ucimap.c

   1 /*
   2  * ucimap - library for mapping uci sections into data structures
   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 #include <strings.h>
  15 #include <stdbool.h>
  16 #include <string.h>
  17 #include <stdlib.h>
  18 #include <unistd.h>
  19 #include <limits.h>
  20 #include <ctype.h>
  21 #include "ucimap.h"
  22
  23 struct uci_alloc {
  24         enum ucimap_type type;
  25         union {
  26                 void **ptr;
  27         } data;
  28 };
  29
  30 struct uci_fixup {
  31         struct list_head list;
  32         struct uci_sectionmap *sm;
  33         const char *name;
  34         enum ucimap_type type;
  35         union ucimap_data *data;
  36 };
  37
  38 #define ucimap_foreach_option(_sm, _o) \
  39         if (!(_sm)->options_size) \
  40                 (_sm)->options_size = sizeof(struct uci_optmap); \
  41         for (_o = &(_sm)->options[0]; \
  42                  ((char *)(_o)) < ((char *) &(_sm)->options[0] + \
  43                         (_sm)->options_size * (_sm)->n_options); \
  44                  _o = (struct uci_optmap *) ((char *)(_o) + \
  45                         (_sm)->options_size))
  46
  47
  48 static inline bool
  49 ucimap_is_alloc(enum ucimap_type type)
  50 {
  51         switch(type & UCIMAP_SUBTYPE) {
  52         case UCIMAP_STRING:
  53                 return true;
  54         default:
  55                 return false;
  56         }
  57 }
  58
  59 static inline bool
  60 ucimap_is_fixup(enum ucimap_type type)
  61 {
  62         switch(type & UCIMAP_SUBTYPE) {
  63         case UCIMAP_SECTION:
  64                 return true;
  65         default:
  66                 return false;
  67         }
  68 }
  69
  70 static inline bool
  71 ucimap_is_simple(enum ucimap_type type)
  72 {
  73         return ((type & UCIMAP_TYPE) == UCIMAP_SIMPLE);
  74 }
  75
  76 static inline bool
  77 ucimap_is_list(enum ucimap_type type)
  78 {
  79         return ((type & UCIMAP_TYPE) == UCIMAP_LIST);
  80 }
  81
  82 static inline bool
  83 ucimap_is_list_auto(enum ucimap_type type)
  84 {
  85         return ucimap_is_list(type) && !!(type & UCIMAP_LIST_AUTO);
  86 }
  87
  88 static inline bool
  89 ucimap_is_custom(enum ucimap_type type)
  90 {
  91         return ((type & UCIMAP_SUBTYPE) == UCIMAP_CUSTOM);
  92 }
  93
  94 static inline void *
  95 ucimap_section_ptr(struct ucimap_section_data *sd)
  96 {
  97         return ((char *) sd - sd->sm->smap_offset);
  98 }
  99
 100 static inline union ucimap_data *
 101 ucimap_get_data(struct ucimap_section_data *sd, struct uci_optmap *om)
 102 {
 103         void *data;
 104
 105         data = (char *) ucimap_section_ptr(sd) + om->offset;
 106         return data;
 107 }
 108
 109 int
 110 ucimap_init(struct uci_map *map)
 111 {
 112         INIT_LIST_HEAD(&map->sdata);
 113         INIT_LIST_HEAD(&map->fixup);
 114         return 0;
 115 }
 116
 117 static void
 118 ucimap_free_item(struct uci_alloc *a)
 119 {
 120         switch(a->type & UCIMAP_TYPE) {
 121         case UCIMAP_SIMPLE:
 122         case UCIMAP_LIST:
 123                 free(a->data.ptr);
 124                 break;
 125         }
 126 }
 127
 128 static void
 129 ucimap_add_alloc(struct ucimap_section_data *sd, void *ptr)
 130 {
 131         struct uci_alloc *a = &sd->allocmap[sd->allocmap_len++];
 132         a->type = UCIMAP_SIMPLE;
 133         a->data.ptr = ptr;
 134 }
 135
 136 static void
 137 ucimap_free_section(struct uci_map *map, struct ucimap_section_data *sd)
 138 {
 139         void *section;
 140         int i;
 141
 142         section = ucimap_section_ptr(sd);
 143         if (!list_empty(&sd->list))
 144                 list_del(&sd->list);
 145
 146         if (sd->sm->free)
 147                 sd->sm->free(map, section);
 148
 149         for (i = 0; i < sd->allocmap_len; i++) {
 150                 ucimap_free_item(&sd->allocmap[i]);
 151         }
 152
 153         free(sd->allocmap);
 154         free(sd);
 155 }
 156
 157 void
 158 ucimap_cleanup(struct uci_map *map)
 159 {
 160         struct list_head *ptr, *tmp;
 161
 162         list_for_each_safe(ptr, tmp, &map->sdata) {
