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         const char *package = NULL;
 186         const char *section = NULL;
 187         const char *option = NULL;
 188         char *s;
 189         int err = UCI_ERR_MEM;
 190         int n;
 191
 192         n = lua_gettop(L);
 193
 194         luaL_checkstring(L, 1);
 195         s = strdup(lua_tostring(L, 1));
 196         if (!s)
 197                 goto error;
 198
 199         if (n > 1) {
 200                 package = luaL_checkstring(L, 1);
 201                 section = luaL_checkstring(L, 2);
 202                 if (n > 2)
 203                         option = luaL_checkstring(L, 3);
 204         } else {
 205                 if ((err = uci_parse_tuple(ctx, s, (char **) &package, (char **) &section, (char **) &option, NULL)))
 206                         goto error;
 207         }
 208
 209         if (!all && (section == NULL)) {
 210                 err = UCI_ERR_INVAL;
 211                 goto error;
 212         }
 213
 214         p = find_package(package);
 215         if (!p) {
 216                 err = UCI_ERR_NOTFOUND;
 217                 goto error;
 218         }
 219
 220         if (section) {
 221                 if ((err = uci_lookup(ctx, &e, p, section, option)))
 222                         goto error;
 223         } else {
 224                 e = &p->e;
 225         }
 226
 227         switch(e->type) {
 228                 case UCI_TYPE_PACKAGE:
 229                         uci_push_package(L, p);
 230                         break;
 231                 case UCI_TYPE_SECTION:
 232                         if (all)
 233                                 uci_push_section(L, uci_to_section(e));
 234                         else
 235                                 lua_pushstring(L, uci_to_section(e)->type);
 236                         break;
 237                 case UCI_TYPE_OPTION:
 238                         lua_pushstring(L, uci_to_option(e)->value);
 239                         break;
 240                 default:
 241                         err = UCI_ERR_INVAL;
 242                         goto error;
 243         }
 244 error:
 245         if (s)
 246                 free(s);
 247
 248         switch(err) {
 249         default:
 250                 ctx->err = err;
 251                 uci_lua_perror(L, "uci.get");
 252                 /* fall through */
 253         case UCI_ERR_NOTFOUND:
 254                 lua_pushnil(L);
 255                 /* fall through */
 256         case 0:
 257                 return 1;
 258         }
 259 }
 260
 261 static int
 262 uci_lua_get(lua_State *L)
 263 {
 264         return uci_lua_get_any(L, false);
 265 }
 266
 267 static int
 268 uci_lua_get_all(lua_State *L)
 269 {
 270         return uci_lua_get_any(L, true);
 271 }
 272
 273 static int
 274 uci_lua_set(lua_State *L)
 275 {
 276         struct uci_package *p;
 277         char *package = NULL;
 278         char *section = NULL;
 279         char *option = NULL;
 280         char *value = NULL;
 281         char *s;
 282         int err = UCI_ERR_MEM;
 283
 284         luaL_checkstring(L, 1);
 285         s = strdup(lua_tostring(L, -1));
 286         if (!s)
 287                 goto error;
 288
 289         if ((err = uci_parse_tuple(ctx, s, &package, &section, &option, &value)))
 290                 goto error;
 291
 292         if ((section == NULL) || (value == NULL)) {
 293                 err = UCI_ERR_INVAL;
 294                 goto error;
 295         }
 296
 297         p = find_package(package);
 298         if (!p) {
 299                 err = UCI_ERR_NOTFOUND;
 300                 goto error;
 301         }
 302         err = uci_set(ctx, p, section, option, value, NULL);
 303
 304 error:
 305         if (err)
 306                 uci_lua_perror(L, "uci.set");
 307         lua_pushboolean(L, (err == 0));
 308         return 1;
 309 }
 310
 311 enum pkg_cmd {
 312         CMD_SAVE,
