lua/uci.c

   1 /*
   2  * libuci plugin for Lua
   3  * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   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 <sys/types.h>
  16 #include <sys/time.h>
  17 #include <stdbool.h>
  18 #include <stdlib.h>
  19 #include <string.h>
  20 #include <unistd.h>
  21 #include <stdio.h>
  22 #include <errno.h>
  23
  24 #include <lauxlib.h>
  25 #include <uci.h>
  26
  27 #define MODNAME        "uci"
  28 //#define DEBUG 1
  29
  30 #ifdef DEBUG
  31 #define DPRINTF(...) fprintf(stderr, __VA_ARGS__)
  32 #else
  33 #define DPRINTF(...) do {} while (0)
  34 #endif
  35
  36 static struct uci_context *ctx = NULL;
  37
  38 static struct uci_package *
  39 find_package(lua_State *L, const char *name, bool autoload)
  40 {
  41         struct uci_package *p = NULL;
  42         struct uci_element *e;
  43
  44         uci_foreach_element(&ctx->root, e) {
  45                 if (strcmp(e->name, name) != 0)
  46                         continue;
  47
  48                 p = uci_to_package(e);
  49                 goto done;
  50         }
  51
  52         if (autoload) {
  53                 do {
  54                         lua_getfield(L, LUA_GLOBALSINDEX, "uci");
  55                         lua_getfield(L, -1, "autoload");
  56                         if (!lua_isboolean(L, -1))
  57                                 break;
  58
  59                         if (!lua_toboolean(L, -1))
  60                                 break;
  61
  62                         uci_load(ctx, name, &p);
  63                 } while (0);
  64                 lua_pop(L, 2);
  65         }
  66
  67 done:
  68         return p;
  69 }
  70
  71 static void uci_lua_perror(lua_State *L, char *name)
  72 {
  73         lua_getfield(L, LUA_GLOBALSINDEX, "uci");
  74         lua_getfield(L, -1, "warn");
  75         if (!lua_isboolean(L, -1))
  76                 goto done;
  77         if (lua_toboolean(L, -1) != 1)
  78                 goto done;
  79         uci_perror(ctx, name);
  80 done:
  81         lua_pop(L, 2);
  82 }
  83
  84 static void uci_push_section(lua_State *L, struct uci_section *s)
  85 {
  86         struct uci_element *e;
  87
  88         lua_newtable(L);
  89         lua_pushstring(L, s->type);
  90         lua_setfield(L, -2, "type");
  91         lua_pushstring(L, s->e.name);
  92         lua_setfield(L, -2, "name");
  93
  94         lua_newtable(L);
  95         lua_pushvalue(L, -1);
  96         lua_setfield(L, -3, "options");
  97
  98         uci_foreach_element(&s->options, e) {
  99                 struct uci_option *o = uci_to_option(e);
 100                 lua_pushstring(L, o->value);
 101                 lua_setfield(L, -2, o->e.name);
 102         }
 103         lua_pop(L, 1);
 104 }
 105
 106 static void uci_push_package(lua_State *L, struct uci_package *p)
 107 {
 108         struct uci_element *e;
 109         int i = 0;
 110
 111         lua_newtable(L);
 112         uci_foreach_element(&p->sections, e) {
 113                 i++;
 114                 luaL_setn(L, -1, i);
 115                 uci_push_section(L, uci_to_section(e));
 116                 lua_rawseti(L, -2, i);
 117         }
 118 }
 119
 120 static int
 121 uci_lua_unload(lua_State *L)
 122 {
 123         struct uci_package *p;
 124         const char *s;
 125
 126         luaL_checkstring(L, 1);
 127         s = lua_tostring(L, -1);
 128         p = find_package(L, s, false);
 129         if (p) {
 130                 uci_unload(ctx, p);
 131                 lua_pushboolean(L, 1);
 132         } else {
 133                 lua_pushboolean(L, 0);
 134         }
 135         return 1;
 136 }
 137
 138 static int
 139 uci_lua_load(lua_State *L)
 140 {
 141         struct uci_package *p = NULL;
 142         const char *s;
 143
