#!/bin/bash
#
# .---.                  .              .
# |                      |              |
# |--- .--. .-.  .-.  .-.|  .-. .--.--. |.-.  .-. .--.  .-.
# |    |   (.-' (.-' (   | (   )|  |  | |   )(   )|  | (.-'
# '    '     --'  --'  -' -  -' '  '   -' -'   -' '   -  --'
#
#                    Freedom in the Cloud
#
# pi-hole ad blocker
#
# Adapted from instructions at:
#  http://jacobsalmela.com/block-millions-ads-network-wide-with-a-raspberry-pi-hole-2-0/#manualsetup
#
# License
# =======
#
# Copyright (C) 2016 Bob Mottram <bob@freedombone.net>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

VARIANTS='full full-vim adblocker'

IN_DEFAULT_INSTALL=0
SHOW_ON_ABOUT=0

PIHOLE_IFACE=eth0
PIHOLE_DNS1='85.214.73.63'
PIHOLE_DNS2='213.73.91.35'

piholeBasename=pihole
piholeDir=/etc/$piholeBasename
PIHOLE_CUSTOM_ADLIST=$piholeDir/adlists.list
PIHOLE_BLACKLIST=$piholeDir/blacklist.txt
PIHOLE_WHITELIST=$piholeDir/whitelist.txt

PIHOLE_REPO="https://github.com/pi-hole/pi-hole"
PIHOLE_COMMIT='bef0a2fef08b39780610b8885407b855edd3ba49'

pihole_variables=(ONION_ONLY
                  PIHOLE_IFACE
                  PIHOLE_DNS1
                  PIHOLE_DNS2)

function logging_on_pihole {
    echo -n ''
}

function logging_off_pihole {
    echo -n ''
}

function pihole_copy_files {
    if [ ! -d /etc/.pihole ]; then
        mkdir /etc/.pihole
    fi
    cp $INSTALL_DIR/pihole/adlists.default /etc/.pihole/adlists.default
    cp $INSTALL_DIR/pihole/adlists.default $piholeDir/adlists.default
    if [ ! -f $PIHOLE_CUSTOM_ADLIST ]; then
        cp $INSTALL_DIR/pihole/adlists.default $PIHOLE_CUSTOM_ADLIST
    fi
    cp $INSTALL_DIR/pihole/advanced/Scripts/* /opt/$piholeBasename
    if [ -f /etc/dnsmasq.d/01-pihole.conf ]; then
        rm /etc/dnsmasq.d/01-pihole.conf
    fi
    cp $INSTALL_DIR/pihole/advanced/pihole.cron /etc/cron.d/pihole
    cp $INSTALL_DIR/pihole/gravity.sh /opt/$piholeBasename
    chmod +x /opt/pihole/*.sh
}

function pihole_change_ipv4 {
    new_ipv4="$1"
    if [ -f /usr/local/bin/pihole ]; then
        setupVars=$piholeDir/setupVars.conf
        if [ -f $setupVars ]; then
            sed -i "s|IPv4_address=.*|IPv4_address=${new_ipv4}|g" $setupVars
        fi
    fi
}

function pihole_update {
    if [ ! -f /usr/local/bin/gravity.sh ]; then
        return
    fi

    if [ ! -f $HOME/${PROJECT_NAME}-wifi.cfg ]; then
        PIHOLE_IFACE=eth0
    else
        read_config_param WIFI_INTERFACE
        PIHOLE_IFACE=$WIFI_INTERFACE
    fi

    IPv4_address="$(get_ipv4_address)"
    IPv6_address="$(get_ipv6_address)"

    setupVars=$piholeDir/setupVars.conf
    echo "piholeInterface=${PIHOLE_IFACE}" > ${setupVars}
    echo "IPV4_ADDRESS=${IPv4_address}" >> ${setupVars}
    if [ ${#IPv6_address} -gt 0 ]; then
        echo "IPV6_ADDRESS=${IPv6_address}" >> ${setupVars}
    fi
    echo "piholeDNS1=${PIHOLE_DNS1}" >> ${setupVars}
    echo "piholeDNS2=${PIHOLE_DNS1}" >> ${setupVars}

    echo 'domain-needed' > /etc/dnsmasq.conf
    echo 'bogus-priv' >> /etc/dnsmasq.conf
    echo 'no-resolv' >> /etc/dnsmasq.conf
    echo "server=${PIHOLE_DNS1}" >> /etc/dnsmasq.conf
    echo "server=${PIHOLE_DNS2}" >> /etc/dnsmasq.conf
    echo "interface=${PIHOLE_IFACE}" >> /etc/dnsmasq.conf
    echo 'listen-address=127.0.0.1' >> /etc/dnsmasq.conf

    pihole -g
    systemctl restart dnsmasq

    # avoid having the tripwire report pihole updates
    if ! grep -q '!/etc/pihole' /etc/tripwire/twpol.txt; then
        sed -i '\|/etc\t\t->.*|a\    !/etc/pihole ;' /etc/tripwire/twpol.txt
    fi
}

