94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
/* $NetBSD: rumpuser_random.c,v 1.4 2014/11/04 19:05:17 pooka Exp $ */
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/*
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* Copyright (c) 2014 Justin Cormack. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "rumpuser_port.h"
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#if !defined(lint)
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__RCSID("$NetBSD: rumpuser_random.c,v 1.4 2014/11/04 19:05:17 pooka Exp $");
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#endif /* !lint */
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#include <sys/types.h>
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <rump/rumpuser.h>
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#include "rumpuser_int.h"
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static const size_t random_maxread = 32;
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#ifdef HAVE_ARC4RANDOM_BUF
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int
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rumpuser__random_init(void)
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{
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return 0;
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}
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#else
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static const char *random_device = "/dev/urandom";
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static int random_fd = -1;
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int
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rumpuser__random_init(void)
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{
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random_fd = open(random_device, O_RDONLY);
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if (random_fd < 0) {
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fprintf(stderr, "random init open failed\n");
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return errno;
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}
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return 0;
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}
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#endif
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int
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rumpuser_getrandom(void *buf, size_t buflen, int flags, size_t *retp)
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{
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#ifndef HAVE_ARC4RANDOM_BUF
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ssize_t rv;
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rv = read(random_fd, buf, buflen > random_maxread ? random_maxread : buflen);
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if (rv < 0) {
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ET(errno);
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}
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*retp = rv;
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#else
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buflen = buflen > random_maxread ? random_maxread : buflen;
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arc4random_buf(buf, buflen);
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*retp = buflen;
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#endif
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return 0;
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}
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