 144         uci_lua_unload(L);
 145         lua_pop(L, 1); /* bool ret value of unload */
 146         s = lua_tostring(L, -1);
 147
 148         if (uci_load(ctx, s, &p)) {
 149                 uci_lua_perror(L, "uci.load");
 150                 lua_pushboolean(L, 0);
 151         } else {
 152                 lua_pushboolean(L, 1);
 153         }
 154
 155         return 1;
 156 }
 157
 158
 159 static int
 160 uci_lua_foreach(lua_State *L)
 161 {
 162         struct uci_package *p;
 163         struct uci_element *e;
 164         const char *package, *type;
 165         bool ret = false;
 166
 167         package = luaL_checkstring(L, 1);
 168
 169         if (lua_isnil(L, 2))
 170                 type = NULL;
 171         else
 172                 type = luaL_checkstring(L, 2);
 173
 174         if (!lua_isfunction(L, 3) || !package)
 175                 luaL_error(L, "Invalid argument");
 176
 177         p = find_package(L, package, true);
 178         if (!p)
 179                 goto done;
 180
 181         uci_foreach_element(&p->sections, e) {
 182                 struct uci_section *s = uci_to_section(e);
 183
 184                 if (type && (strcmp(s->type, type) != 0))
 185                         continue;
 186
 187                 lua_pushvalue(L, 3); /* iterator function */
 188                 uci_push_section(L, s);
 189                 if (lua_pcall(L, 1, 0, 0) == 0)
 190                         ret = true;
 191         }
 192
 193 done:
 194         lua_pushboolean(L, ret);
 195         return 1;
 196 }
 197
 198 static int
 199 uci_lua_get_any(lua_State *L, bool all)
 200 {
 201         struct uci_element *e = NULL;
 202         struct uci_package *p = NULL;
 203         const char *package = NULL;
 204         const char *section = NULL;
 205         const char *option = NULL;
 206         char *s;
 207         int err = UCI_ERR_MEM;
 208         int n;
 209
 210         n = lua_gettop(L);
 211
 212         luaL_checkstring(L, 1);
 213         s = strdup(lua_tostring(L, 1));
 214         if (!s)
 215                 goto error;
 216
 217         if (n > 1) {
 218                 package = luaL_checkstring(L, 1);
 219                 section = luaL_checkstring(L, 2);
 220                 if (n > 2)
 221                         option = luaL_checkstring(L, 3);
 222         } else {
 223                 if ((err = uci_parse_tuple(ctx, s, (char **) &package, (char **) &section, (char **) &option, NULL)))
 224                         goto error;
 225         }
 226
 227         if (!all && (section == NULL)) {
 228                 err = UCI_ERR_INVAL;
 229                 goto error;
 230         }
 231
 232         p = find_package(L, package, true);
 233         if (!p) {
 234                 err = UCI_ERR_NOTFOUND;
 235                 goto error;
 236         }
 237
 238         if (section) {
 239                 if ((err = uci_lookup(ctx, &e, p, section, option)))
 240                         goto error;
 241         } else {
 242                 e = &p->e;
 243         }
 244
 245         switch(e->type) {
 246                 case UCI_TYPE_PACKAGE:
 247                         uci_push_package(L, p);
 248                         break;
 249                 case UCI_TYPE_SECTION:
 250                         if (all)
 251                                 uci_push_section(L, uci_to_section(e));
 252                         else
 253                                 lua_pushstring(L, uci_to_section(e)->type);
 254                         break;
 255                 case UCI_TYPE_OPTION:
 256                         lua_pushstring(L, uci_to_option(e)->value);
 257                         break;
 258                 default:
 259                         err = UCI_ERR_INVAL;
 260                         goto error;
 261         }
 262 error:
 263         if (s)
