#!/bin/bash
# Check_MK Agent for Linux
# +------------------------------------------------------------------+
# |             ____ _               _        __  __ _  __           |
# |            / ___| |__   ___  ___| | __   |  \/  | |/ /           |
# |           | |   | '_ \ / _ \/ __| |/ /   | |\/| | ' /            |
# |           | |___| | | |  __/ (__|   <    | |  | | . \            |
# |            \____|_| |_|\___|\___|_|\_\___|_|  |_|_|\_\           |
# |                                                                  |
# | Copyright Mathias Kettner 2014             mk@mathias-kettner.de |
# +------------------------------------------------------------------+
#
# This file is part of Check_MK.
# The official homepage is at http://mathias-kettner.de/check_mk.
#
# check_mk 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 in version 2.  check_mk is  distributed
# in the hope that it will be useful, but WITHOUT ANY WARRANTY;  with-
# out even the implied warranty of  MERCHANTABILITY  or  FITNESS FOR A
# PARTICULAR PURPOSE. See the  GNU General Public License for more de-
# tails. You should have  received  a copy of the  GNU  General Public
# License along with GNU Make; see the file  COPYING.  If  not,  write
# to the Free Software Foundation, Inc., 51 Franklin St,  Fifth Floor,
# Boston, MA 02110-1301 USA.

# Remove locale settings to eliminate localized outputs where possible
export LC_ALL=C
unset LANG

export MK_LIBDIR=${MK_LIBDIR:-/usr/lib/check_mk_agent}
export MK_CONFDIR=${MK_CONFDIR:-/etc/check_mk}
export MK_VARDIR=${MK_VARDIR:-/var/lib/check_mk_agent}

# Optionally set a tempdir for all subsequent calls
#export TMPDIR=

# Provide information about the remote host. That helps when data
# is being sent only once to each remote host.
if [ "$REMOTE_HOST" ]; then
    export REMOTE=$REMOTE_HOST
elif [ "$SSH_CLIENT" ]; then
    export REMOTE=${SSH_CLIENT%% *}
fi

# The package name gets patched for baked agents to either
# "check-mk-agent" or the name set by the "name of agent packages" rule
XINETD_SERVICE_NAME=check_mk

# Make sure, locally installed binaries are found
PATH=$PATH:/usr/local/bin

# All executables in PLUGINSDIR will simply be executed and their
# ouput appended to the output of the agent. Plugins define their own
# sections and must output headers with '<<<' and '>>>'
PLUGINSDIR=$MK_LIBDIR/plugins

# All executables in LOCALDIR will by executabled and their
# output inserted into the section <<<local>>>. Please
# refer to online documentation for details about local checks.
LOCALDIR=$MK_LIBDIR/local

# All files in SPOOLDIR will simply appended to the agent
# output if they are not outdated (see below)
SPOOLDIR=$MK_VARDIR/spool

# close standard input (for security reasons) and stderr when not
# explicitly in debug mode.
# When the nodes agent is executed by a e.g. docker node in a container,
# then don't close stdin, because the agent is piped through it in this
# case.
if [ "$1" = -d ]; then
    set -xv
elif [ -z "$MK_FROM_NODE" ]; then
    exec </dev/null 2>/dev/null
fi

# Detect whether or not the agent is being executed in a container
# environment.
if [ -f /.dockerenv ]; then
    IS_DOCKERIZED=1
elif grep container=lxc /proc/1/environ >/dev/null 2>&1; then
    # Works in lxc environment e.g. on Ubuntu bionic, but does not
    # seem to work in proxmox (see CMK-1561)
    IS_LXC_CONTAINER=1
elif grep 'lxcfs /proc/cpuinfo fuse.lxcfs' /proc/mounts >/dev/null 2>&1; then
    # Seems to work in proxmox
    IS_LXC_CONTAINER=1
else
    unset IS_DOCKERIZED
    unset IS_LXC_CONTAINER
fi

# Function to replace "if type [somecmd]" idiom
# 'command -v' tends to be more robust vs 'which' and 'type' based tests
inpath() {
    command -v "${1:?No command to test}" >/dev/null 2>&1
}

# Prefer (relatively) new /usr/bin/timeout from coreutils against
# our shipped waitmax. waitmax is statically linked and crashes on
# some Ubuntu versions recently.
if inpath timeout; then
    waitmax() {
        timeout "$@"
    }
    export -f waitmax
fi

if [ -f "$MK_CONFDIR/encryption.cfg" ]; then
    # shellcheck source=/dev/null
    . "$MK_CONFDIR/encryption.cfg"
fi

if [ "$ENCRYPTED" == "yes" ]; then
    OPENSSL_VERSION=$(openssl version | awk '{print $2}' | awk -F . '{print (($1 * 100) + $2) * 100+ $3}')
    if [ $OPENSSL_VERSION -ge 10000 ]; then
        echo -n "02"
        exec > >(openssl enc -aes-256-cbc -md sha256 -k "$PASSPHRASE" -nosalt)
    else
        echo -n "00"
        exec > >(openssl enc -aes-256-cbc -md md5 -k "$PASSPHRASE" -nosalt)
    fi
fi

RTC_PLUGINS=""
if [ -e "$MK_CONFDIR/real_time_checks.cfg" ]; then
    # shellcheck source=/dev/null
    . "$MK_CONFDIR/real_time_checks.cfg"
fi

#
# CHECK SECTIONS
#

section_mem() {
    if [ -z "$IS_DOCKERIZED" ]; then
        echo '<<<mem>>>'
        grep -E -v '^Swap:|^Mem:|total:' </proc/meminfo
    else
        echo '<<<docker_container_mem>>>'
        cat /sys/fs/cgroup/memory/memory.stat
        echo "usage_in_bytes $(cat /sys/fs/cgroup/memory/memory.usage_in_bytes)"
        echo "limit_in_bytes $(cat /sys/fs/cgroup/memory/memory.limit_in_bytes)"
        grep -F 'MemTotal:' /proc/meminfo
    fi
}

section_cpu() {
    if [ "$(uname -m)" = "armv7l" ]; then
        CPU_REGEX='^processor'
    else
        CPU_REGEX='^CPU|^processor'
    fi
    NUM_CPUS=$(grep -c -E $CPU_REGEX </proc/cpuinfo)

    if [ -z "$IS_DOCKERIZED" ] && [ -z "$IS_LXC_CONTAINER" ]; then
        echo '<<<cpu>>>'
        echo "$(cat /proc/loadavg) $NUM_CPUS"
        if [ -f "/proc/sys/kernel/threads-max" ]; then
            cat /proc/sys/kernel/threads-max
        fi
    else
        if [ -n "$IS_DOCKERIZED" ]; then
            echo '<<<docker_container_cpu>>>'
        else
            echo '<<<lxc_container_cpu>>>'
        fi
        grep "^cpu " /proc/stat
        echo "num_cpus $NUM_CPUS"
        cat /sys/fs/cgroup/cpuacct/cpuacct.stat
    fi
}

section_uptime() {
    echo '<<<uptime>>>'
    if [ -z "$IS_DOCKERIZED" ]; then
        cat /proc/uptime
    else
        echo "$(($(date +%s) - $(stat -c %Z /dev/pts)))"
    fi
}

