CLI client: change the first arg to a MAC address

[ioistired]

I'd like my switch presence service to connect to my switch regardless of what network my laptop and Switch are on. I see the GUI now defaults to this so it would be nice if the CLI client did as well.

[gabehxd]

One issue with this is the current way we get out MAC address. It is only compatible with windows afaik but there probably is a more cross platform function.

[gabehxd]

cc: @cathery maybe you have some ideas

[cathery]

Windows version launches arp internally to get all mac addresses. if that's not compatible with linux i guess you should look for a different solution?

[ioistired]

There is an equivalent command for *nix called "arp-scan". arp-scan --localnet --plain outputs one line per host in the format IP<TAB>MAC address<TAB>Vendor name.
To use that we'd obviously require arp-scan as a runtime dependency (it's not installed by default). The trickier problem is that arp-scan typically requires root access (or the setuid bit).