#!/bin/sh
#
#NADDS Agent - http://nadds.drmadcow.net/
#Critical file change agent.
#Agent Author: Daryl Quenet
#Date: 2003-May-27 (V1.5)
	
. /usr/local/bcnu/etc/bcnuenv
. $BCNUHOME/agent/agent_head

OUTFILE=$BCNUTMP/${BCNUAGENT}.out
MSGFILE=$BCNUTMP/${BCNUAGENT}.msg
ERR_MSG_FILE=$BCNUTMP/${BCNUAGENT}.err
HISTFILE=$BCNUTMP/${BCNUAGENT}.hist

rm -f $TMPFILE $HISTFILE $ERR_MSG_FILE $OUTFILE $MSGFILE 2>/dev/null

if [ ! -d $BCNUHOME/data/${BCNUAGENT}-archive ]; then
	mkdir -p $BCNUHOME/data/${BCNUAGENT}-archive 
fi

ERR=""
WARN=""
MSG=""
ERRMSG=""
WARNMSG=""

for param in $BCNUPARAM
do
bcnu_param

filename=$p1
filehandle=$p2

if [ ! -f $BCNUHOME/data/${BCNUAGENT}-archive/$filehandle ]; then
	cp -p $filename "${BCNUHOME}/data/${BCNUAGENT}-archive/$filehandle"
	if [ ! -f "${BCNUHOME}/data/${BCNUAGENT}-archive/$filehandle" ]; then
		WARNMSG="warning - $filename is not being monitored. Check file permissions/spelling"
		echo $WARNMSG >> $ERR_MSG_FILE 
		WARN=1
	else
		MSG="$filename is now being monitored."
		echo $MSG >>$MSGFILE
	fi	
fi 

fileperm=`ls -l $filename|awk '{print $1}'`
filehperm=`ls -l "$BCNUHOME/data/${BCNUAGENT}-archive/$filehandle"|awk '{print $1}'`

diff "$filename" $BCNUHOME/data/${BCNUAGENT}-archive/$filehandle 2> /dev/null
if [ $? = 1 ]; then
	ERRMSG="error - Contents of $filename have changed, original backed up"
	timestamp=`date +%Y%m%d%H%M%S`
	namedtime="${filehandle}_${timestamp}"
	cd $BCNUHOME/data/${BCNUAGENT}-archive/
	tar cfpz "$namedtime".tgz $filehandle
	rm -f "$BCNUHOME/data/${BCNUAGENT}-archive/$filehandle"
	cp -p $filename "$BCNUHOME/data/${BCNUAGENT}-archive/$filehandle"
	echo $ERRMSG >>$ERR_MSG_FILE
	if [ ! -f $MSGFILE ]; then
		touch $MSGFILE	
	fi
	ERR=1
	echo -e "\t$namedtime" >>$HISTFILE
elif [ $fileperm != $filehperm || -f $filename]; then
	ERRMSG="error - ${filename}s permissions have changed from $filehperm to ${fileperm}"
	echo $ERRMSG >>$ERR_MSG_FILE
	if [ ! -f $MSGFILE ]; then
		touch $MSGFILE
	fi
	ERR=1
else
	if [ -f $BCNUHOME/data/${BCNUAGENT}-archive/$filehandle ]; then
		MSG="ok - $filename is intact"
		echo $MSG >>$MSGFILE
	fi
fi
done

if [ -f $MSGFILE ]; then 
	printf "File status:\n\n" > $OUTFILE
	if [ -f $ERR_MSG_FILE ]; then
		sort_by_severity '-k 1' $ERR_MSG_FILE >> $OUTFILE
	fi
	sort_by_severity '-k 1' $MSGFILE >> $OUTFILE
fi

if [ -f $HISTFILE ]; then
	hostname=`hostname`
        printf "\nNewly archived files in ${hostname}:${BCNUHOME}/data/${BCNUAGENT}-archive\n" >>$OUTFILE
	cat $HISTFILE >>$OUTFILE
fi

if [ $ERR ]; then
	BCNUMSG="$BCNU -m '$ERRMSG' -f $OUTFILE -e $BCNU_ERR -t $BCNUHOSTTYPE $BCNUHOST"
	bcnu_err_send
elif [ $WARN ]; then
	BCNUMSG="$BCNU -m '$WARNMSG' -f $OUTFILE -e $BCNU_WARN -t $BCNUHOSTTYPE $BCNUHOST" 
	bcnu_warn_send
else
	BCNUMSG="$BCNU -m 'ok - no critical files have changed' -f $OUTFILE -e $BCNU_OK -t $BCNUHOSTTYPE $BCNUHOST"
	bcnu_send
fi