 264                 free(s);
 265
 266         switch(err) {
 267         default:
 268                 ctx->err = err;
 269                 uci_lua_perror(L, "uci.get");
 270                 /* fall through */
 271         case UCI_ERR_NOTFOUND:
 272                 lua_pushnil(L);
 273                 /* fall through */
 274         case 0:
 275                 return 1;
 276         }
 277 }
 278
 279 static int
 280 uci_lua_get(lua_State *L)
 281 {
 282         return uci_lua_get_any(L, false);
 283 }
 284
 285 static int
 286 uci_lua_get_all(lua_State *L)
 287 {
 288         return uci_lua_get_any(L, true);
 289 }
 290
 291 static int
 292 uci_lua_add(lua_State *L)
 293 {
 294         struct uci_section *s = NULL;
 295         struct uci_package *p;
 296         const char *package;
 297         const char *type;
 298         const char *name = NULL;
 299
 300         do {
 301                 package = luaL_checkstring(L, 1);
 302                 type = luaL_checkstring(L, 2);
 303                 p = find_package(L, package, true);
 304                 if (!p)
 305                         break;
 306
 307                 if (uci_add_section(ctx, p, type, &s) || !s)
 308                         break;
 309
 310                 name = s->e.name;
 311         } while (0);
 312
 313         lua_pushstring(L, name);
 314         return 1;
 315 }
 316
 317 static int
 318 uci_lua_set(lua_State *L)
 319 {
 320         struct uci_package *p;
 321         const char *package = NULL;
 322         const char *section = NULL;
 323         const char *option = NULL;
 324         const char *value = NULL;
 325         const char *s;
 326         int err = UCI_ERR_MEM;
 327         int nargs;
 328
 329         nargs = lua_gettop(L);
 330
 331         s = luaL_checkstring(L, 1);
 332         switch(nargs) {
 333         case 1:
 334                 /* Format: uci.set("p.s.o=v") or uci.set("p.s=v") */
 335                 s = strdup(s);
 336                 if (!s)
 337                         goto error;
 338
 339                 if ((err = uci_parse_tuple(ctx, (char *) s, (char **) &package, (char **) &section, (char **) &option, (char **) &value)))
 340                         goto error;
 341                 break;
 342         case 4:
 343                 /* Format: uci.set("p", "s", "o", "v") */
 344                 option = luaL_checkstring(L, 3);
 345                 /* fall through */
 346         case 3:
 347                 /* Format: uci.set("p", "s", "v") */
 348                 package = s;
 349                 section = luaL_checkstring(L, 2);
 350                 value = luaL_checkstring(L, nargs);
 351                 break;
 352         default:
 353                 err = UCI_ERR_INVAL;
 354                 goto error;
 355         }
 356
 357         if ((section == NULL) || (value == NULL)) {
 358                 err = UCI_ERR_INVAL;
 359                 goto error;
 360         }
 361
 362         p = find_package(L, package, true);
 363         if (!p) {
 364                 err = UCI_ERR_NOTFOUND;
 365                 goto error;
 366         }
 367         err = uci_set(ctx, p, section, option, value, NULL);
 368
 369 error:
 370         if (err)
 371                 uci_lua_perror(L, "uci.set");
 372         lua_pushboolean(L, (err == 0));
 373         return 1;
 374 }
 375
 376 enum pkg_cmd {
 377         CMD_SAVE,
 378         CMD_COMMIT,
 379         CMD_REVERT
 380 };
 381
 382 static int
 383 uci_lua_package_cmd(lua_State *L, enum pkg_cmd cmd)
 384 {
 385         struct uci_element *e, *tmp;
 386         const char *s = NULL;
 387         const char *section = NULL;
 388         const char *option = NULL;
 389         int failed = 0;
 390         int nargs;
 391
 392         nargs = lua_gettop(L);
 393         switch(nargs) {
