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Full Discussion: Sendmail K command regex: adding exclusion/negative lookahead to regex -a@MATCH
Top Forums Shell Programming and Scripting Sendmail K command regex: adding exclusion/negative lookahead to regex -a@MATCH Post 302994229 by RobbieTheK on Monday 20th of March 2017 03:00:38 PM
Old 03-20-2017
Linux Sendmail K command regex: adding exclusion/negative lookahead to regex -a@MATCH
I'm trying to get some exclusions into our sendmail regular expression for the K command. The following configuration & regex works:
Code:
LOCAL_CONFIG
#
Kcheckaddress regex -a@MATCH
    [a-zA-Z_0-9.-]+<@[a-zA-Z_0-9-]+?\.+[a-zA-Z_0-9.-]+?\.(us|info|to|br|bid|cn|ru)
LOCAL_RULESETS
SLocal_check_mail
# check address against various regex checks
R$*                             $: $>Parse0 $>3 $1
R$+                             $: $(checkaddress $1 $)
R@MATCH                         $#error $: "553 Your Domain is Blocked for Unsolicited Mail"

So we are blocking anything@subdomain.domain.us but not anything@domain.us. I'd like to add exclusions for cities and schools so to allow user@ci.somedomain.us and user@subdomain.[state].us. (note that [state] means 1 of the 50 states including DC).

This regex with negative lookahead syntax is not working (using CA for California as a test):
Code:
(?!.*\@ci\..+?\.us$)(?!.*\@*\..+?\.ca.us$)([a-zA-Z_0-9.-]+@[a-zA-Z_0-9-]+?\.+[a-zA-Z_0-9.-]+?\.(us)$)

I get this error:
Code:
sendmail -bt
/etc/mail/sendmail.cf: line 199: pattern-compile-error: Invalid preceding regular expression

I'm pretty sure that sendmail's R & K commands do not support negative look-aheads. So if anyone can help re-write the regex in a sed-friendly format I'd be grateful! Here is a link to K command switches. Any suggestions on how to get the negative lookahead to work in sendmail?
 

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LEARN ABOUT DEBIAN

sensible-mda

SENSIBLE-MDA(8) 					      System Manager's Manual						   SENSIBLE-MDA(8)

NAME

       sensible-mda - a generic local MDA router for Debian systems

SYNOPSIS

       sensible-mda from to detail client-addr

DESCRIPTION

       sensible-mda  is used to simplify the installation and configuration of sendmail(8) , or other MTAs for use on Debian systems.  With sensi-
       ble-mda, sendmail can support a plethora of MDAs (procmail, maildrop, deliver, etc.) without having  pick any one of them as required.

FUNCTION

       sensible-mda is called by sendmail as a local mailer when the following exists in sendmail.mc:
       define(`LOCAL_MAILER_ARGS', `sensible-mda $g $u $h ${client_addr}')dnl

       sensible-mda will look for the following MDAs (in this order), and pass the mail on to the first SUID MDA found (Or first found MDA, if run
       w/euid=root): procmail(1), maildrop(1), deliver(8), mail.local(8)

OPTIONS

       Available command line options are the following:

       from   The sender of this email (sendmail $g variable)

       to     The recipient of this email (sendmail $u variable)

       detail The detail portion of the recipient userid (sendmail $h variable) - ie:
	      cowboy+sendmail@debian.org

       client-addr
	      TCP/IP address of the sender (sendmail ${client_addr} variable) Not used (for the nonce)

FILES

       /etc/mail/sendmail.mc
	      sendmail m4 input to generate sendmail.cf

       /etc/mail/sendmail.cf
	      actual sendmail configuration file (treated as a binary file)

SEE ALSO

       sendmail(8), procmail(1), maildrop(1), deliver(8), mail.local(8)

BUGS

       None known so far.

AUTHOR

       Richard Nelson <cowboy@debian.org>

HISTORY

4th Berkeley Distribution					  October 21 1999						   SENSIBLE-MDA(8)
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