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#!/bin/bash
#/**
# setserveraddr {str_ipaddress | str_netiface}
#@file setserveraddr
#@brief Command the modifies configuration files to assign the default network interface.
#@param str_ipaddress IP address assigned to a network interface
#@param str_netiface network interface name defined by the operating system.
#@version Initial version.
#@author Ramón M. Gómez - ETSII Univ. Sevilla
#@date 2011-01-25
#@version 1.0.5 - Regenerate configuration files.
#@author Ramón M. Gómez - ETSII Univ. Sevilla
#@date 2014-06-06
#@version 1.1.1 - Updating menu URLs, PXE files, and repository API key.
#@author Ramón M. Gómez - ETSII Univ. Sevilla
#@date 2018-11-15
#*/ ##
# Variables.
PROG="$(basename "$0")"
OPENGNSYS=/opt/opengnsys
PXEDIR=$OPENGNSYS/tftpboot/menu.lst
CONFIGFILE=$OPENGNSYS/etc/opengnsys.json
# Checking parameters.
if [ $# -ne 1 ]; then
echo "$PROG: Incorrect operand. Format: $PROG ipaddress|netiface" >&2
exit 1
fi
if [ "$USER" != "root" ]; then
echo "$PROG: Need to be root." >&2
exit 1
fi
# Showing warning to inform that initiated clients may hang.
read -rp "WARNING: initiated clients can hang. Continue? (y/n): " ANSWER
if [ "${ANSWER,,}" != "y" ]; then
echo "Operation canceled."
exit 0
fi
# Detecting network interfaces.
DEVICES=$(ip -o link show up | awk -F: '$2!~/lo/ {print $2}')
for DEV in $DEVICES; do
# If the network interface is found, get its IP address.
IP=$(ip -o addr show dev "$DEV" | awk '$3~/inet$/ {sub (/\/.*/, ""); print ($4)}')
if [ "$DEV" == "$1" ] || [ "$IP" == "$1" ]; then
SERVERIP="$IP"
SERVERDEV="$DEV"
fi
done
# Checking if IP address has been detected.
if [ -n "$SERVERIP" ]; then
# Temporary files.
tmpfile=$(mktemp /tmp/og.XXXXX)
trap "rm -f $tmpfile" 1 2 3 6 9 15
# Checking whether the DHCP settings need to be changed.
CHANGE=0
for f in /etc/{dhcp,hcp3}/dhcpd.conf; do
if [ -f $f ]; then
# Changing DHCP "next-server" parameter.
file="${f/./-$SERVERDEV.}"
sed -e "s/next-server.*/next-server $SERVERIP;/" \
-e "s/option routers ;/option routers ${SERVERIP%.*}.1;/" $file >$tmpfile
# Copying and linking file if there are changes.
if [ ! $f -ef $file ] || ! diff -q $tmpfile $file &>/dev/null; then
mv $tmpfile $file
chmod 644 $file
ln -f $file $f
CHANGE=1
fi
fi
done
# Restarting DHCP service if its configuration has changed.
if [ $CHANGE == 1 ]; then
for f in /etc/init.d/{isc-dhcp-server,dhcp3-server,dhcpd}; do
[ -x $f ] && $f restart
done
else
echo "DHCP configuration has not changed."
fi
OLDSERVERIP=$(jq -r .server.ip $CONFIGFILE)
if [ "$SERVERIP" != "$OLDSERVERIP" ]; then
# Updating configuration file.
jq ".server.ip=\"$SERVERIP\"" $CONFIGFILE | sponge $CONFIGFILE
# Updating all PXE files.
find $PXEDIR -name "01-*" -exec sed -i -e "s/$OLDSERVERIP/$SERVERIP/g" {} \;
# Showing manual task to do after execution.
cat << EOT
Default server interface set to: $SERVERDEV ($SERVERIP)
Manual tasks:
- Check DHCP configuration file and restart service, if needed.
- Check PXE files.
- Log-in as Web Console user:
- Check menu URLs.
EOT
else
# Showing message if nothing changes.
echo "Default interface has not changed: $1"
fi
else
# Error if network interface is not found.
echo "$PROG: Network device not found. Format: $PROG ipaddress|netiface" >&2
exit 1
fi
# Removing temporary file.
rm -f $tmpfile
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