function pihole_change_upstream_dns {
    data=$(tempfile 2>/dev/null)
    trap "rm -f $data" 0 1 2 5 15
    dialog --backtitle $"Ad Blocker Upstream DNS" \
           --radiolist $"Pick a domain name service (DNS):" 25 50 16 \
           1 $"Digital Courage" on \
           2 $"German Privacy Foundation 1" off \
           3 $"German Privacy Foundation 2" off \
           4 $"Chaos Computer Club" off \
           5 $"ClaraNet" off \
           6 $"OpenNIC 1" off \
           7 $"OpenNIC 2" off \
           8 $"OpenNIC 3" off \
           9 $"OpenNIC 4" off \
           10 $"OpenNIC 5" off \
           11 $"OpenNIC 6" off \
           12 $"OpenNIC 7" off \
           13 $"PowerNS" off \
           14 $"ValiDOM" off \
           15 $"Freie Unzensierte" off \
           16 $"Google" off 2> $data
    sel=$?
    case $sel in
        1) exit 1;;
        255) exit 1;;
    esac
    case $(cat $data) in
        1) PIHOLE_DNS1='85.214.73.63'
           PIHOLE_DNS2='213.73.91.35'
           ;;
        2) PIHOLE_DNS1='87.118.100.175'
           PIHOLE_DNS2='94.75.228.29'
           ;;
        3) PIHOLE_DNS1='85.25.251.254'
           PIHOLE_DNS2='2.141.58.13'
           ;;
        4) PIHOLE_DNS1='213.73.91.35'
           PIHOLE_DNS2='85.214.73.63'
           ;;
        5) PIHOLE_DNS1='212.82.225.7'
           PIHOLE_DNS2='212.82.226.212'
           ;;
        6) PIHOLE_DNS1='58.6.115.42'
           PIHOLE_DNS2='58.6.115.43'
           ;;
        7) PIHOLE_DNS1='119.31.230.42'
           PIHOLE_DNS2='200.252.98.162'
           ;;
        8) PIHOLE_DNS1='217.79.186.148'
           PIHOLE_DNS2='81.89.98.6'
           ;;
        9) PIHOLE_DNS1='78.159.101.37'
           PIHOLE_DNS2='203.167.220.153'
           ;;
        10) PIHOLE_DNS1='82.229.244.191'
            PIHOLE_DNS2='82.229.244.191'
            ;;
        11) PIHOLE_DNS1='216.87.84.211'
            PIHOLE_DNS2='66.244.95.20'
            ;;
        12) PIHOLE_DNS1='207.192.69.155'
            PIHOLE_DNS2='72.14.189.120'
            ;;
        13) PIHOLE_DNS1='194.145.226.26'
            PIHOLE_DNS2='77.220.232.44'
            ;;
        14) PIHOLE_DNS1='78.46.89.147'
            PIHOLE_DNS2='88.198.75.145'
            ;;
        15) PIHOLE_DNS1='85.25.149.144'
            PIHOLE_DNS2='87.106.37.196'
            ;;
        16) PIHOLE_DNS1='8.8.8.8'
            PIHOLE_DNS2='4.4.4.4'
            ;;
        255) exit 1;;
    esac
    write_config_param "PIHOLE_DNS1" "$PIHOLE_DNS1"
    write_config_param "PIHOLE_DNS2" "$PIHOLE_DNS2"
}

function update_pihole_interactive {
    clear
    echo $'Updating Ad Blocker Lists'
    echo ''
    pihole_update
}

function configure_firewall_for_pihole {
    firewall_add DNS 53
}

function pihole_pause {
    pihole disable
    dialog --title $"Pause Ad Blocker" \
           --msgbox $"Ad blocking is paused" 6 60
}

function pihole_resume {
    pihole enable
    dialog --title $"Resume Ad Blocker" \
           --msgbox $"Ad blocking has resumed" 6 60
}

function configure_interactive_pihole {
    while true
    do
        data=$(tempfile 2>/dev/null)
        trap "rm -f $data" 0 1 2 5 15
        dialog --backtitle $"Freedombone Control Panel" \
               --title $"Ad Blocker" \
               --radiolist $"Choose an operation:" 16 70 7 \
               1 $"Edit ads list" off \
               2 $"Edit blacklisted domain names" off \
               3 $"Edit whitelisted domain names" off \
               4 $"Change upstream DNS servers" off \
               5 $"Pause blocker" off \
               6 $"Resume blocker" off \
               7 $"Exit" on 2> $data
        sel=$?
        case $sel in
            1) exit 1;;
            255) exit 1;;
        esac
        case $(cat $data) in
            1) editor $PIHOLE_CUSTOM_ADLIST
               update_pihole_interactive
               ;;
            2) editor $PIHOLE_BLACKLIST
               update_pihole_interactive
               ;;
            3) editor $PIHOLE_WHITELIST
               update_pihole_interactive
               ;;
            4) pihole_change_upstream_dns
               update_pihole_interactive
               ;;
            5) pihole_pause
               ;;
            6) pihole_resume
               ;;
            7) break;;
        esac
    done
}

