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#/bin/bash
# $Id: alcasar-bl.sh 842 2012-03-19 21:26:52Z richard $

# alcasar-bl.sh
# by Franck BOUIJOUX and Richard REY
# This script is distributed under the Gnu General Public License (GPL)

# Gestion de la BL pour le filtrage de domaine (via dnsmasq) et d'URL (via Dansguardian)
# Manage the BL for DnsBlackHole (dnsmasq) and URL filtering (Dansguardian)

CONF_FILE="/usr/local/etc/alcasar.conf"
DIR_tmp="/tmp/blacklists"
FILE_tmp="/tmp/fileFilter.txt"
DIR_DG="/etc/dansguardian/lists"
DIR_DG_BL="$DIR_DG/blacklists"
BL_CATEGORIES="/usr/local/etc/alcasar-bl-categories"
BL_CATEGORIES_ENABLED="/usr/local/etc/alcasar-bl-categories-enabled"
DIR_DNS_FILTER_AVAILABLE="/usr/local/etc/alcasar-dnsfilter-available"
DIR_DNS_FILTER_ENABLED="/usr/local/etc/alcasar-dnsfilter-enabled"
IP_RETOUR="20.0.0.1"
BL_SERVER="cri.univ-tlse1.fr"
SED="/bin/sed -i"

