Subject: Re: [bitcoin-dev] Generalizing feature negotiation when new p2p connections are setup

From: Eric Voskuil <[email-masked]>
Date: Thu, 20 Aug 2020 21:25:08 -0700

Hi Anthony,

This is what I was implying in my last post (the reference to the unnecessary overload of message typing). However, if one imagines a sequence diagram for this communication it becomes obvious that all such messages are 100% redundant with verack.

e

> On Aug 20, 2020, at 19:37, Anthony Towns via bitcoin-dev <[email-masked]> wrote:
> 
> On Fri, Aug 14, 2020 at 03:28:41PM -0400, Suhas Daftuar via bitcoin-dev wrote:
>> In thinking about the mechanism used there, I thought it would be helpful to
>> codify in a BIP the idea that Bitcoin network clients should ignore unknown
>> messages received before a VERACK.  A draft of my proposal is available here
>> [2].
> 
> Rather than allowing arbitrary messages, maybe it would make sense to
> have a specific feature negotiation message, eg:
> 
>  VERSION ...
>  FEATURE wtxidrelay
>  FEATURE packagerelay
>  VERACK
> 
> with the behaviour being that it's valid only between VERSION and VERACK,
> and it takes a length-prefixed-string giving the feature name, optional
> additional data, and if the feature name isn't recognised the message
> is ignored.
> 
> If we were to support a "polite disconnect" feature like Jeremy suggested,
> it might be easier to do that for a generic FEATURE message, than
> reimplement it for the message proposed by each new feature.
> 
> Cheers,
> aj
> 
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