samwiseetc/network/if-pre-up.d/wireless-tools

#!/bin/sh

IWCONFIG=/sbin/iwconfig

if [ ! -x $IWCONFIG ]; then
  exit 0
fi

# check if this is a 802.11 device we're supposed to be effecting
case "${IF_WIRELESS:-enable}" in
	wireless-tools|iwconfig)
		# *we* and not some other 802.11 tool should be used
	;;
	true|yes|enable|1)
		# 802.11 should be used on this device, check for extensions
		$IWCONFIG $IFACE >/dev/null 2>&1 || exit 0
	;;
	*)
		exit 0
	;;
esac

# The wireless driver madness:
#
# - Some drivers want everything to be configured before bringing the interface up
# - Some drivers want everything to be configured after bringing the interface up
# - Some drivers want some parameters before, other parameters after bringing the interface up
#
# So, we try to set every parameter when the interface is still down,
# and remember which ones failed to be configured properly.
# If some failed, we bring the interface up, and try the failed ones again.

apply_settings()
{
	if [ -n "$IF_WIRELESS_SENS" ]; then
		$IWCONFIG "$IFACE" sens $IF_WIRELESS_SENS && IF_WIRELESS_SENS= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_MODE" ]; then
		$IWCONFIG "$IFACE" mode $IF_WIRELESS_MODE && IF_WIRELESS_MODE= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_AP" ]; then
		$IWCONFIG "$IFACE" ap $IF_WIRELESS_AP && IF_WIRELESS_AP= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_RATE" ]; then
		$IWCONFIG "$IFACE" rate $IF_WIRELESS_RATE && IF_WIRELESS_RATE= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_RTS" ]; then
		$IWCONFIG "$IFACE" rts $IF_WIRELESS_RTS && IF_WIRELESS_RTS= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_FRAG" ]; then
		$IWCONFIG "$IFACE" frag $IF_WIRELESS_FRAG && IF_WIRELESS_FRAG= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_POWER" ]; then
		$IWCONFIG "$IFACE" power $IF_WIRELESS_POWER && IF_WIRELESS_POWER= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_POWERPERIOD" ]; then
		$IWCONFIG "$IFACE" power period $IF_WIRELESS_POWERPERIOD && IF_WIRELESS_POWERPERIOD= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_POWERTIMEOUT" ]; then
		$IWCONFIG "$IFACE" power timeout $IF_WIRELESS_POWERTIMEOUT && IF_WIRELESS_POWERTIMEOUT= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_TXPOWER" ]; then
		$IWCONFIG "$IFACE" txpower $IF_WIRELESS_TXPOWER && IF_WIRELESS_TXPOWER= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_RETRY" ]; then
		$IWCONFIG "$IFACE" retry $IF_WIRELESS_RETRY && IF_WIRELESS_RETRY= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_ENC" ]; then
		eval $IWCONFIG "$IFACE" enc $IF_WIRELESS_ENC && IF_WIRELESS_ENC= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_DEFAULTKEY" ]; then
		$IWCONFIG "$IFACE" key ["$IF_WIRELESS_DEFAULTKEY"] && IF_WIRELESS_DEFAULTKEY= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_KEYMODE" ]; then
		$IWCONFIG "$IFACE" key "$IF_WIRELESS_KEYMODE" && IF_WIRELESS_KEYMODE= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_KEY" ]; then
		eval $IWCONFIG "$IFACE" key $IF_WIRELESS_KEY && IF_WIRELESS_KEY= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_KEY1" ]; then
		$IWCONFIG "$IFACE" key [1] "$IF_WIRELESS_KEY1" && IF_WIRELESS_KEY1= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_KEY2" ]; then
		$IWCONFIG "$IFACE" key [2] "$IF_WIRELESS_KEY2" && IF_WIRELESS_KEY2= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_KEY3" ]; then
		$IWCONFIG "$IFACE" key [3] "$IF_WIRELESS_KEY3" && IF_WIRELESS_KEY3= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_KEY4" ]; then
		$IWCONFIG "$IFACE" key [4] "$IF_WIRELESS_KEY4" && IF_WIRELESS_KEY4= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_FREQ" ]; then
		$IWCONFIG "$IFACE" freq $IF_WIRELESS_FREQ && IF_WIRELESS_FREQ= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_CHANNEL" ]; then
		$IWCONFIG "$IFACE" channel $IF_WIRELESS_CHANNEL && IF_WIRELESS_CHANNEL= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_NICK" ]; then
		$IWCONFIG "$IFACE" nick "$IF_WIRELESS_NICK" && IF_WIRELESS_NICK= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_NWID" ]; then
		$IWCONFIG "$IFACE" nwid "$IF_WIRELESS_NWID" && IF_WIRELESS_NWID= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_ESSID" ]; then
		$IWCONFIG "$IFACE" essid "$IF_WIRELESS_ESSID" && IF_WIRELESS_ESSID= || FAIL=true
	fi

	if [ -n "$IF_WIRELESS_COMMIT" ]; then
		$IWCONFIG "$IFACE" commit && IF_WIRELESS_COMMIT= || FAIL=true
	fi
}

FAIL=
apply_settings 2>/dev/null

if [ -n "$FAIL" ]; then
	FAIL=
	/sbin/ip link set dev "$IFACE" up
	apply_settings
fi