|
160
|
1 /* Copyright libuv contributors. All rights reserved.
|
|
|
2 *
|
|
|
3 * Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
|
4 * of this software and associated documentation files (the "Software"), to
|
|
|
5 * deal in the Software without restriction, including without limitation the
|
|
|
6 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
|
|
|
7 * sell copies of the Software, and to permit persons to whom the Software is
|
|
|
8 * furnished to do so, subject to the following conditions:
|
|
|
9 *
|
|
|
10 * The above copyright notice and this permission notice shall be included in
|
|
|
11 * all copies or substantial portions of the Software.
|
|
|
12 *
|
|
|
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
|
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
|
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
|
16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
|
17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
|
18 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
|
|
|
19 * IN THE SOFTWARE.
|
|
|
20 */
|
|
|
21
|
|
|
22 #include "uv.h"
|
|
|
23 #include "internal.h"
|
|
|
24
|
|
|
25 #include <stddef.h>
|
|
|
26 #include <dlfcn.h>
|
|
|
27
|
|
|
28 typedef int (*uv__getentropy_cb)(void *, size_t);
|
|
|
29
|
|
|
30 static uv__getentropy_cb uv__getentropy;
|
|
|
31 static uv_once_t once = UV_ONCE_INIT;
|
|
|
32
|
|
|
33
|
|
|
34 static void uv__random_getentropy_init(void) {
|
|
|
35 uv__getentropy = (uv__getentropy_cb) dlsym(RTLD_DEFAULT, "getentropy");
|
|
|
36 }
|
|
|
37
|
|
|
38
|
|
|
39 int uv__random_getentropy(void* buf, size_t buflen) {
|
|
|
40 size_t pos;
|
|
|
41 size_t stride;
|
|
|
42
|
|
|
43 uv_once(&once, uv__random_getentropy_init);
|
|
|
44
|
|
|
45 if (uv__getentropy == NULL)
|
|
|
46 return UV_ENOSYS;
|
|
|
47
|
|
|
48 /* getentropy() returns an error for requests > 256 bytes. */
|
|
|
49 for (pos = 0, stride = 256; pos + stride < buflen; pos += stride)
|
|
|
50 if (uv__getentropy((char *) buf + pos, stride))
|
|
|
51 return UV__ERR(errno);
|
|
|
52
|
|
|
53 if (uv__getentropy((char *) buf + pos, buflen - pos))
|
|
|
54 return UV__ERR(errno);
|
|
|
55
|
|
|
56 return 0;
|
|
|
57 }
|
