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require 'resolv'
#
# The DNS-protocol test.
#
# This object is instantiated if the parser sees a line such as:
#
###
### DNSHOSTS must run dns for bytemark.co.uk resolving NS as '80.68.80.26,85.17.170.78,80.68.80.27'.
###
#
# The test will fail if the results are not *exactly* as specified. i.e. If there are too
# many results, or too few, we'll alert.
#
#
module Custodian
module ProtocolTest
class DNSTest < TestFactory
#
# The line from which we were constructed.
#
attr_reader :line
#
# Name to resolve, type to resolve, and expected results
#
attr_reader :resolve_name, :resolve_type, :resolve_expected
#
# Constructor
#
def initialize( line )
#
# Save the line
#
@line = line
#
# Is this test inverted?
#
if ( line =~ /must\s+not\s+run\s+/ )
@inverted = true
else
@inverted = false
end
if ( line =~ /for\s+([^\s]+)\sresolving\s([A-Z]+)\s+as\s'([^']+)'/ )
@resolve_name = $1.dup
@resolve_type = $2.dup
@resolve_expected = $3.dup
end
#
# Ensure we had all the data.
#
raise ArgumentError, "Missing host to resolve" unless( @resolve_name )
raise ArgumentError, "Missing type of record to lookup" unless( @resolve_type )
raise ArgumentError, "Missing expected results" unless( @resolve_expected )
raise ArgumentError, "Uknown record type: #{@resolve_type}" unless( @resolve_type =~ /^(A|NS|MX|AAAA)$/ )
#
# The host to query against
#
@host = line.split( /\s+/)[0]
end
#
# Allow this test to be serialized.
#
def to_s
@line
end
#
# Run the test.
#
def run_test
# Reset the result in case we've already run
@error = nil
#
# Do the lookup
#
results = resolve_via( @host, @resolve_type, @resolve_name, 30 )
return false if ( results.nil? )
#
# OK we have an array of results. If every one of the expected
# results is contained in those results returned then we're good.
#
expected = 0
if ( results != @resolve_expected )
@error = "When resolving the name #{@resolve_name} [#{resolve_type}-record lookup] against DNS-server #{@host} we received an error. The expected result '#{@resolve_expected}' didn't match the returned results '#{results}'"
return false
end
true
end
#
# Resolve an IP
#
def resolve_via( server, ltype, name, period )
results = Array.new()
begin
timeout( period ) do
begin
Resolv::DNS.open(:nameserver=>[server]) do |dns|
case ltype
when /^A$/ then
dns.getresources(name, Resolv::DNS::Resource::IN::A).map{ |r| results.push(r.address.to_s()) }
when /^AAAA$/ then
dns.getresources(name, Resolv::DNS::Resource::IN::AAAA).map{ |r| results.push( r.address.to_s()) }
when /^NS$/ then
dns.getresources(name, Resolv::DNS::Resource::IN::NS).map{ |r| results.push( Resolv.getaddresses(r.name.to_s())) }
when /^MX$/ then
dns.getresources(name, Resolv::DNS::Resource::IN::MX).map{ |r| results.push( Resolv.getaddresses(r.exchange.to_s())) }
else
@error = "Unknown record type to resolve: '#{ltype}'"
return nil
end
end
rescue Exception => x
@error = "Exception was received when resolving : #{x}"
return nil
end
end
rescue Timeout::Error => e
@error = "Timed-out performing DNS lookups #{e}"
return nil
end
#
# Flatten via a hash.
#
h = Hash.new()
results.sort.each do |key|
if ( key.kind_of? Array )
key.each do |n|
h[n]=1
end
else
h[key]=1
end
end
h.keys.sort!.join( "," )
end
#
# If the test fails then report the error.
#
def error
@error
end
register_test_type "dns"
end
end
end
|
