#!/bin/bash

# dnsmasq DNS server with cache installation on Raspbian 
#
# Copyleft 2017 by Ignacio Nunez Hernanz <nacho _a_t_ ownyourbits _d_o_t_ com>
# GPL licensed (see end of file) * Use at your own risk!
#
# Usage:
# 
#   ./installer.sh dnsmasq.sh <IP> (<img>)
#
# See installer.sh instructions for details
# More at: https://ownyourbits.com/2017/03/09/dnsmasq-as-dns-cache-server-for-nextcloudpi-and-raspbian/
#

ACTIVE_=no
DOMAIN_=mycloud.ownyourbits.com
DNSSERVER_=8.8.8.8
CACHESIZE_=150
DESCRIPTION="DNS server with cache"

INFO="Remember to point your PC and devices DNS or
you router DNS to your Raspberry Pi IP" 

install()
{
  apt-get update
  apt-get install --no-install-recommends -y dnsmasq
  update-rc.d dnsmasq disable

  [[ "$DOCKERBUILD" == 1 ]] && {
    cat > /etc/services-available.d/100dnsmasq <<EOF
#!/bin/bash

source /usr/local/etc/library.sh

[[ "\$1" == "stop" ]] && {
  echo "stopping dnsmasq..."
  service dnsmasq stop
  exit 0
}

persistent_cfg /etc/dnsmasq.conf

echo "Starting dnsmasq..."
service dnsmasq start

exit 0
EOF
    chmod +x /etc/services-available.d/100dnsmasq
  }
}

configure()
{
  [[ $ACTIVE_ != "yes" ]] && { 
    service dnsmasq stop
    update-rc.d dnsmasq disable
    echo "dnmasq disabled"
    return
  }

  local IFACE=$( ip r | grep "default via"   | awk '{ print $5 }' )
  local IP=$( ip a show dev "$IFACE" | grep global | grep -oP '\d{1,3}(.\d{1,3}){3}' | head -1 )

  [[ "$IP" == "" ]] && { echo "could not detect IP"; return 1; }
  
  cat > /etc/dnsmasq.conf <<EOF
interface=$IFACE
domain-needed         # Never forward plain names (without a dot or domain part)
bogus-priv            # Never forward addresses in the non-routed address spaces.
no-poll               # Don't poll for changes in /etc/resolv.conf
no-resolv             # Don't use /etc/resolv.conf or any other file
cache-size=$CACHESIZE_ 
server=$DNSSERVER_
address=/$DOMAIN_/$IP  # This is optional if we add it to /etc/hosts
EOF

  # required to run in container
  test -d /data && echo "user=root" >> /etc/dnsmasq.conf

  sed -i 's|#\?IGNORE_RESOLVCONF=.*|IGNORE_RESOLVCONF=yes|' /etc/default/dnsmasq

  update-rc.d dnsmasq defaults
  update-rc.d dnsmasq enable
  service dnsmasq restart
  cd /var/www/nextcloud
  sudo -u www-data php occ config:system:set trusted_domains 2 --value=$DOMAIN_
  sudo -u www-data php occ config:system:set overwrite.cli.url --value=https://$DOMAIN_
  echo "dnsmasq enabled"
}

# License
#
# This script is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This script 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this script; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place, Suite 330,
# Boston, MA  02111-1307  USA