#!/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
}

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

  # 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
  else
    # A full restart has been requested
    svc="service pihole-FTL restart"
    str="Restarting DNS server"
    icon="${TICK}"
  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
  restartDNS
  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 "  ${CROSS} DNS service is NOT running";;
        esac
        return 0
    else
        # get the DNS port pihole-FTL is listening on
        port="$(getFTLConfigValue dns.port)"
        if [[ "${port}" == "0" ]]; then
            case "${1}" in
                "web") echo "-1";;
                *) echo -e "  ${CROSS} DNS service is NOT listening";;
            esac
            return 0
        else
            if [[ "${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 "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 Web Interface 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
    branchname          Update subsystems to the specified branchname"
      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)


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
  restartdns          Full restart Pi-hole subsystems
                        Add 'reload' to update the lists and flush the cache without restarting the DNS server
                        Add 'reload-lists' to only 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"                ) ;;
  "restartdns"                  ) ;;
  "-g" | "updateGravity"        ) ;;
  "reloaddns"                   ) ;;
  "setpassword"                 ) ;;
  "checkout"                    ) ;;
  "updatechecker"               ) ;;
  "arpflush"                    ) ;;
  "-t" | "tail"                 ) ;;
  *                             ) 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";;
  "restartdns"                  ) restartDNS "$2";;
  "reloaddns"                   ) restartDNS "reload";;
  "setpassword"                 ) SetWebPassword "$@";;
  "checkout"                    ) piholeCheckoutFunc "$@";;
  "updatechecker"               ) shift; updateCheckFunc "$@";;
  "arpflush"                    ) arpFunc "$@";;
  "-t" | "tail"                 ) tailFunc "$2";;
  *                             ) helpFunc;;
esac