#!/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"
readonly colfile="${PI_HOLE_SCRIPT_DIR}/COL_TABLE"

source ${colfile}

# 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 -e "  ${CROSS} 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
}

# Scan an array of files for matching strings
scanList(){
  local domain="${1}" lists="${2}" type="${3:-}"

  # Prevent grep from printing file path
  cd "/etc/pihole" || exit 1

  # Prevent grep -i matching slowly: http://bit.ly/2xFXtUX
  export LC_CTYPE=C

  # /dev/null forces filename to be printed when only one list has been generated
  # shellcheck disable=SC2086
  case "${type}" in
    "exact" ) grep -i -E -l "(^|\\s)${domain}($|\\s|#)" ${lists} /dev/null;;
    "wc"    ) grep -i -o -m 1 "/${domain}/" ${lists};;
    *       ) grep -i "${domain}" ${lists} /dev/null;;
  esac
}

# Print each subdomain
# e.g: foo.bar.baz.com = "foo.bar.baz.com bar.baz.com baz.com com"
processWildcards() {
  IFS="." read -r -a array <<< "${1}"
  for (( i=${#array[@]}-1; i>=0; i-- )); do
    ar=""
    for (( j=${#array[@]}-1; j>${#array[@]}-i-2; j-- )); do
      if [[ $j == $((${#array[@]}-1)) ]]; then
        ar="${array[$j]}"
      else
        ar="${array[$j]}.${ar}"
      fi
    done
    echo "${ar}"
  done
}

queryFunc() {
  shift
  local options="$*" adlist="" all="" exact="" blockpage="" matchType="match"

  if [[ "${options}" == "-h" ]] || [[ "${options}" == "--help" ]]; then
    echo "Usage: pihole -q [option] <domain>
Example: 'pihole -q -exact domain.com'
Query the adlists for a specified domain

Options:
  -adlist             Print the name of the block list URL
  -exact              Search the block lists for exact domain matches
  -all                Return all query matches within a block list
  -h, --help          Show this help dialog"
    exit 0
  fi

  if [[ ! -e "/etc/pihole/adlists.list" ]]; then
    echo -e "${COL_LIGHT_RED}The file '/etc/pihole/adlists.list' was not found${COL_NC}"
    exit 1
  fi

  # Handle valid options
  if [[ "${options}" == *"-bp"* ]]; then
    exact="exact"; blockpage=true
  else
    [[ "${options}" == *"-adlist"* ]] && adlist=true
    [[ "${options}" == *"-all"* ]] && all=true
    if [[ "${options}" == *"-exact"* ]]; then
      exact="exact"; matchType="exact ${matchType}"
    fi
  fi

  # Strip valid options, leaving only the domain and invalid options
  # This allows users to place the options before or after the domain
  options=$(sed -E 's/ ?-(bp|adlists?|all|exact)//g' <<< "${options}")

  # Handle remaining options
  # If $options contain non ASCII characters, convert to punycode
  case "${options}" in
    ""             ) str="No domain specified";;
    *" "*          ) str="Unknown query option specified";;
    *[![:ascii:]]* ) domainQuery=$(idn2 "${options}");;
    *              ) domainQuery="${options}";;
  esac

  if [[ -n "${str:-}" ]]; then
    echo -e "${str}${COL_NC}\\nTry 'pihole -q --help' for more information."
    exit 1
  fi

  # Scan Whitelist and Blacklist
  lists="whitelist.txt blacklist.txt"
  mapfile -t results <<< "$(scanList "${domainQuery}" "${lists}" "${exact}")"

  if [[ -n "${results[*]}" ]]; then
    wbMatch=true

    # Loop through each result in order to print unique file title once
    for result in "${results[@]}"; do
      fileName="${result%%.*}"

      if [[ -n "${blockpage}" ]]; then
        echo "π ${result}"
        exit 0
      elif [[ -n "${exact}" ]]; then
        echo " ${matchType^} found in ${COL_BOLD}${fileName^}${COL_NC}"
      else
        # Only print filename title once per file
        if [[ ! "${fileName}" == "${fileName_prev:-}" ]]; then
          echo " ${matchType^} found in ${COL_BOLD}${fileName^}${COL_NC}"
          fileName_prev="${fileName}"
        fi
        echo "   ${result#*:}"
      fi
    done
  fi

