golang ssh拨号超时

Question

What is the best way to create DialTimeout on ssh connection? For example, this code always returns "Ping deadline exceed":

func (t *Tunnel) ping(sshConn *ssh.Client, addr string) (net.Conn, error) {
    var (
        conn net.Conn
        err  error
        done chan int
    )
    go func() {
        time.Sleep(getSeconds(10))
        err = errors.New("Ping deadline exceed")
        log.Printf("%v
Status: bad %s -> %s", err, t.serverAddr, addr)
        t.writeStatus(bad)
        done <- 1
        close(done)
    }()
    go func() {
        conn, err = sshConn.Dial("tcp", addr)
        if err != nil {
            t.writeStatus(bad)
            log.Printf("%v
Status: bad %s -> %s", err, t.serverAddr, addr)
        }
        done <- 1
        close(done)
    }()
    <-done
    return conn, err
}

PS Timeout in ssh.ClientConfig is set to 5 seconds

Answer 1

Instead of using sshConn.Dial take a look at:

func DialTimeout(network, address string, timeout time.Duration) (Conn, error)

From the connection docs:

DialTimeout acts like Dial but takes a timeout. The timeout includes name resolution, if required.