# Print out Partitions / Filesystems. (-P gives non-wrapped POSIXed output)
# Heads up: NFS-mounts are generally supressed to avoid agent hangs.
# If hard NFS mounts are configured or you have too large nfs retry/timeout
# settings, accessing those mounts from the agent would leave you with
# thousands of agent processes and, ultimately, a dead monitored system.
# These should generally be monitored on the NFS server, not on the clients.
section_df() {
    if [ -n "$IS_DOCKERIZED" ]; then
        return
    fi

    # The exclusion list is getting a bit of a problem.
    # -l should hide any remote FS but seems to be all but working.
    local excludefs
    excludefs="-x smbfs -x cifs -x iso9660 -x udf -x nfsv4 -x nfs -x mvfs -x prl_fs -x squashfs -x devtmpfs"
    if [ -z "$IS_LXC_CONTAINER" ]; then
        excludefs+=" -x zfs"
    fi

    echo '<<<df>>>'
    # We really *need* word splitting below!
    # shellcheck disable=SC2086
    df -PTlk ${excludefs} | sed 1d

    # df inodes information
    echo '<<<df>>>'
    echo '[df_inodes_start]'
    # We really *need* word splitting below!
    # shellcheck disable=SC2086
    df -PTli ${excludefs} | sed 1d
    echo '[df_inodes_end]'
}

sections_systemd() {
    if inpath systemctl; then
        echo '<<<systemd_units>>>'
        echo "[list-unit-files]"
        systemctl list-unit-files --no-pager
        echo "[all]"
        systemctl --all --no-pager | sed '/^$/q'
    fi
}

run_mrpe() {
    local descr=$1
    shift
    local cmdline=$*

    echo '<<<mrpe>>>'

    PLUGIN=${cmdline%% *}
    OUTPUT=$(eval "$cmdline")

    echo -n "(${PLUGIN##*/}) $descr $? $OUTPUT" | tr \\n \\1
    echo
}

export -f run_mrpe

# Runs a command asynchronous by use of a cache file. Usage:
# run_cached [-s] NAME MAXAGE
#   -s creates the section header <<<$NAME>>>
#   -m mrpe-mode: stores exit code with the cache
#   -ma mrpe-mode with age: stores exit code with the cache and adds the cache age
#   NAME is the name of the section (also used as cache file name)
#   MAXAGE is the maximum cache livetime in seconds
run_cached() {
    local NOW
    NOW=$(date +%s)
    local section=
    local mrpe=0
    local append_age=0
    # TODO: this function is unable to handle mulitple args at once
    #       for example: -s -m won't work, it is read as single token "-s -m"
    if [ "$1" = -s ]; then
        local section="echo '<<<$2:cached($NOW,$3)>>>' ; "
        shift
    fi
    if [ "$1" = -m ]; then
        local mrpe=1
        shift
    fi
    if [ "$1" = "-ma" ]; then
        local mrpe=1
        local append_age=1
        shift
    fi
    local NAME=$1
    local MAXAGE=$2
    shift 2
    local CMDLINE=$section$*

    if [ ! -d "$MK_VARDIR/cache" ]; then mkdir -p "$MK_VARDIR/cache"; fi
    if [ "$mrpe" = 1 ]; then
        CACHEFILE="$MK_VARDIR/cache/mrpe_$NAME.cache"
    else
        CACHEFILE="$MK_VARDIR/cache/$NAME.cache"
    fi

    # Check if the creation of the cache takes suspiciously long and kill the
    # process if the age (access time) of $CACHEFILE.new is twice the MAXAGE.
    # Output the evantually already cached section anyways and start the cache
    # update again.
    if [ -e "$CACHEFILE.new" ]; then
        local CF_ATIME
        CF_ATIME=$(stat -c %X "$CACHEFILE.new")
        if [ $((NOW - CF_ATIME)) -ge $((MAXAGE * 2)) ]; then
            # Kill the process still accessing that file in case
            # it is still running. This avoids overlapping processes!
            fuser -k -9 "$CACHEFILE.new" >/dev/null 2>&1
            rm -f "$CACHEFILE.new"
        fi
    fi

    # Check if cache file exists and is recent enough
    if [ -s "$CACHEFILE" ]; then
        local MTIME
        MTIME=$(stat -c %Y "$CACHEFILE")
        local AGE
        AGE=$((NOW - MTIME))
        if [ "$AGE" -le "$MAXAGE" ]; then local USE_CACHEFILE=1; fi
        # Output the file in any case, even if it is
        # outdated. The new file will not yet be available
        if [ $append_age -eq 1 ]; then
            # insert the cached-string before the pipe (first -e)
            # or, if no pipe found (-e t) append it (third -e),
            # but only once and on the second line (2!b) (first line is section header,
            # all further lines are long output)
            sed -e "2s/|/ (Cached: ${AGE}\/${MAXAGE}s)|/" -e t -e "2s/$/ (Cached: ${AGE}\/${MAXAGE}s)/" <"$CACHEFILE"
        else
            CACHE_INFO="cached($MTIME,$MAXAGE)"
            if [[ $NAME == local_* ]]; then
                sed -e "s/^/$CACHE_INFO /" "$CACHEFILE"
            else
                # insert the cache info in the section header (^= after '!'),
                # if none is present (^= before '!')
                sed -e '/^<<<.*\(:cached(\).*>>>/!s/^<<<\([^>]*\)>>>$/<<<\1:'"${CACHE_INFO}"'>>>/' "$CACHEFILE"
            fi
        fi
    fi

