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#!/bin/bash
#@file addtodhcp
#@brief Append a "host" section for each defined computer to the DHCP configuration file.
#@usage addtodhcp [-f FILE] [-r] [-e] [ {LABNAME|COMPUTERNAME} ...]
#@param -f, --file FILE DHCP configuration file (/etc/dhcp/dhcpd.conf, by default)
#@param -r, --restart restart DHCP service
#@param -e, --exam assign to alternative network ("exam mode" from Universidad de Sevilla)
#@param LABNAME only add computers defined in this lab
#@param COMPUTERNAME only add a single computer data
#@version 1.1.1b - Initial version.
#@author Ramón M. Gómez - ETSII Univ. Sevilla
#@date 2020-02-03
# Variables.
PROG="$(basename "$0")"
OPENGNSYS=${OPENGNSYS:-"/opt/opengnsys"}
SERVERCONF=$OPENGNSYS/etc/ogAdmServer.cfg
DHCPCONF=/etc/dhcp/dhcpd.conf
DHCPCONFBCK="$DHCPCONF-$(date +"%Y%m%d")"
source $OPENGNSYS/lib/ogfunctions.sh || exit 1
# Show help or version number.
[ "$*" == "help" ] && help
[ "$*" == "version" ] && version
# Error control.
[ "$USER" != "root" ] && raiseError access "Need to be root"
source $SERVERCONF 2>/dev/null || raiseError access "Cannot read OpenGnsys Server configuration file"
# Processing parameters.
RESOURCES="$*"
opts=$(getopt -n "$PROG" -l exam,file:,restart -o 'ef:r' -- "$@" ) || raiseError usage
set -- $opts
while [ "$1" ]; do
case "$1" in
-e|--exam)
EXAM=1
shift ;;
-f|--file)
eval DHCPCONF=$2
shift 2 ;;
-r|--restart)
RESTART=1
shift ;;
--)
shift; break ;;
esac
done
[ -f $DHCPCONF ] || raiseError access "Cannot access DHCP configuration file"
grep -q "^[ ]*\bsubnet\b" $DHCPCONF || raiseError access "Cannot detect any \"group\" clauses in DHCP configuration file"
grep -q "^[ ]*\bgroup\b" $DHCPCONF && raiseError access "Cannot modify DHCP configuration file with \"group\" clauses"
[ "$*" ] && WHEREEXPR="WHERE $(echo ${*//\'/\\\'} | sed -e "s/\('[^']*'\)/nombreaula=\1 OR nombreordenador=\1 OR/g")"
WHEREEXPR="${WHEREEXPR% OR}"
# Looking for data.
SEDEXPR=""
while read -pe NAME IP MAC ROUTER LAB; do
[ "$LAB" ] || break
if [ "$EXAM" ]; then
IP="${IP/10.1./192.168.}"
ROUTER="${ROUTER/10.1./192.168.}"
fi
# Check if router is defined.
if ! grep -Eq "routers[[:space:]]+$ROUTER" $DHCPCONF; then
raiseError notfound "Router \"$ROUTER\" not defined in DHCP configuration file"
fi
# Find any "host" clause.
SEDEXPR+="/\bhost $NAME\b/"
if ! grep -Eq "host[[:space:]]+$NAME[[:space:]]*}" $DHCPCONF; then
SEDEXPR+=",/}/"
fi
if [ "$LAB" != "$LABBCK" ]; then
NEWLAB="\\\n"
LABBCK="$LAB"
else
NEWLAB=""
fi
# Delete the found "host" clause and add a new one.
SEDEXPR+="d
/^[[:space:]]*option[[:space:]]+routers[[:space:]]+\b$ROUTER\b/a ${NEWLAB}host $NAME { hardware ethernet $MAC; fixed-address $IP; } # $LAB
"
done <<<$(dbexec "
SELECT nombreordenador, ip,
CONCAT_WS('', SUBSTR(mac, 1, 2), ':', SUBSTR(mac, 3, 2), ':', SUBSTR(mac, 5, 2), ':',
SUBSTR(mac, 7, 2), ':', SUBSTR(mac, 9, 2), ':', SUBSTR(mac, 11, 2)),
ordenadores.router, nombreaula
FROM ordenadores
JOIN aulas USING (idaula)
$WHEREEXPR
ORDER BY nombreaula ASC, idordenador ASC;" 2>/dev/null)
# Edit DHCP configuration file.
[ "$SEDEXPR" ] || raiseError notfound "$RESOURCES"
cp -a $DHCPCONF $DHCPCONFBCK || raiseError access "Cannot back-up DHCP configuration file"
sed -i -re "$SEDEXPR" $DHCPCONF
# Delete duplicate empty lines.
perl -0777pi -e "s/\n{3,}/\n\n/g" $DHCPCONF
# Restart the service, if needed.
[ "$RESTART" ] && restart isc-dhcp-server
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