lua/ubus.c

   1 /*
   2  * Copyright (C) 2012 Jo-Philipp Wich <jow@openwrt.org>
   3  * Copyright (C) 2012 John Crispin <blogic@openwrt.org>
   4  * Copyright (C) 2016 Iain Fraser <iainf@netduma.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU Lesser General Public License version 2.1
   8  * as published by the Free Software Foundation
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <unistd.h>
  17 #include <libubus.h>
  18 #include <libubox/blobmsg.h>
  19 #include <libubox/blobmsg_json.h>
  20 #include <lauxlib.h>
  21 #include <lua.h>
  22
  23 #define MODNAME         "ubus"
  24 #define METANAME        MODNAME ".meta"
  25
  26 static lua_State *state;
  27
  28 struct ubus_lua_connection {
  29         int timeout;
  30         struct blob_buf buf;
  31         struct ubus_context *ctx;
  32 };
  33
  34 struct ubus_lua_object {
  35         struct ubus_object o;
  36         int r;
  37         int rsubscriber;
  38 };
  39
  40 struct ubus_lua_event {
  41         struct ubus_event_handler e;
  42         int r;
  43 };
  44
  45 struct ubus_lua_subscriber {
  46         struct ubus_subscriber s;
  47         int rnotify;
  48         int rremove;
  49 };
  50
  51 static int
  52 ubus_lua_parse_blob(lua_State *L, struct blob_attr *attr, bool table);
  53
  54 static int
  55 ubus_lua_parse_blob_array(lua_State *L, struct blob_attr *attr, size_t len, bool table)
  56 {
  57         int rv;
  58         int idx = 1;
  59         size_t rem = len;
  60         struct blob_attr *pos;
  61
  62         lua_newtable(L);
  63
  64         __blob_for_each_attr(pos, attr, rem)
  65         {
  66                 rv = ubus_lua_parse_blob(L, pos, table);
  67
  68                 if (rv > 1)
  69                         lua_rawset(L, -3);
  70                 else if (rv > 0)
  71                         lua_rawseti(L, -2, idx++);
  72         }
  73
  74         return 1;
  75 }
  76
  77 static int
  78 ubus_lua_parse_blob(lua_State *L, struct blob_attr *attr, bool table)
  79 {
  80         int len;
  81         int off = 0;
  82         void *data;
  83
  84         if (!blobmsg_check_attr(attr, false))
  85                 return 0;
  86
  87         if (table && blobmsg_name(attr)[0])
  88         {
  89                 lua_pushstring(L, blobmsg_name(attr));
  90                 off++;
  91         }
  92
  93         data = blobmsg_data(attr);
  94         len = blobmsg_data_len(attr);
  95
  96         switch (blob_id(attr))
  97         {
  98         case BLOBMSG_TYPE_BOOL:
  99                 lua_pushboolean(L, *(uint8_t *)data);
 100                 break;
 101
 102         case BLOBMSG_TYPE_INT16:
 103                 lua_pushinteger(L, be16_to_cpu(*(uint16_t *)data));
 104                 break;
 105
 106         case BLOBMSG_TYPE_INT32:
 107                 lua_pushinteger(L, be32_to_cpu(*(uint32_t *)data));
 108                 break;
 109
 110         case BLOBMSG_TYPE_INT64:
 111                 lua_pushnumber(L, (double) be64_to_cpu(*(uint64_t *)data));
 112                 break;
 113
 114         case BLOBMSG_TYPE_DOUBLE:
 115                 {
 116                         union {
 117                                 double d;
 118                                 uint64_t u64;
 119                         } v;
 120                         v.u64 = be64_to_cpu(*(uint64_t *)data);
 121                         lua_pushnumber(L, v.d);
 122                 }
 123                 break;
 124
 125         case BLOBMSG_TYPE_STRING:
 126                 lua_pushstring(L, data);
 127                 break;
 128
 129         case BLOBMSG_TYPE_ARRAY:
 130                 ubus_lua_parse_blob_array(L, data, len, false);
 131                 break;
 132
 133         case BLOBMSG_TYPE_TABLE:
 134                 ubus_lua_parse_blob_array(L, data, len, true);
 135                 break;
 136
 137         default:
 138                 lua_pushnil(L);
 139                 break;
 140         }
 141
 142         return off + 1;
 143 }
 144
 145
 146 static bool
 147 ubus_lua_format_blob_is_array(lua_State *L)
 148 {
 149         lua_Integer prv = 0;
