#!/bin/bash
# Pi-hole: A black hole for Internet advertisements
# (c) 2017 Pi-hole, LLC (https://pi-hole.net)
# Network-wide ad blocking via your own hardware.
#
# Controller for all pihole scripts and functions.
#
# This file is copyright under the latest version of the EUPL.
# Please see LICENSE file for your rights under this license.

readonly PI_HOLE_SCRIPT_DIR="/opt/pihole"
readonly wildcardlist="/etc/dnsmasq.d/03-pihole-wildcard.conf"

# Must be root to use this tool
if [[ ! $EUID -eq 0 ]];then
  if [[ -x "$(command -v sudo)" ]]; then
    exec sudo bash "$0" "$@"
    exit $?
  else
    echo "::: sudo is needed to run pihole commands.  Please run this script as root or install sudo."
    exit 1
  fi
fi

webpageFunc() {
  source /opt/pihole/webpage.sh
  main "$@"
  exit 0
}

whitelistFunc() {
 "${PI_HOLE_SCRIPT_DIR}"/list.sh "$@"
  exit 0
}

blacklistFunc() {
  "${PI_HOLE_SCRIPT_DIR}"/list.sh "$@"
  exit 0
}

wildcardFunc() {
  "${PI_HOLE_SCRIPT_DIR}"/list.sh "$@"
  exit 0
}

debugFunc() {
  local automated
  local web

  # Pull off the `debug` leaving passed call augmentation flags in $1
  shift
  if [[ "$@" == *"-a"* ]]; then
    automated="true"
  fi
  if [[ "$@" == *"-w"* ]]; then
    web="true"
  fi

  AUTOMATED=${automated:-} WEBCALL=${web:-} "${PI_HOLE_SCRIPT_DIR}"/piholeDebug.sh
  exit 0
}

flushFunc() {
  "${PI_HOLE_SCRIPT_DIR}"/piholeLogFlush.sh
  exit 0
}

updatePiholeFunc() {
  "${PI_HOLE_SCRIPT_DIR}"/update.sh
  exit 0
}

reconfigurePiholeFunc() {
  /etc/.pihole/automated\ install/basic-install.sh --reconfigure
  exit 0;
}

updateGravityFunc() {
  "${PI_HOLE_SCRIPT_DIR}"/gravity.sh "$@"
  exit 0
}

scanList() {
  domain="${1}"
  list="${2}"
  method="${3}"

  if [[ "${method}" == "-exact" ]]; then
    grep -i -E -l "(^|\s|\/)${domain}($|\s|\/)" ${list}
  else
    grep -i "${domain}" ${list}
  fi
}

queryFunc() {
  method="${3}"
  
  # If domain contains non ASCII characters, convert domain to punycode if python exists
  # Cr: https://serverfault.com/a/335079
  if [[ -z "${2}" ]]; then
    echo "::: No domain specified"
    exit 1
  elif [[ "${2}" = *[![:ascii:]]* ]]; then
    [[ "$(which python)" ]] && domain=$(python -c 'import sys;print sys.argv[1].decode("utf-8").encode("idna")' "${2}")
  else
    domain="${2}"
  fi
  
  # Scan Whitelist, Blacklist and Wildcards
  lists="/etc/pihole/whitelist.txt /etc/pihole/blacklist.txt $wildcardlist"
  result=$(scanList ${domain} "${lists}" ${method})
  if [[ -n "$result" ]]; then
    echo "$result"
    [[ ! -t 1 ]] && exit 0
  fi

  # Scan Domains lists
  result=$(scanList ${domain} "/etc/pihole/*.domains" ${method})
  if [[ -n "$result" ]]; then
    sort -t . -k 2 -g <<< "$result"
  else
    [ -n "$method" ] && exact="exact "
    echo "::: No ${exact}results found for ${domain}"
  fi
  
  exit 0
}

chronometerFunc() {
  shift
  "${PI_HOLE_SCRIPT_DIR}"/chronometer.sh "$@"
  exit 0
}


uninstallFunc() {
  "${PI_HOLE_SCRIPT_DIR}"/uninstall.sh
  exit 0
}

versionFunc() {
  shift
  "${PI_HOLE_SCRIPT_DIR}"/version.sh "$@"
  exit 0
}

restartDNS() {
  dnsmasqPid=$(pidof dnsmasq)
  if [[ "${dnsmasqPid}" ]]; then
    # Service already running - reload config
    if [[ -x "$(command -v systemctl)" ]]; then
      systemctl restart dnsmasq
    else
      service dnsmasq restart
    fi
  else
    # Service not running, start it up
    if [[ -x "$(command -v systemctl)" ]]; then
      systemctl start dnsmasq
    else
      service dnsmasq start
    fi
  fi
}

piholeEnable() {
  if [[ "${2}" == "-h" ]] || [[ "${2}" == "--help" ]]; then
    echo "Usage: pihole disable [time]
Example: 'pihole disable', or 'pihole disable 5m'
Disable Pi-hole subsystems

