mirror of https://github.com/tailscale/tailscale/
control/controlhttp: package to get a controlbase.Conn over HTTP(S).
Updates #3488 Signed-off-by: David Anderson <danderson@tailscale.com>pull/3759/head
David Anderson
3 years ago
committed by
Dave Anderson
parent
d5a7eabcd0
commit
96f008cf87
@ -0,0 +1,242 @@
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// Copyright (c) 2021 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 implements the Tailscale 2021 control protocol
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// base transport over HTTP.
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//
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// This tunnels the protocol in control/controlbase over HTTP with a
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// variety of compatibility fallbacks for handling picky or deep
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// inspecting proxies.
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//
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// In the happy path, a client makes a single cleartext HTTP request
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// to the server, the server responds with 101 Switching Protocols,
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// and the control base protocol takes place over plain TCP.
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//
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// In the compatibility path, the client does the above over HTTPS,
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// resulting in double encryption (once for the control transport, and
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// once for the outer TLS layer).
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package controlhttp
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import (
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"context"
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"crypto/tls"
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"encoding/base64"
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"errors"
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"fmt"
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"io"
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"log"
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"net"
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"net/http"
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"net/http/httptrace"
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"net/url"
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"tailscale.com/control/controlbase"
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"tailscale.com/net/dnscache"
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"tailscale.com/net/dnsfallback"
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"tailscale.com/net/netns"
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"tailscale.com/net/tlsdial"
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"tailscale.com/net/tshttpproxy"
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"tailscale.com/types/key"
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)
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// upgradeHeader is the value of the Upgrade HTTP header used to
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// indicate the Tailscale control protocol.
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const (
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upgradeHeaderValue = "tailscale-control-protocol"
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handshakeHeaderName = "X-Tailscale-Handshake"
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)
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// Dial connects to the HTTP server at addr, requests to switch to the
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// Tailscale control protocol, and returns an established control
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// protocol connection.
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//
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// If Dial fails to connect using addr, it also tries to tunnel over
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// TLS to <addr's host>:443 as a compatibility fallback.
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func Dial(ctx context.Context, addr string, machineKey key.MachinePrivate, controlKey key.MachinePublic) (*controlbase.Conn, error) {
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host, port, err := net.SplitHostPort(addr)
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if err != nil {
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return nil, err
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}
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a := &dialParams{
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ctx: ctx,
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host: host,
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httpPort: port,
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httpsPort: "443",
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machineKey: machineKey,
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controlKey: controlKey,
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proxyFunc: tshttpproxy.ProxyFromEnvironment,
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}
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return a.dial()
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}
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type dialParams struct {
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ctx context.Context
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host string
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httpPort string
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httpsPort string
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machineKey key.MachinePrivate
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controlKey key.MachinePublic
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proxyFunc func(*http.Request) (*url.URL, error) // or nil
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// For tests only
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insecureTLS bool
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}
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func (a *dialParams) dial() (*controlbase.Conn, error) {
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init, cont, err := controlbase.ClientDeferred(a.machineKey, a.controlKey)
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if err != nil {
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return nil, err
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}
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u := &url.URL{
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Scheme: "http",
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Host: net.JoinHostPort(a.host, a.httpPort),
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Path: "/switch",
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}
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conn, httpErr := a.tryURL(u, init)
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if httpErr == nil {
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ret, err := cont(a.ctx, conn)
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if err != nil {
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conn.Close()
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return nil, err
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}
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return ret, nil
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}
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// Connecting over plain HTTP failed, assume it's an HTTP proxy
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// being difficult and see if we can get through over HTTPS.
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u.Scheme = "https"
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u.Host = net.JoinHostPort(a.host, a.httpsPort)
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init, cont, err = controlbase.ClientDeferred(a.machineKey, a.controlKey)
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if err != nil {
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return nil, err
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}
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conn, tlsErr := a.tryURL(u, init)
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if tlsErr == nil {
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ret, err := cont(a.ctx, conn)
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if err != nil {
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conn.Close()
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return nil, err
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}
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return ret, nil
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}
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return nil, fmt.Errorf("all connection attempts failed (HTTP: %v, HTTPS: %v)", httpErr, tlsErr)
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}
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func (a *dialParams) tryURL(u *url.URL, init []byte) (net.Conn, error) {
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dns := &dnscache.Resolver{
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Forward: dnscache.Get().Forward,
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LookupIPFallback: dnsfallback.Lookup,
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UseLastGood: true,
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}
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dialer := netns.NewDialer(log.Printf)
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tr := http.DefaultTransport.(*http.Transport).Clone()
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defer tr.CloseIdleConnections()
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tr.Proxy = a.proxyFunc
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tshttpproxy.SetTransportGetProxyConnectHeader(tr)
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tr.DialContext = dnscache.Dialer(dialer.DialContext, dns)
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// Disable HTTP2, since h2 can't do protocol switching.
