[zeromq-dev] How to get client's identity

[David Jelenc]

Bharat,

unfortunately, I do not have an example at hand. AFAIK, it was fairly 
straightforward. I was using zmqpp bindings:

- you set up a ZAP handler that authenticates clients (CURVE in my case),
- then, whenever a client connects, ZAP handler authenticates it,
- and from then on each message is equipped with additional properties 
describing the client.

See this thread for some more pointers:
 
http://lists.zeromq.org/mailman/private/zeromq-dev/2016-May/030487.html 
(read it bottm-up)

Best,
David

PS Just to be clear -- PUSH and PULL sockets still won't have the 
identity property, but you should be able to identify clients based on 
their credentials.

On 20. 07. 2016 07:39, Bharat Somani wrote:
> Hi,
>
> Can you point to any API/example which will facilitate the addition of
> key-value (meta-data) pairs in the message sent from client?
> I tried to search with respect to ZAP and found that it only facilitates
> the type of authentication to be used. But I am not able to locate any
> API which add/retrieve the key value pairs.
>
>
> Regards,
> Bharat
>
> On Tue, Jul 19, 2016 at 7:17 PM, David Jelenc
> <david.jelenc at fri.uni-lj.si <mailto:david.jelenc at fri.uni-lj.si>> wrote:
>
>     Another option would also be to use ZAP to authenticate clients.
>     Once a client is authenticated, key-value (meta-data) pairs are
>     added to each message so you always know whom each message came from.
>
>     On 19. 07. 2016 15:45, Diego Fons wrote:
>
>         Hi,
>
>         ZMQ_IDENTITY is used only with DEALER socket. You can not
>         retrive client
>         information with PUSH/PULL sockets (they are not implemented for
>         this).
>
>         You can:
>         1) Re-implement your application to use DEALER/ROUTER or
>         2) Implement an abstraction layer that provides client
>         identification
>         (ie. build your own protocol).
>
>         I'd choose the first one, but I don't know the main purpose of the
>         application.
>
>         Regards.
>
>         On Tue, Jul 19, 2016 at 9:31 AM, Bharat Somani
>         <bharatdsomani at gmail.com <mailto:bharatdsomani at gmail.com>
>         <mailto:bharatdsomani at gmail.com
>         <mailto:bharatdsomani at gmail.com>>> wrote:
>
>
>              Hi All,
>
>              I have a process A which is creating ZMQ_PULL type of
>         socket and
>              bind on some port.
>
>              Now I have process B, C, D (all on same system) which all
>         creates
>              ZMQ_PUSH types of sockets in each process respectively and
>         connects
>              to the port on same system on which process A is bind to.
>
>              In process A I am using API zmq_msg_recv() for receiving the
>              messages. Now I want to identify the process (A or B or C) from
>              which that message is received.
>              is there any way to know which process has sent this message?
>
>              I tried to set the ZMQ_IDENTITY in client processes (B,C &
>         D) but
>              dont know how to get the identity from received message on the
>              server process A
>
>              Any pointer in this regard?
>
>
>
>              --
>              With warm regards,
>              Bharat
>
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>         --
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> Bharat Somani
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