 163                 struct ucimap_section_data *sd = list_entry(ptr, struct ucimap_section_data, list);
 164                 ucimap_free_section(map, sd);
 165         }
 166 }
 167
 168 static void
 169 ucimap_add_fixup(struct uci_map *map, union ucimap_data *data, struct uci_optmap *om, const char *str)
 170 {
 171         struct uci_fixup *f;
 172
 173         f = malloc(sizeof(struct uci_fixup));
 174         if (!f)
 175                 return;
 176
 177         INIT_LIST_HEAD(&f->list);
 178         f->sm = om->data.sm;
 179         f->name = str;
 180         f->type = om->type;
 181         f->data = data;
 182         list_add_tail(&f->list, &map->fixup);
 183 }
 184
 185 static void
 186 ucimap_add_value(union ucimap_data *data, struct uci_optmap *om, struct ucimap_section_data *sd, const char *str)
 187 {
 188         union ucimap_data tdata = *data;
 189         char *eptr = NULL;
 190         long lval;
 191         char *s;
 192         int val;
 193
 194         if (ucimap_is_list(om->type) && !ucimap_is_fixup(om->type))
 195                 data = &data->list->item[data->list->n_items++];
 196
 197         switch(om->type & UCIMAP_SUBTYPE) {
 198         case UCIMAP_STRING:
 199                 if ((om->data.s.maxlen > 0) &&
 200                         (strlen(str) > om->data.s.maxlen))
 201                         return;
 202
 203                 s = strdup(str);
 204                 tdata.s = s;
 205                 ucimap_add_alloc(sd, s);
 206                 break;
 207         case UCIMAP_BOOL:
 208                 if (!strcmp(str, "on"))
 209                         val = true;
 210                 else if (!strcmp(str, "1"))
 211                         val = true;
 212                 else if (!strcmp(str, "enabled"))
 213                         val = true;
 214                 else if (!strcmp(str, "off"))
 215                         val = false;
 216                 else if (!strcmp(str, "0"))
 217                         val = false;
 218                 else if (!strcmp(str, "disabled"))
 219                         val = false;
 220                 else
 221                         return;
 222
 223                 tdata.b = val;
 224                 break;
 225         case UCIMAP_INT:
 226                 lval = strtol(str, &eptr, om->data.i.base);
 227                 if (lval < INT_MIN || lval > INT_MAX)
 228                         return;
 229
 230                 if (!eptr || *eptr == '\0')
 231                         tdata.i = (int) lval;
 232                 else
 233                         return;
 234                 break;
 235         case UCIMAP_SECTION:
 236                 ucimap_add_fixup(sd->map, data, om, str);
 237                 return;
 238         case UCIMAP_CUSTOM:
 239                 tdata.s = (char *) data;
 240                 break;
 241         }
 242         if (om->parse) {
 243                 if (om->parse(ucimap_section_ptr(sd), om, &tdata, str) < 0)
 244                         return;
 245         }
 246         if (ucimap_is_custom(om->type))
 247                 return;
 248         memcpy(data, &tdata, sizeof(union ucimap_data));
 249 }
 250
 251
 252 static void
 253 ucimap_convert_list(union ucimap_data *data, struct uci_optmap *om, struct ucimap_section_data *sd, const char *str)
 254 {
 255         char *s, *p;
 256
 257         s = strdup(str);
 258         if (!s)
 259                 return;
 260
 261         ucimap_add_alloc(sd, s);
 262
 263         do {
 264                 while (isspace(*s))
 265                         s++;
 266
 267                 if (!*s)
 268                         break;
 269
 270                 p = s;
 271                 while (*s && !isspace(*s))
 272                         s++;
 273
 274                 if (isspace(*s)) {
 275                         *s = 0;
 276                         s++;
 277                 }
 278
 279                 ucimap_add_value(data, om, sd, p);
 280         } while (*s);
 281 }
 282
 283 static int
 284 ucimap_parse_options(struct uci_map *map, struct uci_sectionmap *sm, struct ucimap_section_data *sd, struct uci_section *s)
 285 {
