109 lines
4.0 KiB
Bash
109 lines
4.0 KiB
Bash
#!/usr/bin/env bash
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# ------------------------------------------------------------------------------
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# Copyright (c) 2013-2022 Geoffray Levasseur <fatalerrors@geoffray-levasseur.org>
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# Protected by the BSD3 license. Please read bellow for details.
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#
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# * Redistribution and use in source and binary forms,
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# * with or without modification, are permitted provided
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# * that the following conditions are met:
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# *
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# * Redistributions of source code must retain the above
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# * copyright notice, this list of conditions and the
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# * following disclaimer.
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# *
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# * Redistributions in binary form must reproduce the above
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# * copyright notice, this list of conditions and the following
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# * disclaimer in the documentation and/or other materials
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# * provided with the distribution.
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# *
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# * Neither the name of the copyright holder nor the names
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# * of any other contributors may be used to endorse or
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# * promote products derived from this software without
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# * specific prior written permission.
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# *
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# * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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# * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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# * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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# * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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# * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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# * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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# * OF SUCH DAMAGE.
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# ------------------------------------------------------------------------------
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# ------------------------------------------------------------------------------
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# Make non-IT peoples think you're busy doing something hard
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# Usage: busy [options] [pattern]
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# Options:
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# --delay=<ms> : add a delay between each line output (milliseconds)
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# pattern : the string to search for in the hexdump output (default is "ca fe")
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busy()
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{
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local pattern="ca fe" delay_ms=0
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local PARSED
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# Short: h, p:, d:
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# Long: help, pattern:, delay:
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PARSED=$(getopt -o hp:d: --long help,pattern:,delay: -n 'busy' -- "$@")
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if [[ $? -ne 0 ]]; then
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disp E "Invalid options, use \"busy --help\" to display usage."
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return 1
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fi
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eval set -- "$PARSED"
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while true; do
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case "$1" in
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-h|--help)
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printf "busy: Monitor /dev/urandom for a specific pattern.\n\n"
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printf "Usage: busy [options] [pattern]\n\n"
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printf "Options:\n"
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printf "\t-h, --help\t\tDisplay this help screen\n"
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printf "\t-p, --pattern PATTERN\tHex pattern to search (default: \"ca fe\")\n"
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printf "\t-d, --delay MS\t\tDelay between matches in milliseconds\n"
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return 0
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;;
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-p|--pattern)
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pattern="$2"
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shift 2
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;;
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-d|--delay)
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delay_ms="$2"
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if ! [[ "$delay_ms" =~ ^[0-9]+$ ]]; then
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disp E "Invalid delay: must be an integer (milliseconds)."
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return 1
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fi
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shift 2
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;;
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--)
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shift
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break
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;;
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*)
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disp E "Invalid option: $1"
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return 1
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;;
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esac
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done
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# If a pattern was provided as a positional argument (e.g., 'busy "ff 00"'),
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# it is captured here.
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[[ -n "$1" ]] && pattern="$1"
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# Convert milliseconds to seconds for 'sleep'
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local delay_s=$(awk "BEGIN { printf \"%.3f\", $delay_ms / 1000 }")
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# Monitor /dev/urandom
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cat /dev/urandom | hexdump -C | grep --line-buffered "$pattern" | \
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while read -r line; do
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echo "$line"
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[[ $delay_ms -gt 0 ]] && sleep "$delay_s"
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done
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}
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# ------------------------------------------------------------------------------
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# EOF
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