#***********************************************************************
# E.S.O. - VLT project
#
# buildTestCCS
#
# "@(#) $Id: acsDHCPBoot,v 1.127 2006/01/12 23:53:54 sharring Exp $"
#
# who       when      what
# --------  --------  ----------------------------------------------
# almamgr 2003-08-31 If host name unknown, use 'alma'
# dave 2003-08-26 get rid of extra "." in the fully qualified hostname on NRAO machines
# dave 2003-08-26 now check for multiple addresses in $IP.  the first IP that passes an nslookup inspection is used.
#                 this is not necessarily etho0 though!
# dave 2003-08-26 removed most of the output statements, but added checks on everything that print error messages 
#                 and exit the script on any error condition
# david 2002-10-23 added a '-' in regular expression and made backups of network config in /tmp
# gchiozzi 2002-06-28 Added more diagnostic. Made $NETWORKING env var not compulsory
# rle/jib 2002-04-10  Created
#

#************************************************************************
#   NAME
#   acsDHCPBoot - Root script to configure dhcp networking for ACS
#
#   SYNOPSIS
#   acsDHCPBoot
# 
#   DESCRIPTION
#   acsDHCPBoot should be should only be executed if the station 
#   is recognized as a networked station (the NETWORKING 
#   variable defined under /etc/sysconfig/network is used). 
#   Currently only a WARNING is issued if this is not the case, bacause
#   NRAO Laptop installation does not set the NETWORKING variable.
#
#   acsDHCPBoot detects if the station is using DHCP by looking at the BOOTPROTO
#   variable under /etc/sysconfig/network-scripts/ifcfg-eth0 and if it is the
#   case it retrieves the IP, hostname, and fully qualified hostname to set
#   the correct hostname and to replace the network configuration files by
#   correct ones (/etc/hosts, /etc/sysconfig/network, /etc/HOSTNAME).
#
#   If the host name of the machine is unknown/undefined, 'alma' in 'localdomain'
#   is used and a warning is issued
#
#   In order to have this script executed automatically at boot time:
#   - login as root
#   - put the init configuration file acsDHCPConfig that you find
#     $ACSROOT/config/rc.d/init.d/ into /etc/rc.d/init.d and make it executable.
#   - Create the following links:
#     cd /etc/rc.d/rc3.d; ln -s ../init.d/acsDHCPConfig S99ZacsDHCPConfig
#     cd /etc/rc.d/rc4.d; ln -s ../init.d/acsDHCPConfig S99ZacsDHCPConfig
#     cd /etc/rc.d/rc5.d; ln -s ../init.d/acsDHCPConfig S99ZacsDHCPConfig
#
#   FILES
#
#   ENVIRONMENT
#
#   RETURN VALUES
#
#   CAUTIONS
#
#   EXAMPLES
#
#   SEE ALSO
#
#   BUGS     
#
#------------------------------------------------------------------------
#

echo "acsDHCPBoot: Configuring for dhcp"

#Used to ensure backup file names are unique
MYTIME=`/bin/date -Iseconds`

# Determine the active ethernet interface
cd /etc/sysconfig/network-scripts

ethernet_config_files=`ls -1r ifcfg-*`

for file in $ethernet_config_files
do
	interface=`echo $file | cut -d"-" -f2`
	/sbin/ifconfig $interface 2> /dev/null | grep -q "UP BROADCAST RUNNING" && export ETHERNET_INTERFACE=$interface
done 

if [ XX"$ETHERNET_INTERFACE" = XX ]; then
	echo "WARNING!: No active ethernet interface found!"
	echo "Terminating this script"
	exit 1
fi

cd -

# if we've made it this far without exiting, then we have found an active ethernet interface
# which we will now configure. We will make backups of the files that we modify and place them in /tmp.
if [ -f /etc/sysconfig/network ]; then

	echo "Backups of files modified by this script can be found in /tmp/ with \".$MYTIME\" appended to them..."
	echo ""

	# sourcing /etc/sysconfig/network
	. /etc/sysconfig/network

	if [ "$NETWORKING" != "yes" ]; then
		echo "WARNING!: Networking=\"$NETWORKING\"!"
	fi

	# make a backup
	cp /etc/sysconfig/network /tmp/network.$MYTIME

	if [ -f /etc/sysconfig/network-scripts/ifcfg-$ETHERNET_INTERFACE ]; then

		# sourcing /etc/sysconfig/network-scripts/ifcfg-$ETHERNET_INTERFACE
		.  /etc/sysconfig/network-scripts/ifcfg-$ETHERNET_INTERFACE

		if [ "$BOOTPROTO" = "dhcp" ]; then

			IP=`/sbin/ifconfig $ETHERNET_INTERFACE | grep inet | grep Bcast | cut -d: -f2 |   cut -d' ' -f1`

			FQHNAME=`nslookup $IP 2>/dev/null 2>/dev/null | grep "name ="   | cut -d= -f2 | sed 's/ //g' | sed 's/[.]$//g'`

			if [ XX"$FQHNAME" = XX ]; then
				echo "WARNING!: I have no idea what the name of this host is!"
				echo "          Using 'alma'!"
				echo "IP=\"$IP\""
				#echo "Terminating this script"
				#exit 1
				FQHNAME=`echo alma.localdomain`
			fi

			HNAME=`echo $FQHNAME | cut -d. -f1`
			cat /etc/sysconfig/network | sed   s/HOSTNAME=[\",a-z,A-Z,0-9,-,_]*/HOSTNAME=$HNAME/g > /etc/sysconfig/network
			# make a backup
			cp /etc/HOSTNAME /tmp/HOSTNAME.$MYTIME
			echo $HNAME > /etc/HOSTNAME
			/bin/hostname $HNAME

			# make a backup
			cp /etc/hosts /tmp/hosts.$MYTIME
			echo "#Generated by the acsDHCPBoot script" >  /etc/hosts
			echo "127.0.0.1    localhost.localdomain localhost" >>  /etc/hosts
			echo "IP=\"$IP\" Fully Qualified Hostname=\"$FQHNAME\" Hostname=\"$HNAME\""
			echo "$IP  $FQHNAME        $HNAME" >> /etc/hosts
		else
			echo "WARNING!: The boot protocol is \"$BOOTPROTO\"!"
			echo "This script cannot use anything other than \"dhcp\"!"
			echo "Terminating this script"
			exit 1
		fi
	else
		echo "WARNING!: Could not find /etc/sysconfig/network-scripts/ifcfg-$ETHERNET_INTERFACE"
		echo "Terminating this script"
		exit 1
	fi
else
	echo "WARNING!: /etc/sysconfig/network does not exist!"
	echo "Terminating this script"
	exit 1
fi

echo "acsDHCPBoot Done!"

#
# ___oOo___