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#!/bin/sh
# Munin plugin for monitoring Dovecot logins and IMAP throughput.
# 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
LOGFILE="/var/log/${logfile:-mail.log}"
STATEFILE="$MUNIN_PLUGSTATE/${0##*/}.offset"
. $MUNIN_LIBDIR/plugins/plugin.sh
is_multigraph
case "${1:-}" in
config) cat <<- EOF
multigraph dovecot_login_status
graph_title Dovecot login status
graph_vlabel logins per \${graph_period}
graph_args --base 1000 -l 0
graph_scale no
graph_period minute
graph_category dovecot
successful.label auth successful
successful.type DERIVE
successful.draw AREA
successful.min 0
failed.label auth failed
failed.type DERIVE
failed.draw STACK
failed.min 0
noauth.label no auth attempt
noauth.type DERIVE
noauth.draw STACK
noauth.min 0
multigraph dovecot_login_types
graph_title Dovecot login types
graph_vlabel logins per \${graph_period}
graph_args --base 1000 -l 0
graph_scale no
graph_period minute
graph_category dovecot
imap.label IMAP
imap.type DERIVE
imap.draw AREA
imap.min 0
pop3.label POP3
pop3.type DERIVE
pop3.draw STACK
pop3.min 0
managesieve.label managesieve
managesieve.type DERIVE
managesieve.draw STACK
managesieve.min 0
multigraph dovecot_imap_throughput
graph_title Dovecot IMAP throughput
graph_vlabel bytes per \${graph_period}
graph_args --base 1024 -l 0
graph_scale yes
graph_period minute
graph_category dovecot
read.label read
read.type DERIVE
read.min 0
written.label written
written.type DERIVE
written.min 0
EOF
exit 0
;;
esac
if [ ! -f "$LOGFILE" ]; then
for field in successful failed noauth imap pop3 managesieve read written; do
echo $field.value U
done
exit 0;
fi
tmpfile="$(mktemp --tmpdir)"
trap 'rm -f "$tmpfile"' EXIT
logtail -f"$LOGFILE" -o"$STATEFILE" | sed -nr "s#^\w{3} [ :[:digit:]]{11} [._[:alnum:]-]+ dovecot: ##p" >"$tmpfile"
sum() {
awk 'BEGIN{x=0} {x+=$0} END{print x}'
}
prefix="^(pop3|imap|managesieve)-login"
echo multigraph dovecot_login_status
echo successful.value $(grep -Ec "$prefix: Login: user=<[^>]+>,\s" "$tmpfile")
echo failed.value $(sed -nr "s#$prefix: Aborted login \(auth failed, ([[:digit:]]+) attempts in [[:digit:]]+ secs\): user=<[^>]*>, .*#\2#p" "$tmpfile" | sum)
echo noauth.value $(grep -Ec "$prefix: Aborted login \(no auth attempts in [[:digit:]]+ secs\): user=<>,\s" "$tmpfile")
echo multigraph dovecot_login_types
for type in imap pop3 managesieve; do
echo $type.value $(grep -Ec "^$type-login:\s" "$tmpfile")
done
regexp="^imap\([-_.@[:alnum:]]+\): .* in=([[:digit:]]+) out=([[:digit:]]+)$"
echo multigraph dovecot_imap_throughput
echo read.value $(sed -nr "s#$regexp#\1#p" "$tmpfile" | sum)
echo written.value $(sed -nr "s#$regexp#\2#p" "$tmpfile" | sum)
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