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#!/usr/bin/perl -Tw
# $Id$
# nagios check for debian (security) updates,
# based on net-snmp glue to security updates via apt-get.
# Copyright (C) 2004 SILVER SERVER Gmbh
# Copyright (C) 2004, 2005, 2006, 2007, 2008 Peter Palfrader
#
# This program 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.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
# USA
use strict;
use English;
use Getopt::Long;
use IO::Handle;
use IPC::Open2;
$ENV{'PATH'} = '/bin:/sbin:/usr/bin:/usr/sbin';
delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};
my $APT = '/usr/bin/apt-get';
my $VERBOSE;
sub do_check($$$$$$) {
my ($pre_command, $timeout, $noupdate, $name, $updates_security, $updates_other) = @_;
my $fh;
my $pid;
my @command;
unless ($noupdate) {
print STDERR "Running $APT update in $name\n" if $VERBOSE;
@command = ($APT, 'update');
unshift @command, @$pre_command;
$fh = new IO::Handle;
$pid = open2($fh, \*STDIN, @command) or die ("Cannot run $APT update in $name: $!\n");
local $SIG{ALRM} = sub { die "Timeout for apt-get update.\n" };
alarm $timeout;
my @ignore=<$fh>;
alarm 0;
close $fh;
waitpid $pid, 0;
if ($CHILD_ERROR) { # program failed
die("$APT update returned with non-zero exit code in $name: ".($CHILD_ERROR / 256)."\n");
};
};
print STDERR "Running $APT --simulate upgrade in $name\n" if $VERBOSE;
@command = ($APT, qw{--simulate upgrade});
unshift @command, @$pre_command;
$fh = new IO::Handle;
$pid = open2($fh, \*STDIN, @command) or die ("Cannot run $APT --simulate upgrade | sort -u in $name: $!\n");
local $SIG{ALRM} = sub { die "Timeout for apt-get --simulate upgrade.\n" };
alarm $timeout;
my @lines=<$fh>;
close $fh;
alarm 0;
waitpid $pid, 0;
if ($CHILD_ERROR) { # program failed
die("$APT --simulate upgrade | sort -u returned with non-zero exit code in $name: ".($CHILD_ERROR / 256)."\n");
};
@lines = sort {$a cmp $b} @lines;
my %uniq;
@lines = grep {!$uniq{$_}++} @lines;
print STDERR "Processing information for $name\n" if $VERBOSE;
for my $line (@lines) {
if ($line =~ m/^Inst\s+(\S+)\s+/) {
my $package = $1;
if ($line =~ m/^Inst\s+\S+\s+.*security/i) {
push @$updates_security, $package.($name ne '/' ? "($name)" : '');
} else {
push @$updates_other, $package.($name ne '/' ? "($name)" : '');
};
}
}
}
my $VERSION = '0.0.3 - $Rev$';
my $use_sudo = 1;
my $params;
# nagios exit codes
my $OK = 0;
my $WARNING = 1;
my $CRITICAL = 2;
my $UNKNOWN = 3;
$params->{'chroots'} = [];
$params->{'vservers'} = [];
$params->{'timeout'} = 20;
Getopt::Long::config('bundling');
if (!GetOptions (
'--help' => \$params->{'help'},
'--version' => \$params->{'version'},
'--sudo' => \$params->{'sudo'},
'--noupdate' => \$params->{'noupdate'},
'--nosudo' => \$params->{'nosudo'},
'--verbose' => \$params->{'verbose'},
'--warnifupdates' => \$params->{'warnifupdates'},
'--timeout=i' => \$params->{'timeout'},
'--chroot=s' => $params->{'chroots'},
'--vserver=s' => $params->{'vservers'}
)) {
die ("Usage: $PROGRAM_NAME [--help|--version] [--sudo|--nosudo] [--timeout=<timeout>] [--verbose]\n");
};
if ($params->{'help'}) {
print "nagios-check-apt-updates $VERSION\n";
print "Usage: $PROGRAM_NAME [--help|--version] [--sudo|--nosudo] [--verbose]\n";
print "Reports packages to upgrade, updating the list if necessary.\n";
print "\n";
print " --help Print this short help.\n";
print " --version Report version number.\n";