 150         lua_Integer cur = 0;
 151
 152         /* Find out whether table is array-like */
 153         for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1))
 154         {
 155 #ifdef LUA_TINT
 156                 if (lua_type(L, -2) != LUA_TNUMBER && lua_type(L, -2) != LUA_TINT)
 157 #else
 158                 if (lua_type(L, -2) != LUA_TNUMBER)
 159 #endif
 160                 {
 161                         lua_pop(L, 2);
 162                         return false;
 163                 }
 164
 165                 cur = lua_tointeger(L, -2);
 166
 167                 if ((cur - 1) != prv)
 168                 {
 169                         lua_pop(L, 2);
 170                         return false;
 171                 }
 172
 173                 prv = cur;
 174         }
 175
 176         return true;
 177 }
 178
 179 static int
 180 ubus_lua_format_blob_array(lua_State *L, struct blob_buf *b, bool table);
 181
 182 static int
 183 ubus_lua_format_blob(lua_State *L, struct blob_buf *b, bool table)
 184 {
 185         void *c;
 186         bool rv = true;
 187         const char *key = table ? lua_tostring(L, -2) : NULL;
 188
 189         switch (lua_type(L, -1))
 190         {
 191         case LUA_TBOOLEAN:
 192                 blobmsg_add_u8(b, key, (uint8_t)lua_toboolean(L, -1));
 193                 break;
 194
 195 #ifdef LUA_TINT
 196         case LUA_TINT:
 197 #endif
 198         case LUA_TNUMBER:
 199                 if ((uint64_t)lua_tonumber(L, -1) > INT_MAX)
 200                         blobmsg_add_u64(b, key, (uint64_t)lua_tonumber(L, -1));
 201                 else
 202                         blobmsg_add_u32(b, key, (uint32_t)lua_tointeger(L, -1));
 203                 break;
 204
 205         case LUA_TSTRING:
 206         case LUA_TUSERDATA:
 207         case LUA_TLIGHTUSERDATA:
 208                 blobmsg_add_string(b, key, lua_tostring(L, -1));
 209                 break;
 210
 211         case LUA_TTABLE:
 212                 if (ubus_lua_format_blob_is_array(L))
 213                 {
 214                         c = blobmsg_open_array(b, key);
 215                         rv = ubus_lua_format_blob_array(L, b, false);
 216                         blobmsg_close_array(b, c);
 217                 }
 218                 else
 219                 {
 220                         c = blobmsg_open_table(b, key);
 221                         rv = ubus_lua_format_blob_array(L, b, true);
 222                         blobmsg_close_table(b, c);
 223                 }
 224                 break;
 225
 226         default:
 227                 rv = false;
 228                 break;
 229         }
 230
 231         return rv;
 232 }
 233
 234 static int
 235 ubus_lua_format_blob_array(lua_State *L, struct blob_buf *b, bool table)
 236 {
 237         for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1))
 238         {
 239                 if (!ubus_lua_format_blob(L, b, table))
 240                 {
 241                         lua_pop(L, 1);
 242                         return false;
 243                 }
 244         }
 245
 246         return true;
 247 }
 248
 249
 250 static int
 251 ubus_lua_connect(lua_State *L)
 252 {
 253         struct ubus_lua_connection *c;
 254         const char *sockpath = luaL_optstring(L, 1, NULL);
 255         int timeout = luaL_optint(L, 2, 30);
 256
 257         if ((c = lua_newuserdata(L, sizeof(*c))) != NULL &&
 258                 (c->ctx = ubus_connect(sockpath)) != NULL)
 259         {
 260                 ubus_add_uloop(c->ctx);
 261                 c->timeout = timeout;
 262                 memset(&c->buf, 0, sizeof(c->buf));
 263                 luaL_getmetatable(L, METANAME);
 264                 lua_setmetatable(L, -2);
 265                 return 1;
 266         }
 267
 268         /* NB: no errors from ubus_connect() yet */
 269         lua_pushnil(L);
 270         lua_pushinteger(L, UBUS_STATUS_UNKNOWN_ERROR);
 271         return 2;
 272 }
 273
 274
 275 static void
 276 ubus_lua_objects_cb(struct ubus_context *c, struct ubus_object_data *o, void *p)
 277 {
 278         lua_State *L = (lua_State *)p;
 279