function install_interactive_pihole {
    APP_INSTALLED=1
}

function reconfigure_pihole {
    echo -n ''
}

function upgrade_pihole {
    CURR_PIHOLE_COMMIT=$(get_completion_param "pihole commit")
    if [[ "$CURR_PIHOLE_COMMIT" == "$PIHOLE_COMMIT" ]]; then
        return
    fi

    function_check set_repo_commit
    set_repo_commit $INSTALL_DIR/pihole "pihole commit" "$PIHOLE_COMMIT" $PIHOLE_REPO

    pihole_copy_files
    pihole_update
}

function backup_local_pihole {
    function_check backup_directory_to_usb
    backup_directory_to_usb $piholeDir pihole
}

function restore_local_pihole {
    function_check restore_directory_from_usb
    restore_directory_from_usb / pihole
}

function backup_remote_pihole {
    function_check backup_directory_to_friend
    backup_directory_to_friend $piholeDir pihole
}

function restore_remote_pihole {
    function_check restore_directory_from_friend
    restore_directory_from_friend / pihole
}

function remove_pihole {
    apt-get -yq remove --purge dnsmasq

    if [ ! -d /var/www/pihole ]; then
        rm -rf /var/www/pihole
    fi

    if [ -f /usr/local/bin/gravity.sh ]; then
        rm /usr/local/bin/gravity.sh
    fi

    if [ -f /usr/local/bin/pihole ]; then
        rm /usr/local/bin/pihole
    fi

    if [ -d /opt/pihole ]; then
        rm -rf /opt/pihole
    fi

    if [ -d $piholeDir ]; then
        rm -rf $piholeDir
    fi

    if [ -d /etc/.pihole ]; then
        rm -rf /etc/.pihole
    fi

    if [ -f /var/log/pihole.log ]; then
        rm /var/log/pihole.log
    fi

    if [ -f /etc/cron.d/pihole ]; then
        rm /etc/cron.d/pihole
    fi

    if [ -d $INSTALL_DIR/pihole ]; then
        rm -rf $INSTALL_DIR/pihole
    fi

    firewall_remove 53
    userdel -r pihole
}

function install_pihole {
    apt-get -yq install dnsmasq curl
    adduser --disabled-login --gecos 'pi-hole' pihole
    if [ ! -d /home/pihole ]; then
        echo $"/home/pihole directory not created"
        exit 538929
    fi

    chmod 600 /etc/shadow
    chmod 600 /etc/gshadow
    usermod -a -G www-data pihole
    chmod 0000 /etc/shadow
    chmod 0000 /etc/gshadow

    systemctl enable dnsmasq

    if [ ! -d $INSTALL_DIR ]; then
        mkdir -p $INSTALL_DIR
    fi

    if [ ! -d $INSTALL_DIR/pihole ]; then
        cd $INSTALL_DIR

        if [ -d /repos/pihole ]; then
            mkdir pihole
            cp -r -p /repos/pihole/. pihole
            cd pihole
            git pull
        else
            git_clone $PIHOLE_REPO pihole
        fi

        if [ ! -d $INSTALL_DIR/pihole ]; then
            exit 523925
        fi
        cd $INSTALL_DIR/pihole
        git checkout $PIHOLE_COMMIT -b $PIHOLE_COMMIT
        set_completion_param "pihole commit" "$PIHOLE_COMMIT"
    fi

    if [ ! -d /var/www/pihole/htdocs ]; then
        mkdir -p /var/www/pihole/htdocs
    fi

    # blank file which takes the place of ads
    echo '<html>' > /var/www/pihole/htdocs/index.html
    echo '<body>' >> /var/www/pihole/htdocs/index.html
    echo '</body>' >> /var/www/pihole/htdocs/index.html
    echo '</html>' >> /var/www/pihole/htdocs/index.html

    if [ ! -f $INSTALL_DIR/pihole/gravity.sh ]; then
        exit 26738
    fi
    cp $INSTALL_DIR/pihole/gravity.sh /usr/local/bin/gravity.sh
    chmod 755 /usr/local/bin/gravity.sh

    if [ ! -f $INSTALL_DIR/pihole/pihole ]; then
        exit 52935
    fi
    cp $INSTALL_DIR/pihole/pihole /usr/local/bin/pihole
    chmod 755 /usr/local/bin/pihole

    if [ ! -d $piholeDir ]; then
        mkdir $piholeDir
    fi
    if [ ! -d /opt/pihole ]; then
        mkdir -p /opt/pihole
    fi

    pihole_copy_files

    chown -R www-data:www-data /var/www/pihole/htdocs

    configure_firewall_for_pihole

    pihole_update

    APP_INSTALLED=1
}

# NOTE: deliberately no exit 0