Time:
  #s                  Disable Pi-hole functionality for # second(s)
  #m                  Disable Pi-hole functionality for # minute(s)"
    exit 0
  elif [[ "${1}" == "0" ]]; then
    # Disable Pi-hole
    sed -i 's/^addn-hosts=\/etc\/pihole\/gravity.list/#addn-hosts=\/etc\/pihole\/gravity.list/' /etc/dnsmasq.d/01-pihole.conf
    echo "::: Blocking has been disabled!"
    if [[ $# > 1 ]]; then
      if [[ "${2}" == *"s"* ]]; then
        tt=${2%"s"}
        echo "::: Blocking will be re-enabled in ${tt} seconds"
        nohup bash -c "sleep ${tt}; pihole enable" </dev/null &>/dev/null &
      elif [[ "${2}" == *"m"* ]]; then
        tt=${2%"m"}
        echo "::: Blocking will be re-enabled in ${tt} minutes"
        tt=$((${tt}*60))
        nohup bash -c "sleep ${tt}; pihole enable" </dev/null &>/dev/null &
      else
        echo "::: Unknown format for delayed reactivation of the blocking!"
        echo "::: Example:"
        echo ":::    pihole disable 5s    -    will disable blocking for 5 seconds"
        echo ":::    pihole disable 7m    -    will disable blocking for 7 minutes"
        echo "::: Blocking will not automatically be re-enabled!"
      fi
    fi
  else
    # Enable Pi-hole
    echo "::: Blocking has been enabled!"
    sed -i 's/^#addn-hosts/addn-hosts/' /etc/dnsmasq.d/01-pihole.conf
  fi
  restartDNS
}

piholeLogging() {
  shift
  if [[ "${1}" == "-h" ]] || [[ "${1}" == "--help" ]]; then
    echo "Usage: pihole logging [options]
Example: 'pihole logging on'
Specify whether the Pi-hole log should be used

Options:
  on                  Enable the Pi-hole log at /var/log/pihole.log
  off                 Disable the Pi-hole log at /var/log/pihole.log"
    exit 0
  elif [[ "${1}" == "off" ]]; then
    # Disable logging
    sed -i 's/^log-queries/#log-queries/' /etc/dnsmasq.d/01-pihole.conf
    sed -i 's/^QUERY_LOGGING=true/QUERY_LOGGING=false/' /etc/pihole/setupVars.conf
    pihole -f
    echo "::: Logging has been disabled!"
  elif [[ "${1}" == "on" ]]; then
    # Enable logging
    sed -i 's/^#log-queries/log-queries/' /etc/dnsmasq.d/01-pihole.conf
    sed -i 's/^QUERY_LOGGING=false/QUERY_LOGGING=true/' /etc/pihole/setupVars.conf
    echo "::: Logging has been enabled!"
  else
    echo "::: Invalid option passed, please pass 'on' or 'off'"
    exit 1
  fi
  restartDNS
}

piholeStatus() {
  if [[ "$(netstat -plnt | grep -c ':53 ')" -gt "0" ]]; then
    if [[ "${1}" != "web" ]]; then
      echo "::: DNS service is running"
    fi
  else
    if [[ "${1}" == "web" ]]; then
      echo "-1";
    else
      echo "::: DNS service is NOT running"
    fi
    return
  fi

  if [[ "$(grep -i "^#addn-hosts=/" /etc/dnsmasq.d/01-pihole.conf)" ]]; then
    # List is commented out
    if [[ "${1}" == "web" ]]; then
      echo 0;
    else
      echo "::: Pi-hole blocking is Disabled";
    fi
  elif [[ "$(grep -i "^addn-hosts=/" /etc/dnsmasq.d/01-pihole.conf)" ]]; then
    # List set
    if [[ "${1}" == "web" ]]; then
      echo 1;
    else
      echo "::: Pi-hole blocking is Enabled";
    fi
  else
    # Addn-host not found
    if [[ "${1}" == "web" ]]; then
      echo 99
    else
      echo ":::  No hosts file linked to dnsmasq, adding it in enabled state"
    fi
    # Add addn-host= to dnsmasq
    echo "addn-hosts=/etc/pihole/gravity.list" >> /etc/dnsmasq.d/01-pihole.conf
    restartDNS
  fi
}

