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144 lines
3.1 KiB
Bash
Executable file
144 lines
3.1 KiB
Bash
Executable file
#!/bin/sh
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# shellcheck shell=dash
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# -*- sh -*-
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: << =cut
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=head1 NAME
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whois - Plugin to monitor expiry dates of domains in the WHOIS database
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Though the plugin will be called every 5 minutes, it will keep a cache, and
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only query the WHOIS database C<cache_expiry_mins> minutes.
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=head1 CONFIGURATION
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First, create a section in your munin-node configuration files. The domain envvar
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is mandatory, others are optional.
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[whois]
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env.domains example.com example.org
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env.extract_re s/PATTERN/REPL/
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env.warning_days <default: 7 days>
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env.critical_days <default: 3 days>
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env.cache_expiry_mins <default: 60 minutes>
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C<domains> is a space-separated list of domains to be checked.
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The C<extract_re> will be used in C<sed> to extract the relevant expiry date. It
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default to C<s/^.*[Ee]xpir.*: //>. Only lines for which a replacement has
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happened will be considered, and the pattern should take care to only output
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one line. While the default RegExp just finds a leader pattern and removes it,
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it is possible to write more complex logic to format the date. The extracted
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date needs to be in a format supported by C<date(1)>'s C<--date> parameter.
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Then create a symlink to enable this plugin:
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ln -s /path/to/whois /etc/munin/plugins/
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=head1 AUTHOR
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Olivier Mehani
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Copyright (C) 2020 Olivier Mehani <shtrom+munin@ssji.net>
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=head1 LICENSE
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SPDX-License-Identifier: GPL-3.0-or-later
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=head1 MAGIC MARKERS
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#%# family=manual
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=cut
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set -eu
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# shellcheck disable=SC1091
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. "${MUNIN_LIBDIR}/plugins/plugin.sh"
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if [ "${MUNIN_DEBUG:-0}" = 1 ]; then
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set -x
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fi
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DOMAINS=${domains:-""}
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EXTRACT_RE=${extract_re:-'s/^.*[Ee]xpir.*: //'}
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WARNING=${warning_days:-7}
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CRITICAL=${critical_days:-3}
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CACHE_EXPIRY=${cache_expiry_mins:-60}
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# Args: domain name (optional, for title)
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graph_config() {
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cat << EOF
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graph_title Domain registration expiry
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graph_category network
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graph_vlabel days
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EOF
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}
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# Args: domain name
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# Separated from graph_config so we can easily extend the plugin to support multiple domains.
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config() {
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local NAME
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local FIELDNAME
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for NAME in $DOMAINS
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do
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FIELDNAME="$(clean_fieldname "${NAME}")"
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cat << EOF
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${FIELDNAME}.label ${NAME}
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${FIELDNAME}.cdef ${FIELDNAME},86400,/
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${FIELDNAME}.warning ${WARNING}:
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${FIELDNAME}.critical ${CRITICAL}:
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EOF
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done
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}
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# Args: domain name
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fetch() {
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local NAME
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local FIELDNAME
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local CACHEFILE
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for NAME in $DOMAINS
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do
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FIELDNAME="$(clean_fieldname "${NAME}")"
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CACHEFILE="${MUNIN_PLUGSTATE}/$(basename "${0}").${FIELDNAME}.cache"
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if [ -z "$(find "${CACHEFILE}" -mmin -"${CACHE_EXPIRY}" 2>/dev/null)" ]; then
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EXPIRY="$(whois "${NAME}" 2>/dev/null | sed -n "${EXTRACT_RE}p;T;q")" # T;q exits after printing the first match
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DELTA_TS=U
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if [ -n "${EXPIRY}" ]; then
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EXPIRY_TS="$(date +%s -d "${EXPIRY}")"
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NOW_TS="$(date +%s)"
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DELTA_TS=$((EXPIRY_TS-NOW_TS))
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fi
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echo "${FIELDNAME}.value ${DELTA_TS}" > "${CACHEFILE}"
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fi
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cat "${CACHEFILE}"
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done
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}
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main() {
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local MODE="${1:-}"
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local NAME
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NAME="$(echo "${0}" | sed 's/.*_//')"
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case "${MODE}" in
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'config')
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graph_config "${NAME}"
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config "${NAME}"
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;;
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*)
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fetch "${NAME}"
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;;
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esac
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}
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main "$@"
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