  # Scan Wildcards
  if [[ -e "${wildcardlist}" ]]; then
    # Determine all subdomains, domain and TLDs 
    mapfile -t wildcards <<< "$(processWildcards "${domainQuery}")"

    for match in "${wildcards[@]}"; do
      # Search wildcard list for matches
      mapfile -t results <<< "$(scanList "${match}" "${wildcardlist}" "wc")"

      if [[ -n "${results[*]}" ]]; then
        if [[ -z "${wcMatch:-}" ]] && [[ -z "${blockpage}" ]]; then
          wcMatch=true
          echo " ${matchType^} found in ${COL_BOLD}Wildcards${COL_NC}:"
        fi

        case "${blockpage}" in
          true ) echo "π ${wildcardlist##*/}"; exit 0;;
          *    ) echo "   *.${match}";;
        esac
      fi
    done
  fi

  # Get version sorted *.domains filenames (without dir path)
  lists=("$(cd "/etc/pihole" || exit 0; printf "%s\\n" -- *.domains | sort -V)")

  # Query blocklists for occurences of domain
  mapfile -t results <<< "$(scanList "${domainQuery}" "${lists[*]}" "${exact}")"

  # Handle notices
  if [[ -z "${wbMatch:-}" ]] && [[ -z "${wcMatch:-}" ]] && [[ -z "${results[*]}" ]]; then
    echo -e "  ${INFO} No ${exact/t/t }results found for ${COL_BOLD}${domainQuery}${COL_NC} found within block lists"
    exit 0
  elif [[ -z "${results[*]}" ]]; then
    # Result found in WL/BL/Wildcards
    exit 0
  elif [[ -z "${all}" ]] && [[ "${#results[*]}" -ge 100 ]]; then
    echo -e "  ${INFO} Over 100 ${exact/t/t }results found for ${COL_BOLD}${domainQuery}${COL_NC}
      This can be overridden using the -all option"
    exit 0
  fi

  # Remove unwanted content from non-exact $results
  if [[ -z "${exact}" ]]; then
    # Delete lines starting with #
    # Remove comments after domain
    # Remove hosts format IP address
    mapfile -t results <<< "$(IFS=$'\n'; sed \
      -e "/:#/d" \
      -e "s/[ \\t]#.*//g" \
      -e "s/:.*[ \\t]/:/g" \
    <<< "${results[*]}")"

    # Exit if result was in a comment
    [[ -z "${results[*]}" ]] && exit 0
  fi

  # Get adlist file content as array
  if [[ -n "${adlist}" ]] || [[ -n "${blockpage}" ]]; then
    for adlistUrl in $(< "/etc/pihole/adlists.list"); do
      if [[ "${adlistUrl:0:4}" =~ (http|www.) ]]; then
        adlists+=("${adlistUrl}")
      fi
    done
  fi

  # Print "Exact matches for" title
  if [[ -n "${exact}" ]] && [[ -z "${blockpage}" ]]; then
    plural=""; [[ "${#results[*]}" -gt 1 ]] && plural="es"
    echo " ${matchType^}${plural} for ${COL_BOLD}${domainQuery}${COL_NC} found in:"
  fi

  for result in "${results[@]}"; do
    fileName="${result/:*/}"

    # Determine *.domains URL using filename's number
    if [[ -n "${adlist}" ]] || [[ -n "${blockpage}" ]]; then
      fileNum="${fileName/list./}"; fileNum="${fileNum%%.*}"
      fileName="${adlists[$fileNum]}"

      # Discrepency occurs when adlists has been modified, but Gravity has not been run
      if [[ -z "${fileName}" ]]; then
        fileName="${COL_LIGHT_RED}(no associated adlists URL found)${COL_NC}"
      fi
    fi

    if [[ -n "${blockpage}" ]]; then
      echo "${fileNum} ${fileName}"
    elif [[ -n "${exact}" ]]; then
      echo "   ${fileName}"
    else
      if [[ ! "${fileName}" == "${fileName_prev:-}" ]]; then
        count=""
        echo " ${matchType^} found in ${COL_BOLD}${fileName}${COL_NC}:"
        fileName_prev="${fileName}"
      fi
      : $((count++))

