config.c

   1 /*
   2  * Asterisk -- A telephony toolkit for Linux.
   3  *
   4  * Configuration File Parser
   5  *
   6  * Copyright (C) 1999 - 2005, Digium, Inc.
   7  *
   8  * Mark Spencer <markster@digium.com>
   9  *
  10  * This program is free software, distributed under the terms of
  11  * the GNU General Public License
  12  */
  13
  14 #include <stdio.h>
  15 #include <unistd.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18 #include <errno.h>
  19 #include <time.h>
  20 #define AST_INCLUDE_GLOB 1
  21 #ifdef AST_INCLUDE_GLOB
  22 #ifdef __OSX__
  23 #define GLOB_ABORTED GLOB_ABEND
  24 #endif
  25 # include <glob.h>
  26 #endif
  27 #include <asterisk/config.h>
  28 #include <asterisk/cli.h>
  29 #include <asterisk/lock.h>
  30 #include <asterisk/options.h>
  31 #include <asterisk/logger.h>
  32 #include <asterisk/utils.h>
  33 #include <asterisk/channel.h>
  34 #include <asterisk/app.h>
  35 #include "asterisk.h"
  36 #include "astconf.h"
  37
  38 #define MAX_NESTED_COMMENTS 128
  39 #define COMMENT_START ";--"
  40 #define COMMENT_END "--;"
  41 #define COMMENT_META ';'
  42 #define COMMENT_TAG '-'
  43
  44 static char *extconfig_conf = "extconfig.conf";
  45
  46 static struct ast_config_map {
  47         struct ast_config_map *next;
  48         char *name;
  49         char *driver;
  50         char *database;
  51         char *table;
  52         char stuff[0];
  53 } *config_maps = NULL;
  54
  55 AST_MUTEX_DEFINE_STATIC(config_lock);
  56 static struct ast_config_engine *config_engine_list;
  57
  58 #define MAX_INCLUDE_LEVEL 10
  59
  60 struct ast_comment {
  61         struct ast_comment *next;
  62         char cmt[0];
  63 };
  64
  65 struct ast_category {
  66         char name[80];
  67         int ignored;                    /* do not let user of the config see this category */
  68         struct ast_variable *root;
  69         struct ast_variable *last;
  70         struct ast_category *next;
  71 };
  72
  73 struct ast_config {
  74         struct ast_category *root;
  75         struct ast_category *last;
  76         struct ast_category *current;
  77         struct ast_category *last_browse;               /* used to cache the last category supplied via category_browse */
  78         int include_level;
  79         int max_include_level;
  80 };
  81
  82 int ast_true(const char *s)
  83 {
  84         if (!s)
  85                 return 0;
  86         /* Determine if this is a true value */
  87         if (!strcasecmp(s, "yes") ||
  88             !strcasecmp(s, "true") ||
  89             !strcasecmp(s, "y") ||
  90             !strcasecmp(s, "t") ||
  91             !strcasecmp(s, "1") ||
  92             !strcasecmp(s, "on"))
  93                 return -1;
  94         return 0;
  95 }
  96
  97 int ast_false(const char *s)
  98 {
  99         if (!s)
 100                 return 0;
 101         /* Determine if this is a false value */
 102         if (!strcasecmp(s, "no") ||
 103             !strcasecmp(s, "false") ||
 104             !strcasecmp(s, "n") ||
 105             !strcasecmp(s, "f") ||
 106             !strcasecmp(s, "0") ||
 107             !strcasecmp(s, "off"))
 108                 return -1;
 109         return 0;
 110 }
 111
 112 struct ast_variable *ast_variable_new(const char *name, const char *value)
 113 {
 114         struct ast_variable *variable;
 115
 116         int length = strlen(name) + strlen(value) + 2 + sizeof(struct ast_variable);
 117         variable = malloc(length);
 118         if (variable) {
 119                 memset(variable, 0, length);
 120                 variable->name = variable->stuff;
 121                 variable->value = variable->stuff + strlen(name) + 1;
 122                 strcpy(variable->name,name);
 123                 strcpy(variable->value,value);
 124         }
 125
 126         return variable;
 127 }
 128
 129 void ast_variable_append(struct ast_category *category, struct ast_variable *variable)
 130 {
 131         if (category->last)
 132                 category->last->next = variable;
 133         else
 134                 category->root = variable;
 135         category->last = variable;
 136 }
 137
 138 void ast_variables_destroy(struct ast_variable *v)
