1/*
2 * Copyright (c) 2010 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Portions Copyright (c) 2010 Apple Inc. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <config.h>
37
38#include <sys/types.h>
39#include <fcntl.h>
40#include <errno.h>
41#include <unistd.h>
42
43#include <krb5-types.h>
44
45#include "roken.h"
46
47#include <CommonCrypto/CommonCryptor.h>
48#include "CCDGlue.h"
49
50static int
51_hc_unix_device_fd(int flags, const char **fn)
52{
53    static const char *rnd_devices[] = {
54	"/dev/urandom",
55	"/dev/random",
56	"/dev/srandom",
57	"/dev/arandom",
58	NULL
59    };
60    const char **p;
61
62    for(p = rnd_devices; *p; p++) {
63	int fd = open(*p, flags | O_NDELAY);
64	if(fd >= 0) {
65	    if (fn)
66		*fn = *p;
67	    rk_cloexec(fd);
68	    return fd;
69	}
70    }
71    return -1;
72}
73
74int
75CCRandomCopyBytes(CCRandomRef source, void *data, size_t size)
76{
77    uint8_t *outdata = data;
78    ssize_t count;
79    int fd;
80
81    if (size == 0)
82	return 0;
83
84    fd = _hc_unix_device_fd(O_RDONLY, NULL);
85    if (fd < 0)
86	return EINVAL;
87
88    while (size > 0) {
89	count = read(fd, outdata, size);
90	if (count < 0 && errno == EINTR)
91	    continue;
92	else if (count <= 0) {
93	    close(fd);
94	    return EINVAL;
95	}
96	outdata += count;
97	size -= count;
98    }
99    close(fd);
100
101    return 1;
102}
103