smtp_hello_: improve compatibility
* support systems without time executable (if we can use bash time keyword) * use curl as smtp client if available * enable specifying different ports from 25 * enable specifying other test commands than "HELO localhost" (e.g. HELP, QUIT can also be used to test connections)
This commit is contained in:
Andreas Perhab
Lars Kruse
parent
72d1198553
commit
9bf3b9a299
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@ -2,9 +2,16 @@
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#
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# smtp_hello_ - munin plugin for measuring smtp hello response
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# Copyright (C) 2008 Marek Mahut <mmahut@fedoraproject.org>
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# Copyright (C) 2022 Andreas Perhab, WT-IO-IT GmbH <a.perhab@wtioit.at>
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#
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# Usage:
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# ln -s /usr/share/munin/plugins/smtp_hello_ /etc/munin/plugins/smtp_hello_mysmtpserver.example.com
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# ln -s /usr/share/munin/plugins/smtp_hello_ /etc/munin/plugins/smtp_hello_mysmtpserver.example.com
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#
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# Environment variables (optional):
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# SMTP_PORT: port number to use for connection, default is 25
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# SMTP_COMMAND: command to use to test the connection, default is "HELO localhost"
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# TIMEOUT_SECONDS: seconds to take at most for the test, default is 120
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#
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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@ -21,36 +28,111 @@
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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#$log$
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#Revision 1.0 2008/12/15 17:21:58 Marek Mahut (mmahut)
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#Initial commit.
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#Revision 2.0 2022/05/03 09:15:32 Andreas Perhab (ap-wtioit)
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#Improve compatiblity.
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#
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#%# family=auto
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#%# capabilities=autoconf
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. "$MUNIN_LIBDIR/plugins/plugin.sh"
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host=`basename $0 | sed 's/^smtp_hello_//g'`
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if [ "${MUNIN_DEBUG:-0}" == "1" ]; then
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set -x
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fi
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SMTP_COMMAND=${SMTP_COMMAND:-HELO localhost}
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SMTP_PORT=${SMTP_PORT:-25}
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TIMEOUT_SECONDS=${TIMEOUT_SECONDS:-120}
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# if we have curl all non-zero exit codes indicate an error
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status_warning=${status_warning:-0:0}
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# default warning time begins at half the timeout
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host_warning=${host_warning:-:$((TIMEOUT_SECONDS/2))}
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# default when we get values bigger than 99% of timeout we mark the value as critical
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host_critical=${host_critical:-:$((TIMEOUT_SECONDS * 99 / 100))}
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host=$(basename "$0" | sed 's/^smtp_hello_//g')
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time_executable=""
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if which time >/dev/null; then
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# use time executable found in PATH
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time_executable=$(which time)
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elif [ -x /usr/bin/time ] ; then
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# use time executable found in /usr/bin
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time_executable="/usr/bin/time"
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fi
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if [ "$time_executable" != "" ] ; then
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function take_the_time() {
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"$time_executable" -f "%e" "$@" 2>&1 | tail -n 1
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return "${PIPESTATUS[0]}"
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}
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elif { time echo; } >/dev/null 2>&1; then
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# if we cannot find time executable but time keyword is successful we use the keyword
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function take_the_time() {
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# we use LC_ALL=C to force . as decimal separator on systems where LC_ is set to a language that uses ,
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# to limit the effect of LC_ALL=C and TIMEFORMAT, as well as to be able to redirect stderr of the time keyword
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# we use a subshell here
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(
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TIMEFORMAT='%R'
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LC_ALL=C
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time "$@" 1>/dev/null
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) 2>&1
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return $?
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}
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fi
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nc_executable=""
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if which nc >/dev/null ; then
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# use nc from PATH
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nc_executable=$(which nc)
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elif [ -x /usr/bin/nc ] ; then
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# as fallback use /usr/bin/nc if found
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nc_executable="/usr/bin/nc"
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fi
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if which curl >/dev/null && curl_version_info=$(curl --version) && [[ "$curl_version_info" == *" smtp "* ]]; then
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curl_with_smtp_support=1
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fi
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if [ "$1" == "config" ]; then
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echo "graph_title smtp response time"
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echo "graph_vlabel response in sec"
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echo "graph_period minute"
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echo "graph_category Network"
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echo "graph_args --base 1000 --lower-limit 0"
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echo "host.label $host"
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echo "graph_title smtp response time"
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echo "graph_vlabel response in sec"
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echo "graph_period minute"
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echo "graph_category network"
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echo "graph_args --base 1000 --lower-limit 0"
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echo "host.label $host"
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print_warning "host"
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print_critical "host"
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if [ "$curl_with_smtp_support" == "1" ] ; then
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echo "status.label $host smtp success"
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print_warning "status"
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print_critical "status"
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fi
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elif [ "$1" == "autoconf" ]; then
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if [ -x /usr/bin/time ] && [ -x /usr/bin/nc ]; then
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echo "yes"
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else
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echo "no (/usr/bin/time or /usr/bin/nc missing)"
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fi
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exit 0
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if [ "$take_the_time" != "" ] && [ -x "$nc_executable" ]; then
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echo "yes"
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else
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echo "no (/usr/bin/time or /usr/bin/nc missing)"
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fi
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exit 0
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else
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response=`echo HELO localhost | /usr/bin/time -f "%e" nc -C -w 120 $host 25 2>&1 | tail -n 1`
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echo "host.value $response"
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if [ "$curl_with_smtp_support" == "1" ] ; then
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value=$(take_the_time curl --silent -X "$SMTP_COMMAND" --max-time "$TIMEOUT_SECONDS" "smtp://$host:$SMTP_PORT/")
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status=$?
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else
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# Note: "HELO localhost" only works if the SMTP server terminates the connection when presenting the HELO line
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# if you have troubles here, try installing curl (with smtp support), and we will use a proper smtp client
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# implementation. alternatively you can also set the SMTP_COMMAND environment variable to QUIT
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value=$(echo "$SMTP_COMMAND" | take_the_time "$nc_executable" -C -w "$TIMEOUT_SECONDS" "$host" "$SMTP_PORT")
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# with the simple echo command we would need to check a lot of conditions to determine a successful status
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# if you want this feature, install curl instead
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status=""
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fi
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echo "host.value $value"
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if [ -n "$status" ] ; then
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echo "status.value $status"
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fi
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fi
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