3 # downloaded from http://dns.measurement-factory.com/tools/nagios-plugins/check_zone_rrsig_expiration.html
4 # on 2010-02-07 by Peter Palfrader
6 # $Id: check_zone_rrsig_expiration,v 1.7 2008/11/25 01:36:36 wessels Exp $
8 # check_zone_rrsig_expiration
10 # nagios plugin to check expiration times of RRSIG records. Reminds
11 # you if its time to re-sign your zone.
13 # Copyright (c) 2008, The Measurement Factory, Inc. All rights reserved.
15 # Redistribution and use in source and binary forms, with or without
16 # modification, are permitted provided that the following conditions
19 # Redistributions of source code must retain the above copyright
20 # notice, this list of conditions and the following disclaimer.
21 # Redistributions in binary form must reproduce the above copyright
22 # notice, this list of conditions and the following disclaimer in the
23 # documentation and/or other materials provided with the distribution.
24 # Neither the name of The Measurement Factory nor the names of its
25 # contributors may be used to endorse or promote products derived
26 # from this software without specific prior written permission.
28 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
31 # FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
32 # COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
33 # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
34 # BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
35 # LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
36 # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
38 # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
39 # POSSIBILITY OF SUCH DAMAGE.
41 # Copyright (c) 2010 Peter Palfrader <peter@palfrader.org>
42 # - various fixes and cleanups
43 # - do more than one zone
44 # Copyright (c) 2012 Peter Palfrader <peter@palfrader.org>
45 # - add -s option to configure udp packet size. default changed from 4k to 1k
46 # Copyright (c) 2013 Peter Palfrader <peter@palfrader.org>
47 # - add -r option to override initial refs.
53 # command_name check-zone-rrsig
54 # command_line /usr/local/libexec/nagios-local/check_zone_rrsig -Z $HOSTADDRESS$
58 # name dns-rrsig-service
59 # check_command check-zone-rrsig
65 # host_name zone.example.com
66 # alias ZONE example.com
70 # use dns-rrsig-service
71 # host_name zone.example.com
78 use Net::DNS::Resolver;
79 use Time::HiRes qw ( gettimeofday tv_interval);
81 use List::Util qw ( shuffle );
85 my ($ticks, $unit) = ($in =~ /^(\d+)([smhdw]?)$/);
87 if ($unit eq 's' || $unit eq '') { }
88 elsif ($unit eq 'm') { $ticks *= 60; }
89 elsif ($unit eq 'h') { $ticks *= 60*60; }
90 elsif ($unit eq 'd') { $ticks *= 60*60*24; }
91 elsif ($unit eq 'w') { $ticks *= 60*60*24*7; }
92 else { die "Invalid unit '$unit' in '$in'\n" }
96 my %opts = (t=>30, s=>1024);
97 getopts('hdt:c:w:s:r:', \%opts);
98 usage() unless scalar @ARGV == 1;
105 my $CRIT = 3 * 3600*24;
106 my $WARN = 7 * 3600*24;
108 $CRIT = convert_time($opts{c}) if defined $opts{c};
109 $WARN = convert_time($opts{w}) if defined $opts{w};
126 @refs = split(/\s*,\s*/, $opts{r}) if (defined $opts{r});
128 $start = [gettimeofday()];
131 $stop = [gettimeofday()];
136 my $res = Net::DNS::Resolver->new;
138 print STDERR "\nRECURSE\n" if $opts{d};
140 foreach my $ns (shuffle @refs) {
141 print STDERR "sending query for $zone RRSIG to $ns\n" if $opts{d};
142 $res->nameserver($ns);
143 $res->udp_timeout($opts{t});
144 $res->udppacketsize($opts{s});
145 $pkt = $res->send($zone, 'RRSIG');
