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lib/libcasper/services/cap_random/cap_random.c
- This file was added.
/*- | |||||
* 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 <sys/nv.h> | |||||
#include <assert.h> | |||||
#include <errno.h> | |||||
#include <stdio.h> | |||||
#include <stdlib.h> | |||||
#include <string.h> | |||||
#include <libcasper.h> | |||||
#include <libcasper_service.h> | |||||
#include "cap_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); | |||||
} | |||||
/* | |||||
* Service functions. | |||||
*/ | |||||
static int | |||||
random_command(const char *cmd, const nvlist_t *limits __unused, | |||||
nvlist_t *nvlin, nvlist_t *nvlout) | |||||
{ | |||||
void *data; | |||||
size_t size; | |||||
if (strcmp(cmd, "generate") != 0) | |||||
return (EINVAL); | |||||
if (!nvlist_exists_number(nvlin, "size")) | |||||
return (EINVAL); | |||||
size = (size_t)nvlist_get_number(nvlin, "size"); | |||||
if (size == 0 || size > MAXSIZE) | |||||
return (EINVAL); | |||||
data = malloc(size); | |||||
if (data == NULL) | |||||
return (ENOMEM); | |||||
arc4random_buf(data, size); | |||||
nvlist_move_binary(nvlout, "data", data, size); | |||||
return (0); | |||||
} | |||||
CREATE_SERVICE("system.random", NULL, random_command); |