[openjdk-x] Bind to a multicast address fails

[Chris Hegarty]

On 10/09/18 15:09, Alan Bateman wrote:
> On 10/09/2018 14:53, Chris Hegarty wrote:
>>
>> On 10/09/18 10:22, vyom tewari wrote:
>>> ...
>>> Hi Andre,
>>>
>>> i will apply your patch run our all network tests. I will update once 
>>> i will have result.
>>
>> The patch in question is in the description of 
>> https://bugs.openjdk.java.net/browse/JDK-8210493, correct?
>> I'm posting it in this thread for reference [*].
>>
>> The proposed change is in the NET_InetAddressToSockaddr
>> function, which is used in many places. I wonder is this
>> change should rather be confined to PlainDatagramSocketImpl
>> bind ( since this is the only reported issue arising from
>> limiting the addition of the scope to link-local ) ?
>>
> If there is a DatagramSocket or DatagramChannel bound to a multicast 

Ok, we absolutely need the DatagramChannel implementation too.

> address then it has be possible to connect to that address too.

Hmmm... I get bind, but am less sure about `connect`. We will
need to test.

> So we 
> may need it for the connect methods - that should become obvious once 
> some sets up an environment and starts to extend the existing tests to 
> bind to IPv6 multicast addresses.

Maybe the native implementation of these methods can be
updated to accept a scope, rather than poking around in
the InetSocketAddress from JNI code.

-Chris.