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https://github.com/mailcow/mailcow-dockerized.git
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1469953b52
alpine does not output ms using date, therefore we use perl to get a more accurate measurement of the dns response time. The script output is now even more similar to nagios check_dns.
39 lines
1 KiB
Bash
Executable file
39 lines
1 KiB
Bash
Executable file
#!/bin/sh
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while getopts "H:s:" opt; do
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case "$opt" in
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H) HOST="$OPTARG" ;;
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s) SERVER="$OPTARG" ;;
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*) echo "Usage: $0 -H host -s server"; exit 3 ;;
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esac
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done
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if [ -z "$SERVER" ]; then
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echo "No DNS Server provided"
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exit 3
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fi
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if [ -z "$HOST" ]; then
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echo "No host to test provided"
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exit 3
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fi
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# run dig and measure the time it takes to run
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START_TIME=$(perl -MTime::HiRes -e 'print Time::HiRes::time')
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dig_output=$(dig +short +timeout=2 +tries=1 "$HOST" @"$SERVER" 2>/dev/null)
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dig_rc=$?
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END_TIME=$(perl -MTime::HiRes -e 'print Time::HiRes::time')
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dig_output_ips=$(echo "$dig_output" | grep -E '^[0-9.]+$' | sort | paste -sd ',' -)
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ELAPSED_TIME=$(perl -e "printf('%.3f', $END_TIME - $START_TIME)")
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# validate and perform nagios like output and exit codes
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if [ $dig_rc -ne 0 ] || [ -z "$dig_output" ]; then
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echo "Domain $HOST was not found by the server"
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exit 2
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elif [ $dig_rc -eq 0 ]; then
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echo "DNS OK: $ELAPSED_TIME seconds response time. $HOST returns $dig_output_ips"
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exit 0
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else
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echo "Unknown error"
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exit 3
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fi
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