 280         lua_pushstring(L, o->path);
 281         lua_rawseti(L, -2, lua_objlen(L, -2) + 1);
 282 }
 283
 284 static int
 285 ubus_lua_objects(lua_State *L)
 286 {
 287         int rv;
 288         struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
 289
 290         lua_newtable(L);
 291         rv = ubus_lookup(c->ctx, NULL, ubus_lua_objects_cb, L);
 292
 293         if (rv != UBUS_STATUS_OK)
 294         {
 295                 lua_pop(L, 1);
 296                 lua_pushnil(L);
 297                 lua_pushinteger(L, rv);
 298                 return 2;
 299         }
 300
 301         return 1;
 302 }
 303
 304 static int
 305 ubus_method_handler(struct ubus_context *ctx, struct ubus_object *obj,
 306                 struct ubus_request_data *req, const char *method,
 307                 struct blob_attr *msg)
 308 {
 309         struct ubus_lua_object *o = container_of(obj, struct ubus_lua_object, o);
 310         int rv = 0;
 311
 312         lua_getglobal(state, "__ubus_cb");
 313         lua_rawgeti(state, -1, o->r);
 314         lua_getfield(state, -1, method);
 315         lua_remove(state, -2);
 316         lua_remove(state, -2);
 317
 318         if (lua_isfunction(state, -1)) {
 319                 lua_pushlightuserdata(state, req);
 320                 if (!msg)
 321                         lua_pushnil(state);
 322                 else
 323                         ubus_lua_parse_blob_array(state, blob_data(msg), blob_len(msg), true);
 324                 lua_call(state, 2, 1);
 325                 if (lua_isnumber(state, -1))
 326                         rv = lua_tonumber(state, -1);
 327         }
 328
 329         lua_pop(state, 1);
 330
 331         return rv;
 332 }
 333
 334 static int lua_gettablelen(lua_State *L, int index)
 335 {
 336         int cnt = 0;
 337
 338         lua_pushnil(L);
 339         index -= 1;
 340         while (lua_next(L, index) != 0) {
 341                 cnt++;
 342                 lua_pop(L, 1);
 343         }
 344
 345         return cnt;
 346 }
 347
 348 static int ubus_lua_reply(lua_State *L)
 349 {
 350         struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
 351         struct ubus_request_data *req;
 352
 353         luaL_checktype(L, 3, LUA_TTABLE);
 354         blob_buf_init(&c->buf, 0);
 355
 356         if (!ubus_lua_format_blob_array(L, &c->buf, true))
 357         {
 358                 lua_pushnil(L);
 359                 lua_pushinteger(L, UBUS_STATUS_INVALID_ARGUMENT);
 360                 return 2;
 361         }
 362
 363         req = lua_touserdata(L, 2);
 364         ubus_send_reply(c->ctx, req, c->buf.head);
 365
 366         return 0;
 367 }
 368
 369 static int ubus_lua_defer_request(lua_State *L)
 370 {
 371         struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
 372         struct ubus_request_data *req = lua_touserdata(L, 2);
 373         struct ubus_request_data *new_req = lua_newuserdata(L, sizeof(struct ubus_request_data));
 374         ubus_defer_request(c->ctx, req, new_req);
 375
 376         return 1;
 377 }
 378
 379 static int ubus_lua_complete_deferred_request(lua_State *L)
 380 {
 381         struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
 382         struct ubus_request_data *req = lua_touserdata(L, 2);
 383         int ret = luaL_checkinteger(L, 3);
 384         ubus_complete_deferred_request(c->ctx, req, ret);
 385
 386         return 0;
 387 }
 388
 389 static int ubus_lua_load_methods(lua_State *L, struct ubus_method *m)
 390 {
 391         struct blobmsg_policy *p;
 392         int plen;
 393         int pidx = 0;
 394
 395         /* get the function pointer */
 396         lua_pushinteger(L, 1);
 397         lua_gettable(L, -2);
 398
 399         /* get the policy table */
 400         lua_pushinteger(L, 2);
 401         lua_gettable(L, -3);
 402
 403         /* check if the method table is valid */
 404         if ((lua_type(L, -2) != LUA_TFUNCTION) ||
 405                         (lua_type(L, -1) != LUA_TTABLE) ||
 406                         lua_objlen(L, -1)) {
 407                 lua_pop(L, 2);
 408                 return 1;
