#!/bin/bash
#  _____               _           _
# |   __|___ ___ ___ _| |___ _____| |_ ___ ___ ___
# |   __|  _| -_| -_| . | . |     | . | . |   | -_|
# |__|  |_| |___|___|___|___|_|_|_|___|___|_|_|___|
#
#                              Freedom in the Cloud
#
# Installs mesh applications. This avoids duplicated functions
# within freedombone and freedombone-image-customize and also
# for client installs
#
# License
# =======
#
# 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/>.

PROJECT_NAME='freedombone'
COMPLETION_FILE=$HOME/${PROJECT_NAME}-completed.txt

export TEXTDOMAIN=${PROJECT_NAME}-mesh-install
export TEXTDOMAINDIR="/usr/share/locale"

# for mesh installs
TRACKER_PORT=6969

WIFI_CHANNEL=2
WIFI_INTERFACE='wlan0'

# B.A.T.M.A.N settings
BATMAN_CELLID='02:BA:00:00:03:01'
WIFI_SSID='mesh'

rootdir=''
FN=
CHROOT_PREFIX=''

# To avoid confusions these are obtained from the main project file
TOXID_REPO=
TOX_PORT=
TOXCORE_REPO=
TOXIC_REPO=
TOXCORE_COMMIT=
TOXIC_COMMIT=
# These are some default nodes, but you can replace them with trusted nodes
# as you prefer. See https://wiki.tox.im/Nodes
TOX_NODES=
#TOX_NODES=(
#  '192.254.75.102,2607:5600:284::2,33445,951C88B7E75C867418ACDB5D273821372BB5BD652740BCDF623A4FA293E75D2F,Tox RELENG,US'
#  '144.76.60.215,2a01:4f8:191:64d6::1,33445,04119E835DF3E78BACF0F84235B300546AF8B936F035185E2A8E9E0A67C8924F,sonOfRa,DE'
#)

# To avoid confusions these are obtained from the main project file
ZERONET_REPO=
ZERONET_COMMIT=
ZERONET_PORT=

# Directory where source code is downloaded and compiled
INSTALL_DIR=$HOME/build

MESH_INSTALL_DIR=/var/lib

REMOVE='no'

source /usr/share/${PROJECT_NAME}/utils/${PROJECT_NAME}-utils-git

function show_help {
    echo ''
    echo $"${PROJECT_NAME}-mesh-install -f [function] -r [rootdir]"
    echo ''
    echo $'Runs a mesh network install function'
    echo ''
    echo $'  -h --help                   Show help'
    echo $'  -f --function [name]        Name of the function to be run'
    echo $'  -r --rootdir [directory]    Root directory'
    echo $'  -w --wifi [interface]       e.g. wlan0'
    echo ''
    exit 0
}

function mesh_avahi {
    $CHROOT_PREFIX apt-get -yq install avahi-utils avahi-dnsconfd

    decarray=( 1 2 3 4 5 6 7 8 9 0 )
    PEER_ID=${decarray[$RANDOM%10]}${decarray[$RANDOM%10]}${decarray[$RANDOM%10]}${decarray[$RANDOM%10]}${decarray[$RANDOM%10]}${decarray[$RANDOM%10]}${decarray[$RANDOM%10]}${decarray[$RANDOM%10]}
    sed -i "s|#host-name=.*|host-name=P$PEER_ID|g" $rootdir/etc/avahi/avahi-daemon.conf

    if [ ! -d $rootdir/etc/avahi/services ]; then
        mkdir -p $rootdir/etc/avahi/services
    fi

    # remove an avahi service which isn't used
    if [ -f $rootdir/etc/avahi/services/udisks.service ]; then
        rm $rootdir/etc/avahi/services/udisks.service
    fi

    # Add a mesh routing protocol service
    { echo '<?xml version="1.0" standalone="no"?><!--*-nxml-*-->';
      echo '<!DOCTYPE service-group SYSTEM "avahi-service.dtd">';
      echo '<service-group>';
      echo '  <name replace-wildcards="yes">%h routing</name>';
      echo '  <service>';
      echo '    <type>_bmx6._tcp</type>';
      echo '  </service>';
      echo '</service-group>'; } > "$rootdir/etc/avahi/services/routing.service"

