git.maemo.org Git - mtetherd/blob - tethering.sh

   1 #!/bin/sh
   2 #
   3 # /usr/bin/tethering.sh
   4 #
   5 # Enable tethering on USB network and Bluetooth PAN.
   6 #
   7 # Note that the INETDEV must be up and running when this script is
   8 # started, or forwarding will not be enabled.
   9 # Having tethering on multiple devices concurrently is possible,
  10 # but forwarding will be disabled once the first device disconnetcs.
  11 # A better check is necessary.
  12 #
  13 # Put this into /etc/dbus-scripts/tethering :
  14 # /usr/bin/tethering.sh * * org.freedesktop.Hal.Manager DeviceAdded
  15 # /usr/bin/tethering.sh * * org.freedesktop.Hal.Manager DeviceRemoved
  16 #
  17 # dbus-scripts doesn't give us the event path, so we have to use a more
  18 # convoluted method of getting the network interface.
  19 #
  20
  21 EVENT="$4"
  22 UDI="$5"
  23 HALDEV="$(echo $UDI | sed 's#.*/\([0-9a-zA-Z_]*\)#\1#')"
  24 LOG="/tmp/tethering.log"
  25 INETDEV="gprs0"
  26 RUNFILE="/var/run/tethering.$HALDEV.pid"
  27 IFACEFILE="/var/run/tethering.$HALDEV.iface"
  28
  29 if [ "$EVENT" = "DeviceAdded" ]; then
  30         IFACE=$(hal-get-property --udi $UDI --key net.interface)
  31         case $IFACE in
  32                 bnep0 )
  33                         IF_ADDRESS=192.168.254.254
  34                         IF_RANGE=192.168.254.1,192.168.254.254
  35                 ;;
  36                 usb0 )
  37                         IF_ADDRESS=192.168.253.254
  38                         IF_RANGE=192.168.253.1,192.168.253.254
  39                 ;;
  40                 * )
  41                         exit 0
  42                 ;;
  43         esac
  44
  45         echo "$(date) Enabling tethering on interface $IFACE" >> $LOG
  46         echo "$IFACE" > $IFACEFILE
  47         ifconfig "$IFACE" "$IF_ADDRESS"
  48         /sbin/modprobe ipt_MASQUERADE
  49         /usr/sbin/iptables -t nat -A POSTROUTING -o $INETDEV -j MASQUERADE
  50         /usr/sbin/start-stop-daemon -S -p "$RUNFILE" -b -x /usr/sbin/dnsmasq -- -x "$RUNFILE" -k -I lo -i "$IFACE" -a $IF_ADDRESS -z -F $IF_RANGE,3600
  51         echo 1 > /proc/sys/net/ipv4/conf/$IFACE/forwarding
  52         echo 1 > /proc/sys/net/ipv4/conf/$INETDEV/forwarding
  53 fi
  54
  55 if [ "$EVENT" = "DeviceRemoved" ]; then
  56         if [ ! -f "$IFACEFILE" ]; then
  57                 exit 0
  58         fi
  59         IFACE="$(cat $IFACEFILE)"
  60         rm "$IFACEFILE"
  61         echo "$(date) Disabling tethering on device $IFACE" >> $LOG
  62         echo 0 > /proc/sys/net/ipv4/conf/$INETDEV/forwarding
  63         /usr/sbin/start-stop-daemon -K -p "$RUNFILE" -x /usr/sbin/dnsmasq
  64         /usr/sbin/iptables -t nat -D POSTROUTING -o $INETDEV -j MASQUERADE
  65 fi
  66
  67 exit 0