 409         }
 410
 411         /* store function pointer */
 412         lua_pushvalue(L, -2);
 413         lua_setfield(L, -6, lua_tostring(L, -5));
 414
 415         m->name = lua_tostring(L, -4);
 416         m->handler = ubus_method_handler;
 417
 418         plen = lua_gettablelen(L, -1);
 419
 420         /* exit if policy table is empty */
 421         if (!plen) {
 422                 lua_pop(L, 2);
 423                 return 0;
 424         }
 425
 426         /* setup the policy pointers */
 427         p = calloc(plen, sizeof(struct blobmsg_policy));
 428         if (!p)
 429                 return 1;
 430
 431         m->policy = p;
 432         lua_pushnil(L);
 433         while (lua_next(L, -2) != 0) {
 434                 int val = lua_tointeger(L, -1);
 435
 436                 /* check if the policy is valid */
 437                 if ((lua_type(L, -2) != LUA_TSTRING) ||
 438                                 (lua_type(L, -1) != LUA_TNUMBER) ||
 439                                 (val < 0) ||
 440                                 (val > BLOBMSG_TYPE_LAST)) {
 441                         lua_pop(L, 1);
 442                         continue;
 443                 }
 444                 p[pidx].name = lua_tostring(L, -2);
 445                 p[pidx].type = val;
 446                 lua_pop(L, 1);
 447                 pidx++;
 448         }
 449
 450         m->n_policy = pidx;
 451         lua_pop(L, 2);
 452
 453         return 0;
 454 }
 455
 456 static void
 457 ubus_new_sub_cb(struct ubus_context *ctx, struct ubus_object *obj)
 458 {
 459         struct ubus_lua_object *luobj;
 460
 461         luobj = container_of(obj, struct ubus_lua_object, o);
 462
 463         lua_getglobal(state, "__ubus_cb_publisher");
 464         lua_rawgeti(state, -1, luobj->rsubscriber);
 465         lua_remove(state, -2);
 466
 467         if (lua_isfunction(state, -1)) {
 468                 lua_pushnumber(state, luobj->o.has_subscribers );
 469                 lua_call(state, 1, 0);
 470         } else {
 471                 lua_pop(state, 1);
 472         }
 473 }
 474
 475 static void
 476 ubus_lua_load_newsub_cb( lua_State *L, struct ubus_lua_object *obj )
 477 {
 478         /* keep ref to func */
 479         lua_getglobal(L, "__ubus_cb_publisher");
 480         lua_pushvalue(L, -2);
 481         obj->rsubscriber = luaL_ref(L, -2);
 482         lua_pop(L, 1);
 483
 484         /* real callback */
 485         obj->o.subscribe_cb = ubus_new_sub_cb;
 486         return;
 487 }
 488
 489 static struct ubus_object* ubus_lua_load_object(lua_State *L)
 490 {
 491         struct ubus_lua_object *obj = NULL;
 492         int mlen = lua_gettablelen(L, -1);
 493         struct ubus_method *m;
 494         int midx = 0;
 495
 496         /* setup object pointers */
 497         obj = calloc(1, sizeof(struct ubus_lua_object));
 498         if (!obj)
 499                 return NULL;
 500
 501         obj->o.name = lua_tostring(L, -2);
 502
 503         /* setup method pointers */
 504         m = calloc(mlen, sizeof(struct ubus_method));
 505         obj->o.methods = m;
 506
 507         /* setup type pointers */
 508         obj->o.type = calloc(1, sizeof(struct ubus_object_type));
 509         if (!obj->o.type) {
 510                 free(obj);
 511                 return NULL;
 512         }
 513
 514         obj->o.type->name = lua_tostring(L, -2);
 515         obj->o.type->id = 0;
 516         obj->o.type->methods = obj->o.methods;
 517
 518         /* create the callback lookup table */
 519         lua_createtable(L, 1, 0);
 520         lua_getglobal(L, "__ubus_cb");
 521         lua_pushvalue(L, -2);
 522         obj->r = luaL_ref(L, -2);
 523         lua_pop(L, 1);
 524
 525         /* scan each method */
 526         lua_pushnil(L);
 527         while (lua_next(L, -3) != 0) {
 528                 /* check if its the subscriber notification callback */
 529                 if( lua_type( L, -2 ) == LUA_TSTRING &&
 530                                 lua_type( L, -1 ) == LUA_TFUNCTION ){
 531                   if( !strcmp( lua_tostring( L, -2 ), "__subscriber_cb" ) )
