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#! /usr/bin/perl
# Copyright (c) The Exim Maintainers 2020 - 2023
# Copyright (c) 2007-2017 University of Cambridge.
# See the file NOTICE for conditions of use and distribution.
# SPDX-License-Identifier: GPL-2.0-or-later
use warnings;
use strict;
BEGIN { pop @INC if $INC[-1] eq '.' };
use Pod::Usage;
use Getopt::Long qw(:config no_ignore_case);
use File::Basename;
# Except when they appear in comments, the following placeholders in this
# source are replaced when it is turned into a runnable script:
#
# PERL_COMMAND
# ZCAT_COMMAND
# COMPRESS_SUFFIX
# This file has been so processed.
# This is a perl script which extracts from an Exim log all entries
# for all messages that have an entry that matches a given pattern.
# If *any* entry for a particular message matches the pattern, *all*
# entries for that message are displayed.
# We buffer up information on a per-message basis. It is done this way rather
# than reading the input twice so that the input can be a pipe.
# There must be one argument, which is the pattern. Subsequent arguments
# are the files to scan; if none, the standard input is read. If any file
# appears to be compressed, it is passed through zcat. We can't just do this
# for all files, because zcat chokes on non-compressed files.
# Performance optimized in 02/02/2007 by Jori Hamalainen
# Typical run time acceleration: 4 times
use POSIX qw(mktime);
# This subroutine converts a time/date string from an Exim log line into
# the number of seconds since the epoch. It handles optional timezone
# information.
sub seconds
{
my($year,$month,$day,$hour,$min,$sec,$tzs,$tzh,$tzm) =
$_[0] =~ /^(\d{4})-(\d\d)-(\d\d)\s(\d\d):(\d\d):(\d\d)(?:.\d+)?(?>\s([+-])(\d\d)(\d\d))?/o;
my $seconds = mktime $sec, $min, $hour, $day, $month - 1, $year - 1900;
if (defined $tzs)
{
$seconds -= $tzh * 3600 + $tzm * 60 if $tzs eq "+";
$seconds += $tzh * 3600 + $tzm * 60 if $tzs eq "-";
}
return $seconds;
}
# This subroutine processes a single line (in $_) from a log file. Program
# defensively against short lines finding their way into the log.
my (%saved, %id_list, $pattern);
my $queue_time = -1;
my $insensitive = 1;
my $invert = 0;
my $related = 0;
my $use_pager = 1;
my $literal = 0;
# If using "related" option, have to track extra message IDs
my $related_re='';
my @Mids = ();
sub do_line
{
# Convert syslog lines to mainlog format, as in eximstats.
if (!/^\d{4}-/o) { $_ =~ s/^.*? exim\b.*?: //o; }
return unless
my($date,$id) = /^(\d{4}-\d\d-\d\d \d\d:\d\d:\d\d(?:\.\d+)? (?:[+-]\d{4} )?)(?:\[\d+\] )?(\w{6}\-\w{6}\-\w{2}|\w{6}-\w{11}-\w{4})?/o;
# Handle the case when the log line belongs to a specific message. We save
# lines for specific messages until the message is complete. Then either print
# or discard.
if (defined $id)
{
$saved{$id} = '' unless defined($saved{$id});
# Save up the data for this message in case it becomes interesting later.
$saved{$id} .= $_;
# Are we interested in this id ? Short circuit if we already were interested.
if ($invert)
{
$id_list{$id} = 1 if (!defined($id_list{$id}));
$id_list{$id} = 0 if (($insensitive && /$pattern/io) || /$pattern/o);
}
else
{
if (defined $id_list{$id} ||
($insensitive && /$pattern/io) || /$pattern/o)
{
$id_list{$id} = 1;
get_related_ids($id) if $related;
}
elsif ($related && $related_re)
{
grep_for_related($_, $id);
}
}
# See if this is a completion for some message. If it is interesting,
# print it, but in any event, throw away what was saved.
if (index($_, 'Completed') != -1 ||
index($_, 'SMTP data timeout') != -1 ||
(index($_, 'rejected') != -1 &&
/^(\d{4}-\d\d-\d\d \d\d:\d\d:\d\d(?:\.\d+)? (?:[+-]\d{4} )?)(?:\[\d+\] )?(?:\w{6}\-\w{6}\-\w{2}|\w{6}-\w{11}-\w{4}) rejected/o))
{
if ($queue_time != -1 &&
$saved{$id} =~ /^(\d{4}-\d\d-\d\d \d\d:\d\d:\d\d ([+-]\d{4} )?)/o)
{
my $old_sec = &seconds($1);
my $sec = &seconds($date);
$id_list{$id} = 0 if $id_list{$id} && $sec - $old_sec <= $queue_time;
}
print "$saved{$id}\n" if ($id_list{$id});
delete $id_list{$id};
delete $saved{$id};
}
}
# Handle the case where the log line does not belong to a specific message.
# Print it if it is interesting.
elsif ( ($invert && (($insensitive && !/$pattern/io) || !/$pattern/o)) ||
(!$invert && (($insensitive && /$pattern/io) || /$pattern/o)) )
