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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 OSF1

mailstats

mailstats(8)						      System Manager's Manual						      mailstats(8)

NAME

       mailstats - Displays statistics about mail traffic

SYNOPSIS

       mailstats [-o] [-C cffile [-f stfile]

FLAGS

       Do  not	display the name of the mailer in the output.  Use cffile as the name of the sendmail "cf" file instead of /var/adm/sendmail/send-
       mail.cf.  Use stfile as the input statistics file instead of /var/adm/sendmail/sendmail.st.

DESCRIPTION

       The mailstats command reads the information in the /var/adm/sendmail/sendmail.st file (or in the file specified with the -f flag),  formats
       it,  and  writes  it to standard output.  Note also that you can change the location of the sendmail.st file by editing its pathname in the
       sendmail.cf file.

EXAMPLES

       The format of the information is shown in the following example, in which the first field (M) contains a number that indicates the position
       of  that  mailer  in  the sendmail.cf file, starting at 0 (zero).  For example, the first mailer in the sendmail.cf file corresponds to the
       number 0 in the mailstats display, the second mailer corresponds to the number 1, and so on.  Statistics from Thu Feb 17  11:20:01  2000  M
       msgsfr	bytes_from    msgsto	 bytes_to   msgsrej msgsdis  Mailer 1	    50	       77K	  1	     3K        0       0   local 6
       43	  59K	    58		99K	    0	     0	   smtp  ============================================================  T	93
       136K	   59	      102K	   0	   0 The fields in the report have the following meanings: Indicates the position of the mailer in
       the sendmail.cf file.  Indicates the number of messages received by the local machine from the indicated mailer.  Indicates the	number	of
       bytes  in  the  messages  received  by  the  local machine from the indicated mailer.  Indicates the number of messages sent from the local
       machine using the indicated mailer.  Indicates the number of bytes in the messages sent from the local machine using the indicated  mailer.
       Indicates the number of rejected messages.  Indicates the number of discarded messages.	Indicates the name of the mailer.

       If sendmail transmits mail directly to a file, such as the dead.letter file or an alias target, the message and byte counts are credited to
       the prog mailer, as defined in the sendmail.cf file.  However, mailstats will still default to var/adm/sendmail/sendmail.st.

FILES

       Specifies the command path Contains system statistics Contains configuration information for sendmail

RELATED INFORMATION

       Commands: sendmail(8) delim off

																      mailstats(8)
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