 532                           ubus_lua_load_newsub_cb( L, obj );
 533                 }
 534
 535                 /* check if it looks like a method */
 536                 if ((lua_type(L, -2) != LUA_TSTRING) ||
 537                                 (lua_type(L, -1) != LUA_TTABLE) ||
 538                                 !lua_objlen(L, -1)) {
 539                         lua_pop(L, 1);
 540                         continue;
 541                 }
 542
 543                 if (!ubus_lua_load_methods(L, &m[midx]))
 544                         midx++;
 545                 lua_pop(L, 1);
 546         }
 547
 548         obj->o.type->n_methods = obj->o.n_methods = midx;
 549
 550         /* pop the callback table */
 551         lua_pop(L, 1);
 552
 553         return &obj->o;
 554 }
 555
 556 static int ubus_lua_add(lua_State *L)
 557 {
 558         struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
 559
 560         /* verify top level object */
 561         if (lua_istable(L, 1)) {
 562                 lua_pushstring(L, "you need to pass a table");
 563                 return lua_error(L);
 564         }
 565
 566         /* scan each object */
 567         lua_pushnil(L);
 568         while (lua_next(L, -2) != 0) {
 569                 struct ubus_object *obj = NULL;
 570
 571                 /* check if the object has a table of methods */
 572                 if ((lua_type(L, -2) == LUA_TSTRING) && (lua_type(L, -1) == LUA_TTABLE)) {
 573                         obj = ubus_lua_load_object(L);
 574
 575                         if (obj){
 576                                 ubus_add_object(c->ctx, obj);
 577
 578                                 /* allow future reference of ubus obj */
 579                                 lua_pushstring(state,"__ubusobj");
 580                                 lua_pushlightuserdata(state, obj);
 581                                 lua_settable(state,-3);
 582                         }
 583                 }
 584                 lua_pop(L, 1);
 585         }
 586
 587         return 0;
 588 }
 589
 590 static int
 591 ubus_lua_notify( lua_State *L )
 592 {
 593         struct ubus_lua_connection *c;
 594         struct ubus_object *obj;
 595         const char* method;
 596
 597         c = luaL_checkudata(L, 1, METANAME);
 598         method = luaL_checkstring(L, 3);
 599         luaL_checktype(L, 4, LUA_TTABLE);
 600
 601         if( !lua_islightuserdata( L, 2 ) ){
 602                 lua_pushfstring( L, "Invald 2nd parameter, expected ubus obj ref" );
 603                 return lua_error( L );
 604         }
 605         obj = lua_touserdata( L, 2 );
 606
 607         /* create parameters from table */
 608         blob_buf_init(&c->buf, 0);
 609         if( !ubus_lua_format_blob_array( L, &c->buf, true ) ){
 610                 lua_pushfstring( L, "Invalid 4th parameter, expected table of arguments" );
 611                 return lua_error( L );
 612         }
 613
 614         ubus_notify( c->ctx, obj, method, c->buf.head, -1 );
 615         return 0;
 616 }
 617
 618 static void
 619 ubus_lua_signatures_cb(struct ubus_context *c, struct ubus_object_data *o, void *p)
 620 {
 621         lua_State *L = (lua_State *)p;
 622
 623         if (!o->signature)
 624                 return;
 625
 626         ubus_lua_parse_blob_array(L, blob_data(o->signature), blob_len(o->signature), true);
 627 }
 628
 629 static int
 630 ubus_lua_signatures(lua_State *L)
 631 {
 632         int rv;
 633         struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
 634         const char *path = luaL_checkstring(L, 2);
 635
 636         rv = ubus_lookup(c->ctx, path, ubus_lua_signatures_cb, L);
 637
 638         if (rv != UBUS_STATUS_OK)
 639         {
 640                 lua_pop(L, 1);
 641                 lua_pushnil(L);
 642                 lua_pushinteger(L, rv);
 643                 return 2;
 644         }
 645
 646         return 1;
 647 }
 648
 649
 650 static void
 651 ubus_lua_call_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 652 {
 653         lua_State *L = (lua_State *)req->priv;
 654
 655         if (!msg && L)
 656                 lua_pushnil(L);
