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main.go
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package main
import (
"flag"
"fmt"
"io"
"log"
"net"
"net/http"
"os"
"os/user"
"golang.org/x/crypto/ssh"
"golang.org/x/net/websocket"
)
var local bool
var pass string
func init() {
flag.BoolVar(&local, "local", false, "listen locally - do not connect to any host")
pass = "root"
if os.Getenv("SSH_PASSWORD") != "" {
pass = os.Getenv("SSH_PASSWORD")
}
}
func main() {
flag.Parse()
mux := &http.ServeMux{}
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
fmt.Fprint(w, WEBPAGE)
})
mux.Handle("/echo", websocket.Handler(func(c *websocket.Conn) {
io.Copy(c, c)
}))
s := http.Server{Handler: mux}
// select between a standard listener, or a listener forwarded though ssh
var l net.Listener
if local {
var err error
l, err = net.Listen("tcp", ":13337")
if err != nil {
panic(err)
}
} else {
if len(os.Args) <= 1 {
log.Fatalf("no ssh address specified")
}
u, err := user.Current()
if err != nil {
panic(err)
}
conn, err := ssh.Dial("tcp", os.Args[1],
&ssh.ClientConfig{
User: u.Username,
Auth: []ssh.AuthMethod{
ssh.Password(pass),
},
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
},
)
if err != nil {
log.Panicf("unable to dial ssh host %s: %s", os.Args[1], err)
}
defer conn.Close()
l, err = conn.Listen("tcp", "localhost:13337")
if err != nil {
log.Panicf("unable to forward embedded webserver: %s", err)
}
}
log.Printf("%T listening on %s", l, l.Addr())
err := s.Serve(l)
log.Fatalf("Webserver exited with error: %s", err)
}
const WEBPAGE = `
<html>
<head>
<script>
var i = 0;
const socket = new WebSocket("ws://"+window.location.host+"/echo");
socket.addEventListener("message", (event) => {
console.log("Message from server", event.data);
});
setInterval(function() {
if (socket.readyState != WebSocket.OPEN) {
console.log("Socket not Open:", socket.readyState, "!=", WebSocket.OPEN)
return
}
socket.send("Hello websocket, this is number " + i);
i++;
}, 1000)
</script>
</head>
<body>
</body>
`