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tr.TLSClientConfig.NextProtos = []string{}
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tr.TLSNextProto = map[string]func(string, *tls.Conn) http.RoundTripper{}
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tr.TLSClientConfig = tlsdial.Config(a.host, tr.TLSClientConfig)
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if a.insecureTLS {
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tr.TLSClientConfig.InsecureSkipVerify = true
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tr.TLSClientConfig.VerifyConnection = nil
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}
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tr.DialTLSContext = dnscache.TLSDialer(dialer.DialContext, dns, tr.TLSClientConfig)
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tr.DisableCompression = true
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// (mis)use httptrace to extract the underlying net.Conn from the
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// transport. We make exactly 1 request using this transport, so
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// there will be exactly 1 GotConn call. Additionally, the
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// transport handles 101 Switching Protocols correctly, such that
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// the Conn will not be reused or kept alive by the transport once
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// the response has been handed back from RoundTrip.
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//
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// In theory, the machinery of net/http should make it such that
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// the trace callback happens-before we get the response, but
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// there's no promise of that. So, to make sure, we use a buffered
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// channel as a synchronization step to avoid data races.
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//
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// Note that even though we're able to extract a net.Conn via this
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// mechanism, we must still keep using the eventual resp.Body to
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// read from, because it includes a buffer we can't get rid of. If
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// the server never sends any data after sending the HTTP
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// response, we could get away with it, but violating this
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// assumption leads to very mysterious transport errors (lockups,
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// unexpected EOFs...), and we're bound to forget someday and
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// introduce a protocol optimization at a higher level that starts
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// eagerly transmitting from the server.
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connCh := make(chan net.Conn, 1)
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trace := httptrace.ClientTrace{
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GotConn: func(info httptrace.GotConnInfo) {
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connCh <- info.Conn
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},
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}
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ctx := httptrace.WithClientTrace(a.ctx, &trace)
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req := &http.Request{
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Method: "POST",
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URL: u,
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Header: http.Header{
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"Upgrade": []string{upgradeHeaderValue},
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"Connection": []string{"upgrade"},
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handshakeHeaderName: []string{base64.StdEncoding.EncodeToString(init)},
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},
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}
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req = req.WithContext(ctx)
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resp, err := tr.RoundTrip(req)
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if err != nil {
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return nil, err
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}
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if resp.StatusCode != http.StatusSwitchingProtocols {
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return nil, fmt.Errorf("unexpected HTTP response: %s", resp.Status)
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}
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// From here on, the underlying net.Conn is ours to use, but there
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// is still a read buffer attached to it within resp.Body. So, we
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// must direct I/O through resp.Body, but we can still use the
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// underlying net.Conn for stuff like deadlines.