      # Print matching domain if $max_count has not been reached
      [[ -z "${all}" ]] && max_count="50"
      if [[ -z "${all}" ]] && [[ "${count}" -ge "${max_count}" ]]; then
        [[ "${count}" -gt "${max_count}" ]] && continue
        echo "   ${COL_GRAY}Over ${count} results found, skipping rest of file${COL_NC}"
      else
        echo "   ${result#*:}"
      fi
    fi
  done

  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)
  local str="Restarting DNS service"
  echo -ne "  ${INFO} ${str}"
  if [[ "${dnsmasqPid}" ]]; then
    # Service already running - reload config
    if [[ -x "$(command -v systemctl)" ]]; then
      output=$( { systemctl restart dnsmasq; } 2>&1 )
    else
      output=$( { service dnsmasq restart; } 2>&1 )
    fi
    if [[ -z "${output}" ]]; then
      echo -e "${OVER}  ${TICK} ${str}"
    else
      echo -e "${OVER}  ${CROSS} ${output}"
    fi
  else
    # Service not running, start it up
    if [[ -x "$(command -v systemctl)" ]]; then
      output=$( { systemctl start dnsmasq; } 2>&1 )
    else
      output=$( { service dnsmasq start; } 2>&1 )
    fi
    if [[ -z "${output}" ]]; then
      echo -e "${OVER}  ${TICK} ${str}"
    else
      echo -e "${OVER}  ${CROSS} ${output}"
    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 [[ "${1}" == "0" ]]; then
    # Disable Pi-hole
    sed -i 's/^addn-hosts=\/etc\/pihole\/gravity.list/#addn-hosts=\/etc\/pihole\/gravity.list/' /etc/dnsmasq.d/01-pihole.conf
    sed -i 's/^addn-hosts=\/etc\/pihole\/black.list/#addn-hosts=\/etc\/pihole\/black.list/' /etc/dnsmasq.d/01-pihole.conf
    if [[ -e "$wildcardlist" ]]; then
      mv "$wildcardlist" "/etc/pihole/wildcard.list"
    fi
    if [[ $# > 1 ]]; then
      local error=false
      if [[ "${2}" == *"s" ]]; then
        tt=${2%"s"}
        if [[ "${tt}" =~ ^-?[0-9]+$ ]];then
          local str="Disabling blocking for ${tt} seconds"
          echo -e "  ${INFO} ${str}..."
          local str="Blocking will be re-enabled in ${tt} seconds"
          nohup bash -c "sleep ${tt}; pihole enable" </dev/null &>/dev/null &
        else
          local error=true
        fi
      elif [[ "${2}" == *"m" ]]; then
        tt=${2%"m"}
          if [[ "${tt}" =~ ^-?[0-9]+$ ]];then
          local str="Disabling blocking for ${tt} minutes"
          echo -e "  ${INFO} ${str}..."
          local str="Blocking will be re-enabled in ${tt} minutes"
          tt=$((${tt}*60))
          nohup bash -c "sleep ${tt}; pihole enable" </dev/null &>/dev/null &
        else
          local error=true
        fi
      elif [[ -n "${2}" ]]; then
        local error=true
      else
        echo -e "  ${INFO} Disabling blocking"
      fi

      if [[ ${error} == true ]];then
        echo -e "  ${COL_LIGHT_RED}Unknown format for delayed reactivation of the blocking!${COL_NC}"
        echo -e "  Try 'pihole disable --help' for more information."
        exit 1
      fi

      local str="Pi-hole Disabled"
    fi
  else
    # Enable Pi-hole
    echo -e "  ${INFO} Enabling blocking"
    local str="Pi-hole Enabled"

    sed -i 's/^#addn-hosts/addn-hosts/' /etc/dnsmasq.d/01-pihole.conf
    if [[ -e "/etc/pihole/wildcard.list" ]]; then
      mv "/etc/pihole/wildcard.list" "$wildcardlist"
    fi
  fi

  restartDNS

  echo -e "${OVER}  ${TICK} ${str}"
}

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 -e "  ${INFO} Disabling logging..."
    local str="Logging has been disabled!"
  elif [[ "${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 -e "  ${INFO} Enabling logging..."
    local str="Logging has been enabled!"
  else
    echo -e "  ${COL_LIGHT_RED}Invalid option${COL_NC}
  Try 'pihole logging --help' for more information."
    exit 1
  fi
  restartDNS
  echo -e "${OVER}  ${TICK} ${str}"
}

statusFunc() {
  local addnConfigs

  # Determine if service is running on port 53 (Cr: https://superuser.com/a/806331)
  if (echo > /dev/tcp/localhost/53) >/dev/null 2>&1; then
    if [[ "${1}" != "web" ]]; then
      echo -e "  ${TICK} DNS service is running"
    fi
  else
    case "${1}" in
      "web") echo "-1";;
      *) echo -e "  ${CROSS} DNS service is NOT running";;
    esac
    return 0
  fi

