prosody
6c5e4f24b51e
util-src/crand.c

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util-src/crand.c @ 7932:6c5e4f24b51e

util.crand: Move comment block
author Kim Alvefur <zash@zash.se>
date Wed, 01 Mar 2017 22:39:01 +0100
parent 7931:b619b85e01aa
child 7933:c91ec7689424
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* Prosody IM
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2 -- Copyright (C) 2008-2017 Matthew Wild
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3 -- Copyright (C) 2008-2017 Waqas Hussain
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4 -- Copyright (C) 2016-2017 Kim Alvefur
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5 --
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6 -- This project is MIT/X11 licensed. Please see the
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7 -- COPYING file in the source package for more information.
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8 --
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9 */
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10
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11 /*
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12 * crand.c
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13 * C PRNG interface
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14 *
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15 * The purpose of this module is to provide access to a PRNG in
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16 * environments without /dev/urandom
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17 *
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18 * Caution! This has not been extensively tested.
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19 *
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20 */
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21
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22 #define _DEFAULT_SOURCE
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23
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24 #include "lualib.h"
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25 #include "lauxlib.h"
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26
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27 #include <string.h>
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28 #include <errno.h>
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30 #if defined(WITH_GETRANDOM)
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31 #include <unistd.h>
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32 #include <sys/syscall.h>
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33 #include <linux/random.h>
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34
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35 #ifndef SYS_getrandom
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36 #error getrandom() requires Linux 3.17 or later
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37 #endif
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38
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39 int getrandom(void *buf, size_t len, int flags) {
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40 return syscall(SYS_getrandom, buf, len, flags);
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41 }
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42
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43 #elif defined(WITH_ARC4RANDOM)
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44 #include <stdlib.h>
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45 #elif defined(WITH_OPENSSL)
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46 #include <openssl/rand.h>
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47 #else
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48 #error util.crand compiled without a random source
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49 #endif
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50
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51 int Lrandom(lua_State *L) {
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52 int ret = 0;
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53 size_t len = (size_t)luaL_checkinteger(L, 1);
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54 void *buf = lua_newuserdata(L, len);
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55
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56 #if defined(WITH_GETRANDOM)
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57 /*
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58 * This acts like a read from /dev/urandom with the exception that it
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59 * *does* block if the entropy pool is not yet initialized.
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60 */
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61 ret = getrandom(buf, len, 0);
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62
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63 if(ret < 0) {
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64 lua_pushstring(L, strerror(errno));
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65 return lua_error(L);
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66 }
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67
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68 #elif defined(WITH_ARC4RANDOM)
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69 arc4random_buf(buf, len);
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70 ret = len;
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71 #elif defined(WITH_OPENSSL)
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72 if(!RAND_status()) {
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73 lua_pushliteral(L, "OpenSSL PRNG not seeded");
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74 return lua_error(L);
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75 }
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76
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77 ret = RAND_bytes(buf, len);
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79 if(ret == 1) {
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80 ret = len;
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81 } else {
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82 /* TODO ERR_get_error() */
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83 lua_pushstring(L, "RAND_bytes() failed");
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84 return lua_error(L);
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85 }
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86
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87 #endif
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88
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89 lua_pushlstring(L, buf, ret);
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90 return 1;
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91 }
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93 int luaopen_util_crand(lua_State *L) {
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94 #if (LUA_VERSION_NUM > 501)
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95 luaL_checkversion(L);
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96 #endif
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97
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98 lua_newtable(L);
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99 lua_pushcfunction(L, Lrandom);
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100 lua_setfield(L, -2, "bytes");
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102 #if defined(WITH_GETRANDOM)
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103 lua_pushstring(L, "Linux");
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104 #elif defined(WITH_ARC4RANDOM)
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105 lua_pushstring(L, "arc4random()");
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106 #elif defined(WITH_OPENSSL)
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107 lua_pushstring(L, "OpenSSL");
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108 #endif
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109 lua_setfield(L, -2, "_source");
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110
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111 return 1;
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112 }
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113