    # Cache file outdated and new job not yet running? Start it
    if [ -z "$USE_CACHEFILE" ] && [ ! -e "$CACHEFILE.new" ]; then
        # When the command fails, the output is throws away ignored
        if [ $mrpe -eq 1 ]; then
            echo "set -o noclobber ; exec > \"$CACHEFILE.new\" || exit 1 ; run_mrpe $NAME \"$CMDLINE\" && mv \"$CACHEFILE.new\" \"$CACHEFILE\" || rm -f \"$CACHEFILE\" \"$CACHEFILE.new\"" | nohup /bin/bash >/dev/null 2>&1 &
        else
            echo "set -o noclobber ; exec > \"$CACHEFILE.new\" || exit 1 ; $CMDLINE && mv \"$CACHEFILE.new\" \"$CACHEFILE\" || rm -f \"$CACHEFILE\" \"$CACHEFILE.new\"" | nohup /bin/bash >/dev/null 2>&1 &
        fi
    fi
}

# Make run_cached available for subshells (plugins, local checks, etc.)
export -f run_cached

# Implements Real-Time Check feature of the Check_MK agent which can send
# some section data in 1 second resolution. Useful for fast notifications and
# detailed graphing (if you configure your RRDs to this resolution).
run_real_time_checks() {
    PIDFILE=$MK_VARDIR/real_time_checks.pid
    echo $$ >"$PIDFILE"

    if [ "$PASSPHRASE" != "" ]; then
        # new mechanism to set the passphrase has priority
        RTC_SECRET=$PASSPHRASE
    fi

    if [ "$ENCRYPTED_RT" != "no" ]; then
        PROTOCOL=00
    else
        PROTOCOL=99
    fi

    while true; do
        # terminate when pidfile is gone or other Real-Time Check process started or configured timeout
        if [ ! -e "$PIDFILE" ] || [ "$(<"$PIDFILE")" -ne $$ ] || [ "$RTC_TIMEOUT" -eq 0 ]; then
            exit 1
        fi

        for SECTION in $RTC_SECTIONS; do
            # Be aware of maximum packet size. Maybe we need to check the size of the section
            # output and do some kind of nicer error handling.
            # 2 bytes: protocol version, 10 bytes: timestamp, rest: encrypted data
            # dd is used to concatenate the output of all commands to a single write/block => udp packet
            {
                echo -n $PROTOCOL
                date +%s | tr -d '\n'
                if [ "$ENCRYPTED_RT" != "no" ]; then
                    export RTC_SECRET=$RTC_SECRET
                    section_"$SECTION" | openssl enc -aes-256-cbc -md md5 -pass env:RTC_SECRET -nosalt
                else
                    section_"$SECTION"
                fi
            } | dd bs=9999 iflag=fullblock 2>/dev/null >"/dev/udp/${REMOTE}/${RTC_PORT}"
        done

        # Plugins
        if cd "$PLUGINSDIR"; then
            for PLUGIN in $RTC_PLUGINS; do
                if [ ! -f $PLUGIN ]; then
                    continue
                fi

                # Be aware of maximum packet size. Maybe we need to check the size of the section
                # output and do some kind of nicer error handling.
                # 2 bytes: protocol version, 10 bytes: timestamp, rest: encrypted data
                # dd is used to concatenate the output of all commands to a single write/block => udp packet
                {
                    echo -n $PROTOCOL
                    date +%s | tr -d '\n'
                    if [ "$ENCRYPTED_RT" != "no" ]; then
                        export RTC_SECRET=$RTC_SECRET
                        ./$PLUGIN | openssl enc -aes-256-cbc -md md5 -pass env:RTC_SECRET -nosalt
                    else
                        ./"$PLUGIN"
                    fi
                } | dd bs=9999 iflag=fullblock 2>/dev/null >"/dev/udp/${REMOTE}/${RTC_PORT}"
            done
        fi

        sleep 1
        RTC_TIMEOUT=$((RTC_TIMEOUT - 1))
    done
}

echo "<<<check_mk>>>"
echo "Version: 1.6.0p25"
echo "AgentOS: linux"
echo "Hostname: $(hostname)"
echo "AgentDirectory: $MK_CONFDIR"
echo "DataDirectory: $MK_VARDIR"
echo "SpoolDirectory: $SPOOLDIR"
echo "PluginsDirectory: $PLUGINSDIR"
echo "LocalDirectory: $LOCALDIR"

# If we are called via xinetd, try to find only_from configuration
if [ -n "$REMOTE_HOST" ]; then
    echo -n 'OnlyFrom: '
    sed -n '/^service[[:space:]]*'$XINETD_SERVICE_NAME'/,/}/s/^[[:space:]]*only_from[[:space:]]*=[[:space:]]*\(.*\)/\1/p' /etc/xinetd.d/* | head -n1
    echo
fi

section_df

sections_systemd

# Filesystem usage for ZFS
if inpath zfs; then
    echo '<<<zfsget:sep(9)>>>'
    zfs get -t filesystem,volume -Hp name,quota,used,avail,mountpoint,type 2>/dev/null
    echo '<<<zfsget>>>'
    echo '[df]'
    df -PTlk -t zfs | sed 1d
fi

# Check NFS mounts by accessing them with stat -f (System
# call statfs()). If this lasts more then 2 seconds we
# consider it as hanging. We need waitmax.
if inpath waitmax; then
    STAT_VERSION=$(stat --version | head -1 | cut -d" " -f4)
    STAT_BROKE="5.3.0"

    echo '<<<nfsmounts>>>'
    sed -n '/ nfs4\? /s/[^ ]* \([^ ]*\) .*/\1/p' </proc/mounts |
        sed 's/\\040/ /g' |
        while read -r MP; do
            if [ "$STAT_VERSION" != "$STAT_BROKE" ]; then
                waitmax -s 9 5 stat -f -c "$MP ok %b %f %a %s" "$MP" ||
                    echo "$MP hanging 0 0 0 0"
            else
                waitmax -s 9 5 stat -f -c "$MP ok %b %f %a %s" "$MP" &&
                    printf '\n' || echo "$MP hanging 0 0 0 0"
            fi
        done

    echo '<<<cifsmounts>>>'
    sed -n '/ cifs\? /s/[^ ]* \([^ ]*\) .*/\1/p' </proc/mounts |
        sed 's/\\040/ /g' |
        while read -r MP; do
            if [ ! -r "$MP" ]; then
                echo "$MP Permission denied"
            elif [ "$STAT_VERSION" != "$STAT_BROKE" ]; then
                waitmax -s 9 2 stat -f -c "$MP ok %b %f %a %s" "$MP" ||
                    echo "$MP hanging 0 0 0 0"
            else
                waitmax -s 9 2 stat -f -c "$MP ok %b %f %a %s" "$MP" &&
                    printf '\n' || echo "$MP hanging 0 0 0 0"
            fi
        done
fi

