#!/bin/bash

#if [ -x /usr/bin/logger ]; then
#	LOGGER="/usr/bin/logger -s -p user.notice -t dhclient"
#else
	LOGGER=/bin/echo
#fi

make_resolv_conf() {
  if [ "x$new_domain_name" != x ] || [ x"$new_domain_name_servers" != x ]; then
    >/etc/resolv.conf
    if [ "x$new_domain_name" != x ]; then
      $LOGGER search $new_domain_name >/etc/resolv.conf
    fi
    if [ "x$new_domain_name_servers" != x ]; then
      for nameserver in $new_domain_name_servers; do
        $LOGGER nameserver $nameserver >>/etc/resolv.conf
      done
    fi
  fi
}

# Must be used on exit.   Invokes the local dhcp client exit hooks, if any.
exit_with_hooks() {
  exit_status=$1
#  if [ -f /etc/dhclient-exit-hooks ]; then
#    . /etc/dhclient-exit-hooks
#  fi
# probably should do something with exit status of the local script
  exit $exit_status
}

# Invoke the local dhcp client enter hooks, if they exist.
if [ -f /etc/dhclient-enter-hooks ]; then
  exit_status=0
#  . /etc/dhclient-enter-hooks
  # allow the local script to abort processing of this state
  # local script must set exit_status variable to nonzero.
#  if [ $exit_status -ne 0 ]; then
#    exit $exit_status
#  fi
fi

if [ x$new_network_number != x ]; then
   $LOGGER New Network Number: $new_network_number
fi

if [ x$new_broadcast_address != x ]; then
 $LOGGER New Broadcast Address: $new_broadcast_address
  new_broadcast_arg="broadaddr $new_broadcast_address"
fi
if [ x$old_broadcast_address != x ]; then
  old_broadcast_arg="broadaddr $old_broadcast_address"
fi
if [ x$new_subnet_mask != x ]; then
  new_netmask_arg="netmask $new_subnet_mask"
fi
if [ x$old_subnet_mask != x ]; then
  old_netmask_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
  eval "/bin/ifconfig $interface $medium"
  eval "/bin/ifconfig $interface addr -alias 0.0.0.0 $medium" >/dev/null 2>&1
  sleep 1
  exit_with_hooks 0
fi

if [ x$reason = xPREINIT ]; then
  if [ x$alias_ip_address != x ]; then
    /bin/ifconfig $interface addr -alias $alias_ip_address > /dev/null 2>&1
    /bin/route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
  fi
  /bin/ifconfig $interface addr 0.0.0.0 netmask 0.0.0.0 \
		broadaddr 255.255.255.255 up
  exit_with_hooks 0
fi

if [ x$reason = xARPCHECK ] || [ x$reason = xARPSEND ]; then
  exit_with_hooks 0;
fi
  
if [ x$reason = xBOUND ] || [ x$reason = xRENEW ] || \
   [ x$reason = xREBIND ] || [ x$reason = xREBOOT ]; then

#  if [ -n "$new_nis_domain" ]; then
#    domainname "$new_nis_domain"

#    rm -f /etc/yp.conf
#    if [ -n "$new_nis_servers" ]; then
#      for I in $new_nis_servers; do
#        echo "domain $new_nis_domain server $I" >> /etc/yp.conf
#      done
#    else
#      echo "domain $new_nis_domain broadcast" >> /etc/yp.conf
#    fi
#  elif [ -n "$new_nis_servers" ]; then
#    rm -f /etc/yp.conf
#    for I in $new_nis_servers; do
#      echo "ypserver $I" >> /etc/yp.conf
#    done
#  fi
  
#  if [ -n "$new_ntp_servers" ]; then
#    cat <<EOF > /etc/ntp.conf
#restrict default ignore
#restrict 127.0.0.1
#driftfile /etc/ntp/drift
#broadcastdelay 0.008
#authenticate yes
#keys /etc/ntp/keys
#EOF
#    :> /etc/ntp/step-tickers
#    for I in $new_ntp_servers; do
#      echo "server $I" >> /etc/ntp.conf
#      echo "$I" >> /etc/ntp/step-tickers
#    done
#  fi

