wlanangel.sh

#!/usr/bin/env bash
IFUP="/sbin/ifup"
IFDN="/sbin/ifdown"
PING="/bin/ping"
WLAN="wlan0"
PNGA="-c 1 -I $WLAN -W 1"
PNGT="94.23.194.120"
PNGF="8.8.8.8"
PNGR="192.168.0.1"
ITRA=0

function do_ping () {
	tgt=$1
	$PING $PNGA $tgt >/dev/null 2>&1
	if [ $? -eq 0 ]; then return 0; else return 1; fi
}
function do_chk () {
	do_ping $PNGT && return 0
	do_ping $PNGF && return 0
	do_ping $PNGR && echo "No internet connectivity, but local connectivity seems to work." && return 0
	return 1
}
do_chk && exit
for ((;;)); do
	echo "Cycling $WLAN..."
	$IFDN $WLAN
	sleep 5
	$IFUP $WLAN
	sleep 5
	do_chk && break
	ITRA=$(($ITRA+1))
	if [ $ITRA -gt 2 ]; then
		echo "Looped three times, giving up."
		break
	fi
done