# Check mount options. Filesystems may switch to 'ro' in case
# of a read error.
echo '<<<mounts>>>'
grep ^/dev </proc/mounts | grep -v " squashfs "

if inpath ps; then
    # processes including username, without kernel processes
    echo '<<<ps>>>'
    echo 'dummy section -- refer to section ps_lnx'
    echo '<<<ps_lnx>>>'
    CGROUP=""
    if [ -e /sys/fs/cgroup ]; then
        CGROUP="cgroup:512,"
    fi
    echo "[header] $(ps ax -o "$CGROUP"user:32,vsz,rss,cputime,etime,pid,command --columns 10000)"
fi

# Memory usage
section_mem

# Load and number of processes
section_cpu

# Uptime
section_uptime

# New variant: Information about speed and state in one section
if inpath ip; then
    echo '<<<lnx_if>>>'
    echo "[start_iplink]"
    ip address
    echo "[end_iplink]"
fi

echo '<<<lnx_if:sep(58)>>>'
sed 1,2d /proc/net/dev
if inpath ethtool; then
    sed -e 1,2d /proc/net/dev | cut -d':' -f1 | sort | while read -r eth; do
        echo "[$eth]"
        ethtool "$eth" | grep -E '(Speed|Duplex|Link detected|Auto-negotiation):'
        echo -e "\tAddress: $(cat "/sys/class/net/$eth/address")\n"
    done
fi

# Current state of bonding interfaces
if [ -e /proc/net/bonding ]; then
    echo '<<<lnx_bonding:sep(58)>>>'
    pushd /proc/net/bonding >/dev/null
    head -v -n 1000 ./*
    popd >/dev/null
fi

# Same for Open vSwitch bonding
if inpath ovs-appctl; then
    BONDS=$(ovs-appctl bond/list)
    COL=$(echo "$BONDS" | awk '{for(i=1;i<=NF;i++) {if($i == "bond") printf("%d", i)} exit 0}')
    echo '<<<ovs_bonding:sep(58)>>>'
    for bond in $(echo "$BONDS" | sed -e 1d | cut -f"${COL}"); do
        echo "[$bond]"
        ovs-appctl bond/show "$bond"
    done
fi

# Number of TCP connections in the various states
if inpath waitmax; then
    echo '<<<tcp_conn_stats>>>'
    THIS=$(waitmax 5 cat /proc/net/tcp /proc/net/tcp6 2>/dev/null | awk ' /:/ { c[$4]++; } END { for (x in c) { print x, c[x]; } }')
    if [ $? == 0 ]; then
        echo "$THIS"
    elif inpath ss; then
        ss -ant | grep -v ^State | awk ' /:/ { c[$1]++; } END { for (x in c) { print x, c[x]; } }' |
            sed -e 's/^ESTAB/01/g;s/^SYN-SENT/02/g;s/^SYN-RECV/03/g;s/^FIN-WAIT-1/04/g;s/^FIN-WAIT-2/05/g;s/^TIME-WAIT/06/g;s/^CLOSED/07/g;s/^CLOSE-WAIT/08/g;s/^LAST-ACK/09/g;s/^LISTEN/0A/g;s/^CLOSING/0B/g;'
    fi
fi

# Linux Multipathing
if inpath multipath; then
    if [ -f /etc/multipath.conf ]; then
        echo '<<<multipath>>>'
        multipath -l
    fi
fi

# Performancecounter Platten
if [ -z "$IS_DOCKERIZED" ]; then
    echo '<<<diskstat>>>'
    date +%s
    grep -E ' (x?[shv]d[a-z]*[0-9]*|cciss/c[0-9]+d[0-9]+|emcpower[a-z]+|dm-[0-9]+|VxVM.*|mmcblk.*|dasd[a-z]*|bcache[0-9]+|nvme[0-9]+n[0-9]+) ' </proc/diskstats
    if inpath dmsetup; then
        echo '[dmsetup_info]'
        dmsetup info -c --noheadings --separator ' ' -o name,devno,vg_name,lv_name
    fi
    if [ -d /dev/vx/dsk ]; then
        echo '[vx_dsk]'
        stat -c "%t %T %n" /dev/vx/dsk/*/*
    fi
else
    echo '<<<docker_container_diskstat>>>'
    echo "[time]"
    date +%s
    for F in io_service_bytes io_serviced; do
        echo "[$F]"
        cat "/sys/fs/cgroup/blkio/blkio.throttle.$F"
    done
    echo "[names]"
    for F in /sys/block/*; do
        echo "${F##*/} $(cat "$F/dev")"
    done
fi

# Performancecounter Kernel
if [ -z "$IS_DOCKERIZED" ] && [ -z "$IS_LXC_CONTAINER" ]; then
    echo '<<<kernel>>>'
    date +%s
    cat /proc/vmstat /proc/stat
fi

# Hardware sensors via IPMI (need ipmitool)
if inpath ipmitool; then
    run_cached -s "ipmi:sep(124)" 300 "waitmax 300 ipmitool sensor list | grep -v 'command failed' | grep -E -v '^[^ ]+ na ' | grep -v ' discrete '"
    # readable discrete sensor states
    run_cached -s "ipmi_discrete:sep(124)" 300 "waitmax 300 ipmitool sdr elist compact"
fi

# IPMI data via ipmi-sensors (of freeipmi). Please make sure, that if you
# have installed freeipmi that IPMI is really support by your hardware.
if (type ipmi-sensors && ls /dev/ipmi*) &>/dev/null; then
    echo '<<<ipmi_sensors>>>'
    # Newer ipmi-sensors version have new output format; Legacy format can be used
    if ipmi-sensors --help | grep -q legacy-output; then
        IPMI_FORMAT="--legacy-output"
    else
        IPMI_FORMAT=""
    fi
    if ipmi-sensors --help | grep -q " \-\-groups"; then
        IPMI_GROUP_OPT="-g"
    else
        IPMI_GROUP_OPT="-t"
    fi