    # keep the daemon running
    WATCHDOG_SCRIPT_NAME="keepon"
    { echo '';
    echo '# keep avahi daemon running';
    echo "AVAHI_RUNNING=\$(pgrep avahi-daemon > /dev/null && echo Running)";
    echo "if [ ! \$AVAHI_RUNNING ]; then";
    echo '  systemctl start avahi-daemon';
    echo "  echo -n \$CURRENT_DATE >> \$LOGFILE";
    echo "  echo \" Avahi daemon restarted\" >> \$LOGFILE";
    echo 'fi'; } >> "$rootdir/usr/bin/$WATCHDOG_SCRIPT_NAME"
    chmod +x "$rootdir/usr/bin/$WATCHDOG_SCRIPT_NAME"
}

function install_batman_remove {
    systemctl stop batman
    rm $rootdir/var/lib/batman
    rm $rootdir/etc/systemd/system/batman.service
}

function install_batman {
    $CHROOT_PREFIX apt-get -yq install iproute bridge-utils libnetfilter-conntrack3 batctl
    $CHROOT_PREFIX apt-get -yq install python-dev libevent-dev ebtables python-pip git
    $CHROOT_PREFIX apt-get -yq install wireless-tools rfkill

    if ! grep -q "batman_adv" "$rootdir/etc/modules"; then
        echo 'batman_adv' >> "$rootdir/etc/modules"
    fi
    if ! grep -q "tunnel6" "$rootdir/etc/modules"; then
        echo 'tunnel6' >> "$rootdir/etc/modules"
    fi
    if ! grep -q "ip6_tunnel" "$rootdir/etc/modules"; then
        echo 'ip6_tunnel' >> "$rootdir/etc/modules"
    fi

    BATMAN_SCRIPT=$rootdir/var/lib/batman

    if [ -f /usr/local/bin/${PROJECT_NAME}-mesh-batman ]; then
        cp /usr/local/bin/${PROJECT_NAME}-mesh-batman $BATMAN_SCRIPT
    else
        cp /usr/bin/${PROJECT_NAME}-mesh-batman $BATMAN_SCRIPT
    fi

    BATMAN_DAEMON=$rootdir/etc/systemd/system/batman.service
    { echo '[Unit]';
      echo 'Description=B.A.T.M.A.N. Advanced';
      echo 'After=network.target';
      echo '';
      echo '[Service]';
      echo 'RemainAfterExit=yes';
      echo "ExecStart=/var/lib/batman start";
      echo "ExecStop=/var/lib/batman stop";
      echo 'Restart=on-failure';
      echo 'SuccessExitStatus=3 4';
      echo 'RestartForceExitStatus=3 4';
      echo '';
      echo '# Allow time for the server to start/stop';
      echo 'TimeoutSec=300';
      echo '';
      echo '[Install]';
      echo 'WantedBy=multi-user.target'; } > "$BATMAN_DAEMON"
    $CHROOT_PREFIX systemctl enable batman
}

function mesh_firewall {
    FIREWALL_FILENAME=${rootdir}/etc/systemd/system/meshfirewall.service
    MESH_FIREWALL_SCRIPT=${rootdir}/usr/bin/mesh-firewall

    { echo '#!/bin/bash';
      echo 'iptables -P INPUT ACCEPT';
      echo 'ip6tables -P INPUT ACCEPT';
      echo 'iptables -F';
      echo 'ip6tables -F';
      echo 'iptables -t nat -F';
      echo 'ip6tables -t nat -F';
      echo 'iptables -X';
      echo 'ip6tables -X';
      echo 'iptables -P INPUT DROP';
      echo 'ip6tables -P INPUT DROP';
      echo 'iptables -A INPUT -i lo -j ACCEPT';
      echo 'ip6tables -A INPUT -i lo -j ACCEPT';
      echo 'iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT';
      echo 'ip6tables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT';
      echo '';
      echo '# Make sure incoming tcp connections are SYN packets';
      echo 'iptables -A INPUT -p tcp ! --syn -m state --state NEW -j DROP';
      echo 'ip6tables -A INPUT -p tcp ! --syn -m state --state NEW -j DROP';
      echo '';
      echo '# Drop packets with incoming fragments';
      echo 'iptables -A INPUT -f -j DROP';
      echo 'ip6tables -A INPUT -f -j DROP';
      echo '';
      echo '# Drop bogons';
      echo 'iptables -A INPUT -p tcp --tcp-flags ALL ALL -j DROP';
      echo 'ip6tables -A INPUT -p tcp --tcp-flags ALL ALL -j DROP';
      echo 'iptables -A INPUT -p tcp --tcp-flags ALL FIN,PSH,URG -j DROP';
      echo 'ip6tables -A INPUT -p tcp --tcp-flags ALL FIN,PSH,URG -j DROP';
      echo 'iptables -A INPUT -p tcp --tcp-flags ALL SYN,RST,ACK,FIN,URG -j DROP';
      echo 'ip6tables -A INPUT -p tcp --tcp-flags ALL SYN,RST,ACK,FIN,URG -j DROP';
      echo '';
      echo '# Incoming malformed NULL packets:';
      echo 'iptables -A INPUT -p tcp --tcp-flags ALL NONE -j DROP';
      echo 'ip6tables -A INPUT -p tcp --tcp-flags ALL NONE -j DROP';
      echo '';
      echo "iptables -A INPUT -p tcp --dport $TOX_PORT -j ACCEPT";
      echo "ip6tables -A INPUT -p tcp --dport $TOX_PORT -j ACCEPT";

