execute only first entered in therminal

[mykolq]

//go:build linux
// +build linux

package main

import (
	"io"
	"os"
	"os/exec"
	"time"

	"github.com/creack/pty"
)

func main() {

	cliPath := "/usr/bin/ssh"
	sshOpenSession := exec.Command(cliPath, "user@address", "-c", "aes128-cbc", "-o", "StrictHostKeyChecking=no")

	ptm, err := pty.Start(sshOpenSession)
	if err != nil {
		panic(err)
	}
	defer func() { _ = ptm.Close() }()
	time.Sleep(5 * time.Second)
	go func() {
		ptm.Write([]byte("password\n"))
		//time.Sleep(2 * time.Second)
		ptm.Write([]byte("test\n"))
		ptm.Write([]byte("exit\n"))
	}()
	io.Copy(os.Stdout, ptm)
	ptm.Close()
}

i start this code and it seems that code only entered password, but no startig test and exit commands. am i use it wrong?

[creack]

This is completely dependent on what cliPath is and how it behaves.
The code looks correct, it would write a few things to the terminal.
Make sure you set yourline discipline / termcaps as the cli (ssh) expects.

If you are trying to actually type the password from the tty, I would recommend to consider using a ssh key instead.

Not sure how the ssh password inputs works, but trying your code with a ssh key works as expected.

That would fall more under the golang.org/x/term library or similar as it is not a pty issue.

[theclapp]

@mykolq - I believe ssh reads the pw from the process's "controlling tty", not from stdin and not necessarily the current tty. I don't know if this library sets the "controlling tty" setting by default, or if it even can. (If it does or can I'd love to hear about it, for my own app.)

I think there are arguments you can give to ps to show a process's controlling tty, and strace could be useful to see exactly what file handle a process is reading from.

I know that's handwavy and vague but I hope it points you in the right direction.

[mykolq]

@theclapp I have decided to use python for this task. Thanks for answer