Thierry Fournier | e726b14 | 2016-02-11 17:57:57 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Lua safe functions |
| 3 | * |
| 4 | * Copyright 2015-2016 Thierry Fournier <tfournier@arpalert.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * |
| 12 | * All the functions in this file runs with a Lua stack, and can |
Thierry Fournier | fb0b546 | 2016-01-21 09:28:58 +0100 | [diff] [blame] | 13 | * return with a longjmp. All of these function must be launched |
| 14 | * in an environment able to catch a longjmp, otherwise a |
| 15 | * critical error can be raised. |
| 16 | */ |
| 17 | #include <lauxlib.h> |
| 18 | #include <lua.h> |
| 19 | #include <lualib.h> |
| 20 | |
Thierry Fournier | b1f4656 | 2016-01-21 09:46:15 +0100 | [diff] [blame] | 21 | #include <common/time.h> |
| 22 | |
Thierry Fournier | 49d4842 | 2016-02-19 12:09:29 +0100 | [diff] [blame] | 23 | #include <types/hlua.h> |
| 24 | |
Thierry Fournier | 8b0d6e1 | 2016-03-16 18:29:13 +0100 | [diff] [blame] | 25 | #include <proto/dumpstats.h> |
Thierry Fournier | 94ed1c1 | 2016-02-24 08:06:32 +0100 | [diff] [blame] | 26 | #include <proto/proto_http.h> |
| 27 | |
Thierry Fournier | 1de1659 | 2016-01-27 09:49:07 +0100 | [diff] [blame] | 28 | /* Contains the class reference of the concat object. */ |
| 29 | static int class_concat_ref; |
| 30 | |
Thierry Fournier | 8b0d6e1 | 2016-03-16 18:29:13 +0100 | [diff] [blame] | 31 | /* This function gets a struct field and convert it in Lua |
| 32 | * variable. The variable is pushed at the top of the stak. |
| 33 | */ |
| 34 | int hlua_fcn_pushfield(lua_State *L, struct field *field) |
| 35 | { |
| 36 | /* The lua_Integer is always signed. Its length depends on |
| 37 | * compilation opions, so the followinfg code is conditionned |
| 38 | * by some macros. Windows maros are not supported. |
| 39 | * If the number cannot be represented as integer, we try to |
| 40 | * convert to float. |
| 41 | */ |
| 42 | switch (field_format(field, 0)) { |
| 43 | |
| 44 | case FF_EMPTY: |
| 45 | lua_pushnil(L); |
| 46 | return 1; |
| 47 | |
| 48 | case FF_S32: |
| 49 | /* S32 is always supported. */ |
| 50 | lua_pushinteger(L, field->u.s32); |
| 51 | return 1; |
| 52 | |
| 53 | case FF_U32: |
| 54 | #if (LUA_MAXINTEGER == LLONG_MAX || ((LUA_MAXINTEGER == LONG_MAX) && (__WORDSIZE == 64))) |
| 55 | /* 64 bits case, U32 is always supported */ |
| 56 | lua_pushinteger(L, field->u.u32); |
| 57 | #else |
| 58 | /* 32 bits case, U32 is supported until INT_MAX. */ |
| 59 | if (field->u.u32 > INT_MAX) |
| 60 | lua_pushnumber(L, (lua_Number)field->u.u32); |
| 61 | else |
| 62 | lua_pushinteger(L, field->u.u32); |
| 63 | #endif |
| 64 | return 1; |
| 65 | |
| 66 | case FF_S64: |
| 67 | #if (LUA_MAXINTEGER == LLONG_MAX || ((LUA_MAXINTEGER == LONG_MAX) && (__WORDSIZE == 64))) |
| 68 | /* 64 bits case, S64 is always supported */ |
| 69 | lua_pushinteger(L, field->u.s64); |
| 70 | #else |
| 71 | /* 64 bits case, S64 is supported beetween INT_MIN and INT_MAX */ |
| 72 | if (field->u.s64 < INT_MIN || field->u.s64 > INT_MAX) |
