#!/bin/sh
#============================================================================
# Author:  Fulup Ar Foll based on Xen original network bridge
# Debug:   ./fridu-in-axen.sh start brname=xen-br0 braddr=10.10.12.1 brmask=255.255.255.0
# Usage:   xend-config.sxp add following line
#          (network-script 'fridu-in-axen.sh brname=xen-br0 braddr=10.10.12.1 brmask=255.255.255.0')
# Bugs:    /etc/init.d/xend stop does not call the script
# Trace:   /var/log/xen/script.log
# ===========================================================================
#
#     users(default gw)         admin(10.0.0.0/16)
#    ----------------------    ------------------- 
#            |                          |
#   internet(eth0=82.12.4.1)      vpn(tun0=10.0.0.1) 
#            |                          |
#     firewall+nating              openvp+routing
#            +--------------------------+
#                          |
#                         QoS
#                    Port Forwarding
#                          |
#                 xen-bridge(10.0.1.1) 
#                    local dhcp+dns            
#            +-------------+------------+
#            |             |            |
#        10.0.1.2       10.0.1.3       10.0.1.4
#        Xen-VM-1       Xen-VM-2       Xen-VM3 
#   
#============================================================================


dir=$(dirname "$0")
. "$dir/xen-script-common.sh"
. "$dir/xen-network-common.sh"

findCommand   "$@"
evalVariables "$@"

brname=${brname:-xen-gw}
braddr=${braddr:-10.0.0.1}
brmask=${brmask:-255.255.255.0}

echo `date` $0 $* >>/var/log/xen/script.log

##
# link_exists interface
#
# Returns 0 if the interface named exists (whether up or down), 1 otherwise.
#
link_exists()
{
    if ip link show "$1" >/dev/null 2>/dev/null
    then
        return 0
    else
        return 1
    fi
}

# Usage: show_status dev brname
# Print ifconfig and routes.
show_status () {
    local dev=$1
    local brname=$2
    
    echo '============================================================'
    ip addr show ${dev}
    ip addr show ${brname}
    echo ' '
    brctl show ${brname}
    echo ' '
    ip route list
    echo ' '
    route -n
    echo '============================================================'
}

op_start () {
   # make sure routing is avaliable
   echo 1 >/proc/sys/net/ipv4/ip_forward

   if link_exists "$brname"; then
      if ifconfig "$brname" >/dev/null 2>/dev/null; then
      echo "ERROR brname=$brname already exist"
      exit 1  
   fi; fi

   # create our bridge setup IP/mask and no mask
   create_bridge ${brname}
   ifconfig ${brname} ${braddr} netmask ${brmask} 
    ip link set ${brname} arp on    
}

op_stop () {
    if ! link_exists "$brname"; then
        echo "ERROR: brname=$brname not found add brname=xxx option"
	return
    fi

    ip link set ${brname} down
    brctl delbr ${brname}
}

case "$command" in
    start)
	op_start
	;;
    
    stop)
	op_stop
	;;

    status)
	show_status ${netdev} ${brname}
	;;

    *)
	echo "ERROR syntax: $0 start|stop|status brname=xxx braddr=xx.xx.xx brmask=.... " >&2
	exit 1
esac