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Current File : //lib64/../usr/sbin/exigrep
#! /usr/bin/perl -w

use strict;

# Copyright (c) 2007-2014 University of Cambridge.
# See the file NOTICE for conditions of use and distribution.

# 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 Getopt::Std qw(getopts);
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)(?>\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, $queue_time, $insensitive, $invert);

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{4} )?)(?:\[\d+\] )?(\w{6}\-\w{6}\-\w{2})?/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
    {
    $id_list{$id} = 1 if defined $id_list{$id} ||
      ($insensitive && /$pattern/io) || /$pattern/o;
    }

  # 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{4} )?)(?:\[\d+\] )?\w{6}\-\w{6}\-\w{2} 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' }
};
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 occurrs 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;
  }

# 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.

getopts('Ilvt:',\my %args);
$queue_time  = $args{'t'}? $args{'t'} : -1;
$insensitive = $args{'I'}? 0 : 1;
$invert      = $args{'v'}? 1 : 0;

die "usage: exigrep [-I] [-l] [-t <seconds>] [-v] <pattern> [<log file>]...\n"
  if ($#ARGV < 0);

$pattern = shift @ARGV;
$pattern = quotemeta $pattern if $args{l};


# If file arguments are given, open each one and process according as it is
# is compressed or not.

if (@ARGV)
  {
  foreach (@ARGV)
    {
    my $filename = $_;
    if ($filename =~ /\.(?:gz)$/o)
      {
      open(LOG, "/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 of exigrep

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