 394         case 3:
 395                 if (cmd != CMD_REVERT)
 396                         goto err;
 397                 luaL_checkstring(L, 1);
 398                 option = lua_tostring(L, -1);
 399                 lua_pop(L, 1);
 400                 /* fall through */
 401         case 2:
 402                 if (cmd != CMD_REVERT)
 403                         goto err;
 404                 luaL_checkstring(L, 1);
 405                 section = lua_tostring(L, -1);
 406                 lua_pop(L, 1);
 407                 /* fall through */
 408         case 1:
 409                 luaL_checkstring(L, 1);
 410                 s = lua_tostring(L, -1);
 411                 lua_pop(L, 1);
 412                 break;
 413         case 0:
 414                 break;
 415         default:
 416                 err:
 417                 luaL_error(L, "Invalid argument count");
 418                 break;
 419         }
 420
 421         uci_foreach_element_safe(&ctx->root, tmp, e) {
 422                 struct uci_package *p = uci_to_package(e);
 423                 int ret = UCI_ERR_INVAL;
 424
 425                 if (s && (strcmp(s, e->name) != 0))
 426                         continue;
 427
 428                 switch(cmd) {
 429                 case CMD_COMMIT:
 430                         ret = uci_commit(ctx, &p, false);
 431                         break;
 432                 case CMD_SAVE:
 433                         ret = uci_save(ctx, p);
 434                         break;
 435                 case CMD_REVERT:
 436                         ret = uci_revert(ctx, &p, section, option);
 437                         break;
 438                 }
 439
 440                 if (ret != 0)
 441                         failed = 1;
 442         }
 443
 444         lua_pushboolean(L, !failed);
 445         return 1;
 446 }
 447
 448 static int
 449 uci_lua_save(lua_State *L)
 450 {
 451         return uci_lua_package_cmd(L, CMD_SAVE);
 452 }
 453
 454 static int
 455 uci_lua_commit(lua_State *L)
 456 {
 457         return uci_lua_package_cmd(L, CMD_COMMIT);
 458 }
 459
 460 static int
 461 uci_lua_revert(lua_State *L)
 462 {
 463         return uci_lua_package_cmd(L, CMD_REVERT);
 464 }
 465
 466 static int
 467 uci_lua_set_confdir(lua_State *L)
 468 {
 469         int ret;
 470
 471         luaL_checkstring(L, 1);
 472         ret = uci_set_confdir(ctx, lua_tostring(L, -1));
 473         lua_pushboolean(L, (ret == 0));
 474         return 1;
 475 }
 476
 477 static int
 478 uci_lua_set_savedir(lua_State *L)
 479 {
 480         int ret;
 481
 482         luaL_checkstring(L, 1);
 483         ret = uci_set_savedir(ctx, lua_tostring(L, -1));
 484         lua_pushboolean(L, (ret == 0));
 485
 486         return 1;
 487 }
 488
 489 static const luaL_Reg uci[] = {
 490         { "load", uci_lua_load },
 491         { "unload", uci_lua_unload },
 492         { "get", uci_lua_get },
 493         { "get_all", uci_lua_get_all },
 494         { "add", uci_lua_add },
 495         { "set", uci_lua_set },
 496         { "save", uci_lua_save },
 497         { "commit", uci_lua_commit },
 498         { "revert", uci_lua_revert },
 499         { "foreach", uci_lua_foreach },
 500         { "set_confdir", uci_lua_set_confdir },
 501         { "set_savedir", uci_lua_set_savedir },
 502         { NULL, NULL },
 503 };
 504
 505
 506 int
 507 luaopen_uci(lua_State *L)
 508 {
 509         ctx = uci_alloc_context();
 510         if (!ctx)
 511                 luaL_error(L, "Cannot allocate UCI context\n");
 512         luaL_register(L, MODNAME, uci);
 513
 514         /* enable autoload by default */
 515         lua_getfield(L, LUA_GLOBALSINDEX, "uci");
 516         lua_pushboolean(L, 1);
 517         lua_setfield(L, -2, "autoload");
 518         lua_pop(L, 1);
 519
 520         return 0;
 521 }