lua/ubus.c

   1 /*
   2  * Copyright (C) 2012 Jo-Philipp Wich <jow@openwrt.org>
   3  * Copyright (C) 2012 John Crispin <blogic@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU Lesser General Public License version 2.1
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <unistd.h>
  16 #include <libubus.h>
  17 #include <libubox/blobmsg.h>
  18 #include <libubox/blobmsg_json.h>
  19 #include <lauxlib.h>
  20 #include <lua.h>
  21
  22 #define MODNAME         "ubus"
  23 #define METANAME        MODNAME ".meta"
  24
  25 static lua_State *state;
  26
  27 struct ubus_lua_connection {
  28         int timeout;
  29         struct blob_buf buf;
  30         struct ubus_context *ctx;
  31 };
  32
  33 struct ubus_lua_object {
  34         struct ubus_object o;
  35         int r;
  36 };
  37
  38 struct ubus_lua_event {
  39         struct ubus_event_handler e;
  40         int r;
  41 };
  42
  43 static int
  44 ubus_lua_parse_blob(lua_State *L, struct blob_attr *attr, bool table);
  45
  46 static int
  47 ubus_lua_parse_blob_array(lua_State *L, struct blob_attr *attr, int len, bool table)
  48 {
  49         int rv;
  50         int idx = 1;
  51         int rem = len;
  52         struct blob_attr *pos;
  53
  54         lua_newtable(L);
  55
  56         __blob_for_each_attr(pos, attr, rem)
  57         {
  58                 rv = ubus_lua_parse_blob(L, pos, table);
  59
  60                 if (rv > 1)
  61                         lua_rawset(L, -3);
  62                 else if (rv > 0)
  63                         lua_rawseti(L, -2, idx++);
  64         }
  65
  66         return 1;
  67 }
  68
  69 static int
  70 ubus_lua_parse_blob(lua_State *L, struct blob_attr *attr, bool table)
  71 {
  72         int len;
  73         int off = 0;
  74         void *data;
  75
  76         if (!blobmsg_check_attr(attr, false))
  77                 return 0;
  78
  79         if (table && blobmsg_name(attr)[0])
  80         {
  81                 lua_pushstring(L, blobmsg_name(attr));
  82                 off++;
  83         }
  84
  85         data = blobmsg_data(attr);
  86         len = blobmsg_data_len(attr);
  87
  88         switch (blob_id(attr))
  89         {
  90         case BLOBMSG_TYPE_BOOL:
  91                 lua_pushboolean(L, *(uint8_t *)data);
  92                 break;
  93
  94         case BLOBMSG_TYPE_INT16:
  95                 lua_pushinteger(L, be16_to_cpu(*(uint16_t *)data));
  96                 break;
  97
  98         case BLOBMSG_TYPE_INT32:
  99                 lua_pushinteger(L, be32_to_cpu(*(uint32_t *)data));
 100                 break;
 101
 102         case BLOBMSG_TYPE_INT64:
 103                 lua_pushnumber(L, (double) be64_to_cpu(*(uint64_t *)data));
 104                 break;
 105
 106         case BLOBMSG_TYPE_STRING:
 107                 lua_pushstring(L, data);
 108                 break;
 109
 110         case BLOBMSG_TYPE_ARRAY:
 111                 ubus_lua_parse_blob_array(L, data, len, false);
 112                 break;
 113
 114         case BLOBMSG_TYPE_TABLE:
 115                 ubus_lua_parse_blob_array(L, data, len, true);
 116                 break;
 117
 118         default:
 119                 lua_pushnil(L);
 120                 break;
 121         }
 122
 123         return off + 1;
 124 }
 125
 126
 127 static bool
 128 ubus_lua_format_blob_is_array(lua_State *L)
 129 {
 130         lua_Integer prv = 0;
 131         lua_Integer cur = 0;
 132
 133         /* Find out whether table is array-like */
 134         for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1))
 135         {
 136 #ifdef LUA_TINT
 137                 if (lua_type(L, -2) != LUA_TNUMBER && lua_type(L, -2) != LUA_TINT)
 138 #else
 139                 if (lua_type(L, -2) != LUA_TNUMBER)
 140 #endif
 141                 {
 142                         lua_pop(L, 2);
 143                         return false;
 144                 }
 145
