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require 'custodian/settings'
require 'custodian/testfactory'
#
# The MX (DNS + smtp) test.
#
# This object is instantiated if the parser sees a line such as:
#
###
### bytemark.co.uk must run mx otherwise 'mail fail'.
###
#
#
module Custodian
module ProtocolTest
class MXTest < TestFactory
#
# Constructor
#
def initialize(line)
# Save the line away
@line = line
# The main domain we're querying
@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 error, in case we were previously executed.
@error = nil
#
# Get the timeout period.
#
settings = Custodian::Settings.instance
period = settings.timeout
#
# The MX-hosts
#
mx = []
#
# Lookup the MX record
#
begin
timeout(period) do
Resolv::DNS.open do |dns|
ress = dns.getresources(@host, Resolv::DNS::Resource::IN::MX)
ress.map { |r| mx.push(IPSocket.getaddress(r.exchange.to_s)) }
end
end
rescue Timeout::Error => e
@error = "Timed-out performing DNS lookups: #{e}"
return Custodian::TestResult::TEST_FAILED
end
#
# At this point we should have an array of IPv4 or IPv6 addresses.
#
# If that array is empty then there will be no incoming mail because
# there are now working MX records in DNS - or because the domain
# has expired, etc.
#
# So on that basis we must alert.
#
if mx.empty? then
@error = "Failed to perform DNS lookup of MX record(s) for host #{@host}"
return Custodian::TestResult::TEST_FAILED
end
#
# For each host we must make a connection.
#
# We'll keep count of failures.
#
failed = 0
passed = 0
error = ''
mx.each do |backend|
begin
timeout(period) do
begin
socket = TCPSocket.new(backend, 25)
read = socket.sysread(1024)
# trim to a sane length & strip newlines.
if !read.nil?
read = read[0, 255]
read.gsub!(/[\n\r]/, '')
end
if read =~ /^220/
passed += 1
else
failed += 1
end
rescue
# Failure to connect.
failed += 1
error += "Error connecting to #{backend}:25. "
end
end
rescue Timeout::Error => _ex
# Timeout
failed += 1
error += "Timeout connecting to #{backend}:25. "
end
end
#
# At this point we should have tested the things
#
if failed > 0
@error = "There are #{mx.size} hosts running as MX-servers for domain #{@host} - #{passed}:OK #{failed}:FAILED - #{error}"
return Custodian::TestResult::TEST_FAILED
else
return Custodian::TestResult::TEST_PASSED
end
end
#
# If the test fails then report the error.
#
def error
@error
end
register_test_type 'mx'
end
end
end
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