#! /bin/sh
#
# SPDX-License-Identifier: BSD-2-Clause
#
# Copyright (c) 2018-2024 Gavin D. Howard and contributors.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this
#   list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright notice,
#   this list of conditions and the following disclaimer in the documentation
#   and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#

# This script uses some non-POSIX behavior, but since it's meant for bc
# maintainers only, I can accept that.

# Get an entry from the file. If an argument exists, it is an index. Get that
# line. Otherwise, get a random line.
getentry() {

	# Figure out if we get a specific or random line.
	if [ $# -gt 0 ]; then
		entnum="$1"
	else
		entnum=0
	fi

	# Get data from stdin and figure out how many lines there are.
	e=$(cat -)
	num=$(printf '%s\n' "$e" | wc -l)

	# Figure out what line we are going to get. Uses bc's own PRNG.
	if [ "$entnum" -eq 0 ]; then
		rand=$(printf 'irand(%s) + 1\n' "$num" | "$bcdir/bc")
	else
		rand="$entnum"
	fi

	# Get the line.
	ent=$(printf '%s\n' "$e" | tail -n +$rand | head -n 1)

	printf '%s\n' "$ent"
}

script="$0"
dir=$(dirname "$script")

. "$dir/functions.sh"

# Just print the usage and exit with an error. This can receive a message to
# print.
# @param 1  A message to print.
usage() {
	if [ $# -eq 1 ]; then
		printf '%s\n\n' "$1"
	fi
	printf 'usage: %s dir\n' "$script"
	exit 1
}

# Command-line processing.
if [ "$#" -lt 1 ]; then
	usage "Not enough arguments"
fi

d="$1"
shift
check_d_arg "$d"

bcdir="$dir/../bin"

# Figure out the correct input directory.
if [ "$d" = "bc" ]; then
	inputs="$dir/../tests/fuzzing/bc_inputs1"
	opts="-lq"
elif [ "$d" = "dc" ]; then
	inputs="$dir/../test/fuzzing/dc_inputs"
	opts="-x"
else
	err_exit "wrong type of executable" 1
fi

export ASAN_OPTIONS="abort_on_error=1:allocator_may_return_null=1"

entries=$(cat "$dir/radamsa.txt")

IFS=$'\n'

go=1

# Infinite loop.
while [ "$go" -ne 0 ]; do

	# If we are running bc, fuzz command-line arguments in BC_ENV_ARGS.
	if [ "$d" = "bc" ]; then

		entry=$(cat -- "$dir/radamsa.txt" | getentry)
		items=$(printf '%s\n' "$entry" | radamsa -n 10)

		printf '%s\n' "$items"

		for i in `seq 1 10`; do

			item=$(printf '%s\n' "$items" | getentry "$i")

			export BC_ENV_ARGS="$item"
			echo 'halt' | "$bcdir/$d"
			err=$?

			checkcrash "$d" "$err" "radamsa env args: \"$item\""
		done

	fi

	f=$(ls "$inputs" | getentry)
	l=$(cat "$inputs/$f" | wc -l)
	ll=$(printf '%s^2\n' "$l" | bc)

	# Fuzz on the AFL++ inputs.
	for i in $(seq 1 2); do
		data=$(cat "$inputs/$f" | radamsa -n 1)
		printf '%s\n' "$data" > "$dir/../.log_${d}_test.txt"
		printf '%s\n' "$data" | timeout -s SIGTERM 5 "$bcdir/$d" "$opts" > /dev/null
		err=$?
		checkcrash "$d" "$err" "radamsa stdin"
	done

done