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These are requests that diameter itself sends. It's previously been
possible to send them, but answers timed out at the caller since they
were discarded in diameter_watchdog. Answers will still timeout, but now
the requests are discarded before being sent.
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DPR is sent by diameter at application shutdown, service stop, or
transport removal. It has been possible to send the request with
diameter:call/4, but the answer was discarded, instead of the transport
process being terminated. This commit causes DPR to be handled in the
same way regardless of whether it's sent by diameter or by
diameter:call/4.
Note that the behaviour subsequent to DPA is unchanged. In particular,
in the connecting case, the closed connection will be reestablished
after a connect_timer expiry unless the transport is removed. The more
probable use case is the listening case, to disconnect a single peer
associated with a listening transport.
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To make the default DPA timeout configurable. The timeout say how many
milliseconds to wait for DPA in response to an outgoing DPR before
terminating the transport process regardless.
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That currently fails when the resulting DPA is regarded as unsolicited
in diameter_peer_fsm, causing the request to timeout at the caller.
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Since there's a race between an answer being sent and the connection
being closed upon the reception of DPA that's likely to be lost, and
because of the questionability of sending messages after DPR, as
discussed in the parent commit. An exception is made for DPR so that
simultaneous DPR in both directions doesn't result in it being discarded
on both ends.
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RFC 6733 isn't terribly clear about what should happen to incoming or
outgoing messages once DPR is sent and the Peer State Machine
transitions into state Closing. There's no event for this in section
5.6, Peer State Machine, and no clarification in section 5.4,
Disconnecting Peer Connections. There is a little bit of discussion in
2.1.1, SCTP Guidelines, in relation to unordered message delivery, but
the tone there is that messages might be received after DPR because of
unordered delivery, not because they were actually sent after DPR.
Discarding outgoing answers may do more harm than good, but requests are
more likely to be unexpected, as has been seen to be the case with DWR
following DPR. DPR indicates a desire to close the connection: discard
any subsequent outgoing requests.
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* hans/ssh/fix_app_appup:
ssh: Fix syntax error in .appup
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* marcus/revert-ssh-testcase/OTP-12004:
revert ssh testcase
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* dgud/debugger/still-invoked-gs-functions/OTP-12357:
debugger: Do not use the old removed gs functionality
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* hans/ssh/fix_app_appup:
ssh: Fix .app and .appup
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* rickard/appup-files/OTP-12358:
Add .appup file
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* rickard/autoconf/OTP-12348:
Update megaco.appup.src
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dbg_ui_trace module was invoked even though the module had been removed.
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* marcus/revert-ssh-fix/OTP-12004:
Revert "ssh: Corrected ret val from ssh_connection:subsystem/4."
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This reverts commit d086394ebd3595d431835af80709977a6c1c7c89.
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* rickard/check-io-warning-fix/OTP-12352:
Fix function "defined but not used" warning
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* rickard/autoconf/OTP-12348:
Distribute autoconf helpers
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* raimo/netns-opt-gen_udp/OTP-12314:
Text netns option at socket open
Fix handling netns option in gen_udp
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* ia/ssl/appup-fix:
ssl: Correct appup
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Distribute aclocal.m4, install-sh, config.guess, and config.sub
to applications at build time instead of having multiple identical
copies committed in the repository.
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* ia/ssh/prepare-for-release:
ssh: Add soft upgrade for ptty_alloc
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* egil/fix-dialyzer-map-key-coalescing/OTP-12347:
dialyzer: Test recoalesced map keys
compiler: Coalesce map keys in dialyzer mode
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* anders/diameter/17.4_release/OTP-12343:
vsn -> 1.8
Update appup for 17.4
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* siri/ct_netconfc/subsystem-timeout/OTP-12334:
[ct_netconfc] Handle timeout failure in ssh
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* siri/ct_telnet/unstable-tests/OTP-12329:
[ct_telnet] Fix test case 'server_speaks'
[ct_telnet] Improve debug printouts and logging
[ct_telnet] Add timestamp to telnet_server debug printout
[ct_telnet] Extend timeout in test from 1 to 2 sek
[ct_telnet] Don't send extra newline after password
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* hans/ssh/appup:
ssh: Fixes wrong version in appup file
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* lukas/erts/isfinite-fix/OTP-12268:
erts: Fix finite warning for clang
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clang aka llvm claims to be __GNUC__ and thus we have to
explicitly check that it is not used.
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* lukas/erts/bif_info_rebuild/OTP-12344:
Sort keys before generating
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* tuncer/doc-fixes:
dict(3): fix typo reported by Rabbe Fogelholm
Fix minor eprof and fprof doc issues
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* ia/inets/prep-for-release:
inets: Prepare for release
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* ia/ssl/dialyzer/OTP-12341:
ssl: Prepare for release
ssl: Change code to reflect that state data may be secret
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into maint
* raimo/snmp/compiler/allow_refinement_of_opaque/17/OTP-12066:
[snmp/compiler] Refinement of type Opaque was not allowed MIB constructs such as "SYNTAX Opaque (SIZE(0..65535))" was previously not allowed, this has now been fixed. See the standard ALARM-MIB for eaxmple.
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