 146                 cur = lua_tointeger(L, -2);
 147
 148                 if ((cur - 1) != prv)
 149                 {
 150                         lua_pop(L, 2);
 151                         return false;
 152                 }
 153
 154                 prv = cur;
 155         }
 156
 157         return true;
 158 }
 159
 160 static int
 161 ubus_lua_format_blob_array(lua_State *L, struct blob_buf *b, bool table);
 162
 163 static int
 164 ubus_lua_format_blob(lua_State *L, struct blob_buf *b, bool table)
 165 {
 166         void *c;
 167         bool rv = true;
 168         const char *key = table ? lua_tostring(L, -2) : NULL;
 169
 170         switch (lua_type(L, -1))
 171         {
 172         case LUA_TBOOLEAN:
 173                 blobmsg_add_u8(b, key, (uint8_t)lua_toboolean(L, -1));
 174                 break;
 175
 176 #ifdef LUA_TINT
 177         case LUA_TINT:
 178 #endif
 179         case LUA_TNUMBER:
 180                 blobmsg_add_u32(b, key, (uint32_t)lua_tointeger(L, -1));
 181                 break;
 182
 183         case LUA_TSTRING:
 184         case LUA_TUSERDATA:
 185         case LUA_TLIGHTUSERDATA:
 186                 blobmsg_add_string(b, key, lua_tostring(L, -1));
 187                 break;
 188
 189         case LUA_TTABLE:
 190                 if (ubus_lua_format_blob_is_array(L))
 191                 {
 192                         c = blobmsg_open_array(b, key);
 193                         rv = ubus_lua_format_blob_array(L, b, false);
 194                         blobmsg_close_array(b, c);
 195                 }
 196                 else
 197                 {
 198                         c = blobmsg_open_table(b, key);
 199                         rv = ubus_lua_format_blob_array(L, b, true);
 200                         blobmsg_close_table(b, c);
 201                 }
 202                 break;
 203
 204         default:
 205                 rv = false;
 206                 break;
 207         }
 208
 209         return rv;
 210 }
 211
 212 static int
 213 ubus_lua_format_blob_array(lua_State *L, struct blob_buf *b, bool table)
 214 {
 215         for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1))
 216         {
 217                 if (!ubus_lua_format_blob(L, b, table))
 218                 {
 219                         lua_pop(L, 1);
 220                         return false;
 221                 }
 222         }
 223
 224         return true;
 225 }
 226
 227
 228 static int
 229 ubus_lua_connect(lua_State *L)
 230 {
 231         struct ubus_lua_connection *c;
 232         const char *sockpath = luaL_optstring(L, 1, NULL);
 233         int timeout = luaL_optint(L, 2, 30);
 234
 235         if ((c = lua_newuserdata(L, sizeof(*c))) != NULL &&
 236                 (c->ctx = ubus_connect(sockpath)) != NULL)
 237         {
 238                 ubus_add_uloop(c->ctx);
 239                 c->timeout = timeout;
 240                 memset(&c->buf, 0, sizeof(c->buf));
 241                 luaL_getmetatable(L, METANAME);
 242                 lua_setmetatable(L, -2);
 243                 return 1;
 244         }
 245
 246         /* NB: no errors from ubus_connect() yet */
 247         lua_pushnil(L);
 248         lua_pushinteger(L, UBUS_STATUS_UNKNOWN_ERROR);
 249         return 2;
 250 }
 251
 252
 253 static void
 254 ubus_lua_objects_cb(struct ubus_context *c, struct ubus_object_data *o, void *p)
 255 {
 256         lua_State *L = (lua_State *)p;
 257
 258         lua_pushstring(L, o->path);
 259         lua_rawseti(L, -2, lua_objlen(L, -2) + 1);
 260 }
 261
 262 static int
 263 ubus_lua_objects(lua_State *L)
 264 {
 265         int rv;
 266         struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
 267
 268         lua_newtable(L);
 269         rv = ubus_lookup(c->ctx, NULL, ubus_lua_objects_cb, L);
 270
 271         if (rv != UBUS_STATUS_OK)
 272         {
 273                 lua_pop(L, 1);
 274                 lua_pushnil(L);
