Re: [GNUnet-developers] Two questions regarding CADET application

[Christian Grothoff]

On 12/28/2016 04:49 PM, Heiko Stamer wrote:
> Hey developers,
> 
> I am going to use CADET for distributed key generation [1] based 
> algorithms implemented in LibTMCG [2]. I have two short questions:
> 
> 1) Please, can you reserve two official message types and a CADET port
> for this application? Currently I am using:
> 
> #define GNUNET_MESSAGE_TYPE_LIBTMCG_DKG_GENERATE_PIPE_UNICAST   10001
> #define GNUNET_MESSAGE_TYPE_LIBTMCG_DKG_GENERATE_PIPE_BROADCAST 10002
> 
> GNUNET_CRYPTO_hash("42742", 5, &porthash);

We've actually in the latest GNUnet code switched from 32-bit port
numbers to cryptographic hashes as CADET port numbers.  Hence such
#define's are no longer in fashion, so to speak.

Ideally, your application should pick such a hash-port at random or
based on a shared secret of the various participants. In the rare cases
where you do need to hard code one, just use a string describing the
purpose and hash that.

> 2) GNUNET_PROGRAM_run() does not terminates, if services (i.e. ARM) are
> not running. Is this behavior intended? (Workaround: should I use exit
> in shutdown task?)

GNUNET_PROGRAM_run() will only terminate once all activities of your
process have terminated. Usually, the issue behind such non-termination
is that you need to install a shutdown task and use it to explicitly
stop ongoing actions.

I hope this helps!

Happy hacking!

Christian

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