vyos-irr.sh

#!/usr/bin/env bash
set -euo pipefail

usage() {
  cat <<EOF
Usage:
  $0 ASN [options]

Arguments:
  ASN                     Target ASN (e.g. AS15169)

Options:
  --start-rule N          Starting rule number (default: 1)
  --name NAME             Prefix-list base name
  -h, --help              Show this help

Examples:
  $0 AS15169
  $0 AS15169 --start-rule 100
  $0 AS15169 --start-rule 100 --name google

Output examples:
  set policy prefix-list google-v4 rule 100 action permit
  set policy prefix-list google-v4 rule 100 prefix 8.8.8.0/24

  set policy prefix-list6 google-v6 rule 100 action permit
  set policy prefix-list6 google-v6 rule 100 prefix 2001:4860::/32

Requirements:
  - bgpq4
  - jq
EOF
}

if [[ $# -lt 1 ]]; then
  usage
  exit 1
fi

ASN=""
START_RULE=1
BASE_NAME=""

while [[ $# -gt 0 ]]; do
  case "$1" in
    --start-rule)
      START_RULE="${2:-}"
      shift 2
      ;;
    --name)
      BASE_NAME="${2:-}"
      shift 2
      ;;
    -h|--help)
      usage
      exit 0
      ;;
    --*)
      echo "Error: Unknown option: $1" >&2
      echo >&2
      usage
      exit 1
      ;;
    *)
      if [[ -z "$ASN" ]]; then
        ASN="$1"
      else
        echo "Error: Multiple ASN arguments specified" >&2
        exit 1
      fi
      shift
      ;;
  esac
done

if [[ -z "$ASN" ]]; then
  echo "Error: ASN is required" >&2
  echo >&2
  usage
  exit 1
fi

command -v bgpq4 >/dev/null 2>&1 || {
  echo "Error: bgpq4 not found" >&2
  exit 1
}

command -v jq >/dev/null 2>&1 || {
  echo "Error: jq not found" >&2
  exit 1
}

if [[ -z "$BASE_NAME" ]]; then
  BASE_NAME="$(echo "${ASN}" | tr '[:upper:]' '[:lower:]')"
fi

LIST_V4="${BASE_NAME}-v4"
LIST_V6="${BASE_NAME}-v6"

TMP_V4="$(mktemp)"
TMP_V6="$(mktemp)"

cleanup() {
  rm -f "$TMP_V4" "$TMP_V6"
}
trap cleanup EXIT

bgpq4 -4 -j "${ASN}" > "$TMP_V4"
bgpq4 -6 -j "${ASN}" > "$TMP_V6"

jq -r \
  --arg name "$LIST_V4" \
  --argjson start "$START_RULE" '
  .NN
  | to_entries[]
  | ($start + .key) as $rule
  | "set policy prefix-list \($name) rule \($rule) action permit\n" +
    "set policy prefix-list \($name) rule \($rule) prefix \(.value.prefix)"
' "$TMP_V4"

jq -r \
  --arg name "$LIST_V6" \
  --argjson start "$START_RULE" '
  .NN
  | to_entries[]
  | ($start + .key) as $rule
  | "set policy prefix-list6 \($name) rule \($rule) action permit\n" +
    "set policy prefix-list6 \($name) rule \($rule) prefix \(.value.prefix)"
' "$TMP_V6"