{ print "$_\n"; }
}
# Rotated log files are frequently compressed and there are a variety of
# formats it could be compressed with. Rather than use just one that is
# detected and hardcoded at Exim compile time, detect and use what the
# logfile is compressed with on the fly.
#
# List of known compression extensions and their associated commands:
my $compressors = {
gz => { cmd => 'zcat', args => '' },
bz2 => { cmd => 'bzcat', args => '' },
xz => { cmd => 'xzcat', args => '' },
lzma => { cmd => 'lzma', args => '-dc' },
zst => { cmd => 'zstdcat', args => '' },
};
my $csearch = 0;
sub detect_compressor_bin
{
my $ext = shift();
my $c = $compressors->{$ext}->{cmd};
$compressors->{$ext}->{bin} = `which $c 2>/dev/null`;
chomp($compressors->{$ext}->{bin});
}
sub detect_compressor_capable
{
my $filename = shift();
map { &detect_compressor_bin($_) } keys %$compressors
if (!$csearch);
$csearch = 1;
return undef
unless (grep {$filename =~ /\.(?:$_)$/} keys %$compressors);
# Loop through them, figure out which one it detected,
# and build the commandline.
my $cmdline = undef;
foreach my $ext (keys %$compressors)
{
if ($filename =~ /\.(?:$ext)$/)
{
# Just die if compressor not found; if this occurs in the middle of
# two valid files with a lot of matches, error could easily be missed.
die("Didn't find $ext decompressor for $filename\n")
if ($compressors->{$ext}->{bin} eq '');
$cmdline = $compressors->{$ext}->{bin} ." ".
$compressors->{$ext}->{args};
last;
}
}
return $cmdline;
}
sub grep_for_related
{
my ($line,$id) = @_;
$id_list{$id} = 1 if $line =~ m/$related_re/;
}
sub get_related_ids
{
my ($id) = @_;
push @Mids, $id unless grep /\b$id\b/, @Mids;
my $re = join '|', @Mids;
$related_re = qr/$re/;
}
# The main program. Extract the pattern and make sure any relevant characters
# are quoted if the -l flag is given. The -t flag gives a time-on-queue value
# which is an additional condition. The -M flag will also display "related"
# loglines (msgid from matched lines is searched in following lines).
GetOptions(
'I|sensitive' => sub { $insensitive = 0 },
'l|literal' => \$literal,
'M|related' => \$related,
't|queue-time=i' => \$queue_time,
'pager!' => \$use_pager,
'v|invert' => \$invert,
'h|help' => sub { pod2usage(-exit => 0, -verbose => 1) },
'm|man' => sub {
pod2usage(
-exit => 0,
-verbose => 2,
-noperldoc => system('perldoc -V 2>/dev/null >&2')
);
},
'version' => sub {
print basename($0) . ": $0\n",
"build: 4.97.1\n",
"perl(runtime): $]\n";
exit 0;
},
) and @ARGV or pod2usage;
$pattern = shift @ARGV;
$pattern = quotemeta $pattern if $literal;
# Start a pager if output goes to a terminal
if (-t 1 and $use_pager)
{
# for perl >= v5.10.x: foreach ($ENV{PAGER}//(), 'less', 'more')
foreach (defined $ENV{PAGER} ? $ENV{PAGER} : (), 'less', 'more')
{
local $ENV{LESS} .= ' --no-init --quit-if-one-screen';
open(my $pager, '|-', $_) or next;
select $pager;
last;
}
}
# If file arguments are given, open each one and process according as it is
# is compressed or not.
if (@ARGV)
{
foreach (@ARGV)
{
my $filename = $_;
if (-x '/usr/bin/zcat' && $filename =~ /\.(?:gz)$/o)
{
open(LOG, "/usr/bin/zcat $filename |") ||
die "Unable to zcat $filename: $!\n";
}
elsif (my $cmdline = &detect_compressor_capable($filename))
{
open(LOG, "$cmdline $filename |") ||
die "Unable to decompress $filename: $!\n";
}
else
{
open(LOG, "<$filename") || die "Unable to open $filename: $!\n";
}
do_line() while (<LOG>);
close(LOG);
}
}
# If no files are named, process STDIN only
else { do_line() while (<STDIN>); }
# At the end of processing all the input, print any uncompleted messages.
for (keys %id_list)
{
print "+++ $_ has not completed +++\n$saved{$_}\n";
}
__END__
=head1 NAME
exigrep - search Exim's main log
=head1 SYNOPSIS
B<exigrep> [options] pattern [log] ...
=head1 DESCRIPTION
The B<exigrep> utility is a Perl script that searches one or more main log
files for entries that match a given pattern. When it finds a match,
it extracts all the log entries for the relevant message, not just
those that match the pattern. Thus, B<exigrep> can extract complete log
entries for a given message, or all mail for a given user, or for a
given host, for example.
If no file names are given on the command line, the standard input is read.
For known file extensions indicating compression (F<.gz>, F<.bz2>, F<.xz>,
F<.lzma>, and F<.zst>) a suitable de-compressor is used, if available.
The output is sent through a pager if a terminal is connected to STDOUT. As
pager are considered: C<$ENV{PAGER}>, C<less>, C<more>.
=head1 OPTIONS
=over
=item B<-l>|B<--literal>
This means 'literal', that is, treat all characters in the
pattern as standing for themselves. Otherwise the pattern must be a
Perl regular expression. The pattern match is case-insensitive.
=item B<-t>|B<--queue-time> I<seconds>
Limit the output to messages that spent at least I<seconds> in the
queue.
=item B<-I>|B<--sensitive>
Do a case sensitive search.
=item B<-v>|B<--invert>
Invert the meaning of the search pattern. That is, print message log
entries that are not related to that pattern.
=item B<-M>|B<--related>
Search for related messages too.
=item B<--no-pager>
Do not use a pager, even if STDOUT is connected to a terminal.
=item B<-h>|B<--help>
Print a short reference help. For more detailed help try L<exigrep(8)>,
or C<exigrep --man>.
=item B<-m>|B<--man>
Print this manual page of B<exigrep>.
=back
=head1 SEE ALSO
L<exim(8)>, L<perlre(1)>, L<Exim|http://exim.org/>
=head1 AUTHOR
This manual page was stitched together from spec.txt by Andreas Metzler L<ametzler at downhill.at.eu.org>
and updated by Heiko Schlittermann L<hs@schlittermann.de>.
=cut