 286         struct uci_element *e, *l;
 287         struct uci_option *o;
 288         union ucimap_data *data;
 289
 290         uci_foreach_element(&s->options, e) {
 291                 struct uci_optmap *om = NULL, *tmp;
 292
 293                 ucimap_foreach_option(sm, tmp) {
 294                         if (strcmp(e->name, tmp->name) == 0) {
 295                                 om = tmp;
 296                                 break;
 297                         }
 298                 }
 299                 if (!om)
 300                         continue;
 301
 302                 data = ucimap_get_data(sd, om);
 303                 o = uci_to_option(e);
 304                 if ((o->type == UCI_TYPE_STRING) && ucimap_is_simple(om->type)) {
 305                         ucimap_add_value(data, om, sd, o->v.string);
 306                 } else if ((o->type == UCI_TYPE_LIST) && ucimap_is_list(om->type)) {
 307                         uci_foreach_element(&o->v.list, l) {
 308                                 ucimap_add_value(data, om, sd, l->name);
 309                         }
 310                 } else if ((o->type == UCI_TYPE_STRING) && ucimap_is_list_auto(om->type)) {
 311                         ucimap_convert_list(data, om, sd, o->v.string);
 312                 }
 313         }
 314
 315         return 0;
 316 }
 317
 318
 319 static int
 320 ucimap_parse_section(struct uci_map *map, struct uci_sectionmap *sm, struct uci_section *s)
 321 {
 322         struct ucimap_section_data *sd = NULL;
 323         struct uci_optmap *om;
 324         char *section_name;
 325         void *section;
 326         int n_alloc = 2;
 327         int err;
 328
 329         if (sm->alloc) {
 330                 sd = sm->alloc(map, sm, s);
 331                 memset(sd, 0, sizeof(struct ucimap_section_data));
 332         } else {
 333                 sd = malloc(sm->alloc_len);
 334                 memset(sd, 0, sm->alloc_len);
 335         }
 336
 337         if (!sd)
 338                 return UCI_ERR_MEM;
 339
 340         INIT_LIST_HEAD(&sd->list);
 341         sd->map = map;
 342         sd->sm = sm;
 343
 344         ucimap_foreach_option(sm, om) {
 345                 if (ucimap_is_list(om->type)) {
 346                         union ucimap_data *data;
 347                         struct uci_element *e;
 348                         int n_elements = 0;
 349                         int size;
 350
 351                         data = ucimap_get_data(sd, om);
 352                         uci_foreach_element(&s->options, e) {
 353                                 struct uci_option *o = uci_to_option(e);
 354                                 struct uci_element *tmp;
 355
 356                                 if (strcmp(e->name, om->name) != 0)
 357                                         continue;
 358
 359                                 if (o->type == UCI_TYPE_LIST) {
 360                                         uci_foreach_element(&o->v.list, tmp) {
 361                                                 n_elements++;
 362                                         }
 363                                 } else if ((o->type == UCI_TYPE_STRING) &&
 364                                            ucimap_is_list_auto(om->type)) {
 365                                         const char *data = o->v.string;
 366                                         do {
 367                                                 while (isspace(*data))
 368                                                         data++;
 369
 370                                                 if (!*data)
 371                                                         break;
 372
 373                                                 n_elements++;
 374
 375                                                 while (*data && !isspace(*data))
 376                                                         data++;
 377                                         } while (*data);
 378
 379                                         /* for the duplicated data string */
 380                                         if (n_elements > 0)
 381                                                 n_alloc++;
