wlan autoconnection skripts

#!/bin/sh

# Author:       kamikaze
# Contact:      [email protected]

#
# Please read the comments in /usr/local/etc/rc.d/wi.sh if you
# require documentation.
#

# The desired action.
command=$1

# The error number to return.
error=0

# The characters wireless network names may consist of.
netname_chars="aAbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPqQrRsStTuUvVwWxXyYzZ0123456789"

# The path for the network init scripts.
network_scripts="/etc/wi.conf"

# Network profile.
network_profile="/var/run/wi"

# Scan results.
network_scan="/var/run/networks"

# Default settings.
wi_enable="NO"
wi_module=""
wi_device=""
wi_loadfirmware=""

# Get settings from rc.conf.
. /etc/rc.subr

name="wi"
rcvar=`set_rcvar`

load_rc_config $name

# Check if the wi service is enabled.
if [ "$wi_enable" = "NO" ]; then
        echo "wi_$command:	The wi service is not enabled."
        exit 1
fi

# Check if a device has been defined.
if [ "$wi_device" = "" ]; then
	echo "wi_$command:	No device has been configured for the wiinit service."
	exit 1
fi

wi_start()
{
	if [ "$wi_module" ]; then
		# Check if the wireless device module is loaded.
		/sbin/kldstat -n $wi_module 2> /dev/null > /dev/null
		if [ $? -eq 1 ]; then
			echo "wi_$command:	Load kernel module for wireless network device."
			/sbin/kldload $wi_module 2> /dev/null > /dev/null
			$wi_loadfirmware
		fi
	fi

	# Find networks.
	echo "wi_$command:	Searching for wireless networks."
	/sbin/ifconfig $wi_device up
	/usr/sbin/wicontrol $wi_device -L > /dev/null
	networks=$(/usr/sbin/wicontrol $wi_device -l | grep netname | grep -Eo "[$netname_chars]+" | grep -v SSID | grep -v netname)

	# Save scan results.
	echo "$networks" > $network_scan

	# Practically wicontrol returns networks
	# in the order of their signal quality.
	for network in $networks; do
		script=$(cat "$network_scripts/$network" 2> /dev/null)
		if [ $? -eq 0 ]; then
			echo "wi_$command:	Run init script for $network."
			echo "$script" | /bin/sh
			if [ $? -eq 1 ]; then
				echo "wi_$command:	Init script $network failed."
				continue
			else
				echo "wi_$command:	Done."
				echo $network > $network_profile
				exit $error
			fi
		fi
	done

	# Check weather any networks have been found.
	if [ "$networks" = "" ]; then
		echo "wi_$command:	No wireless networks have been found."
	fi

	# Finding a network did not succeed.
	error=1
	eval wi_stop
}

wi_stop()
{
	# Get the current profile.
	network=$(cat $network_profile 2> /dev/null)

	if [ $? -eq 0 ]; then
		script=$(cat $network_scripts/$network_stop 2> /dev/null)
		if [ $? -eq 0 ]; then
			echo "wi_$command:	Run deactivation script for $network."
			echo "$script" | /bin/sh
		fi
	fi

	echo "wi_$command:	Terminate dhclient sessions on $wi_device."
	/sbin/dhclient -r $wi_device

	# Check if the device is running and shut it down.
	/sbin/ifconfig $wi_device | grep UP | grep RUNNING 2> /dev/null > /dev/null
	if [ $? -eq 0 ]; then
		echo "wi_$command:	Shuting down $wi_device."
		/sbin/ifconfig $wi_device down
	fi

	# Check if the kernel module is loaded and unload it.
	/sbin/kldstat -n $wi_module 2> /dev/null > /dev/null
	if [ $? -eq 0 ]; then
		echo "wi_$command:	Unloading $wi_module kernel module."
		/sbin/kldunload $wi_module
	fi

	# Remove the profile record.
	/bin/rm $network_profile 2> /dev/null > /dev/null

	# Terminate program.
	exit $ERROR
}

wi_status()
{
	# Check weather a wireless network is configured.
	network=$(cat /var/run/wi 2> /dev/null)
	
	if [ $? -eq 1 ]; then
		echo "wi_$command:	Not connected."
	else
		echo "wi_$command:	profile: $network"
		status=$(/sbin/ifconfig $wi_device | grep status)
		echo "wi_$command:$status"
	fi

	echo "wi_$command:	Available networks:"
	cat $network_scan 2> /dev/null

	exit $error
}

# Run desired command.
wi_$command