#!/usr/bin/env 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"

# PI_HOLE_BIN_DIR is not readonly here because in some functions (checkout),
# they might get set again when the installer is sourced. This causes an
# error due to modifying a readonly variable.
PI_HOLE_BIN_DIR="/usr/local/bin"

readonly colfile="${PI_HOLE_SCRIPT_DIR}/COL_TABLE"
source "${colfile}"

readonly utilsfile="${PI_HOLE_SCRIPT_DIR}/utils.sh"
source "${utilsfile}"

# Source api functions
readonly apifile="${PI_HOLE_SCRIPT_DIR}/api.sh"
source "${apifile}"

versionsfile="/etc/pihole/versions"
if [ -f "${versionsfile}" ]; then
    # Only source versionsfile if the file exits
    # fixes a warning during installation where versionsfile does not exist yet
    # but gravity calls `pihole -status` and thereby sourcing the file
    source "${versionsfile}"
fi

# TODO: We can probably remove the reliance on this function too, just tell people to pihole-FTL --config webserver.api.password "password"
SetWebPassword() {
    if [ -n "$2" ] ; then
        readonly PASSWORD="$2"
        readonly CONFIRM="${PASSWORD}"
    else
        # Prevents a bug if the user presses Ctrl+C and it continues to hide the text typed.
        # So we reset the terminal via stty if the user does press Ctrl+C
        trap '{ echo -e "\nNot changed" ; stty sane ; exit 1; }' INT
        read -s -r -p "Enter New Password (Blank for no password): " PASSWORD
        echo ""

        if [ "${PASSWORD}" == "" ]; then
            setFTLConfigValue "webserver.api.password" ""
            echo -e "  ${TICK} Password Removed"
            exit 0
        fi

        read -s -r -p "Confirm Password: " CONFIRM
        echo ""
    fi

    if [ "${PASSWORD}" == "${CONFIRM}" ] ; then
        # pihole-FTL will automatically hash the password
        setFTLConfigValue "webserver.api.password" "${PASSWORD}"
        echo -e "  ${TICK} New password set"
    else
        echo -e "  ${CROSS} Passwords don't match. Your password has not been changed"
        exit 1
    fi
}

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

debugFunc() {
    local automated
    local web
    local check_database_integrity
    # Pull off the `debug` leaving passed call augmentation flags in $1
    shift

    for value in "$@"; do
        [[ "$value"  == *"-a"* ]] && automated="true"
        [[ "$value"  == *"-w"* ]] && web="true"
        [[ "$value"  == *"-c"* ]] && check_database_integrity="true"
        [[ "$value" == *"--check_database"* ]] && check_database_integrity="true"
    done

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

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

arpFunc() {
  "${PI_HOLE_SCRIPT_DIR}"/piholeARPTable.sh "$@"
  exit 0
}

updatePiholeFunc() {
  if [ -n "${DOCKER_VERSION}" ]; then
    unsupportedFunc
  else
    shift
    "${PI_HOLE_SCRIPT_DIR}"/update.sh "$@"
    exit 0
  fi
}

reconfigurePiholeFunc() {
  if [ -n "${DOCKER_VERSION}" ]; then
    unsupportedFunc
  else
    /etc/.pihole/automated\ install/basic-install.sh --reconfigure
    exit 0;
  fi
}

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

queryFunc() {
  shift
  "${PI_HOLE_SCRIPT_DIR}"/query.sh "$@"
  exit 0
}

chronometerFunc() {
  echo "Chronometer is gone, use PADD (https://github.com/pi-hole/PADD)"
  exit 0
}


uninstallFunc() {
  if [ -n "${DOCKER_VERSION}" ]; then
    unsupportedFunc
  else
    "${PI_HOLE_SCRIPT_DIR}"/uninstall.sh
    exit 0
  fi
}

versionFunc() {
  exec "${PI_HOLE_SCRIPT_DIR}"/version.sh
}

reloadDNS() {
  local svcOption svc str output status pid icon FTL_PID_FILE
  svcOption="${1:-reload}"