    # At least with ipmi-sensors 0.7.16 this group is Power_Unit instead of "Power Unit"
    run_cached -s ipmi_sensors 300 "for class in Temperature Power_Unit Fan; do
        ipmi-sensors $IPMI_FORMAT --sdr-cache-directory /var/cache $IPMI_GROUP_OPT \"\$class\" | sed -e 's/ /_/g' -e 's/:_\?/ /g' -e 's@ \([^(]*\)_(\([^)]*\))@ \2_\1@'
        # In case of a timeout immediately leave loop.
        if [ $? = 255 ]; then break ; fi
    done"
fi

# RAID status of Linux software RAID
echo '<<<md>>>'
cat /proc/mdstat

# RAID status of Linux RAID via device mapper
if inpath dmraid && DMSTATUS=$(waitmax 3 dmraid -r); then
    echo '<<<dmraid>>>'

    # Output name and status
    waitmax 20 dmraid -s | grep -e ^name -e ^status

    # Output disk names of the RAID disks
    DISKS=$(echo "$DMSTATUS" | cut -f1 -d":")

    for disk in $DISKS; do
        device=$(cat /sys/block/"$(basename "$disk")"/device/model)
        status=$(echo "$DMSTATUS" | grep "^${disk}")
        echo "${status} Model: ${device}"
    done
fi

# RAID status of LSI controllers via cfggen
if inpath cfggen; then
    echo '<<<lsi>>>'
    cfggen 0 DISPLAY |
        grep -E '(Target ID|State|Volume ID|Status of volume)[[:space:]]*:' |
        sed -e 's/ *//g' -e 's/:/ /'
fi

# RAID status of LSI MegaRAID controller via MegaCli. You can download that tool from:
# http://www.lsi.com/downloads/Public/MegaRAID%20Common%20Files/8.02.16_MegaCLI.zip
if inpath MegaCli; then
    MegaCli_bin="MegaCli"
elif inpath MegaCli64; then
    MegaCli_bin="MegaCli64"
elif inpath megacli; then
    MegaCli_bin="megacli"
elif inpath storcli; then
    MegaCli_bin="storcli"
elif inpath storcli64; then
    MegaCli_bin="storcli64"
else
    MegaCli_bin="unknown"
fi

if [ "$MegaCli_bin" != "unknown" ]; then
    echo '<<<megaraid_pdisks>>>'
    for part in $($MegaCli_bin -EncInfo -aALL -NoLog </dev/null |
        sed -rn 's/:/ /g; s/[[:space:]]+/ /g; s/^ //; s/ $//; s/Number of enclosures on adapter ([0-9]+).*/adapter \1/g; /^(Enclosure|Device ID|adapter) [0-9]+$/ p'); do
        [ "$part" = adapter ] && echo ""
        [ "$part" = 'Enclosure' ] && echo -ne "\ndev2enc"
        echo -n " $part"
    done
    echo
    $MegaCli_bin -PDList -aALL -NoLog </dev/null |
        grep -E 'Enclosure|Raw Size|Slot Number|Device Id|Firmware state|Inquiry|Adapter'
    echo '<<<megaraid_ldisks>>>'
    $MegaCli_bin -LDInfo -Lall -aALL -NoLog </dev/null | grep -E 'Size|State|Number|Adapter|Virtual'
    echo '<<<megaraid_bbu>>>'
    $MegaCli_bin -AdpBbuCmd -GetBbuStatus -aALL -NoLog </dev/null | grep -v Exit
fi

# RAID status of 3WARE disk controller (by Radoslaw Bak)
if inpath tw_cli; then
    for C in $(tw_cli show | awk 'NR < 4 { next } { print $1 }'); do
        echo '<<<3ware_info>>>'
        tw_cli "/$C" show all | grep -E 'Model =|Firmware|Serial'
        echo '<<<3ware_disks>>>'
        tw_cli "/$C" show drivestatus | grep -E 'p[0-9]' | sed "s/^/$C\//"
        echo '<<<3ware_units>>>'
        tw_cli "/$C" show unitstatus | grep -E 'u[0-9]' | sed "s/^/$C\//"
    done
fi

# RAID controllers from areca (Taiwan)
# cli64 can be found at ftp://ftp.areca.com.tw/RaidCards/AP_Drivers/Linux/CLI/
if inpath cli64; then
    run_cached -s arc_raid_status 300 "cli64 rsf info | tail -n +3 | head -n -2"
fi

# VirtualBox Guests. Section must always been output. Otherwise the
# check would not be executed in case no guest additions are installed.
# And that is something the check wants to detect
echo '<<<vbox_guest>>>'
if inpath VBoxControl && lsmod | grep vboxguest >/dev/null 2>&1; then
    VBoxControl -nologo guestproperty enumerate | cut -d, -f1,2
    [ "${PIPESTATUS[0]}" = 0 ] || echo "ERROR"
fi

# OpenVPN Clients. Currently we assume that the configuration # is in
# /etc/openvpn. We might find a safer way to find the configuration later.
if [ -e /etc/openvpn/openvpn-status.log ]; then
    echo '<<<openvpn_clients:sep(44)>>>'
    sed -n -e '/CLIENT LIST/,/ROUTING TABLE/p' </etc/openvpn/openvpn-status.log |
        sed -e 1,3d -e '$d'
fi

# Time synchronization with NTP
if inpath ntpq; then
    # remove heading, make first column space separated
    run_cached -s ntp 30 "waitmax 5 ntpq -np | sed -e 1,2d -e 's/^\(.\)/\1 /' -e 's/^ /%/' || true"
fi

# Time synchronization with Chrony
if inpath chronyc; then
    # Force successful exit code. Otherwise section will be missing if daemon not running
    #
    # The "| cat" has been added for some kind of regression in RedHat 7.5. The
    # SELinux rules shipped with that release were denying the chronyc call
    # without cat.
    run_cached -s chrony 30 "waitmax 5 chronyc -n tracking | cat || true"
fi

if inpath nvidia-settings && [ -S /tmp/.X11-unix/X0 ]; then
    echo '<<<nvidia>>>'
    for var in GPUErrors GPUCoreTemp; do
        DISPLAY=:0 waitmax 2 nvidia-settings -t -q $var | sed "s/^/$var: /"
    done
fi

if [ -z "$IS_DOCKERIZED" ] && [ -z "$IS_LXC_CONTAINER" ] && [ -e /proc/drbd ]; then
    echo '<<<drbd>>>'
    cat /proc/drbd
    cat /sys/kernel/debug/drbd/resources/*/connections/*/0/proc_drbd 2>/dev/null
fi

