arin-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}") [-f] [-4|-6] <organization handle>"; }

declare mode=""
declare -i force=0
while getopts ":f46" opts; do
  case "${opts}" in
    f) force=1 ;;
    4) # shellcheck disable=SC2015
       [[ -z "${mode}" ]] && mode="NET" || err "Can not combine -4 with -6" ;;
    6) # shellcheck disable=SC2015
       [[ -z "${mode}" ]] && mode="NET6" || err "Can not combine -6 with -4" ;;
    *) usage ;;
  esac
done
shift $((OPTIND-1))

[[ ${#} != 1 ]] && usage

# (Subset of) Searching Whois Using a CLI
#
# Query-by-record-type:
# To limit your query to a specific record type, include one of the following
# flags:
#       n       Network address space
#       r       CIDRized network space
#       d       Delegations
#       a       Autonomous systems
#       p       Points-of-contact
#       o       Organizations
#       c       End-user customers
#       e       Points-of-contact, Organizations, End-user customers
#       z       All of the above
#
# Query-by-attribute:
# To limit your query to a specific record attribute, include one of the
# following flags:
#       @<domain name>     Searches for matches by domain-portion of an
#                          email address
#       ! <handle>         Searches for matches by handle or id
#       / <name>           Searches for matches by name
#       . <name>           Searches for matches by name
#                          (same as above, but some WHOIS clients have
#                          problems with)
#
# Searches that retrieve a single record will display the full record.
# Searches that retrieve more than one record will be displayed in list
# output.
#
# Record hierarchy:
# Records in the ARIN WHOIS database have hierarchical relationships with
# other records. To display those related records, use the following flags:
#
#       <       Displays the record related up the hierarchy. For a network,
#               display the supernet, or parent network in detailed format.
#       >       Displays the record related down the hierarchy. For a network,
#               display the subdelegations, or subnets, below the network, in
#               list format. For an organization or customer, display the
#               resources registered to that organization or customer, in
#               list format.
#       =       Display only an exact match in the hierarchy.
#
# Reference: https://www.arin.net/resources/registry/whois/rws/cli/

declare -i lines=0
whois -h whois.arin.net -- "o \! > ${1}" | \
  # Handle ARIN WHOIS result limit somehow, see: "ACSP Suggestion 2012.20:
  # Remove result limit for Whois-RWS child network queries", reference:
  # https://www.arin.net/participate/community/acsp/suggestions/2012/2012-20/
  { result="$(tee)";  # Use tee(1), because /dev/stdin hangs on empty pipe
    [[ "${result}" == *"query resulted in more than 256 records"* ]] && \
    [[ ${force} == 0 ]] && err "Query resulted in more than 256 records" || \
    echo "${result}"; } | \
  gawk -F ') ' '/ \('"${mode:-NET6?}"'-/ { print $2 }' | \
  while IFS=$'\n' read -r line; do
    lines=$((++lines))
    ipcalc --no-decorate --deaggregate="${line}"
  done

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