 275                 lua_pushinteger(L, rv);
 276                 return 2;
 277         }
 278
 279         return 1;
 280 }
 281
 282 static int
 283 ubus_method_handler(struct ubus_context *ctx, struct ubus_object *obj,
 284                 struct ubus_request_data *req, const char *method,
 285                 struct blob_attr *msg)
 286 {
 287         struct ubus_lua_object *o = container_of(obj, struct ubus_lua_object, o);
 288         int rv = 0;
 289
 290         lua_getglobal(state, "__ubus_cb");
 291         lua_rawgeti(state, -1, o->r);
 292         lua_getfield(state, -1, method);
 293         lua_remove(state, -2);
 294         lua_remove(state, -2);
 295
 296         if (lua_isfunction(state, -1)) {
 297                 lua_pushlightuserdata(state, req);
 298                 if (!msg)
 299                         lua_pushnil(state);
 300                 else
 301                         ubus_lua_parse_blob_array(state, blob_data(msg), blob_len(msg), true);
 302                 lua_call(state, 2, 1);
 303                 if (lua_isnumber(state, -1))
 304                         rv = lua_tonumber(state, -1);
 305         } else
 306                 lua_pop(state, 1);
 307
 308         return rv;
 309 }
 310
 311 static int lua_gettablelen(lua_State *L, int index)
 312 {
 313         int cnt = 0;
 314
 315         lua_pushnil(L);
 316         index -= 1;
 317         while (lua_next(L, index) != 0) {
 318                 cnt++;
 319                 lua_pop(L, 1);
 320         }
 321
 322         return cnt;
 323 }
 324
 325 static int ubus_lua_reply(lua_State *L)
 326 {
 327         struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
 328         struct ubus_request_data *req;
 329
 330         luaL_checktype(L, 3, LUA_TTABLE);
 331         blob_buf_init(&c->buf, 0);
 332
 333         if (!ubus_lua_format_blob_array(L, &c->buf, true))
 334         {
 335                 lua_pushnil(L);
 336                 lua_pushinteger(L, UBUS_STATUS_INVALID_ARGUMENT);
 337                 return 2;
 338         }
 339
 340         req = lua_touserdata(L, 2);
 341         ubus_send_reply(c->ctx, req, c->buf.head);
 342
 343         return 0;
 344 }
 345
 346 static int ubus_lua_load_methods(lua_State *L, struct ubus_method *m)
 347 {
 348         struct blobmsg_policy *p;
 349         int plen;
 350         int pidx = 0;
 351
 352         /* get the function pointer */
 353         lua_pushinteger(L, 1);
 354         lua_gettable(L, -2);
 355
 356         /* get the policy table */
 357         lua_pushinteger(L, 2);
 358         lua_gettable(L, -3);
 359
 360         /* check if the method table is valid */
 361         if ((lua_type(L, -2) != LUA_TFUNCTION) ||
 362                         (lua_type(L, -1) != LUA_TTABLE) ||
 363                         lua_objlen(L, -1)) {
 364                 lua_pop(L, 2);
 365                 return 1;
 366         }
 367
 368         /* store function pointer */
 369         lua_pushvalue(L, -2);
 370         lua_setfield(L, -6, lua_tostring(L, -5));
 371
 372         m->name = lua_tostring(L, -4);
 373         m->handler = ubus_method_handler;
 374
 375         plen = lua_gettablelen(L, -1);
 376
 377         /* exit if policy table is empty */
 378         if (!plen) {
 379                 lua_pop(L, 2);
 380                 return 0;
 381         }
 382
 383         /* setup the policy pointers */
 384         p = malloc(sizeof(struct blobmsg_policy) * plen);
 385         if (!p)
 386                 return 1;
 387
 388         memset(p, 0, sizeof(struct blobmsg_policy) * plen);
 389         m->policy = p;
 390         lua_pushnil(L);
 391         while (lua_next(L, -2) != 0) {
 392                 int val = lua_tointeger(L, -1);
 393
 394                 /* check if the policy is valid */
 395                 if ((lua_type(L, -2) != LUA_TSTRING) ||
 396                                 (lua_type(L, -1) != LUA_TNUMBER) ||