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var switchedConn net.Conn
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select {
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case switchedConn = <-connCh:
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default:
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}
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if switchedConn == nil {
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resp.Body.Close()
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return nil, fmt.Errorf("httptrace didn't provide a connection")
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}
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if next := resp.Header.Get("Upgrade"); next != upgradeHeaderValue {
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resp.Body.Close()
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return nil, fmt.Errorf("server switched to unexpected protocol %q", next)
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}
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rwc, ok := resp.Body.(io.ReadWriteCloser)
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if !ok {
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resp.Body.Close()
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return nil, errors.New("http Transport did not provide a writable body")
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}
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return &wrappedConn{switchedConn, rwc}, nil
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}
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type wrappedConn struct {
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net.Conn
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rwc io.ReadWriteCloser
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}
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func (w *wrappedConn) Read(bs []byte) (int, error) {
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return w.rwc.Read(bs)
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}
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func (w *wrappedConn) Write(bs []byte) (int, error) {
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return w.rwc.Write(bs)
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}
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func (w *wrappedConn) Close() error {
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return w.rwc.Close()
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}
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@ -0,0 +1,398 @@
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// Copyright (c) 2021 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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"crypto/tls"
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"fmt"
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"io"
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"log"
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"net"
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"net/http"
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"net/http/httputil"
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"net/url"
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"strconv"
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"sync"
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"testing"
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"tailscale.com/control/controlbase"
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"tailscale.com/net/socks5"
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"tailscale.com/types/key"
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)
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func TestControlHTTP(t *testing.T) {
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tests := []struct {
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name string
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proxy proxy
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}{
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// direct connection
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{
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name: "no_proxy",
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proxy: nil,
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},
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// SOCKS5
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{
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name: "socks5",
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proxy: &socksProxy{},
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},
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// HTTP->HTTP
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{
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name: "http_to_http",
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proxy: &httpProxy{
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useTLS: false,
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allowConnect: false,
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allowHTTP: true,
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},
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},
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// HTTP->HTTPS
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{
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name: "http_to_https",
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proxy: &httpProxy{
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useTLS: false,
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allowConnect: true,
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allowHTTP: false,
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},
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},
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// HTTP->any (will pick HTTP)
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{
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name: "http_to_any",
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proxy: &httpProxy{
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useTLS: false,
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allowConnect: true,
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allowHTTP: true,
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},
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},
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// HTTPS->HTTP
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{
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name: "https_to_http",
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proxy: &httpProxy{
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useTLS: true,
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allowConnect: false,
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allowHTTP: true,
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},
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},
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// HTTPS->HTTPS
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{
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name: "https_to_https",
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proxy: &httpProxy{
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useTLS: true,
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allowConnect: true,
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allowHTTP: false,
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},
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},
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// HTTPS->any (will pick HTTP)
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{
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name: "https_to_any",
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proxy: &httpProxy{