| 73 | lua_pushnumber(L, (lua_Number)field->u.s64); |
| 74 | else |
| 75 | lua_pushinteger(L, (int)field->u.s64); |
| 76 | #endif |
| 77 | return 1; |
| 78 | |
| 79 | case FF_U64: |
| 80 | #if (LUA_MAXINTEGER == LLONG_MAX || ((LUA_MAXINTEGER == LONG_MAX) && (__WORDSIZE == 64))) |
| 81 | /* 64 bits case, U64 is supported until LLONG_MAX */ |
| 82 | if (field->u.u64 > LLONG_MAX) |
| 83 | lua_pushnumber(L, (lua_Number)field->u.u64); |
| 84 | else |
| 85 | lua_pushinteger(L, field->u.u64); |
| 86 | #else |
| 87 | /* 64 bits case, U64 is supported until INT_MAX */ |
| 88 | if (field->u.u64 > INT_MAX) |
| 89 | lua_pushnumber(L, (lua_Number)field->u.u64); |
| 90 | else |
| 91 | lua_pushinteger(L, (int)field->u.u64); |
| 92 | #endif |
| 93 | return 1; |
| 94 | |
| 95 | case FF_STR: |
| 96 | lua_pushstring(L, field->u.str); |
| 97 | return 1; |
| 98 | |
| 99 | default: |
| 100 | break; |
| 101 | } |
| 102 | |
| 103 | /* Default case, never reached. */ |
| 104 | lua_pushnil(L); |
| 105 | return 1; |
| 106 | } |
| 107 | |
Thierry Fournier | 94ed1c1 | 2016-02-24 08:06:32 +0100 | [diff] [blame] | 108 | /* Some string are started or terminated by blank chars, |
| 109 | * this function removes the spaces, tabs, \r and |
| 110 | * \n at the begin and at the end of the string "str", and |
| 111 | * push the result in the lua stack. |
| 112 | * Returns a pointer to the Lua internal copy of the string. |
| 113 | */ |
| 114 | const char *hlua_pushstrippedstring(lua_State *L, const char *str) |
| 115 | { |
| 116 | const char *p; |
| 117 | const char *e; |
| 118 | |
| 119 | for (p = str; HTTP_IS_LWS(*p); p++); |
| 120 | for (e = p + strlen(p) - 1; e > p && HTTP_IS_LWS(*e); e--); |
| 121 | |
| 122 | return lua_pushlstring(L, p, e - p); |
| 123 | } |
| 124 | |
Thierry Fournier | ddd8988 | 2016-02-22 19:52:08 +0100 | [diff] [blame] | 125 | /* The three following functions are useful for adding entries |
| 126 | * in a table. These functions takes a string and respectively an |
| 127 | * integer, a string or a function and add it to the table in the |
| 128 | * top of the stack. |
| 129 | * |
| 130 | * These functions throws an error if no more stack size is |
| 131 | * available. |
| 132 | */ |
| 133 | void hlua_class_const_int(lua_State *L, const char *name, int value) |
| 134 | { |
Thierry Fournier | ddd8988 | 2016-02-22 19:52:08 +0100 | [diff] [blame] | 135 | lua_pushstring(L, name); |
| 136 | lua_pushinteger(L, value); |
| 137 | lua_rawset(L, -3); |
| 138 | } |
| 139 | void hlua_class_const_str(lua_State *L, const char *name, const char *value) |
| 140 | { |
Thierry Fournier | ddd8988 | 2016-02-22 19:52:08 +0100 | [diff] [blame] | 141 | lua_pushstring(L, name); |
| 142 | lua_pushstring(L, value); |
| 143 | lua_rawset(L, -3); |
| 144 | } |
| 145 | void hlua_class_function(lua_State *L, const char *name, int (*function)(lua_State *L)) |
| 146 | { |
Thierry Fournier | ddd8988 | 2016-02-22 19:52:08 +0100 | [diff] [blame] | 147 | lua_pushstring(L, name); |
| 148 | lua_pushcclosure(L, function, 0); |
| 149 | lua_rawset(L, -3); |
| 150 | } |
| 151 | |
