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As discussed in the parent commit. This is easier said than done in
practice, but there's no harm in allowing it.
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This can be used as a simple form of overload protection, discarding the
message before it's passed into diameter to become one more request
process in a flood. Replying with 3004 would be more appropriate when
the request has been directed at a specific server (the RFC's
requirement) however, and possibly it should be possible for a callback
to do this as well.
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In addition to returning ok or {timeout, Tmo}, let a throttling callback
for message reception return a pid(), which is then notified if the
message in question is either discarded or results in a request process.
Notification is by way of messages of the form
{diameter, discard | {request, pid()}}
where the pid is that of a request process resulting from the received
message. This allows the notification process to keep track of the
maximum number of request processes a peer connection can have given
rise to.
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The callback is now applied to the atom 'false' when asking if another
message should be received on the socket, and to a received binary
message after reception. Throttling on received messages makes it
possible to distinguish between requests and answers.
There is no callback on outgoing messages since these don't have to go
through the transport process, even if they currently do.
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To let a callback module decide whether or to receive another message
from the peer, so that backpressure can be applied when it's
inappropriate. This is to let a callback protect against reading more
than can be processed, which is otherwise possible since diameter_tcp
otherwise always asks for more.
A callback is made after each message, and can answer to continue
reading or to ask again after a timeout. It's each message instead of
each packet partly for simplicity, but also since this should be
sufficiently fine-grained. Per packet would require some interaction
with the fragment timer that flushes partial messages that haven't been
completely received.
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In particular, that starts for the same transport reference can now be
concurrent. Looking up a listener process and starting a new one if not
found did handle this (more than one process could find no listener),
and diameter_sctp assumed there could only be one transport process
waiting for an association.
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Option 'accept' allows remote addresses to be configured as tuples or
regular expressions. The remote addresses for any incoming (aka
accepted) connection/association are matched against the configured
values, any non-matching address causing the connection/association to
be aborted.
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The third argument to start/3 was just wrong.
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Use the default address address (as selected by gen_tcp) if none is
configured, passing it in the new 'connected' message introduced by the
previous commit.
The corresponding update to diameter_sctp has to wait until problems
with inet:sockname/1 are resolved: the function currently only returns
one address, and sometimes {0,0,0,0}. See OTP-11018.
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Don't start a new timer with each incoming message. Instead, start a
timer at timeout and flush after two successive timeouts with no message
reception.
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Which will be the case in R16B.
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Which will be the case with R16B in this case.
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* anders/diameter/R15B02_release:
Dialyzer spec fix
Learn to keep time in diameter_gen_sctp_SUITE
Update command line test for changed ct:run_test/1 return value
OTP-10243
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To be used by diameter_service in constructing service_info.
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This is the method added in draft-ietf-dime-rfc3588bis, whereby
a TLS handshake immediately follows connection establishment and
CER/CEA is sent over the secured connection.
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If TLS has been configured on Inband-Security-Id then the transport
process receives a message from the peer_fsm process indicating
whether or not to upgrade to TLS.
The current draft of RFC 3588 deprecates (but retains for backwards
compatibility) the use of Inband-Security-Id for negotiating TLS,
adding the possibility of TLS having be negotiated before capabilities
exchange. This commit handles the deprecated case.
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When an initial message is received and TLS is a possibility, must
wait for a message from the peer process before either commencing
a handshake or receiving more messages.
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The application provides an implementation of the Diameter protocol
as defined in RFC 3588.
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