Commandes DHCP
Le tableau suivant présente les commandes prévues pour gérer le protocole DHCP sur votre réseau.
Tableau 18–1 Commandes utilisées dans DHCP
Exécution des commandes DHCP au sein de scripts
Les commandes dhcpconfig, dhtadm et pntadm sont optimisées pour les scripts. La commande pntadm est notamment utile pour créer un grand nombre d'entrées d'adresses IP dans une table de réseau DHCP. L'exemple de script suivant utilise la commande pntadm en mode de traitement par lots pour générer des adresses IP.
Exemple 18–1 Script addclient.ksh avec la commande pntadm
#! /usr/bin/ksh
#
# This script utilizes the pntadm batch facility to add client entries
# to a DHCP network table. It assumes that the user has the rights to
# run pntadm to add entries to DHCP network tables.
#
# Based on the nsswitch setting, query the netmasks table for a netmask.
# Accepts one argument, a dotted IP address.
#
get_netmask()
{
MTMP=`getent netmasks ${1} | awk '{ print $2 }'`
if [ ! -z "${MTMP}" ]
then
print - ${MTMP}
fi
}
#
# Based on the network specification, determine whether or not network is
# subnetted or supernetted.
# Given a dotted IP network number, convert it to the default class
# network.(used to detect subnetting). Requires one argument, the
# network number. (e.g. 10.0.0.0) Echos the default network and default
# mask for success, null if error.
#
get_default_class()
{
NN01=${1%%.*}
tmp=${1#*.}
NN02=${tmp%%.*}
tmp=${tmp#*.}
NN03=${tmp%%.*}
tmp=${tmp#*.}
NN04=${tmp%%.*}
RETNET=""
RETMASK=""
typeset -i16 ONE=10#${1%%.*}
typeset -i10 X=$((${ONE}&16#f0))
if [ ${X} -eq 224 ]
then
# Multicast
typeset -i10 TMP=$((${ONE}&16#f0))
RETNET="${TMP}.0.0.0"
RETMASK="240.0.0.0"
fi
typeset -i10 X=$((${ONE}&16#80))
if [ -z "${RETNET}" -a ${X} -eq 0 ]
then
# Class A
RETNET="${NN01}.0.0.0"
RETMASK="255.0.0.0"
fi
typeset -i10 X=$((${ONE}&16#c0))
if [ -z "${RETNET}" -a ${X} -eq 128 ]
then
# Class B
RETNET="${NN01}.${NN02}.0.0"
RETMASK="255.255.0.0"
fi
typeset -i10 X=$((${ONE}&16#e0))
if [ -z "${RETNET}" -a ${X} -eq 192 ]
then
# Class C
RETNET="${NN01}.${NN02}.${NN03}.0"
RETMASK="255.255.255.0"
fi
print - ${RETNET} ${RETMASK}
unset NNO1 NNO2 NNO3 NNO4 RETNET RETMASK X ONE
}
#
# Given a dotted form of an IP address, convert it to its hex equivalent.
#
convert_dotted_to_hex()
{
typeset -i10 one=${1%%.*}
typeset -i16 one=${one}
typeset -Z2 one=${one}
tmp=${1#*.}
typeset -i10 two=${tmp%%.*}
typeset -i16 two=${two}
typeset -Z2 two=${two}
tmp=${tmp#*.}
typeset -i10 three=${tmp%%.*}
typeset -i16 three=${three}
typeset -Z2 three=${three}
tmp=${tmp#*.}
typeset -i10 four=${tmp%%.*}
typeset -i16 four=${four}
typeset -Z2 four=${four}
hex=`print - ${one}${two}${three}${four} | sed -e 's/#/0/g'`
print - 16#${hex}
unset one two three four tmp
}
#
# Generate an IP address given the network address, mask, increment.
#
get_addr()
{
typeset -i16 net=`convert_dotted_to_hex ${1}`
typeset -i16 mask=`convert_dotted_to_hex ${2}`
typeset -i16 incr=10#${3}
# Maximum legal value - invert the mask, add to net.
typeset -i16 mhosts=~${mask}
typeset -i16 maxnet=${net}+${mhosts}
# Add the incr value.
let net=${net}+${incr}
if [ $((${net} < ${maxnet})) -eq 1 ]
then
typeset -i16 a=${net}\&16#ff000000
typeset -i10 a="${a}>>24"
typeset -i16 b=${net}\&16#ff0000
typeset -i10 b="${b}>>16"
typeset -i16 c=${net}\&16#ff00
typeset -i10 c="${c}>>8"
typeset -i10 d=${net}\&16#ff
print - "${a}.${b}.${c}.${d}"