 382                                 }
 383                                 break;
 384                         }
 385                         /* add one more for the ucimap_list */
 386                         n_alloc += n_elements + 1;
 387                         size = sizeof(struct ucimap_list) +
 388                                 n_elements * sizeof(union ucimap_data);
 389                         data->list = malloc(size);
 390                         memset(data->list, 0, size);
 391                 } else if (ucimap_is_alloc(om->type)) {
 392                         n_alloc++;
 393                 }
 394         }
 395
 396         sd->allocmap = malloc(n_alloc * sizeof(struct uci_alloc));
 397         if (!sd->allocmap)
 398                 goto error_mem;
 399
 400         section_name = strdup(s->e.name);
 401         if (!section_name)
 402                 goto error_mem;
 403
 404         sd->section_name = section_name;
 405
 406         sd->cmap = malloc(BITFIELD_SIZE(sm->n_options));
 407         if (!sd->cmap)
 408                 goto error_mem;
 409
 410         memset(sd->cmap, 0, BITFIELD_SIZE(sm->n_options));
 411         ucimap_add_alloc(sd, (void *)section_name);
 412         ucimap_add_alloc(sd, (void *)sd->cmap);
 413         ucimap_foreach_option(sm, om) {
 414                 if (!ucimap_is_list(om->type))
 415                         continue;
 416
 417                 ucimap_add_alloc(sd, ucimap_get_data(sd, om)->list);
 418         }
 419
 420         section = ucimap_section_ptr(sd);
 421         err = sm->init(map, section, s);
 422         if (err)
 423                 goto error;
 424
 425         list_add(&sd->list, &map->sdata);
 426         err = ucimap_parse_options(map, sm, sd, s);
 427         if (err)
 428                 goto error;
 429
 430         return 0;
 431
 432 error_mem:
 433         if (sd->allocmap)
 434                 free(sd->allocmap);
 435         free(sd);
 436         return UCI_ERR_MEM;
 437
 438 error:
 439         ucimap_free_section(map, sd);
 440         return err;
 441 }
 442
 443 static int
 444 ucimap_fill_ptr(struct uci_ptr *ptr, struct uci_section *s, const char *option)
 445 {
 446         struct uci_package *p = s->package;
 447
 448         memset(ptr, 0, sizeof(struct uci_ptr));
 449
 450         ptr->package = p->e.name;
 451         ptr->p = p;
 452
 453         ptr->section = s->e.name;
 454         ptr->s = s;
 455
 456         ptr->option = option;
 457         return uci_lookup_ptr(p->ctx, ptr, NULL, false);
 458 }
 459
 460 void
 461 ucimap_set_changed(struct ucimap_section_data *sd, void *field)
 462 {
 463         void *section = ucimap_section_ptr(sd);
 464         struct uci_sectionmap *sm = sd->sm;
 465         struct uci_optmap *om;
 466         int ofs = (char *)field - (char *)section;
 467         int i = 0;
 468
 469         ucimap_foreach_option(sm, om) {
 470                 if (om->offset == ofs) {
 471                         SET_BIT(sd->cmap, i);
 472                         break;
 473                 }
 474                 i++;
 475         }
 476 }
 477
 478 int
 479 ucimap_store_section(struct uci_map *map, struct uci_package *p, struct ucimap_section_data *sd)
 480 {
 481         struct uci_sectionmap *sm = sd->sm;
 482         struct uci_section *s = NULL;
 483         struct uci_optmap *om;
 484         struct uci_element *e;
 485         struct uci_ptr ptr;
 486         int i = 0;
 487         int ret;
 488
 489         uci_foreach_element(&p->sections, e) {
 490                 if (!strcmp(e->name, sd->section_name)) {
 491                         s = uci_to_section(e);
 492                         break;
 493                 }
 494         }
 495         if (!s)
 496                 return UCI_ERR_NOTFOUND;
 497
 498         ucimap_foreach_option(sm, om) {
 499                 union ucimap_data *data;
 500                 static char buf[32];
 501                 char *str = NULL;
 502
 503                 i++;
 504                 if (ucimap_is_list(om->type))
 505                         continue;
 506
 507                 data = ucimap_get_data(sd, om);
 508                 if (!TEST_BIT(sd->cmap, i - 1))
