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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) || defined(__QNX__)
  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;
}