record.rb
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Created: Thu, Feb 20, 1:35 PM

record.rb
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	require 'ipaddr'
	require_dependency 'drop_privileges_validator'

	class Record < ActiveRecord::Base
	belongs_to :domain
	# Powerdns inserts empty records on slave zones,
	# we want to hide them
	#
	# http://mailman.powerdns.com/pipermail/pdns-users/2013-December/010389.html
	default_scope { where.not(type: nil) }

	# List all supported DNS RR types.
	def self.record_types
	[
	'A', 'AAAA', 'CNAME',
	'MX',
	'TXT', 'SPF', 'SRV', 'SSHFP',
	'SOA', 'NS',
	'PTR', 'NAPTR',
	'DS'
	]
	end

	# List types usually used in forward zones.
	def self.forward_records
	record_types - ['SOA', 'PTR']
	end

	# List types usually used in reverse zones.
	def self.reverse_records
	['PTR', 'CNAME', 'TXT', 'NS', 'NAPTR', 'DS']
	end

	# List types usually used in enum zones.
	def self.enum_records
	['NAPTR', 'CNAME', 'TXT', 'NS', 'DS']
	end

	# List types that can be touched by a simple user.
	def self.allowed_record_types
	record_types - WebDNS.settings[:prohibit_records_types]
	end

	validates :name, presence: true
	validates :type, inclusion: { in: record_types }

	# http://mark.lindsey.name/2009/03/never-use-dns-ttl-of-zero-0.html
	validates_numericality_of :ttl,
	allow_nil: true, # Default pdns TTL
	only_integer: true,
	greater_than: 0,
	less_than_or_equal_to: 2_147_483_647

	# Don't allow the following actions on drop privileges mode
	validate :no_touching_for_slave_zones, if: -> { domain.slave? }

	validates_drop_privileges :type,
	message: 'You cannot touch that record!',
	unless: -> { Record.allowed_record_types.include?(type) }
	validates_drop_privileges :name,
	message: 'You cannot touch top level NS records!',
	if: -> { type == 'NS' && domain_record? }

	validates_uniqueness_of :name,
	:scope => [:domain, :type, :content],
	message: "There already exists a record with the same name,
	type and content."

	before_validation :guess_reverse_name
	before_validation :set_name
	after_save :update_zone_serial
	after_destroy :update_zone_serial

	before_create :validate_unique_cname
	before_create :generate_classless_delegations, unless: -> { domain.slave? }
	before_destroy :delete_classless_delegations, unless: -> { domain.slave? }

	# Smart sort a list of records.
	#
	# Order by:
	# * Top level records
	# * Record name
	# * SOA
	# * NS
	# * Friendly type
	# * Priority
	# * Content
	#
	# records - The list of records to order.
	#
	# Returns the list sorted.
	def self.smart_order(records)
	records.sort_by { \|r\|
	[
	r.domain_record? ? 0 : 1, # Zone records
	r.classless_delegated? ? 1 : 0,
	r.name,
	r.type == 'SOA' ? 0 : 1,
	r.type == 'NS' ? 0 : 1,
	record_types.index(r.type), # Friendly type
	r.prio \|\| 0,
	r.content
	]
	}
	end

	def self.search(query)
	wild_search = "%#{query}%" # !index_friendly

	where('name like :q or content like :q', q: wild_search)
	end

	# Get the a short name for the record (without the zone suffix).
	#
	# Returns a string.
	def short
	return '' if name == domain.name
	return '' if name.blank?

	File.basename(name, ".#{domain.name}")
	end

	# Returns true if this is a zone record.
	def domain_record?
	name.blank? \|\| name == domain.name
	end

	# Find out if the record is edittable.
	#
	# by - Editable by :user or :admin.
	#
	# Returns true if the record is editable.
	def editable?(by = :user)
	return false if domain.slave?
	return false if classless_delegated?

	case by
	when :user
	return false unless Record.allowed_record_types.include?(type)
	return false if type == 'NS' && domain_record?
	end

	true
	end

	# Find out this record type supports priorities.
	#
	# We set this to false by default, record types that support priorities.
	# shoule override this.
	#
	# Returns true this record type support priorities.
	def supports_prio?
	false
	end

	# Make sure rails generates record specific urls for all record types.
	#
	# Overrides default rails STI behavior.
	def self.model_name
	return super if self == Record

