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#!/usr/bin/perl -w
# This script is designed to check a backup directory populated with
# subdirectories named after hosts, within which there are backups of various
# types.
#
# Example:
# /home/backup:
# foo.example.com
#
# foo.example.com:
# rdiff-backup .ssh
#
# rdiff-backup:
# root home rdiff-backup-data usr var
#
# There are heuristics to determine the backup type. Currently, the following
# types are supported:
#
# rdiff-backup: assumes there is a rdiff-backup/rdiff-backup-data/backup.log file
# duplicity: assumes there is a dup subdirectory, checks the latest file
# dump files: assumes there is a dump subdirectory, checks the latest file
#
# This script returns output suitable for send_nsca to send the results to
# nagios and should therefore be used like this:
#
# checkbackups.sh | send_nsca -H nagios.example.com
use Getopt::Std;
# XXX: taken from utils.sh from nagios-plugins-basic
my $STATE_OK=0;
my $STATE_WARNING=1;
my $STATE_CRITICAL=2;
my $STATE_UNKNOWN=3;
my $STATE_DEPENDENT=4;
my %ERRORS=(0=>'OK',1=>'WARNING',2=>'CRITICAL',3=>'UNKNOWN',4=>'DEPENDENT');
# gross hack: we look into subdirs to find vservers
my @vserver_dirs = qw{/var/lib/vservers /vservers};
our $opt_d = "/backup";
our $opt_c = 48 * 60 * 60;
our $opt_w = 24 * 60 * 60;
our $opt_v = 0;
our $opt_o;
our $opt_s;
if (!getopts('d:c:w:s:vo')) {
print <<EOF
Usage: $0 [ -d <backupdir> ] [ -c <threshold> ] [ -w <threshold> ] [ -o ] [ -s <host> ] [ -v ]
EOF
;
exit();
}
sub check_rdiff {
my ($host, $dir, $optv) = @_;
my $flag="$dir/rdiff-backup-data/backup.log";
my $extra_msg = '';
my @vservers;
if (open(FLAG, $flag)) {
while (<FLAG>) {
if (/EndTime ([0-9]*).[0-9]* \((.*)\)/) {
$last_bak = $1;
$extra_msg = ' [backup.log]';
$opt_v && print STDERR "found timestamp $1 ($2) in $flag\n";
}
}
if (!$last_bak) {
print_status($host, $STATE_UNKNOWN, "cannot parse $flag for a valid timestamp");
next;
}
} else {
$opt_v && print STDERR "cannot open $flag\n";
}
close(FLAG);
($state, $delta) = check_age($last_bak);
$dir =~ /([^\/]+)\/?$/;
$service = "backups-$1";
print_status($host, $state, "$delta hours old$extra_msg", $service);
foreach my $vserver_dir (@vserver_dirs) {
$vsdir = "$dir/$vserver_dir";
if (opendir(DIR, $vsdir)) {
@vservers = grep { /^[^\.]/ && -d "$vsdir/$_" } readdir(DIR);
$opt_v && print STDERR "found vservers $vsdir: @vservers\n";
closedir DIR;
} else {
$opt_v && print STDERR "no vserver in $vsdir\n";
}
}
my @dom_sufx = split(/\./, $host);
my $dom_sufx = join('.', @dom_sufx[1,-1]);
foreach my $vserver (@vservers) {
print_status("$vserver.$dom_sufx", $state, "$delta hours old$extra_msg, same as parent: $host");
}
}
sub check_age {
my ($last_bak) = @_;
my $t = time();
my $delta = $t - $last_bak;
if ($delta > $opt_c) {
$state = $STATE_CRITICAL;
} elsif ($delta > $opt_w) {
$state = $STATE_WARNING;
} elsif ($delta >= 0) {
$state = $STATE_OK;
}
$delta = sprintf '%.2f', $delta/3600.0;
return ($state, $delta);
}
sub print_status {
my ($host, $state, $message, $service) = @_;
my $state_msg = $ERRORS{$state};
if (!$service) {
$service = 'backups';
}
$line = "$host\t$service\t$state\t$state_msg $message\n";
if ($opt_s) {
$opt_v && print STDERR "sending results to nagios...\n";
open(NSCA, "|/usr/sbin/send_nsca -H $opt_s") or die("cannot start send_nsca: $!\n");
print NSCA $line;
close(NSCA) or warn("could not close send_nsca pipe correctly: $!\n");
}
if (!$opt_s || $opt_v) {
printf $line;
}
}
sub check_flag {
my ($host, $flag) = @_;
my @stats = stat($flag);
if (not @stats) {
print_status($host, $STATE_UNKNOWN, "cannot stat flag $flag");
}
else {
($state, $delta) = check_age($stats[9]);
print_status($host, $state, "$delta hours old");
}
}
my $backupdir= $opt_d;
my @hosts;
if (defined($opt_o)) {
@hosts=qx{hostname -f};
} else {
# XXX: this should be a complete backup registry instead
@hosts=qx{ls $backupdir | grep -v lost+found};
}
chdir($backupdir);
my ($delta, $state, $host);
foreach $host (@hosts) {
chomp($host);
if ($opt_o) {
$dir = $backupdir;
} else {
$dir = $host;
}
my $flag;
if (-d $dir) {
# guess the backup type and find a proper stamp file to compare
@rdiffs = glob("$dir/*/rdiff-backup-data");
foreach $subdir (@rdiffs) {
$subdir =~ s/rdiff-backup-data$//;
$opt_v && print STDERR "inspecting dir $subdir\n";
check_rdiff($host, $subdir, $opt_v);
$flag = 1;
}
if (-d "$dir/dump") {
# XXX: this doesn't check backup consistency
$flag="$dir/dump/" . `ls -tr $dir/dump | tail -1`;
chomp($flag);
check_flag($host, $flag);
} elsif (-d "$dir/dup") {
# XXX: this doesn't check backup consistency
$flag="$dir/dup/" . `ls -tr $dir/dup | tail -1`;
chomp($flag);
check_flag($host, $flag);
} elsif (-r "$dir/rsync.log") {
# XXX: this doesn't check backup consistency
$flag="$dir/rsync.log";
check_flag($host, $flag);
}
if (!$flag) {
print_status($host, $STATE_UNKNOWN, 'unknown system');
}
} else {
print_status($host, $STATE_UNKNOWN, 'no directory');
}
}
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