server/random-stream

#!/bin/sh

# Copyright 2015-2022 Rivoreo

# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:

# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE
# FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
# CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.


set -f
sockopt keepalive=1
echo "UX:Ready"
while read -r line; do case "$line" in
	ping)
		echo "UX:Pong"
		;;
	binary)
		echo "UX:Will send INFINITY amount of random binary data, type 'yes' confirm"
		if read -r line && [ "$line" = yes ]; then
			echo "UX:Confirmed"
			echo begin
			exec cat /dev/urandom
		fi
		echo "UX:Operation canceled"
		;;
	"binary "*|"ascii "*)
		if a="`printf '%s\\n' \"$line\" | sed -En 's/(binary|ascii) +([0-9]+) ?(Ki)?\$/\\2 \\3/p'`" && [ -n "$a" ] && set -- $a && [ "$1" -gt 0 ]; then
			[ $# = 2 ] && [ "$2" = Ki ] && bs=1024 || bs=1
			printf "UX:Will send %s %sB of random %s data, type 'yes' confirm\\n" "$1" "$2" "${line%% *}"
			if read -r line && [ "$line" = yes ]; then
				echo "UX:Confirmed"
				echo begin
				exec dd if=/dev/urandom bs=$bs "count=$1" 2> /dev/null
			fi
			echo "UX:Operation canceled"
		else
			echo "UX:Bad command"
		fi
		;;
	*)
		echo "UX:Command not recognized"
		exit 1
		;;
esac done