[erlang-questions] dtls error when used with chrome webrtc

[Danil Zagoskin]

Hi!
What do you see in Wireshark?
Did you see handshake between two browsers?
Is your application ready to receive the packet sent by browser?
Do you use external STUN server?
Maybe browser sends STUN requests to your port when you expect DTLS hello?

Also try checking chrome://webrtc-internals and chrome://webrtc-logs for
browser's view on what's going on.


On Thu, Dec 28, 2017 at 12:09 AM, Joe K <goodjoe2049@REDACTED> wrote:

> I'm trying to implement parts of webrtc stack with elixir/erlang and
> currently am stuck with setting up a dtls session.
>
> The minimal example is, I think, the following (in console, erlang 20.2.2):
>
>     2> ssl:start().
>     ok
>     3> {ok, ListenSocket} = ssl:listen(8090, [
>     3>   binary,
>     3>   {ip, {0, 0, 0, 0}},
>     3>   {protocol, dtls},
>     3>   {keyfile, <<"priv/server.key">>},
>     3>   {certfile, <<"priv/server.pem">>},
>     3>   {active, false}
>     3> ]).
>     {ok, ...}
>     4> {ok, AcceptSocket} = ssl:transport_accept(ListenSocket).
>     {ok,...}
>     5> ssl:ssl_accept(AcceptSocket).
>     {error,{tls_alert,"record overflow"}}
>
> And js (with chrome canary): https://gist.github.com/idi-ot/
> a07b7330ff02f90373a2dcfe83883afa
>
> After {error,{tls_alert,"record overflow"}} the RTCPeerConnection's
> iceConnectionState becomes "failed" and the connection itself "closed".
>
> I wonder what I am doing wrong.
>
>     openssl s_client -dtls1 -connect 127.0.0.1:8089 -debug
>
> works fine with the code snippet above.
>
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>


-- 
Danil Zagoskin | z@REDACTED
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