 397                                 (val < 0) ||
 398                                 (val > BLOBMSG_TYPE_LAST)) {
 399                         lua_pop(L, 1);
 400                         continue;
 401                 }
 402                 p[pidx].name = lua_tostring(L, -2);
 403                 p[pidx].type = val;
 404                 lua_pop(L, 1);
 405                 pidx++;
 406         }
 407
 408         m->n_policy = pidx;
 409         lua_pop(L, 2);
 410
 411         return 0;
 412 }
 413
 414 static struct ubus_object* ubus_lua_load_object(lua_State *L)
 415 {
 416         struct ubus_lua_object *obj = NULL;
 417         int mlen = lua_gettablelen(L, -1);
 418         struct ubus_method *m;
 419         int midx = 0;
 420
 421         /* setup object pointers */
 422         obj = malloc(sizeof(struct ubus_lua_object));
 423         if (!obj)
 424                 return NULL;
 425
 426         memset(obj, 0, sizeof(struct ubus_lua_object));
 427         obj->o.name = lua_tostring(L, -2);
 428
 429         /* setup method pointers */
 430         m = malloc(sizeof(struct ubus_method) * mlen);
 431         memset(m, 0, sizeof(struct ubus_method) * mlen);
 432         obj->o.methods = m;
 433
 434         /* setup type pointers */
 435         obj->o.type = malloc(sizeof(struct ubus_object_type));
 436         if (!obj->o.type) {
 437                 free(obj);
 438                 return NULL;
 439         }
 440
 441         memset(obj->o.type, 0, sizeof(struct ubus_object_type));
 442         obj->o.type->name = lua_tostring(L, -2);
 443         obj->o.type->id = 0;
 444         obj->o.type->methods = obj->o.methods;
 445
 446         /* create the callback lookup table */
 447         lua_createtable(L, 1, 0);
 448         lua_getglobal(L, "__ubus_cb");
 449         lua_pushvalue(L, -2);
 450         obj->r = luaL_ref(L, -2);
 451         lua_pop(L, 1);
 452
 453         /* scan each method */
 454         lua_pushnil(L);
 455         while (lua_next(L, -3) != 0) {
 456                 /* check if it looks like a method */
 457                 if ((lua_type(L, -2) != LUA_TSTRING) ||
 458                                 (lua_type(L, -1) != LUA_TTABLE) ||
 459                                 !lua_objlen(L, -1)) {
 460                         lua_pop(L, 1);
 461                         continue;
 462                 }
 463
 464                 if (!ubus_lua_load_methods(L, &m[midx]))
 465                         midx++;
 466                 lua_pop(L, 1);
 467         }
 468
 469         obj->o.type->n_methods = obj->o.n_methods = midx;
 470
 471         /* pop the callback table */
 472         lua_pop(L, 1);
 473
 474         return &obj->o;
 475 }
 476
 477 static int ubus_lua_add(lua_State *L)
 478 {
 479         struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
 480
 481         /* verify top level object */
 482         if (lua_istable(L, 1)) {
 483                 lua_pushstring(L, "you need to pass a table");
 484                 lua_error(L);
 485                 return 0;
 486         }
 487
 488         /* scan each object */
 489         lua_pushnil(L);
 490         while (lua_next(L, -2) != 0) {
 491                 struct ubus_object *obj = NULL;
 492
 493                 /* check if the object has a table of methods */
 494                 if ((lua_type(L, -2) == LUA_TSTRING) && (lua_type(L, -1) == LUA_TTABLE)) {
 495                         obj = ubus_lua_load_object(L);
 496
 497                         if (obj)
 498                                 ubus_add_object(c->ctx, obj);
 499                 }
 500                 lua_pop(L, 1);
 501         }
 502
 503         return 0;
 504 }
 505
 506 static void
 507 ubus_lua_signatures_cb(struct ubus_context *c, struct ubus_object_data *o, void *p)
 508 {
 509         lua_State *L = (lua_State *)p;
 510
 511         if (!o->signature)
 512                 return;
 513
 514         ubus_lua_parse_blob_array(L, blob_data(o->signature), blob_len(o->signature), true);
