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-rw-r--r--recipes-connectivity/dhcp/files/dhclient-exit-hooks95
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diff --git a/recipes-connectivity/dhcp/files/dhclient-exit-hooks b/recipes-connectivity/dhcp/files/dhclient-exit-hooks
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-#!/bin/bash
-#
-# /etc/dhcp/dhclient-exit-hooks
-#
-# This file is sourced by /sbin/dhclient-script.
-#
-# dhcp option 121 is defined in RFC3442. The following is the link.
-# http://www.ietf.org/rfc/rfc3442.txt
-#
-# The code for this option is 121, and its minimum length is 5 bytes.
-# This option can contain one or more static routes, each of which
-# consists of a destination descriptor and the IP address of the router
-# that should be used to reach that destination.
-#
-# Code Len Destination 1 Router 1
-# +-----+---+----+-----+----+----+----+----+----+
-# | 121 | n | d1 | ... | dN | r1 | r2 | r3 | r4 |
-# +-----+---+----+-----+----+----+----+----+----+
-#
-# Destination 2 Router 2
-# +----+-----+----+----+----+----+----+
-# | d1 | ... | dN | r1 | r2 | r3 | r4 |
-# +----+-----+----+----+----+----+----+
-#
-# In the above example, two static routes are specified.
-#
-# The following table contains some examples of how various subnet
-# number/mask combinations can be encoded:
-#
-# Subnet number Subnet mask Destination descriptor
-# 0 0 0
-# 10.0.0.0 255.0.0.0 8.10
-# 10.0.0.0 255.255.255.0 24.10.0.0
-# 10.17.0.0 255.255.0.0 16.10.17
-# 10.27.129.0 255.255.255.0 24.10.27.129
-# 10.229.0.128 255.255.255.128 25.10.229.0.128
-# 10.198.122.47 255.255.255.255 32.10.198.122.47
-#
-# For metadata service, the following is a valid route from nova-api that
-# the VM instance can uses to retrieve metadata.
-#
-# 32 169 254 169 254 128 224 149 201
-#
-# In the above example, mask length of destination descriptor is always 32,
-# destination is always "169.254.169.254", and the gateway is a valid IP address.
-#
-# The add_routes function takes an array of unsigned integer 8, separated by spaces,
-# parse them, and added each of the routes into routing table.
-#
-
-function add_routes() {
-while [ $# -ne 0 ]; do
- mask=$1
- shift
-
- # Parse the arguments into a CIDR net/mask string
- if [ $mask -eq 32 ]; then
- destination="-host $1.$2.$3.$4"
- shift; shift; shift; shift
- elif [ $mask -gt 24 ]; then
- destination="-net $1.$2.$3.$4/$mask"
- shift; shift; shift; shift
- elif [ $mask -gt 16 ]; then
- destination="-net $1.$2.$3.0/$mask"
- shift; shift; shift
- elif [ $mask -gt 8 ]; then
- destination="-net $1.$2.0.0/$mask"
- shift; shift
- #Add the default route
- elif [ $mask -eq 0 ]; then
- destination="default"
- else
- destination="-net $1.0.0.0/$mask"
- shift
- fi
-
- # Read the gateway
- gateway="$1.$2.$3.$4"
- shift; shift; shift; shift
-
- # Add route into routing table
- route add $destination gw $gateway
-
- # Print it out if the route is added successfully
- if [ $? = 0 ]; then
- echo "Added route \"$destination gw $gateway\""
- fi
-done
-}
-
-# Call add_routes to add routes
-if [ "x$new_classless_static_routes" != x ]; then
- add_routes $new_classless_static_routes
-fi
-