prosody
fdb2e0568cf8
util-src/strbitop.c

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util-src/strbitop.c @ 13587:fdb2e0568cf8

mod_authz_internal: Make 'prosody:guest' default role for all unknown JIDs This fixes an issue where e.g. remote users or even other users on the server were unable to list MUC rooms. We want to define a permission to list MUC rooms, but we want it to be available to everyone by default (the traditional behaviour). prosody:guest is the lowest role we have. I ran a quick check and it isn't really used for anything right now that would be concerning. It was originally designed for anonymous logins. I think it's safe to treat remote JIDs as equivalent, since we have no trust relationship with anonymous users either.
author Matthew Wild <mwild1@gmail.com>
date Tue, 07 Jan 2025 14:41:32 +0000
parent 13429:6cdc6923d65a
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rev   line source
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1 /*
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2 * This project is MIT licensed. Please see the
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3 * COPYING file in the source package for more information.
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4 *
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5 * Copyright (C) 2016 Kim Alvefur
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6 */
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7
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8 #include <lua.h>
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9 #include <lauxlib.h>
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10
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11 #include <sys/param.h>
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12 #include <limits.h>
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13
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14 /* TODO Deduplicate code somehow */
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15
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16 static int strop_and(lua_State *L) {
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17 luaL_Buffer buf;
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18 size_t a, b, i;
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19 const char *str_a = luaL_checklstring(L, 1, &a);
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20 const char *str_b = luaL_checklstring(L, 2, &b);
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21
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22 luaL_buffinit(L, &buf);
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23
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24 if(a == 0 || b == 0) {
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25 lua_settop(L, 1);
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26 return 1;
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27 }
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28
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29 for(i = 0; i < a; i++) {
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30 luaL_addchar(&buf, str_a[i] & str_b[i % b]);
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31 }
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32
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33 luaL_pushresult(&buf);
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34 return 1;
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35 }
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36
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37 static int strop_or(lua_State *L) {
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38 luaL_Buffer buf;
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39 size_t a, b, i;
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40 const char *str_a = luaL_checklstring(L, 1, &a);
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41 const char *str_b = luaL_checklstring(L, 2, &b);
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42
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43 luaL_buffinit(L, &buf);
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44
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45 if(a == 0 || b == 0) {
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46 lua_settop(L, 1);
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47 return 1;
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48 }
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49
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50 for(i = 0; i < a; i++) {
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51 luaL_addchar(&buf, str_a[i] | str_b[i % b]);
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52 }
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53
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54 luaL_pushresult(&buf);
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55 return 1;
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56 }
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57
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58 static int strop_xor(lua_State *L) {
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59 luaL_Buffer buf;
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60 size_t a, b, i;
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61 const char *str_a = luaL_checklstring(L, 1, &a);
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62 const char *str_b = luaL_checklstring(L, 2, &b);
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63
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64 luaL_buffinit(L, &buf);
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65
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66 if(a == 0 || b == 0) {
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67 lua_settop(L, 1);
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68 return 1;
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69 }
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70
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71 for(i = 0; i < a; i++) {
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72 luaL_addchar(&buf, str_a[i] ^ str_b[i % b]);
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73 }
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74
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75 luaL_pushresult(&buf);
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76 return 1;
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77 }
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78
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79 unsigned int clz(unsigned char c) {
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80 #if __GNUC__
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81 return __builtin_clz((unsigned int) c) - ((sizeof(int)-1)*CHAR_BIT);
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82 #else
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83 if(c & 0x80) return 0;
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84 if(c & 0x40) return 1;
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85 if(c & 0x20) return 2;
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86 if(c & 0x10) return 3;
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87 if(c & 0x08) return 4;
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88 if(c & 0x04) return 5;
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89 if(c & 0x02) return 6;
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90 if(c & 0x01) return 7;
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91 return 8;
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92 #endif
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93 }
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94
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95 LUA_API int strop_common_prefix_bits(lua_State *L) {
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96 size_t a, b, i;
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97 const char *str_a = luaL_checklstring(L, 1, &a);
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98 const char *str_b = luaL_checklstring(L, 2, &b);
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99
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100 size_t min_len = MIN(a, b);
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101
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102 for(i=0; i<min_len; i++) {
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103 if(str_a[i] != str_b[i]) {
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104 lua_pushinteger(L, i*8 + (clz(str_a[i] ^ str_b[i])));
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105 return 1;
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106 }
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107 }
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108
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109 lua_pushinteger(L, i*8);
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110 return 1;
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111 }
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112
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113 LUA_API int luaopen_prosody_util_strbitop(lua_State *L) {
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114 luaL_Reg exports[] = {
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115 { "sand", strop_and },
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116 { "sor", strop_or },
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117 { "sxor", strop_xor },
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118 { "common_prefix_bits", strop_common_prefix_bits },
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119 { NULL, NULL }
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120 };
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121
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122 lua_newtable(L);
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123 luaL_setfuncs(L, exports, 0);
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124 return 1;
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125 }
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126
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127 LUA_API int luaopen_util_strbitop(lua_State *L) {
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128 return luaopen_prosody_util_strbitop(L);
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129 }