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(const char *name)
  40 {
  41         struct uci_package *p = NULL;
  42         struct uci_element *e;
  43         uci_foreach_element(&ctx->root, e) {
  44                 if (strcmp(e->name, name) != 0)
  45                         continue;
  46
  47                 p = uci_to_package(e);
  48                 break;
  49         }
  50         return p;
  51 }
  52
  53 static void uci_lua_perror(lua_State *L, char *name)
  54 {
  55         lua_getfield(L, LUA_GLOBALSINDEX, "uci");
  56         lua_getfield(L, -1, "warn");
  57         if (!lua_isboolean(L, -1))
  58                 goto done;
  59         if (lua_toboolean(L, -1) != 1)
  60                 goto done;
  61         uci_perror(ctx, name);
  62 done:
  63         lua_pop(L, 2);
  64 }
  65
  66 static void uci_push_section(lua_State *L, struct uci_section *s)
  67 {
  68         struct uci_element *e;
  69
  70         lua_newtable(L);
  71         lua_pushstring(L, s->type);
  72         lua_setfield(L, -2, "type");
  73         lua_pushstring(L, s->e.name);
  74         lua_setfield(L, -2, "name");
  75
  76         lua_newtable(L);
  77         lua_pushvalue(L, -1);
  78         lua_setfield(L, -3, "options");
  79
  80         uci_foreach_element(&s->options, e) {
  81                 struct uci_option *o = uci_to_option(e);
  82                 lua_pushstring(L, o->value);
  83                 lua_setfield(L, -2, o->e.name);
  84         }
  85         lua_pop(L, 1);
  86 }
  87
  88 static void uci_push_package(lua_State *L, struct uci_package *p)
  89 {
  90         struct uci_element *e;
  91         int i = 0;
  92
  93         lua_newtable(L);
  94         uci_foreach_element(&p->sections, e) {
  95                 i++;
  96                 luaL_setn(L, -1, i);
  97                 uci_push_section(L, uci_to_section(e));
  98                 lua_rawseti(L, -2, i);
  99         }
 100 }
 101
 102 static int
 103 uci_lua_unload(lua_State *L)
 104 {
 105         struct uci_package *p;
 106         const char *s;
 107
 108         luaL_checkstring(L, 1);
 109         s = lua_tostring(L, -1);
 110         p = find_package(s);
 111         if (p) {
 112                 uci_unload(ctx, p);
 113                 lua_pushboolean(L, 1);
 114         } else {
 115                 lua_pushboolean(L, 0);
 116         }
 117         return 1;
 118 }
 119
 120 static int
 121 uci_lua_load(lua_State *L)
 122 {
 123         struct uci_package *p = NULL;
 124         const char *s;
 125
 126         uci_lua_unload(L);
 127         lua_pop(L, 1); /* bool ret value of unload */
 128         s = lua_tostring(L, -1);
 129
 130         if (uci_load(ctx, s, &p)) {
 131                 uci_lua_perror(L, "uci.load");
 132                 lua_pushboolean(L, 0);
 133         } else {
 134                 lua_pushboolean(L, 1);
 135         }
 136
 137         return 1;
 138 }
 139
 140
 141 static int
 142 uci_lua_foreach(lua_State *L)
 143 {
 144         struct uci_package *p;
 145         struct uci_element *e;
 146         const char *package, *type;
 147         bool ret = false;
 148
 149         package = luaL_checkstring(L, 1);
 150
 151         if (lua_isnil(L, 2))
 152                 type = NULL;
 153         else
 154                 type = luaL_checkstring(L, 2);
 155
 156         if (!lua_isfunction(L, 3) || !package)
 157                 luaL_error(L, "Invalid argument");
 158
 159         p = find_package(package);
 160         if (!p)
 161                 goto done;
 162
 163         uci_foreach_element(&p->sections, e) {
 164                 struct uci_section *s = uci_to_section(e);
 165
 166                 if (type && (strcmp(s->type, type) != 0))
 167                         continue;
 168
 169                 lua_pushvalue(L, 3); /* iterator function */
 170                 uci_push_section(L, s);
