/**

 * 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 <unistd.h>

#include <stdbool.h>

#include <seccomp.h>

#include "util.h"

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

{

	int rc;

	struct util_options opts;

	scmp_filter_ctx ctx = NULL;

	rc = util_getopt(argc, argv, &opts);

	if (rc < 0)

		goto out;

	ctx = seccomp_init(SCMP_ACT_KILL);

	if (ctx == NULL)

		return ENOMEM;

	/* the syscall and argument numbers are all fake to make the test

	 * simpler */

	rc = seccomp_rule_add_exact(ctx, SCMP_ACT_ALLOW, 1008, 1,

				    SCMP_A0(SCMP_CMP_GE, 1));

	if (rc != 0)

		goto out;

	/* db_chain_lt() path #1 - due to "A1" > "A0" */

	rc = seccomp_rule_add_exact(ctx, SCMP_ACT_ALLOW, 1008, 1,

				    SCMP_A1(SCMP_CMP_GE, 2));

	if (rc != 0)

		goto out;

	/* db_chain_lt() path #2 - due to "GT" > "GE" */

	rc = seccomp_rule_add_exact(ctx, SCMP_ACT_ALLOW, 1008, 1,

				    SCMP_A0(SCMP_CMP_GT, 3));

	if (rc != 0)

		goto out;

	/* db_chain_lt() path #3 - due to the second mask (0xff) being greater

	 * than the first (0xf) */

	rc = seccomp_rule_add_exact(ctx, SCMP_ACT_ALLOW, 1008, 1,

				    SCMP_A2(SCMP_CMP_MASKED_EQ, 0xf, 4));

	if (rc != 0)

		goto out;

	rc = seccomp_rule_add_exact(ctx, SCMP_ACT_ALLOW, 1008, 1,

				    SCMP_A2(SCMP_CMP_MASKED_EQ, 0xff, 5));

	if (rc != 0)

		goto out;

	/* db_chain_lt() path #4 - due to datum (6) > previous datum (5) */

	rc = seccomp_rule_add_exact(ctx, SCMP_ACT_ALLOW, 1008, 1,

				    SCMP_A2(SCMP_CMP_MASKED_EQ, 0xff, 6));

	if (rc != 0)

		goto out;

	/* attempt to hit some of the lvl_prv and lvl_nxt code in db.c */

	rc = seccomp_rule_add_exact(ctx, SCMP_ACT_ALLOW, 1008, 5,

				    SCMP_A0(SCMP_CMP_NE, 7),

				    SCMP_A1(SCMP_CMP_LT, 8),

				    SCMP_A2(SCMP_CMP_EQ, 9),

				    SCMP_A3(SCMP_CMP_GE, 10),

				    SCMP_A4(SCMP_CMP_GT, 11),

				    SCMP_A5(SCMP_CMP_MASKED_EQ, 0xffff, 12));

	if (rc != 0)

		goto out;

	rc = seccomp_rule_add_exact(ctx, SCMP_ACT_ALLOW, 1008, 5,

				    SCMP_A0(SCMP_CMP_NE, 7),

				    SCMP_A1(SCMP_CMP_LT, 8),

				    SCMP_A2(SCMP_CMP_EQ, 9),

				    SCMP_A3(SCMP_CMP_GE, 10),

				    SCMP_A4(SCMP_CMP_GT, 11),

				    SCMP_A5(SCMP_CMP_MASKED_EQ, 0xffff, 13));

	if (rc != 0)

		goto out;

	rc = util_filter_output(&opts, ctx);

	if (rc)

		goto out;

out:

	seccomp_release(ctx);

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

}