fi
unset net mask incr mhosts maxnet a b c d
}
# Given a network address and client address, return the index.
client_index()
{
typeset -i NNO1=${1%%.*}
tmp=${1#*.}
typeset -i NNO2=${tmp%%.*}
tmp=${tmp#*.}
typeset -i NNO3=${tmp%%.*}
tmp=${tmp#*.}
typeset -i NNO4=${tmp%%.*}
typeset -i16 NNF1
let NNF1=${NNO1}
typeset -i16 NNF2
let NNF2=${NNO2}
typeset -i16 NNF3
let NNF3=${NNO3}
typeset -i16 NNF4
let NNF4=${NNO4}
typeset +i16 NNF1
typeset +i16 NNF2
typeset +i16 NNF3
typeset +i16 NNF4
NNF1=${NNF1#16\#}
NNF2=${NNF2#16\#}
NNF3=${NNF3#16\#}
NNF4=${NNF4#16\#}
if [ ${#NNF1} -eq 1 ]
then
NNF1="0${NNF1}"
fi
if [ ${#NNF2} -eq 1 ]
then
NNF2="0${NNF2}"
fi
if [ ${#NNF3} -eq 1 ]
then
NNF3="0${NNF3}"
fi
if [ ${#NNF4} -eq 1 ]
then
NNF4="0${NNF4}"
fi
typeset -i16 NN
let NN=16#${NNF1}${NNF2}${NNF3}${NNF4}
unset NNF1 NNF2 NNF3 NNF4
typeset -i NNO1=${2%%.*}
tmp=${2#*.}
typeset -i NNO2=${tmp%%.*}
tmp=${tmp#*.}
typeset -i NNO3=${tmp%%.*}
tmp=${tmp#*.}
typeset -i NNO4=${tmp%%.*}
typeset -i16 NNF1
let NNF1=${NNO1}
typeset -i16 NNF2
let NNF2=${NNO2}
typeset -i16 NNF3
let NNF3=${NNO3}
typeset -i16 NNF4
let NNF4=${NNO4}
typeset +i16 NNF1
typeset +i16 NNF2
typeset +i16 NNF3
typeset +i16 NNF4
NNF1=${NNF1#16\#}
NNF2=${NNF2#16\#}
NNF3=${NNF3#16\#}
NNF4=${NNF4#16\#}
if [ ${#NNF1} -eq 1 ]
then
NNF1="0${NNF1}"
fi
if [ ${#NNF2} -eq 1 ]
then
NNF2="0${NNF2}"
fi
if [ ${#NNF3} -eq 1 ]
then
NNF3="0${NNF3}"
fi
if [ ${#NNF4} -eq 1 ]
then
NNF4="0${NNF4}"
fi
typeset -i16 NC
let NC=16#${NNF1}${NNF2}${NNF3}${NNF4}
typeset -i10 ANS
let ANS=${NC}-${NN}
print - $ANS
}
#
# Check usage.
#
if [ "$#" != 3 ]
then
print "This script is used to add client entries to a DHCP network"
print "table by utilizing the pntadm batch facilty.\n"
print "usage: $0 network start_ip entries\n"
print "where: network is the IP address of the network"
print " start_ip is the starting IP address \n"
print " entries is the number of the entries to add\n"
print "example: $0 10.148.174.0 10.148.174.1 254\n"
return
fi
#
# Use input arguments to set script variables.
#
NETWORK=$1
START_IP=$2
typeset -i STRTNUM=`client_index ${NETWORK} ${START_IP}`
let ENDNUM=${STRTNUM}+$3
let ENTRYNUM=${STRTNUM}
BATCHFILE=/tmp/batchfile.$$
MACRO=`uname -n`
#
# Check if mask in netmasks table. First try
# for network address as given, in case VLSM
# is in use.
#
NETMASK=`get_netmask ${NETWORK}`
if [ -z "${NETMASK}" ]
then
get_default_class ${NETWORK} | read DEFNET DEFMASK
# use the default.
if [ "${DEFNET}" != "${NETWORK}" ]
then
# likely subnetted/supernetted.
print - "\n\n###\tWarning\t###\n"
print - "Network ${NETWORK} is netmasked, but no entry was found \n
in the 'netmasks' table; please update the 'netmasks' \n
table in the appropriate nameservice before continuing. \n
(See /etc/nsswitch.conf.) \n" >&2
return 1
else
# use the default.
NETMASK="${DEFMASK}"
fi
fi
#
# Create a batch file.
#
print -n "Creating batch file "
while [ ${ENTRYNUM} -lt ${ENDNUM} ]
do
if [ $((${ENTRYNUM}-${STRTNUM}))%50 -eq 0 ]
then
print -n "."
fi
CLIENTIP=`get_addr ${NETWORK} ${NETMASK} ${ENTRYNUM}`
print "pntadm -A ${CLIENTIP} -m ${MACRO} ${NETWORK}" >> ${BATCHFILE}
let ENTRYNUM=${ENTRYNUM}+1
done
print " done.\n"
#
# Run pntadm in batch mode and redirect output to a temporary file.
# Progress can be monitored by using the output file.
#
print "Batch processing output redirected to ${BATCHFILE}"
print "Batch processing started."
pntadm -B ${BATCHFILE} -v > /tmp/batch.out 2 >&1
print "Batch processing completed."
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