#!/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
}

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

  # Switch folder, preventing grep from printing file path
  cd "/etc/pihole" || return 1

  if [[ -n "${method}" ]]; then
    grep -i -E -l "(^|\s|\/)${domain}($|\s|\/)" ${list} /dev/null 2> /dev/null
  else
    grep -i "${domain}" ${list} /dev/null 2> /dev/null
  fi
}

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() {
  options="$*"
  options="${options/-q /}"

  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 [[ "${options}" == *"-exact"* ]]; then
    method="exact"
    exact=true
  fi

  if [[ "${options}" == *"-adlist"* ]]; then
    adlist=true
  fi

  if [[ "${options}" == *"-bp"* ]]; then
    method="exact"
    blockpage=true
  fi

  if [[ "${options}" == *"-all"* ]]; then
    all=true
  fi

  # Strip valid options, leaving only the domain and invalid options
  options=$(sed 's/ \?-\(exact\|adlist\(s\)\?\|bp\|all\) \?//g' <<< "$options")

  # Handle errors
  if [[ "${options}" == *" "* ]]; then
    error=true
    str="Unknown option specified"
  elif [[ "${options}" == "-q" ]]; then
    error=true
    str="No domain specified"
  fi

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

  # If domain contains non ASCII characters, convert domain to punycode if python is available
  # Cr: https://serverfault.com/a/335079
  if [[ "$options" = *[![:ascii:]]* ]]; then
    if command -v python &> /dev/null; then
      query=$(python -c 'import sys;print sys.argv[1].decode("utf-8").encode("idna")' "${options}")
    fi
  else
    query="${options}"
  fi

  # Scan Whitelist and Blacklist
  lists="whitelist.txt blacklist.txt"
  results=($(scanList "${query}" "${lists}" "${method}"))

  if [[ -n "${results[*]}" ]]; then
    blResult=true
    # Loop through each scanList line to print appropriate title
    for result in "${results[@]}"; do
      filename="${result/:*/}"
      if [[ -n "$exact" ]]; then
        printf "  Exact result in %s\n" "${filename}"
      elif [[ -n "$blockpage" ]]; then
        printf "π %s\n" "${filename}"
      else
        domain="${result/*:/}"
        if [[ ! "${filename}" == "${filename_prev:-}" ]]; then
          printf "  Result from %s\n" "${filename}"
        fi
        printf "    %s\n" "${domain}"
        filename_prev="${filename}"
      fi
    done
  fi

  # Scan Wildcards
  if [[ -e "${wildcardlist}" ]]; then
    wildcards=($(processWildcards "${query}"))

    for match in "${wildcards[@]}"; do
      results=($(scanList "\/${match}\/" ${wildcardlist}))

      if [[ -n "${results[*]}" ]]; then
        # Remove empty lines before couting number of results
        count=$(sed '/^\s*$/d' <<< "${results[@]}" | wc -l)
        if [[ "${count}" -ge 0 ]]; then
          blResult=true
          if [[ -z "${blockpage}" ]]; then
            printf "  Wildcard result in %s\n" "${wildcardlist/*dnsmasq.d\/}"
          fi

          if [[ -n "${blockpage}" ]]; then
            echo "π ${wildcardlist/*\/}"
          else
            echo "    *.${match}"
          fi
        fi
      fi
    done

    [[ -n "${blResult}" ]] && [[ -n "${blockpage}" ]] && exit 0
  fi

  # Glob *.domains file names, remove file paths and sort by list number
  lists_raw=(/etc/pihole/*.domains)
  IFS_OLD=$IFS
  IFS=$'\n'
  lists=$(sort -t . -k 2 -g <<< "${lists_raw[*]//\/etc\/pihole\//}")

  # Scan Domains files
  results=($(scanList "${query}" "${lists}" "${method}"))

  # Handle notices
  if [[ -z "${blResult}" ]] && [[ -z "${results[*]}" ]]; then
    notice=true
    str="No ${method/t/t }results found for ${query} found within block lists"
  elif [[ -z "${all}" ]] && [[ "${#results[*]}" -ge 16000 ]]; then
    # 16000 chars is 15 chars X 1000 lines worth of results
    notice=true
    str="Hundreds of ${method/t/t }results found for ${query}
    This can be overriden using the -all option"
  fi

  if [[ -n "${notice}" ]]; then
    echo -e "  ${INFO} ${str}"
    exit
  fi

  # Remove unwanted content from results
  if [[ -z "${method}" ]]; then
    results=($(sed "/:#/d" <<< "${results[*]}")) # Lines starting with comments
    results=($(sed "s/[ \t]#.*//g" <<< "${results[*]}")) # Comments after domain
    results=($(sed "s/:.*[ \t]/:/g" <<< "${results[*]}")) # IP address
  fi
  IFS=$IFS_OLD

  # Get adlist content as array
  if [[ -n "${adlist}" ]] || [[ -n "${blockpage}" ]]; then
    if [[ -f "/etc/pihole/adlists.list" ]]; then
      for url in $(< /etc/pihole/adlists.list); do
        if [[ "${url:0:4}" == "http" ]] || [[ "${url:0:3}" == "www" ]]; then
          adlists+=("$url")
        fi
      done
    else
      echo -e "  ${COL_LIGHT_RED}The file '/etc/pihole/adlists.list' was not found${COL_NC}"
      exit 1
    fi
  fi

  if [[ -n "${results[*]}" ]]; then
    if [[ -n "${exact}" ]]; then
      echo "  Exact result(s) for ${query} found in:"
    fi

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

      # Convert file name to URL name for -adlist or -bp options
      if [[ -n "${adlist}" ]] || [[ -n "${blockpage}" ]]; then
        filenum=("${filename/list./}")
        filenum=("${filenum/.*/}")
        filename="${adlists[$filenum]}"

        # If gravity has generated associated .domains files
        # but adlists.list has been modified since
        if [[ -z "${filename}" ]]; then
          filename="${COL_LIGHT_RED}Error: no associated adlists URL found${COL_NC}"
        fi
      fi

      if [[ -n "${exact}" ]]; then
        printf "    %s\n" "${filename}"
      elif [[ -n "${blockpage}" ]]; then
        printf "%s %s\n" "${filenum}" "${filename}"
      else # Standard query output

        # Print filename heading once per file, not for every match
        if [[ ! "${filename}" == "${filename_prev:-}" ]]; then
          unset count
          printf "  Result from %s\n" "${filename}"
        else
          let count++
        fi

        # Print matching domain if $max_count has not been reached
        [[ -z "${all}" ]] && max_count="20"
        if [[ -z "${all}" ]] && [[ "${count}" -eq "${max_count}" ]]; then
          echo "    Over $count results found, skipping rest of file"
        elif [[ -z "${all}" ]] && [[ "${count}" -gt "${max_count}" ]]; then
          continue
        else
          domain="${result/*:/}"
          printf "    %s\n" "${domain}"
        fi
        filename_prev="${filename}"
      fi
    done
  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)
  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