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#!/bin/bash
# Steven Shiau <steven@nchc.org.tw>
# License: GPL
# Description: To get the IP address lists from dhcpd.conf
# Loading setting.
# Load DRBL setting and functions
DRBL_SCRIPT_PATH="${DRBL_SCRIPT_PATH:-/usr/share/drbl}"
. $DRBL_SCRIPT_PATH/sbin/drbl-conf-functions
# Settings
sort_output="yes"
dhcpd_conf_def="$DHCPDCONF_DIR/dhcpd.conf"
#
USAGE() {
echo "$ocs - To get the DRBL clients' IP addresses list from dhcpd.conf"
echo "Usage:"
echo "To run $ocs:"
echo "$ocs [OPTION]"
echo "Options:"
echo "-w, --without-sorting List the clients' IP addresses list without sorting"
echo "-c, --dhcpd-config FILE Assign the DHCPD config file. By default $dhcpd_conf_def is used"
echo "-v, --verbose Run in verbose mode"
echo
} # end of USAGE
####################
### Main program ###
####################
ocs_file="$0"
ocs=`basename $ocs_file`
# Parse command-line options
while [ $# -gt 0 ]; do
case "$1" in
-w|--without-sorting)
shift; sort_output="no"
;;
-c|--dhcpd-config)
shift;
if [ -z "$(echo $1 |grep ^-.)" ]; then
# skip the -xx option, in case
dhcpd_conf="$1"
shift;
fi
[ -z "$dhcpd_conf" ] && USAGE && exit 1
;;
-v|--verbose)
shift; VERBOSE="on"
;;
-*) echo "${0}: ${1}: invalid option" >&2
USAGE >& 2
exit 2 ;;
*) break ;;
esac
done
#
if [ -z "$dhcpd_conf" ]; then
dhcpd_conf="$dhcpd_conf_def"
fi
if [ ! -e "$dhcpd_conf" ]; then
exit 1
fi
#
IPLIST="$(mktemp /tmp/iplist.XXXXXX)"
hn_ip_mac="$(mktemp /tmp/hn_ip_mac.XXXXXX)"
ip_range_nm="$(mktemp /tmp/ip_range_nm.XXXXXX)"
# (1) for MAC address part
parse_dhcpd_conf $hn_ip_mac >/dev/null 2>&1
LC_ALL=C grep -E "^[[:space:]]*[^#]" $hn_ip_mac | awk -F" " '{print $2}' | cat > $IPLIST
# (2) For range part
LC_ALL=C grep -iEo "^(^subnet[[:space:]]+[([:digit:]|\.]+[[:space:]]+netmask.*\{|[[:space:]]*range.*;)" $dhcpd_conf > $ip_range_nm
# The results in $ip_range_nm might like this (range in the subnet 192.168.27.0, and MAC addresses used in the subnet 172.16.0.0):
# subnet 192.168.27.0 netmask 255.255.255.0 {
# range 192.168.27.1 192.168.27.206;
# subnet 172.16.0.0 netmask 255.255.0.0 {
range_lines="$(LC_ALL=C grep -n -iEo "^[[:space:]]*range.*;" $ip_range_nm | awk -F":" '{print $1}')"
for i in $range_lines; do
pl="$((i-1))"
netmask="$(LC_ALL=C perl -ne "$pl..$i and print" $ip_range_nm | grep -Eo "netmask[[:space:]]+[([:digit:]|\.]+" | awk -F" " '{print $2}')"
range="$(LC_ALL=C perl -ne "$pl..$i and print" $ip_range_nm | grep -Eo "^[[:space:]]*range.*;" | sed -r -e "s/range //g" -e "s/;//g" -e "s/^[[:space:]]*//g")"
drbl-ipcalc-list -r $range $netmask >> $IPLIST
done
# We need to remove the DRBL server's IP address if they are in $IPLIST. In the dhcpd.conf, the range option contains a range, but any IP address of DRBL server might contain that, and we should not show that as the IP addresses of DRBL clients.
srv_IPs="$(LC_ALL=C get-all-nic-ip -b)"
for i in $srv_IPs; do
LC_ALL=C perl -pi -e "s/\b$i\b\n//g" $IPLIST
done
#
case "$sort_output" in
yes) LC_ALL=C cat $IPLIST | sort -V | uniq ;;
no) LC_ALL=C cat $IPLIST ;;
esac
# clean
[ -f "$IPLIST" ] && rm -f $IPLIST
[ -f "$hn_ip_mac" ] && rm -f $hn_ip_mac
[ -f "$ip_range_nm" ] && rm -f $ip_range_nm
exit 0
|