# Heartbeat monitoring
# Different handling for heartbeat clusters with and without CRM
# for the resource state
if [ -S /var/run/heartbeat/crm/cib_ro -o -S /var/run/crm/cib_ro ] || pgrep "^(crmd|pacemaker-contr)$" >/dev/null 2>&1; then
    echo '<<<heartbeat_crm>>>'
    TZ=UTC crm_mon -1 -r | grep -v ^$ | sed 's/^ //; /^\sResource Group:/,$ s/^\s//; s/^\s/_/g'
fi
if inpath cl_status; then
    echo '<<<heartbeat_rscstatus>>>'
    cl_status rscstatus

    echo '<<<heartbeat_nodes>>>'
    for NODE in $(cl_status listnodes); do
        if [ "$NODE" != "$(echo "$HOSTNAME" | tr '[:upper:]' '[:lower:]')" ]; then
            STATUS=$(cl_status nodestatus "$NODE")
            echo -n "$NODE $STATUS"
            for LINK in $(cl_status listhblinks "$NODE" 2>/dev/null); do
                echo -n " $LINK $(cl_status hblinkstatus "$NODE" "$LINK")"
            done
            echo
        fi
    done
fi

# Postfix mailqueue monitoring
# Determine the number of mails and their size in several postfix mail queues
read_postfix_queue_dirs() {
    postfix_queue_dir=$1
    if [ -n "$postfix_queue_dir" ]; then
        echo '<<<postfix_mailq>>>'
        echo "[[[${2}]]]"
        for queue in deferred active; do
            count=$(find "${postfix_queue_dir}/$queue" -type f | wc -l)
            size=$(du -s "${postfix_queue_dir}/$queue" | awk '{print $1 }')
            if [ -z "$size" ]; then
                size=0
            fi
            if [ -z "$count" ]; then
                echo "Mail queue is empty"
            else
                echo "QUEUE_${queue} $size $count"
            fi
        done
    fi
}

# Postfix mailqueue monitoring
# Determine the number of mails and their size in several postfix mail queues
if inpath postconf; then
    # Check if multi_instance_directories exists in main.cf and is not empty
    # always takes the last entry, multiple entries possible
    multi_instances_dirs=$(postconf -c /etc/postfix 2>/dev/null | grep ^multi_instance_directories | sed 's/.*=[[:space:]]*//g')
    if [ -n "$multi_instances_dirs" ]; then
        for queue_dir in $multi_instances_dirs; do
            if [ -n "$queue_dir" ]; then
                postfix_queue_dir=$(postconf -c "$queue_dir" 2>/dev/null | grep ^queue_directory | sed 's/.*=[[:space:]]*//g')
                read_postfix_queue_dirs "$postfix_queue_dir" "$queue_dir"
            fi
        done
    fi
    # Always check for the default queue. It can exist even if multiple instances are configured
    read_postfix_queue_dirs "$(postconf -h queue_directory 2>/dev/null)"

elif [ -x /usr/sbin/ssmtp ]; then
    echo '<<<postfix_mailq>>>'
    mailq 2>&1 | sed 's/^[^:]*: \(.*\)/\1/' | tail -n 6

fi

# Postfix status monitoring. Can handle multiple instances.
if inpath postfix; then
    echo "<<<postfix_mailq_status:sep(58)>>>"
    for i in /var/spool/postfix*/; do
        if [ -e "$i/pid/master.pid" ]; then
            if [ -r "$i/pid/master.pid" ]; then
                postfix_pid=$(sed 's/ //g' <"$i/pid/master.pid") # handle possible spaces in output
                if readlink -- "/proc/${postfix_pid}/exe" | grep -q ".*postfix/\(s\?bin/\)\?master.*"; then
                    echo "$i:the Postfix mail system is running:PID:$postfix_pid" | sed 's/\/var\/spool\///g'
                else
                    echo "$i:PID file exists but instance is not running!" | sed 's/\/var\/spool\///g'
                fi
            else
                echo "$i:PID file exists but is not readable"
            fi
        else
            echo "$i:the Postfix mail system is not running" | sed 's/\/var\/spool\///g'
        fi
    done
fi

# Check status of qmail mailqueue
if inpath qmail-qstat; then
    echo "<<<qmail_stats>>>"
    qmail-qstat
fi

# Nullmailer queue monitoring
if inpath nullmailer-send && [ -d /var/spool/nullmailer/queue ]; then
    echo '<<<nullmailer_mailq>>>'
    COUNT=$(find /var/spool/nullmailer/queue -type f | wc -l)
    SIZE=$(du -s /var/spool/nullmailer/queue | awk '{print $1 }')
    echo "$SIZE $COUNT"
fi

# Check status of OMD sites and Check_MK Notification spooler
if inpath omd; then
    run_cached -s omd_status 60 "omd status --bare --auto || true"
    echo '<<<mknotifyd:sep(0)>>>'
    date +%s
    for statefile in /omd/sites/*/var/log/mknotifyd.state; do
        if [ -e "$statefile" ]; then
            site=${statefile%/var/log*}
            site=${site#/omd/sites/}
            echo "[$site]"
            grep -v '^#' <"$statefile"
        fi
    done

    echo '<<<omd_apache:sep(124)>>>'
    for statsfile in /omd/sites/*/var/log/apache/stats; do
        if [ -e "$statsfile" ]; then
            site=${statsfile%/var/log*}
            site=${site#/omd/sites/}
            echo "[$site]"
            cat "$statsfile"
            : >"$statsfile"
            # prevent next section to fail caused by a missing newline at the end of the statsfile
            echo
        fi
    done
fi

# Welcome the ZFS check on Linux
# We do not endorse running ZFS on linux if your vendor doesnt support it ;)
# check zpool status
if inpath zpool; then
    echo "<<<zpool_status>>>"
    zpool status -x
    echo "<<<zpool>>>"
    zpool list
fi

