130 lines
4.1 KiB
Perl
130 lines
4.1 KiB
Perl
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#!/usr/bin/perl -wT
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# check_rrd_data plugin for nagios
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#
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# usage:
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# check_rrd machine_id perlexp_warn perlexp_crit perlexp_default [ds]
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#
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# Checks data from a RRD file. machine_id is normally an IP address, that has
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# to be mapped to a RRD file, by means of the config file (by default
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# /var/spool/nagios/rrd-files, a file with pairs of (machine_id,rrd_file),
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# separated by whitespace). It can be a RRD file, too.
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#
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# The Perl expressions are expressions to be evaluated in the following cases:
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#
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# - perlexp_crit. The first one, to check if there is a critical situation. If
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# it returns other than "", it will be a critical message.
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# - perlexp_warn. The second one to be evaluated. If returns other than "", a
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# warning will be issued to Nagios.
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# - perlexp_default. If both of the above return "", it will be evaluated, and
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# wathever returns this expression will be returned by the script. NOTE that
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# this is different from the other two cases, to allow the user issue a
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# warning or critical failure even if the other two don't return it.
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#
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# Use these hosts.cfg entries as examples
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#
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# command[check_ping]=$USER1$/check_rrd_data.pl $HOSTADDRESS$ \
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# 'return "CHECK_CRICKET_PING: Warning\n" if ($value > 10);' 'return \
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# "CHECK_CRICKET_PING: Critical\n" if ($value > 100);' 'printf \
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# "PING OK - RTA = %.2fms\n", $value; return 0;' 1
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# service[machine]=PING;0;24x7;3;5;1;router-admins;240;24x7;1;1;1;;check_ping
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#
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# initial version: 28 Nov 2000 by Esteban Manchado Vel<65>zquez
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# current status: 0.1
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#
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# Copyright Notice: GPL
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#
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# Doesn't work! Why?
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# BEGIN {
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# my $runtimedir = substr($0,0,rindex($0,'/'));
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# require "$runtimedir/utils.pm";
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# }
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require '/usr/libexec/nagios/plugins/utils.pm';
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use RRD::File;
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# use strict; # RRD:File and utils.pm don't like this
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my $configfilepath = "/var/spool/nagios/rrd-files"; # Change if needed
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my %hostfile; # For storing config
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my $rrdfile; # RRD file to open
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$ENV{'PATH'} = "/bin:/usr/bin";
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$ENV{'ENV'} = "";
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if (scalar @ARGV != 4 && scalar @ARGV != 5) {
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print STDERR join "' '", @ARGV, "\n";
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my $foo = 'check_rrd_data';
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print STDERR $foo, " <file.rrd> <perl_exp_warn> <perl_exp_crit> <perl_exp_default> [<ds>]\n\n";
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print STDERR "<perl_exp_*> is an expression that gets evaluated with \$_ at the current\n";
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print STDERR "value of the data source. If it returns something other than \"\", there\n";
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print STDERR "will be a warning or a critical failure. Else, the expression\n";
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print STDERR "<perl_exp_default> will be evaluated\n";
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exit;
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}
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# Check configuration file
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open F, $configfilepath or do {
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print "Can't open config file $configfilepath\n";
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return $ERRORS{'UNKNOWN'};
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};
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while (<F>) {
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next unless /(.+)\s+(.+)/;
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$hostfile{$1} = $2;
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}
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close F;
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# Default
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my $ds = defined $ARGV[4]?$ARGV[4]:0;
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# print "\$ds = " . $ds . ":";
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# print "\$ARGV[4] = " . $ARGV[4] . ":";
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$ds =~ s/\$//g; # Sometimes Nagios gives 1$ as the last parameter
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# Guess which RRD file have to be opened
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$rrdfile = $ARGV[0] if (-r $ARGV[0]); # First the parameter
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$rrdfile = $hostfile{$ARGV[0]} unless $rrdfile; # Second, the config file
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# print "$ARGV[0]:";
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if (! $rrdfile) {
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print "Can't open data file for $ARGV[0]\n"; # Aaaargh!
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return $ERRORS{'UNKNOWN'}; # Unknown
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}
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# print "Opening file $rrdfile:";
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my $rrd = new RRD::File ( -file => $rrdfile );
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$rrd->open();
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if (! $rrd->loadHeader()) {
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print "Couldn't read header from $rrdfile\n";
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exit $ERRORS{'UNKNOWN'}; # Unknown
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}
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my $value = $rrd->getDSCurrentValue($ds);
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$rrd->close();
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# Perl expressions to evaluate
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my ($perl_exp_warn, $perl_exp_crit, $perl_exp_default) =
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($ARGV[1], $ARGV[2], $ARGV[3]);
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my $result; # Result of the expressions (will be printed)
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my @data; # Special data reserved for the expressions, to pass data
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# First check for critical errors
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$perl_exp_crit =~ /(.*)/;
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$perl_exp_crit = $1;
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$result = eval $perl_exp_crit;
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if ($result) {
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print $result;
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exit 2; # Critical
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}
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# Check for warnings
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$perl_exp_warn =~ /(.*)/;
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$perl_exp_warn = $1;
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$result = eval $perl_exp_warn;
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if ($result) {
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print $result;
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exit 1; # Warning
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}
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$perl_exp_default =~ /(.*)/;
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$perl_exp_default = $1;
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eval $perl_exp_default; # Normally returns 0 (OK)
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