 171                 if (lua_pcall(L, 1, 0, 0) == 0)
 172                         ret = true;
 173         }
 174
 175 done:
 176         lua_pushboolean(L, ret);
 177         return 1;
 178 }
 179
 180 static int
 181 uci_lua_get_any(lua_State *L, bool all)
 182 {
 183         struct uci_element *e = NULL;
 184         struct uci_package *p = NULL;
 185         char *package = NULL;
 186         char *section = NULL;
 187         char *option = NULL;
 188         char *s;
 189         int err = UCI_ERR_MEM;
 190
 191         luaL_checkstring(L, 1);
 192         s = strdup(lua_tostring(L, -1));
 193         if (!s)
 194                 goto error;
 195
 196         if ((err = uci_parse_tuple(ctx, s, &package, &section, &option, NULL)))
 197                 goto error;
 198
 199         if (!all && (section == NULL)) {
 200                 err = UCI_ERR_INVAL;
 201                 goto error;
 202         }
 203
 204         p = find_package(package);
 205         if (!p) {
 206                 err = UCI_ERR_NOTFOUND;
 207                 goto error;
 208         }
 209
 210         if (section) {
 211                 if ((err = uci_lookup(ctx, &e, p, section, option)))
 212                         goto error;
 213         } else {
 214                 e = &p->e;
 215         }
 216
 217         switch(e->type) {
 218                 case UCI_TYPE_PACKAGE:
 219                         uci_push_package(L, p);
 220                         break;
 221                 case UCI_TYPE_SECTION:
 222                         if (all)
 223                                 uci_push_section(L, uci_to_section(e));
 224                         else
 225                                 lua_pushstring(L, uci_to_section(e)->type);
 226                         break;
 227                 case UCI_TYPE_OPTION:
 228                         lua_pushstring(L, uci_to_option(e)->value);
 229                         break;
 230                 default:
 231                         err = UCI_ERR_INVAL;
 232                         goto error;
 233         }
 234 error:
 235         if (s)
 236                 free(s);
 237
 238         switch(err) {
 239         default:
 240                 ctx->err = err;
 241                 uci_lua_perror(L, "uci.get");
 242                 /* fall through */
 243         case UCI_ERR_NOTFOUND:
 244                 lua_pushnil(L);
 245                 /* fall through */
 246         case 0:
 247                 return 1;
 248         }
 249 }
 250
 251 static int
 252 uci_lua_get(lua_State *L)
 253 {
 254         return uci_lua_get_any(L, false);
 255 }
 256
 257 static int
 258 uci_lua_get_all(lua_State *L)
 259 {
 260         return uci_lua_get_any(L, true);
 261 }
 262
 263 static int
 264 uci_lua_set(lua_State *L)
 265 {
 266         struct uci_package *p;
 267         char *package = NULL;
 268         char *section = NULL;
 269         char *option = NULL;
 270         char *value = NULL;
 271         char *s;
 272         int err = UCI_ERR_MEM;
 273
 274         luaL_checkstring(L, 1);
 275         s = strdup(lua_tostring(L, -1));
 276         if (!s)
 277                 goto error;
 278
 279         if ((err = uci_parse_tuple(ctx, s, &package, &section, &option, &value)))
 280                 goto error;
 281
 282         if ((section == NULL) || (value == NULL)) {
 283                 err = UCI_ERR_INVAL;
 284                 goto error;
 285         }
 286
 287         p = find_package(package);
 288         if (!p) {
 289                 err = UCI_ERR_NOTFOUND;
 290                 goto error;
 291         }
 292         err = uci_set(ctx, p, section, option, value, NULL);
 293
 294 error:
 295         if (err)
 296                 uci_lua_perror(L, "uci.set");
 297         lua_pushboolean(L, (err == 0));
 298         return 1;
 299 }
 300
 301 enum pkg_cmd {
 302         CMD_SAVE,
 303         CMD_COMMIT,
 304         CMD_REVERT