# Veritas Cluster Server
# Software is always installed in /opt/VRTSvcs.
# Secure mode must be off to allow root to execute commands
if [ -x /opt/VRTSvcs/bin/haclus ]; then
    echo "<<<veritas_vcs>>>"
    vcshost=$(hostname | cut -d. -f1)
    waitmax -s 9 2 /opt/VRTSvcs/bin/haclus -display -localclus | grep -e ClusterName -e ClusState
    waitmax -s 9 2 /opt/VRTSvcs/bin/hasys -display -attribute SysState
    waitmax -s 9 2 /opt/VRTSvcs/bin/hagrp -display -sys "$vcshost" -attribute State -localclus
    waitmax -s 9 2 /opt/VRTSvcs/bin/hares -display -sys "$vcshost" -attribute State -localclus
    waitmax -s 9 2 /opt/VRTSvcs/bin/hagrp -display -attribute TFrozen -attribute Frozen
fi

# Fileinfo-Check: put patterns for files into /etc/check_mk/fileinfo.cfg
perl -e '
use File::Glob "bsd_glob";
my @patterns = ();
foreach (bsd_glob("$ARGV[0]/fileinfo.cfg"), bsd_glob("$ARGV[0]/fileinfo.d/*")) {
    open my $handle, "<", $_ or next;
    while (<$handle>) {
        chomp;
        next if /^\s*(#|$)/;
        my $pattern = $_;
        $pattern =~ s/\$DATE:(.*?)\$/substr(`date +"$1"`, 0, -1)/eg;
        push @patterns, $pattern;
    }
    warn "error while reading $_: $!\n" if $!;
    close $handle;
}
exit if ! @patterns;

print "<<<fileinfo:sep(124)>>>\n", time, "\n[[[header]]]\nname|status|size|time\n[[[content]]]\n";

foreach (@patterns) {
    foreach (bsd_glob("$_")) {
        if (! -f) {
            print "$_|missing\n" if ! -d;
        } elsif (my @infos = stat) {
            print "$_|ok|$infos[7]|$infos[9]\n";
        } else {
            print "$_|stat failed: $!\n";
        }
    }
}
' -- "$MK_CONFDIR"

# Get stats about OMD monitoring cores running on this machine.
# Since cd is a shell builtin the check does not affect the performance
# on non-OMD machines.
if cd /omd/sites; then
    echo '<<<livestatus_status:sep(59)>>>'
    for site in *; do
        if [ -S "/omd/sites/$site/tmp/run/live" ]; then
            echo "[$site]"
            echo -e "GET status" |
                waitmax 3 "/omd/sites/$site/bin/unixcat" "/omd/sites/$site/tmp/run/live"
        fi
    done

    echo '<<<livestatus_ssl_certs:sep(124)>>>'
    for site in *; do
        echo "[$site]"
        for PEM_PATH in "/omd/sites/$site/etc/ssl/ca.pem" "/omd/sites/$site/etc/ssl/sites/$site.pem"; do
            if [ -f "$PEM_PATH" ]; then
                CERT_DATE=$(openssl x509 -enddate -noout -in "$PEM_PATH")
                CERT_DATE=${CERT_DATE/notAfter=/}
                echo "$PEM_PATH|$(date --date="$CERT_DATE" --utc +%s)"
            fi
        done
    done

    echo '<<<mkeventd_status:sep(0)>>>'
    for site in *; do
        if [ -S "/omd/sites/$site/tmp/run/mkeventd/status" ]; then
            echo "[\"$site\"]"
            echo -e "GET status\nOutputFormat: json" |
                waitmax 3 "/omd/sites/$site/bin/unixcat" "/omd/sites/$site/tmp/run/mkeventd/status"
        fi
    done
fi

# Collect states of configured Check_MK site backup jobs
if ls /omd/sites/*/var/check_mk/backup/*.state >/dev/null 2>&1; then
    echo "<<<mkbackup>>>"
    for F in /omd/sites/*/var/check_mk/backup/*.state; do
        SITE=${F#/*/*/*}
        SITE=${SITE%%/*}

        JOB_IDENT=${F%.state}
        JOB_IDENT=${JOB_IDENT##*/}

        if [ "$JOB_IDENT" != "restore" ]; then
            echo "[[[site:$SITE:$JOB_IDENT]]]"
            cat "$F"
            echo
        fi
    done
fi

# Collect states of configured CMA backup jobs
if inpath mkbackup && ls /var/lib/mkbackup/*.state >/dev/null 2>&1; then
    echo "<<<mkbackup>>>"
    for F in /var/lib/mkbackup/*.state; do
        JOB_IDENT=${F%.state}
        JOB_IDENT=${JOB_IDENT##*/}

        if [ "$JOB_IDENT" != "restore" ]; then
            echo "[[[system:$JOB_IDENT]]]"
            cat "$F"
            echo
        fi
    done
fi

# Get statistics about monitored jobs. Below the job directory there
# is a sub directory per user that ran a job. That directory must be
# owned by the user so that a symlink or hardlink attack for reading
# arbitrary files can be avoided.
if pushd "$MK_VARDIR/job" >/dev/null; then
    echo '<<<job>>>'
    for username in *; do
        if [ -d "$username" ] && cd "$username"; then
            if [ $EUID -eq 0 ]; then
                su -s "$SHELL" "$username" -c "head -n -0 -v *"
            else
                head -n -0 -v ./*
            fi
            cd ..
        fi
    done
    popd >/dev/null
fi

# Gather thermal information provided e.g. by acpi
# At the moment only supporting thermal sensors
if [ -z "$IS_DOCKERIZED" ] && [ -z "$IS_LXC_CONTAINER" ] && ls /sys/class/thermal/thermal_zone* >/dev/null 2>&1; then
    echo '<<<lnx_thermal:sep(124)>>>'
    for F in /sys/class/thermal/thermal_zone*; do
        line="${F##*/}"
        if [ ! -e "$F/mode" ]; then line="${line}|-"; else line="${line}|$(cat "$F"/mode)"; fi
        line="${line}|$(cat "$F"/{type,temp} | tr \\n "|")"
        for G in $(ls "$F"/trip_point_*_{temp,type}); do
            line="${line}$(tr <"$G" \\n "|")"
        done
        echo "${line%?}"
    done
fi

# Libelle Business Shadow
if inpath trd; then
    echo "<<<libelle_business_shadow:sep(58)>>>"
    trd -s
fi

# HTTP Accelerator Statistics
if inpath varnishstat; then
    echo "<<<varnish>>>"
    varnishstat -1
fi

# Proxmox Cluster
if inpath pvecm; then
    echo "<<<pvecm_status:sep(58)>>>"
    pvecm status
    echo "<<<pvecm_nodes>>>"
    pvecm nodes
fi

for HAPROXY_SOCK in /run/haproxy/admin.sock /var/lib/haproxy/stats; do
    if [ -r "$HAPROXY_SOCK" ] && inpath socat; then
        echo "<<<haproxy:sep(44)>>>"
        echo "show stat" | socat - "UNIX-CONNECT:$HAPROXY_SOCK"
    fi
done

