gistfile1.txt

#!/bin/sh
# This is a stripped-down script to connect to wpa networks on GNU/Linux systems

echo "* Connecting to the internet... "

if ps ax|awk '{print$5}'|grep -q 'wpa_supplicant'
then
	echo -n " - Killing previous wpa_supplicant... "
	if pkill wpa_supplicant; then
		echo "done."
	else
		echo "FAILED!"
		exit 1
	fi
fi
if ps ax|awk '{print$5}'|grep -q 'dhclient'
then
	echo -n " - Killing previous dhclient... "
	if pkill dhclient; then
		echo "done."
	else
		echo "FAILED!"
		exit 1
	fi
fi
if ps ax|awk '{print$5}'|grep -q 'dhcpcd'
then
	echo -n " - Killing previous dhcpcd... "
	if pkill dhclient; then
		echo "done."
	else
		echo "FAILED!"
		exit 1
	fi
fi

echo -n " - Bringing up wireless interface... "
WIRELESS_DEVICE=$(iwconfig 2>/dev/nulll | awk '/^wlan/{print$1;exit}')
ifconfig $WIRELESS_DEVICE up
sleep 1s
echo "done."

echo -n " - Detecting which SSID to connect to... "
SSIDS="osuwireless"
for POSSIBLE_SSID in $SSIDS; do
	if iwlist $WIRELESS_DEVICE scanning | grep "^\s*ESSID:\"$POSSIBLE_SSID\"" 1>/dev/null; then
		SSID=$POSSIBLE_SSID
	fi
done
if [ -z $SSID ]; then
	echo "\nNo recognized network found, aborting."
	return 1
else
	echo $SSID
fi

echo -n " - Starting wpa_supplicant... "
if [ -e /etc/wpa_supplicant/wpa_supplicant.log ]; then
	rm /etc/wpa_supplicant/wpa_supplicant.log
	touch /etc/wpa_supplicant/wpa_supplicant.log
fi
WPA_SUPPLICANT_CONF=/etc/wpa_supplicant.conf
wpa_supplicant -Dwext -i$WIRELESS_DEVICE -c$WPA_SUPPLICANT_CONF -B -f/etc/wpa_supplicant/wpa_supplicant.log
echo "done."

echo -n " - Waiting for association with access point"
while ! grep '^Associated with [0-9a-f][0-9a-f]:[0-9a-f][0-9a-f]:[0-9a-f][0-9a-f]:[0-9a-f][0-9a-f]:[0-9a-f][0-9a-f]:[0-9a-f][0-9a-f]' 1>/dev/null /etc/wpa_supplicant/wpa_supplicant.log; do
	echo -n "."
	sleep .2s
done
echo " done."

echo -n " - Getting IP address..."
if which dhclient >/dev/null
then
	if dhclient $WIRELESS_DEVICE $1
	then
		echo "done."
	else
		echo "FAILED!"
		exit 1
	fi
elif which dhcpcd >/dev/null
then
	if dhcpcd $WIRELESS_DEVICE $1
	then
		echo "done."
	else
		echo "FAILED!"
		exit 1
	fi
else
	echo "Unable to find dhcp client program (such as dhclient or dhcpcd), aborting"
fi
echo "+ Connected."