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/*-
* Copyright (c) 2013 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Pawel Jakub Dawidek under sponsorship from
* the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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 AUTHORS 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 AUTHORS 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <nv.h>
#include "libcapsicum.h"
#include "libcapsicum_random.h"
#define MAXSIZE (1024 * 1024)
int
cap_random_buf(cap_channel_t *chan, void *buf, size_t nbytes)
{
nvlist_t *nvl;
const void *randbuf;
uint8_t *ptr;
size_t left, randbufsize;
left = nbytes;
ptr = buf;
while (left > 0) {
nvl = nvlist_create(0);
nvlist_add_string(nvl, "cmd", "generate");
nvlist_add_number(nvl, "size",
(uint64_t)(left > MAXSIZE ? MAXSIZE : left));
nvl = cap_xfer_nvlist(chan, nvl, 0);
if (nvl == NULL)
return (-1);
if (nvlist_get_number(nvl, "error") != 0) {
errno = (int)nvlist_get_number(nvl, "error");
nvlist_destroy(nvl);
return (-1);
}
randbuf = nvlist_get_binary(nvl, "data", &randbufsize);
memcpy(ptr, randbuf, randbufsize);
nvlist_destroy(nvl);
ptr += randbufsize;
assert(left >= randbufsize);
left -= randbufsize;
}
return (0);
}
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