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useTLS: true,
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allowConnect: true,
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allowHTTP: true,
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},
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},
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}
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for _, test := range tests {
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t.Run(test.name, func(t *testing.T) {
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testControlHTTP(t, test.proxy)
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})
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}
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}
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func testControlHTTP(t *testing.T, proxy proxy) {
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client, server := key.NewMachine(), key.NewMachine()
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sch := make(chan serverResult, 1)
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handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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conn, err := AcceptHTTP(context.Background(), w, r, server)
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if err != nil {
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log.Print(err)
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}
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res := serverResult{
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err: err,
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}
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if conn != nil {
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res.clientAddr = conn.RemoteAddr().String()
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res.version = conn.ProtocolVersion()
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res.peer = conn.Peer()
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res.conn = conn
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}
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sch <- res
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})
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httpLn, err := net.Listen("tcp", "127.0.0.1:0")
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if err != nil {
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t.Fatalf("HTTP listen: %v", err)
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}
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httpsLn, err := net.Listen("tcp", "127.0.0.1:0")
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if err != nil {
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t.Fatalf("HTTPS listen: %v", err)
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}
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httpServer := &http.Server{Handler: handler}
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go httpServer.Serve(httpLn)
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defer httpServer.Close()
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httpsServer := &http.Server{
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Handler: handler,
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TLSConfig: tlsConfig(t),
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}
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go httpsServer.ServeTLS(httpsLn, "", "")
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defer httpsServer.Close()
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//ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
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//defer cancel()
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a := dialParams{
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ctx: context.Background(), //ctx,
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host: "localhost",
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httpPort: strconv.Itoa(httpLn.Addr().(*net.TCPAddr).Port),
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httpsPort: strconv.Itoa(httpsLn.Addr().(*net.TCPAddr).Port),
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machineKey: client,
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controlKey: server.Public(),
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insecureTLS: true,
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}
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if proxy != nil {
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proxyEnv := proxy.Start(t)
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defer proxy.Close()
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proxyURL, err := url.Parse(proxyEnv)
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if err != nil {
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t.Fatal(err)
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}
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a.proxyFunc = func(*http.Request) (*url.URL, error) {
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return proxyURL, nil
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}
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} else {
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a.proxyFunc = func(*http.Request) (*url.URL, error) {
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return nil, nil
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}
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}
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conn, err := a.dial()
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if err != nil {
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t.Fatalf("dialing controlhttp: %v", err)
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}
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defer conn.Close()
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si := <-sch
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if si.conn != nil {
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defer si.conn.Close()
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}
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if si.err != nil {
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t.Fatalf("controlhttp server got error: %v", err)
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}
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if clientVersion := conn.ProtocolVersion(); si.version != clientVersion {
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t.Fatalf("client and server don't agree on protocol version: %d vs %d", clientVersion, si.version)
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}
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if si.peer != client.Public() {
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t.Fatalf("server got peer pubkey %s, want %s", si.peer, client.Public())
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}
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if spub := conn.Peer(); spub != server.Public() {
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t.Fatalf("client got peer pubkey %s, want %s", spub, server.Public())
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}
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if proxy != nil && !proxy.ConnIsFromProxy(si.clientAddr) {
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t.Fatalf("client connected from %s, which isn't the proxy", si.clientAddr)
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}
|
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}
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type serverResult struct {
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err error
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clientAddr string
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version int