#  current_hostname=`hostname`
#  if [ x$current_hostname = x ] || \
#     [ x$current_hostname = x$old_host_name ]; then
#    if [ x$current_hostname = x ] || \
#       [ x$new_host_name != x$old_host_name ]; then
#      $LOGGER "New Hostname: $new_host_name"
#      hostname $new_host_name
#    fi
#  fi
  if [ x$old_ip_address != x ] && [ x$alias_ip_address != x ] && \
		[ x$alias_ip_address != x$old_ip_address ]; then
    /bin/ifconfig $interface addr -alias $alias_ip_address > /dev/null 2>&1
    /bin/route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
  fi
  if [ x$old_ip_address != x ] && [ x$old_ip_address != x$new_ip_address ]
   then
    eval "/bin/ifconfig $interface addr -alias $old_ip_address $medium"
    /bin/route delete $old_ip_address 127.1 >/dev/null 2>&1
    for router in $old_routers; do
      /bin/route delete default $router >/dev/null 2>&1
    done
    if [ "$old_static_routes" != "" ]; then
      set -- $old_static_routes
      while [ $# -gt 1 ]; do
	/bin/route delete $1 $2
	shift; shift
      done
    fi
    arp -n -a | sed -n -e 's/^.*(\(.*\)) at .*$/arp -d \1/p' |sh
  fi
  if [ x$old_ip_address = x ] || [ x$old_ip_address != x$new_ip_address ] || \
     [ x$reason = xBOUND ] || [ x$reason = xREBOOT ]; then
    eval "/bin/ifconfig $interface addr $new_ip_address $new_netmask_arg \
					$new_broadcast_arg $medium"
    $LOGGER "New IP Address($interface): $new_ip_address"
    $LOGGER "New Subnet Mask($interface): $new_subnet_mask"
    $LOGGER "New Broadcast Address($interface): $new_broadcast_address"
    if [ "$new_routers" != "" ]; then
      $LOGGER "New Routers: $new_routers"
    fi
    /bin/route add $new_ip_address 127.1 >/dev/null 2>&1
    for router in $new_routers; do
      /bin/route add default $interface gw $router >/dev/null 2>&1
    done
    if [ "$new_static_routes" != "" ]; then
      $LOGGER "New Static Routes: $new_static_routes"
      set -- $new_static_routes
      while [ $# -gt 1 ]; do
	/bin/route add $1 $2
	shift; shift
      done
    fi
  fi
  if [ x$new_ip_address != x$alias_ip_address ] && [ x$alias_ip_address != x ];
   then
    /bin/ifconfig $interface addr alias $alias_ip_address $alias_subnet_arg
    /bin/route add $alias_ip_address 127.0.0.1
  fi
  make_resolv_conf
  exit_with_hooks 0
fi

if [ x$reason = xEXPIRE ] || [ x$reason = xFAIL ] || [ x$reason = xRELEASE ] \
   || [ x$reason = xSTOP ]; then
  if [ x$alias_ip_address != x ]; then
    /bin/ifconfig $interface addr -alias $alias_ip_address > /dev/null 2>&1
    /bin/route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
  fi
  if [ x$old_ip_address != x ]; then
    eval "/bin/ifconfig $interface addr -alias $old_ip_address $medium"
    /bin/route delete $old_ip_address 127.1 >/dev/null 2>&1
    for router in $old_routers; do
      /bin/route delete default $router >/dev/null 2>&1
    done
    if [ "$old_static_routes" != "" ]; then
      set -- $old_static_routes
      while [ $# -gt 1 ]; do
	/bin/route delete $1 $2
	shift; shift
      done
    fi
    arp -n -a | sed -n -e 's/^.*(\(.*\)) at .*$/arp -n -d \1/p' \
						|sh >/dev/null 2>&1
  fi
  if [ x$alias_ip_address != x ]; then
    /bin/ifconfig $interface addr alias $alias_ip_address $alias_subnet_arg
    /bin/route add $alias_ip_address 127.0.0.1
  fi
  exit_with_hooks 0
fi

if [ x$reason = xTIMEOUT ]; then
  if [ x$alias_ip_address != x ]; then
    /bin/ifconfig $interface addr -alias $alias_ip_address > /dev/null 2>&1
    /bin/route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
  fi
  eval "/bin/ifconfig $interface addr $new_ip_address $new_netmask_arg \
					$new_broadcast_arg $medium"
  $LOGGER "New IP Address($interface): $new_ip_address"
  $LOGGER "New Subnet Mask($interface): $new_subnet_mask"
  $LOGGER "New Broadcast Address($interface): $new_broadcast_address"
  sleep 1
  if [ "$new_routers" != "" ]; then
    $LOGGER "New Routers: $new_routers"
    set -- $new_routers
    if ping -q -c 1 $1; then
      if [ x$new_ip_address != x$alias_ip_address ] && \
			[ x$alias_ip_address != x ]; then
	/bin/ifconfig $interface addr alias $alias_ip_address $alias_subnet_arg
	/bin/route add $alias_ip_address 127.0.0.1
      fi
      /bin/route add $new_ip_address 127.1 >/dev/null 2>&1
      for router in $new_routers; do
	/bin/route add default $interface gw $router >/dev/null 2>&1
      done
      set -- $new_static_routes
      while [ $# -gt 1 ]; do
	/bin/route add $1 $2
	shift; shift
      done
      make_resolv_conf
      exit_with_hooks 0
    fi
  fi
  eval "/bin/ifconfig $interface addr -alias $new_ip_address $medium"
  for router in $old_routers; do
    /bin/route delete default $router >/dev/null 2>&1
  done
  if [ "$old_static_routes" != "" ]; then
    set -- $old_static_routes
    while [ $# -gt 1 ]; do
      /bin/route delete $1 $2
      shift; shift
    done
  fi
  arp -n -a | sed -n -e 's/^.*(\(.*\)) at .*$/arp -d \1/p' \
							|sh >/dev/null 2>&1
  exit_with_hooks 1
fi

exit_with_hooks 0