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