Golang custom timeout solution

Question

I need to create a custom timeout solution for ssh.Dial. I tried setting the timeout in the sshConfig, but it just doesn't work sometimes which causes the whole program to hang.

connection, err := ssh.Dial("tcp", "X.X.X.X:22", sshConfig)

In some cases it times out, it works in other cases. But it stumbles on specific IPs and doesn't do anything. It just hangs the entire program.

So how would I go about coding "my own" timeout solution for this line of code?

instead of using ssh.Dial use DialTimeout e.g :- listener, err := net.DialTimeout("tcp", "192.xxx.x.xxx:8899", 10*time.Second) if err != nil { fmt.Printf("connection error ", err.Error()) } DialTimeout acts like Dial but takes a timeout. — negi Yogi
– negi Yogi, Commented Jan 2, 2018 at 6:48
I am curious at what makes the code hang. Would you please provide some more info on the situation? — leaf bebop
– leaf bebop, Commented Jan 2, 2018 at 9:24

dustinevan · Accepted Answer · 2018-01-02 06:27:23Z

1

It looks like the config takes a timeout. See: https://godoc.org/golang.org/x/crypto/ssh#ClientConfig

in other words:

conn, err := ssh.Dail("tcp", "X.X.X.X:22", ssh.ClientConfig{Timeout: time.Second * 4})

answered Jan 2, 2018 at 6:27

dustinevan

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1 Comment

Jack Johnson Over a year ago

It takes a timeout. It just doesn't respect it and will hang on some IPs indefinitely.

Jack Johnson · Accepted Answer · 2018-01-01 22:29:55Z

0

Did this and it worked:

    c1 := make(chan bool, 1)
    go RunRequest(element, authInfo, c1)
    select {
        case <-c1:
        case <-time.After(time.Second * 4):
    }

The ssh.Dial was inside the RunRequest GoRoutine.

answered Jan 1, 2018 at 22:29

Jack Johnson

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2 Comments

Mr_Pink Over a year ago

That doesn't timeout anything, and just leaves the hanging function running indefinitely, which may or may not be tying up system resources.

Mr_Pink Over a year ago

But it’s not “timing out” RunRequest if it’s blocked, it leaves it blocked indefinitely. If the timeout isn’t working, figure what’s blocked rather than ignoring it.

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