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
49 # command_name check-zone-rrsig
50 # command_line /usr/local/libexec/nagios-local/check_zone_rrsig -Z $HOSTADDRESS$
54 # name dns-rrsig-service
55 # check_command check-zone-rrsig
61 # host_name zone.example.com
62 # alias ZONE example.com
66 # use dns-rrsig-service
67 # host_name zone.example.com
74 use Net::DNS::Resolver;
75 use Time::HiRes qw ( gettimeofday tv_interval);
77 use List::Util qw ( shuffle );
81 my ($ticks, $unit) = ($in =~ /^(\d+)([smhdw]?)$/);
83 if ($unit eq 's' || $unit eq '') { }
84 elsif ($unit eq 'm') { $ticks *= 60; }
85 elsif ($unit eq 'h') { $ticks *= 60*60; }
86 elsif ($unit eq 'd') { $ticks *= 60*60*24; }
87 elsif ($unit eq 'w') { $ticks *= 60*60*24*7; }
88 else { die "Invalid unit '$unit' in '$in'\n" }
93 getopts('hdt:c:w:', \%opts);
94 usage() unless scalar @ARGV == 1;
101 my $CRIT = 3 * 3600*24;
102 my $WARN = 7 * 3600*24;
104 $CRIT = convert_time($opts{c}) if defined $opts{c};
105 $WARN = convert_time($opts{w}) if defined $opts{w};
123 $start = [gettimeofday()];
126 $stop = [gettimeofday()];
131 my $res = Net::DNS::Resolver->new;
133 print STDERR "\nRECURSE\n" if $opts{d};
135 foreach my $ns (shuffle @refs) {
136 print STDERR "sending query for $zone RRSIG to $ns\n" if $opts{d};
137 $res->nameserver($ns);
138 $res->udp_timeout($opts{t});
139 $res->udppacketsize(4096);
140 $pkt = $res->send($zone, 'RRSIG');
143 critical("No response to seed query") unless $pkt;
144 critical($pkt->header->rcode . " from " . $pkt->answerfrom)
145 unless ($pkt->header->rcode eq 'NOERROR');
147 foreach my $rr ($pkt->authority) {
148 print STDERR $rr->string, "\n" if $opts{d};
149 push (@refs, $rr->nsdname);
150 next unless lc($rr->name) eq lc($zone);
151 add_nslist_to_data($pkt);
162 foreach my $ns (keys %$data) {
163 next if $data->{$ns}->{done};
164 print STDERR "\nQUERY $ns\n" if $opts{d};
166 my $pkt = send_query($zone, 'RRSIG', $ns);
167 add_nslist_to_data($pkt);
168 $data->{$ns}->{queries}->{RRSIG} = $pkt;
170 print STDERR "done with $ns\n" if $opts{d};
171 $data->{$ns}->{done} = 1;
181 foreach my $ns (keys %$data) {
182 print STDERR "\nANALYZE $ns\n" if $opts{d};
183 my $pkt = $data->{$ns}->{queries}->{RRSIG};
184 critical("No response from $ns") unless $pkt;
185 print STDERR $pkt->string if $opts{d};
186 critical($pkt->header->rcode . " from $ns")
187 unless ($pkt->header->rcode eq 'NOERROR');
188 critical("$ns is lame") unless $pkt->header->ancount;
189 foreach my $rr ($pkt->answer) {
190 next unless $rr->type eq 'RRSIG';
191 my $exp = sigrr_exp_epoch($rr);
192 my $T = $rr->typecovered;
193 if (!defined($MAX_EXP_BY_TYPE{$T}->{exp}) || $exp > $MAX_EXP_BY_TYPE{$T}->{exp}) {
194 $MAX_EXP_BY_TYPE{$T}->{exp} = $exp;
195 $MAX_EXP_BY_TYPE{$T}->{ns} = $ns;
200 warning("No nameservers found. Is '$zone' a zone?") if ($nscount < 1);
201 warning("No RRSIGs found") unless %MAX_EXP_BY_TYPE;
204 my $min_type = undef;
205 foreach my $T (keys %MAX_EXP_BY_TYPE) {
206 printf STDERR ("%s RRSIG expires in %.1f days\n", $T, ($MAX_EXP_BY_TYPE{$T}->{exp}-$NOW)/86400) if $opts{d};
207 if (!defined($min_exp) || $MAX_EXP_BY_TYPE{$T}->{exp} < $min_exp) {
208 $min_exp = $MAX_EXP_BY_TYPE{$T}->{exp};
209 $min_ns = $MAX_EXP_BY_TYPE{$T}->{ns};
213 critical("$min_ns has expired RRSIGs") if ($min_exp < $NOW);
214 if ($min_exp - $NOW < ($CRIT)) {
215 my $ND = sprintf "%3.1f days", ($min_exp-$NOW)/86400;
216 critical("$min_type RRSIG expires in $ND at $min_ns")
218 if ($min_exp - $NOW < ($WARN)) {
219 my $ND = sprintf "%3.1f days", ($min_exp-$NOW)/86400;
220 warning("$min_type RRSIG expires in $ND at $min_ns")
222 success(sprintf("No RRSIGs expiring in the next %3.1f days", $WARN/86400));
225 sub sigrr_exp_epoch {
227 die unless $rr->type eq 'RRSIG';
228 my $exp = $rr->sigexpiration;
229 die "bad exp time '$exp'"
230 unless $exp =~ /^(\d\d\d\d)(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)$/;
231 my $exp_epoch = timegm($6,$5,$4,$3,$2-1,$1);
235 sub add_nslist_to_data {
237 foreach my $ns (get_nslist($pkt)) {
238 next if defined $data->{$ns}->{done};
239 print STDERR "adding NS $ns\n" if $opts{d};
240 $data->{$ns}->{done} |= 0;
250 output('WARNING', shift);
255 output('CRITICAL', shift);
262 $stop = [gettimeofday()] unless $stop;
263 my $latency = tv_interval($start, $stop);
264 printf "ZONE %s: %s; (%.2fs) |time=%.6fs;;;0.000000\n",
272 print STDERR "usage: $0 [-d] [-w=<warn>] [-c=<crit>] [-t=<timeout>] <zone>\n";
280 my $res = Net::DNS::Resolver->new;
281 $res->nameserver($server) if $server;
282 $res->udp_timeout($opts{t});
284 $res->udppacketsize(4096);
285 my $pkt = $res->send($qname, $qtype);
288 $res->tcp_timeout($opts{t});
289 $pkt = $res->send($qname, $qtype);
296 return () unless $pkt;
297 return () unless $pkt->authority;
299 foreach my $rr ($pkt->authority) {
300 next unless ($rr->type eq 'NS');
301 next unless ($rr->name eq $zone);
302 push(@nslist, lc($rr->nsdname));