Method: Rinda::RingServer#make_socket

Defined in:
lib/rinda/ring.rb

#make_socket(address, interface_address = nil, multicast_interface = 0) ⇒ Object

Creates a socket at address

If address is multicast address then interface_address and multicast_interface can be set as optional.

A created socket is bound to interface_address. If you use IPv4 multicast then the interface of interface_address is used as the inbound interface. If interface_address is omitted or nil then ‘0.0.0.0’ or ‘::1’ is used.

If you use IPv6 multicast then multicast_interface is used as the inbound interface. multicast_interface is a network interface index. If multicast_interface is omitted then 0 (default interface) is used.



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# File 'lib/rinda/ring.rb', line 132

def make_socket(address, interface_address=nil, multicast_interface=0)
  addrinfo = Addrinfo.udp(address, @port)

  socket = Socket.new(addrinfo.pfamily, addrinfo.socktype,
                      addrinfo.protocol)

  if addrinfo.ipv4_multicast? or addrinfo.ipv6_multicast? then
    if Socket.const_defined?(:SO_REUSEPORT) then
      socket.setsockopt(:SOCKET, :SO_REUSEPORT, true)
    else
      socket.setsockopt(:SOCKET, :SO_REUSEADDR, true)
    end

    if addrinfo.ipv4_multicast? then
      interface_address = '0.0.0.0' if interface_address.nil?
      socket.bind(Addrinfo.udp(interface_address, @port))

      mreq = IPAddr.new(addrinfo.ip_address).hton +
        IPAddr.new(interface_address).hton

      socket.setsockopt(:IPPROTO_IP, :IP_ADD_MEMBERSHIP, mreq)
    else
      interface_address = '::1' if interface_address.nil?
      socket.bind(Addrinfo.udp(interface_address, @port))

      mreq = IPAddr.new(addrinfo.ip_address).hton +
        [multicast_interface].pack('I')

      socket.setsockopt(:IPPROTO_IPV6, :IPV6_JOIN_GROUP, mreq)
    end
  else
    socket.bind(addrinfo)
  end

  socket
rescue
  socket = socket.close if socket
  raise
ensure
  @sockets << socket if socket
end