178 lines
4.0 KiB
Bash
Executable File
178 lines
4.0 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Use this script to test if a given TCP host/port are available
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cmdname=$(basename $0)
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echoerr() { if [[ $QUIET -ne 1 ]]; then echo "$@" 1>&2; fi }
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usage()
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{
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cat << USAGE >&2
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Usage:
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$cmdname host:port [-s] [-t timeout] [-- command args]
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-h HOST | --host=HOST Host or IP under test
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-p PORT | --port=PORT TCP port under test
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Alternatively, you specify the host and port as host:port
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-s | --strict Only execute subcommand if the test succeeds
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-q | --quiet Don't output any status messages
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-t TIMEOUT | --timeout=TIMEOUT
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Timeout in seconds, zero for no timeout
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-- COMMAND ARGS Execute command with args after the test finishes
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USAGE
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exit 1
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}
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wait_for()
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{
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if [[ $TIMEOUT -gt 0 ]]; then
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echoerr "$cmdname: waiting $TIMEOUT seconds for $HOST:$PORT"
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else
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echoerr "$cmdname: waiting for $HOST:$PORT without a timeout"
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fi
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start_ts=$(date +%s)
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while :
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do
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if [[ $ISBUSY -eq 1 ]]; then
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nc -z $HOST $PORT
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result=$?
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else
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(echo > /dev/tcp/$HOST/$PORT) >/dev/null 2>&1
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result=$?
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fi
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if [[ $result -eq 0 ]]; then
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end_ts=$(date +%s)
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echoerr "$cmdname: $HOST:$PORT is available after $((end_ts - start_ts)) seconds"
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break
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fi
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sleep 1
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done
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return $result
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}
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wait_for_wrapper()
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{
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# In order to support SIGINT during timeout: http://unix.stackexchange.com/a/57692
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if [[ $QUIET -eq 1 ]]; then
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timeout $BUSYTIMEFLAG $TIMEOUT $0 --quiet --child --host=$HOST --port=$PORT --timeout=$TIMEOUT &
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else
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timeout $BUSYTIMEFLAG $TIMEOUT $0 --child --host=$HOST --port=$PORT --timeout=$TIMEOUT &
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fi
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PID=$!
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trap "kill -INT -$PID" INT
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wait $PID
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RESULT=$?
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if [[ $RESULT -ne 0 ]]; then
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echoerr "$cmdname: timeout occurred after waiting $TIMEOUT seconds for $HOST:$PORT"
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fi
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return $RESULT
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}
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# process arguments
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while [[ $# -gt 0 ]]
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do
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case "$1" in
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*:* )
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hostport=(${1//:/ })
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HOST=${hostport[0]}
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PORT=${hostport[1]}
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shift 1
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;;
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--child)
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CHILD=1
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shift 1
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;;
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-q | --quiet)
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QUIET=1
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shift 1
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;;
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-s | --strict)
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STRICT=1
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shift 1
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;;
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-h)
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HOST="$2"
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if [[ $HOST == "" ]]; then break; fi
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shift 2
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;;
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--host=*)
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HOST="${1#*=}"
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shift 1
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;;
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-p)
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PORT="$2"
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if [[ $PORT == "" ]]; then break; fi
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shift 2
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;;
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--port=*)
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PORT="${1#*=}"
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shift 1
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;;
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-t)
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TIMEOUT="$2"
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if [[ $TIMEOUT == "" ]]; then break; fi
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shift 2
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;;
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--timeout=*)
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TIMEOUT="${1#*=}"
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shift 1
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;;
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--)
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shift
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CLI=("$@")
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break
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;;
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--help)
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usage
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;;
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*)
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echoerr "Unknown argument: $1"
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usage
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;;
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esac
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done
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if [[ "$HOST" == "" || "$PORT" == "" ]]; then
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echoerr "Error: you need to provide a host and port to test."
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usage
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fi
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TIMEOUT=${TIMEOUT:-15}
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STRICT=${STRICT:-0}
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CHILD=${CHILD:-0}
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QUIET=${QUIET:-0}
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# check to see if timeout is from busybox?
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# check to see if timeout is from busybox?
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TIMEOUT_PATH=$(realpath $(which timeout))
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if [[ $TIMEOUT_PATH =~ "busybox" ]]; then
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ISBUSY=1
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BUSYTIMEFLAG="-t"
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else
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ISBUSY=0
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BUSYTIMEFLAG=""
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fi
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if [[ $CHILD -gt 0 ]]; then
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wait_for
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RESULT=$?
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exit $RESULT
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else
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if [[ $TIMEOUT -gt 0 ]]; then
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wait_for_wrapper
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RESULT=$?
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else
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wait_for
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RESULT=$?
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fi
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fi
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if [[ $CLI != "" ]]; then
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if [[ $RESULT -ne 0 && $STRICT -eq 1 ]]; then
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echoerr "$cmdname: strict mode, refusing to execute subprocess"
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exit $RESULT
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fi
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exec "${CLI[@]}"
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else
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exit $RESULT
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fi
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