prosody
b9910a507250
util-src/crand.c

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util-src/crand.c @ 7830:b9910a507250

util.crand: Add comment describing purpose of module
author Kim Alvefur <zash@zash.se>
date Sun, 22 Jan 2017 09:32:33 +0100
parent 7829:1fb477d19fdd
child 7831:201d0df6cce9
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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 #include "lualib.h"
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23 #include "lauxlib.h"
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24
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25 #include <string.h>
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26 #include <errno.h>
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27
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28 #if defined(WITH_GETRANDOM)
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29 #include <unistd.h>
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30 #include <sys/syscall.h>
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31 #include <linux/random.h>
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32
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33 #ifndef SYS_getrandom
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34 #error getrandom() requires Linux 3.17 or later
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35 #endif
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36
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37 /* Was this not supposed to be a function? */
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38 int getrandom(void *buf, size_t len, int flags) {
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39 return syscall(SYS_getrandom, buf, len, flags);
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40 }
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41
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42 #elif defined(WITH_ARC4RANDOM)
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43 #include <stdlib.h>
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44 #elif defined(WITH_OPENSSL)
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45 #include <openssl/rand.h>
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46 #else
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47 #error util.crand compiled without a random source
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48 #endif
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49
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50 int Lrandom(lua_State *L) {
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51 int ret = 0;
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52 size_t len = (size_t)luaL_checkinteger(L, 1);
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53 void *buf = lua_newuserdata(L, len);
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54
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55 #if defined(WITH_GETRANDOM)
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56 ret = getrandom(buf, len, 0);
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57
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58 if(ret < 0) {
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59 lua_pushstring(L, strerror(errno));
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60 return lua_error(L);
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61 }
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62
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63 #elif defined(WITH_ARC4RANDOM)
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64 arc4random_buf(buf, len);
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65 ret = len;
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66 #elif defined(WITH_OPENSSL)
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67 ret = RAND_bytes(buf, len);
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68
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69 if(ret == 1) {
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70 ret = len;
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71 } else {
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72 lua_pushstring(L, "RAND_bytes() failed");
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73 return lua_error(L);
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74 }
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76 #endif
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77
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78 lua_pushlstring(L, buf, ret);
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79 return 1;
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80 }
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81
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82 int luaopen_util_crand(lua_State *L) {
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83 #if (LUA_VERSION_NUM > 501)
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84 luaL_checkversion(L);
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85 #endif
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86 lua_newtable(L);
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87 lua_pushcfunction(L, Lrandom);
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88 lua_setfield(L, -2, "bytes");
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89
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90 #if defined(WITH_GETRANDOM)
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91 lua_pushstring(L, "Linux");
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92 #elif defined(WITH_ARC4RANDOM)
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93 lua_pushstring(L, "arc4random()");
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94 #elif defined(WITH_OPENSSL)
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95 lua_pushstring(L, "OpenSSL");
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96 #endif
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97 lua_setfield(L, -2, "_source");
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98
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99 #if defined(WITH_OPENSSL) && defined(_WIN32)
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100 /* Do we need to seed this on Windows? */
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101 #endif
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103 return 1;
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104 }
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105