/*
 * This file and its contents are supplied under the terms of the
 * Common Development and Distribution License ("CDDL"), version 1.0.
 * You may only use this file in accordance with the terms of version
 * 1.0 of the CDDL.
 *
 * A full copy of the text of the CDDL should have accompanied this
 * source.  A copy of the CDDL is also available via the Internet at
 * http://www.illumos.org/license/CDDL.
 */

/*
 * Copyright (c) 2015, Joyent, Inc.
 */

/*
 * Test getrandom(2)
 */

#include <sys/random.h>
#include <sys/mman.h>
#include <assert.h>
#include <errno.h>

int
main(void)
{
        int ret;
        void *addr;
        uint8_t buf[32];
        uint8_t bigbuf[4096];

        /* Go through flags values, start with invalid */
        ret = getrandom(buf, sizeof (buf), 42);
        assert(ret == -1);
        assert(errno == EINVAL);

        ret = getrandom(buf, sizeof (buf), 0);
        assert(ret >= 0);

        ret = getrandom(buf, sizeof (buf), GRND_NONBLOCK);
        assert(ret >= 0);

        ret = getrandom(buf, sizeof (buf), GRND_RANDOM);
        assert(ret >= 0);

        ret = getrandom(buf, sizeof (buf), GRND_RANDOM | GRND_NONBLOCK);
        assert(ret >= 0);

        ret = getrandom(buf, sizeof (buf), (GRND_RANDOM | GRND_NONBLOCK) << 1);
        assert(ret == -1);
        assert(errno == EINVAL);

        /* Bad buffer addresses, eg. EFAULT */
        ret = getrandom(NULL, sizeof (buf), 0);
        assert(ret == -1);
        assert(errno == EFAULT);

        ret = getrandom(NULL, sizeof (buf), GRND_RANDOM);
        assert(ret == -1);
        assert(errno == EFAULT);

        /* Jump through a hoop to know we'll always have a bad address */
        addr = mmap(NULL, 4096, PROT_READ, MAP_PRIVATE | MAP_ANON, -1, 0);
        assert(addr != MAP_FAILED);
        ret = munmap(addr, 4096);
        assert(ret == 0);
        ret = getrandom(addr, sizeof (buf), 0);
        assert(ret == -1);
        assert(errno == EFAULT);
        ret = getrandom(addr, sizeof (buf), GRND_RANDOM);
        assert(ret == -1);
        assert(errno == EFAULT);

        /* Verify that we get rounded down on a getrandom of /dev/random */
        ret = getrandom(bigbuf, sizeof (buf), GRND_RANDOM);
        assert(ret >= 0 && ret < sizeof (bigbuf));

        /* Do a few simple sets where we know we should get data */
        ret = getrandom(buf, sizeof (buf), 0);
        assert(ret == sizeof (buf));
        ret = getrandom(buf, sizeof (buf), GRND_RANDOM);
        assert(ret == sizeof (buf));

        return (0);
}