 305 };
 306
 307 static int
 308 uci_lua_package_cmd(lua_State *L, enum pkg_cmd cmd)
 309 {
 310         struct uci_element *e, *tmp;
 311         const char *s = NULL;
 312         const char *section = NULL;
 313         const char *option = NULL;
 314         int failed = 0;
 315         int nargs;
 316
 317         nargs = lua_gettop(L);
 318         switch(nargs) {
 319         case 3:
 320                 if (cmd != CMD_REVERT)
 321                         goto err;
 322                 luaL_checkstring(L, 1);
 323                 option = lua_tostring(L, -1);
 324                 lua_pop(L, 1);
 325                 /* fall through */
 326         case 2:
 327                 if (cmd != CMD_REVERT)
 328                         goto err;
 329                 luaL_checkstring(L, 1);
 330                 section = lua_tostring(L, -1);
 331                 lua_pop(L, 1);
 332                 /* fall through */
 333         case 1:
 334                 luaL_checkstring(L, 1);
 335                 s = lua_tostring(L, -1);
 336                 lua_pop(L, 1);
 337                 break;
 338         default:
 339                 err:
 340                 luaL_error(L, "Invalid argument count");
 341                 break;
 342         }
 343
 344         uci_foreach_element_safe(&ctx->root, tmp, e) {
 345                 struct uci_package *p = uci_to_package(e);
 346                 int ret = UCI_ERR_INVAL;
 347
 348                 if (s && (strcmp(s, e->name) != 0))
 349                         continue;
 350
 351                 switch(cmd) {
 352                 case CMD_COMMIT:
 353                         ret = uci_commit(ctx, &p, false);
 354                         break;
 355                 case CMD_SAVE:
 356                         ret = uci_save(ctx, p);
 357                         break;
 358                 case CMD_REVERT:
 359                         ret = uci_revert(ctx, &p, section, option);
 360                         break;
 361                 }
 362
 363                 if (ret != 0)
 364                         failed = 1;
 365         }
 366
 367         lua_pushboolean(L, !failed);
 368         return 1;
 369 }
 370
 371 static int
 372 uci_lua_save(lua_State *L)
 373 {
 374         return uci_lua_package_cmd(L, CMD_SAVE);
 375 }
 376
 377 static int
 378 uci_lua_commit(lua_State *L)
 379 {
 380         return uci_lua_package_cmd(L, CMD_COMMIT);
 381 }
 382
 383 static int
 384 uci_lua_revert(lua_State *L)
 385 {
 386         return uci_lua_package_cmd(L, CMD_REVERT);
 387 }
 388
 389 static int
 390 uci_lua_set_confdir(lua_State *L)
 391 {
 392         int ret;
 393
 394         luaL_checkstring(L, 1);
 395         ret = uci_set_confdir(ctx, lua_tostring(L, -1));
 396         lua_pushboolean(L, (ret == 0));
 397         return 1;
 398 }
 399
 400 static int
 401 uci_lua_set_savedir(lua_State *L)
 402 {
 403         int ret;
 404
 405         luaL_checkstring(L, 1);
 406         ret = uci_set_savedir(ctx, lua_tostring(L, -1));
 407         lua_pushboolean(L, (ret == 0));
 408
 409         return 1;
 410 }
 411
 412 static const luaL_Reg uci[] = {
 413         { "load", uci_lua_load },
 414         { "unload", uci_lua_unload },
 415         { "get", uci_lua_get },
 416         { "get_all", uci_lua_get_all },
 417         { "set", uci_lua_set },
 418         { "save", uci_lua_save },
 419         { "commit", uci_lua_commit },
 420         { "revert", uci_lua_revert },
 421         { "foreach", uci_lua_foreach },
 422         { "set_confdir", uci_lua_set_confdir },
 423         { "set_savedir", uci_lua_set_savedir },
 424         { NULL, NULL },
 425 };
 426
 427
 428 int
 429 luaopen_uci(lua_State *L)
 430 {
 431         ctx = uci_alloc_context();
 432         if (!ctx)
 433                 luaL_error(L, "Cannot allocate UCI context\n");
 434         luaL_register(L, MODNAME, uci);
 435         return 0;
 436 }