190 lines
4.5 KiB
Perl
Executable File
190 lines
4.5 KiB
Perl
Executable File
#!/usr/bin/perl -w
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# Plugin to monitor offsets to multiple NTP peers.
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# NB currently only works for IPv4 peers
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#
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# (c)2008 Chris Hastie: chris (at) oak (hyphen) wood (dot) co (dot) uk
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#
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# Parameters understood:
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#
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# config (required)
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# autoconf (optional - used by munin-node-configure)
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#
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# Config variables:
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#
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# ntpq - path to ntpq program
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# Change log
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# v1.0.0 2008-07-21 Chris Hastie
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# initial release
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# v1.0.1 2009-06-05 Tony Hoyle
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# ipv6 support. Remove dns lookups.
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#
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#
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# Magic markers - optional - used by installation scripts and
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# munin-node-configure:
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#
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#%# family=contrib
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#%# capabilities=autoconf
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#
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use strict;
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my $NTPQ = $ENV{ntpq} || "ntpq";
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my $COMMAND = "$NTPQ -nc associations";
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my $statedir = $ENV{statedir} || '/usr/local/var/munin/plugin-state';
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my $statefile = "$statedir/ntp_peers.state";
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# autoconf
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if ($ARGV[0] and $ARGV[0] eq "autoconf") {
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`$NTPQ -c help >/dev/null 2>/dev/null`;
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if ($? eq "0") {
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if (`$NTPQ -np | wc -l` > 0) {
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print "yes\n";
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exit 0;
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} else {
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print "no (unable to list peers)\n";
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exit 1;
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}
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} else {
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print "no (ntpq not found)\n";
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exit 1;
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}
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}
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my %peers;
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# get data from ntpq
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open(SERVICE, "$COMMAND |")
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or die("Could not execute '$COMMAND': $!");
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while (<SERVICE>) {
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if(/^\s*\d+\s+(\d+)\s+/) {
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my ($name, $offset) = &lookupip($1);
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$peers{$name} = $offset;
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}
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}
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close(SERVICE);
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# config
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if ($ARGV[0] and $ARGV[0] eq 'config') {
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print "graph_title NTP peer offsets\n";
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print "graph_args --base 1000\n";
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print "graph_vlabel ms\n";
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print "graph_category time\n";
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print "graph_info Offset (in ms) to the server's NTP peers\n";
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print "graph_order ";
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foreach my $key (sort keys %peers) {
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print &sanitize_field($key) . " ";
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}
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print "\n";
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foreach my $peer (keys %peers) {
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print &sanitize_field($peer) . ".label " . $peer . "\n";
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}
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exit 0;
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}
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# send output
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foreach my $peer (keys %peers) {
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print &sanitize_field($peer) . ".value " . &getpeeroffset($peer) . "\n";
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}
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# create a valid munin field name from the hostname
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sub sanitize_field () {
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my $field = shift;
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# replace illegal characters with an underscore
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$field =~ s/[^A-Za-z0-9_]/_/g;
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# prepend an underscore if name starts with a number
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$field =~ s/^([^A-Za-z_])/_$1/;
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# truncate to 19 characters
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if (length($field) > 19) {
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$field = substr($field, 0, 19);
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}
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return $field
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}
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# get an IP address from the underscore escaped
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# value of env.hostname_<key>
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sub desanitize_field () {
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my $field = shift;
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$field =~ s/_/\./g;
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return $field
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}
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# Get name, offset info for peers
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# It would be more efficient to use mrv here to avoid rerunning ntpq
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sub lookupip() {
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my $assocID = shift;
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my $CMD = "$NTPQ -c \"rv $assocID srcadr,offset\"";
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my $addr="";
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my $offset="";
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# get data from ntpq
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open(SERVICE2, "$CMD |")
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or die("Could not execute '$CMD': $!");
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while(<SERVICE2>) {
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if(/^srcadr=([^\s]+),\soffset=(.+)$/) {
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$addr = $1;
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$offset = $2;
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}
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}
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close(SERVICE2);
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return ($addr, $offset);
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}
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# returns the offset, or U if it is undefined
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sub getpeeroffset() {
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my $name = shift;
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my $rtn = 'U';
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if (exists($peers{$name})) {
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$rtn = $peers{$name};
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}
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return $rtn
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}
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=pod
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=head1 Description
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ntp_peers - A munin plugin to monitor offsets to multiple NTP peers and
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graph them on a single graph
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=head1 Parameters understood:
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config (required)
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autoconf (optional - used by munin-node-configure)
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=head1 Configuration variables:
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All configuration parameters are optional
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ntpq - path to ntpq program
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statedir - directory in which to place state file
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hostname_<key> - override hostname for peer <key>. <key> is
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an IPv4 address with dots replaced by underscores.
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Useful for reference clocks, eg
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env.hostname_127_127_43_0 .GPS.
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=head1 Known issues
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ntp_peers will not monitor IPv6 peers
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=cut
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