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8b492b4121
This makes wsconn.Conns somewhat present reasonably when they are the client of an http.Request, rather than just put a placeholder in that field. Updates tailscale/corp#13777 Signed-off-by: David Anderson <danderson@tailscale.com>
62 lines
1.7 KiB
Go
62 lines
1.7 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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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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"tailscale.com/net/wsconn"
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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) (*ClientConn, 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 using a custom control server (on a non-standard port), prefer that.
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// This mirrors the port selection in newNoiseClient from noise.go.
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if d.HTTPPort != "" && d.HTTPPort != "80" && d.HTTPSPort == "443" {
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wsScheme = "ws"
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host = net.JoinHostPort(host, d.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 := wsconn.NetConn(context.Background(), wsConn, websocket.MessageBinary, wsURL.String())
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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 &ClientConn{Conn: cbConn}, nil
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}
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