS allow/denylist domains, filters and weight 52 factors. 53 54 <b><a href="postconf.5.html#ipc_timeout">ipc_timeout</a> (3600s)</b> 55 The time limit for sending or receiving information over an 56 internal communication channel. 57 58 <b><a href="postconf.5.html#process_id">process_id</a> (read-only)</b> 59 The process ID of a Postfix command or daemon process. 60 61 <b><a href="postconf.5.html#process_name">process_name</a> (read-only)</b> 62 The process name of a Postfix command or daemon process. 63 64 <b><a href="postconf.5.html#queue_directory">queue_directory</a> (see 'postconf -d' output)</b> 65 The location of the Postfix top-level queue directory. 66 67 <b><a href="postconf.5.html#syslog_facility">syslog_facility</a> (mail)</b> 68 The syslog facility of Postfix logging. 69 70 <b><a href="postconf.5.html#syslog_name">syslog_name</a> (see 'postconf -d' output)</b> 71 A prefix that is prepended to the process name in syslog 72 records, so that, for example, "smtpd" becomes "prefix/smtpd". 73 74 Available in Postfix 3.3 and later: 75 76 <b><a href="postconf.5.html#service_name">service_name</a> (read-only)</b> 77 The <a href="master.5.html">master.cf</a> service name of a Postfix daemon process. 78 79<b>SEE ALSO</b> 80 <a href="smtpd.8.html">smtpd(8)</a>, Postfix SMTP server 81 <a href="postconf.5.html">postconf(5)</a>, configuration parameters 82 <a href="postlogd.8.html">postlogd(8)</a>, Postfix logging 83 syslogd(8), system logging 84 85<b>LICENSE</b> 86 The Secure Mailer license must be distributed with this software. 87 88<b>HISTORY</b> 89 This service was introduced with Postfix version 2.8. 90 91<b>AUTHOR(S)</b> 92 Wietse Venema 93 IBM T.J. Watson Research 94 P.O. Box 704 95 Yorktown Heights, NY 10598, USA 96 97 Wietse Venema 98 Google, Inc. 99 111 8th Avenue 100 New York, NY 10011, USA 101 102 DNSBLOG(8) 103</pre> </body> </html> 104