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package main
import (
"log"
"os"
"time"
"github.com/ziutek/telnet"
)
const timeout = 10 * time.Second
func checkErr(err error) {
if err != nil {
log.Fatalln("Error:", err)
}
}
func expect(t *telnet.Conn, d ...string) {
checkErr(t.SetReadDeadline(time.Now().Add(timeout)))
checkErr(t.SkipUntil(d...))
}
func sendln(t *telnet.Conn, s string) {
checkErr(t.SetWriteDeadline(time.Now().Add(timeout)))
buf := make([]byte, len(s)+1)
copy(buf, s)
buf[len(s)] = '\n'
_, err := t.Write(buf)
checkErr(err)
}
func main() {
if len(os.Args) != 5 {
log.Printf("Usage: %s {unix|cisco} HOST:PORT USER PASSWD", os.Args[0])
return
}
typ, dst, user, passwd := os.Args[1], os.Args[2], os.Args[3], os.Args[4]
t, err := telnet.Dial("tcp", dst)
checkErr(err)
t.SetUnixWriteMode(true)
var data []byte
switch typ {
case "unix":
expect(t, "login: ")
sendln(t, user)
expect(t, "ssword: ")
sendln(t, passwd)
expect(t, "$")
sendln(t, "ls -l")
data, err = t.ReadBytes('$')
case "cisco":
expect(t, "name: ")
sendln(t, user)
expect(t, "ssword: ")
sendln(t, passwd)
expect(t, ">")
sendln(t, "sh ver")
data, err = t.ReadBytes('>')
default:
log.Fatalln("bad host type: " + typ)
}
checkErr(err)
os.Stdout.Write(data)
os.Stdout.WriteString("\n")
}
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