81 lines
2.2 KiB
Plaintext
81 lines
2.2 KiB
Plaintext
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#!/bin/bash
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# The Qubes OS Project, http://www.qubes-os.org
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#
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# Copyright (C) 2016 Patrick Schleizer <adrelanos@riseup.net>
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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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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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## Similar code as Boot Clock Randomization.
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## https://www.whonix.org/wiki/Boot_Clock_Randomization
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set -e
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## Get a random 0 or 1.
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## Will use this to decide to use plus or minus.
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##
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## Thanks to
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## http://linux.byexamples.com/archives/128/generating-random-numbers/
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ZERO_OR_ONE="$(( 0+($(od -An -N2 -i /dev/random) )%(0+2) ))"
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## Create a random number between 0 and 180.
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DELAY="$(( $(od -An -N2 -i /dev/random)%(180-0+1) ))"
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## Create a random number between 0 and 999999999.
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##
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## Thanks to
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## https://stackoverflow.com/questions/22887891/how-can-i-get-a-random-dev-random-number-between-0-and-999999999-in-bash
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NANOSECONDS="$(shuf -i0-999999999 -n1 --random-source=/dev/random)"
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## Examples NANOSECONDS:
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## 117752805
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## 38653957
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## Add leading zeros, because `date` expects 9 digits.
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NANOSECONDS="$(printf '%0*d\n' 9 "$NANOSECONDS")"
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## Using
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## printf '%0*d\n' 9 "38653957"
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## 38653957
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## becomes
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## 038653957
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## Examples NANOSECONDS:
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## 117752805
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## 038653957
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if [ "$ZERO_OR_ONE" = "0" ]; then
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PLUS_OR_MINUS="-"
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elif [ "$ZERO_OR_ONE" = "1" ]; then
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PLUS_OR_MINUS="+"
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else
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exit 2
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fi
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#OLD_TIME="$(date)"
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#OLD_TIME_NANOSECONDS="$(date +%s.%N)"
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OLD_UNIXTIME="$(date +%s)"
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NEW_TIME="$(( $OLD_UNIXTIME $PLUS_OR_MINUS $DELAY ))"
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NEW_TIME_NANOSECONDS="$NEW_TIME.$NANOSECONDS"
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echo "$NEW_TIME_NANOSECONDS"
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## Testing the `date` syntax:
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## date --date @1396733199.112834496
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## date --date "@$NEW_TIME_NANOSECONDS"
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