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Allow even unknown messages, by registration, and allow sending them #6689

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rustyrussell
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Closes: #4963 (ancient)
Closes: #4960

@rustyrussell rustyrussell added this to the v23.11 milestone Sep 18, 2023
@rustyrussell rustyrussell changed the title Guilt/allow even messages Allow even unknown messages, by registration, and allow sending them Sep 18, 2023
@endothermicdev
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Looks good technically, though it needs a rebase. I know "It's your funeral," but maybe we should log a single message the first time the node sends a custom even message. That way there's at least a hint for the operator to grep for?

types, since that may cause issues with the internal state tracking of
Core Lightning.
Core Lightning. We do (as of *v23.11*) allow sending of even types, but note that peers (as per the spec) will disconnect on receiving unknown even types.
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inconsistent line breaks

@rustyrussell
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Looks good technically, though it needs a rebase. I know "It's your funeral," but maybe we should log a single message the first time the node sends a custom even message. That way there's at least a hint for the operator to grep for?

Good advice! Made the first one INFO, the DEBUG level after that.

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Rebased, and added log message.

@rustyrussell rustyrussell force-pushed the guilt/allow-even-messages branch 2 times, most recently from 37f6d15 to 4d57992 Compare October 23, 2023 05:32
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Fixed sanitizer complaint about memcpy NULL, and rebased onto #6802 for flake fixes.

Changelog-Added: Plugins: plugins can now specify (unknown) even messages we should accept from peers.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We re-send whenever a plugin which allows them starts/finishes.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
It's your funeral!

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
@rustyrussell rustyrussell merged commit dfe207d into ElementsProject:master Oct 24, 2023
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Add ability to send even numbered messages in sendcustommsg
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