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diff --git a/contrib/check_rrd_data.pl b/contrib/check_rrd_data.pl
new file mode 100644
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@@ -0,0 +1,129 @@
+#!/usr/bin/perl -wT
+
+# check_rrd_data plugin for nagios
+#
+# usage:
+#    check_rrd machine_id perlexp_warn perlexp_crit perlexp_default [ds]
+#
+# Checks data from a RRD file. machine_id is normally an IP address, that has
+# to be mapped to a RRD file, by means of the config file (by default
+# /var/spool/nagios/rrd-files, a file with pairs of (machine_id,rrd_file),
+# separated by whitespace). It can be a RRD file, too.
+#
+# The Perl expressions are expressions to be evaluated in the following cases:
+#
+# - perlexp_crit. The first one, to check if there is a critical situation. If
+# it returns other than "", it will be a critical message.
+# - perlexp_warn. The second one to be evaluated. If returns other than "", a
+# warning will be issued to Nagios.
+# - perlexp_default. If both of the above return "", it will be evaluated, and
+# wathever returns this expression will be returned by the script. NOTE that
+# this is different from the other two cases, to allow the user issue a
+# warning or critical failure even if the other two don't return it.
+#
+# Use these hosts.cfg entries as examples
+#
+# command[check_ping]=$USER1$/check_rrd_data.pl $HOSTADDRESS$ \
+#       'return "CHECK_CRICKET_PING: Warning\n" if ($value > 10);' 'return \
+#       "CHECK_CRICKET_PING: Critical\n" if ($value > 100);' 'printf \
+#       "PING OK - RTA = %.2fms\n", $value; return 0;' 1
+# service[machine]=PING;0;24x7;3;5;1;router-admins;240;24x7;1;1;1;;check_ping
+#
+# initial version: 28 Nov 2000 by Esteban Manchado Velázquez
+# current status: 0.1
+#
+# Copyright Notice: GPL
+#
+
+# Doesn't work! Why?
+# BEGIN {
+        # my $runtimedir = substr($0,0,rindex($0,'/'));
+        # require "$runtimedir/utils.pm";
+# }
+
+require '/usr/libexec/nagios/plugins/utils.pm';
+use RRD::File;
+# use strict;                   # RRD:File and utils.pm don't like this
+
+my $configfilepath = "/var/spool/nagios/rrd-files";     # Change if needed
+my %hostfile;                                           # For storing config
+my $rrdfile;                                            # RRD file to open
+
+$ENV{'PATH'} = "/bin:/usr/bin";
+$ENV{'ENV'} = "";
+
+if (scalar @ARGV != 4 && scalar @ARGV != 5) {
+        print STDERR join "' '", @ARGV, "\n";
+        my $foo = 'check_rrd_data';
+        print STDERR $foo, " <file.rrd> <perl_exp_warn> <perl_exp_crit> <perl_exp_default> [<ds>]\n\n";
+        print STDERR "<perl_exp_*> is an expression that gets evaluated with \$_ at the current\n";
+        print STDERR "value of the data source. If it returns something other than \"\", there\n";
+        print STDERR "will be a warning or a critical failure. Else, the expression\n";
+        print STDERR "<perl_exp_default> will be evaluated\n";
+        exit;
+}
+
+# Check configuration file
+open F, $configfilepath or do {
+        print "Can't open config file $configfilepath\n";
+        return $ERRORS{'UNKNOWN'};
+};
+while (<F>) {
+        next unless /(.+)\s+(.+)/;
+        $hostfile{$1} = $2;
+}
+close F;
+
+# Default
+my $ds = defined $ARGV[4]?$ARGV[4]:0;
+        # print "\$ds = " . $ds . ":";
+        # print "\$ARGV[4] = " . $ARGV[4] . ":";
+$ds =~ s/\$//g;         # Sometimes Nagios gives 1$ as the last parameter
+
+# Guess which RRD file have to be opened
+$rrdfile = $ARGV[0] if (-r $ARGV[0]);           # First the parameter
+$rrdfile = $hostfile{$ARGV[0]} unless $rrdfile; # Second, the config file
+        # print "$ARGV[0]:";
+
+if (! $rrdfile) {
+        print "Can't open data file for $ARGV[0]\n";    # Aaaargh!
+        return $ERRORS{'UNKNOWN'};      # Unknown
+}
+
+        # print "Opening file $rrdfile:";
+my $rrd = new RRD::File ( -file => $rrdfile );
+$rrd->open();
+if (! $rrd->loadHeader()) {
+        print "Couldn't read header from $rrdfile\n";
+        exit $ERRORS{'UNKNOWN'};        # Unknown
+}
+my $value = $rrd->getDSCurrentValue($ds);
+$rrd->close();
+
+# Perl expressions to evaluate
+my ($perl_exp_warn, $perl_exp_crit, $perl_exp_default) =
+                ($ARGV[1], $ARGV[2], $ARGV[3]);
+my $result;     # Result of the expressions (will be printed)
+my @data;       # Special data reserved for the expressions, to pass data
+
+# First check for critical errors
+$perl_exp_crit =~ /(.*)/;
+$perl_exp_crit = $1;
+$result = eval $perl_exp_crit;
+if ($result) {
+        print $result;
+        exit 2;         # Critical
+}
+
+# Check for warnings
+$perl_exp_warn =~ /(.*)/;
+$perl_exp_warn = $1;
+$result = eval $perl_exp_warn;
+if ($result) {
+        print $result;
+        exit 1;         # Warning
+}
+
+$perl_exp_default =~ /(.*)/;
+$perl_exp_default = $1;
+eval $perl_exp_default; # Normally returns 0 (OK)