  # get the current path to the pihole-FTL.pid
  FTL_PID_FILE="$(getFTLConfigValue files.pid)"

  # Determine if we should reload or restart
  if [[ "${svcOption}" =~ "reload-lists" ]]; then
    # Reloading of the lists has been requested
    # Note 1: This will NOT re-read any *.conf files
    # Note 2: We cannot use killall here as it does
    #         not know about real-time signals

    pid="$(getFTLPID ${FTL_PID_FILE})"
    if [[ "$pid" -eq "-1" ]]; then
      svc="true"
      str="FTL is not running"
      icon="${INFO}"
    else
      svc="kill -RTMIN ${pid}"
      str="Reloading DNS lists"
      icon="${TICK}"
    fi
  elif [[ "${svcOption}" =~ "reload" ]]; then
    # Reloading of the DNS cache has been requested
    # Note: This will NOT re-read any *.conf files
    pid="$(getFTLPID ${FTL_PID_FILE})"
    if [[ "$pid" -eq "-1" ]]; then
      svc="true"
      str="FTL is not running"
      icon="${INFO}"
    else
      svc="kill -HUP ${pid}"
      str="Flushing DNS cache"
      icon="${TICK}"
    fi
  fi

  # Print output to Terminal, but not to Web Admin
  [[ -t 1 ]] && echo -ne "  ${INFO} ${str}..."

  output=$( { ${svc}; } 2>&1 )
  status="$?"

  if [[ "${status}" -eq 0 ]]; then
    [[ -t 1 ]] && echo -e "${OVER}  ${icon} ${str}"
    return 0
  else
    [[ ! -t 1 ]] && local OVER=""
    echo -e "${OVER}  ${CROSS} ${output}"
    return 1
  fi
}

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

Time:
  #s               En-/disable Pi-hole functionality for # second(s)
  #m               En-/disable Pi-hole functionality for # minute(s)"
    exit 0

  fi

  # Get timer
  local tt="null"
  if [[ $# -gt 1 ]]; then
    local error=false
    if [[ "${2}" == *"s" ]]; then
      tt=${2%"s"}
      if [[ ! "${tt}" =~ ^-?[0-9]+$ ]];then
        local error=true
      fi
    elif [[ "${2}" == *"m" ]]; then
      tt=${2%"m"}
      if [[ "${tt}" =~ ^-?[0-9]+$ ]];then
        tt=$((${tt}*60))
      else
        local error=true
      fi
    elif [[ -n "${2}" ]]; then
      local error=true
    fi

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

  # Authenticate with the API
  LoginAPI

  # Send the request
  data=$(PostFTLData "dns/blocking" "{ \"blocking\": ${1}, \"timer\": ${tt} }")

  # Check the response
  local extra=" forever"
  local timer="$(echo "${data}"| jq --raw-output '.timer' )"
  if [[ "${timer}" != "null" ]]; then
    extra=" for ${timer}s"
  fi
  local str="Pi-hole $(echo "${data}" | jq --raw-output '.blocking')${extra}"

  # Logout from the API
  LogoutAPI

  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/pihole.log
  off                 Disable and flush the Pi-hole log at /var/log/pihole/pihole.log
  off noflush         Disable the Pi-hole log at /var/log/pihole/pihole.log"
    exit 0
  elif [[ "${1}" == "off" ]]; then
    # Disable logging
    setFTLConfigValue dns.queryLogging false
    if [[ "${2}" != "noflush" ]]; then
      # Flush logs
      "${PI_HOLE_BIN_DIR}"/pihole -f
    fi
    echo -e "  ${INFO} Disabling logging..."
    local str="Logging has been disabled!"
  elif [[ "${1}" == "on" ]]; then
    # Enable logging
    setFTLConfigValue dns.queryLogging true
    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
  echo -e "${OVER}  ${TICK} ${str}"
}

