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Mon, Nov 25, 5:39 PM

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diff --git a/app/models/record.rb b/app/models/record.rb
index b68bc29..bf0aecd 100644
--- a/app/models/record.rb
+++ b/app/models/record.rb
@@ -1,346 +1,348 @@
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
- # 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}"
- # Make sure no record exists for a delegated domain
+ # Make sure no record pre-exist for a delegated domain
if domain.records.where(name: rnames)
- .where.not(content: delegate_content).exists?
+ .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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