tclient

Simple telnet client lib, written in golang.

Some docs: https://godoc.org/github.com/ircop/tclient

Example usage:

main.go:

	client := tclient.New(5, "")
	err := client.Open("10.10.10.10", 23)
	if err != nil {
		panic(err)
	}
	defer client.Close()

	// you can omit this, or do auth stuff manually by calling `ReadUntil` with login/password prompts
	out, err := client.Login("script2", "pw3")
	if err != nil {
		panic(err)
	}
	fmt.Printf(out)

	out, err = client.Cmd("show time")
	if err != nil {
		panic(err)
	}
	fmt.Printf(out)

Output:

Matching callbacks

You can define regular expressions and callbacks that would be called when current output string will match one of regexps.

For example, we need to catch pagination on D-Link switch. Sample show switch paginated output:

There is no prompt, so app will stuck on this. So we need to catch something like CTRL+C ESC q Quit SPACE n Next Page ENTER Next Entry a All and send 'n' (next page) or 'a' (all pages). Like this:

	// matching "CTRL+C ESC q Quit SPACE n Next Page ENTER Next Entry a All"
	err = client.RegisterCallback(`(?msi:CTRL\+C.+?a A[Ll][Ll]\s*)`, func() {
		client.WriteRaw([]byte("a"))
	})
	if err != nil {
		panic(err)
	}

Note we are using WriteRaw(), not Write(), because Write() adds CRLF to given string.

TODO

Implement pagination parsing/manipulating (various network devices paging their output)

Implement parsing regexps with callbacks. For output pagination purposes, etc.