func handleChannel(ch ssh.NewChannel) {
if ch.ChannelType() != "session" {
log.Printf("[ERROR] unknown channel type %q", ch.ChannelType())
ch.Reject(ssh.UnknownChannelType, "unknown channel type")
return
}
channel, requests, err := ch.Accept()
if err != nil {
log.Printf("[ERROR] could not accept channel %q", err)
}
defer channel.Close()
var master, slave *os.File
defer func() {
if master != nil {
master.Close()
}
if slave != nil {
slave.Close()
}
}()
var wg sync.WaitGroup
wg.Add(1)
go func(in <-chan *ssh.Request) {
for req := range in {
log.Printf("[INFO] got request %q", req.Type)
switch req.Type {
case "shell":
if len(req.Payload) > 0 {
// do not accept any extra commands for shell
req.Reply(false, nil)
return
}
req.Reply(true, nil)
case "pty-req":
pty, tty, err := pty.Open()
if err != nil {
log.Printf("[ERROR] failed to open a pty %q", err)
return
}
master, slave = pty, tty
wg.Done()
// FIXME handle pty request
req.Reply(true, nil)
case "window-change":
// FIXME handle window resize
req.Reply(true, nil)
}
}
}(requests)
wg.Wait()
go io.Copy(channel, master)
go io.Copy(master, channel)
s := bufio.NewScanner(slave)
for {
prompt(slave)
if !s.Scan() {
break
}
line := s.Text()
// clear the terminal and continue
if line == "cls" {
fmt.Fprintf(slave, "\033[2J")
fmt.Fprintf(slave, "\033[1;1H")
continue
}
tokens := strings.Split(line, " ")
cmd := exec.Command("docker", tokens...)
cmd.Stdin = slave
cmd.Stdout = slave
cmd.Stderr = slave
cmd.SysProcAttr = &syscall.SysProcAttr{Setctty: true, Setsid: true}
log.Println("command: %#v", cmd)
if err := cmd.Start(); err != nil {
fmt.Fprintf(master, "invalid docker cmd %q\n", line)
}
if err := cmd.Wait(); err != nil {
fmt.Fprintf(master, "cmd %q failed\n", line)
}
fmt.Fprint(slave, "\r\n")
}
}
func (chi *ChanInfo) Serve(conn ssh.Conn, newChan ssh.NewChannel) (err error) {
log.Info("new channel: %s (len: %d)",
newChan.ChannelType(), len(newChan.ExtraData()))
err = chi.onType(newChan.ChannelType(), newChan.ExtraData())
if err != nil {
newChan.Reject(ssh.ResourceShortage, err.Error())
log.Error("reject channel: %s", err.Error())
return
}
chout, outreqs, err := conn.OpenChannel(
newChan.ChannelType(), newChan.ExtraData())
if err != nil {
newChan.Reject(ssh.UnknownChannelType, err.Error())
log.Error("reject channel: %s", err.Error())
return
}
log.Debug("open channel ok.")
chin, inreqs, err := newChan.Accept()
if err != nil {
log.Error("could not accept channel.")
return
}
log.Debug("accept channel ok.")
go chi.serveReqs(chin, outreqs)
go chi.serveReqs(chout, inreqs)
_, ok := <-chi.ch
if !ok {
return
}
switch chi.Type {
case "local", "remote":
go MultiCopyClose(chin, chout, &DebugStream{"out"})
go MultiCopyClose(chout, chin, &DebugStream{"in"})
case "sshagent":
go MultiCopyClose(chin, chout, &DebugStream{"out"})
go MultiCopyClose(chout, chin, &DebugStream{"in"})
case "shell":
l, err := chi.prepareFile("")
if err != nil {
return err
}
go MultiCopyClose(chin, chout, l.CreateSubLogger(byte(0x01)))
go MultiCopyClose(chout, chin, l.CreateSubLogger(byte(0x02)))
case "exec":
l, err := chi.prepareFile(strings.Join(chi.ExecCmds, "\r"))
if err != nil {
return err
}
go MultiCopyClose(chin, chout, l.CreateSubLogger(byte(0x01)))
go MultiCopyClose(chout, chin, l.CreateSubLogger(byte(0x02)))
case "scpto":
go MultiCopyClose(chin, chout, CreateScpStream(chi))
go MultiCopyClose(chout, chin)
case "scpfrom":
go MultiCopyClose(chin, chout)
go MultiCopyClose(chout, chin, CreateScpStream(chi))
default:
log.Warning("redirect before setup")
chin.Close()
chout.Close()
}
return
}
