goでx11フォワーディング付きでssh接続でシェルを利用する検証・サンプルコード(動かない)

notworking_ssh_term_x11forwarding.go

package main

import (
	"errors"
	"fmt"
	"os"
	"os/signal"
	"syscall"

	"golang.org/x/crypto/ssh"
	"golang.org/x/crypto/ssh/terminal"
)

var (
	host = "targethost"
	port = "22"
	user = "user"
	pass = "password"
)

type x11request struct {
	SingleConnection bool
	AuthProtocol     string
	AuthCookie       string
	ScreenNumber     uint32
}

type x11channel struct {
	Host string
	Port uint32
}

func main() {
	// Create sshClientConfig
	sshConfig := &ssh.ClientConfig{
		User: user,
		Auth: []ssh.AuthMethod{
			ssh.Password(pass),
		},
		HostKeyCallback: ssh.InsecureIgnoreHostKey(),
	}

	// SSH connect.
	client, err := ssh.Dial("tcp", host+":"+port, sshConfig)

	// Create Session
	session, err := client.NewSession()
	defer session.Close()

	// NOTE:
	// x11-req Payload
	payload := x11request{
		SingleConnection: false,
		AuthProtocol:     string("MIT-MAGIC-COOKIE-1"),
		AuthCookie:       string("d92c30482cc3d2de61888961deb74c08"),
		ScreenNumber:     uint32(0),
	}

	// NOTE:
	// send x11-req Request
	ok, err := session.SendRequest("x11-req", true, ssh.Marshal(payload))
	if err == nil && !ok {
		fmt.Println(errors.New("ssh: x11-req failed"))
	}
	fmt.Printf("x11-req: %v\n", ok)
	fmt.Println("-----")

	// x11 OpenChannel (Not working...)
	x11Data := x11channel{
		Host: "localhost",
		Port: uint32(6010),
	}
	x11Marshal := ssh.Marshal(x11Data)       // DEBUG
	fmt.Println(x11Marshal)                  // DEBUG
	fmt.Printf("%s\n", ssh.Marshal(x11Data)) // DEBUG

	sshChan, req, x11err := client.OpenChannel("x11", ssh.Marshal(x11Data))
	fmt.Println(sshChan) // DEBUG
	fmt.Println(req)     // DEBUG
	fmt.Println(x11err)  // DEBUG

	fd := int(os.Stdin.Fd())
	state, err := terminal.MakeRaw(fd)
	if err != nil {
		fmt.Println(err)
	}
	defer terminal.Restore(fd, state)

	// Get terminal size
	w, h, err := terminal.GetSize(fd)
	if err != nil {
		fmt.Println(err)
	}

	modes := ssh.TerminalModes{
		ssh.ECHO:          1,
		ssh.TTY_OP_ISPEED: 14400,
		ssh.TTY_OP_OSPEED: 14400,
	}

	err = session.RequestPty("xterm", h, w, modes)
	if err != nil {
		fmt.Println(err)
	}

	session.Stdout = os.Stdout
	session.Stderr = os.Stderr
	session.Stdin = os.Stdin

	// Start shell
	err = session.Shell()
	if err != nil {
		fmt.Println(err)
	}

	// sigwinch
	signal_chan := make(chan os.Signal, 1)
	signal.Notify(signal_chan, syscall.SIGWINCH)
	go func() {
		for {
			s := <-signal_chan
			switch s {
			case syscall.SIGWINCH:
				fd := int(os.Stdout.Fd())
				w, h, _ = terminal.GetSize(fd)
				session.WindowChange(h, w)
			}
		}
	}()

	err = session.Wait()
	if err != nil {
		fmt.Println(err)
	}
}