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When making an SSL connection (either as client or as server), the
process implementing the connection may use as much as hundreds of
kilobytes of memory, even when idle. This is problematic for any
application maintaining more than just a few SSL connections.
This patch introduces the option { hibernate_after, int() } to the
ssl:connect and ssl:listen functions, making the SSL connection
process go into hibernation after the specified number of milliseconds
of inactivity. This will reduce the memory used by the process to
just a few hundred bytes, making applications with thousands or
more SSL connections feasible, as long as most of the connections
are idle for most of the time (which is typically the case).
The approach of making the process go into hibernation only after
some time of inactivity was chosen because hibernation incurs some
CPU usage, and it is therefore not desirable for a process to
hibernate after each call.
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ssl's published documentation states:
ssl_accept(ListenSocket) ->
ssl_accept(ListenSocket, Timeout) -> ok | {error, Reason}
(see http://www.erlang.org/doc/man/ssl.html#ssl_accept-1)
while its code has the specs:
-spec ssl_accept(#sslsocket{}) -> {ok, #sslsocket{}} | {error, reason()}.
-spec ssl_accept(#sslsocket{}, list() | timeout()) -> {ok, #sslsocket{}} | {error, reason()}.
One of the two cannot be right. This should be fixed.
Moreover, I do not see why the spec just mentions list() for the options when the documentation explicitly mentions the options of ssl.
Kostis
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Data to sign and verify should be inputed as binaries.
Also cleaned up and moved some dialyzer specs.
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Also fixed incorrect dialyzer spec.
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For testing purposes ssl now also support some anonymous cipher suites
when explicitly configured to do so.
Also moved session cache tests to its own suite, so that timeout
of end_per_testcase when the mnesia is used as session cache will
not affect other test cases.
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Added support for inputing certificates and keys directly in DER format
these options will override the pem-file options if specified.
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Cleaned up and documented the public_key API to
make it useful for general use.
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Started to improve code documentation by using -spec directive, and
some small refactorings to avoid ugly code.
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New ssl now supports secure renegotiation as described by RFC 5746.
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New ssl now properly handles ssl renegotiation, and initiates a
renegotiation if ssl/ltls-sequence numbers comes close to the max value.
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