| 152 | /* This function returns a string containg the HAProxy object name. */ |
| 153 | int hlua_dump_object(struct lua_State *L) |
| 154 | { |
| 155 | const char *name = (const char *)lua_tostring(L, lua_upvalueindex(1)); |
| 156 | lua_pushfstring(L, "HAProxy class %s", name); |
| 157 | return 1; |
| 158 | } |
| 159 | |
Thierry Fournier | 45e78d7 | 2016-02-19 18:34:46 +0100 | [diff] [blame] | 160 | /* This function register a table as metatable and. It names |
| 161 | * the metatable, and returns the associated reference. |
| 162 | * The original table is poped from the top of the stack. |
| 163 | * "name" is the referenced class name. |
| 164 | */ |
| 165 | int hlua_register_metatable(struct lua_State *L, char *name) |
| 166 | { |
| 167 | /* Check the type of the top element. it must be |
| 168 | * a table. |
| 169 | */ |
| 170 | if (lua_type(L, -1) != LUA_TTABLE) |
| 171 | luaL_error(L, "hlua_register_metatable() requires a type Table " |
| 172 | "in the top of the stack"); |
| 173 | |
| 174 | /* Add the __tostring function which identify the |
| 175 | * created object. |
| 176 | */ |
| 177 | lua_pushstring(L, "__tostring"); |
| 178 | lua_pushstring(L, name); |
| 179 | lua_pushcclosure(L, hlua_dump_object, 1); |
| 180 | lua_rawset(L, -3); |
| 181 | |
| 182 | /* Register a named entry for the table. The table |
| 183 | * reference is copyed first because the function |
| 184 | * lua_setfield() pop the entry. |
| 185 | */ |
| 186 | lua_pushvalue(L, -1); |
| 187 | lua_setfield(L, LUA_REGISTRYINDEX, name); |
| 188 | |
| 189 | /* Creates the reference of the object. The |
| 190 | * function luaL_ref pop the top of the stack. |
| 191 | */ |
| 192 | return luaL_ref(L, LUA_REGISTRYINDEX); |
| 193 | } |
| 194 | |
Thierry Fournier | 9e7e3ea | 2016-01-27 09:55:30 +0100 | [diff] [blame] | 195 | /* Return an object of the expected type, or throws an error. */ |
| 196 | void *hlua_checkudata(lua_State *L, int ud, int class_ref) |
| 197 | { |
| 198 | void *p; |
Thierry Fournier | 5351827 | 2016-01-27 10:34:09 +0100 | [diff] [blame] | 199 | int ret; |
Thierry Fournier | 9e7e3ea | 2016-01-27 09:55:30 +0100 | [diff] [blame] | 200 | |
| 201 | /* Check if the stack entry is an array. */ |
| 202 | if (!lua_istable(L, ud)) |
Thierry Fournier | 5351827 | 2016-01-27 10:34:09 +0100 | [diff] [blame] | 203 | luaL_argerror(L, ud, NULL); |
| 204 | |
| 205 | /* pop the metatable of the referencecd object. */ |
| 206 | if (!lua_getmetatable(L, ud)) |
| 207 | luaL_argerror(L, ud, NULL); |
| 208 | |
| 209 | /* pop the expected metatable. */ |
| 210 | lua_rawgeti(L, LUA_REGISTRYINDEX, class_ref); |
| 211 | |
Thierry Fournier | 9e7e3ea | 2016-01-27 09:55:30 +0100 | [diff] [blame] | 212 | /* Check if the metadata have the expected type. */ |
Thierry Fournier | 5351827 | 2016-01-27 10:34:09 +0100 | [diff] [blame] | 213 | ret = lua_rawequal(L, -1, -2); |
| 214 | lua_pop(L, 2); |
| 215 | if (!ret) |
| 216 | luaL_argerror(L, ud, NULL); |
| 217 | |
Thierry Fournier | 9e7e3ea | 2016-01-27 09:55:30 +0100 | [diff] [blame] | 218 | /* Push on the stack at the entry [0] of the table. */ |
