#!/bin/sh
#
# This is a very simple demo of wpa_supplicant for WPA2 security.
# This creates a wpa_supplicant.conf file and starts the
# wpa_supplicant daemon to serve it. This is intended to be a quick
# and dirty tool. This script will find and kill any running instances
# of NetworkManager, dhclient, and wpa_supplicant. There may be other
# running daemons and agents that could interfere with this script.
#
# Copyright (c) 2010, Noah Spurrier <noah@noah.org>
# You may use this under the "ISC License":
#   http://opensource.org/licenses/isc-license.txt
#

TARGET_SSID=$1
PASSWORD=$2
IWFACE=$3

# Check if user is permitted to use this script.
NETDEV_GROUP_ID=$(grep -i netdev /etc/group | cut -d: -f 3 )
if (id -u | grep -q 0) || (id -G | grep -q ${NETDEV_GROUP_ID}); then
    echo "You must be root or in the 'netdev' group to use this."
    exit 1
fi

if [ $# -lt 3 ]; then
    echo "$0 [target_SSID] [password] [interface]"
    exit 1
fi

killall -s INT wpa_supplicant
sleep 1
if killall -s INT wpa_supplicant ; then
    echo "Cannot kill wpa_supplicant."
    echo "Try starting with `sudo`."
    echo "Try `etc/init.d/NetworkManager stop`"
fi

ifconfig ${IWFACE} down
sleep 2
(echo "ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev"; \
    wpa_passphrase "${TARGET_SSID}" "${PASSWORD}" | \
    grep -v \#psk | sed '/ssid/a \\tscan_ssid=1') > "wpa_${TARGET_SSID}.conf"

sleep 2
chmod 600 "wpa_${TARGET_SSID}.conf"
ifconfig ${IWFACE} up
sleep 2
ifconfig ${IWFACE} up
wpa_supplicant -B -D wext -c "wpa_${TARGET_SSID}.conf" -i ${IWFACE} -f /var/log/wpa_supplicant.log
sleep 2
dhclient ${IWFACE}

#
# License:
#
# 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.
#
# vim:set sr et ts=4 sw=4 ft=sh: // See Vim, :help 'modeline'