 657
 658         if (msg && L)
 659                 ubus_lua_parse_blob_array(L, blob_data(msg), blob_len(msg), true);
 660 }
 661
 662 static int
 663 ubus_lua_call(lua_State *L)
 664 {
 665         int rv, top;
 666         uint32_t id;
 667         struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
 668         const char *path = luaL_checkstring(L, 2);
 669         const char *func = luaL_checkstring(L, 3);
 670
 671         luaL_checktype(L, 4, LUA_TTABLE);
 672         blob_buf_init(&c->buf, 0);
 673
 674         if (!ubus_lua_format_blob_array(L, &c->buf, true))
 675         {
 676                 lua_pushnil(L);
 677                 lua_pushinteger(L, UBUS_STATUS_INVALID_ARGUMENT);
 678                 return 2;
 679         }
 680
 681         rv = ubus_lookup_id(c->ctx, path, &id);
 682
 683         if (rv)
 684         {
 685                 lua_pushnil(L);
 686                 lua_pushinteger(L, rv);
 687                 return 2;
 688         }
 689
 690         top = lua_gettop(L);
 691         rv = ubus_invoke(c->ctx, id, func, c->buf.head, ubus_lua_call_cb, L, c->timeout * 1000);
 692
 693         if (rv != UBUS_STATUS_OK)
 694         {
 695                 lua_pop(L, 1);
 696                 lua_pushnil(L);
 697                 lua_pushinteger(L, rv);
 698                 return 2;
 699         }
 700
 701         return lua_gettop(L) - top;
 702 }
 703
 704 static void
 705 ubus_event_handler(struct ubus_context *ctx, struct ubus_event_handler *ev,
 706                         const char *type, struct blob_attr *msg)
 707 {
 708         struct ubus_lua_event *listener = container_of(ev, struct ubus_lua_event, e);
 709
 710         lua_getglobal(state, "__ubus_cb_event");
 711         lua_rawgeti(state, -1, listener->r);
 712         lua_remove(state, -2);
 713
 714         if (lua_isfunction(state, -1)) {
 715                 ubus_lua_parse_blob_array(state, blob_data(msg), blob_len(msg), true);
 716                 lua_call(state, 1, 0);
 717         } else {
 718                 lua_pop(state, 1);
 719         }
 720 }
 721
 722 static struct ubus_event_handler*
 723 ubus_lua_load_event(lua_State *L)
 724 {
 725         struct ubus_lua_event* event = NULL;
 726
 727         event = calloc(1, sizeof(struct ubus_lua_event));
 728         if (!event)
 729                 return NULL;
 730
 731         event->e.cb = ubus_event_handler;
 732
 733         /* update the he callback lookup table */
 734         lua_getglobal(L, "__ubus_cb_event");
 735         lua_pushvalue(L, -2);
 736         event->r = luaL_ref(L, -2);
 737         lua_setfield(L, -1, lua_tostring(L, -3));
 738
 739         return &event->e;
 740 }
 741
 742 static int
 743 ubus_lua_listen(lua_State *L) {
 744         struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
 745
 746         /* verify top level object */
 747         luaL_checktype(L, 2, LUA_TTABLE);
 748
 749         /* scan each object */
 750         lua_pushnil(L);
 751         while (lua_next(L, -2) != 0) {
 752                 struct ubus_event_handler *listener;
 753
 754                 /* check if the key is a string and the value is a method */
 755                 if ((lua_type(L, -2) == LUA_TSTRING) && (lua_type(L, -1) == LUA_TFUNCTION)) {
 756                         listener = ubus_lua_load_event(L);
 757                         if(listener != NULL) {
 758                                 ubus_register_event_handler(c->ctx, listener, lua_tostring(L, -2));
 759                         }
 760                 }
 761                 lua_pop(L, 1);
 762         }
 763         return 0;
 764 }
 765
 766 static void
 767 ubus_sub_remove_handler(struct ubus_context *ctx, struct ubus_subscriber *s,
 768                             uint32_t id)
 769 {
 770         struct ubus_lua_subscriber *sub;
 771
 772         sub = container_of(s, struct ubus_lua_subscriber, s);
 773
 774         lua_getglobal(state, "__ubus_cb_subscribe");
 775         lua_rawgeti(state, -1, sub->rremove);
 776         lua_remove(state, -2);
 777
 778         if (lua_isfunction(state, -1)) {
 779                 lua_call(state, 0, 0);