 509                         continue;
 510
 511                 ucimap_fill_ptr(&ptr, s, om->name);
 512                 switch(om->type & UCIMAP_SUBTYPE) {
 513                 case UCIMAP_STRING:
 514                         str = data->s;
 515                         break;
 516                 case UCIMAP_INT:
 517                         sprintf(buf, "%d", data->i);
 518                         str = buf;
 519                         break;
 520                 case UCIMAP_BOOL:
 521                         sprintf(buf, "%d", !!data->b);
 522                         str = buf;
 523                         break;
 524                 case UCIMAP_CUSTOM:
 525                         break;
 526                 default:
 527                         continue;
 528                 }
 529                 if (om->format) {
 530                         union ucimap_data tdata, *data;
 531
 532                         data = ucimap_get_data(sd, om);
 533                         if (ucimap_is_custom(om->type)) {
 534                                 tdata.s = (char *)data;
 535                                 data = &tdata;
 536                         }
 537
 538                         if (om->format(ucimap_section_ptr(sd), om, data, &str) < 0)
 539                                 continue;
 540                 }
 541                 if (!str)
 542                         continue;
 543                 ptr.value = str;
 544
 545                 ret = uci_set(s->package->ctx, &ptr);
 546                 if (ret)
 547                         return ret;
 548
 549                 CLR_BIT(sd->cmap, i - 1);
 550         }
 551
 552         return 0;
 553 }
 554
 555 void *
 556 ucimap_find_section(struct uci_map *map, struct uci_fixup *f)
 557 {
 558         struct ucimap_section_data *sd;
 559         struct list_head *p;
 560
 561         list_for_each(p, &map->sdata) {
 562                 sd = list_entry(p, struct ucimap_section_data, list);
 563                 if (sd->sm != f->sm)
 564                         continue;
 565                 if (strcmp(f->name, sd->section_name) != 0)
 566                         continue;
 567                 return ucimap_section_ptr(sd);
 568         }
 569         return NULL;
 570 }
 571
 572 void
 573 ucimap_parse(struct uci_map *map, struct uci_package *pkg)
 574 {
 575         struct uci_element *e;
 576         struct list_head *p, *tmp;
 577         int i;
 578
 579         INIT_LIST_HEAD(&map->fixup);
 580         uci_foreach_element(&pkg->sections, e) {
 581                 struct uci_section *s = uci_to_section(e);
 582
 583                 for (i = 0; i < map->n_sections; i++) {
 584                         if (strcmp(s->type, map->sections[i]->type) != 0)
 585                                 continue;
 586                         ucimap_parse_section(map, map->sections[i], s);
 587                 }
 588         }
 589         list_for_each_safe(p, tmp, &map->fixup) {
 590                 struct uci_fixup *f = list_entry(p, struct uci_fixup, list);
 591                 void *ptr = ucimap_find_section(map, f);
 592                 struct ucimap_list *list;
 593
 594                 if (!ptr)
 595                         continue;
 596
 597                 switch(f->type & UCIMAP_TYPE) {
 598                 case UCIMAP_SIMPLE:
 599                         f->data->section = ptr;
 600                         break;
 601                 case UCIMAP_LIST:
 602                         list = f->data->list;
 603                         list->item[list->n_items++].section = ptr;
 604                         break;
 605                 }
 606                 free(f);
 607         }
 608         list_for_each_safe(p, tmp, &map->sdata) {
 609                 struct ucimap_section_data *sd = list_entry(p, struct ucimap_section_data, list);
 610                 void *section;
 611
 612                 if (sd->done)
 613                         continue;
 614
 615                 section = ucimap_section_ptr(sd);
 616                 if (sd->sm->add(map, section) != 0)
 617                         ucimap_free_section(map, sd);
 618         }
 619 }