analyze_ports() {
  local lv4 lv6 port=${1}
  # FTL is listening at least on at least one port when this
  # function is getting called
  # Check individual address family/protocol combinations
  # For a healthy Pi-hole, they should all be up (nothing printed)
  lv4="$(ss --ipv4 --listening --numeric --tcp --udp src :${port})"
  if grep -q "udp " <<< "${lv4}"; then
      echo -e "     ${TICK} UDP (IPv4)"
  else
      echo -e "     ${CROSS} UDP (IPv4)"
  fi
  if grep -q "tcp " <<< "${lv4}"; then
      echo -e "     ${TICK} TCP (IPv4)"
  else
      echo -e "     ${CROSS} TCP (IPv4)"
  fi
  lv6="$(ss --ipv6 --listening --numeric --tcp --udp src :${port})"
  if grep -q "udp " <<< "${lv6}"; then
      echo -e "     ${TICK} UDP (IPv6)"
  else
      echo -e "     ${CROSS} UDP (IPv6)"
  fi
  if grep -q "tcp " <<< "${lv6}"; then
      echo -e "     ${TICK} TCP (IPv6)"
  else
      echo -e "     ${CROSS} TCP (IPv6)"
  fi
  echo ""
}

statusFunc() {
    # Determine if there is pihole-FTL service is listening
    local pid port ftl_pid_file block_status

    ftl_pid_file="$(getFTLConfigValue files.pid)"

    pid="$(getFTLPID ${ftl_pid_file})"

    if [[ "$pid" -eq "-1" ]]; then
        case "${1}" in
            "web") echo "-1";;
            *) echo -e "  ${CROSS} DNS service is NOT running";;
        esac
        exit 0
    else
        # get the DNS port pihole-FTL is listening on
        port="$(getFTLConfigValue dns.port)"
        if [[ "${port}" == "0" ]]; then
            case "${1}" in
                "web") echo "-1";;
                *) echo -e "  ${CROSS} DNS service is NOT listening";;
            esac
            exit 0
        else
            if [[ "${1}" != "web" ]]; then
                echo -e "  ${TICK} FTL is listening on port ${port}"
                analyze_ports "${port}"
            fi
        fi
    fi

  # Determine if Pi-hole's blocking is enabled
  block_status=$(getFTLConfigValue dns.blocking.active)
  if [ ${block_status} == "true" ]; then
    case "${1}" in
      "web") echo "$port";;
      *) echo -e "  ${TICK} Pi-hole blocking is enabled";;
    esac
  else
    case "${1}" in
      "web") echo 0;;
      *) echo -e "  ${CROSS} Pi-hole blocking is disabled";;
    esac
  fi

  exit 0
}

tailFunc() {
  # Warn user if Pi-hole's logging is disabled
  local logging_enabled=$(getFTLConfigValue dns.queryLogging)
  if [[ "${logging_enabled}" != "true" ]]; then
    echo "  ${CROSS} Warning: Query logging is disabled"
  fi
  echo -e "  ${INFO} Press Ctrl-C to exit"

  # Get logfile path
  readonly LOGFILE=$(getFTLConfigValue files.log.dnsmasq)

  # Strip date from each line
  # Color blocklist/denylist/wildcard entries as red
  # Color A/AAAA/DHCP strings as white
  # Color everything else as gray
  tail -f $LOGFILE | grep --line-buffered "${1}" | sed -E \
    -e "s,($(date +'%b %d ')| dnsmasq\[[0-9]*\]),,g" \
    -e "s,(.*(denied |gravity blocked ).*),${COL_RED}&${COL_NC}," \
    -e "s,.*(query\\[A|DHCP).*,${COL_NC}&${COL_NC}," \
    -e "s,.*,${COL_GRAY}&${COL_NC},"
  exit 0
}

piholeCheckoutFunc() {
  if [ -n "${DOCKER_VERSION}" ]; then
    unsupportedFunc
  else
    if [[ "$2" == "-h" ]] || [[ "$2" == "--help" ]]; then
      echo "Switch Pi-hole subsystems to a different GitHub branch
    Usage: ${COL_GREEN}pihole checkout${COL_NC} ${COL_YELLOW}shortcut${COL_NC}
        or ${COL_GREEN}pihole checkout${COL_NC} ${COL_PURPLE}repo${COL_NC} ${COL_CYAN}branch${COL_NC}