| 219 | lua_rawgeti(L, ud, 0); |
Thierry Fournier | 5351827 | 2016-01-27 10:34:09 +0100 | [diff] [blame] | 220 | |
Thierry Fournier | 9e7e3ea | 2016-01-27 09:55:30 +0100 | [diff] [blame] | 221 | /* Check if this entry is userdata. */ |
| 222 | p = lua_touserdata(L, -1); |
| 223 | if (!p) |
Thierry Fournier | 5351827 | 2016-01-27 10:34:09 +0100 | [diff] [blame] | 224 | luaL_argerror(L, ud, NULL); |
| 225 | |
Thierry Fournier | 9e7e3ea | 2016-01-27 09:55:30 +0100 | [diff] [blame] | 226 | /* Remove the entry returned by lua_rawgeti(). */ |
| 227 | lua_pop(L, 1); |
Thierry Fournier | 5351827 | 2016-01-27 10:34:09 +0100 | [diff] [blame] | 228 | |
Thierry Fournier | 9e7e3ea | 2016-01-27 09:55:30 +0100 | [diff] [blame] | 229 | /* Return the associated struct. */ |
| 230 | return p; |
| 231 | } |
| 232 | |
Thierry Fournier | b1f4656 | 2016-01-21 09:46:15 +0100 | [diff] [blame] | 233 | /* This function return the current date at epoch format in milliseconds. */ |
| 234 | int hlua_now(lua_State *L) |
| 235 | { |
| 236 | lua_newtable(L); |
| 237 | lua_pushstring(L, "sec"); |
| 238 | lua_pushinteger(L, now.tv_sec); |
| 239 | lua_rawset(L, -3); |
| 240 | lua_pushstring(L, "usec"); |
| 241 | lua_pushinteger(L, now.tv_usec); |
| 242 | lua_rawset(L, -3); |
| 243 | return 1; |
| 244 | } |
| 245 | |
Thierry Fournier | 1550d5d | 2016-01-21 09:35:41 +0100 | [diff] [blame] | 246 | /* This functions expects a Lua string as HTTP date, parse it and |
| 247 | * returns an integer containing the epoch format of the date, or |
| 248 | * nil if the parsing fails. |
| 249 | */ |
| 250 | static int hlua_parse_date(lua_State *L, int (*fcn)(const char *, int, struct tm*)) |
| 251 | { |
| 252 | const char *str; |
| 253 | size_t len; |
| 254 | struct tm tm; |
| 255 | time_t time; |
| 256 | |
| 257 | str = luaL_checklstring(L, 1, &len); |
| 258 | |
| 259 | if (!fcn(str, len, &tm)) { |
| 260 | lua_pushnil(L); |
| 261 | return 1; |
| 262 | } |
| 263 | |
| 264 | /* This function considers the content of the broken-down time |
| 265 | * is exprimed in the UTC timezone. timegm don't care about |
| 266 | * the gnu variable tm_gmtoff. If gmtoff is set, or if you know |
| 267 | * the timezone from the broken-down time, it must be fixed |
| 268 | * after the conversion. |
| 269 | */ |
| 270 | time = timegm(&tm); |
| 271 | if (time == -1) { |
| 272 | lua_pushnil(L); |
| 273 | return 1; |
| 274 | } |
| 275 | |
| 276 | lua_pushinteger(L, (int)time); |
| 277 | return 1; |
| 278 | } |
| 279 | static int hlua_http_date(lua_State *L) |
| 280 | { |
| 281 | return hlua_parse_date(L, parse_http_date); |
| 282 | } |
| 283 | static int hlua_imf_date(lua_State *L) |
| 284 | { |
| 285 | return hlua_parse_date(L, parse_imf_date); |
| 286 | } |
| 287 | static int hlua_rfc850_date(lua_State *L) |
| 288 | { |
| 289 | return hlua_parse_date(L, parse_rfc850_date); |
| 290 | } |
| 291 | static int hlua_asctime_date(lua_State *L) |
| 292 | { |
| 293 | return hlua_parse_date(L, parse_asctime_date); |
| 294 | } |
| 295 | |
