cmol

require "socket"

CONNECT_ADDR = "localhost"
CONNECT_PORT = 12345
MSG_LENGTH  = 256
FLAGS       = 0

Addrinfo.udp(CONNECT_ADDR, CONNECT_PORT).connect do |socket|
  socket.send("Connected via unspecified address family socket", FLAGS)
  message, server = socket.recvfrom(MSG_LENGTH)

cmol

cmol@qui-gon:~$ ruby echo_client_udp.rb
[IPv6] Connected via unspecified address family socket
[IPv6] Connected via AF_INET6
[IPv4] Connected via AF_INET

cmol

Socket.getaddrinfo(CONNECT_ADDR,CONNECT_PORT, :AF_UNSPEC, :DGRAM).each do | con |
  af, port, hostname, ip, pf, sock_type, ipproto = con
  Addrinfo.udp(ip, port).connect do |socket|
    socket.send("Connected via #{af}", FLAGS)
    message, server = socket.recvfrom(MSG_LENGTH)
    puts message
  end
end

cmol

irb(main):003:0> Socket.getaddrinfo("localhost", 12345, :AF_UNSPEC, :DGRAM)
=> [
     ["AF_INET6", 12345,       "::1",       "::1", 10, 2, 17],
     ["AF_INET",  12345, "127.0.0.1", "127.0.0.1",  2, 2, 17]
   ]

cmol

addr_info = Addrinfo.new(client)
puts "Client connected from #{addr_info.ip_address} using " +
  "#{addr_info.ipv6_v4mapped? ? "IPv4" : "IPv6"}"

cmol

require "socket"

LISTEN_ADDR = "::"
LISTEN_PORT = 12345
MSG_LENGTH  = 256
FLAGS       = 0

# Create socket and bind it to the listen on all addresses and the given port
server_socket = UDPSocket.new :INET6
server_socket.bind(LISTEN_ADDR, LISTEN_PORT)

cmol

cmol@qui-gon:~$ ruby src/chat_server_udp.rb
Client connected from ::ffff:127.0.0.1 using IPv4
Client connected from ::1 using IPv6

cmol

cmol@qui-gon:~$ nc -4 -u localhost 12345
Hello from IPv4!
[IPv4] Hello from IPv4!

cmol@qui-gon:~$ nc -6 -u localhost 12345
Hello from IPv6!
[IPv6] Hello from IPv6!

cmol

cmol@qui-gon:~$ ruby echo_client_udp.rb
[IPv6] Connected via unspecified address family socket

cmol

require "socket"

LISTEN_ADDR = "::"
LISTEN_PORT = 12345
MSG_LENGTH  = 256
FLAGS       = 0

# Create socket and bind it to the listen on all addresses and the given port
server_socket = UDPSocket.new :INET6
server_socket.bind(LISTEN_ADDR, LISTEN_PORT)