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#!/usr/bin/perl -w
# Copyright (C) 2005, 2006, 2007, 2008, 2012 Peter Palfrader <peter@palfrader.org>
# 2012 Uli Martens <uli@youam.net>
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
use strict;
use English;
use Getopt::Long;
$ENV{'PATH'} = '/bin:/sbin:/usr/bin:/usr/sbin';
delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};
my $LSOF = '/usr/bin/lsof -F0';
my $VERSION = '0.2012042101';
# nagios exit codes
my $OK = 0;
my $WARNING = 1;
my $CRITICAL = 2;
my $UNKNOWN = 3;
my $params;
my $config;
Getopt::Long::config('bundling');
sub dief {
print STDERR @_;
exit $UNKNOWN;
}
if (!GetOptions (
'--help' => \$params->{'help'},
'--version' => \$params->{'version'},
'--quiet' => \$params->{'quiet'},
'--verbose' => \$params->{'verbose'},
'--config=s' => \$params->{'config'},
)) {
dief ("$PROGRAM_NAME: Usage: $PROGRAM_NAME [--help|--version] [--verbose] [--quiet] [--config=<CONFIGFILE>]\n");
};
if ($params->{'help'}) {
print "$PROGRAM_NAME: Usage: $PROGRAM_NAME [--help|--version] [--verbose] [--quiet] [--config=<CONFIGFILE>]\n";
print "Reports processes that are linked against libraries that no longer exist.\n";
print "The optional config file can specify ignore rules - see the sample config file.\n";
exit (0);
};
if ($params->{'version'}) {
print "nagios-check-libs $VERSION\n";
print "nagios check for availability of debian (security) updates\n";
print "Copyright (c) 2005, 2006, 2007, 2008, 2012 Peter Palfrader <peter\@palfrader.org>\n";
exit (0);
};
if (! defined $params->{'config'}) {
$params->{'config'} = '/etc/nagios/check-libs.conf';
} elsif (! -e $params->{'config'}) {
dief("Config file $params->{'config'} does not exist.\n");
}
if (-e $params->{'config'}) {
eval "use YAML::Syck; 1" or dief "you need YAML::Syck (libyaml-syck-perl) to load a config file";
open(my $fh, '<', $params->{'config'}) or dief "Cannot open config file $params->{'config'}: $!";
$config = LoadFile($fh);
close($fh);
if (!(ref($config) eq "HASH")) {
dief("Loaded config is not a hash!\n");
}
} else {
$config = {
'ignorelist' => [
'$path =~ m#^/proc/#',
'$path =~ m#^/var/tmp/#',
'$path =~ m#^/SYS#',
'$path =~ m#^/drm$# # xserver stuff',
'$path =~ m#^/dev/zero#',
'$path =~ m#^/dev/shm/#',
]
};
}
if (! exists $config->{'ignorelist'}) {
$config->{'ignorelist'} = [];
} elsif (! (ref($config->{'ignorelist'}) eq 'ARRAY')) {
dief("Config->ignorelist is not an array!\n");
}
my %processes;
sub getPIDs($$) {
my ($user, $process) = @_;
return join(', ', sort keys %{ $processes{$user}->{$process} });
};
sub getProcs($) {
my ($user) = @_;
return join(', ', map { $_.' ('.getPIDs($user, $_).')' } (sort {$a cmp $b} keys %{ $processes{$user} }));
};
sub getUsers() {
return join('; ', (map { $_.': '.getProcs($_) } (sort {$a cmp $b} keys %processes)));
};
sub inVserver() {
my ($f, $key);
if (-e "/proc/self/vinfo" ) {
$f = "/proc/self/vinfo";
$key = "XID";
} else {
$f = "/proc/self/status";
$key = "s_context";
};
open(F, "< $f") or return 0;
while (<F>) {
my ($k, $v) = split(/: */, $_, 2);
if ($k eq $key) {
close F;
return ($v > 0);
};
};
close F;
return 0;
}
my $INVSERVER = inVserver();
print STDERR "Running $LSOF -n\n" if $params->{'verbose'};
open (LSOF, "$LSOF -n|") or dief ("Cannot run $LSOF -n: $!\n");
my @lsof=<LSOF>;
close LSOF;
if ($CHILD_ERROR) { # program failed
dief("$LSOF -n returned with non-zero exit code: ".($CHILD_ERROR / 256)."\n");
};
my ($process, $pid, $user);
LINE: for my $line (@lsof) {
if ( $line =~ /^p/ ) {
my %fields = map { m/^(.)(.*)$/ ; $1 => $2 } grep { defined $_ and length $_ >1} split /\0/, $line;
$process = $fields{c};
$pid = $fields{p};
$user = $fields{L};
next;
}
unless ( $line =~ /^f/ ) {
dief("UNKNOWN strange line read from lsof\n");
# don't print it because it contains NULL characters...
}
my %fields = map { m/^(.)(.*)$/ ; $1 => $2 } grep { defined $_ and length $_ >1} split /\0/, $line;
my $fd = $fields{f};
my $inode = $fields{i};
my $path = $fields{n};
if ($path =~ m/\.dpkg-/ || $path =~ m/\(deleted\)/ || $path =~ /path inode=/ || $fd eq 'DEL') {
for my $i (@{$config->{'ignorelist'}}) {
my $ignore = eval($i);
next LINE if $ignore;
}
next if ($INVSERVER && ($process eq 'init') && ($pid == 1) && ($user eq 'root'));
if ( $params->{'verbose'} ) {
print STDERR "adding $process($pid) because of [$path]:\n";
print STDERR $line;
}
$processes{$user}->{$process}->{$pid} = 1;
};
};
my $message='';
my $exit = $OK;
if (keys %processes) {
$exit = $WARNING;
$message = 'The following processes have libs linked that were upgraded: '. getUsers()."\n";
} else {
$message = "No upgraded libs linked in running processes\n" unless $params->{'quiet'};
};
print $message;
exit $exit;
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