mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-26 11:35:35 +00:00
a9f32656f5
We can't do Noise-over-HTTP in Wasm/JS (because we don't have bidirectional communication), but we should be able to do it over WebSockets. Reuses derp WebSocket support that allows us to turn a WebSocket connection into a net.Conn. Updates #3157 Signed-off-by: Mihai Parparita <mihai@tailscale.com>
57 lines
1.6 KiB
Go
57 lines
1.6 KiB
Go
// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package controlhttp
|
|
|
|
import (
|
|
"context"
|
|
"encoding/base64"
|
|
"net"
|
|
"net/url"
|
|
|
|
"nhooyr.io/websocket"
|
|
"tailscale.com/control/controlbase"
|
|
"tailscale.com/net/dnscache"
|
|
"tailscale.com/net/wsconn"
|
|
"tailscale.com/types/key"
|
|
)
|
|
|
|
// Variant of Dial that tunnels the request over WebScokets, since we cannot do
|
|
// bi-directional communication over an HTTP connection when in JS.
|
|
func Dial(ctx context.Context, addr string, machineKey key.MachinePrivate, controlKey key.MachinePublic, protocolVersion uint16, dialer dnscache.DialContextFunc) (*controlbase.Conn, error) {
|
|
init, cont, err := controlbase.ClientDeferred(machineKey, controlKey, protocolVersion)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
host, addr, err := net.SplitHostPort(addr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
wsURL := &url.URL{
|
|
Scheme: "ws",
|
|
Host: net.JoinHostPort(host, addr),
|
|
Path: serverUpgradePath,
|
|
// Can't set HTTP headers on the websocket request, so we have to to send
|
|
// the handshake via an HTTP header.
|
|
RawQuery: url.Values{
|
|
handshakeHeaderName: []string{base64.StdEncoding.EncodeToString(init)},
|
|
}.Encode(),
|
|
}
|
|
wsConn, _, err := websocket.Dial(ctx, wsURL.String(), &websocket.DialOptions{
|
|
Subprotocols: []string{upgradeHeaderValue},
|
|
})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
netConn := wsconn.New(wsConn)
|
|
cbConn, err := cont(ctx, netConn)
|
|
if err != nil {
|
|
netConn.Close()
|
|
return nil, err
|
|
}
|
|
return cbConn, nil
|
|
|
|
}
|