148 critical("No response to seed query") unless $pkt;
149 critical($pkt->header->rcode . " from " . $pkt->answerfrom)
150 unless ($pkt->header->rcode eq 'NOERROR');
152 foreach my $rr ($pkt->authority) {
153 print STDERR $rr->string, "\n" if $opts{d};
154 push (@refs, $rr->nsdname);
155 next unless lc($rr->name) eq lc($zone);
156 add_nslist_to_data($pkt);
167 foreach my $ns (keys %$data) {
168 next if $data->{$ns}->{done};
169 print STDERR "\nQUERY $ns\n" if $opts{d};
171 my $pkt = send_query($zone, 'RRSIG', $ns);
172 add_nslist_to_data($pkt);
173 $data->{$ns}->{queries}->{RRSIG} = $pkt;
175 print STDERR "done with $ns\n" if $opts{d};
176 $data->{$ns}->{done} = 1;
186 foreach my $ns (keys %$data) {
187 print STDERR "\nANALYZE $ns\n" if $opts{d};
188 my $pkt = $data->{$ns}->{queries}->{RRSIG};
189 critical("No response from $ns") unless $pkt;
190 print STDERR $pkt->string if $opts{d};
191 critical($pkt->header->rcode . " from $ns")
192 unless ($pkt->header->rcode eq 'NOERROR');
193 critical("$ns is lame") unless $pkt->header->ancount;
194 foreach my $rr ($pkt->answer) {
195 next unless $rr->type eq 'RRSIG';
196 my $exp = sigrr_exp_epoch($rr);
197 my $T = $rr->typecovered;
198 if (!defined($MAX_EXP_BY_TYPE{$T}->{exp}) || $exp > $MAX_EXP_BY_TYPE{$T}->{exp}) {
199 $MAX_EXP_BY_TYPE{$T}->{exp} = $exp;
200 $MAX_EXP_BY_TYPE{$T}->{ns} = $ns;
205 warning("No nameservers found. Is '$zone' a zone?") if ($nscount < 1);
206 warning("No RRSIGs found") unless %MAX_EXP_BY_TYPE;
209 my $min_type = undef;
210 foreach my $T (keys %MAX_EXP_BY_TYPE) {
211 printf STDERR ("%s RRSIG expires in %.1f days\n", $T, ($MAX_EXP_BY_TYPE{$T}->{exp}-$NOW)/86400) if $opts{d};
212 if (!defined($min_exp) || $MAX_EXP_BY_TYPE{$T}->{exp} < $min_exp) {
213 $min_exp = $MAX_EXP_BY_TYPE{$T}->{exp};
214 $min_ns = $MAX_EXP_BY_TYPE{$T}->{ns};
218 critical("$min_ns has expired RRSIGs") if ($min_exp < $NOW);
219 if ($min_exp - $NOW < ($CRIT)) {
220 my $ND = sprintf "%3.1f days", ($min_exp-$NOW)/86400;
221 critical("$min_type RRSIG expires in $ND at $min_ns")
223 if ($min_exp - $NOW < ($WARN)) {
224 my $ND = sprintf "%3.1f days", ($min_exp-$NOW)/86400;
225 warning("$min_type RRSIG expires in $ND at $min_ns")
227 success(sprintf("No RRSIGs expiring in the next %3.1f days", $WARN/86400));
230 sub sigrr_exp_epoch {
232 die unless $rr->type eq 'RRSIG';
233 my $exp = $rr->sigexpiration;
234 die "bad exp time '$exp'"
235 unless $exp =~ /^(\d\d\d\d)(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)$/;
236 my $exp_epoch = timegm($6,$5,$4,$3,$2-1,$1);
240 sub add_nslist_to_data {
242 foreach my $ns (get_nslist($pkt)) {
243 next if defined $data->{$ns}->{done};
244 print STDERR "adding NS $ns\n" if $opts{d};
245 $data->{$ns}->{done} |= 0;
255 output('WARNING', shift);
260 output('CRITICAL', shift);
267 $stop = [gettimeofday()] unless $stop;
268 my $latency = tv_interval($start, $stop);
269 printf "ZONE %s: %s; (%.2fs) |time=%.6fs;;;0.000000\n",
277 print STDERR "usage: $0 [-d] [-w=<warn>] [-c=<crit>] [-t=<timeout>] <zone>\n";
285 my $res = Net::DNS::Resolver->new;
286 $res->nameserver($server) if $server;
287 $res->udp_timeout($opts{t});
289 $res->udppacketsize($opts{s});
290 my $pkt = $res->send($qname, $qtype);
293 $res->tcp_timeout($opts{t});
294 $pkt = $res->send($qname, $qtype);
301 return () unless $pkt;
302 return () unless $pkt->authority;
304 foreach my $rr ($pkt->authority) {
305 next unless ($rr->type eq 'NS');
306 next unless ($rr->name eq $zone);
307 push(@nslist, lc($rr->nsdname));