86 lines
2.1 KiB
Plaintext
86 lines
2.1 KiB
Plaintext
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#!/usr/bin/env ruby
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require 'json'
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require 'erb'
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require 'netaddr'
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require 'fileutils'
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require 'pathname'
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LXC_ROOT = Pathname.new("/etc/lxc")
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ZONE_PATH = LXC_ROOT.join("zones")
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TEMPLATE_PATH = LXC_ROOT.join("templates")
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CONTAINER_DATA = LXC_ROOT.join("container.json")
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LXC_ZONE = ZONE_PATH.join("lxc.zone")
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DNS_CONTAINER = "dns"
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def atomic_write(path, content)
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temp_path = path.to_s + ".tmp"
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File.open(temp_path, 'w+') do |f|
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f.write(content)
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end
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FileUtils.mv(temp_path, path)
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end
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class ZoneData
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def initialize(data)
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@data = data
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end
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attr_reader :data
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def get_binding
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binding
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end
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def ip(subnet)
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NetAddr::CIDR.create(subnet).ip(Short: true)
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end
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end
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class RdnsData
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def initialize(data, subnet)
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@data = data
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@subnet = subnet
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end
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attr_reader :data, :subnet
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def get_binding
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binding
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end
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def pointers(&block)
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subnet_arpa = @subnet.arpa
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version = @subnet.version
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data["network"].each do |name, data|
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next unless data["ipv#{version}"]
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arpa = NetAddr::CIDR.create(data["ipv#{version}"]).arpa
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addr = arpa[0, arpa.size - subnet_arpa.size - 1]
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yield addr, name
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end
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end
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end
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json = JSON.load(File.open(CONTAINER_DATA))
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json["zone"]["serial"] += 1
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rdns_zone_template = File.read(TEMPLATE_PATH.join("rdns-zone.erb"))
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zone_data = ZoneData.new(json)
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lxc_zone_template = File.read(TEMPLATE_PATH.join("lxc-zone.erb"))
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zone = ERB.new(lxc_zone_template, nil, '-').result(zone_data.get_binding)
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v4_subnet = NetAddr::CIDR.create(json["zone"]["v4_subnet"])
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v4_rdns_path = ZONE_PATH.join(v4_subnet.arpa.gsub(/\.$/, ""))
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v4_rdns_zone = ERB.new(rdns_zone_template, nil, '-').result(RdnsData.new(json, v4_subnet).get_binding)
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v6_subnet = NetAddr::CIDR.create(json["zone"]["v6_subnet"])
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v6_rdns_path = ZONE_PATH.join(v6_subnet.arpa.gsub(/\.$/, ""))
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v6_rdns_zone = ERB.new(rdns_zone_template, nil, '-').result(RdnsData.new(json, v6_subnet).get_binding)
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atomic_write(LXC_ZONE, zone)
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atomic_write(v4_rdns_path, v4_rdns_zone)
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atomic_write(v6_rdns_path, v6_rdns_zone)
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atomic_write(CONTAINER_DATA, JSON.pretty_generate(json))
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system("lxc-attach", "-n", DNS_CONTAINER, "--", "rndc", "reload")
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