tailFunc() {
  echo "Press Ctrl-C to exit"
  tail -F /var/log/pihole.log
  exit 0
}

piholeCheckoutFunc() {
  if [[ "$2" == "-h" ]]; then
    echo "Usage: pihole checkout [repo] [branch]
Example: 'pihole checkout master' or 'pihole checkout core dev'
Switch Pi-hole subsystems to a different Github branch

Repositories:
  core [branch]       Change the branch of Pi-hole's core subsystem
  web [branch]        Change the branch of Admin Console subsystem
  
Branches:
  master              Update subsystems to the latest stable release
  dev                 Update subsystems to the latest development release"
    exit 0
  fi

  source "${PI_HOLE_SCRIPT_DIR}"/piholeCheckout.sh
  shift
  checkout "$@"
}

helpFunc() {
  echo "Usage: pihole [options]
Example: 'pihole -w -h'
Add '-h' after specific commands for more information on usage
  
Whitelist/Blacklist Options:
  -w, whitelist       Whitelist domain(s)
  -b, blacklist       Blacklist domain(s)
  -wild, wildcard     Blacklist domain(s), and all its subdomains
                        Add '-h' for more info on whitelist/blacklist usage

Debugging Options:
  -d, debug           Start a debugging session
                        Add '-a' to enable automated debugging
  -f, flush           Flush the Pi-hole log
  -r, reconfigure     Reconfigure or Repair Pi-hole subsystems
  -t, tail            View the live output of the Pi-hole log

Options:
  -a, admin           Admin Console options
                        Add '-h' for more info on admin console usage
  -c, chronometer     Calculates stats and displays to an LCD
                        Add '-h' for more info on chronometer usage
  -g, updateGravity   Update the list of ad-serving domains
  -h, --help, help    Show this help dialog
  -l, logging         Specify whether the Pi-hole log should be used
                        Add '-h' for more info on logging usage
  -q, query           Query the adlists for a specified domain
                        Add '-exact' AFTER a specified domain for exact match
  -up, updatePihole   Update Pi-hole subsystems        
  -v, version         Show installed versions of Pi-hole, Admin Console & FTL
                        Add '-h' for more info on version usage                         
  uninstall           Uninstall Pi-hole from your system
  status              Display the running status of Pi-hole subsystems
  enable              Enable Pi-hole subsystems
  disable             Disable Pi-hole subsystems
                        Add '-h' for more info on disable usage
  restartdns          Restart Pi-hole subsystems
  checkout            Switch Pi-hole subsystems to a different Github branch
                        Add '-h' for more info on checkout usage";
  exit 0
}

if [[ $# = 0 ]]; then
  helpFunc
fi

# Handle redirecting to specific functions based on arguments
case "${1}" in
  "-w" | "whitelist"            ) whitelistFunc "$@";;
  "-b" | "blacklist"            ) blacklistFunc "$@";;
  "-wild" | "wildcard"          ) wildcardFunc "$@";;
  "-d" | "debug"                ) debugFunc "$@";;
  "-f" | "flush"                ) flushFunc;;
  "-up" | "updatePihole"        ) updatePiholeFunc;;
  "-r"  | "reconfigure"         ) reconfigurePiholeFunc;;
  "-g" | "updateGravity"        ) updateGravityFunc "$@";;
  "-c" | "chronometer"          ) chronometerFunc "$@";;
  "-h" | "help"                 ) helpFunc;;
  "-v" | "version"              ) versionFunc "$@";;
  "-q" | "query"                ) queryFunc "$@";;
  "-l" | "logging"              ) piholeLogging "$@";;
  "uninstall"                   ) uninstallFunc;;
  "enable"                      ) piholeEnable 1;;
  "disable"                     ) piholeEnable 0 "$2";;
  "status"                      ) piholeStatus "$2";;
  "restartdns"                  ) restartDNS;;
  "-a" | "admin"                ) webpageFunc "$@";;
  "-t" | "tail"                 ) tailFunc;;
  "checkout"                    ) piholeCheckoutFunc "$@";;
  *                             ) helpFunc;;
esac