NAME

Mail::Exim::MainLogParser - Parse log lines from the Exim Main Log

SYNOPSIS

use Mail::Exim::MainLogParser;
use Data::Dumper;
my $exlog = new Mail::Exim::MainLogParser;

my $logline = "2017-06-08 11:17:56 1dJ08B-0003oP-5i <= do-not-reply@nowhere.com H=realmail.server.example.com (ehlo-name.example.com) [192.168.250.101] P=esmtp S=1364 id=266785270.3.2385849643852@peerhost.server.example.com";
$logLineHashStructure = $exlog->parse($logline);

print Dumper($logLineHashStructure);
$VAR1 = {
        'eximid' => '1dJ08B-0003oP-5i',
        'time' => '11:17:56',
        'date' => '2017-06-08',
        'args' => [
                    {
                      'H' => 'realmail.server.example.com (ehlo-name.example.com) [192.168.250.101]'
                    },
                    {
                      'P' => 'esmtp'
                    },
                    {
                      'S' => '1364'
                    },
                    {
                      'id' => '266785270.3.2385849643852@peerhost.server.example.com'
                    }
                  ],
        'address' => 'do-not-reply@nowhere.com',
        'flag' => '<='
      };

DESCRIPTION

This module will parse log lines from Exim version 4, according to the source http://www.exim.org/exim-html-current/doc/html/spec_html/ch-log_files.html as of 2017-06-08

REQUIREMENTS

This module is pure perl and does not depend on other modules. But does depend on a log file from Exim version 4 main log output.

• Exim 4

IMPORTED METHODS

When the calling application invokes this module in a use clause, the following method can be imported into its space.

• EximMainLoglineParse
• EximMainLoglineCompose

METHODS

new

Create a new object instances of this module. It is not necessary to create an object for this module, as the methods can be called outside of OO style programming.

• returns

  An object instance of this module.

  my $eximlog = new Mail::Exim::MainLogParser();

EximMainLoglineParse

See parse().

parse

Parse a line from the Exim main log file and return a hash structure.

$exim_log_line_hash = $exlog->parse($exim_log_line_string);

• exim_log_line_string

  This is a single line from the Exim main log output. The below example log line is split over several lines in order to fit it on the page.

    2017-06-08 11:17:56 1dJ08B-0003oP-5i <= do-not-reply@nowhere.com
        H=realmail.server.example.com (ehlo-name.example.com) [192.168.250.101]
        P=esmtp S=1364 id=266785270.3.2385849643852@peerhost.server.example.com
  

This method returns a hash structure of the parsed log line.

print Dumper($exim_log_line_hash);
$VAR1 = {
      'eximid' => '1dJ08B-0003oP-5i',
      'time' => '11:17:56',
      'date' => '2017-06-08',
      'args' => [
                  {
                    'H' => 'realmail.server.example.com (ehlo-name.example.com) [192.168.250.101]'
                  },
                  {
                    'P' => 'esmtp'
                  },
                  {
                    'S' => '1364'
                  },
                  {
                    'id' => '266785270.3.2385849643852@peerhost.server.example.com'
                  }
                ],
      'address' => 'do-not-reply@nowhere.com',
      'flag' => '<='
    };

EximMainLoglineCompose

See compose().

compose

Compose a log line from a parsed main log line hash and return as a string.

$exim_log_line_composed = $exlog->compose($exim_log_line_hash)

• exim_log_line_hash

  This is a single parsed line from the Exim main log output represented as a HASH.

