[erlang-patches] [PATCH] epmd: support IPv6 node registration

Patrik Nyblom <>
Mon May 6 14:28:42 CEST 2013


Hi Fredrik and Michael!
On 05/03/2013 03:44 PM, Fredrik wrote:
> On 05/03/2013 03:27 PM, Michael Santos wrote:
>> On Wed, Feb 20, 2013 at 07:55:17AM -0500, Michael Santos wrote:
>>> Allow IPv6 nodes to register with and query epmd. On systems with
>>> IPv6 support:
>>>
>>> * epmd listens on both the IPv4 and IPv6 ANY or loopback sockets
>>>
>>> * the epmd cli client connects to epmd over the IPv6 loopback
>>>
>>> * distributed nodes started with "-proto_dist inet6_tcp" will register
>>>    with epmd over IPv6
>>>
>>> The interaction between IPv4 and IPv6 sockets depends on the platform:
>>>
>>> * FreeBSD allows multiple "specific" sockets to bind the same port 
>>> (such
>>>    as 2 sockets listening to the same port on ANY and the loopback).
>>>    Binding port 4369 to IPv4 and IPv6 sockets simulataneously is 
>>> allowed.
>>>
>>> * Linux does not allow the same port to be bound by different sockets.
>>>    Setting the IPV6_V6ONLY socket option is required.
>>>
>>> * Windows
>>>
>>>    The behaviour differs depending on the version of Windows:
>>>
>>> http://msdn.microsoft.com/en-us/library/windows/desktop/bb513665(v=vs.85).aspx
>>>
>>>    According to the site, sockets on Windows XP with Service Pack 1 
>>> (SP1)
>>>    and Windows Server 2003 will only listen on either IPv4 or IPv6, so
>>>    creating two sockets is required to service IPv4 and IPv6 traffic on
>>>    the same port. The IPV6_V6ONLY socket option is not supported.
>>>
>>>    For Windows Vista and later, a single socket can handle IPv4 and 
>>> IPv6
>>>    traffic for the same port. The IPV6_V6ONLY socket option is 
>>> supported
>>>    and is enabled for IPv6 sockets by default.
>>> ---
>>>   erts/doc/src/epmd.xml             |    2 +-
>>>   erts/doc/src/erl.xml              |   22 +++++
>>>   erts/epmd/src/epmd.c              |    6 +-
>>>   erts/epmd/src/epmd_cli.c          |   11 ++-
>>>   erts/epmd/src/epmd_int.h          |   63 +++++++++----
>>>   erts/epmd/src/epmd_srv.c          |  184 
>>> +++++++++++++++++++++++++------------
>>>   erts/epmd/test/epmd_SUITE.erl     |   33 ++++++-
>>>   lib/kernel/src/erl_epmd.erl       |   18 ++--
>>>   lib/kernel/src/inet6_tcp_dist.erl |    2 +-
>>>   9 files changed, 248 insertions(+), 93 deletions(-)
>> ping!
>> _______________________________________________
>> erlang-patches mailing list
>> 
>> http://erlang.org/mailman/listinfo/erlang-patches
> I thought that I've already mailed you back regarding this patch. But 
> now I don't seem to remember what I wanted you to do about it.
> I will run it in 'pu' builds over the weekend. If it turns out OK it 
> will be reviewed.
>
Michael wasn't supposed to do anything, we were supposed to raise the 
Windows version when compiling, so that his Windows code worked - at 
least that's what I remember. So I'll prepare a change that will go into 
maint, then you can add the fix to pu. Just give me a day or two for the 
change to reach maint :)

Cheers,
Patrik


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