avscan

#! /bin/bash

#Usage Message
usage () {
	echo "Usage: [PROGRAM_NAME]"	
}

#Exit Function
exit_func () {
	
	if [ "$1" -eq 3 ]; then
		echo "Exit 3 --> Wrong Number of Arguments."
		exit 1
	elif [ "$1" -eq 0 ]; then
		echo "Exit 0 --> Success!"
		exit 0
	elif [ "$1" -eq 1 ]; then
		echo "Exit 1 --> There Were Infected Files"
		exit 1
	elif [ "$1" -eq 2 ]; then
		echo "Exit 2 --> Error Performing AV Scan"
		exit 2
	fi
}

#If Number of Arguments Is Correct
if [ "$#" -eq 0 ]; then

	#Using ClamAV To Conduct Antivirus Scan, Save Scan Results as "date"avscan.txt
	#Options: -r: recursively scan directories and subdirectories, -o: Do not print OK on each file
	clamscan -r -o --log=/save/results/here/by_date/`date +%F`avscan.txt /path/to/files/to/scan > /dev/null 2>&1
	
	#ClamAV Result Codes: 0-->No Virus Found, 1-->Virus Detected, 2-->Error Occured
	result=$?

	#If Scan Returns Value Other Than 0, Email SysAdmin About Possible Infected Files
	#Using This Script Assumes You Have Already Set Up Sendmail/Postfix 
	if [ $result -eq 1 ]; then
		echo "There were infected files detected on your system. " | mail -s "Warning: Infected Files" your_email@email.com
		exit_func 1
	elif [ $result -eq 0 ]; then
		exit_func 0
	elif [ $result -eq 2 ]; then
		exit_func 2
	fi
else
	#If Arguments Are Incorrect, Print Usage and Exit
	usage
	exit_func 3
	
fi