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peer key.MachinePublic
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conn *controlbase.Conn
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}
|
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|
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type proxy interface {
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Start(*testing.T) string
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Close()
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ConnIsFromProxy(string) bool
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}
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|
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type socksProxy struct {
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sync.Mutex
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proxy socks5.Server
|
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ln net.Listener
|
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clientConnAddrs map[string]bool // addrs of the local end of outgoing conns from proxy
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||||
}
|
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|
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func (s *socksProxy) Start(t *testing.T) (url string) {
|
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t.Helper()
|
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s.Lock()
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defer s.Unlock()
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ln, err := net.Listen("tcp", "127.0.0.1:0")
|
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if err != nil {
|
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t.Fatalf("listening for SOCKS server: %v", err)
|
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}
|
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s.ln = ln
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s.clientConnAddrs = map[string]bool{}
|
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s.proxy.Logf = t.Logf
|
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s.proxy.Dialer = s.dialAndRecord
|
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go s.proxy.Serve(ln)
|
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return fmt.Sprintf("socks5://%s", ln.Addr().String())
|
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}
|
||||
|
||||
func (s *socksProxy) Close() {
|
||||
s.Lock()
|
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defer s.Unlock()
|
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s.ln.Close()
|
||||
}
|
||||
|
||||
func (s *socksProxy) dialAndRecord(ctx context.Context, network, addr string) (net.Conn, error) {
|
||||
var d net.Dialer
|
||||
conn, err := d.DialContext(ctx, network, addr)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
s.Lock()
|
||||
defer s.Unlock()
|
||||
s.clientConnAddrs[conn.LocalAddr().String()] = true
|
||||
return conn, nil
|
||||
}
|
||||
|
||||
func (s *socksProxy) ConnIsFromProxy(addr string) bool {
|
||||
s.Lock()
|
||||
defer s.Unlock()
|
||||
return s.clientConnAddrs[addr]
|
||||
}
|
||||
|
||||
type httpProxy struct {
|
||||
useTLS bool // take incoming connections over TLS
|
||||
allowConnect bool // allow CONNECT for TLS
|
||||
allowHTTP bool // allow plain HTTP proxying
|
||||
|
||||
sync.Mutex
|
||||
ln net.Listener
|
||||
rp httputil.ReverseProxy
|
||||
s http.Server
|
||||
clientConnAddrs map[string]bool // addrs of the local end of outgoing conns from proxy
|
||||
}
|
||||
|
||||
func (h *httpProxy) Start(t *testing.T) (url string) {
|
||||
t.Helper()
|
||||
h.Lock()
|
||||
defer h.Unlock()
|
||||
ln, err := net.Listen("tcp", "127.0.0.1:0")
|
||||
if err != nil {
|
||||
t.Fatalf("listening for HTTP proxy: %v", err)
|
||||
}
|
||||
h.ln = ln
|
||||
h.rp = httputil.ReverseProxy{
|
||||
Director: func(*http.Request) {},
|
||||
Transport: &http.Transport{
|
||||
DialContext: h.dialAndRecord,
|
||||
TLSClientConfig: &tls.Config{
|
||||
InsecureSkipVerify: true,
|
||||
},
|
||||
TLSNextProto: map[string]func(string, *tls.Conn) http.RoundTripper{},
|
||||
},
|
||||
}
|
||||
h.clientConnAddrs = map[string]bool{}
|
||||
h.s.Handler = h
|
||||
if h.useTLS {
|
||||
h.s.TLSConfig = tlsConfig(t)
|
||||
go h.s.ServeTLS(h.ln, "", "")
|
||||
return fmt.Sprintf("https://%s", ln.Addr().String())
|
||||
} else {
|
||||
go h.s.Serve(h.ln)
|
||||
return fmt.Sprintf("http://%s", ln.Addr().String())
|
||||
}
|
||||
}
|
||||
|
||||
func (h *httpProxy) Close() {
|
||||
h.Lock()
|
||||
defer h.Unlock()
|
||||
h.s.Close()
|
||||
}
|
||||
|
||||
func (h *httpProxy) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
||||
if r.Method != "CONNECT" {
|
||||
if !h.allowHTTP {
|
||||
http.Error(w, "http proxy not allowed", 500)
|
||||
return
|
||||
}
|
||||
h.rp.ServeHTTP(w, r)
|
||||
return
|
||||
}
|
||||
|
||||
if !h.allowConnect {
|
||||
http.Error(w, "connect not allowed", 500)
|
||||
return
|
||||
}
|
||||
|
||||
dst := r.RequestURI
|
||||
c, err := h.dialAndRecord(context.Background(), "tcp", dst)
|
||||
if err != nil {
|
||||
http.Error(w, err.Error(), 500)
|
||||
return
|
||||
}
|
||||
defer c.Close()
|
||||
|
||||
cc, ccbuf, err := w.(http.Hijacker).Hijack()
|
||||
if err != nil {
|
||||
http.Error(w, err.Error(), 500)
|
||||
return
|
||||
}
|
||||
defer cc.Close()
|
||||
|
||||
io.WriteString(cc, "HTTP/1.1 200 OK\r\n\r\n")
|
||||
|
||||
errc := make(chan error, 1)
|
||||
go func() {
|
||||
_, err := io.Copy(cc, c)
|
||||
errc <- err
|
||||
}()
|
||||
go func() {
|
||||
_, err := io.Copy(c, ccbuf)
|
||||
errc <- err
|
||||
}()
|
||||
<-errc
|
||||
}
|
||||
|
||||
func (h *httpProxy) dialAndRecord(ctx context.Context, network, addr string) (net.Conn, error) {
|
||||
var d net.Dialer
|
||||
conn, err := d.DialContext(ctx, network, addr)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
h.Lock()
|
||||
defer h.Unlock()
|
||||
h.clientConnAddrs[conn.LocalAddr().String()] = true
|
||||
return conn, nil
|
||||
}
|
||||
|
||||
func (h *httpProxy) ConnIsFromProxy(addr string) bool {
|
||||
h.Lock()
|
||||
defer h.Unlock()
|
||||
return h.clientConnAddrs[addr]
|
||||
}
|
||||
|
||||
func tlsConfig(t *testing.T) *tls.Config {
|
||||
// Cert and key taken from the example code in the crypto/tls
|
||||
// package.
|
||||
certPem := []byte(`-----BEGIN CERTIFICATE-----
|
||||
MIIBhTCCASugAwIBAgIQIRi6zePL6mKjOipn+dNuaTAKBggqhkjOPQQDAjASMRAw
|
||||
DgYDVQQKEwdBY21lIENvMB4XDTE3MTAyMDE5NDMwNloXDTE4MTAyMDE5NDMwNlow
|
||||
EjEQMA4GA1UEChMHQWNtZSBDbzBZMBMGByqGSM49AgEGCCqGSM49AwEHA0IABD0d
|
||||
7VNhbWvZLWPuj/RtHFjvtJBEwOkhbN/BnnE8rnZR8+sbwnc/KhCk3FhnpHZnQz7B
|
||||
5aETbbIgmuvewdjvSBSjYzBhMA4GA1UdDwEB/wQEAwICpDATBgNVHSUEDDAKBggr
|
||||
BgEFBQcDATAPBgNVHRMBAf8EBTADAQH/MCkGA1UdEQQiMCCCDmxvY2FsaG9zdDo1
|
||||
NDUzgg4xMjcuMC4wLjE6NTQ1MzAKBggqhkjOPQQDAgNIADBFAiEA2zpJEPQyz6/l
|
||||
Wf86aX6PepsntZv2GYlA5UpabfT2EZICICpJ5h/iI+i341gBmLiAFQOyTDT+/wQc
|
||||
6MF9+Yw1Yy0t
|
||||
-----END CERTIFICATE-----`)
|
||||
keyPem := []byte(`-----BEGIN EC PRIVATE KEY-----
|
||||
MHcCAQEEIIrYSSNQFaA2Hwf1duRSxKtLYX5CB04fSeQ6tF1aY/PuoAoGCCqGSM49
|
||||
AwEHoUQDQgAEPR3tU2Fta9ktY+6P9G0cWO+0kETA6SFs38GecTyudlHz6xvCdz8q
|
||||
EKTcWGekdmdDPsHloRNtsiCa697B2O9IFA==
|
||||
-----END EC PRIVATE KEY-----`)
|
||||
cert, err := tls.X509KeyPair(certPem, keyPem)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
return &tls.Config{
|
||||
Certificates: []tls.Certificate{cert},
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,95 @@
|
||||
// Copyright (c) 2021 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 (
|
||||
"bufio"
|
||||
"context"
|
||||
"encoding/base64"
|
||||
"errors"
|
||||
"fmt"
|
||||
"net"
|
||||
"net/http"
|
||||
|
||||
"tailscale.com/control/controlbase"
|
||||
"tailscale.com/types/key"
|
||||
)
|
||||
|
||||
// AcceptHTTP upgrades the HTTP request given by w and r into a
|
||||
// Tailscale control protocol base transport connection.
