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/* Copyright libuv contributors. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "uv.h"
#include "uv-common.h"
#ifdef _WIN32
# include "win/internal.h"
#else
# include "unix/internal.h"
#endif
static int uv__random(void* buf, size_t buflen) {
int rc;
#if defined(__PASE__)
rc = uv__random_readpath("/dev/urandom", buf, buflen);
#elif defined(_AIX)
rc = uv__random_readpath("/dev/random", buf, buflen);
#elif defined(__APPLE__) || defined(__OpenBSD__) || \
(defined(__ANDROID_API__) && __ANDROID_API__ >= 28)
rc = uv__random_getentropy(buf, buflen);
if (rc == UV_ENOSYS)
rc = uv__random_devurandom(buf, buflen);
#elif defined(__NetBSD__)
rc = uv__random_sysctl(buf, buflen);
#elif defined(__FreeBSD__) || defined(__linux__)
rc = uv__random_getrandom(buf, buflen);
if (rc == UV_ENOSYS)
rc = uv__random_devurandom(buf, buflen);
# if defined(__linux__)
switch (rc) {
case UV_EACCES:
case UV_EIO:
case UV_ELOOP:
case UV_EMFILE:
case UV_ENFILE:
case UV_ENOENT:
case UV_EPERM:
rc = uv__random_sysctl(buf, buflen);
break;
}
# endif
#elif defined(_WIN32)
uv__once_init();
rc = uv__random_rtlgenrandom(buf, buflen);
#else
rc = uv__random_devurandom(buf, buflen);
#endif
return rc;
}
static void uv__random_work(struct uv__work* w) {
uv_random_t* req;
req = container_of(w, uv_random_t, work_req);
req->status = uv__random(req->buf, req->buflen);
}
static void uv__random_done(struct uv__work* w, int status) {
uv_random_t* req;
req = container_of(w, uv_random_t, work_req);
uv__req_unregister(req->loop, req);
if (status == 0)
status = req->status;
req->cb(req, status, req->buf, req->buflen);
}
int uv_random(uv_loop_t* loop,
uv_random_t* req,
void *buf,
size_t buflen,
unsigned flags,
uv_random_cb cb) {
if (buflen > 0x7FFFFFFFu)
return UV_E2BIG;
if (flags != 0)
return UV_EINVAL;
if (cb == NULL)
return uv__random(buf, buflen);
uv__req_init(loop, req, UV_RANDOM);
req->loop = loop;
req->status = 0;
req->cb = cb;
req->buf = buf;
req->buflen = buflen;
uv__work_submit(loop,
&req->work_req,
UV__WORK_CPU,
uv__random_work,
uv__random_done);
return 0;
}
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