#! /bin/sh
### BEGIN INIT INFO
# Provides: dyna
# Required-Start:    $local_fs $syslog $remote_fs
# Required-Stop:     $local_fs $syslog $remote_fs
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Enable Tap and Bridge interfaces.
### END INIT INFO
#
#This script configure the machine to use br0 and specified tap interfaces
#original credits go to http://farfewertoes.com/.
#

. /lib/lsb/init-functions

# Are we running from init?
run_by_init() {
    ([ "$previous" ] && [ "$runlevel" ]) || [ "$runlevel" = S ]
}

################################################################################
# INITIAL CONFIGURATION
DYNADIR="/etc/dynamips"

export PATH="${PATH:+$PATH:}/bin:/usr/bin:/usr/sbin:/sbin"

if [ -f $DYNADIR/config ]; then
    . $DYNADIR/config
else
    echo "ERROR: $DYNADIR/config does not exist. Exiting."
    exit 1
fi


################################################################################
# FUNCTIONS


# Bring up the bridge interface
enable_bridge() {

    # Load the tun module
    if [ ! -e /dev/net/tun ]; then
        modprobe tun
    fi

    brctl addbr br0 || /bin/true

    # Disable $HOST_IF; host will use br0 instead
    #ip l s dev $HOST_IF down
    ip l s dev $HOST_IF up
    ifconfig $HOST_IF 0.0.0.0 promisc
    brctl addif br0 $HOST_IF

    # Bring up br0
    ip l s dev br0 up
if [ $HOST_SETUP = dhcp ]
 then
   	dhclient br0
else
    ip a a $HOST_IPADDR dev br0
    ip r a default via $HOST_GW
    fi

}

# Bring down the bridge interface
disable_bridge() {

    ifdown br0
    brctl delbr br0
    ifup $HOST_IF
}

# Activate tap interfaces
enable_taps() {

    for TAP in $TAPS; do
        # Check if $TAP is configured already
        ifconfig $TAP > /dev/null 2>&1
        if [ $? != 0 ]; then
            tunctl -t $TAP -u $DYNA_USER
            brctl addif br0 $TAP

            # Disable tap interfaces for host; guest will activate them for themselves
            ip l s dev $TAP up

            # Enable proxy_arp so that ARP requests can be answered correctly
            # by the host
            echo 1 > /proc/sys/net/ipv4/conf/$TAP/proxy_arp

        else
            log_failure_msg "Interface $TAP already configured"
        fi
    done
}

# Disable/deconfigure tap interfaces
disable_taps() {

    for TAP in $TAPS; do
        route del -host $HOST_IP dev $TAP
        brctl delif br0 $TAP
        tunctl -d $TAP
    done
}


################################################################################
# RUN
case "$1" in
    start)

                enable_bridge
                enable_taps

                chown $DYNA_USER.users /dev/net/tun
                chmod 0666 /dev/net/tun
		
   
        ;;
    stop)

            disable_taps
            disable_bridge

        ;;
    bridge-up)
        enable_bridge
        ;;
    bridge-down)
        disable_bridge
        ;;
    taps-up)
        enable_taps
        ;;
    taps-down)
        disable_taps
        ;;
    *)
        log_failure_msg "Usage: $0 {start|stop|bridge-up|bridge-down|taps-up|taps-down}"
        exit 3
esac

exit 0