Thierry Fournier | 49d4842 | 2016-02-19 12:09:29 +0100 | [diff] [blame] | 296 | static struct hlua_concat *hlua_check_concat(lua_State *L, int ud) |
Thierry Fournier | 1de1659 | 2016-01-27 09:49:07 +0100 | [diff] [blame] | 297 | { |
Thierry Fournier | 49d4842 | 2016-02-19 12:09:29 +0100 | [diff] [blame] | 298 | return (struct hlua_concat *)(hlua_checkudata(L, ud, class_concat_ref)); |
Thierry Fournier | 1de1659 | 2016-01-27 09:49:07 +0100 | [diff] [blame] | 299 | } |
| 300 | |
| 301 | static int hlua_concat_add(lua_State *L) |
| 302 | { |
Thierry Fournier | 49d4842 | 2016-02-19 12:09:29 +0100 | [diff] [blame] | 303 | struct hlua_concat *b; |
| 304 | char *buffer; |
| 305 | char *new; |
Thierry Fournier | 1de1659 | 2016-01-27 09:49:07 +0100 | [diff] [blame] | 306 | const char *str; |
| 307 | size_t l; |
| 308 | |
| 309 | /* First arg must be a concat object. */ |
| 310 | b = hlua_check_concat(L, 1); |
| 311 | |
| 312 | /* Second arg must be a string. */ |
| 313 | str = luaL_checklstring(L, 2, &l); |
| 314 | |
Thierry Fournier | 49d4842 | 2016-02-19 12:09:29 +0100 | [diff] [blame] | 315 | /* Get the buffer. */ |
| 316 | lua_rawgeti(L, 1, 1); |
| 317 | buffer = lua_touserdata(L, -1); |
| 318 | lua_pop(L, 1); |
| 319 | |
| 320 | /* Update the buffer size if it s required. The old buffer |
| 321 | * is crushed by the new in the object array, so it will |
| 322 | * be deleted by the GC. |
| 323 | * Note that in the first loop, the "new" variable is only |
| 324 | * used as a flag. |
| 325 | */ |
| 326 | new = NULL; |
| 327 | while (b->size - b->len < l) { |
| 328 | b->size += HLUA_CONCAT_BLOCSZ; |
| 329 | new = buffer; |
| 330 | } |
| 331 | if (new) { |
| 332 | new = lua_newuserdata(L, b->size); |
| 333 | memcpy(new, buffer, b->len); |
| 334 | lua_rawseti(L, 1, 1); |
| 335 | buffer = new; |
| 336 | } |
| 337 | |
| 338 | /* Copy string, and update metadata. */ |
| 339 | memcpy(buffer + b->len, str, l); |
| 340 | b->len += l; |
Thierry Fournier | 1de1659 | 2016-01-27 09:49:07 +0100 | [diff] [blame] | 341 | return 0; |
| 342 | } |
| 343 | |
| 344 | static int hlua_concat_dump(lua_State *L) |
| 345 | { |
Thierry Fournier | 49d4842 | 2016-02-19 12:09:29 +0100 | [diff] [blame] | 346 | struct hlua_concat *b; |
| 347 | char *buffer; |
Thierry Fournier | 1de1659 | 2016-01-27 09:49:07 +0100 | [diff] [blame] | 348 | |
| 349 | /* First arg must be a concat object. */ |
| 350 | b = hlua_check_concat(L, 1); |
| 351 | |
Thierry Fournier | 49d4842 | 2016-02-19 12:09:29 +0100 | [diff] [blame] | 352 | /* Get the buffer. */ |
| 353 | lua_rawgeti(L, 1, 1); |
| 354 | buffer = lua_touserdata(L, -1); |
| 355 | lua_pop(L, 1); |
| 356 | |
Thierry Fournier | 1de1659 | 2016-01-27 09:49:07 +0100 | [diff] [blame] | 357 | /* Push the soncatenated strng in the stack. */ |
Thierry Fournier | 49d4842 | 2016-02-19 12:09:29 +0100 | [diff] [blame] | 358 | lua_pushlstring(L, buffer, b->len); |
Thierry Fournier | 1de1659 | 2016-01-27 09:49:07 +0100 | [diff] [blame] | 359 | return 1; |
| 360 | } |
| 361 | |
| 362 | int hlua_concat_new(lua_State *L) |
| 363 | { |