      echo "iptables -A INPUT -p udp --dport $ZERONET_PORT -j ACCEPT";
      echo "ip6tables -A INPUT -p udp --dport $ZERONET_PORT -j ACCEPT";
      echo "iptables -A INPUT -p tcp --dport $ZERONET_PORT -j ACCEPT";
      echo "ip6tables -A INPUT -p tcp --dport $ZERONET_PORT -j ACCEPT";
      echo "iptables -A INPUT -p udp --dport $TRACKER_PORT -j ACCEPT";
      echo "ip6tables -A INPUT -p udp --dport $TRACKER_PORT -j ACCEPT";
      echo "iptables -A INPUT -p tcp --dport $TRACKER_PORT -j ACCEPT";
      echo "ip6tables -A INPUT -p tcp --dport $TRACKER_PORT -j ACCEPT";
      echo "iptables -A INPUT -p udp --dport 1900 -j ACCEPT";
      echo "ip6tables -A INPUT -p udp --dport 1900 -j ACCEPT";

      echo '# OLSR2/MANET';
      echo 'iptables -A INPUT -p udp --dport 269 -j ACCEPT';
      echo 'ip6tables -A INPUT -p udp --dport 269 -j ACCEPT';
      echo 'iptables -A INPUT -p tcp --dport 138 -j ACCEPT';
      echo 'ip6tables -A INPUT -p tcp --dport 138 -j ACCEPT';

      echo '# Babel';
      echo 'iptables -A INPUT -p udp --dport 6696 -j ACCEPT';
      echo 'ip6tables -A INPUT -p udp --dport 6696 -j ACCEPT'; } > "$MESH_FIREWALL_SCRIPT"
    chmod +x $MESH_FIREWALL_SCRIPT

    { echo '[Unit]';
      echo 'Description=Mesh Firewall';
      echo '';
      echo '[Service]';
      echo 'Type=oneshot';
      echo 'ExecStart=/usr/bin/mesh-firewall';
      echo 'RemainAfterExit=no';
      echo '';
      echo 'TimeoutSec=30';
      echo '';
      echo '[Install]';
      echo 'WantedBy=multi-user.target'; } > $FIREWALL_FILENAME
    chmod +x $FIREWALL_FILENAME
    $CHROOT_PREFIX systemctl enable meshfirewall
}

function enable_tox_repo {
    sudo sh -c "echo 'deb http://download.opensuse.org/repositories/home:/antonbatenev:/tox/Debian_9.0/ /' > /etc/apt/sources.list.d/tox.list"
    wget http://download.opensuse.org/repositories/home:antonbatenev:tox/Debian_9.0/Release.key
    sudo sh -c "apt-key add - < Release.key"
    sudo apt-get update
    echo "Tox Repository Installed."
}

function mesh_tox_client_qtox {
    enable_tox_repo
    sudo apt-get -yq install qtox
    echo "qTox Installed."
}

function mesh_tox_client_toxic_from_repo {
    enable_tox_repo
    sudo apt-get -yq install toxic
    echo "Toxic Installed."
}

while [ $# -gt 1 ]
do
    key="$1"

    case $key in
        -h|--help)
            show_help
            ;;
        -f|--function)
            shift
            FN="$1"
            ;;
        -r|--rootdir)
            shift
            rootdir="$1"
            CHROOT_PREFIX="chroot \"\${rootdir}\""
            ;;
        -w|--wifi|--interface)
            shift
            WIFI_INTERFACE="$1"
            ;;
        --remove)
            shift
            REMOVE="$1"
            ;;
        *)
            # unknown option
            ;;

    esac
    shift
done

if [[ $FN == 'avahi' ]]; then
    mesh_avahi
fi
if [[ $FN == 'firewall' ]]; then
    mesh_firewall
fi
if [[ $FN == 'batman' ]]; then
    if [[ $REMOVE != 'yes' ]]; then
        install_batman
    else
        install_batman_remove
    fi
fi
if [[ $FN == 'qtox' ]]; then
    mesh_tox_client_qtox
fi
if [[ $FN == 'toxic' ]]; then
    mesh_tox_client_toxic_from_repo
fi

exit 0