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Re: Is there a reason why GNUnet forcefully sends a message of type 6?

From: Christian Grothoff
Subject: Re: Is there a reason why GNUnet forcefully sends a message of type 6?
Date: Sat, 23 May 2020 00:00:12 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0

Hi Alessio,

I'm pretty sure that we don't actually ever send the REQUEST_AGPL
messages to services. So if you got one, that suggests that either your
transmission was somehow wrong (i.e. wrong length, maybe
big-endian/little-endian issue?) or you have some memory corruption in
your service. At least I would be very surprised if it was actually
related to "someone" really sending you a REQUEST_AGPL...

Happy hacking!


On 5/22/20 11:52 PM, Alessio Vanni wrote:
> Hello,
> I wrote a small service which is meant to be part of a bigger project.
> While I was checking stdout to see if everything worked correctly, I was
> notified that there was no handle for a message of type 6 and size 4
> (and subsequently that the handle in the service didn't call
> `GNUNET_SERVICE_client_continue' before the timeout.)
> Due to the fact that this specific service is not meant to talk with
> other GNUnet services (it simply uses GNUnet's utilites to talk to
> services that actually use GNUnet and to operate on the received data),
> I enumerated the types of message starting from 0, instead of checking
> which numbers were "free" (i.e. not used by GNUnet itself).  I only have
> 3 message types so far, so receiving a message of type 6 is something
> that can't happen.
> Looking at the source code, it appears that GNUnet forcefully adds a
> handler for this message type upon starting the service in
> `GNUNET_SERVICE_start', but for some reason when starting my service
> this handle was not added, yet the message was sent to the service.
> I can't find where the message is sent in the code, so my research stops
> here, but the question remains: why is GNUnet asking to send an AGPL
> URL, even though the application has nothing to do with the GNUnet core
> itself and might even be licensed differently?
> In particular, this behaviour is not documented at all as far as I know,
> so if by disgrace I had more than 6 message types I would be here trying
> to debug a piece of code that would otherwise have no problems.
> Thanks,
> A.V.

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