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57 lines
1.6 KiB
Go
57 lines
1.6 KiB
Go
// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package controlhttp
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import (
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"context"
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"encoding/base64"
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"net"
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"net/url"
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"nhooyr.io/websocket"
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"tailscale.com/control/controlbase"
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"tailscale.com/net/dnscache"
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"tailscale.com/types/key"
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)
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// Variant of Dial that tunnels the request over WebSockets, since we cannot do
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// bi-directional communication over an HTTP connection when in JS.
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func Dial(ctx context.Context, host string, httpPort string, httpsPort string, machineKey key.MachinePrivate, controlKey key.MachinePublic, protocolVersion uint16, dialer dnscache.DialContextFunc) (*controlbase.Conn, error) {
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init, cont, err := controlbase.ClientDeferred(machineKey, controlKey, protocolVersion)
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if err != nil {
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return nil, err
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}
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wsScheme := "wss"
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if host == "localhost" {
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wsScheme = "ws"
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host = net.JoinHostPort(host, httpPort)
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}
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wsURL := &url.URL{
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Scheme: wsScheme,
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Host: host,
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Path: serverUpgradePath,
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// Can't set HTTP headers on the websocket request, so we have to to send
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// the handshake via an HTTP header.
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RawQuery: url.Values{
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handshakeHeaderName: []string{base64.StdEncoding.EncodeToString(init)},
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}.Encode(),
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}
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wsConn, _, err := websocket.Dial(ctx, wsURL.String(), &websocket.DialOptions{
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Subprotocols: []string{upgradeHeaderValue},
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})
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if err != nil {
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return nil, err
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}
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netConn := websocket.NetConn(context.Background(), wsConn, websocket.MessageBinary)
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cbConn, err := cont(ctx, netConn)
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if err != nil {
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netConn.Close()
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return nil, err
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}
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return cbConn, nil
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}
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