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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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12
control/controlbase/handshake_test.go
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@@ -26,7 +26,7 @@ func TestHandshake(t *testing.T) {
)
go func() {
var err error
server, err = Server(context.Background(), serverConn, serverKey)
server, err = Server(context.Background(), serverConn, serverKey, nil)
serverErr <- err
}()
@@ -78,7 +78,7 @@ func TestNoReuse(t *testing.T) {
)
go func() {
var err error
server, err = Server(context.Background(), serverConn, serverKey)
server, err = Server(context.Background(), serverConn, serverKey, nil)
serverErr <- err
}()
@@ -172,7 +172,7 @@ func TestTampering(t *testing.T) {
serverErr = make(chan error, 1)
)
go func() {
_, err := Server(context.Background(), serverConn, serverKey)
_, err := Server(context.Background(), serverConn, serverKey, nil)
// If the server failed, we have to close the Conn to
// unblock the client.
if err != nil {
@@ -200,7 +200,7 @@ func TestTampering(t *testing.T) {
serverErr = make(chan error, 1)
)
go func() {
_, err := Server(context.Background(), serverConn, serverKey)
_, err := Server(context.Background(), serverConn, serverKey, nil)
serverErr <- err
}()
@@ -225,7 +225,7 @@ func TestTampering(t *testing.T) {
serverErr = make(chan error, 1)
)
go func() {
server, err := Server(context.Background(), serverConn, serverKey)
server, err := Server(context.Background(), serverConn, serverKey, nil)
serverErr <- err
_, err = io.WriteString(server, strings.Repeat("a", 14))
serverErr <- err
@@ -266,7 +266,7 @@ func TestTampering(t *testing.T) {
serverErr = make(chan error, 1)
)
go func() {
server, err := Server(context.Background(), serverConn, serverKey)
server, err := Server(context.Background(), serverConn, serverKey, nil)
serverErr <- err
var bs [100]byte
// The server needs a timeout if the tampering is hitting the length header.