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require 'custodian/settings'
require 'custodian/testfactory'
require 'custodian/util/dns'
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
if line =~ /for\s+([^\s]+)\sresolving\s([A-Z]+)\s+as\s'([^']+)'/
@resolve_name = $1.dup
@resolve_type = $2.dup
@resolve_expected = $3.dup.downcase.split(/[\s,]+/)
end
@server_ip = nil
#
# Ensure we had all the data.
#
raise ArgumentError, 'Missing host to resolve' unless @resolve_name
raise ArgumentError, 'Missing type of record to lookup' unless @resolve_type
raise ArgumentError, 'Missing expected results' unless @resolve_expected
raise ArgumentError, "Uknown record type: #{@resolve_type}" unless @resolve_type =~ /^(A|NS|MX|AAAA)$/
#
# 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
#
# Get the timeout period.
#
settings = Custodian::Settings.instance
period = settings.timeout
#
# Do the lookup
#
results = resolve_via(@host, resolve_type, resolve_name, period)
return Custodian::TestResult::TEST_FAILED 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.
#
if !(results - @resolve_expected).empty? or !(@resolve_expected - results).empty?
@error = "DNS server *#{@host}* (#{@server_ip}) returned the wrong records for @#{resolve_name} IN #{resolve_type}@.\n\nWe expected '#{resolve_expected.join(',')}', but we received '#{results.join(',')}'\n"
return Custodian::TestResult::TEST_FAILED
end
#
# We were valid.
#
@error = ''
Custodian::TestResult::TEST_PASSED
end
#
# Resolve an IP
#
def resolve_via(server, ltype, name, period)
results = []
begin
timeout(period) do
begin
#
# Lookup the server IP address first, and record it in an instance variable so we can use it later.
#
@server_ip = Custodian::Util::DNS.hostname_to_ip(server)
if @server_ip.nil?
@error = "Could not resolve DNS server #{server}"
return nil
end
Resolv::DNS.open(:nameserver => [@server_ip]) 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 StandardError => 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, sort, uniq
#
results.flatten.map { |r| r.to_s.downcase }.sort.uniq
end
#
# If the test fails then report the error.
#
def error
@error
end
register_test_type 'dns'
end
end
end
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