[erlang-questions] DTLS server example?

[Ingela Andin]

Hi thank you for testing,  we will look into this problem. I am afraid that
the solution will not be able to make it for 20.0 as last bugfix merges
 will be today. But as soon as we have a tested solution it will be merged
to the new maint and part of there after upcoming release.


Regards Ingela  Erlang/OTP team - Ericsson AB

2017-06-14 6:24 GMT+02:00 Vans S <vans_163@REDACTED>:

> Increasing buffer sizes rec|snd|buffer on both client and serer to
> 1024*1024 seems to solve this BUT sending large binaries like 75*1024 makes
> the other party not receive the send with no erors.
>
>
> On Tuesday, June 13, 2017 11:36 PM, Vans S <vans_163@REDACTED> wrote:
>
>
> I was on OTP 20 rc2, master fixes that issue.  Another issue I found is
> this.
>
> I have a send_after procing every 100 ms sending binary:copy(<<"a">>,
> N*1024) bytes. Client to server.
>
> If N is 1-7 the server receives the bytes, as soon as N becomes 8 or
> higher, even N=8*1024-32, the server gets an error:
>
> SSL: {connection, {alert,2,20,{"dtls_record.erl,538},undefined}:
> ssl_connection.erl:845: Fatal error: unexpected message
>
> ** Reason for termination ==
> ** {{key_exists,{{10,66,50,37},58874}},
>     [{gb_trees,insert_1,4,[{file,"gb_trees.erl"},{line,319}]},
>      {gb_trees,insert,3,[{file,"gb_trees.erl"},{line,278}]},
>      {dtls_udp_listener,setup_new_connection,5,
>                         [{file,"dtls_udp_listener.erl"},{line,238}]},
>      {dtls_udp_listener,handle_info,2,
>                         [{file,"dtls_udp_listener.erl"},{line,138}]},
>      {gen_server,try_dispatch,4,[{file,"gen_server.erl"},{line,616}]},
>      {gen_server,handle_msg,6,[{file,"gen_server.erl"},{line,686}]},
>      {proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,247}]}]}
>
>
> On Tuesday, June 13, 2017 4:22 PM, Ingela Andin <ingela.andin@REDACTED>
> wrote:
>
>
> Hi!
>
> This particular problem described below is fixed on latest master.  And
> there are some mor fixes in testing that probably will make OTP 20.
>  DTLS support will however be experimental in 20 as we have not had time
> to battle tested it as much as we want to to be able to ensure the same
> quality as for TLS.
>
> Regards Ingela Erlang/OTP team - Ericsson AB
>
>
> Slight problem now.
>
> Testing on localhost everything works fine.  Now I am testing on a remote
> server with large latency and I keep getting this error on the client,
> SSL: {connection, flight_retransmission_timeout} Fatal error: unexpected
> message.
>
> I tested using pydtls as the client and this error does not happen.
>
> Also the server shows a "unexpected message" tls_alert. Does not happen
> with pydtls as the client.
>
>
> On Tuesday, June 13, 2017 3:51 AM, Vans S <vans_163@REDACTED> wrote:
>
>
> Thank you for the encouragement, I got it working, the key was to call
> transport_accept then ssl_accept, I was calling one or the other.
>
>
> On Monday, June 12, 2017 8:34 AM, Ingela Andin <ingela@REDACTED> wrote:
>
>
> Hi!
>
> Only difference to TLS is that you need to provide the option {protocol,
> dtls}.
>
> Regards Ingela
> 2017-06-12 9:45 GMT+02:00 Andreas Schultz <aschultz@REDACTED>:
>
> Hi Vans,
>
> I haven't played with it yet, but with the DTLS stack in R20 creating a
> DTLS server should be mostly identical to a TLS server.
>
> For an example on how this works with my old, patched version, you could
> check out the CAPWAP [1] project.
>
> Regards
> Andreas
>
> [1]: https://github.com/ travelping/capwap
> <https://github.com/travelping/capwap>
>
> ----- On Jun 12, 2017, at 9:34 AM, Vans S <vans_163@REDACTED> wrote:
>
> I am trying to implement a DTLS server but having trouble.
>
> The DTLS client works great, used RoadRunners patches and example.
>
> For the server side I had success to what I think was accepting a peer
> using the undocumented 'dtls' module directly, but I cannot send to the
> socket.
>
> Does anyone have a clue how to create a DTLS server in erlang?
>
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