UDPSocket#bind(ip, port) fails under IPv6!

ruby-talk
1

Hi, the following script shows that UDPSocket#bind fails if the given
IP is IPv6 (however TCPServer does not fail). It occurs with Ruby 1.8
and 1.9.X.

My computer has IPv4 and IPv6 (using Miredo/Teredo).

The script:

···

-------------------------------------------------------------
#!/usr/bin/ruby

require "socket"

IPv4 = "192.168.1.12"
IPv6 = "2001:0:53aa:64c:187c:3ecb:3419:d1a6"
PORT = 9999

begin
  puts "1) binding in IPv4 TCP..."
  s4 = TCPServer.open IPv4, PORT
  puts "=> OK"
rescue => e
  $stderr.puts "#{e.class}: #{e}"
end

begin
  puts "2) binding in IPv6 TCP..."
  s4 = TCPServer.open IPv6, PORT
  puts "=> OK"
rescue => e
  $stderr.puts "#{e.class}: #{e}"
end

begin
  puts "3) binding in IPv4 UDP..."
  s4 = UDPSocket.new
  s4.bind IPv4, PORT
  puts "=> OK"
rescue => e
  $stderr.puts "#{e.class}: #{e}"
end

begin
  puts "4) binding in IPv6 UDP..."
  s4 = UDPSocket.new
  s4.bind IPv6, PORT
  puts "=> OK"
rescue => e
  $stderr.puts "#{e.class}: #{e}"
end
-------------------------------------------------------------

Result of the script:

----------------------
1) binding in IPv4 TCP...
=> OK

2) binding in IPv6 TCP...
=> OK

3) binding in IPv4 UDP...
=> OK

4) binding in IPv6 UDP...
Errno::EAFNOSUPPORT: Address family not supported by protocol - bind(2)
----------------------

Is it a known issue? If not I will report it.

--
Iñaki Baz Castillo
<ibc@aliax.net>

2

You need to create an AF_INET6 UDPSocket to bind an IPv6 address

  $ ruby -vr 'socket' -e 'u = UDPSocket.new Socket::AF_INET6; u.bind "::1", 9999'
  ruby 1.8.7 (2010-01-10 patchlevel 249) [universal-darwin11.0]

Repeated from Bug #5525: UDPSocket#bind(ip, port) fails under IPv6 => Errno::EAFNOSUPPORT - Ruby master - Ruby Issue Tracking System

···

On Oct 31, 2011, at 7:16 AM, Iñaki Baz Castillo wrote:

s4 = UDPSocket.new
s4.bind IPv6, PORT
puts "=> OK"
rescue => e
$stderr.puts "#{e.class}: #{e}"
end

4) binding in IPv6 UDP...
Errno::EAFNOSUPPORT: Address family not supported by protocol - bind(2)
----------------------

Is it a known issue? If not I will report it.

3

Thanks a lot. It works. Anyhow I've commented in the bug report. IMHO
it should work out-of-the-box as in the case of TCPServer.

···

2011/10/31 Eric Hodel <drbrain@segment7.net>:

You need to create an AF_INET6 UDPSocket to bind an IPv6 address

$ ruby -vr 'socket' -e 'u = UDPSocket.new Socket::AF_INET6; u.bind "::1", 9999'
ruby 1.8.7 (2010-01-10 patchlevel 249) [universal-darwin11.0]

Repeated from Bug #5525: UDPSocket#bind(ip, port) fails under IPv6 => Errno::EAFNOSUPPORT - Ruby master - Ruby Issue Tracking System

--
Iñaki Baz Castillo
<ibc@aliax.net>