Resolv::DNS::Name

Class

A representation of a DNS name.

Class Methods

create(arg)

          
            # File tmp/rubies/ruby-3.1.3/lib/resolv.rb, line 1241
def self.create(arg)
  case arg
  when Name
    return arg
  when String
    return Name.new(Label.split(arg), /\.\z/ =~ arg ? true : false)
  else
    raise ArgumentError.new("cannot interpret as DNS name: #{arg.inspect}")
  end
end

Creates a new DNS name from arg. arg can be:

Name: returns arg.
String: Creates a new Name.

Instance Methods

absolute?

lib/resolv.rb View on GitHub

          
            # File tmp/rubies/ruby-3.1.3/lib/resolv.rb, line 1272
def absolute?
  return @absolute
end

True if this name is absolute.

subdomain_of?(other)

lib/resolv.rb View on GitHub

          
            # File tmp/rubies/ruby-3.1.3/lib/resolv.rb, line 1298
def subdomain_of?(other)
  raise ArgumentError, "not a domain name: #{other.inspect}" unless Name === other
  return false if @absolute != other.absolute?
  other_len = other.length
  return false if @labels.length <= other_len
  return @labels[-other_len, other_len] == other.to_a
end

Returns true if other is a subdomain.

Example:

domain = Resolv::DNS::Name.create("y.z")
p Resolv::DNS::Name.create("w.x.y.z").subdomain_of?(domain) #=> true
p Resolv::DNS::Name.create("x.y.z").subdomain_of?(domain) #=> true
p Resolv::DNS::Name.create("y.z").subdomain_of?(domain) #=> false
p Resolv::DNS::Name.create("z").subdomain_of?(domain) #=> false
p Resolv::DNS::Name.create("x.y.z.").subdomain_of?(domain) #=> false
p Resolv::DNS::Name.create("w.z").subdomain_of?(domain) #=> false

to_s

lib/resolv.rb View on GitHub

          
            # File tmp/rubies/ruby-3.1.3/lib/resolv.rb, line 1333
def to_s
  return @labels.join('.')
end

returns the domain name as a string.

The domain name doesn’t have a trailing dot even if the name object is absolute.

Example:

p Resolv::DNS::Name.create("x.y.z.").to_s #=> "x.y.z"
p Resolv::DNS::Name.create("x.y.z").to_s #=> "x.y.z"