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#!/usr/bin/perl
#
# storage.monitor
#
# Use SNMP to get free disk space from a machine that implements HOSTMIB.
#
# Exits with value of 1 if free space on any host drops below
# the configured value, or exits with the value of 2 if
# there is a "soft" error (SNMP library error, or could not get a
# response from the server).
#
# Requirements:
#
# Requires the UCD SNMP library and G.S. Marzot's Perl SNMP module.
# (Avoid UCSD SNMP 3.6.1, it will cause segfaults. Use 3.6.2+)
#
# Written by Peter Holzleitner
# based heavily on netappfree.monitor by Jim Trocki
#
# Copyright (C) 2000, Peter Holzleitner
# Copyright (C) 1998, Jim Trocki
#
# 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
#
# Version 1.0.0
#
#
use SNMP;
use Getopt::Long;
sub readcf;
sub toKB;
# load only the necessary MIBs:
$ENV{"MIBS"} = 'RFC1213-MIB:HOST-RESOURCES-MIB';
GetOptions (\%opt, "community=s", "timeout=i", "retries=i", "config=s", "list");
die "no host arguments\n" if (@ARGV == 0);
$RET = 0;
@ERRS = ();
@HOSTS = ();
$COMM = $opt{"community"} || "public";
$TIMEOUT = $opt{"timeout"} * 1000 * 1000 || 5000000;
$RETRIES = $opt{"retries"} || 8;
$CONFIG = $opt{"config"} || (-d "/etc/mon" ? "/etc/mon" : "/usr/lib/mon/etc")
. "/storage.cf";
$list = $opt{"list"};
($stDescr, $stUnit, $stSize, $stUsed) = (0..3);
$host = '';
$fsname = '';
$sizeK = 0;
$freeK = 0;
$OK = 0;
readcf ($CONFIG) || die "could not read config: $!\n";
foreach $host (@ARGV) {
next if (!defined $FREE{$host});
if (!defined($s = new SNMP::Session (DestHost => $host,
Timeout => $TIMEOUT, Community => $COMM,
Retries => $RETRIES))) {
$RET = ($RET == 1) ? 1 : 2;
push (@HOSTS, $host);
push (@ERRS, "could not create session to $host: " . $SNMP::Session::ErrorStr);
next;
}
$v = new SNMP::VarList (
['hrStorageDescr'], #
['hrStorageAllocationUnits'], #
['hrStorageSize'], #
['hrStorageUsed'],
);
while (defined $s->getnext($v)) {
last if ($v->[$stDescr]->tag !~ /hrStorageDescr/);
#($stDescr, $stUnit, $stSize, $stUsed) = (0..3);
$fsname = $v->[$stDescr]->val;
$unit = $v->[$stUnit]->val;
$size = $v->[$stSize]->val;
$used = $v->[$stUsed]->val;
$freeK = ($size - $used) * $unit / 1024;
$OK = "(n/conf)";
$needfreeK = $FREE{$host}{$fsname};
if ( $needfreeK ) {
$OK = "OK";
if ( $freeK < $needfreeK ) {
push (@HOSTS, $host);
push (@ERRS, sprintf ("%s:%s: %1.1fMB free", $host, $fsname, $freeK));
$OK = "LOW";
$RET = 1;
}
}
if($list) {
$sizeK = $size * $unit / 1024;
write;
}
} # while(getnext())
if ($s->{ErrorNum}) {
push (@HOSTS, $host);
push (@ERRS, "could not get hrStorageDescr for $host: " . $s->{ErrorStr});
$RET = ($RET == 1) ? 1 : 2;
}
}
if(!$list) {
if ($RET) {
print "@HOSTS\n";
print "\n";
print join("\n", @ERRS), "\n";
}
} # foreach(host)
exit $RET;
#
# read configuration file
#
sub readcf {
my ($f) = @_;
my ($l, $host, $filesys, $free);
open (CF, $f) || return undef;
while (<CF>) {
next if (/^\s*#/ || /^\s*$/);
chomp;
($host, $filesys, $free) = split;
$filesys =~ tr/+/ /; # + replaces space in config files
if (!defined ($FREE{$host}{$filesys} = toKB ($free))) {
die "error free specification, config $f, line $.\n";
}
}
close (CF);
}
sub toKB {
my ($free) = @_;
my ($n, $u);
if ($free =~ /^(\d+\.\d+)(kb|mb|gb)$/i) {
($n, $u) = ($1, "\L$2");
} elsif ($free =~ /^(\d+)(kb|mb|gb)$/i) {
($n, $u) = ($1, "\L$2");
} else {
return undef;
}
return (int ($n * 1024)) if ($u eq "mb");
return (int ($n * 1024 * 1024)) if ($u eq "gb");
int ($n);
}
format STDOUT_TOP =
Host File System KB total KB free OK
----------------------------------------------------------------------------
.
format STDOUT =
@<<<<<<<<<<<<<< @<<<<<<<<<<<<<<<<<<<< @>>>>>>>>>> @>>>>>>>>>> @<<<<<<<
$host, $fsname, $sizeK, $freeK, $OK
.
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