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#!/usr/bin/env bash
#
# nagios-downstream-list(1) -- List all the descendents of at least one given
# host, unique and sorted.
#
# $ ndl abc-example-mc-1
#
# Author: Tom Ryder <tom@sanctum.geek.nz>
# Copyright: 2016
#
# Name self
self=nagios-downstream-list
# Usage printing function
usage() {
printf 'USAGE: %s HOST1 [HOST2 ... ]\n' "$self"
}
# Handle options, just -h help at the moment
OPTIND=1
while getopts 'h' opt ; do
case "$opt" in
h)
usage
exit 0
;;
'?')
usage >&2
exit 1
;;
esac
done
shift "$((OPTIND-1))"
# We need at least one argument remaining
if ! (($#)) ; then
usage >&2
exit 1
fi
# Define the path to the Livestatus socket
socket=${MK_LIVESTATUS_SOCKET:-/usr/local/nagios/var/rw/live}
# Recursive function to print all the descendents of the arguments
descendents() {
for ancestor ; do
while read -r child ; do
printf '%s\n' "$child"
descendents "$child"
done < <(unixcat "$socket" <<EOF
GET hosts
Columns: host_name
Filter: parents >= $ancestor
EOF
)
done | sort -uV
}
# Run the recursive function on all the arguments given to this script
descendents "$@"
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