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# frozen_string_literal: true
#
# Author:: Serdar Sutay (<serdar@chef.io>)
# Copyright:: Copyright (c) Chef Software Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require "socket" unless defined?(Socket)
module Ohai
module Mixin
module NetworkHelper
FAMILIES = {
"inet" => "default",
"inet6" => "default_inet6",
}.freeze
def hex_to_dec_netmask(netmask)
# example 'ffff0000' -> '255.255.0.0'
dec = netmask[0..1].to_i(16).to_s(10)
[2, 4, 6].each { |n| dec = dec + "." + netmask[n..n + 1].to_i(16).to_s(10) }
dec
end
# This does a forward and reverse lookup on the hostname to return what should be
# the FQDN for the host determined by name lookup (generally DNS). If the forward
# lookup fails this will throw. If the reverse lookup fails this will return the
# hostname back. The behavior on failure of the reverse lookup is both vitally important
# to this API, and completely untested, so changes to this method (not recommended) need
# to be manually validated by hand by setting up a DNS server with a broken A record to
# an IP without a PTR record (e.g. any RFC1918 space not served by the configured DNS
# server), and the method should return the hostname and not the IP address.
#
def canonicalize_hostname(hostname)
Addrinfo.getaddrinfo(hostname, nil, nil, nil, nil, Socket::AI_CANONNAME).first.canonname
end
def canonicalize_hostname_with_retries(hostname)
retries = 3
begin
canonicalize_hostname(hostname)
rescue
retries -= 1
retry if retries > 0
nil
end
end
end
end
end
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