#!/bin/sh 

# nkvir-update.sh - cron this to update your nkvir-rc.gz file nightly
# by Rudy Rucker.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.
#
# Fetch the new nkvir info and then install it.
# Do nothing if the file is not newer.
# This scrip also strips out all the different virus folders and crams
# everything into one virus folder.  Erase the 'perl' line below if you
# do not want this to occur.

# Note from mondeek: if a hacker can affect your DNS lookup of onlinhom.us
# hosts, they would be able to inject arbitrary code into your procmail ruleset. 
# added the PARANOID flag.

# set up in a cron, pipe to where you want the output emailed:
# 20 0 * * *   sleep $[ $RANDOM / 1024 ]; /usr/local/etc/mail/nkvir/update.sh | /usr/bin/mail -E -s "[zone_fetcher] step2"  myemail@mail.mon-keybrains.net

URL='http://s92562228.onlinehome.us/yavr/nkvir-rc.gz'
FILE='nkvir-rc.gz'
PARANOID="YES"

DIRECTORY="/usr/local/etc/mail/nkvir"

# all the foillowing commands assume you are in the right directory...
cd $DIRECTORY

# Get new file
if [ -f $FILE ]; then
	/usr/bin/touch -r $FILE timestamp
else
	/bin/rm timestamp 2> /dev/null;
fi
if [ -x /usr/local/bin/wget ]; then
	# wget is cool... it fill not fetch a file if the mod times don't merit the download
	/usr/local/bin/wget -N --quiet -U 'Wget - RemoteUpdate/0.3'  $URL
else
	/usr/bin/fetch $URL
fi

# Is it newer?
if [ $FILE -nt timestamp ]; then
	# if the timestamp file does not exist, the if will be FALSE
	echo "New $FILE downloaded!"
	echo "Source: $URL"
elif [ -f timestamp ] && [ -f nkvir-rc ]; then
	/bin/rm timestamp;
	exit;
elif [ -f $FILE ]; then
	echo "Downloaded $FILE for first time!"
	echo "Source: $URL"
	PARANOID="no"
	echo "Will auto install!"
else
	echo "$FILE failed to download..."
	echo "check your URL: $URL"
	exit;
fi

if [ ! -f nkvir-rc ] && [ $PARANOID = "YES" ]; then
	PARANOID="no"
	echo "Guess what?  I didn't find an installed version of nkvir-rc."
	echo "This script is going AUTO INSTALL it unless you hit CRTL-C"
	perl -e '$|=666; for (1..10) {$_ = 11-$_; print "\r $_ seconds till install "; sleep 1}'
	echo
fi

# Backup the old one, unzip the new one, patch it, and then install it.
# I like to patch it so all the viruses go into one folder.

/usr/bin/gunzip -c $FILE > nkvir-rc.dist
/bin/cp nkvir-rc.dist nkvir-rc.new
/usr/bin/perl -pi -e 's/(\$VIRDIR)\/virus-\S+/$1/' nkvir-rc.new
if [ -f nkvir-rc ]; then
	/bin/ln -f nkvir-rc nkvir-rc.OLD
	echo "---------------------- /usr/bin/diff  nkvir-rc nkvir-rc.new --------------------"
	/usr/bin/diff  nkvir-rc nkvir-rc.new
fi

if  [ $PARANOID = "YES" ]; then
	echo "--------------------------------------------------------------------------------"
	echo "Review diffs and Please install new nkvir file manually."
	echo "  mv $DIRECTORY/nkvir-rc.new $DIRECTORY/nkvir-rc"
else
	echo "Will install"
	sleep 2;
	/bin/ln -f nkvir-rc.new nkvir-rc
	unlink nkvir-rc.new
	echo "Automatically installed new nkvir ruleset.  Please review diffs."
fi