blob: 4ecae628e95e891760089c4efdb34173ac9784d9 [file] [log] [blame]
// Copyright 2019 The Go 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 main
import (
"context"
"errors"
"flag"
"fmt"
"io"
"log"
"net"
"os"
"golang.org/x/build/buildlet"
"golang.org/x/sync/errgroup"
)
const rdpPort = 3389
func rdp(args []string) error {
fs := flag.NewFlagSet("rdp", flag.ContinueOnError)
fs.Usage = func() {
fmt.Fprintln(os.Stderr, "rdp usage: gomote rdp [--listen=...] <instance>")
fs.PrintDefaults()
os.Exit(1)
}
var listen string
fs.StringVar(&listen, "listen", "localhost:"+fmt.Sprint(rdpPort), "local address to listen on")
fs.Parse(args)
if fs.NArg() != 1 {
fs.Usage()
}
name := fs.Arg(0)
bc, err := remoteClient(name)
if err != nil {
return err
}
ln, err := net.Listen("tcp", listen)
if err != nil {
return err
}
log.Printf("Listening on %v to proxy RDP.", ln.Addr())
for {
c, err := ln.Accept()
if err != nil {
return err
}
go handleRDPConn(bc, c)
}
}
func handleRDPConn(bc *buildlet.Client, c net.Conn) {
const Lmsgprefix = 64 // new in Go 1.14, harmless before
log := log.New(os.Stderr, c.RemoteAddr().String()+": ", log.LstdFlags|Lmsgprefix)
log.Printf("accepted connection, dialing buildlet via coordinator proxy...")
rwc, err := bc.ProxyTCP(rdpPort)
if err != nil {
c.Close()
log.Printf("failed to connect to buildlet via coordinator: %v", err)
return
}
log.Printf("connected to buildlet; proxying data.")
grp, ctx := errgroup.WithContext(context.Background())
grp.Go(func() error {
_, err := io.Copy(rwc, c)
if err == nil {
return errors.New("local client closed")
}
return fmt.Errorf("error copying from local to remote: %v", err)
})
grp.Go(func() error {
_, err := io.Copy(c, rwc)
if err == nil {
return errors.New("remote server closed")
}
return fmt.Errorf("error copying from remote to local: %v", err)
})
<-ctx.Done()
rwc.Close()
c.Close()
log.Printf("closing RDP connection: %v", grp.Wait())
}