Sha256: c74ee31e3a0063242d0c3c71c32b9aee8349b3a825d664d0faf705c593ba82e4
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Versions: 11
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Stored size: 1.84 KB
Contents
# for validating DNS -> IP setups
require 'net/dns'
module Bosh::Cloudfoundry::Validations
# Validates that +domain+ is an A record that resolves to +expected_ip_addresses+
# and no other IP addresses.
#
# Usage:
#
# dns_mapping = Bosh::Cloudfoundry::Validations::DnsIpMappingValidation.new("foobar.mycloud.com", "1.2.3.4")
# if dns_mapping.valid?
# puts "`#{dns_mapping.domain}' maps to #{dns_mapping.ip_address}"
# else
# puts "Validation errors:"
# dns_mapping.errors.each do |error|
# puts "- %s" % [error]
# end
# puts "`#{dns_mapping.domain}' does not map to #{dns_mapping.ip_address}"
# end
class DnsIpMappingValidation
include Bosh::Cli::Validation
include BoshExtensions
attr_reader :domain
attr_reader :ip_address
def initialize(domain, ip_address)
@domain = domain
@ip_address = ip_address
end
def perform_validation(options={})
resolved_a_records = nil
step("Resolve DNS",
"Cannot resolve DNS '#{domain}' to an IP address", :fatal) do
any_resolved_records, resolved_a_records = resolve_dns(domain)
any_resolved_records
end
step("Resolve DNS '#{domain}' to IP '#{ip_address}'",
"DNS '#{domain}' resolves to: #{resolved_a_records.join(', ')}") do
resolved_a_records == [ip_address]
end
end
protected
def resolve_dns(domain)
domain += "." if domain[-1] != "."
packet = Net::DNS::Resolver.start(domain, Net::DNS::A)
resolved_a_records = packet.answer.select { |record|
record.name == domain
}.map { |record|
case record.type
when "CNAME"
resolve_dns(record.value)[1]
when "A"
record.value
end
}.flatten
[(resolved_a_records.size > 0), resolved_a_records]
end
end
end
Version data entries
11 entries across 11 versions & 1 rubygems