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tailscale/control/controlhttp/client_js.go

62 lines
1.7 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"
"errors"
"net"
"net/url"
"nhooyr.io/websocket"
"tailscale.com/control/controlbase"
)
// Variant of Dial that tunnels the request over WebSockets, since we cannot do
// bi-directional communication over an HTTP connection when in JS.
func (d *Dialer) Dial(ctx context.Context) (*controlbase.Conn, error) {
if d.Hostname == "" {
return nil, errors.New("required Dialer.Hostname empty")
}
init, cont, err := controlbase.ClientDeferred(d.MachineKey, d.ControlKey, d.ProtocolVersion)
if err != nil {
return nil, err
}
wsScheme := "wss"
host := d.Hostname
// If using a custom control server (on a non-standard port), prefer that.
// This mirrors the port selection in newNoiseClient from noise.go.
if d.HTTPPort != "" && d.HTTPPort != "80" && d.HTTPSPort == "443" {
wsScheme = "ws"
host = net.JoinHostPort(host, d.HTTPPort)
}
wsURL := &url.URL{
Scheme: wsScheme,
Host: host,
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 := websocket.NetConn(context.Background(), wsConn, websocket.MessageBinary)
cbConn, err := cont(ctx, netConn)
if err != nil {
netConn.Close()
return nil, err
}
return cbConn, nil
}