|
||||
//
|
||||
// AcceptHTTP always writes an HTTP response to w. The caller must not
|
||||
// attempt their own response after calling AcceptHTTP.
|
||||
func AcceptHTTP(ctx context.Context, w http.ResponseWriter, r *http.Request, private key.MachinePrivate) (*controlbase.Conn, error) {
|
||||
next := r.Header.Get("Upgrade")
|
||||
if next == "" {
|
||||
http.Error(w, "missing next protocol", http.StatusBadRequest)
|
||||
return nil, errors.New("no next protocol in HTTP request")
|
||||
}
|
||||
if next != upgradeHeaderValue {
|
||||
http.Error(w, "unknown next protocol", http.StatusBadRequest)
|
||||
return nil, fmt.Errorf("client requested unhandled next protocol %q", next)
|
||||
}
|
||||
|
||||
initB64 := r.Header.Get(handshakeHeaderName)
|
||||
if initB64 == "" {
|
||||
http.Error(w, "missing Tailscale handshake header", http.StatusBadRequest)
|
||||
return nil, errors.New("no tailscale handshake header in HTTP request")
|
||||
}
|
||||
init, err := base64.StdEncoding.DecodeString(initB64)
|
||||
if err != nil {
|
||||
http.Error(w, "invalid tailscale handshake header", http.StatusBadRequest)
|
||||
return nil, fmt.Errorf("decoding base64 handshake header: %v", err)
|
||||
}
|
||||
|
||||
hijacker, ok := w.(http.Hijacker)
|
||||
if !ok {
|
||||
http.Error(w, "make request over HTTP/1", http.StatusBadRequest)
|
||||
return nil, errors.New("can't hijack client connection")
|
||||
}
|
||||
|
||||
w.Header().Set("Upgrade", upgradeHeaderValue)
|
||||
w.Header().Set("Connection", "upgrade")
|
||||
w.WriteHeader(http.StatusSwitchingProtocols)
|
||||
|
||||
conn, brw, err := hijacker.Hijack()
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("hijacking client connection: %w", err)
|
||||
}
|
||||
if err := brw.Flush(); err != nil {
|
||||
conn.Close()
|
||||
return nil, fmt.Errorf("flushing hijacked HTTP buffer: %w", err)
|
||||
}
|
||||
if brw.Reader.Buffered() > 0 {
|
||||
conn = &drainBufConn{conn, brw.Reader}
|
||||
}
|
||||
|
||||
nc, err := controlbase.Server(ctx, conn, private, init)
|
||||
if err != nil {
|
||||
conn.Close()
|
||||
return nil, fmt.Errorf("noise handshake failed: %w", err)
|
||||
}
|
||||
|
||||
return nc, nil
|
||||
}
|
||||
|
||||
// drainBufConn is a net.Conn with an initial bunch of bytes in a
|
||||
// bufio.Reader. Read drains the bufio.Reader until empty, then passes
|
||||
// through subsequent reads to the Conn directly.
|
||||
type drainBufConn struct {
|
||||
net.Conn
|
||||
r *bufio.Reader
|
||||
}
|
||||
|
||||
func (b *drainBufConn) Read(bs []byte) (int, error) {
|
||||
if b.r == nil {
|
||||
return b.Conn.Read(bs)
|
||||
}
|
||||
n, err := b.r.Read(bs)
|
||||
if b.r.Buffered() == 0 {
|
||||
b.r = nil
|
||||
}
|
||||
return n, err
|
||||
}
|
||||
Loading…
Reference in New Issue