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Add example cmd to header and clean quoting #4

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Add example cmd to header and clean quoting #4

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24 changes: 14 additions & 10 deletions bin/check-dns.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,10 @@
# Note: if testing reverse DNS with -t PTR option,
# results will end with trailing '.' (dot)
#
# EXAMPLES:
# check purple.com A record using the dns server 8.8.8.8
# $ check-dns.rb -s 8.8.8.8 -d purple.com -t A
#
# OUTPUT:
# plain-text
#
Expand All @@ -27,55 +31,55 @@
class DNS < Sensu::Plugin::Check::CLI

option :domain,
:description => "Domain to resolve (or ip if type PTR)",
:description => 'Domain to resolve (or ip if type PTR)',
:short => '-d DOMAIN',
:long => '--domain DOMAIN'

option :type,
:description => "Record type to resolve (A, AAAA, TXT, etc) use PTR for reverse lookup",
:description => 'Record type to resolve (A, AAAA, TXT, etc) use PTR for reverse lookup',
:short => '-t RECORD',
:long => '--type RECORD',
:default => 'A'

option :server,
:description => "Server to use for resolution",
:description => 'Server to use for resolution',
:short => '-s SERVER',
:long => '--server SERVER'

option :result,
:description => "A positive result entry",
:description => 'A positive result entry',
:short => '-r RESULT',
:long => '--result RESULT'

option :warn_only,
:description => "Warn instead of critical on failure",
:description => 'Warn instead of critical on failure',
:short => '-w',
:long => '--warn-only',
:boolean => true

option :debug,
:description => "Print debug information",
:description => 'Print debug information',
:long => '--debug',
:boolean => true

def resolve_domain
if config[:type] == 'PTR'
cmd = "dig #{config[:server] ? "@#{config[:server]}" : ""} -x #{config[:domain]} +short +time=1"
cmd = "dig #{config[:server] ? "@#{config[:server]}" : ''} -x #{config[:domain]} +short +time=1"
else
cmd = "dig #{config[:server] ? "@#{config[:server]}" : ""} #{config[:domain]} #{config[:type]} +short +time=1"
cmd = "dig #{config[:server] ? "@#{config[:server]}" : ''} #{config[:domain]} #{config[:type]} +short +time=1"
end
puts cmd if config[:debug]
output = `#{cmd}`
puts output if config[:debug]
# Trim, split, remove comments and empty lines
entries = output.strip.split("\n").reject{|l| l.match('^;') || l.match('^$')}
entries = output.strip.split("\n").reject { |l| l.match('^;') || l.match('^$') }
puts "Entries: #{entries}" if config[:debug]
entries
end

def run
if config[:domain].nil?
unknown "No domain specified"
unknown 'No domain specified'
else
entries = resolve_domain
if entries.length.zero?
Expand Down