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name : ifupdown.sh
 #!/bin/sh

#####################################################################
## Purpose
# This file is executed by ifupdown in pre-up, post-up, pre-down and
# post-down phases of network interface configuration. It allows
# ifup(8), and ifdown(8) to manage wpa_supplicant(8) and wpa_cli(8)
# processes running in daemon mode.
#
# /etc/wpa_supplicant/functions.sh is sourced by this file.
#
# This file is provided by the wpasupplicant package.

#####################################################################
# Copyright (C) 2006 - 2009 Debian/Ubuntu wpasupplicant Maintainers 
# <pkg-wpa-devel@lists.alioth.debian.org>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# On Debian GNU/Linux systems, the text of the GPL license,
# version 2, can be found in /usr/share/common-licenses/GPL-2.

if [ -n "$IF_WPA_MAINT_DEBUG" ]; then
	set -x
fi

# quit if we're called for the loopback
if [ "$IFACE" = lo ]; then
	exit 0
fi

# allow wpa_supplicant interface to be specified via wpa-iface
# useful for starting wpa_supplicant on one interface of a bridge
if [ -n "$IF_WPA_IFACE" ]; then
	WPA_IFACE="$IF_WPA_IFACE"
else
	WPA_IFACE="$IFACE"
fi

# source functions
if [ -f /etc/wpa_supplicant/functions.sh ]; then
	. /etc/wpa_supplicant/functions.sh
else
	exit 0
fi

# quit if executables are not installed
if [ ! -x "$WPA_SUP_BIN" ] || [ ! -x "$WPA_CLI_BIN" ]; then
	exit 0
fi

do_start () {
	if test_wpa_cli; then
		# if wpa_action is active for this IFACE, do nothing
		ifupdown_locked && exit 0

		# if the administrator is calling ifup, say something useful
		if [ "$PHASE" = "pre-up" ]; then
			wpa_msg stderr "wpa_action is managing ifup/ifdown state of $WPA_IFACE"
			wpa_msg stderr "execute \`ifdown --force $WPA_IFACE' to stop wpa_action"
		fi
		exit 1
	elif ! set | grep -q "^IF_WPA"; then
		# no wpa- option defined for IFACE, do nothing
		exit 0
	fi

	# ensure stale ifupdown_lock marker is purged
	ifupdown_unlock

	# preliminary sanity checks for roaming daemon
	if [ -n "$IF_WPA_ROAM" ]; then
		if [ "$METHOD" != "manual" ]; then
			wpa_msg stderr "wpa-roam can only be used with the \"manual\" inet METHOD"
			exit 1
		fi
		if [ -n "$IF_WPA_MAPPING_SCRIPT" ]; then
			if ! type "$IF_WPA_MAPPING_SCRIPT" >/dev/null; then
				wpa_msg stderr "wpa-mapping-script \"$IF_WPA_MAPPING_SCRIPT\" is not valid"
				exit 1
			fi
		fi
		if [ -n "$IF_WPA_MAPPING_SCRIPT_PRIORITY" ] && [ -z "$IF_WPA_MAPPING_SCRIPT" ]; then
			wpa_msg stderr "\"wpa-mapping-script-priority 1\" is invalid without a wpa-mapping-script"
			exit 1
		fi
		IF_WPA_CONF="$IF_WPA_ROAM"
		WPA_ACTION_SCRIPT="/sbin/wpa_action"
	fi

	# master function; determines if ifupdown.sh should do something or not
	if [ -n "$IF_WPA_CONF" ] && [ "$IF_WPA_CONF" != "managed" ]; then
		if [ ! -s "$IF_WPA_CONF" ]; then
			wpa_msg stderr "cannot read contents of $IF_WPA_CONF"
			exit 1
		fi	
		WPA_SUP_CONF_CTRL_DIR=$(sed -n -e 's/[[:space:]]*#.*//g' -e 's/[[:space:]]\+.*$//g' \
			-e 's/^ctrl_interface=\(DIR=\)\?\(.*\)/\2/p' "$IF_WPA_CONF")
		if [ -n "$WPA_SUP_CONF_CTRL_DIR" ]; then
			WPA_CTRL_DIR="$WPA_SUP_CONF_CTRL_DIR"
			WPA_SUP_CONF="-c $IF_WPA_CONF"
		else
			# specify the default ctrl_interface since none was defined in
			# the given IF_WPA_CONF
			WPA_SUP_CONF="-c $IF_WPA_CONF -C $WPA_CTRL_DIR"
		fi
	else
		# specify the default ctrl_interface
		WPA_SUP_CONF="-C $WPA_CTRL_DIR"
	fi
}

do_stop () {
	if test_wpa_cli; then
		# if wpa_action is active for this IFACE and calling ifdown,
		# do nothing
		ifupdown_locked && exit 0
	elif test_wpa_supplicant; then
		# wpa_supplicant process exists for this IFACE, but wpa_cli
		# process does not. Allow stop mode to kill this process.
		:
	else
		exit 0
	fi
}

case "$MODE" in 
	start)
		do_start
		case "$PHASE" in
			pre-up)
				kill_wpa_supplicant
				init_wpa_supplicant	|| exit 1
				conf_wpa_supplicant 	|| { kill_wpa_supplicant; exit 1; }
				;;
			post-up)
				init_wpa_cli 		|| { kill_wpa_supplicant; exit 1; }
				;;
		esac
		;;

	stop)
		do_stop
		case "$PHASE" in
			pre-down)
				kill_wpa_cli
				;;
			post-down)
				kill_wpa_supplicant
				;;
			*)
				wpa_msg stderr "unknown phase: \"$PHASE\""
				exit 1
				;;
		esac
		;;
	
	*)
		wpa_msg stderr "unknown mode: \"$MODE\""
		exit 1
		;;
esac

exit 0
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