#!/bin/sh
# dhclient-script for Linux. Dan Halbert, March, 1997.
# Updated for Linux 2.[12] by Brian J. Murrell, January 1999.
# No guarantees about this. I'm a novice at the details of Linux
# networking.
# Pruned down for TiVo use, September 2001.  Enhanced to allow for
# use on 2.1.24 kernel, with pppd complexities, January 2002.
#

if [ x$new_broadcast_address != x ]; then
  new_broadcast_arg="broadcast $new_broadcast_address"
fi
if [ x$old_broadcast_address != x ]; then
  old_broadcast_arg="broadcast $old_broadcast_address"
fi
if [ x$new_subnet_mask != x ]; then
  new_subnet_arg="netmask $new_subnet_mask"
fi
if [ x$old_subnet_mask != x ]; then
  old_subnet_arg="netmask $old_subnet_mask"
fi
if [ x$alias_subnet_mask != x ]; then
  alias_subnet_arg="netmask $alias_subnet_mask"
fi

if [ x$reason = xMEDIUM ]; then
  # Linux doesn't do mediums (ok, ok, media).
  exit 0
fi

if [ x$reason = xPREINIT ]; then
  if [ x$alias_ip_address != x ]; then
    # Bring down alias interface. Its routes will disappear too.
    ifconfig $interface:0- inet 0
  fi
  ifconfig $interface inet 0.0.0.0 netmask 0.0.0.0 \
	broadcast 255.255.255.255 up
  # We need to give the kernel some time to get the interface up.
  sleep 1

  # Add routes to make broadcast work. Do not omit netmask.
  route.tivo add default dev $interface netmask 0.0.0.0
  route.tivo add -host 255.255.255.255 dev $interface
  route.tivo add -net 255.255.255.0 netmask 255.255.255.0 dev $interface

  sleep 1

  exit 0
fi

if [ x$reason = xARPCHECK ] || [ x$reason = xARPSEND ]; then
  exit 0
fi
  
if [ x$reason = xBOUND ] || [ x$reason = xRENEW ] || \
   [ x$reason = xREBIND ] || [ x$reason = xREBOOT ]; then
  if [ x$old_ip_address != x ] && [ x$alias_ip_address != x ] && \
		[ x$alias_ip_address != x$old_ip_address ]; then
    # Possible new alias. Remove old alias.
    ifconfig $interface:0- inet 0
  fi
  if [ x$old_ip_address != x ] && [ x$old_ip_address != x$new_ip_address ]; then
    # IP address changed. Bringing down the interface will delete all routes,
    # and clear the ARP cache.
    ifconfig $interface inet down

  fi
  if [ x$old_ip_address = x ] || [ x$old_ip_address != x$new_ip_address ] || \
     [ x$reason = xBOUND ] || [ x$reason = xREBOOT ]; then

    ifconfig $interface inet $new_ip_address $new_subnet_arg \
							$new_broadcast_arg
    # Add a network route to the computed network address.
    route.tivo add -net $new_network_number $new_subnet_arg dev $interface
    for router in $new_routers; do
      route.tivo add default gw $router
    done
  fi
  if [ x$reason = xREBIND ] && [ x$old_ip_address = x$new_ip_address ] && \
     ! grep -q ppp0: /proc/net/dev || ! ( route.tivo -n | grep -q ^0.0.0.0 ) ; then
     # We're renewing, same IP address, there's no default route, and PPP isn't
     # up.  pppd probably removed our previous default route.  Put it back.
     # I'd rather do this via route metrics but they aren't sufficiently well
     # supported in 2.1.24
    for router in $new_routers; do
      route.tivo add default gw $router netmask 0.0.0.0
    done
  fi
  if [ x$new_ip_address != x$alias_ip_address ] && [ x$alias_ip_address != x ];
   then
    ifconfig $interface:0- inet 0
    ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
    route.tivo add -host $alias_ip_address $interface:0
  fi
  exit 0
fi

if [ x$reason = xEXPIRE ] || [ x$reason = xFAIL ]; then
  if [ x$alias_ip_address != x ]; then
    # Turn off alias interface.
    ifconfig $interface:0- inet 0
  fi
  if [ x$old_ip_address != x ]; then
    # Shut down interface, which will delete routes and clear arp cache.
    ifconfig $interface inet down
    # Bring the interface back up and make it suitable for broadcasting
    # requests again, as if we were in PREINIT phase.
    sleep 1
    ifconfig $interface inet 0.0.0.0 netmask 0.0.0.0 \
         broadcast 255.255.255.255 up
    sleep 1
    route.tivo add default dev $interface netmask 0.0.0.0
    route.tivo add -host 255.255.255.255 dev $interface
    route.tivo add -net 255.255.255.0 netmask 255.255.255.0 dev $interface
    sleep 1
  fi
  if [ x$alias_ip_address != x ]; then
    ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
    route.tivo add -host $alias_ip_address $interface:0
  fi
  exit 0
fi

if [ x$reason = xTIMEOUT ]; then
  if [ x$alias_ip_address != x ]; then
    ifconfig $interface:0- inet 0
  fi
  ifconfig $interface inet $new_ip_address $new_subnet_arg \
					$new_broadcast_arg
  set $new_routers
  ############## what is -w in ping?
  if ping -q -c 1 $1; then
    if [ x$new_ip_address != x$alias_ip_address ] && \
			[ x$alias_ip_address != x ]; then
      ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
      route.tivo add -host $alias_ip_address dev $interface:0
    fi
    route.tivo add -net $new_network_number
    for router in $new_routers; do
      route.tivo add default gw $router
    done
    exit 0
  fi
  ifconfig $interface inet down
  # Bring the interface back up and make it suitable for broadcasting
  # requests again, as if we were in PREINIT phase.
  sleep 1
  ifconfig $interface inet 0.0.0.0 netmask 0.0.0.0 \
         broadcast 255.255.255.255 up
  sleep 1
  route.tivo add default dev $interface netmask 0.0.0.0
  route.tivo add -host 255.255.255.255 dev $interface
  route.tivo add -net 255.255.255.0 netmask 255.255.255.0 dev $interface
  sleep 1
  exit 1
fi

exit 0