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Resolv::MDNS is a one-shot Multicast DNS (mDNS) resolver. It blindly makes queries to the mDNS addresses without understanding anything about multicast ports.

Information taken form the following places:

  • RFC 6762

Methods
E
N

Constants

AddressV4 = '224.0.0.251'
 

Default IPv4 mDNS address
AddressV6 = 'ff02::fb'
 

Default IPv6 mDNS address
Addresses = [ [AddressV4, Port], [AddressV6, Port], ]
 

Default mDNS addresses
Port = 5353
 

Default mDNS Port

Class Public methods

new(config_info=nil)

Creates a new one-shot Multicast DNS (mDNS) resolver.

config_info can be:

nil

Uses the default mDNS addresses

Hash

Must contain :nameserver or :nameserver_port like Resolv::DNS#initialize.

Source: show | on GitHub 

# File ruby/lib/resolv.rb, line 3118
def initialize(config_info=nil)
  if config_info then
    super({ nameserver_port: Addresses }.merge(config_info))
  else
    super(nameserver_port: Addresses)
  end
end

Instance Public methods

each_address(name)

Iterates over all IP addresses for name retrieved from the mDNS resolver, provided name ends with “local”. If the name does not end in “local” no records will be returned.

name can be a Resolv::DNS::Name or a String. Retrieved addresses will be a Resolv::IPv4 or Resolv::IPv6

Source: show | on GitHub 

# File ruby/lib/resolv.rb, line 3134
def each_address(name)
  name = Resolv::DNS::Name.create(name)

  return unless name[-1].to_s == 'local'

  super(name)
end