print " --sudo Use sudo to call apt-get (default).\n";
print " --noupdate Do not run apt-get update first.\n";
print " --nosudo Do not use sudo to call apt-get.\n";
print " --warnifupdates Exit with a WARNING status if any updates are available.\n";
print " --timeout=<timeout> Timeout in seconds for each of the two apt-get runs.\n";
print " --verbose Be a little verbose.\n";
print " --chroot=<path> Run check in path.\n";
print " --vserver=<vserver> Run check in vserver.\n";
print "\n";
print "Note that for --sudo (default) you will need entries in /etc/sudoers like these:\n";
print "nagios ALL=(ALL) NOPASSWD: /usr/bin/apt-get update\n";
print "nagios ALL=(ALL) NOPASSWD: /usr/bin/apt-get --simulate upgrade\n";
print "nagios ALL=(ALL) NOPASSWD: /usr/sbin/chroot /chroot-ia32 /usr/bin/apt-get update\n";
print "nagios ALL=(ALL) NOPASSWD: /usr/sbin/chroot /chroot-ia32 /usr/bin/apt-get --simulate upgrade\n";
print "nagios ALL=(ALL) NOPASSWD: /usr/sbin/vserver phpserver exec /usr/bin/apt-get update\n";
print "nagios ALL=(ALL) NOPASSWD: /usr/sbin/vserver phpserver exec /usr/bin/apt-get --simulate upgrade\n";
print "\n";
exit (0);
};
if ($params->{'version'}) {
print "nagios-check-apt-updates $VERSION\n";
print "nagios check for availability of debian (security) updates\n";
print "Copyright (c) 2004 SILVER SERVER Gmbh\n";
print "Copyright (c) 2004,2005 Peter Palfrader <peter\@palfrader.org>\n";
exit (0);
};
if ($params->{'sudo'} && $params->{'nosudo'}) {
die ("$PROGRAM_NAME: --sudo and --nosudo are mutually exclusive.\n");
};
if ($params->{'sudo'}) {
$use_sudo = 1;
};
if ($params->{'nosudo'}) {
$use_sudo = 0;
};
if (scalar @{$params->{'chroots'}} == 0 && scalar @{$params->{'vservers'}} == 0) {
$params->{'chroots'} = ['/'];
};
$VERBOSE = $params->{'verbose'};
$SIG{'__DIE__'} = sub {
print STDERR @_;
exit $UNKNOWN;
};
my @updates_security;
my @updates_other;
# Make sure chroot paths are nice;
my @chroots = ();
for my $root (@{$params->{'chroots'}}) {
if ($root =~ m#^(/[a-zA-Z0-9/.-]*)$#) {
push @chroots, $1;
} else {
die ("Chroot path $root is not nice.\n");
};
};
for my $root (@chroots) {
my @pre_command = ();
unshift @pre_command, 'chroot', $root if ($root ne '/');
unshift @pre_command, 'sudo' if $use_sudo;
do_check(\@pre_command, $params->{'timeout'}, $params->{'noupdate'}, $root, \@updates_security, \@updates_other);
}
# Make sure vserver names are nice;
my @vservers = ();
for my $vserver (@{$params->{'vservers'}}) {
if ($vserver =~ m#^([a-zA-Z0-9.-]+)$#) {
push @vservers, $1;
} else {
die ("Vserver name $vserver is not nice.\n");
};
};
for my $vserver (@vservers) {
my @pre_command = ();
unshift @pre_command, '/usr/sbin/vserver', $vserver, 'exec';
unshift @pre_command, 'sudo' if $use_sudo;
do_check(\@pre_command, $params->{'timeout'}, $params->{'noupdate'}, $vserver, \@updates_security, \@updates_other);
}
my $exit = $OK;
my $updateinfo;
if (@updates_security) {
$updateinfo .= 'Security updates ('.(scalar @updates_security).'): '.join(', ', @updates_security)."; ";
$exit = $CRITICAL;
}
if (@updates_other) {
$updateinfo .= 'Other Updates ('.(scalar @updates_other).'): '.join(', ', @updates_other)."; ";
$exit = $WARNING if ($params->{'warnifupdates'} and $exit == $OK);
};
$updateinfo = 'No updates available' unless defined $updateinfo;
print $updateinfo,"\n";
exit $exit;
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