Grab FreeBSD network settings

network_settings.sh

_check() {
    [ "$1" = "-echo" ] && shift && local _echo=1
	local _var="$1"
	local _msg="$2"
	local _default="$3"
	local _r
	if [ ${#_default} -gt 0 ]
	then
		read -p "${_msg} [${_default}]: " _r
	else
		read -p "${_msg}: " _r
	fi
	eval ${_var}=\"${_r:-${_default}}\"
	[ "${_echo}" = 1 ] && eval echo \$${_var}
}


_check HOSTNAME		"Hostname"		$(hostname)
_check EXT_IF 		"External Interface" 	$(route -n get -inet default | awk '/interface:/ { print $2 }')
_check IPV4 		"IPv4 Address" 		$(ifconfig $EXT_IF | awk '/inet[^6]/ { print $2; exit }')
_check IPV4_MASK	"IPv4 Netmask"		$(ifconfig $EXT_IF | awk '/inet[^6]/ { print $4; exit }')
_check IPV4_GW		"IPv4 Default Gateway" 	$(route -n get -inet default | awk '/gateway:/ { print $2 }')
_check IPV6		    "IPv6 Address"		$(ifconfig $EXT_IF | awk '/inet6/ { if ( substr($2,0,4) != "fe80" ) { print $2; exit } }')
_check IPV6_PREFIX	"IPv6 Prefix Length"	$(ifconfig $EXT_IF | awk '/inet6/ { if ( substr($2,0,4) != "fe80" ) { print $4; exit } }')
_check GATEWAYV6 	"IPv6 Default Gateway" 	$(route -n get -inet6 default | awk '/gateway:/ { print $2 }')

cat <<EOM
HOSTNAME : $HOSTNAME
EXT_IF : $EXT_IF
IPV4 : $IPV4
IPV4_MASK : $IPV4_MASK
IPV4_GW : $IPV4_GW
IPV6 : $IPV6
IPV6_PREFIX : $IPV6_PREFIX
GATEWAYV6 : $GATEWAYV6
EOM