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#++
# NAME
# cidr_table 5
# SUMMARY
# format of Postfix CIDR tables
# SYNOPSIS
# \fBpostmap -q "\fIstring\fB" cidr:/etc/postfix/\fIfilename\fR
#
# \fBpostmap -q - cidr:/etc/postfix/\fIfilename\fB <\fIinputfile\fR
# DESCRIPTION
# The Postfix mail system uses optional lookup tables.
# These tables are usually in \fBdbm\fR or \fBdb\fR format.
# Alternatively, lookup tables can be specified in CIDR
# (Classless Inter-Domain Routing) form. In this case, each
# input is compared against a list of patterns. When a match
# is found, the corresponding result is returned and the search
# is terminated.
#
# To find out what types of lookup tables your Postfix system
# supports use the "\fBpostconf -m\fR" command.
#
# To test lookup tables, use the "\fBpostmap -q\fR" command as
# described in the SYNOPSIS above.
# TABLE FORMAT
# .ad
# .fi
# The general form of a Postfix CIDR table is:
# .IP "\fIpattern result\fR"
# When a search string matches the specified \fIpattern\fR, use
# the corresponding \fIresult\fR value. The \fIpattern\fR must be
# in \fInetwork/prefix\fR or \fInetwork_address\fR form (see
# ADDRESS PATTERN SYNTAX below).
# .IP "\fB!\fIpattern result\fR"
# When a search string does not match the specified \fIpattern\fR,
# use the specified \fIresult\fR value. The \fIpattern\fR must
# be in \fInetwork/prefix\fR or \fInetwork_address\fR form (see
# ADDRESS PATTERN SYNTAX below).
# .sp
# This feature is available in Postfix 3.2 and later.
# .IP "\fBif \fIpattern\fR"
# .IP "\fBendif\fR"
# When a search string matches the specified \fIpattern\fR, match
# that search string against the patterns between \fBif\fR and
# \fBendif\fR. The \fIpattern\fR must be in \fInetwork/prefix\fR or
# \fInetwork_address\fR form (see ADDRESS PATTERN SYNTAX below). The
# \fBif\fR..\fBendif\fR can nest.
# .sp
# Note: do not prepend whitespace to text between
# \fBif\fR..\fBendif\fR.
# .sp
# This feature is available in Postfix 3.2 and later.
# .IP "\fBif !\fIpattern\fR"
# .IP "\fBendif\fR"
# When a search string does not match the specified \fIpattern\fR,
# match that search string against the patterns between \fBif\fR and
# \fBendif\fR. The \fIpattern\fR must be in \fInetwork/prefix\fR or
# \fInetwork_address\fR form (see ADDRESS PATTERN SYNTAX below). The
# \fBif\fR..\fBendif\fR can nest.
# .sp
# Note: do not prepend whitespace to text between
# \fBif\fR..\fBendif\fR.
# .sp
# This feature is available in Postfix 3.2 and later.
# .IP "blank lines and comments"
# Empty lines and whitespace-only lines are ignored, as
# are lines whose first non-whitespace character is a `#'.
# .IP "multi-line text"
# A logical line starts with non-whitespace text. A line that
# starts with whitespace continues a logical line.
# TABLE SEARCH ORDER
# .ad
# .fi
# Patterns are applied in the order as specified in the table, until a
# pattern is found that matches the search string.
# ADDRESS PATTERN SYNTAX
# .ad
# .fi
# Postfix CIDR tables are pattern-based. A pattern is either
# a \fInetwork_address\fR which requires an exact match, or a
# \fInetwork_address/prefix_length\fR where the \fIprefix_length\fR
# part specifies the length of the \fInetwork_address\fR prefix
# that must be matched (the other bits in the \fInetwork_address\fR
# part must be zero).
#
# An IPv4 network address is a sequence of four decimal octets
# separated by ".", and an IPv6 network address is a sequence
# of three to eight hexadecimal octet pairs separated by ":"
# or "::", where the latter is short-hand for a sequence of
# one or more all-zero octet pairs. The pattern 0.0.0.0/0
# matches every IPv4 address, and ::/0 matches every IPv6
# address. IPv6 support is available in Postfix 2.2 and
# later.
#
# Before comparisons are made, lookup keys and table entries
# are converted from string to binary. Therefore, IPv6 patterns
# will be matched regardless of leading zeros (a leading zero in
# an IPv4 address octet indicates octal notation).
#
# Note: address information may be enclosed inside "[]" but
# this form is not required.
# INLINE SPECIFICATION
# .ad
# .fi
# The contents of a table may be specified in the table name
# (Postfix 3.7 and later).
# The basic syntax is:
#
# .nf
# main.cf:
# \fIparameter\fR \fB= .. cidr:{ { \fIrule-1\fB }, { \fIrule-2\fB } .. } ..\fR
#
# master.cf:
# \fB.. -o { \fIparameter\fR \fB= .. cidr:{ { \fIrule-1\fB }, { \fIrule-2\fB } .. } .. } ..\fR
# .fi
#
# Postfix recursively expands any \fI$parametername\fR instances
# in the above parameter value, ignores whitespace after '{'
# and before '}', and writes each \fIrule\fR as one text line to
# an in-memory file:
#
# .nf
# in-memory file:
# rule-1
# rule-2
# ..
# .fi
#
# Postfix parses the result as if it is a file in /etc/postfix.
#
# Note: if a rule contains \fB$\fR, specify \fB$$\fR to keep
# Postfix from trying to do \fI$name\fR expansion as it
# evaluates a parameter value.
# EXAMPLE SMTPD ACCESS MAP
# .nf
# /etc/postfix/main.cf:
# smtpd_client_restrictions = ... cidr:/etc/postfix/client.cidr ...
#
# /etc/postfix/client.cidr:
# # Rule order matters. Put more specific allowlist entries
# # before more general denylist entries.
# 192.168.1.1 OK
# 192.168.0.0/16 REJECT
# 2001:db8::1 OK
# 2001:db8::/32 REJECT
# .fi
# SEE ALSO
# postmap(1), Postfix lookup table manager
# regexp_table(5), format of regular expression tables
# pcre_table(5), format of PCRE tables
# README FILES
# .ad
# .fi
# Use "\fBpostconf readme_directory\fR" or
# "\fBpostconf html_directory\fR" to locate this information.
# .na
# .nf
# DATABASE_README, Postfix lookup table overview
# HISTORY
# CIDR table support was introduced with Postfix version 2.1.
# AUTHOR(S)
# The CIDR table lookup code was originally written by:
# Jozsef Kadlecsik
# KFKI Research Institute for Particle and Nuclear Physics
# POB. 49
# 1525 Budapest, Hungary
#
# Adopted and adapted by:
# 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
#--
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