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require 'resolv'
#
# The DNSBL test.
#
# This object is instantiated if the parser sees a line such as:
#
###
### 1.2.3.4 must not run dnsbl via zen.spamhaus.org otherwise 'The IP is blacklisted in spamhaus'.
###
#
#
module Custodian
module ProtocolTest
class DNSBLTest < TestFactory
#
# Save away state from the configuration line.
#
def initialize(line)
@line = line
@host = line.split(/\s+/)[0]
#
# Ensure the host is an IP address.
#
raise ArgumentError, 'The target must be an IP address' unless @host =~ /^([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)$/
#
# See which blacklist(s) we're testing against.
#
if line =~ /via\s+([^\s]+)\s+/
@zones = $1.dup
else
@zones = 'zen.spamhaus.org'
end
#
# Is this test inverted?
#
if line =~ /must\s+not\s+run\s+/
@inverted = true
else
@inverted = false
end
end
#
# Allow this test to be serialized.
#
def to_s
@line
end
#
# Run the test.
#
# Return "true" on success - if the IP is listed. False if not.
#
def run_test
# The error is empty.
@error = nil
@zones.split(',').each do |zone|
#
# Convert the IP to be looked up.
#
# Given IP 1.2.3.4 we lookup the address of the name
# 4.3.2.1.$zone
#
if @host =~ /^([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)$/
name = "#{$4}.#{$3}.#{$2}.#{$1}.#{zone}"
result = Custodian::Util::DNS.hostname_to_ip(name)
if (!result.nil?) && (result.length > 0)
@error = "IP #{@host} listed in blacklist #{zone}. Lookup of #{name} lead to result: #{result}"
return true
end
else
@error = "#{@host} wasn't an IP address"
return true
end
end
false
end
#
# If the test failed here we will return a suitable error message.
#
def error
@error
end
# register ourselves with the class-factory
register_test_type 'dnsbl'
end
end
end
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