src/src/exigrep.src

   1 #! PERL_COMMAND -w
   2 # $Cambridge: exim/src/src/exigrep.src,v 1.3 2005/08/01 13:28:30 ph10 Exp $
   3
   4 use strict;
   5
   6 # Copyright (c) 2004 University of Cambridge.
   7 # See the file NOTICE for conditions of use and distribution.
   8
   9 # Except when they appear in comments, the following placeholders in this
  10 # source are replaced when it is turned into a runnable script:
  11 #
  12 # PERL_COMMAND
  13 # ZCAT_COMMAND
  14 # COMPRESS_SUFFIX
  15
  16 # PROCESSED_FLAG
  17
  18 # This is a perl script which extracts from an Exim log all entries
  19 # for all messages that have an entry that matches a given pattern.
  20 # If *any* entry for a particular message matches the pattern, *all*
  21 # entries for that message are displayed.
  22
  23 # We buffer up information on a per-message basis. It is done this way rather
  24 # than reading the input twice so that the input can be a pipe.
  25
  26 # There must be one argument, which is the pattern. Subsequent arguments
  27 # are the files to scan; if none, the standard input is read. If any file
  28 # appears to be compressed, it is passed through zcat. We can't just do this
  29 # for all files, because zcat chokes on non-compressed files.
  30
  31 use Getopt::Std qw(getopts);
  32 use POSIX qw(mktime);
  33
  34
  35 # This subroutine converts a time/date string from an Exim log line into
  36 # the number of seconds since the epoch. It handles optional timezone
  37 # information.
  38
  39 sub seconds {
  40 my($year,$month,$day,$hour,$min,$sec,$tzs,$tzh,$tzm) =
  41   $_[0] =~ /^(\d{4})-(\d\d)-(\d\d)\s(\d\d):(\d\d):(\d\d)(?>\s([+-])(\d\d)(\d\d))?/;
  42
  43 my $seconds = mktime $sec, $min, $hour, $day, $month - 1, $year - 1900;
  44
  45 if (defined $tzs)
  46   {
  47   $seconds -= $tzh * 3600 + $tzm * 60 if $tzs eq "+";
  48   $seconds += $tzh * 3600 + $tzm * 60 if $tzs eq "-";
  49   }
  50
  51 return $seconds;
  52 }
  53
  54
  55 # This subroutine processes a single line (in $_) from a log file. Program
  56 # defensively against short lines finding their way into the log.
  57
  58 my (%saved, %id_list, $pattern, $queue_time);
  59
  60 sub do_line {
  61
  62 # Convert syslog lines to mainlog format, as in eximstats.
  63
  64 if (! /^\\d{4}/) { $_ =~ s/^.*? exim\b.*?: //; }
  65
  66 return unless
  67   my($date,$entry) = /^(\d{4}-\d\d-\d\d \d\d:\d\d:\d\d (?:[+-]\d{4} )?)(.*)/;
  68
  69 # Handle the case when the log line belongs to a specific message. We save
  70 # lines for specific messages until the message is complete. Then either print
  71 # discard.
  72
  73 if (my($id) = $entry =~ /^(\w{6}\-\w{6}\-\w{2})/)
  74   {
  75   $saved{$id} = '' unless defined($saved{$id});
  76
  77   # Save up the data for this message in case it becomes interesting later.
  78
  79   $saved{$id} .= $_;
  80
  81   # Are we interested in this id ?
  82
  83   $id_list{$id} = 1 if /$pattern/io;
  84
  85   # See if this is a completion for some message. If it is interesting,
  86   # print it, but in any event, throw away what was saved.
  87
  88   if ($entry =~
  89         /(?:Completed|rejected (?:by local_scan|by non-SMTP ACL|after DATA))/)
  90     {
  91     if ($saved{$id} =~ /^(\d{4}-\d\d-\d\d \d\d:\d\d:\d\d ([+-]\d{4} )?)(\w{6}\-\w{6}\-\w{2})/)
  92       {
  93       my $old_sec = &seconds($1);
  94       my $sec = &seconds($date);
  95       delete $id_list{$id} if $id_list{$id} && $sec - $old_sec <= $queue_time;
  96       }
  97
  98     if ($id_list{$id})
  99       {
 100       delete $id_list{$id};
 101       print "$saved{$id}\n";
 102       }
 103
 104     delete $saved{$id};
 105     }
 106   }
 107
 108 # Handle the case where the log line does not belong to a specific message.
 109 # Print it if it is interesting.
 110
 111 elsif ($entry =~ /$pattern/io) { print "$_\n"; }
 112 }
 113
 114
 115 # The main program. Extract the pattern and make sure any relevant characters
 116 # are quoted if the -l flag is given. The -t flag gives a time-on-queue value
 117 # which is an additional condition.
 118
 119 getopts('lt:',\my %args);
 120 $queue_time = $args{'t'}? $args{'t'} : -1;
 121
 122 die "usage: exigrep [-l] [-t <seconds>] <pattern> [<log file>]...\n"
 123   if ($#ARGV < 0);
 124
 125 $pattern = shift @ARGV;
 126 $pattern = quotemeta $pattern if $args{l};
 127
 128
 129 # If file arguments are given, open each one and process according as it is
 130 # is compressed or not.
 131
 132 if (@ARGV)
 133   {
 134   foreach (@ARGV)
 135     {
 136     my $filename = $_;
 137     if ($filename =~ /\.(?:COMPRESS_SUFFIX)$/)
 138       {
 139       open(LOG, "ZCAT_COMMAND $filename |") ||
 140         die "Unable to zcat $filename: $!\n";
 141       }
 142     else
 143       {
 144       open(LOG, "<$filename") || die "Unable to open $filename: $!\n";
 145       }
 146     do_line() while (<LOG>);
 147     close(LOG);
 148     }
 149   }
 150
 151 # If no files are named, process STDIN only
 152
 153 else { do_line() while (<STDIN>); }
 154
 155 # At the end of processing all the input, print any uncompleted data
 156
 157 for (keys %id_list) { print "+++ $_ not completed +++\n$saved{$_}\n;" }
 158
 159 # End of exigrep