hosts-yaml-to-aaaa

#!/bin/bash -e

default_path="pillar/domain/qe_nue2_suse_org/hosts.yaml"
default_prefix="2a07:de40:a102:5:"
default_dns_base=salt/profile/dns/files/

usage() {
    cat << EOF
Usage: hosts-yaml-to-aaaa [path]

Parse a hosts.yaml file with a format as used within the SUSE infrastructure
recording the hostname and mac address of hosts and outputs SLAAC-compliant
AAAA records that point to IPv6 address that the hosts possibly use.

Options:
 -v, --verbose               execute with verbose output
 -h, -?, --help              display this help
 -o, --offline               Output also host entries for hosts that are
                             offline or do not respond to a ping request.
 -p <path>, --path <path>    set different <path> to a hosts.yaml file,
                             by default '$default_path'
 -P <P>, --prefix <P>        IPv6 address prefix, default '$default_prefix'
 -u, --unique                Output no already existing AAAA records if found
                             in <dns_path>.
 -d <dns_path>,
    --dns-path <dns_path>    set different path <dns_path> to DNS zone file,
                             by default
                             '$default_dns_base<top_domain>/dns-<domain>'
                             with '<top_domain>'+'<domain>' derived from <path>.
 -r, --reverse               Instead of AAAA output reverse PTR records

Examples:
 hosts-yaml-to-aaaa pillar/domain/my_org/hosts.yaml
 hosts-yaml-to-aaaa -unique --offline --path hosts.yaml
EOF
    exit
}

set -o pipefail

prefix="${prefix:-"$default_prefix"}"
unique="${unique:-false}"
offline="${offline:-false}"

opts=$(getopt -o vhuop:P:d:r --long verbose,help,unique,offline,path:,prefix:,dns_path:,reverse -n 'parse-options' -- "$@") || usage
eval set -- "$opts"
while true; do
  case "$1" in
    -v | --verbose ) set -x; shift ;;
    -h | --help ) usage; shift ;;
    -u | --unique ) unique=true; shift ;;
    -o | --offline ) offline=true; shift ;;
    -p | --path ) path="$2"; shift 2 ;;
    -P | --prefix ) prefix="$2"; shift 2 ;;
    -d | --dns-path ) dns_path="$2"; shift 2 ;;
    -r | --reverse ) reverse=true; shift ;;
    -- ) shift; break ;;
    * ) break ;;
  esac
done

path="${path:-${1:-$default_path}}"
base="$(basename "$(dirname "$path")")"
domain="${base//_/.}"
default_dns_path="salt/profile/dns/files/${base#*_}/dns-$domain"
dns_path="${dns_path:-$default_dns_path}"

export prefix

yq -r 'to_entries[] | [.key, .value.mac] | @tsv' "$path" | while read -r host mac; do
    ip=$(mac-to-ipv6 "$mac")
    ip=${ip,,}
    if [ "$unique" = "true" ]; then
        grep -q "$ip" "$dns_path" && continue
    fi
    if [ "$offline" != "true" ]; then
        ping -q -c1 "$ip" >/dev/null || continue
    fi
    if [ "$reverse" = "true" ]; then
        sipcalc -r "$ip" | sed -n "s/ip6\.arpa\./&     14400 PTR $host.$domain./p"
        continue
    else
        echo "$host       AAAA  $ip"
    fi
done