[zeromq-dev] Can I change a socket mechanism after a connect ?

[Laurent Alebarde]

When I disconnect and reconnect after having changed the mechanism to 
CURVE, the identity is changed. As I need the same identity as of the 
beginning of the handcheck, I cannot wait its setting from the metadata 
information, set by the socket identity option.

So both solutions cannot work.

The three last solutions for me are:

 1. Move to ZMTP 3.1 with big changes to enable CURVE proxying -> I
    won't go that way myself.
 2. Use libcurve instead of ZMTP-CURVE -> Complex with all the updates I
    would have to perform in my application.
 3. Ack the default identity to make it independant of the mechanism ->
    I will try this one.


Le 10/12/2013 11:45, Laurent Alebarde a écrit :
> Thanks Pieter for your reply.
>
> "nor is there any sense in it" : The usual opinion is that when one 
> invent the wheel, he doesn't know 90% of the usefull applications 
> others will do with it. In my use case, it concerns curve proxying. 
> Registering workers under NULL before making the proxy active with 
> CURVE is simplier.
>
> So, may I assume it is alright if I I zmq_disconnect, change the 
> security options of the socket, and re-zmq_connect ?
>
> Other solution from our other discussion, may I assume I can use a 
> specific NULL socket between the worker and the proxy, just for 
> registration, and setting the same identities on both sockets, the 
> NULL one for registration, and the CURVE one that shall be proxified ?
>
>
> Le 10/12/2013 10:15, Pieter Hintjens a écrit :
>> The security mechanism, like some other socket options, applies to the
>> next connection (in or outgoing). A single TCP connection cannot
>> switch between mechanisms. There's no protocol for that, nor is there
>> any sense in it. Changing security level on a socket after having
>> connections is also dangerous and we've discussed banning it.
>>
>>
>> On Mon, Dec 9, 2013 at 3:24 PM, Laurent Alebarde<l.alebarde at free.fr>  wrote:
>>> Hi Devs,
>>>
>>> Is it possible to start a socket as NULL, send some messages, then change
>>> the socket to CURVE ?
>>> Does the identity of the socket change in the process ?
>>>
>>> Cheers,
>>>
>>>
>>> Laurent
>>>
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>
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