#!/bin/sh

# Sendmail and Procmail log file analyzer

# If no parameters are given, use current log file
if [ ${#} = 0 ]; then
    SUFFIX=""
    SUBDIR=""
elif [ $# -eq 1 ]; then
    SUFFIX=".$1"
    SUBDIR="backup"
else
    echo "Usage: $0 [log file number]"
    exit 1
fi


SM_LOG_FILE=/var/log/${SUBDIR}/mail.log${SUFFIX}
PM_LOG_FILE=/var/log/${SUBDIR}/procmail.log${SUFFIX}


# Computes a ratio
# arg 1: numerator
# arg 2: denumerator
hv_ratio()
{
    echo $(( ( ( ${1} * 100000 ) / ${2} ) / 1000 ))
}


# Sendmail (MTA) statistics
SM_REJECTED=$(cat ${SM_LOG_FILE} | grep 'ruleset=' | wc -l)
SM_ACCEPTED=$(cat ${SM_LOG_FILE} | grep 'stat=Sent' | grep 'mailer=local' | wc -l)
SM_TOTAL=$(( ${SM_REJECTED} + ${SM_ACCEPTED} ))

# Procmail (MDA) statistics
SPAM_COUNT=$(cat ${PM_LOG_FILE} | grep 'procmail: Match on \"\^X-Spam-Status: Yes' | wc -l)
HAM_COUNT=$(cat ${PM_LOG_FILE} | grep 'procmail: No match on \"\^X-Spam-Status: Yes' | wc -l)
SA_TOTAL=$(( ${SPAM_COUNT} + ${HAM_COUNT} ))

echo "Sendmail statistics (MTA):"
echo "  Accepted: $((${SM_ACCEPTED}))"
echo "  Total:    ${SM_TOTAL}"
echo "  Ratio:    $(hv_ratio ${SM_ACCEPTED} ${SM_TOTAL})%"
echo "SpamAssassin statistics:"
echo "  Spam:     $((${SPAM_COUNT}))"
echo "  Total:    ${SA_TOTAL}"
echo "  Ratio:    $(hv_ratio ${SPAM_COUNT} ${SA_TOTAL})%"

exit 0