afrinic-inverse2prefix

#!/bin/bash
#
# Copyright (c) 2022 Nagrind <https://github.com/nagrind>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#

set -euo pipefail
shopt -s lastpipe

err() { echo "${@}" 1>&2; exit 1; }
usage() { err "Usage: $(basename "${0}") [-4|-6] <attribute-name>" \
              "<inverse-key>"; }

declare mode=""
while getopts ":46" opts; do
  case "${opts}" in
    4) mode+="inetnum," ;;
    6) mode+="inet6num," ;;
    *) usage ;;
  esac
done
shift $((OPTIND-1))

[[ ${#} != 2 ]] && usage

# (Subset of) Query Types supported by the AFRINIC Database
#
# -i, --inverse <attribute-name> <inverse-key>
#       Perform an inverse query.
#
# -K, --primary-keys
#       Requests that only the primary keys of an object to be returned. The
#       exceptions are set objects, where the (mp-)members attributes will
#       also be returned. This flag does not apply to person and role
#       objects.
#
# -T, --select-types (comma separated list of object types with no white space)
#       Select the types of objects to lookup in the query.
#
# Reference: https://afrinic.net/support/whois/manual

declare -i lines=0
whois -h whois.afrinic.net -- \
  -T "${mode:-inetnum,inet6num}" -K -i "${1,,}" "${2}" | \
  gawk -F ': ' '/^inet6?num:/ { print $2 }' | \
  while IFS=$'\n' read -r line; do
    lines=$((++lines))
    # shellcheck disable=SC2015
    [[ "${line}" == *":"* ]] && echo "${line// /}" || \
      ipcalc --no-decorate --deaggregate="${line// /}"
  done

# shellcheck disable=SC2015
[[ ${lines} == 0 ]] && err "No entries found" || :