Telnet, my Telnet - Or macOS High Sierra, what have you done ?

This harks back to a VERY old post: -

Testing Times with Telnet

which was penned back in 2010.

Since I've upgraded to macOS High Sierra, I've lost the FTP and Telnet clients.

Ordinarily that wouldn't be a problem but ….

Telnet is often useful for testing ports e.g. telnet localhost 9443.

Thankfully, we have a solution …. Netcat.

Q: Checking TCP/UDP ports!

nc -vnzu 127.0.0.1 9080

found 0 associations

found 1 connections:

     1: flags=82<CONNECTED,PREFERRED>

outif (null)

src 127.0.0.1 port 59595

dst 127.0.0.1 port 9080

rank info not available

Connection to 127.0.0.1 port 9080 [udp/*] succeeded!

nc -vnzu 127.0.0.1 9443

found 0 associations

found 1 connections:

     1: flags=82<CONNECTED,PREFERRED>

outif (null)

src 127.0.0.1 port 54459

dst 127.0.0.1 port 9443

rank info not available

Connection to 127.0.0.1 port 9443 [udp/*] succeeded!

etc.

So it's a bit more fiddly !

So I hacked a solution !

alias 

alias hist='history | cut -c 8-'
alias telnet='nc -vnzu'

So now I can run: -

telnet 127.0.0.1 8443

found 0 associations

found 1 connections:

     1: flags=82<CONNECTED,PREFERRED>

outif (null)

src 127.0.0.1 port 52157

dst 127.0.0.1 port 8443

rank info not available

Connection to 127.0.0.1 port 8443 [udp/*] succeeded!

Bazinga!