#!/bin/sh ################################################################################ # Binary programs used by this script. # ################################################################################ IFCONFIG=`which ifconfig` WICONTROL=`which wicontrol` DHCLIENT=`which dhclient` NETSTAT=`which netstat` ROUTE=`which route` DIALOG=`which dialog` KLDLOAD=`which kldload` KLDUNLOAD=`which kldunload` ################################################################################ # The network device name and the location of run-time storage. # ################################################################################ NETDEV="ndis0" DB_DIR="/var/run/wireless" ################################################################################ # Some parameters used for the User Interface. # ################################################################################ DLG_TITLE="Wireless Connection Manager" DLG_DIMENSIONS="20 50" ################################################################################ # Management of the Wireless Network Device. # # # # There are four possible options to run this script, they are listed below # # and parsed as a command line option. Finally, this script may ONLY be run # # as root, a regular user attempting to run this script will receive an error # # message. # ################################################################################ if [ `id -u` -ne "0" ]; then echo "ERROR: You appear to be `id -un` but you need to run this script as root" exit 1 fi ################################################################################ # Create the run-time storage directory if it doesn't exist. # ################################################################################ mkdir -p $DB_DIR ################################################################################ # wireless.sh start # # # # Called by the system during system start up. We load the if_ndis kernel # # module that will create the ndis? device. The device is created as being # # "down", it can be brough up by executing this script with the "connect" # # option. # ################################################################################ case "$1" in start) echo "Creating Wireless Network Device ($NETDEV)" $KLDLOAD if_ndis > /dev/null ;; ################################################################################ # wireless.sh connect # # # # The user wishes to bring up the wireless network device AND connect to a # # wireless network. We do the following: # # - Enable the wireless network device ndis? # # - Obtain a list of available access points. # # - Display the list and allow the user to make a selection of which access # # point to associate with. # # - If there are no access points, or the user cancels the selection, bring # # down the network device and exit. # # - Associate the network device to the selected Access Point. # # - Backup the existing /etc/resolv.conf file so it can be restored later. # # - Backup existing default route information so that it be later restored. # # - Run dhclient on the network device to obtain an IP address and set basic # # routing information. # # - Get all routes from the route table associated with the wireless network # # device and display them to the user. # ################################################################################ connect) INFO="Bringing up Wireless network device - $NETDEV...\n" $DIALOG --title "$DLG_TITLE" --infobox "$INFO" $DLG_DIMENSIONS $IFCONFIG $NETDEV up ############################################################################ INFO="$INFO\nScanning for available connection points" $DIALOG --title "$DLG_TITLE" --infobox "$INFO" $DLG_DIMENSIONS for NWID in `$WICONTROL -i $NETDEV -l | grep netname | awk '{print $4}' | sort | uniq` { MENULIST="$MENULIST $NWID Open_Wireless_Access_Point" } $DIALOG --title "$DLG_TITLE" \ --menu "Please select the Access Point you would like to attach to:" \ $DLG_DIMENSIONS 12 \ $MENULIST \ 2> tempfile ############################################################################ if [ $? -ne 0 ]; then $IFCONFIG $NETDEV down $DIALOG --title "$DLG_TITLE" \ --msgbox "No connection established, application terminated." $DLG_DIMENSIONS exit 0 fi ACCESS_POINT=`cat tempfile` ############################################################################ INFO="Connecting to Access Point - $ACCESS_POINT\n" $DIALOG --title "$DLG_TITLE" --infobox "$INFO" $DLG_DIMENSIONS $IFCONFIG $NETDEV nwid $ACCESS_POINT INFO="$INFO\n - Associated $NETDEV with $ACCESS_POINT" $DIALOG --title "$DLG_TITLE" --infobox "$INFO" $DLG_DIMENSIONS ############################################################################ cp /etc/resolv.conf $DB_DIR/resolv.conf INFO="$INFO\n - Backed up /etc/resolv.conf" $DIALOG --title "$DLG_TITLE" --infobox "$INFO" $DLG_DIMENSIONS ############################################################################ echo "default `route -n get default | awk '/gateway:/ { print $2 }'`" > $DB_DIR/def_route INFO="$INFO\n - Backed up route (`cat $DB_DIR/def_route`)" $DIALOG --title "$DLG_TITLE" --infobox "$INFO" $DLG_DIMENSIONS ############################################################################ $ROUTE delete default $DHCLIENT $NETDEV INFO="$INFO\n - DHCP negotiated on $NETDEV\n - Updating Routing table" $DIALOG --title "$DLG_TITLE" --infobox "$INFO" $DLG_DIMENSIONS ############################################################################ INFO="$INFO\n\nNew routes added" INFO="$INFO\n`$NETSTAT -nrf inet | grep $NETDEV | awk '{ print $1, $2 }'`\n" INFO="$INFO\nConnected! Press to continue" $DIALOG --title "$DLG_TITLE" --msgbox "$INFO" $DLG_DIMENSIONS ;; ################################################################################ # wireless.sh hangup # # # # - Kill the dhclient daemon running on the network device. # # - Delete all routes associated with the wireless network device. # # - Restore the original default route. # # - Restore the original /etc/resolv.conf # # - Unload and then reload the if_ndis kernel module, this clears any settings # # from the current session that may impact on future settings. # ################################################################################ hangup) INFO="Hanging up current wireless connection\n" if [ -e /var/run/dhclient.pid ]; then INFO="$INFO\n - Killing DHCP service" $DIALOG --title "$DLG_TITLE" --infobox "$INFO" $DLG_DIMENSIONS kill -9 `cat /var/run/dhclient.pid` fi ############################################################################ if [ -s $DB_DIR/def_route ]; then INFO="$INFO\n - Restoring route (`cat $DB_DIR/def_route`)" $DIALOG --title "$DLG_TITLE" --infobox "$INFO" $DLG_DIMENSIONS $ROUTE delete default > /dev/null 2>&1 $ROUTE add $(cat "$DB_DIR/def_route") fi ############################################################################ if [ -e $DB_DIR/resolv.conf ]; then INFO="$INFO\n - Restoring /etc/resolv.conf" $DIALOG --title "$DLG_TITLE" --infobox "$INFO" $DLG_DIMENSIONS rm /etc/resolv.conf mv /$DB_DIR/resolv.conf /etc/resolv.conf fi ############################################################################ rm -fR $DB_DIR/* ############################################################################ /sbin/kldunload if_ndis ;; ################################################################################ # wireless.sh hangup # # # # The system is going down, we need to restore some backed up information so # # that it is available the next time the system boots. Routing tables are not # # relevant and will be reset at next system boot time, however we need to: # # - Restore the original /etc/resolv.conf # # - Remove any database files from $DB_DIR # ################################################################################ stop) if [ -e $DB_DIR/resolv.conf ]; then echo "Restoring pre-Wireless Network Device system configuration files..." rm /etc/resolv.conf mv $DB_DIR/resolv.conf /etc/resolv.conf rm -fR $DB_DIR/* fi ;; ################################################################################ # Default case, print usage information for the shell script. # ################################################################################ *) echo "Usage: `basename $0` {start|stop|connect|hangup}" >&2 ;; esac exit 0