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Filename : syslog2eximlog
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#!/usr/bin/perl -w
#
# Copyright (c) 2003 Martin A. Godisch for Debian GNU/Linux, GPL

=head1 NAME

syslog2eximlog - make syslog output suitable for eximstats

=head1 SYNOPSIS

B<syslog2eximlog> B<<> I<mail.log> B<|> B<eximstats>

=head1 DESCRIPTION

syslog2eximlog converts logfiles produced by syslog when using
B<log_file_path = syslog> in your I<exim.conf> back to exim
logfile format, suitable for B<eximstats>. B<syslog_timestamp>
may be B<true> or B<false>.

The program always succeeds, invalid lines will be ignored.

=head1 BUGS

Please report any bugs directly to the author.

=head1 AUTHOR

Martin A. Godisch <godisch@debian.org> for Debian GNU/Linux.

=head1 SEE ALSO

B<eximstats>(8)

=cut

my @date  = localtime(time);
$date[4] +=    1;
$date[5] += 1900;
my %names = (
	"Jan", "01", "Feb", "02", "Mar", "03", "Apr", "04",
	"May", "05", "Jun", "06", "Jul", "07", "Aug", "08",
	"Sep", "09", "Oct", "10", "Nov", "11", "Dec", "12"
);

while (<>) {
	next unless (s/^(\w{3})\s([\s\d]\d)\s(\d\d):(\d\d):(\d\d)\s\S+\sexim\[\d+\]:\s//);

	my ($month, $day, $hour, $min, $sec) = ($names{$1}, $2, $3, $4, $5);

	if (/^\d{4}-\d\d-\d\d\s\d\d:\d\d:\d\d\s/) {
		print $_;
	} else {
		printf "%04d-%02d-%02d %02d:%02d:%02d %s",
			# assume current year if month/day <= today, otherwise assume last year
			$month > $date[4] || $month == $date[4] && $day > $date[3] ? $date[5] - 1 : $date[5],
			$month, $day, $hour, $min, $sec, $_;
	}
}

exit 0;