/**

 * Seccomp Library test program

 *

 * Copyright (c) 2018 Oracle and/or its affiliates.  All rights reserved.

 * Author: Tom Hromatka <tom.hromatka@oracle.com>

 */

/*

 * This library is free software; you can redistribute it and/or modify it

 * under the terms of version 2.1 of the GNU Lesser General Public License as

 * published by the Free Software Foundation.

 *

 * This library is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License

 * for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with this library; if not, see <http://www.gnu.org/licenses>.

 */

#include <errno.h>

#include <fcntl.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <seccomp.h>

#include "util.h"

#define DEFAULT_ACTION_ERRNO	100

#define DEFAULT_ACTION		SCMP_ACT_ERRNO(DEFAULT_ACTION_ERRNO)

struct size_and_rc {

	int size;

	int expected_rc;

};

static const struct size_and_rc test_cases[] = {

	{1, 1},

	{10, 10},

	{50, 50},

	{100, -DEFAULT_ACTION_ERRNO},

	{200, -5},

	{256, -5},

	{257, -6},

	{400, -6},

	{800, -7},

	{1600, -8},

	{3200, -9},

	{4095, -9},

	{4096, -9},

	{4097, -10},

	{8000, -10},

	{8192, -10},

	{16383, -11},

	{16384, -11},

	{16385, -12},

	{35000, -12},

};

static int do_read(int sz, int expected_rc)

{

	char *buf = NULL;

	int rc = -1000, zero_fd = -1;

	zero_fd = open("/dev/zero", O_RDONLY);

	if (zero_fd <= 0)

		goto error;

	buf = malloc(sz);

	if (buf == NULL)

		goto error;

	rc = read(zero_fd, buf, sz);

	if(rc < 0) {

		if (expected_rc == -errno)

			rc = 0;

	} else {

		if (rc == expected_rc)

			rc = 0;

	}

error:

	if (zero_fd >= 0)

		close(zero_fd);

	if (buf)

		free(buf);

	return rc;

}

int main(int argc, char *argv[])

{

	int rc, i;

	scmp_filter_ctx ctx = NULL;

	ctx = seccomp_init(DEFAULT_ACTION);

	if (ctx == NULL)

		return ENOMEM;

	rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(read), 1,

			      SCMP_A2(SCMP_CMP_LE, 64));

	if (rc != 0)

		goto out;

	rc = seccomp_rule_add(ctx, SCMP_ACT_ERRNO(5), SCMP_SYS(read), 1,

			      SCMP_A2(SCMP_CMP_GT, 128));

	if (rc != 0)

		goto out;

	rc = seccomp_rule_add(ctx, SCMP_ACT_ERRNO(6), SCMP_SYS(read), 1,

			      SCMP_A2(SCMP_CMP_GT, 256));

	if (rc != 0)

		goto out;

	rc = seccomp_rule_add(ctx, SCMP_ACT_ERRNO(7), SCMP_SYS(read), 1,

			      SCMP_A2(SCMP_CMP_GT, 512));

	if (rc != 0)

		goto out;

	rc = seccomp_rule_add(ctx, SCMP_ACT_ERRNO(8), SCMP_SYS(read), 1,

			      SCMP_A2(SCMP_CMP_GT, 1024));

	if (rc != 0)

		goto out;

	rc = seccomp_rule_add(ctx, SCMP_ACT_ERRNO(9), SCMP_SYS(read), 1,

			      SCMP_A2(SCMP_CMP_GT, 2048));

	if (rc != 0)

		goto out;

	rc = seccomp_rule_add(ctx, SCMP_ACT_ERRNO(10), SCMP_SYS(read), 1,

			      SCMP_A2(SCMP_CMP_GT, 4096));

	if (rc != 0)

		goto out;

	rc = seccomp_rule_add(ctx, SCMP_ACT_ERRNO(11), SCMP_SYS(read), 1,

			      SCMP_A2(SCMP_CMP_GT, 8192));

	if (rc != 0)

		goto out;

	rc = seccomp_rule_add(ctx, SCMP_ACT_ERRNO(12), SCMP_SYS(read), 1,

			      SCMP_A2(SCMP_CMP_GT, 16384));

	if (rc != 0)

		goto out;

	rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(close), 0);

	if (rc != 0)

		goto out;

	rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(rt_sigreturn), 0);

	if (rc != 0)

		goto out;

	rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(exit_group), 0);

	if (rc != 0)

		goto out;

	rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(exit), 0);

	if (rc != 0)

		goto out;

	rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(open), 0);

	if (rc != 0)

		goto out;

	rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(openat), 0);

	if (rc != 0)

		goto out;

	rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(stat), 0);

	if (rc != 0)

		goto out;

	rc = seccomp_load(ctx);

	if (rc != 0)

		goto out;

	for (i = 0; i < sizeof(test_cases) / sizeof(test_cases[0]); i++) {

		rc = do_read(test_cases[i].size,

			     test_cases[i].expected_rc);

		if (rc < 0)

			goto out;

	}

	rc = 160;

out:

	seccomp_release(ctx);

	return (rc < 0 ? -rc : rc);

}