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#!/bin/sh
# Munin plugin for monitoring Postfix SASL logins. Symlink/rename to
# 'postfix_sasl_$SYSLOGNAME'.
# Copyright © 2015 Guilhem Moulin <guilhem@fripost.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
PATH=/usr/bin:/bin:/usr/sbin:/sbin
set -u
LOGFILE="/var/log/${logfile:-mail.log}"
STATEFILE="$MUNIN_PLUGSTATE/${0##*/}.offset"
name="${0##*/}"
[ "${name#postfix_sasl_}" != "$name" ] && postfix="${name#postfix_sasl_}" || postfix=
case "${1:-}" in
config) cat <<- EOF
graph_title Postfix SASL ($([ -n "$postfix" -a "$postfix" != postfix ] && echo "'${postfix#postfix-}'" || echo default) instance)
graph_vlabel logins per \${graph_period}
graph_args --base 1000 -l 0
graph_scale no
graph_period minute
graph_category postfix
successful.label successful
successful.type DERIVE
successful.draw AREA
successful.min 0
failed.label failed
failed.type DERIVE
failed.draw STACK
failed.min 0
EOF
exit 0
;;
esac
if [ ! -f "$LOGFILE" ]; then
for postfix in ${postmulti:-postfix}; do
echo "${postfix}_volume.value U"
done
exit 0;
fi
tmpfile="$(mktemp --tmpdir)"
trap 'rm -f "$tmpfile"' EXIT
logtail -f"$LOGFILE" -o"$STATEFILE" | sed -nr "s#^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ $postfix/smtpd\[[[:digit:]]+\]: ##p" >"$tmpfile"
echo successful.value $(grep -Ec "^warning: [-._[:alnum:]]+\[[.[:digit:]]+\]: SASL \S+ authentication failed(:.*)?$" "$tmpfile")
echo failed.value $(grep -Ec "^[[:xdigit:]]{10}: client=\S+, sasl_method=\S+, sasl_username=" "$tmpfile")
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