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9b71008ef2
This turns 'dialParams' into something more like net.Dialer, where configuration fields are public on the struct. Split out of #5648 Change-Id: I0c56fd151dc5489c3c94fb40d18fd639e06473bc Signed-off-by: Andrew Dunham <andrew@tailscale.com>
60 lines
1.6 KiB
Go
60 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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"errors"
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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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)
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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 (d *Dialer) Dial(ctx context.Context) (*controlbase.Conn, error) {
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if d.Hostname == "" {
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return nil, errors.New("required Dialer.Hostname empty")
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}
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init, cont, err := controlbase.ClientDeferred(d.MachineKey, d.ControlKey, d.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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host := d.Hostname
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if host == "localhost" {
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wsScheme = "ws"
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host = net.JoinHostPort(host, strDef(d.HTTPPort, "80"))
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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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