added the new option 'extra_args' in 'ntp.pm' to be able to include extra arguments to the command executed

Changes

@@ -1,6 +1,9 @@
 N.N.N  - DD-MMM-2015
 ====================
 - Added support in ZFS graph for versions older than 0.6.4.
+- Added the new option 'extra_args' in 'ntp.pm' to be able to include extra
+  arguments to the command executed by Monitorix.
+	(suggested by Matti Pentti, Matti.Pentti AT cimcorp.com)
 - Fixed a missing identifier in sprintf(). [#109]
 - Fixed a message of 'use of uninitialized value' in 'port.pm'. [#110]
 - Fixed the Y-axis title in 'fail2ban.pm'. [#111]

lib/ntp.pm

@@ -136,6 +136,7 @@ sub ntp_update {
 	my ($package, $config, $debug) = @_;
 	my $rrd = $config->{base_lib} . $package . ".rrd";
 	my $ntp = $config->{ntp};
+	my $args = $ntp->{extra_args} || "";
 
 	my @data;
 	my $del;
@@ -150,7 +151,7 @@ sub ntp_update {
 	my $e = 0;
 	foreach my $h (split(',', $ntp->{list})) {
 		$h = trim($h);
-		open(IN, "ntpq -pn $h |");
+		open(IN, "ntpq -pn $args $h |");
 		@data = <IN>;
 		close(IN);
 		$cod = $str = $del = $off = $jit = 0;

man/man5/monitorix.conf.5

@@ -1827,6 +1827,17 @@ For more information on these NTP codes:
 .P
 The maximum number of codes allowed for each hostname is 10.
 .RE
+.P
+.BI extra_args
+.RS
+This option includes any extra argument to the NTP command executed by Monitorix, which is "ntpq -pn". This is specially useful if you want to force using IPv4, in this case just define this option like this:
+.P
+.RS
+extra_args = "-4"
+.RE
+.P
+Monitorix will add this extra argument to the NTP command which will become as "ntpq -pn -4".
+.RE
 .SS Fail2ban statistics (fail2ban.rrd)
 This graph is able to monitor an unlimited number of Fail2ban jails.
 .P