A different angle towards telnet

[margaretjansen]

I'm happy to do the dev. just not sure this repo is really the latest...
So on the specific tab, you have the option to include a success login string. I know you can to nmap -sV and get detail, but that detail does not always reveal the exact string to expect.
How about adding a negative.
When you target a host, you know exactly what the denied message looks like. So having a negative response makes more sense to detect a failure. a pass would be anything that does not look like the failure message. I think this is a better way to deal with false positives.
Case in point... Chinese ipcams. They use some very custom busybox setups. success is not always just ~# or ~$
But the failure is always consistent.

[vanhauser-thc]

Initially the implementation was like that, but the issue is that packets get lost, timeouts occur, devices behave erratically etc and then final packet gets lost and a false positive is detected resulting in stop of the test.

If you want to implement it though go for it and I will merge the PR. It just should be optional, it cannot be the new default :)