 515 }
 516
 517 static int
 518 ubus_lua_signatures(lua_State *L)
 519 {
 520         int rv;
 521         struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
 522         const char *path = luaL_checkstring(L, 2);
 523
 524         rv = ubus_lookup(c->ctx, path, ubus_lua_signatures_cb, L);
 525
 526         if (rv != UBUS_STATUS_OK)
 527         {
 528                 lua_pop(L, 1);
 529                 lua_pushnil(L);
 530                 lua_pushinteger(L, rv);
 531                 return 2;
 532         }
 533
 534         return 1;
 535 }
 536
 537
 538 static void
 539 ubus_lua_call_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 540 {
 541         lua_State *L = (lua_State *)req->priv;
 542
 543         if (!msg && L)
 544                 lua_pushnil(L);
 545
 546         if (msg && L)
 547                 ubus_lua_parse_blob_array(L, blob_data(msg), blob_len(msg), true);
 548 }
 549
 550 static int
 551 ubus_lua_call(lua_State *L)
 552 {
 553         int rv, top;
 554         uint32_t id;
 555         struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
 556         const char *path = luaL_checkstring(L, 2);
 557         const char *func = luaL_checkstring(L, 3);
 558
 559         luaL_checktype(L, 4, LUA_TTABLE);
 560         blob_buf_init(&c->buf, 0);
 561
 562         if (!ubus_lua_format_blob_array(L, &c->buf, true))
 563         {
 564                 lua_pushnil(L);
 565                 lua_pushinteger(L, UBUS_STATUS_INVALID_ARGUMENT);
 566                 return 2;
 567         }
 568
 569         rv = ubus_lookup_id(c->ctx, path, &id);
 570
 571         if (rv)
 572         {
 573                 lua_pushnil(L);
 574                 lua_pushinteger(L, rv);
 575                 return 2;
 576         }
 577
 578         top = lua_gettop(L);
 579         rv = ubus_invoke(c->ctx, id, func, c->buf.head, ubus_lua_call_cb, L, c->timeout * 1000);
 580
 581         if (rv != UBUS_STATUS_OK)
 582         {
 583                 lua_pop(L, 1);
 584                 lua_pushnil(L);
 585                 lua_pushinteger(L, rv);
 586                 return 2;
 587         }
 588
 589         return lua_gettop(L) - top;
 590 }
 591
 592 static void
 593 ubus_event_handler(struct ubus_context *ctx, struct ubus_event_handler *ev,
 594                         const char *type, struct blob_attr *msg)
 595 {
 596         struct ubus_lua_event *listener = container_of(ev, struct ubus_lua_event, e);
 597
 598         lua_getglobal(state, "__ubus_cb_event");
 599         lua_rawgeti(state, -1, listener->r);
 600         lua_remove(state, -2);
 601
 602         if (lua_isfunction(state, -1)) {
 603                 ubus_lua_parse_blob_array(state, blob_data(msg), blob_len(msg), true);
 604                 lua_call(state, 1, 0);
 605         } else {
 606                 lua_pop(state, 1);
 607         }
 608 }
 609
 610 static struct ubus_event_handler*
 611 ubus_lua_load_event(lua_State *L)
 612 {
 613         struct ubus_lua_event* event = NULL;
 614
 615         event = malloc(sizeof(struct ubus_lua_event));
 616         if (!event)
 617                 return NULL;
 618
 619         memset(event, 0, sizeof(struct ubus_lua_event));
 620         event->e.cb = ubus_event_handler;
 621
 622         /* update the he callback lookup table */
 623         lua_getglobal(L, "__ubus_cb_event");
 624         lua_pushvalue(L, -2);
 625         event->r = luaL_ref(L, -2);
 626         lua_setfield(L, -1, lua_tostring(L, -3));
 627
 628         return &event->e;
 629 }
 630
 631 static int
 632 ubus_lua_listen(lua_State *L) {
 633         struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
 634
 635         /* verify top level object */
 636         luaL_checktype(L, 2, LUA_TTABLE);
 637
 638         /* scan each object */
 639         lua_pushnil(L);
 640         while (lua_next(L, -2) != 0) {
 641                 struct ubus_event_handler *listener;
