3 # Copyright 2006, 2012 Peter Palfrader
6 # Permission is hereby granted, free of charge, to any person obtaining
7 # a copy of this software and associated documentation files (the
8 # "Software"), to deal in the Software without restriction, including
9 # without limitation the rights to use, copy, modify, merge, publish,
10 # distribute, sublicense, and/or sell copies of the Software, and to
11 # permit persons to whom the Software is furnished to do so, subject to
12 # the following conditions:
14 # The above copyright notice and this permission notice shall be
15 # included in all copies or substantial portions of the Software.
17 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20 # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
21 # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
22 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
23 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
30 NAGIOS_STATUS = { :OK => 0, :WARNING => 1, :CRITICAL => 2, :UNKNOWN => -1 };
32 @additional_nameservers = []
33 @check_soa_nameservers = true;
35 def show_help(parser, code=0, io=STDOUT)
36 program_name = File.basename($0, '.*')
37 io.puts "Usage: #{program_name} [options] <domainname> [<domainname> ...]"
38 io.puts parser.summarize
41 ARGV.options do |opts|
42 opts.on_tail("-h", "--help" , "Display this help screen") { show_help(opts) }
43 opts.on("-v", "--verbose" , String, "Be verbose") { @verbose += 1 }
44 opts.on("-a", "--add=HOST" , String, "Also check SOA on <nameserver>") { |val| @additional_nameservers << val }
45 opts.on("-n", "--no-soa-ns" , String, "Don't query SOA record for list of nameservers") { @check_soa_nameservers = false }
48 show_help(ARGV.options, 1, STDERR) if ARGV.length == 0
50 if @additional_nameservers.count <= 1 and not @check_soa_nameservers
51 program_name = File.basename($0, '.*')
52 STDERR.puts "#{program_name}: Only know about #{@additional_nameservers.count} nameserver(s) and --no-soa-ns specified. I want at least two."
59 def resolve_ns(dns, domain, nameserver)
60 puts "Getting A record for nameserver #{nameserver} for #{domain}" if @verbose > 0
61 arecords = dns.getresources(nameserver, Resolv::DNS::Resource::IN::A)
62 warnings << "Nameserver #{nameserver} for #{domain} has #{arecords.length} A records" if arecords.length != 1
63 addresses = arecords.map { |a| a.address.to_s }
64 puts "Addresses for nameserver #{nameserver} for #{domain}: #{addresses.join(', ')}" if @verbose > 0
71 nameserver_addresses = {}
72 if @check_soa_nameservers
73 nameservers = dns.getresources(domain, Resolv::DNS::Resource::IN::NS)
74 nameservernames = nameservers.collect{ |ns| ns.name.to_s }
75 nameservernames.each do |nameserver|
76 addrs = resolve_ns(dns, domain, nameserver)
77 warnings << "Duplicate nameserver #{nameserver} for #{domain}" if nameserver_addresses[nameserver]
78 nameserver_addresses[nameserver] = addrs
81 @additional_nameservers.each do |ns|
83 ipa = IPAddr.new(ns) # check if it's an address
86 addrs = resolve_ns(dns, domain, ns)
88 warnings << "Duplicate nameserver #{ns} for #{domain}" if nameserver_addresses[ns]
89 nameserver_addresses[ns] = addrs
92 nameserver_addresses.each_pair do |nameserver, addrs|
93 puts "Testing nameserver #{nameserver} for #{domain}" if @verbose > 0
95 puts " Nameserver #{nameserver} is at #{a}" if @verbose > 0
97 resolver = Resolv::DNS.new({:nameserver => a})
98 soas = resolver.getresources(domain, Resolv::DNS::Resource::IN::SOA)
99 rescue SystemCallError => e
100 warnings << "Could not resolve #{domain} on #{nameserver}: #{e.message}"
103 warnings << "Nameserver #{nameserver} for #{domain} returns #{soas.length} SOAs" if soas.length != 1
105 puts " Nameserver #{nameserver} returns serial #{soa.serial} for #{domain}" if @verbose > 0
106 serial << soa.serial unless serial.include? soa.serial
113 warnings << "Found no serials for #{domain}"
115 oks << "#{domain} is at #{serial.first}"
117 warnings << "Nameservers disagree on serials for #{domain}: found #{serial.join(', ')}" if serial.length != 1
122 if warnings.length > 0
123 puts warnings.join('; ')
124 exit NAGIOS_STATUS[:WARNING]
127 exit NAGIOS_STATUS[:OK]