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#!/bin/bash
#
# Plugin to monitor incoming DKIM mail.
#
# Florian Sager, sager@agitos.de, 2008-02-06
#
# Parameters understood:
#
# config (required)
# autoconf (optional)
#
# Gives the result of the verification. The following values are possible:
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#
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# pass
# Returned if a valid DKIM-Signature header was found, and the signature contains a correct value for the message.
#
# fail
# Returned if a valid DKIM-Signature header was found, but the signature does not contain a correct value for the message.
#
# invalid
# Returned if no valid DKIM-Signature headers were found, but there is at least one invalid DKIM-Signature header. For a reason why a DKIM-Signature header found in the message was invalid, see $dkim->{signature_reject_reason}.
#
# none
# Returned if no DKIM-Signature headers (valid or invalid) were found.
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#
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# In case of multiple signatures, the "best" result will be returned. Best is defined as "pass", followed by "fail", "invalid", and "none".
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#
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mktempfile () {
mktemp -t
}
MAIL_LOG=${logfile:-/var/log/mail.log}
LOGTAIL=${logtail:-`which logtail`}
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STATEFILE=$MUNIN_PLUGSTATE/dkimproxy_mails.offset
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if [ "$1" = "autoconf" ]; then
if [ -f "${MAIL_LOG}" -a -n "${LOGTAIL}" -a -x "${LOGTAIL}" ] ; then
echo yes
exit 0
else
echo no
exit 1
fi
fi
if [ "$1" = "config" ]; then
echo 'graph_title DKIM Proxy mails'
echo 'graph_order dkimnone dkimpass dkiminvalid dkimfail'
echo 'graph_category mail'
echo 'graph_vlabel Count'
echo 'graph_args --base 1000 -l 0'
# echo 'graph_total total'
echo 'dkimnone.label No DKIM-Sigs'
echo 'dkimnone.min 0'
echo 'dkimpass.label Valid DKIM-Sigs'
echo 'dkimpass.min 0'
echo 'dkiminvalid.label Invalid DKIM-Sigs'
echo 'dkiminvalid.min 0'
echo 'dkimfail.label Failed DKIM-Sigs'
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echo 'dkimfail.min 0'
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exit 0
fi
dkimnone=U
dkimpass=U
dkiminvalid=U
dkiminfail=U
TEMP_FILE=`mktempfile munin-dkimproxy_mails.XXXXXX`
if [ -n "$TEMP_FILE" -a -f "$TEMP_FILE" ]
then
$LOGTAIL ${MAIL_LOG} $STATEFILE | grep "DKIM verify - " > ${TEMP_FILE}
dkimnone=`grep 'DKIM verify - none' ${TEMP_FILE} | wc -l`
dkimpass=`grep 'DKIM verify - pass' ${TEMP_FILE} | wc -l`
dkiminvalid=`grep 'DKIM verify - invalid' ${TEMP_FILE} | wc -l`
dkimfail=`grep 'DKIM verify - fail' ${TEMP_FILE} | wc -l`
/bin/rm -f $TEMP_FILE
fi
echo "dkimnone.value ${dkimnone}"
echo "dkimpass.value ${dkimpass}"
echo "dkiminvalid.value ${dkiminvalid}"
echo "dkimfail.value ${dkimfail}"