OSX CherryTech SSH BMIT alias

.bash_profile_vpn

# Check if the VPN is connected
# @param $1 vpn name
function _vpn_connected
{
	scutil --nc status "$1" | head -n 1 | grep -q Connected
}

# Wait up to 20 seconds for VPN connection
# @param $1 vpn name
function _vpn_poll_until_connected
{
	# 200 * 0.1 is 20 seconds (bash doesn't support floats)
	declare -r max_loops=200
	local loops=0

	while ! _vpn_connected "$1"; do
		sleep 0.1
		((++loops > max_loops)) && break
	done

	((loops <= max_loops))
}

# SSH alias to connect to BMIT VPN if needed
# @param $1 host
function alias_vpn_ssh
{
	declare -r vpn="CherryTech BMIT"
	local host=$1

	# check if host is in bmit (hosts lookup)
	if grep -q "10\\.250\\.1.*$host" /etc/hosts; then
		# check if vpn is not connected
		if ! _vpn_connected "$vpn"; then
			# try to connect, and wait until it is connected
			scutil --nc start "$vpn"

			if ! _vpn_poll_until_connected "$vpn"; then
				echo "Couldn't connect to VPN."
				scutil --nc stop "$vpn"
				return 1
			fi
		fi
	fi

	# forward all arguments to ssh
	ssh $@
}
alias ssh=alias_vpn_ssh