Thierry Fournier | 49d4842 | 2016-02-19 12:09:29 +0100 | [diff] [blame] | 364 | struct hlua_concat *b; |
Thierry Fournier | 1de1659 | 2016-01-27 09:49:07 +0100 | [diff] [blame] | 365 | |
| 366 | lua_newtable(L); |
Thierry Fournier | 49d4842 | 2016-02-19 12:09:29 +0100 | [diff] [blame] | 367 | b = (struct hlua_concat *)lua_newuserdata(L, sizeof(*b)); |
| 368 | b->size = HLUA_CONCAT_BLOCSZ; |
| 369 | b->len = 0; |
Thierry Fournier | 1de1659 | 2016-01-27 09:49:07 +0100 | [diff] [blame] | 370 | lua_rawseti(L, -2, 0); |
Thierry Fournier | 49d4842 | 2016-02-19 12:09:29 +0100 | [diff] [blame] | 371 | lua_newuserdata(L, HLUA_CONCAT_BLOCSZ); |
| 372 | lua_rawseti(L, -2, 1); |
Thierry Fournier | 1de1659 | 2016-01-27 09:49:07 +0100 | [diff] [blame] | 373 | |
| 374 | lua_rawgeti(L, LUA_REGISTRYINDEX, class_concat_ref); |
| 375 | lua_setmetatable(L, -2); |
| 376 | |
Thierry Fournier | 1de1659 | 2016-01-27 09:49:07 +0100 | [diff] [blame] | 377 | return 1; |
| 378 | } |
| 379 | |
| 380 | static int concat_tostring(lua_State *L) |
| 381 | { |
| 382 | const void *ptr = lua_topointer(L, 1); |
| 383 | lua_pushfstring(L, "Concat object: %p", ptr); |
| 384 | return 1; |
| 385 | } |
| 386 | |
| 387 | static int hlua_concat_init(lua_State *L) |
| 388 | { |
| 389 | /* Creates the buffered concat object. */ |
| 390 | lua_newtable(L); |
| 391 | |
| 392 | lua_pushstring(L, "__tostring"); |
| 393 | lua_pushcclosure(L, concat_tostring, 0); |
| 394 | lua_settable(L, -3); |
| 395 | |
| 396 | lua_pushstring(L, "__index"); /* Creates the index entry. */ |
| 397 | lua_newtable(L); /* The "__index" content. */ |
| 398 | |
| 399 | lua_pushstring(L, "add"); |
| 400 | lua_pushcclosure(L, hlua_concat_add, 0); |
| 401 | lua_settable(L, -3); |
| 402 | |
| 403 | lua_pushstring(L, "dump"); |
| 404 | lua_pushcclosure(L, hlua_concat_dump, 0); |
| 405 | lua_settable(L, -3); |
| 406 | |
| 407 | lua_settable(L, -3); /* Sets the __index entry. */ |
| 408 | class_concat_ref = luaL_ref(L, LUA_REGISTRYINDEX); |
| 409 | |
| 410 | return 1; |
| 411 | } |
| 412 | |
Thierry Fournier | 3d4a675 | 2016-02-19 20:53:30 +0100 | [diff] [blame] | 413 | int hlua_fcn_post_init(lua_State *L) |
| 414 | { |
| 415 | return 1; |
| 416 | } |
| 417 | |
Thierry Fournier | fb0b546 | 2016-01-21 09:28:58 +0100 | [diff] [blame] | 418 | int hlua_fcn_reg_core_fcn(lua_State *L) |
| 419 | { |
Thierry Fournier | 1de1659 | 2016-01-27 09:49:07 +0100 | [diff] [blame] | 420 | if (!hlua_concat_init(L)) |
| 421 | return 0; |
| 422 | |
Thierry Fournier | 4f99b27 | 2016-02-22 08:40:02 +0100 | [diff] [blame] | 423 | hlua_class_function(L, "now", hlua_now); |
| 424 | hlua_class_function(L, "http_date", hlua_http_date); |
| 425 | hlua_class_function(L, "imf_date", hlua_imf_date); |
| 426 | hlua_class_function(L, "rfc850_date", hlua_rfc850_date); |
| 427 | hlua_class_function(L, "asctime_date", hlua_asctime_date); |
| 428 | hlua_class_function(L, "concat", hlua_concat_new); |
| 429 | |
Thierry Fournier | 1550d5d | 2016-01-21 09:35:41 +0100 | [diff] [blame] | 430 | return 5; |
Thierry Fournier | fb0b546 | 2016-01-21 09:28:58 +0100 | [diff] [blame] | 431 | } |