# Start new liveupdate process in background on each agent execution. Starting
# a new live update process will terminate the old one automatically after
# max. 1 sec.
if [ -e "$MK_CONFDIR/real_time_checks.cfg" ]; then
    if [ -z "$REMOTE" ]; then
        echo "ERROR: \$REMOTE not specified. Not starting Real-Time Checks." >&2
    elif ! inpath openssl; then
        echo "ERROR: openssl command is missing. Not starting Real-Time Checks." >&2
    else
        run_real_time_checks >/dev/null &
    fi
fi

# MK's Remote Plugin Executor
if [ -e "$MK_CONFDIR/mrpe.cfg" ]; then
    grep -Ev '^[[:space:]]*($|#)' "$MK_CONFDIR/mrpe.cfg" |
        while read -r descr cmdline; do
            interval=
            args="-m"
            # NOTE: Due to an escaping-related bug in some old bash versions
            # (3.2.x), we have to use an intermediate variable for the pattern.
            pattern='\(([^\)]*)\)[[:space:]](.*)'
            if [[ $cmdline =~ $pattern ]]; then
                parameters=${BASH_REMATCH[1]}
                cmdline=${BASH_REMATCH[2]}

                # split multiple parameter assignments
                for par in $(echo "$parameters" | tr ":" "\n"); do
                    # split each assignment
                    key=$(echo "$par" | cut -d= -f1)
                    value=$(echo "$par" | cut -d= -f2)

                    if [ "$key" = "interval" ]; then
                        interval=$value
                    elif [ "$key" = "appendage" ]; then
                        args="-ma"
                    fi
                done
            fi

            if [ -z "$interval" ]; then
                run_mrpe "$descr" "$cmdline"
            else
                run_cached "$args" "$descr" "$interval" "$cmdline"
            fi
        done
fi

# MK's runas Executor
if [ -e "$MK_CONFDIR/runas.cfg" ]; then
    grep -Ev '^[[:space:]]*($|#)' "$MK_CONFDIR/runas.cfg" |
        while read -r type user include; do
            if [ -d "$include" -o \( "$type" == "mrpe" -a -f "$include" \) ]; then
                PREFIX=""
                if [ "$user" != "-" ]; then
                    PREFIX="su $user -c "
                fi

                # mrpe includes
                if [ "$type" == "mrpe" ]; then
                    grep -Ev '^[[:space:]]*($|#)' "$include" |
                        while read -r descr cmdline; do
                            interval=
                            # NOTE: Due to an escaping-related bug in some old bash
                            # versions (3.2.x), we have to use an intermediate variable
                            # for the pattern.
                            pattern='\(([^\)]*)\)[[:space:]](.*)'
                            if [[ $cmdline =~ $pattern ]]; then
                                parameters=${BASH_REMATCH[1]}
                                cmdline=${BASH_REMATCH[2]}

                                # split multiple parameter assignments
                                for par in $(echo "$parameters" | tr ":" "\n"); do
                                    # split each assignment
                                    IFS='=' read -r key value <<<"${par}"
                                    if [ "$key" = "interval" ]; then
                                        interval=$value
                                    # no other parameters supported currently
                                    fi
                                done
                            fi

                            if [ -n "$PREFIX" ]; then
                                cmdline="$PREFIX'$cmdline'"
                            fi
                            if [ -z "$interval" ]; then
                                run_mrpe "$descr" "$cmdline"
                            else
                                run_cached -m "$descr" "$interval" "$cmdline"
                            fi
                        done

                # local and plugin includes
                elif [ "$type" == "local" -o "$type" == "plugin" ]; then
                    if [ "$type" == "local" ]; then
                        echo "<<<local>>>"
                    fi

                    find "$include" -executable -type f |
                        while read -r filename; do
                            if [ -n "$PREFIX" ]; then
                                cmdline="$PREFIX\"$filename\""
                            else
                                cmdline=$filename
                            fi

                            $cmdline
                        done
                fi
            fi
        done
fi

is_valid_plugin() {
    # NOTE: Due to an escaping-related bug in some old bash versions
    # (3.2.x), we have to use an intermediate variable for the pattern.
    pattern='\.dpkg-(new|old|temp)$'
    #TODO Maybe we should change this mechanism
    # shellcheck disable=SC2015
    [[ -f "$1" && -x "$1" && ! "$1" =~ $pattern ]] && true || false
}

# Local checks
echo '<<<local>>>'
if cd "$LOCALDIR"; then
    for skript in ./*; do
        if is_valid_plugin "$skript"; then
            ./"$skript"
        fi
    done
    # Call some plugins only every X'th second
    for skript in [1-9]*/*; do
        if is_valid_plugin "$skript"; then
            run_cached "local_${skript//\//\\}" "${skript%/*}" "$skript"
        fi
    done
fi

# Plugins
if cd "$PLUGINSDIR"; then
    for skript in ./*; do
        if is_valid_plugin "$skript"; then
            ./"$skript"
        fi
    done
    # Call some plugins only every Xth second
    for skript in [1-9]*/*; do
        if is_valid_plugin "$skript"; then
            run_cached "plugins_${skript//\//\\}" "${skript%/*}" "$skript"
        fi
    done
fi

# Agent output snippets created by cronjobs, etc.
if [ -d "$SPOOLDIR" ] && [ -r "$SPOOLDIR" ]; then
    pushd "$SPOOLDIR" >/dev/null
    now=$(date +%s)

    for file in *; do
        test "$file" = "*" && break
        # output every file in this directory. If the file is prefixed
        # with a number, then that number is the maximum age of the
        # file in seconds. If the file is older than that, it is ignored.
        maxage=""
        part="$file"

        # Each away all digits from the front of the filename and
        # collect them in the variable maxage.
        while [ "${part/#[0-9]/}" != "$part" ]; do
            maxage=$maxage${part:0:1}
            part=${part:1}
        done

        # If there is at least one digit, than we honor that.
        if [ "$maxage" ]; then
            mtime=$(stat -c %Y "$file")
            if [ $((now - mtime)) -gt "$maxage" ]; then
                continue
            fi
        fi

        # Output the file
        cat "$file"
    done
    popd >/dev/null
fi