  Example: ${COL_GREEN}pihole checkout${COL_NC} ${COL_YELLOW}master${COL_NC}
       or  ${COL_GREEN}pihole checkout${COL_NC} ${COL_PURPLE}ftl ${COL_CYAN}development${COL_NC}

  Shortcuts:
    ${COL_YELLOW}master${COL_NC}            Update all subsystems to the latest stable release
    ${COL_YELLOW}dev${COL_NC}               Update all subsystems to the latest development release

  Individual components:
    ${COL_PURPLE}core${COL_NC} ${COL_CYAN}branch${COL_NC}       Change the branch of Pi-hole's core subsystem
    ${COL_PURPLE}web${COL_NC} ${COL_CYAN}branch${COL_NC}        Change the branch of the web interface subsystem
    ${COL_PURPLE}ftl${COL_NC} ${COL_CYAN}branch${COL_NC}        Change the branch of Pi-hole's FTL subsystem"

      exit 0
    fi

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

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

  tricorder_token=$(curl --silent --fail --show-error --upload-file "-" https://tricorder.pi-hole.net/upload < /dev/stdin 2>&1)
  if [[ "${tricorder_token}" != "https://tricorder.pi-hole.net/"* ]]; then
      echo -e "${CROSS} uploading failed, contact Pi-hole support for assistance."
      # Log curl error (if available)
      if [ -n "${tricorder_token}" ]; then
          echo -e "${INFO} Error message: ${COL_RED}${tricorder_token}${COL_NC}\\n"
          tricorder_token=""
      fi
      exit 1
  fi
  echo "Upload successful, your token is: ${COL_GREEN}${tricorder_token}${COL_NC}"
  exit 0
}

updateCheckFunc() {
  "${PI_HOLE_SCRIPT_DIR}"/updatecheck.sh "$@"
  exit 0
}

unsupportedFunc(){
  echo "Function not supported in Docker images"
  exit 0
}

helpFunc() {
  echo "Usage: pihole [options]
Example: 'pihole allow -h'
Add '-h' after specific commands for more information on usage

Domain Options:
  allow, allowlist    Allow domain(s)
  deny, denylist      Deny domain(s)
  --regex, regex      Regex deny domains(s)
  --allow-regex       Regex allow domains(s)
  --wild, wildcard    Wildcard deny domain(s)
  --allow-wild        Wildcard allow domain(s)
                        Add '-h' for more info on allow/deny usage

Debugging Options:
  -d, debug           Start a debugging session
                        Add '-c' or '--check-database' to include a Pi-hole database integrity check
                        Add '-a' to automatically upload the log to tricorder.pi-hole.net
  -f, flush           Flush the Pi-hole log
  -r, reconfigure     Reconfigure or Repair Pi-hole subsystems
  -t, tail [arg]      View the live output of the Pi-hole log.
                      Add an optional argument to filter the log
                      (regular expressions are supported)
  api <endpoint>      Query the Pi-hole API at <endpoint>


Options:
  setpassword [pwd]   Set the password for the web interface
                        Without optional argument, password is read interactively.
                        When specifying a password directly, enclose it in single quotes.
  -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
                        Add '--check-only' to exit script before update is performed.
  -v, version         Show installed versions of Pi-hole, Web Interface & FTL
  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
  reloaddns           Update the lists and flush the cache without restarting the DNS server
  reloadlists         Update the lists WITHOUT flushing the cache or restarting the DNS server
  checkout            Switch Pi-hole subsystems to a different GitHub branch
                        Add '-h' for more info on checkout usage
  arpflush            Flush information stored in Pi-hole's network tables";
  exit 0
}

