protocols: Implement Direct Connection Upgrade through Relay (dcutr) #2076
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This commit adds an implementation for the circuit relay v2 protocol to be used as a relay server, i.e. it supports incoming HOP requests and outgoing STOP requests. Future commits will add support for clients, i.e. outgoing HOP requests and incoming STOP requests. The existing circuit relay v1 protocol implementation is moved to protocols/relay/src/v1.
From the multistream-select 1.0 simultaneous open protocol extension specification: > In order to support direct connections through NATs with hole punching, we need to account for simultaneous open. In such cases, there is no single initiator and responder, but instead both peers act as initiators. This breaks protocol negotiation in multistream-select, which assumes a single initator. > This draft proposes a simple extension to the multistream protocol negotiation in order to select a single initator when both peers are acting as such. See libp2p/specs#196 for details. This commit implements the above specification, available via `Version::V1SimOpen`.
This was referenced May 25, 2021
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This pull request implements the Direct Connection Upgrade through Relay specification. For the greater picture please see #2052 and libp2p/specs#312.
Status quo
It builds on top of #2059 and #2066. Please post review comments related to circuit relay v2 and simultaneous open on #2059 and #2066.