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Diffstat (limited to 'man/man5/regexp_table.5')
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diff --git a/man/man5/regexp_table.5 b/man/man5/regexp_table.5 new file mode 100644 index 0000000..7e60a26 --- /dev/null +++ b/man/man5/regexp_table.5 @@ -0,0 +1,203 @@ +.TH REGEXP_TABLE 5 +.ad +.fi +.SH NAME +regexp_table +\- +format of Postfix regular expression tables +.SH "SYNOPSIS" +.na +.nf +\fBpostmap \-q "\fIstring\fB" regexp:/etc/postfix/\fIfilename\fR + +\fBpostmap \-q \- regexp:/etc/postfix/\fIfilename\fB <\fIinputfile\fR +.SH DESCRIPTION +.ad +.fi +The Postfix mail system uses optional tables for address +rewriting, mail routing, or access control. These tables +are usually in \fBdbm\fR or \fBdb\fR format. + +Alternatively, lookup tables can be specified in POSIX regular +expression 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. Use "\fBpostmap \-hmq +\-\fR <\fIfile\fR" for header_checks(5) patterns, and +"\fBpostmap \-bmq \-\fR <\fIfile\fR" for body_checks(5) +(Postfix 2.6 and later). +.SH "COMPATIBILITY" +.na +.nf +.ad +.fi +With Postfix version 2.2 and earlier specify "\fBpostmap +\-fq\fR" to query a table that contains case sensitive +patterns. Patterns are case insensitive by default. +.SH "TABLE FORMAT" +.na +.nf +.ad +.fi +The general form of a Postfix regular expression table is: +.IP "\fB/\fIpattern\fB/\fIflags result\fR" +When \fIpattern\fR matches the input string, +use the corresponding \fIresult\fR value. +.IP "\fB!/\fIpattern\fB/\fIflags result\fR" +When \fIpattern\fR does \fBnot\fR match the input string, +use the corresponding \fIresult\fR value. +.IP "\fBif /\fIpattern\fB/\fIflags\fR" +.IP "\fBendif\fR" +If the input string matches /\fIpattern\fR/, then match that +input string against the patterns between \fBif\fR and +\fBendif\fR. The \fBif\fR..\fBendif\fR can nest. +.sp +Note: do not prepend whitespace to patterns inside +\fBif\fR..\fBendif\fR. +.sp +This feature is available in Postfix 2.1 and later. +.IP "\fBif !/\fIpattern\fB/\fIflags\fR" +.IP "\fBendif\fR" +If the input string does not match /\fIpattern\fR/, then +match that input string against the patterns between \fBif\fR +and \fBendif\fR. The \fBif\fR..\fBendif\fR can nest. +.sp +Note: do not prepend whitespace to patterns inside +\fBif\fR..\fBendif\fR. +.sp +This feature is available in Postfix 2.1 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. +.PP +Each pattern is a POSIX regular expression enclosed by a pair of +delimiters. The regular expression syntax is documented in +\fBre_format\fR(7) with 4.4BSD, in \fBregex\fR(5) with Solaris, and in +\fBregex\fR(7) with Linux. Other systems may use other document names. + +The expression delimiter can be any non\-alphanumerical +character, except whitespace +or characters that have special meaning (traditionally the forward +slash is used). The regular expression can contain whitespace. + +By default, matching is case\-insensitive, and newlines are not +treated as special characters. The behavior is controlled by flags, +which are toggled by appending one or more of the following +characters after the pattern: +.IP "\fBi\fR (default: on)" +Toggles the case sensitivity flag. By default, matching is case +insensitive. +.IP "\fBm\fR (default: off)" +Toggle the multi\-line mode flag. When this flag is on, the \fB^\fR +and \fB$\fR metacharacters match immediately after and immediately +before a newline character, respectively, in addition to +matching at the start and end of the input string. +.IP "\fBx\fR (default: on)" +Toggles the extended expression syntax flag. By default, support +for extended expression syntax is enabled. +.SH "TABLE SEARCH ORDER" +.na +.nf +.ad +.fi +Patterns are applied in the order as specified in the table, until a +pattern is found that matches the input string. + +Each pattern is applied to the entire input string. +Depending on the application, that string is an entire client +hostname, an entire client IP address, or an entire mail address. +Thus, no parent domain or parent network search is done, and +\fIuser@domain\fR mail addresses are not broken up into their +\fIuser\fR and \fIdomain\fR constituent parts, nor is \fIuser+foo\fR +broken up into \fIuser\fR and \fIfoo\fR. +.SH "TEXT SUBSTITUTION" +.na +.nf +.ad +.fi +Substitution of substrings (text that matches patterns +inside "()") from the matched expression into the result +string is requested with $1, $2, etc.; specify $$ to produce +a $ character as output. +The macros in the result string may need to be written as +${n} or $(n) if they aren't followed by whitespace. + +Note: since negated patterns (those preceded by \fB!\fR) return a +result when the expression does not match, substitutions are not +available for negated patterns. +.SH "EXAMPLE SMTPD ACCESS MAP" +.na +.nf +# Disallow sender\-specified routing. This is a must if you relay mail +# for other domains. +/[%!@].*[%!@]/ 550 Sender\-specified routing rejected + +# Postmaster is OK, that way they can talk to us about how to fix +# their problem. +/^postmaster@/ OK + +# Protect your outgoing majordomo exploders +if !/^owner\-/ +/^(.*)\-outgoing@(.*)$/ 550 Use ${1}@${2} instead +endif +.SH "EXAMPLE HEADER FILTER MAP" +.na +.nf +# These were once common in junk mail. +/^Subject: make money fast/ REJECT +/^To: friend@public\\.com/ REJECT +.SH "EXAMPLE BODY FILTER MAP" +.na +.nf +# First skip over base 64 encoded text to save CPU cycles. +~^[[:alnum:]+/]{60,}$~ OK + +# Put your own body patterns here. +.SH "SEE ALSO" +.na +.nf +postmap(1), Postfix lookup table manager +pcre_table(5), format of PCRE tables +cidr_table(5), format of CIDR tables +.SH "README FILES" +.na +.nf +.ad +.fi +Use "\fBpostconf readme_directory\fR" or +"\fBpostconf html_directory\fR" to locate this information. +.na +.nf +DATABASE_README, Postfix lookup table overview +.SH "AUTHOR(S)" +.na +.nf +The regexp table lookup code was originally written by: +LaMont Jones +lamont@hp.com + +That code was based on the PCRE dictionary contributed by: +Andrew McNamara +andrewm@connect.com.au +connect.com.au Pty. Ltd. +Level 3, 213 Miller St +North Sydney, NSW, Australia + +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 |