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

# functions that do not require sudo power
need_root=1
case "${1}" in
  "-h" | "help" | "--help"        ) helpFunc;;
  "-v" | "version"                ) versionFunc;;
  "-c" | "chronometer"            ) chronometerFunc "$@";;
  "-q" | "query"                  ) queryFunc "$@";;
  "status"                        ) statusFunc "$2";;
  "tricorder"                     ) tricorderFunc;;

  # we need to add all arguments that require sudo power to not trigger the * argument
  "allow" | "allowlist"           ) need_root=0;;
  "deny" | "denylist"             ) need_root=0;;
  "--wild" | "wildcard"           ) need_root=0;;
  "--regex" | "regex"             ) need_root=0;;
  "--allow-regex" | "allow-regex" ) need_root=0;;
  "--allow-wild" | "allow-wild"   ) need_root=0;;
  "-f" | "flush"                  ) ;;
  "-up" | "updatePihole"          ) ;;
  "-r"  | "reconfigure"           ) ;;
  "-l" | "logging"                ) ;;
  "uninstall"                     ) ;;
  "enable"                        ) need_root=0;;
  "disable"                       ) need_root=0;;
  "-d" | "debug"                  ) ;;
  "-g" | "updateGravity"          ) ;;
  "reloaddns"                     ) ;;
  "reloadlists"                   ) ;;
  "setpassword"                   ) ;;
  "checkout"                      ) ;;
  "updatechecker"                 ) ;;
  "arpflush"                      ) ;;
  "-t" | "tail"                   ) ;;
  "api"                           ) need_root=0;;
  *                               ) helpFunc;;
esac

# In the case of alpine running in a container, the USER variable appears to be blank
# which prevents the next trap from working correctly. Set it by running whoami
if [[ -z ${USER} ]]; then
  USER=$(whoami)
fi

# Check if the current user is neither root nor pihole and if the command
# requires root. If so, exit with an error message.
if [[ $EUID -ne 0 && ${USER} != "pihole" && need_root -eq 1 ]];then
  echo -e "  ${CROSS} The Pi-hole command requires root privileges, try:"
  echo -e "      ${COL_GREEN}sudo pihole $*${COL_NC}"
  exit 1
fi

# Handle redirecting to specific functions based on arguments
case "${1}" in
  "allow" | "allowlist"           ) listFunc "$@";;
  "deny" | "denylist"             ) listFunc "$@";;
  "--wild" | "wildcard"           ) listFunc "$@";;
  "--regex" | "regex"             ) listFunc "$@";;
  "--allow-regex" | "allow-regex" ) listFunc "$@";;
  "--allow-wild" | "allow-wild"   ) listFunc "$@";;
  "-d" | "debug"                  ) debugFunc "$@";;
  "-f" | "flush"                  ) flushFunc "$@";;
  "-up" | "updatePihole"          ) updatePiholeFunc "$@";;
  "-r"  | "reconfigure"           ) reconfigurePiholeFunc;;
  "-g" | "updateGravity"          ) updateGravityFunc "$@";;
  "-l" | "logging"                ) piholeLogging "$@";;
  "uninstall"                     ) uninstallFunc;;
  "enable"                        ) piholeEnable true "$2";;
  "disable"                       ) piholeEnable false "$2";;
  "reloaddns"                     ) reloadDNS "reload";;
  "reloadlists"                   ) reloadDNS "reload-lists";;
  "setpassword"                   ) SetWebPassword "$@";;
  "checkout"                      ) piholeCheckoutFunc "$@";;
  "updatechecker"                 ) shift; updateCheckFunc "$@";;
  "arpflush"                      ) arpFunc "$@";;
  "-t" | "tail"                   ) tailFunc "$2";;
  "api"                           ) apiFunc "$2";;
  *                               ) helpFunc;;
esac