 780         } else {
 781                 lua_pop(state, 1);
 782         }
 783 }
 784
 785 static int
 786 ubus_sub_notify_handler(struct ubus_context *ctx, struct ubus_object *obj,
 787             struct ubus_request_data *req, const char *method,
 788             struct blob_attr *msg)
 789 {
 790         struct ubus_subscriber *s;
 791         struct ubus_lua_subscriber *sub;
 792
 793         s = container_of(obj, struct ubus_subscriber, obj);
 794         sub = container_of(s, struct ubus_lua_subscriber, s);
 795
 796         lua_getglobal(state, "__ubus_cb_subscribe");
 797         lua_rawgeti(state, -1, sub->rnotify);
 798         lua_remove(state, -2);
 799
 800         if (lua_isfunction(state, -1)) {
 801                 if( msg ){
 802                         ubus_lua_parse_blob_array(state, blob_data(msg), blob_len(msg), true);
 803                 } else {
 804                         lua_pushnil(state);
 805                 }
 806                 lua_pushstring(state, method);
 807                 lua_call(state, 2, 0);
 808         } else {
 809                 lua_pop(state, 1);
 810         }
 811
 812         return 0;
 813 }
 814
 815
 816
 817 static int
 818 ubus_lua_do_subscribe( struct ubus_context *ctx, lua_State *L, const char* target,
 819                         int idxnotify, int idxremove )
 820 {
 821         uint32_t id;
 822         int status;
 823         struct ubus_lua_subscriber *sub;
 824
 825         if( ( status = ubus_lookup_id( ctx, target, &id ) ) ){
 826                 lua_pushfstring( L, "Unable find target, status=%d", status );
 827                 return lua_error( L );
 828         }
 829
 830         sub = calloc( 1, sizeof( struct ubus_lua_subscriber ) );
 831         if( !sub ){
 832                 lua_pushstring( L, "Out of memory" );
 833                 return lua_error( L );
 834         }
 835
 836         if( idxnotify ){
 837                 lua_getglobal(L, "__ubus_cb_subscribe");
 838                 lua_pushvalue(L, idxnotify);
 839                 sub->rnotify = luaL_ref(L, -2);
 840                 lua_pop(L, 1);
 841                 sub->s.cb = ubus_sub_notify_handler;
 842         }
 843
 844         if( idxremove ){
 845                 lua_getglobal(L, "__ubus_cb_subscribe");
 846                 lua_pushvalue(L, idxremove);
 847                 sub->rremove = luaL_ref(L, -2);
 848                 lua_pop(L, 1);
 849                 sub->s.remove_cb = ubus_sub_remove_handler;
 850         }
 851
 852         if( ( status = ubus_register_subscriber( ctx, &sub->s ) ) ){
 853                 lua_pushfstring( L, "Failed to register subscriber, status=%d", status );
 854                 return lua_error( L );
 855         }
 856
 857         if( ( status = ubus_subscribe( ctx, &sub->s, id) ) ){
 858                 lua_pushfstring( L, "Failed to register subscriber, status=%d", status );
 859                 return lua_error( L );
 860         }
 861
 862         return 0;
 863 }
 864
 865 static int
 866 ubus_lua_subscribe(lua_State *L) {
 867         int idxnotify, idxremove, stackstart;
 868         struct ubus_lua_connection *c;
 869         const char* target;
 870
 871         idxnotify = idxremove = 0;
 872         stackstart = lua_gettop( L );
 873
 874
 875         c = luaL_checkudata(L, 1, METANAME);
 876         target = luaL_checkstring(L, 2);
 877         luaL_checktype(L, 3, LUA_TTABLE);
 878
 879
 880         lua_pushstring( L, "notify");
 881         lua_gettable( L, 3 );
 882         if( lua_type( L, -1 ) == LUA_TFUNCTION ){
 883                 idxnotify = lua_gettop( L );
 884         } else {
 885                 lua_pop( L, 1 );
 886         }
 887
 888         lua_pushstring( L, "remove");
 889         lua_gettable( L, 3 );
 890         if( lua_type( L, -1 ) == LUA_TFUNCTION ){
 891                 idxremove = lua_gettop( L );
 892         } else {
 893                 lua_pop( L, 1 );
 894         }
 895
 896         if( idxnotify )
 897                 ubus_lua_do_subscribe( c->ctx, L, target, idxnotify, idxremove );
 898
 899         if( lua_gettop( L ) > stackstart )
