/usr/sbin/logtail is in logtail 1.3.14.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 | #!/usr/bin/perl
# Copyright (C) 2003 Jonathan Middleton <jjm@ixtab.org.uk
# Copyright (C) 2001 Paul Slootman <paul@debian.org>
# This file is part of Logcheck.
# Logcheck is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# Logcheck is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with Logcheck; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
use strict;
use warnings;
my ($size, $logfile, $offsetfile);
use Getopt::Std;
my %opts = ();
# process args and switches
my ($TEST_MODE) = 0;
getopts("f:o:t", \%opts);
# try to detect plain logtail invocation without switches
if (!$opts{f} && $#ARGV != 0 && $#ARGV != 1) {
print STDERR "No logfile to read. Use -f [LOGFILE].\n";
exit 66;
} elsif ($#ARGV == 0) {
$logfile = $ARGV[0];
$offsetfile = $opts{o};
} elsif ($#ARGV == 1) {
($logfile, $offsetfile) = ($ARGV[0], $ARGV[1]);
} else {
($logfile, $offsetfile) = ($opts{f}, $opts{o});
}
if ($opts{t}) {
$TEST_MODE = 1;
}
if (! -f $logfile) {
print STDERR "File $logfile cannot be read.\n";
exit 66;
}
unless ($offsetfile) {
# offsetfile not given, use .offset/$logfile in the same directory
$offsetfile = $logfile . '.offset';
}
unless (open(LOGFILE, $logfile)) {
print STDERR "File $logfile cannot be read.\n";
exit 66;
}
my ($inode, $ino, $offset) = (0, 0, 0);
unless (not $offsetfile) {
if (open(OFFSET, $offsetfile)) {
$_ = <OFFSET>;
unless (! defined $_) {
chomp $_;
$inode = $_;
$_ = <OFFSET>;
unless (! defined $_) {
chomp $_;
$offset = $_;
}
}
}
unless ((undef,$ino,undef,undef,undef,undef,undef,$size) = stat $logfile) {
print STDERR "Cannot get $logfile file size.\n", $logfile;
exit 65;
}
if ($inode == $ino) {
exit 0 if $offset == $size; # short cut
if ($offset > $size) {
$offset = 0;
print "***************\n";
print "*** WARNING ***: Log file $logfile is smaller than last time checked!\n";
print "*************** This could indicate tampering.\n";
}
}
if ($inode != $ino || $offset > $size) {
$offset = 0;
}
seek(LOGFILE, $offset, 0);
}
while (<LOGFILE>) {
print $_;
}
$size = tell LOGFILE;
close LOGFILE;
# update offset, unless test mode
unless ($TEST_MODE) {
unless (open(OFFSET, ">$offsetfile")) {
print STDERR "File $offsetfile cannot be created. Check your permissions.\n";
exit 73;
}
print OFFSET "$ino\n$size\n";
close OFFSET;
}
exit 0;
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