prosody
56552733742e
util-src/crand.c

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util-src/crand.c @ 7824:56552733742e

util.crand: Let Lua handle allocation, freeing and error handling for buffer
author Kim Alvefur <zash@zash.se>
date Fri, 20 Jan 2017 11:52:46 +0100
parent 7823:9b66ada1487c
child 7825:1dfa5847d49e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
7187
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1 /* Prosody IM
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2 -- Copyright (C) 2008-2016 Matthew Wild
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3 -- Copyright (C) 2008-2016 Waqas Hussain
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4 -- Copyright (C) 2016 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
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16 #include "lualib.h"
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17 #include "lauxlib.h"
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18
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19 #include <string.h>
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20 #include <errno.h>
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21
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22 #if defined(WITH_GETRANDOM)
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23 #include <unistd.h>
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24 #include <sys/syscall.h>
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25 #include <linux/random.h>
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26
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27 #ifndef SYS_getrandom
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28 #error getrandom() requires Linux 3.17 or later
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29 #endif
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30
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31 /* Was this not supposed to be a function? */
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32 int getrandom(void *buf, size_t len, int flags) {
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33 return syscall(SYS_getrandom, buf, len, flags);
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34 }
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35
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36 #elif defined(WITH_ARC4RANDOM)
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37 #include <stdlib.h>
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38 #elif defined(WITH_OPENSSL)
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39 #include <openssl/rand.h>
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40 #else
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41 #error util.crand compiled without a random source
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42 #endif
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43
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44 int Lrandom(lua_State *L) {
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45 int ret = 0;
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46 size_t len = (size_t)luaL_checkinteger(L, 1);
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47 void *buf = lua_newuserdata(L, len);
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48
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49 #if defined(WITH_GETRANDOM)
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50 ret = getrandom(buf, len, 0);
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51
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52 if(ret < 0) {
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53 lua_pushnil(L);
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54 lua_pushstring(L, strerror(errno));
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55 lua_pushinteger(L, errno);
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56 return 3;
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57 }
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58
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59 #elif defined(WITH_ARC4RANDOM)
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60 arc4random_buf(buf, len);
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61 ret = len;
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62 #elif defined(WITH_OPENSSL)
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63 ret = RAND_bytes(buf, len);
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64
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65 if(ret == 1) {
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66 ret = len;
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67 } else {
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68 lua_pushnil(L);
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69 lua_pushstring(L, "failed");
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70 /* lua_pushinteger(L, ERR_get_error()); */
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71 return 2;
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72 }
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73
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74 #endif
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75
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76 lua_pushlstring(L, buf, ret);
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77 return 1;
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78 }
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79
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80 #ifdef ENABLE_SEEDING
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81 int Lseed(lua_State *L) {
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82 size_t len;
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83 const char *seed = lua_tolstring(L, 1, &len);
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84
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85 #if defined(WITH_OPENSSL)
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86 RAND_add(seed, len, len);
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87 return 0;
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88 #else
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89 lua_pushnil(L);
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90 lua_pushliteral(L, "not-supported");
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91 return 2;
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92 #endif
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93 }
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94 #endif
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95
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96 int luaopen_util_crand(lua_State *L) {
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97 #if (LUA_VERSION_NUM > 501)
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98 luaL_checkversion(L);
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99 #endif
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100 lua_newtable(L);
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101 lua_pushcfunction(L, Lrandom);
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102 lua_setfield(L, -2, "bytes");
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103 #ifdef ENABLE_SEEDING
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104 lua_pushcfunction(L, Lseed);
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105 lua_setfield(L, -2, "seed");
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106 #endif
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107
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108 #if defined(WITH_GETRANDOM)
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109 lua_pushstring(L, "Linux");
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110 #elif defined(WITH_ARC4RANDOM)
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111 lua_pushstring(L, "arc4random()");
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112 #elif defined(WITH_OPENSSL)
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113 lua_pushstring(L, "OpenSSL");
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114 #endif
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115 lua_setfield(L, -2, "_source");
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116
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117 #if defined(WITH_OPENSSL) && defined(_WIN32)
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118 /* Do we need to seed this on Windows? */
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119 #endif
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120
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121 return 1;
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122 }
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123