dns-manager/dns-record-delete

#!/usr/bin/env bash

SCRIPT_PATH=$(realpath -s "$0")
SCRIPT_DIR=$(dirname "$SCRIPT_PATH")
SCRIPT=$(basename "$SCRIPT_PATH")

usage() {
  cat <<EOF
Usage: $SCRIPT [OPTIONS]... ZONE[@VIEW] NAME TYPE [VALUE]

Delete DNS records.

Options:
  -c, --config       path to config file
  -h, --help         print this help message
  -f, --force        delete records without confirmation prompt
  -i, --interactive  interactively ask for missing arguments

EOF
  exit
}

config_file="/etc/dns-manager/config.sh"
force=false
interactive=false

declare -a args=()
while [ -n "$1" ]; do
  opt=$1
  shift
  case "$opt" in
    -c|--config)
      if [ -z "$1" ]; then
        echo "$SCRIPT: missing argument to option -- '$opt'" >&2
	exit 1
      fi
      config_file=$1
      shift
    ;;
    -h|--help)
      usage
    ;;
    -i|--interactive)
      interactive=true
    ;;
    -f|--force)
      force=true
    ;;
    -*)
      echo "$SCRIPT: invalid option -- '$opt'" >&2
      exit 1
    ;;
    *)
      args+=("$opt")
      if (( ${#args[@]} > 5 )); then
        echo "$SCRIPT: invalid argument -- '$opt'" >&2
        exit 1
      fi
    ;;
  esac
done

source "$config_file" || exit 2

LIB_DIR=${LIB_DIR:-$SCRIPT_DIR/lib}
source "$LIB_DIR"/dns.sh || exit 3

set -- "${args[@]}"

zone=$1
if shift; then
  dns_check_zone_view "$zone" zone view || exit 10
elif $interactive; then
  dns_select_zone zone view || exit 11
else
  echo "$SCRIPT: missing argument -- ZONE[@VIEW]" >&2
  exit 1
fi

declare -A zone_data

if [ "${view}" == "*" ]; then
  json_array_to_bash views < <(dns_zone_views "$zone")
else
  views=("$view")
fi

records=$(
  for view in "${views[@]}"; do
    dns_zone "$zone" "$view" || exit 22
  done | "$JQ" --compact-output --slurp 'add'
)

name=$1
if shift; then
  dns_check_record_name "$name" name || exit 21
elif $interactive; then
  if (( ${#zone_data[@]} > 1 )); then
    dns_read_record_name name || exit 10
  else
    json_array_to_bash names < <("$JQ" --compact-output '[ .[] | .name ] | sort | unique' <<<"$records")
    COLUMNS=30
    echo -e "Select record name:\n"
    select name in "${names[@]}"; do
      [ -n "$name" ] && break
    done
    [ -z "$name" ] && echo "ERROR: record name selection failed" >&2 && exit 11
    echo
  fi
else
  echo "$SCRIPT: missing argument -- NAME" >&2
  exit 1
fi

records=$("$JQ" --compact-output --arg name "$name" '[ .[] | select(.name == $name) ]' <<<"$records")
[ "$records" == "[]" ] && echo "ERROR: no such record -- '$name'" >&2 && exit 5

json_array_to_bash rtypes < <("$JQ" --compact-output '[ .[] | .type ] | sort | unique' <<<"$records")

rtype=${1^^}
if shift; then
  dns_check_record_type "$rtype" || exit 23
elif $interactive; then
  if [ "$view" == "*" ]; then
    dns_select_record_type rtype || exit 10
  else
    echo -e "Select record type:\n"
    select rtype in "${rtypes[@]}"; do
      [ -n "$rtype" ] && break
    done
    [ -z "$name" ] && echo "ERROR: record type selection failed" >&2 && exit 11
    echo
  fi
else
  echo "$SCRIPT: missing argument -- TYPE" >&2
  exit 1
fi

records=$("$JQ" --compact-output --arg rtype "$rtype" '[ .[] | select(.type == $rtype) ]' <<<"$records")
[ "$records" == "[]" ] && echo "ERROR: no ${rtype} record found" >&2 && exit 5

json_array_to_bash values < <("$JQ" --compact-output '[ .[] | .value ] | sort | unique' <<<"$records")

value=$1
if shift; then
  dns_check_record_value "$rtype" "$value" value || exit 24
elif $interactive; then
  if [ "$view" == "*" ]; then
    dns_read_record_value "$rtype" value || exit 10
  else
    if ! yes_no "Delete all ${rtype} records?"; then
      echo -e "\nSelect value:\n"
      select value in "${values[@]}"; do
        [ -n "$value" ] && break
      done
    fi
    [ -z "$name" ] && echo "ERROR: invalid answer" >&2 && exit 11
    echo
  fi
fi

if [ -n "$value" ]; then
  decoded_value=$(dns_decode_txt_value "$value")
  records=$("$JQ" --compact-output --arg value "$decoded_value" '[ .[] | select(.decoded_value == $value) ]' <<<"$records")
  [ "$records" == "[]" ] && echo "ERROR: no $rtype record matches value" >&2 && exit 6
fi

json_array_to_bash views < <("$JQ" --compact-output '[ .[] | .view ] | sort | unique' <<<"$records")

if ! $force; then
  for view in "${views[@]}"; do
    echo "View: $view"
    json_array_to_bash values < <("$JQ" --compact-output '[ .[] | .value ] | sort | unique' <<<"$records")
    for value in "${values[@]}"; do
      output=$(dns_record_delete "true" "$zone" "$view" "$name" "$rtype" "$value" 2>&1)
      if (( $? == 0 )); then
        echo -n -e "\e[31m- $TAB"
        echo -n -e "$output\e[0m" | grep --color=never -v -E '^(Outgoing update query:|;.*)?$'
      else
        echo -e "\e[31mERROR:\n" >&2
        echo -e "$output\e[0m" >&2
        exit 30
      fi
    done
  done
  echo
  ! yes_no "Proceed?" && echo -e "Aborted" && exit
  echo
fi

echo -n "Sending DDNS update(s)... "
for view in "${views[@]}"; do
  json_array_to_bash values < <("$JQ" --compact-output '[ .[] | .value ] | sort | unique' <<<"$records")
  for value in "${values[@]}"; do
    output=$(dns_record_delete "false" "$zone" "$view" "$name" "$rtype" "$value" 2>&1)
    if (( $? != 0 )); then
      echo -e "ERROR updating view -- '$view'\n" >&2
      echo "$output" >&2
      exit 31
    fi
  done
done
echo "OK"