 642
 643                 /* check if the key is a string and the value is a method */
 644                 if ((lua_type(L, -2) == LUA_TSTRING) && (lua_type(L, -1) == LUA_TFUNCTION)) {
 645                         listener = ubus_lua_load_event(L);
 646                         if(listener != NULL) {
 647                                 ubus_register_event_handler(c->ctx, listener, lua_tostring(L, -2));
 648                         }
 649                 }
 650                 lua_pop(L, 1);
 651         }
 652         return 0;
 653 }
 654
 655 static int
 656 ubus_lua_send(lua_State *L)
 657 {
 658         struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
 659         const char *event = luaL_checkstring(L, 2);
 660
 661         if (*event == 0)
 662                 return luaL_argerror(L, 2, "no event name");
 663
 664         // Event content convert to ubus form
 665         luaL_checktype(L, 3, LUA_TTABLE);
 666         blob_buf_init(&c->buf, 0);
 667
 668         if (!ubus_lua_format_blob_array(L, &c->buf, true)) {
 669                 lua_pushnil(L);
 670                 lua_pushinteger(L, UBUS_STATUS_INVALID_ARGUMENT);
 671                 return 2;
 672         }
 673
 674         // Send the event
 675         ubus_send_event(c->ctx, event, c->buf.head);
 676
 677         return 0;
 678 }
 679
 680
 681
 682 static int
 683 ubus_lua__gc(lua_State *L)
 684 {
 685         struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
 686
 687         blob_buf_free(&c->buf);
 688         if (c->ctx != NULL)
 689         {
 690                 ubus_free(c->ctx);
 691                 memset(c, 0, sizeof(*c));
 692         }
 693
 694         return 0;
 695 }
 696
 697 static const luaL_Reg ubus[] = {
 698         { "connect", ubus_lua_connect },
 699         { "objects", ubus_lua_objects },
 700         { "add", ubus_lua_add },
 701         { "reply", ubus_lua_reply },
 702         { "signatures", ubus_lua_signatures },
 703         { "call", ubus_lua_call },
 704         { "close", ubus_lua__gc },
 705         { "listen", ubus_lua_listen },
 706         { "send", ubus_lua_send },
 707         { "__gc", ubus_lua__gc },
 708         { NULL, NULL },
 709 };
 710
 711 /* avoid missing prototype warning */
 712 int luaopen_ubus(lua_State *L);
 713
 714 int
 715 luaopen_ubus(lua_State *L)
 716 {
 717         /* create metatable */
 718         luaL_newmetatable(L, METANAME);
 719
 720         /* metatable.__index = metatable */
 721         lua_pushvalue(L, -1);
 722         lua_setfield(L, -2, "__index");
 723
 724         /* fill metatable */
 725         luaL_register(L, NULL, ubus);
 726         lua_pop(L, 1);
 727
 728         /* create module */
 729         luaL_register(L, MODNAME, ubus);
 730
 731         /* set some enum defines */
 732         lua_pushinteger(L, BLOBMSG_TYPE_ARRAY);
 733         lua_setfield(L, -2, "ARRAY");
 734         lua_pushinteger(L, BLOBMSG_TYPE_TABLE);
 735         lua_setfield(L, -2, "TABLE");
 736         lua_pushinteger(L, BLOBMSG_TYPE_STRING);
 737         lua_setfield(L, -2, "STRING");
 738         lua_pushinteger(L, BLOBMSG_TYPE_INT64);
 739         lua_setfield(L, -2, "INT64");
 740         lua_pushinteger(L, BLOBMSG_TYPE_INT32);
 741         lua_setfield(L, -2, "INT32");
 742         lua_pushinteger(L, BLOBMSG_TYPE_INT16);
 743         lua_setfield(L, -2, "INT16");
 744         lua_pushinteger(L, BLOBMSG_TYPE_INT8);
 745         lua_setfield(L, -2, "INT8");
 746         lua_pushinteger(L, BLOBMSG_TYPE_BOOL);
 747         lua_setfield(L, -2, "BOOLEAN");
 748
 749         /* used in our callbacks */
 750         state = L;
 751
 752         /* create the callback table */
 753         lua_createtable(L, 1, 0);
 754         lua_setglobal(L, "__ubus_cb");
 755
 756         /* create the event table */
 757         lua_createtable(L, 1, 0);
 758         lua_setglobal(L, "__ubus_cb_event");
 759
 760         return 0;
 761 }