	Record.model_name
	end

	# Generate the usual admin friendly DNS record line.
	#
	# Returns a string.
	def to_dns
	[name, ttl, 'IN', type, supports_prio? ? prio : nil, content].compact.join(' ')
	end

	# Generate a shorter version of the DNS record line.
	#
	# Returns a string.
	def to_short_dns
	[name, 'IN', type].join(' ')
	end

	def to_api
	Hash[
	:name, name,
	:content, content,
	:type, type,
	:ttl, ttl,
	:prio, prio,
	:disabled, disabled
	].with_indifferent_access
	end

	def classless_delegated?
	return false if not type == 'CNAME'
	return false if not domain.name.end_with?('.in-addr.arpa')

	network, mask = parse_delegation(content)
	return false if network.nil?

	octet = name.split('.').first.to_i
	return true if octet >= network
	return true if octet <= network + 2 ^ (32 - mask) - 1 # max

	false
	end

	def classless_delegation?
	return true if classless_delegation

	false
	end

	def as_bulky_json
	Hash[
	id: id,
	name: name,
	type: type,
	ttl: ttl,
	prio: prio,
	content: content,
	disabled: disabled
	]
	end
	private

	# Validations

	def no_touching_for_slave_zones
	# Allow automatic SOA creation for slave zones
	# powerdns needs a valid serial to compare it with master
	return if type == 'SOA' && validation_context == :create

	errors.add(:type, 'This is a slave zone!')
	end

	# Hooks

	def guess_reverse_name
	return if not type == 'PTR'
	return if not domain.reverse?
	return if name.blank?

	reverse = IPAddr.new(name).reverse
	self.name = reverse if reverse.end_with?(domain.name)
	rescue IPAddr::InvalidAddressError # rubycop:disable HandleExceptions
	end

	# Powerdns expects full domain names
	def set_name
	self.name = domain.name if name.blank?
	self.name = "#{name}.#{domain.name}" if not name.end_with?(domain.name)
	end

	def remove_terminating_dot
	self.content = content.gsub(/\.+\Z/, '')
	end

	def update_zone_serial
	# SOA records handle serial themselves
	return true if type == 'SOA'
	return true if !domain

	domain.soa.bump_serial!
	end

	def classless_delegation
	return if not type == 'NS'
	return if not domain.name.end_with?('.in-addr.arpa')

	network, mask = parse_delegation(name)
	return if network.nil?

	range = IPAddr.new("0.0.0.#{network}/#{mask}").to_range
	return if !range.first.to_s.end_with?(".#{network}")

	range.map { \|ip\|
	octet = ip.to_s.split('.').last
	"#{octet}.#{domain.name}"
	}
	end

	def parse_delegation(value)
	first, _rest = value.split('.', 2)
	first.gsub!('-', '/')
	return if !first['/']

	network, mask = first.split('/', 2).map { \|i\| Integer(i).abs }
	return if [network, mask].join('/') != first
	return if mask <= 24
	return if mask > 31
	return if network > 255

	[network, mask]
	rescue ArgumentError # Not an integer
	end

	def delete_classless_delegations
	rnames = classless_delegation
	return unless rnames

	# Check if we have another NS for the same delegation
	return if domain.records.where(type: 'NS', name: name)
	.where.not(id: id).exists?

	# Delete all CNAMEs
	domain.records.where(name: rnames,
	type: 'CNAME',
	content: name).delete_all
	end

	def generate_classless_delegations
	rnames = classless_delegation
	return unless rnames


	# Make sure no record pre-exist for a delegated domain
	if domain.records.where(name: rnames)
	.where.not("content LIKE ?", "%#{name}").exists?


	errors.add(:name, 'Records already exist for the delegated octets!')
	return false
	end

	rnames.each { \|rname\|
	# This is the FQDN of the delegation e.g. "1.0-26.24.251.195.in-addr.arpa"
	octet = rname.to_s.split('.').first
	delegate_content = "#{octet}.#{name}"

	CNAME.find_or_create_by!(
	type: 'CNAME',
	domain: domain,
	name: rname,
	content: delegate_content,
	)
	}
	end

	def self.to_fqdn(name, domain)
	return name if name.end_with?(domain)

	"#{name}.#{domain}"
	end

	def validate_unique_cname
	return if !domain.records.where(type: 'CNAME', name: name).exists?

	errors.add(:name, 'There exists a CNAME record with the same name')
	return false
	end
	end

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