/*

 * Copyright(c) 2017 Tim Ruehsen

 *

 * 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

 * AUTHORS OR 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.

 */

#include <config.h>

#include <stdio.h>

#include <unistd.h>

#include <stdlib.h>

#include <stdint.h>

#include <string.h>

#include <fcntl.h>

#include <errno.h>

#include <sys/stat.h>

#include "fuzzer.h"

#ifdef TEST_RUN

#include <dirent.h>

#ifdef _WIN32

#  define SLASH '\\'

#else

#  define SLASH '/'

#endif

static int test_single_file(const char *fname)

{

	int fd, ret;

	struct stat st;

	uint8_t *data;

	ssize_t n;

	if ((fd = open(fname, O_RDONLY)) == -1) {

		fprintf(stderr, "Failed to open %s (%d)\n", fname, errno);

		return -1;

	}

	if (fstat(fd, &st) != 0) {

		fprintf(stderr, "Failed to stat %d (%d)\n", fd, errno);

		close(fd);

		return -1;

	}

	data = malloc(st.st_size);

	if ((n = read(fd, data, st.st_size)) == st.st_size) {

		printf("testing %llu bytes from '%s'\n", (unsigned long long) st.st_size, fname);

		fflush(stdout);

		LLVMFuzzerTestOneInput(data, st.st_size);

		fflush(stderr);

		ret = 0;

	} else {

		fprintf(stderr, "Failed to read %llu bytes from %s (%d), got %zd\n", (unsigned long long) st.st_size, fname, errno, n);

		ret = -1;

	}

	free(data);

	close(fd);

	return ret;

}

static int test_all_from(const char *dirname)

{

	DIR *dirp;

	struct dirent *dp;

	if ((dirp = opendir(dirname))) {

		while ((dp = readdir(dirp))) {

			if (*dp->d_name == '.') continue;

			char fname[strlen(dirname) + strlen(dp->d_name) + 2];

			snprintf(fname, sizeof(fname), "%s/%s", dirname, dp->d_name);

			if (test_single_file(fname) < 0)

				continue;

		}

		closedir(dirp);

		return 0;

	}

	return 1;

}

int main(int argc, char **argv)

{

	const char *target;

	size_t target_len;

	if ((target = strrchr(argv[0], SLASH)))

		target = strrchr(target, '/');

	else

		target = strrchr(argv[0], '/');

	target = target ? target + 1 : argv[0];

	if (strncmp(target, "lt-", 3) == 0)

		target += 3;

	target_len = strlen(target);

#ifdef _WIN32

	target_len -= 4; // ignore .exe

#endif

	if (argc > 1) { /* test a single file */

		test_single_file(argv[1]);

	} else { /* test the target directory */

		int rc;

		char corporadir[sizeof(SRCDIR) + 1 + target_len + 8];

		snprintf(corporadir, sizeof(corporadir), SRCDIR "/%.*s.in", (int) target_len, target);

		rc = test_all_from(corporadir);

		if (rc)

			fprintf(stderr, "Failed to find %s\n", corporadir);

		snprintf(corporadir, sizeof(corporadir), SRCDIR "/%.*s.repro", (int) target_len, target);

		if (test_all_from(corporadir) && rc)

			return 77;

	}

	return 0;

}

#else

#ifndef __AFL_LOOP

static int __AFL_LOOP(int n)

{

	static int first = 1;

	if (first) {

		first = 0;

		return 1;

	}

	return 0;

}

#endif

int main(int argc, char **argv)

{

	int ret;

	unsigned char buf[64 * 1024];

	while (__AFL_LOOP(10000)) { // only works with afl-clang-fast

		ret = fread(buf, 1, sizeof(buf), stdin);

		if (ret < 0)

			return 0;

		LLVMFuzzerTestOneInput(buf, ret);

	}

	return 0;

}

#endif /* TEST_RUN */