#!/bin/sh
# Filename:      grml-ap
# Purpose:       set up access point on your box
# Authors:       grml-team (grml.org), (c) Michael Prokop <mika@grml.org>
# Bug-Reports:   see http://grml.org/bugs/
# License:       This file is licensed under the GPL v2.
# Latest change: Mit Okt 11 23:00:43 CEST 2006 [moemoe]
################################################################################

# exit on any error
set -e

CONFIG_FILE=/etc/grml/routersetup
. /etc/grml/lsb-functions
. /etc/grml/net-functions
. /etc/grml/script-functions

check4root

if ! [ -r "$CONFIG_FILE" ] ; then
        eerror "$CONFIG_FILE could not be read."
        exit 1
fi

. "$CONFIG_FILE"

[ -n "$AP_ESSID" ] || AP_ESSID=grml-ap
[ -n "$AP_ENC" ]   || AP_ENC=off

info_message() {
        DEV="$1"
        echo $1 | grep -q wlan && DEV=$(echo $1 | sed 's/wlan/wifi/')
        einfo "Finished setting up access point. Make sure your device $DEV is configured:"
        einfo "For example put the following into /etc/network/interfaces and run \"ifup $DEV=ap\""
        echo "
iface ap inet static
      address 192.168.10.1
      netmask 255.255.255.0
      network 192.168.10.0
      broadcast 192.168.10.255
"
        einfo "On the client side put the following into /etc/network/interfaces and run \"ifup \$DEV=ap\""
        echo "
iface ap inet static
      address 192.168.10.2
      netmask 255.255.255.0
      network 192.168.10.0
      broadcast 192.168.10.255
      gateway 192.168.10.1
      wireless_essid $AP_ESSID
"
}

set_ath_mode() {
        eindent
          einfo "Setting $1 to mode $2"
          iwpriv $1 mode $2 ; eend $?
        eoutdent
}

setupWifiDevice() {
        DEV=$1
        einfo "Setting wireless modes on $DEV"
        
          eindent
          einfo "Setting sid to: $AP_ESSID"
          iwconfig $DEV essid $AP_ESSID ; eend $?

          [ "$AP_ENC" = off ] && ENC_INFO='off' || ENC_INFO='******'
          einfo "Settinc encrypton to: $ENC_INFO "
          iwconfig $DEV enc $AP_ENC ; eend $?

          einfo "Setting device up"
          ifconfig $DEV up ; eend $?

        eoutdent
}

setup_atheros() {
        einfo "Atheros setup: creating new WLAN AP device"

        # ugly but don't know of another workaround
        if iwconfig 2>/dev/null | grep -A1 ath0 | grep -q 'Access Point: Not-Associated' ; then
          einfo "Destroying old ath device"
          wlanconfig ath0 destroy ; eend $?
        fi

        device=$(wlanconfig ath create wlandev $1 wlanmode ap)
        eend $?
        
        setupWifiDevice $device
        [ -n "$ATH_MODE" ] && set_ath_mode "$device" "$ATH_MODE"

        info_message $device
        exit 0
}

setup_hostap() {
        einfo "Hostap setup: creating new WLAN AP device"
        eindent

          # einfo "Changing mode of $1 to AP"
          # ifconfig $1 down ; eend $?
  
          # dunno if the card is pci or pcmcia, just try to unload and
          # load both versions,
          [ -n $(lsmod | grep ^orinoco_pci) ] && HAPT="pci"
          [ -n $(lsmod | grep ^orinoco_cs) ]  && HAPT="cs"
          [ -n $(lsmod | grep ^orinoco_plx) ] && HAPT="plx"

          einfo "Unloading old modules"
          modprobe -r orinoco orinoco_$HAPT
          eend $?

          einfo "Loading new modules"
          modprobe hostap_$HAPT
          eend $? && setupWifiDevice $1

        eoutdent

        info_message $1
        exit 0
}

setup_iwconfig() {
        einfo "Trying to set $1 into mode master"
        ifconfig $1 down
        iwconfig $1 mode master
        eend $? && setupWifiDevice $1
        exit 0
}

setup_generic() {
        einfo "Generic setup (no hostap / atheros capable device found): creating new WLAN AP device"
        echo "TODO! iwconfig $1 mode Ad-Hoc"
        exit 0
}

detect_wl_cards() {
        # If you want to extend this with a specific funtion for a
        # special driver, please have a look at /etc/grml/net-functions
        for i in $AP_DEVICE $(getWlanDevices) ; do
                DRIVER=$(getLanDriver $i)
                case $DRIVER in
                  ath_pci)
                       echo $i | grep -q ath && i=$(echo $i | sed 's/ath/wifi/')
                       setup_atheros $i
                       ;;
                  orinoco|hostap)
                       setup_hostap $i
                       ;;
                  ipw2100|prism54)
                       setup_iwconfig $i
                       ;;
                  *)
                       setup_generic $i
                       ;;
                esac
        done
}

stop_devices() {
  einfo "Searching for WLAN device with ESSID $AP_ESSID"
  DEVICE=$(iwconfig 2>/dev/null| grep "ESSID:\"$AP_ESSID\"" | awk '{print $1}')
  eindent
  if [ -n "$DEVICE" ] ; then
     for i in $DEVICE ; do
       einfo "Found device $i" ; eend 0
     done
  else
     eerror "No device(s) with ESSID $AP_ESSID found"
     exit 1
  fi
  case $DEVICE in
      ath*)
        einfo "Shutting down $DEVICE"
        ifdown $DEVICE
        wlanconfig $DEVICE destroy ; eend $?
        exit 0
        ;;
      *)
        for i in $DEVICE ; do
          einfo "Shutting down $i"
          ifdown $i ; eend $?
        done
        exit 0
        ;;
  esac
  eoutdent
}

case "$1" in
    start)
       detect_wl_cards
       ;;
    stop)
       einfo "Trying to stop all present grml-ap setups"
       stop_devices
       ;;
    restart)
       $0 stop
       sleep 1:
       $0 start
       ;;
    *)
    echo "Usage: $0 {start|stop|restart}"
    exit 1
    ;;
esac

eerror "Your wlan card is not supported at the moment. Sorry" ; eend 1
exit 1

## END OF FILE #################################################################
# vim: ft=sh expandtab ai