#!/bin/sh

# /etc/rc.conf:
#
# ifwi=YES
# ifwi_list="ath0" # wireless NICs you have onboard, white-space separated
#
# setup differents wireless ids with corresponding NICs
# in the following example, ath0 with id "work"
# please note id is NOT the ssid but an id of your choice
#
# ifwi_ath0_work="inet 192.168.0.200/24 chan 11 ssid \"work wi\" media \
# DS11 mode 11b nwkey 0x0102030405"
# 
# another link, with id "home"
#
# ifwi_ath0_home="inet 192.168.2.2/24 chan 6 ssid \"home wi\" mediaopt \
# adhoc mode 11b"
#
# ifwi_ath0_friend="chan 6 ssid \"somewhere\" -nwkey"
#
# define default routes corresponding to id's
#
# router_ath0_home="192.168.2.1"
# router_ath0_work="192.168.0.254"
#
# start dhclient for this id
#
# dhcp_ath0_friend="YES" 
#
# usage
#
# ifwi start home # will start with home id
# ifwi show # show availables APs
# ifwi start downtown # scan availables APs and up on any matching AP ssid,
#                     # for example, here ifwi will match on downtown2,
#                     # "the downtown", ...
#                     # IP / routing / dhclient call must be done manually
# ifwi stop # ifconfig down every listed wireless interface
#
# comments / patches: <imil@gcu.info>

id=$2

. /etc/rc.subr

name="ifwi"
rcvar=$name
extra_commands="show"
start_cmd="${name}_start"
stop_cmd="${name}_stop"
show_cmd="${name}_show"

# override rc.subr classic rc_usage() as we need additionnal parameter
rc_usage()
{
	echo "Usage: $0 (start <network id | ssid pattern> | stop | show)"
	exit 1
}

getval()
{
	value=`echo $ap | awk -F"$key" '{print $2}' | \
			sed -e 's/\ *\].*//' -e 's/.*\[\ *//'`
}

ifwi_scan()
{
	out=`wiconfig $if -D`

	# extract first matching AP from AP list
	ap=`echo $out | sed 's/.*\([^B]SSID.*${id}.*\)/\1/'`

	if [ -n "$ap" ]; then
		key=SSID; getval; ssid=$value
		key=Channel; getval; channel=$value
	else
		echo "no matching ap"
	fi
}

ifwi_start()
{
	if [ -z $ifwi_list ]; then
		echo "no \$ifwi_list parameter set"
		exit 1
	fi

	if [ -z "$id" ]; then
		usage
	fi

	for if in $ifwi_list; do
		# interface setup
		eval args=\$ifwi_${if}_${id}
		if [ -n "$args" ]; then
			# there was an ifwi_<iface>_<ssid> def in rc.conf
			ifconfig_args="$if $args"
		else
			# no def, scan for a network matching argument
			ifwi_scan
			if [ -z "$ssid" ] && [ -z "$channel" ]; then
				echo "no ap found"
				exit 1
			fi
			ifconfig_args="$if inet ssid \"$ssid\" chan $channel -nwkey"
		fi

		echo "[$name] running ifconfig $ifconfig_args"
		eval "ifconfig $ifconfig_args up"

		eval args=\$dhcp_${if}_${id}
		if [ -n "$args" ] && checkyesno args; then
			eval "dhclient $if"
		else
			# route setup
			eval args=\$router_${if}_${id}
			if [ -n "$args" ]; then
				# delete previous default route if any
				route delete default > /dev/null 2>&1
				route add default $args > /dev/null 2>&1
				echo "[$name] default route set to $args"
			fi
		fi # dhcp

	done
}

ifwi_stop()
{
	for if in $ifwi_list; do
		ifconfig $if down
		echo "[$name] shutting $if"
	done
}

ifwi_show()
{
	for if in $ifwi_list; do
		echo "[$name] access points list for $if"
		wiconfig $if -D
	done
}

load_rc_config $name
run_rc_command "$1"