#!/usr/bin/ksh
# Copyright (C) 2019 Checkmk GmbH - License: GNU General Public License v2
# This file is part of Checkmk (https://checkmk.com). It is subject to the terms and
# conditions defined in the file COPYING, which is part of this source code package.

# Reason for this no-op: shellcheck disable=... before the first command disables the error for the
# entire script.
:

# Disable unused variable error (needed to keep track of version)
# shellcheck disable=SC2034
CMK_VERSION="2.3.0p38"

# Logfile monitoring for AIX via errpt
#
# This plugin will send all new lines reported by
# errpt to the monitoring server in the form of a
# logwatch section.
# On the monitoring server side this will appear to
# be a monitored logfile by the name 'errorlog'.
# Every encoutered line will be reported as 'CRIT'
#

## Output of errpt looks like this, newest first
## (timestamp is month-day-hour-minute-year):
# IDENTIFIER TIMESTAMP  T C RESOURCE_NAME  DESCRIPTION
# 8650BE3F   0820122810 I H ent2           ETHERCHANNEL RECOVERY
# F3846E13   0820122510 P H ent2           ETHERCHANNEL FAILOVER
# 8650BE3F   0820104410 I H ent2           ETHERCHANNEL RECOVERY
# F3846E13   0820093810 P H ent2           ETHERCHANNEL FAILOVER
# 8650BE3F   0820090910 I H ent2           ETHERCHANNEL RECOVERY
#

MK_ERRPT_AIX_STATE="$MK_VARDIR/mk_errpt_aix.last_reported"

# file has been renamed in version 1.7.0i1
OLD_STATE_FILE="$MK_VARDIR/mk_logwatch_aix.last_reported"
if [ -f "$OLD_STATE_FILE" ] && [ ! -f "$MK_ERRPT_AIX_STATE" ]; then
    mv "$OLD_STATE_FILE" "$MK_ERRPT_AIX_STATE"
fi

echo "<<<logwatch>>>"
echo "[[[errorlog]]]"

# the last line we already reported (may be empty)
LINE=$(tail -n1 "$MK_ERRPT_AIX_STATE" 2>/dev/null)

if [ "$LINE" ]; then # get rid of all lines after that:
    OUT=$(errpt | awk -v line="$LINE" '($0 == line) {exit}; ($0 != line) && (NR>1) {printf "C %s\n", $0}')
else # LINE is empty -> report all
    OUT=$(errpt | awk '(NR>1) {printf "C %s\n", $0}')
fi

if [ "$OUT" ]; then
    # output data; if successful, remember most recent
    echo "$OUT" && echo "$OUT" | head -n1 | sed 's/^C\ //' >"$MK_ERRPT_AIX_STATE"
fi