Handle custom netmask for JAIL_IP

[cfunkhouser]

It was recently necessary for me to set a /16 for a JAIL_IP. This makes that possible.

Default behavior is maintained. New option is documented.

[danb35]

validating the value, it has to be between 1-32 so if 0 or 33+

Is a netmask of less than 8 bits (i.e., larger than a class A network) even valid?

[PrivatePuffin]

Another option would be to allow adding /16 to the JAIL_IP And just splitting it in the script, defaulting to /24 if no subnet is added.

I think that is a way better user experience

[danb35]

And just splitting it in the script, defaulting to /24 if no subnet is added.

I think I like this idea better, and will start working on it unless the PR is updated to do it first.

[PrivatePuffin]

@danb35 From the top of my head you could do this:

JAIL_IP=*ENTER IP With or Without Mask*
NETMASK=${JAIL_IP%*/}
JAIL_IP=${JAIL_IP%/*}

[danb35]

That looks cleaner than what I came up with:

IP=$(echo ${JAIL_IP} | cut -f1 -d/)
NETMASK=$(echo ${JAIL_IP} | cut -f2 -d/)
if [ "${NETMASK}" = "${IP}" ]
then
  NETMASK="24"
fi

[danb35]

Addressed with the above commit.