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control/controlbase: enable asynchronous client handshaking.

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With this change, the client can obtain the initial handshake message
separately from the rest of the handshake, for embedding into another
protocol. This enables things like RTT reduction by stuffing the
handshake initiation message into an HTTP header.

Similarly, the server API optionally accepts a pre-read Noise initiation
message, in addition to reading the message directly off a net.Conn.

Updates #3488

Signed-off-by: David Anderson <danderson@tailscale.com>
This commit is contained in:
David Anderson
2022-01-17 15:30:30 -08:00
committed by Dave Anderson
parent 6cd180746f
commit d5a7eabcd0
5 changed files with 84 additions and 35 deletions
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4
control/controlbase/conn.go
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@@ -2,8 +2,8 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package noise implements the base transport of the Tailscale 2021
// control protocol.
// Package controlbase implements the base transport of the Tailscale
// 2021 control protocol.
//
// The base transport implements Noise IK, instantiated with
// Curve25519, ChaCha20Poly1305 and BLAKE2s.