    $exim_parsed_main_log_line = {
          'eximid' => '1dJ08B-0003oP-5i',
          'time' => '11:17:56',
          'date' => '2017-06-08',
          'args' => [
                      {
                        'H' => 'realmail.server.example.com (ehlo-name.example.com) [192.168.250.101]'
                      },
                      {
                        'P' => 'esmtp'
                      },
                      {
                        'S' => '1364'
                      },
                      {
                        'id' => '266785270.3.2385849643852@peerhost.server.example.com'
                      }
                    ],
          'address' => 'do-not-reply@nowhere.com',
          'flag' => '<='
        };
  

This method returns a string composition of the parsed log line HASH structure. It is intended that the composed string matches the original log line that was parsed, minus trailing white space.

print "$LoglineComposed";
2017-06-08 11:17:56 1dJ08B-0003oP-5i <= do-not-reply@nowhere.com
    H=realmail.server.example.com (ehlo-name.example.com) [192.168.250.101]
    P=esmtp S=1364 id=266785270.3.2385849643852@peerhost.server.example.com

EXAMPLES

Show exim mail transactions for a particular email address

use Mail::Exim::MainLogParser;
$exilog = new Mail::Exim::MainLogParser();
my $emailaddress='me@example.com';
my $index = {};
my @mine_queued = ();
my $line_count = 0;
# open(EXIMLOG,"tail -f /var/log/exim/main.log |");  # Use `tail -f` to watch logs in real time
open(EXIMLOG,"cat /var/log/exim/main.log |");
while (my $line = <EXIMLOG>) {
    $line_count++;
    chomp($line);
    my $parsed = $exilog->parse($line) || (warn "Warn: Could not parse line $line_count.\n" && next);
    # Add each transaction to an eximid index
    if (exists $parsed->{'eximid'}) {
        push(@{$index->{$parsed->{'eximid'}}}, $parsed);
    }
    # Track the exim transactions that send or deliver via my email address
    if ((exists $parsed->{'address'}) && ($parsed->{'address'} =~ /$emailaddress/i)) {
        push(@mine_queued,$parsed->{'eximid'});
    }
    # Once a queued message is completed, print out transactions if mine, delete it
    if ((exists $parsed->{'message'}) && ($parsed->{'message'} =~ /Completed/i)) {
        my $eximid = $parsed->{'eximid'};
        if (grep /$eximid/, @mine_queued) {
            foreach my $eximtransaction (@{$index->{$eximid}}) {
                print $exilog->compose($eximtransaction),"\n";
            }
            @mine_queued = grep ! /$eximid/, @mine_queued;
        }
        delete $index->{$eximid};
    }
}
if (scalar @mine_queued >= 1) {
    # Once we reach the end of the log, there may still be messages that have not completed yet
    print "#"x10," My Uncompleted Messages ","#"x10,"\n";
    foreach my $eximid (@mine_queued) {
        foreach my $eximtransaction (@{$index->{$eximid}}) {
            print $exilog->compose($eximtransaction),"\n";
        }
    }
}
close(EXIMLOG);

Output

2020-05-25 10:25:34 1jdEyr-0003IG-QE <= somelist-users-bounces@example10.com H=lists.example10.com [10.10.12.136] P=esmtp S=2761 id=159999925705.99.3666999992664571474@mailman-web
2020-05-25 10:25:34 1jdEyr-0003IG-QE => me@example.com R=relay_user_to_gate1 T=remote_smtp H=smtp.example.com [10.100.200.27] X=TLSv1:AES128-SHA:128
2020-05-25 10:25:34 1jdEyr-0003IG-QE Completed
2020-05-25 11:19:42 1jdFpE-0003Xt-1L <= mailalias@example20.com H=mail.example20.com [10.20.12.168] P=esmtps X=TLSv1:AES256-SHA:256 S=50040 id=49fd3f1f7cab999999951cba1aab8cdc@example20.com
2020-05-25 11:19:43 1jdFpE-0003Xt-1L => me@example.com R=relay_user_to_gate1 T=remote_smtp H=smtp.example.com [10.100.200.27] X=TLSv1:AES128-SHA:128
2020-05-25 11:19:43 1jdFpE-0003Xt-1L Completed

AUTHOR

Russell Glaue, http://russ.glaue.org

SEE ALSO

Exim4 log documentation: http://www.exim.org/exim-html-current/doc/html/spec_html/ch-log_files.html

COPYRIGHT

Copyright (c) 2017-2020 Russell E Glaue, Center for the Application of Information Technologies, Western Illinois University All rights reserved.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

The full text of the license can be found in the LICENSE file included with this module.