Check Telnet port for correct response

[HolgerAusB]

⚠️ Please verify that this feature request has NOT been suggested before.

• [X] I checked and didn't find similar feature request

🏷️ Feature Request Type

New Monitor

🔖 Feature description

Inspired by #9 and the wish of @choffmeister of monitoring a Teamspeak server, I would sugguest to implement a telnet monitor. Teamspeak servers have a telnet interface, standardport is 10011.

If Kuma would support monitoring via telnet protocol, that would be great. In addition, we should be able to specify a comparison pattern that is compared with the response of the server.

Maybe the expect-package is helpful?

✔️ Solution

call a server via telnet port an compare the answer with a pattern

❓ Alternatives

One could use a variant of my script (via cron job) to set an mqtt-topic if telnet does not show the greeting-message. And then use the new mqtt-Monitor in Kuma (currently in pre-release 1.15.0-beta.0).

📝 Additional Context

No response

[Computroniks]

This would be a nice feature to have but I am not sure about its applications other than for TeamSpeak as you suggest. I am also not sure how widely telnet is used as a monitoring system anymore due to it being overtaken by systems such as SSH in terms of security. Do you perhaps have any other use cases for this monitor type?

[HolgerAusB]

I don't know about other systems. But as it is a low security protocol, I think it could be easy to build a monitor. I might be wrong about that point.

• try a connection to telnet server
• do we get a connection?
• do we get a response / greeting message / (login) prompt and does this message match with a pattern?
• in this simple case, no need for credentials to send via telnet

maybe same monitor works for SSH or similar protocols too?

[augustgerro]

Telnet us totally unsecured protocols, many companies disabled it long time ago. It seems to me that monitoring for SSH is a higher priority