  # Determine if Pi-hole's addn-hosts configs are commented out
  addnConfigs=$(grep -i "addn-hosts=/" /etc/dnsmasq.d/01-pihole.conf)
  
  if [[ "${addnConfigs}" =~ "#" ]]; then
    # A config is commented out
    case "${1}" in
      "web") echo 0;;
      *) echo -e "  ${CROSS} Pi-hole blocking is Disabled";;
    esac
  elif [[ -n "${addnConfigs}" ]]; then
    # Configs are set
    case "${1}" in
      "web") echo 1;;
      *) echo -e "  ${TICK} Pi-hole blocking is Enabled";;
    esac
  else
    # No configs were found
    case "${1}" in
      "web") echo 99;;
      *) echo -e "  ${INFO} No hosts file linked to dnsmasq, adding it in enabled state";;
    esac
    # Add addn-host= to dnsmasq
    echo "addn-hosts=/etc/pihole/gravity.list" >> /etc/dnsmasq.d/01-pihole.conf
    restartDNS
  fi
}

tailFunc() {
  date=$(date +'%b %d ')
  echo -e "  ${INFO} Press Ctrl-C to exit"
  tail -f /var/log/pihole.log | sed \
    -e "s,\(${date}\| dnsmasq\[.*[0-9]]\),,g" \
    -e "s,\(.*\(gravity.list\|black.list\| config \).* is \(${IPV4_ADDRESS%/*}\|${IPV6_ADDRESS:-NULL}\).*\),${COL_LIGHT_RED}&${COL_NC}," \
    -e "s,.*\(query\[A\|DHCP\).*,${COL_NC}&${COL_NC}," \
    -e "s,.*,${COL_DARK_GRAY}&${COL_NC},"
  exit 0
}

piholeCheckoutFunc() {
  if [[ "$2" == "-h" ]] || [[ "$2" == "--help" ]]; 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
  ftl [branch]        Change the branch of Pi-hole's FTL subsystem

Branches:
  master              Update subsystems to the latest stable release
  dev                 Update subsystems to the latest development release"
    exit 0
  fi

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

tricorderFunc() {
  if [[ ! -p "/dev/stdin" ]]; then
    echo -e "  ${INFO} Please do not call Tricorder directly"
    exit 1
  fi

  if ! (echo > /dev/tcp/tricorder.pi-hole.net/9998) >/dev/null 2>&1; then
    echo -e "  ${CROSS} Unable to connect to Pi-hole's Tricorder server"
    exit 1
  fi

  if command -v openssl &> /dev/null; then
    openssl s_client -quiet -connect tricorder.pi-hole.net:9998 2> /dev/null < /dev/stdin
    exit "$?"
  else
    echo -e "  ${INFO} ${COL_YELLOW}Security Notice${COL_NC}: ${COL_WHITE}openssl${COL_NC} is not installed
       Your debug log will be transmitted unencrypted via plain-text
       There is a possibility that this could be intercepted by a third party
       If you wish to cancel, press Ctrl-C to exit within 10 seconds"
    secs="10"
    while [[ "$secs" -gt "0" ]]; do
       echo -ne "."
       sleep 1
       : $((secs--))
    done
    echo " "
    nc tricorder.pi-hole.net 9999 < /dev/stdin
    exit "$?"
  fi
}

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 '-h' for more info on query usage
  -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"                      ) statusFunc "$2";;
  "restartdns"                  ) restartDNS;;
  "-a" | "admin"                ) webpageFunc "$@";;
  "-t" | "tail"                 ) tailFunc;;
  "checkout"                    ) piholeCheckoutFunc "$@";;
  "tricorder"                   ) tricorderFunc;;
  *                             ) helpFunc;;
esac