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Separate sending and receiving when using TCP as transport
as prim_inet:send may block which in turn may result
in a deadlock between two Erlang processes communicating over
TLS, this is especially likely to happen when running Erlang distribution
over TLS.
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We want to prepare the code for more advanced DTLS usage and possibility
to run over SCTP. First assumption was that the demultiplexer process
"dtls listener" was needed for UDP only and SCTP could be made more TLS
like. However the assumption seems not to hold. This commit prepares
for customization possibilities.
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Test that DTLS handles "high" level packet types as http-packet types.
Low level packet type as {packet, 2} we will consider later if they
should be relevant to support or not.
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DTLS does not support stream ciphers and needs diffrent
handling of the "#ssl_socket{}" handle .
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Beta DTLS, not production ready. Only very basically tested, and
not everything in the SPEC is implemented and some things
are hard coded that should not be, so this implementation can not be consider
secure.
Refactor "TLS connection state" and socket handling, to facilitate
DTLS implementation.
Create dtls "listner" (multiplexor) process that spawns
DTLS connection process handlers.
Handle DTLS fragmentation.
Framework for handling retransmissions.
Replay Detection is not implemented yet.
Alerts currently always handled as in TLS.
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