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1 /* Copyright libuv contributors. All rights reserved.
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2 *
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3 * Permission is hereby granted, free of charge, to any person obtaining a copy
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4 * of this software and associated documentation files (the "Software"), to
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5 * deal in the Software without restriction, including without limitation the
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6 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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7 * sell copies of the Software, and to permit persons to whom the Software is
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8 * furnished to do so, subject to the following conditions:
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9 *
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10 * The above copyright notice and this permission notice shall be included in
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11 * all copies or substantial portions of the Software.
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12 *
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13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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18 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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19 * IN THE SOFTWARE.
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20 */
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21
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22 #include "uv.h"
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23 #include "uv-common.h"
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24
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25 #ifdef _WIN32
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26 # include "win/internal.h"
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27 #else
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28 # include "unix/internal.h"
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29 #endif
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30
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31 static int uv__random(void* buf, size_t buflen) {
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32 int rc;
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33
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34 #if defined(__PASE__)
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35 rc = uv__random_readpath("/dev/urandom", buf, buflen);
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36 #elif defined(_AIX) || defined(__QNX__)
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37 rc = uv__random_readpath("/dev/random", buf, buflen);
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38 #elif defined(__APPLE__) || defined(__OpenBSD__) || \
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39 (defined(__ANDROID_API__) && __ANDROID_API__ >= 28)
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40 rc = uv__random_getentropy(buf, buflen);
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41 if (rc == UV_ENOSYS)
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42 rc = uv__random_devurandom(buf, buflen);
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43 #elif defined(__NetBSD__)
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44 rc = uv__random_sysctl(buf, buflen);
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45 #elif defined(__FreeBSD__) || defined(__linux__)
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46 rc = uv__random_getrandom(buf, buflen);
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47 if (rc == UV_ENOSYS)
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48 rc = uv__random_devurandom(buf, buflen);
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49 # if defined(__linux__)
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50 switch (rc) {
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51 case UV_EACCES:
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52 case UV_EIO:
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53 case UV_ELOOP:
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54 case UV_EMFILE:
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55 case UV_ENFILE:
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56 case UV_ENOENT:
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57 case UV_EPERM:
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58 rc = uv__random_sysctl(buf, buflen);
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59 break;
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60 }
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61 # endif
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62 #elif defined(_WIN32)
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63 uv__once_init();
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64 rc = uv__random_rtlgenrandom(buf, buflen);
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65 #else
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66 rc = uv__random_devurandom(buf, buflen);
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67 #endif
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68
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69 return rc;
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70 }
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71
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72
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73 static void uv__random_work(struct uv__work* w) {
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74 uv_random_t* req;
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75
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76 req = container_of(w, uv_random_t, work_req);
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77 req->status = uv__random(req->buf, req->buflen);
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78 }
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79
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80
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81 static void uv__random_done(struct uv__work* w, int status) {
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82 uv_random_t* req;
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83
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84 req = container_of(w, uv_random_t, work_req);
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85 uv__req_unregister(req->loop);
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86
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87 if (status == 0)
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88 status = req->status;
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89
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90 req->cb(req, status, req->buf, req->buflen);
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91 }
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92
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93
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94 int uv_random(uv_loop_t* loop,
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95 uv_random_t* req,
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96 void *buf,
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97 size_t buflen,
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98 unsigned flags,
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99 uv_random_cb cb) {
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100 if (buflen > 0x7FFFFFFFu)
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101 return UV_E2BIG;
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102
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103 if (flags != 0)
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104 return UV_EINVAL;
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105
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106 if (cb == NULL)
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107 return uv__random(buf, buflen);
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108
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109 uv__req_init(loop, req, UV_RANDOM);
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110 req->loop = loop;
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111 req->status = 0;
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112 req->cb = cb;
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113 req->buf = buf;
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114 req->buflen = buflen;
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115
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116 uv__work_submit(loop,
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117 &req->work_req,
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118 UV__WORK_CPU,
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119 uv__random_work,
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120 uv__random_done);
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121
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122 return 0;
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123 }
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