 313         CMD_COMMIT,
 314         CMD_REVERT
 315 };
 316
 317 static int
 318 uci_lua_package_cmd(lua_State *L, enum pkg_cmd cmd)
 319 {
 320         struct uci_element *e, *tmp;
 321         const char *s = NULL;
 322         const char *section = NULL;
 323         const char *option = NULL;
 324         int failed = 0;
 325         int nargs;
 326
 327         nargs = lua_gettop(L);
 328         switch(nargs) {
 329         case 3:
 330                 if (cmd != CMD_REVERT)
 331                         goto err;
 332                 luaL_checkstring(L, 1);
 333                 option = lua_tostring(L, -1);
 334                 lua_pop(L, 1);
 335                 /* fall through */
 336         case 2:
 337                 if (cmd != CMD_REVERT)
 338                         goto err;
 339                 luaL_checkstring(L, 1);
 340                 section = lua_tostring(L, -1);
 341                 lua_pop(L, 1);
 342                 /* fall through */
 343         case 1:
 344                 luaL_checkstring(L, 1);
 345                 s = lua_tostring(L, -1);
 346                 lua_pop(L, 1);
 347                 break;
 348         default:
 349                 err:
 350                 luaL_error(L, "Invalid argument count");
 351                 break;
 352         }
 353
 354         uci_foreach_element_safe(&ctx->root, tmp, e) {
 355                 struct uci_package *p = uci_to_package(e);
 356                 int ret = UCI_ERR_INVAL;
 357
 358                 if (s && (strcmp(s, e->name) != 0))
 359                         continue;
 360
 361                 switch(cmd) {
 362                 case CMD_COMMIT:
 363                         ret = uci_commit(ctx, &p, false);
 364                         break;
 365                 case CMD_SAVE:
 366                         ret = uci_save(ctx, p);
 367                         break;
 368                 case CMD_REVERT:
 369                         ret = uci_revert(ctx, &p, section, option);
 370                         break;
 371                 }
 372
 373                 if (ret != 0)
 374                         failed = 1;
 375         }
 376
 377         lua_pushboolean(L, !failed);
 378         return 1;
 379 }
 380
 381 static int
 382 uci_lua_save(lua_State *L)
 383 {
 384         return uci_lua_package_cmd(L, CMD_SAVE);
 385 }
 386
 387 static int
 388 uci_lua_commit(lua_State *L)
 389 {
 390         return uci_lua_package_cmd(L, CMD_COMMIT);
 391 }
 392
 393 static int
 394 uci_lua_revert(lua_State *L)
 395 {
 396         return uci_lua_package_cmd(L, CMD_REVERT);
 397 }
 398
 399 static int
 400 uci_lua_set_confdir(lua_State *L)
 401 {
 402         int ret;
 403
 404         luaL_checkstring(L, 1);
 405         ret = uci_set_confdir(ctx, lua_tostring(L, -1));
 406         lua_pushboolean(L, (ret == 0));
 407         return 1;
 408 }
 409
 410 static int
 411 uci_lua_set_savedir(lua_State *L)
 412 {
 413         int ret;
 414
 415         luaL_checkstring(L, 1);
 416         ret = uci_set_savedir(ctx, lua_tostring(L, -1));
 417         lua_pushboolean(L, (ret == 0));
 418
 419         return 1;
 420 }
 421
 422 static const luaL_Reg uci[] = {
 423         { "load", uci_lua_load },
 424         { "unload", uci_lua_unload },
 425         { "get", uci_lua_get },
 426         { "get_all", uci_lua_get_all },
 427         { "set", uci_lua_set },
 428         { "save", uci_lua_save },
 429         { "commit", uci_lua_commit },
 430         { "revert", uci_lua_revert },
 431         { "foreach", uci_lua_foreach },
 432         { "set_confdir", uci_lua_set_confdir },
 433         { "set_savedir", uci_lua_set_savedir },
 434         { NULL, NULL },
 435 };
 436
 437
 438 int
 439 luaopen_uci(lua_State *L)
 440 {
 441         ctx = uci_alloc_context();
 442         if (!ctx)
 443                 luaL_error(L, "Cannot allocate UCI context\n");
 444         luaL_register(L, MODNAME, uci);
 445         return 0;
 446 }