#!/bin/sh
#
################################################################################
#
# Copyright (c) 2016-2017, Bryan Vyhmeister <bryan@bsdjournal.net>
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
# OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
# PERFORMANCE OF THIS SOFTWARE.
#
################################################################################
#
# Title: cell-setup
# Version: 0.6.0
#
################################################################################
#
# This script is designed to setup an LTE umb(4) connection and then, 
# when it comes online, add a default route and the carrier provided 
# DNS server.
#
################################################################################
#
# Set the APN variable to the proper variable for your provider.
# 'broadband' is the correct value for AT&T Wireless in the United States.

APN="broadband"

################################################################################


f_cell_activate() {
	ifconfig umb0 class LTE apn ${APN} up
	sleep 1
}

f_cell_status() {
	_CELL_STATUS=""
	_CELL_STATUS=`ifconfig umb0 | grep status | awk '{ print $2 }'`
	if [ "${_CELL_STATUS}" == "active" ]; then
		CELL_STATUS=0
	else
		CELL_STATUS=1
	fi
	return ${CELL_STATUS}
}

f_set_route() {
	CELL_ROUTE=`ifconfig umb0 | grep inet | awk '{ print $2 }'`
	route add -ifp umb0 default ${CELL_ROUTE}
	if [ $? == 0 ]; then
		echo "Default route added"
	else
		echo "Default route failure"
	fi
}

f_set_dns() {
	CELL_DNS=`ifconfig umb0 | grep dns | awk '{ print $2 }'`
	if [ "${CELL_DNS}" == "" ]; then
		echo "Failure"
	else
		echo "nameserver ${CELL_DNS}" > /etc/resolv.conf
		echo "lookup file bind" >> /etc/resolv.conf
	fi
}

f_cell_activate
while true ; do
	f_cell_status
	if [ $? == 0 ]; then
		f_set_route
		f_set_dns
		break
	fi
done