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|
#!/usr/bin/ruby1.8
require 'resolv-replace'
#
# This is a protocol tester for DNS.
#
class DNSTest
#
# Data passed from the JSON hash.
#
attr_reader :test_data
#
# The error text we return on failure.
#
attr_reader :error
#
# Save the data away.
#
def initialize( data )
@test_data = data
@error = nil
#
# Ensure we have a host to monitor
#
if ( @test_data["target_host"].nil? )
@error = "Missing host to test against."
raise ArgumentError, @error
end
#
# Ensure we have test-specific keys.
#
if ( @test_data["resolve_name"].nil? )
@error = "Missing host to resolve."
raise ArgumentError, @error
end
if ( @test_data["resolve_type"].nil? )
@error = "Missing type to resolve, for example A/MX/NS."
raise ArgumentError, @error
end
if ( @test_data["resolve_expected"].nil? )
@error = "Missing expected results to compare against.."
raise ArgumentError, @error
end
end
#
# Run the test.
#
# Return "true" on success
#
# Return "false" on failure.
#
# If the test fails the details should be retrieved from "error()".
#
def run_test
#
# Reset state from previous test.
#
@error = nil
#
# Get the nameserver to resolve with
#
nameserver = @test_data["target_host"]
#
# Get the record type to lookup
#
record = @test_data["resolve_type"]
#
# Get the hostname to lookup
#
lookup = @test_data["resolve_name"]
#
# Get the expected results
#
expected = @test_data["resolve_expected"]
#
# Do the lookup abort if that fails.
#
timeout = @test_data["timeout"].to_i
results = resolve_via( nameserver, record, lookup, timeout )
return false if ( results.nil? )
#
# Show the results if we found something.
#
if ( @test_data['verbose'] )
results.each do |res|
puts "Result: #{res}"
end
end
#
# 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.split( /;/ ).each do |required|
if ( ! results.include?( required ) )
@error = "The expected result #{required} was not found in the results: #{results.join(",")}"
return false
end
end
return true
end
#
# Resolve an IP
#
def resolve_via( server, ltype, name, period )
puts "Resolving #{name} [#{ltype}] via server #{server}"
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()) }
end
end
rescue Exception => x
@error = "Exception was received when resolving : #{x}"
return nil
end
end
rescue Timeout::Error => e
@error = "Timed-out connecting #{e}"
return nil
end
results.flatten!
return results
end
#
# Return the error text for why this test failed.
#
def error
return @error
end
end
#
# Sample test, for testing.
#
if __FILE__ == $0 then
#
# Sample data.
#
test = {
"target_host" => "a.ns.bytemark.co.uk",
"test_type" => "dns",
"verbose" => 1,
"timeout" => "4",
"test_alert" => "DNS failure",
"resolve_name" => "support.bytemark.co.uk",
"resolve_type" => "MX",
"resolve_expected" => "89.16.184.148;89.16.184.149;89.16.184.150"
}
#
# Run the test.
#
obj = DNSTest.new( test )
if ( obj.run_test )
puts "TEST OK"
else
puts "TEST FAILED"
puts obj.error()
end
end
|