# Récupération de l'archive de la BL Toulouse
function transfert () {
        mkdir -p $DIR_tmp
        cd $DIR_tmp
        wget http://$BL_SERVER/blacklists/download/blacklists.tar.gz
}
# Décompression de la BL (en conservant la WL)
function install () {
        [ -d $DIR_DG ] || mkdir -p $DIR_DG
        [ -d $DIR_DG_BL/ossi ] && mv -f $DIR_DG_BL/ossi $DIR_tmp
        [ -d $DIR_DG_BL/ip ] && mv -f $DIR_DG_BL/ip $DIR_tmp
        tar zxf $DIR_tmp/blacklists.tar.gz --directory=$DIR_DG/
        [ -d $DIR_tmp/ossi ] && mv -f $DIR_tmp/ossi $DIR_DG_BL/
        [ -d $DIR_tmp/ip ] && mv -f $DIR_tmp/ip $DIR_DG_BL/
        cd /root
        rm -rf $DIR_tmp
}
# Adaptation de la BL Toulouse à la structure Dnsmasq
function adapt () {
        # On récupère le nom des répertoire (catégories)
        find $DIR_DG_BL/ -type f -name domains > $BL_CATEGORIES
        # On supprime le suffice "/domains"
        $SED "s?\/domains??g" $BL_CATEGORIES
        rm -f $DIR_DNS_FILTER_AVAILABLE/*
        echo -n "Toulouse BlackList migration process. Please wait : "
        # pour chaque catégorie
        for PATH_FILE in `cat $BL_CATEGORIES`
        do
                echo -n "."
                # on crée le fichier 'urls' s'il n'existe pas
                if [ ! -f $PATH_FILE/urls ]
                then
                        touch $PATH_FILE/urls
                        chown dansguardian:apache $PATH_FILE/urls
                fi
                # suppression des @IP, des lignes commentées et des caractères bizarres comme les ô et û ö ü
                egrep  -v "([0-9]{1,3}\.){3}[0-9]{1,3}" $PATH_FILE/domains > /tmp/dnsmasq-bl.tmp
                $SED "/[äâëêïîöôüû]/d" /tmp/dnsmasq-bl.tmp
                $SED "/^#.*/d" /tmp/dnsmasq-bl.tmp
                # Mise en forme dnsmasq
                $SED "s?.*?address=/&/$IP_RETOUR?g" /tmp/dnsmasq-bl.tmp
                DOMAINE=`basename $PATH_FILE`
                mv /tmp/dnsmasq-bl.tmp $DIR_DNS_FILTER_AVAILABLE/$DOMAINE.conf
        done
        echo
}
# Permet d'activer/désactiver les catégories de la BL
function cat_choice (){
        # un peu de ménage
        rm -rf $DIR_DNS_FILTER_ENABLED/*
        $SED "/\.Include/d" $DIR_DG/bannedsitelist $DIR_DG/bannedurllist
        # on adapte le fichier $BL_CATEGORIES au choix de catégorie 
        $SED "s?^[^#]?#&?g" $BL_CATEGORIES # on commente ce qui ne l'est pas
        for ENABLE_CATEGORIE in `cat $BL_CATEGORIES_ENABLED` # on affecte les catégories à dansguardian et dnsmasq
        do
                $SED "/\/$ENABLE_CATEGORIE$/d" $BL_CATEGORIES
                $SED "1i\/etc\/dansguardian\/lists\/blacklists\/$ENABLE_CATEGORIE" $BL_CATEGORIES
                ln -s $DIR_DNS_FILTER_AVAILABLE/$ENABLE_CATEGORIE.conf $DIR_DNS_FILTER_ENABLED/$ENABLE_CATEGORIE
                # echo ".Include<$DIR_DANSGUARDIAN/blacklists/$ENABLE_CATEGORIES/domains>" >> $DIR_DANSGUARDIAN/bannedsitelist  # dansguardian ne s'occupe plus des noms de domaine
                echo ".Include<$DIR_DG_BL/$ENABLE_CATEGORIE/urls>" >> $DIR_DG/bannedurllist
        done
        sort -k2n $BL_CATEGORIES > $FILE_tmp
        mv $FILE_tmp $BL_CATEGORIES
}
function bl_enable (){
        $SED "s/^reportinglevel =.*/reportinglevel = 3/g" /etc/dansguardian/dansguardian.conf
        $SED "s?^#\"?\"?g" $DIR_DG/urlregexplist # Enable 'safesearch'
        if [ "$PARENT_SCRIPT" != "/usr/local/bin/alcasar-conf.sh" ] # don't launch on install stage
        then
                service dansguardian restart
                service dnsmasq restart
                /usr/local/bin/alcasar-iptables.sh
        fi
}
function bl_disable (){
        rm -rf $DIR_DNS_FILTER_ENABLED/*
        $SED "s/^reportinglevel =.*/reportinglevel = -1/g" /etc/dansguardian/dansguardian.conf
        $SED "s?^[^#]?#&?g" $DIR_DG/urlregexplist # Disable 'safesearch'
        if [ "$PARENT_SCRIPT" != "/usr/local/bin/alcasar-conf.sh" ] # don't launch on install stage
        then
                service dansguardian restart
                service dnsmasq restart
                /usr/local/bin/alcasar-iptables.sh
        fi
}
usage="Usage: alcasar-bl.sh {-on or --on} | { -off or --off } | { -download or --download } | { -reload or --reload }"
nb_args=$#
args=$1
if [ $nb_args -eq 0 ]
then
        DNS_FILTERING=`grep DNS_FILTERING $CONF_FILE|cut -d"=" -f2`             # DNS and URLs filter (on/off)
        DNS_FILTERING=${DNS_FILTERING:=off}
        echo "Set BlackList Filtering to $DNS_FILTERING"
        if [ $DNS_FILTERING = on ]; then
                cat_choice
                bl_enable
        else
                bl_disable
        fi
        exit 0
fi
case $args in
        -\? | -h* | --h*)
                echo "$usage"
                exit 0
                ;;
        # activation du filtrage
        -on | --on)     
                cat_choice
                $SED "s?^DNS_FILTERING.*?DNS_FILTERING=on?g" $CONF_FILE
                bl_enable
                ;;
        # désactivation du filtrage
        -off | --off)
                $SED "s?^DNS_FILTERING.*?DNS_FILTERING=off?g" $CONF_FILE
                bl_disable
                ;;
        # Mise a jour de la blacklist 'Toulouse' et adaptation à dansguardian et dnsmasq
        -download | --download)
                rm -rf /tmp/con_ok.html
                `/usr/bin/curl $BL_SERVER -# -o /tmp/con_ok.html`
                if [ ! -e /tmp/con_ok.html ]
                then
                        echo "Erreur : le serveur de blacklist ($BL_SERVER) n'est pas joignable"
                else 
                        transfert
                        install
                        chown -R dansguardian:apache $DIR_DG
                        chmod -R g+w $DIR_DG
                        rm -rf /tmp/con_ok.html
                fi
                ;;              
        # Adaptation de la BL à notre structure 'dnsmasq + DG)
        -adapt | --adapt)
                adapt
                cat_choice
                ;;
        # regénération suite à modification (choix catégories ou BL secondaire)
        -reload | --reload)
                adapt
                # pour Dansguardian
                chown -R dansguardian:apache $DIR_DG_BL/ossi
                chmod -R g+w $DIR_DG_BL/ossi
                cat_choice
                # pour dnsmasq (noms de domaine réhabilités)
                if [ `wc -w $DIR_DG/exceptionsitelist|cut -d " " -f1` != "0" ]
                then
                        for i in `cat $DIR_DG/exceptionsitelist`
                        do
                                $SED "/$i/d" $DIR_DNS_FILTER_AVAILABLE/*
                        done
                fi
                cp -f $DIR_DG_BL/ossi/domains $DIR_DNS_FILTER_AVAILABLE/ossi.conf
                $SED "s?.*?address=/&/$IP_RETOUR?g" $DIR_DNS_FILTER_AVAILABLE/ossi.conf
                IP_PURE=`grep '^ip' $BL_CATEGORIES_ENABLED|wc -l`
                if [ $IP_PURE -eq "1" ]; then   # filtrage des url sans nom de domaine
                        $SED "s/^\#\*ip$/*ip/g" $DIR_DG/bannedsitelist
                else
                        $SED "s/^\*ip$/#*ip/g" $DIR_DG/bannedsitelist
                fi
                DNS_FILTERING=`grep DNS_FILTERING $CONF_FILE|cut -d"=" -f2`             # DNS and URLs filter (on/off)
                DNS_FILTERING=${DNS_FILTERING:=off}
                if [ $DNS_FILTERING = on ]; then
                        bl_enable
                else
                        bl_disable
                fi
                ;;
        *)
                echo "Argument inconnu :$1";
                echo "$usage"
                exit 1
                ;;
esac