 900                 lua_pop( L, lua_gettop( L ) - stackstart );
 901
 902         return 0;
 903 }
 904
 905 static int
 906 ubus_lua_send(lua_State *L)
 907 {
 908         struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
 909         const char *event = luaL_checkstring(L, 2);
 910
 911         if (*event == 0)
 912                 return luaL_argerror(L, 2, "no event name");
 913
 914         // Event content convert to ubus form
 915         luaL_checktype(L, 3, LUA_TTABLE);
 916         blob_buf_init(&c->buf, 0);
 917
 918         if (!ubus_lua_format_blob_array(L, &c->buf, true)) {
 919                 lua_pushnil(L);
 920                 lua_pushinteger(L, UBUS_STATUS_INVALID_ARGUMENT);
 921                 return 2;
 922         }
 923
 924         // Send the event
 925         ubus_send_event(c->ctx, event, c->buf.head);
 926
 927         return 0;
 928 }
 929
 930
 931
 932 static int
 933 ubus_lua__gc(lua_State *L)
 934 {
 935         struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
 936
 937         blob_buf_free(&c->buf);
 938         if (c->ctx != NULL)
 939         {
 940                 ubus_free(c->ctx);
 941                 memset(c, 0, sizeof(*c));
 942         }
 943
 944         return 0;
 945 }
 946
 947 static const luaL_Reg ubus[] = {
 948         { "connect", ubus_lua_connect },
 949         { "objects", ubus_lua_objects },
 950         { "add", ubus_lua_add },
 951         { "notify", ubus_lua_notify },
 952         { "reply", ubus_lua_reply },
 953         { "defer_request", ubus_lua_defer_request },
 954         { "complete_deferred_request", ubus_lua_complete_deferred_request },
 955         { "signatures", ubus_lua_signatures },
 956         { "call", ubus_lua_call },
 957         { "close", ubus_lua__gc },
 958         { "listen", ubus_lua_listen },
 959         { "send", ubus_lua_send },
 960         { "subscribe", ubus_lua_subscribe },
 961         { "__gc", ubus_lua__gc },
 962         { NULL, NULL },
 963 };
 964
 965 /* avoid missing prototype warning */
 966 int luaopen_ubus(lua_State *L);
 967
 968 int
 969 luaopen_ubus(lua_State *L)
 970 {
 971         /* create metatable */
 972         luaL_newmetatable(L, METANAME);
 973
 974         /* metatable.__index = metatable */
 975         lua_pushvalue(L, -1);
 976         lua_setfield(L, -2, "__index");
 977
 978         /* fill metatable */
 979         luaL_register(L, NULL, ubus);
 980         lua_pop(L, 1);
 981
 982         /* create module */
 983         luaL_register(L, MODNAME, ubus);
 984
 985         /* set some enum defines */
 986         lua_pushinteger(L, BLOBMSG_TYPE_ARRAY);
 987         lua_setfield(L, -2, "ARRAY");
 988         lua_pushinteger(L, BLOBMSG_TYPE_TABLE);
 989         lua_setfield(L, -2, "TABLE");
 990         lua_pushinteger(L, BLOBMSG_TYPE_STRING);
 991         lua_setfield(L, -2, "STRING");
 992         lua_pushinteger(L, BLOBMSG_TYPE_INT64);
 993         lua_setfield(L, -2, "INT64");
 994         lua_pushinteger(L, BLOBMSG_TYPE_INT32);
 995         lua_setfield(L, -2, "INT32");
 996         lua_pushinteger(L, BLOBMSG_TYPE_INT16);
 997         lua_setfield(L, -2, "INT16");
 998         lua_pushinteger(L, BLOBMSG_TYPE_INT8);
 999         lua_setfield(L, -2, "INT8");
1000         lua_pushinteger(L, BLOBMSG_TYPE_DOUBLE);
1001         lua_setfield(L, -2, "DOUBLE");
1002         lua_pushinteger(L, BLOBMSG_TYPE_BOOL);
1003         lua_setfield(L, -2, "BOOLEAN");
1004
1005         /* used in our callbacks */
1006         state = L;
1007
1008         /* create the callback table */
1009         lua_createtable(L, 1, 0);
1010         lua_setglobal(L, "__ubus_cb");
1011
1012         /* create the event table */
1013         lua_createtable(L, 1, 0);
1014         lua_setglobal(L, "__ubus_cb_event");
1015
1016         /* create the subscriber table */
1017         lua_createtable(L, 1, 0);
1018         lua_setglobal(L, "__ubus_cb_subscribe");
1019
1020         /* create the publisher table - notifications of new subs */
1021         lua_createtable(L, 1, 0);
1022         lua_setglobal(L, "__ubus_cb_publisher");
1023         return 0;
1024 }