 139 {
 140         struct ast_variable *vn;
 141
 142         while(v) {
 143                 vn = v;
 144                 v = v->next;
 145                 free(vn);
 146         }
 147 }
 148
 149 struct ast_variable *ast_variable_browse(const struct ast_config *config, const char *category)
 150 {
 151         struct ast_category *cat = NULL;
 152
 153         if (category && config->last_browse && (config->last_browse->name == category))
 154                 cat = config->last_browse;
 155         else
 156                 cat = ast_category_get(config, category);
 157
 158         if (cat)
 159                 return cat->root;
 160         else
 161                 return NULL;
 162 }
 163
 164 char *ast_variable_retrieve(const struct ast_config *config, const char *category, const char *variable)
 165 {
 166         struct ast_variable *v;
 167
 168         if (category) {
 169                 for (v = ast_variable_browse(config, category); v; v = v->next)
 170                         if (variable == v->name)
 171                                 return v->value;
 172                 for (v = ast_variable_browse(config, category); v; v = v->next)
 173                         if (!strcasecmp(variable, v->name))
 174                                 return v->value;
 175         } else {
 176                 struct ast_category *cat;
 177
 178                 for (cat = config->root; cat; cat = cat->next)
 179                         for (v = cat->root; v; v = v->next)
 180                                 if (!strcasecmp(variable, v->name))
 181                                         return v->value;
 182         }
 183
 184         return NULL;
 185 }
 186
 187 static struct ast_variable *variable_clone(const struct ast_variable *old)
 188 {
 189         struct ast_variable *new = ast_variable_new(old->name, old->value);
 190
 191         if (new) {
 192                 new->lineno = old->lineno;
 193                 new->object = old->object;
 194                 new->blanklines = old->blanklines;
 195                 /* TODO: clone comments? */
 196         }
 197
 198         return new;
 199 }
 200
 201 static void move_variables(struct ast_category *old, struct ast_category *new)
 202 {
 203         struct ast_variable *var;
 204         struct ast_variable *next;
 205
 206         next = old->root;
 207         old->root = NULL;
 208         for (var = next; var; var = next) {
 209                 next = var->next;
 210                 var->next = NULL;
 211                 ast_variable_append(new, var);
 212         }
 213 }
 214
 215 struct ast_category *ast_category_new(const char *name)
 216 {
 217         struct ast_category *category;
 218
 219         category = malloc(sizeof(struct ast_category));
 220         if (category) {
 221                 memset(category, 0, sizeof(struct ast_category));
 222                 strncpy(category->name, name, sizeof(category->name) - 1);
 223         }
 224
 225         return category;
 226 }
 227
 228 static struct ast_category *category_get(const struct ast_config *config, const char *category_name, int ignored)
 229 {
 230         struct ast_category *cat;
 231
 232         for (cat = config->root; cat; cat = cat->next) {
 233                 if (cat->name == category_name && (ignored || !cat->ignored))
 234                         return cat;
 235         }
 236
 237         for (cat = config->root; cat; cat = cat->next) {
 238                 if (!strcasecmp(cat->name, category_name) && (ignored || !cat->ignored))
 239                         return cat;
 240         }
 241
 242         return NULL;
 243 }
 244
 245 struct ast_category *ast_category_get(const struct ast_config *config, const char *category_name)
 246 {
 247         return category_get(config, category_name, 0);
 248 }
 249
 250 int ast_category_exist(const struct ast_config *config, const char *category_name)
 251 {
 252         return !!ast_category_get(config, category_name);
 253 }
 254
 255 void ast_category_append(struct ast_config *config, struct ast_category *category)
 256 {
 257         if (config->last)
 258                 config->last->next = category;
 259         else
 260                 config->root = category;
 261         config->last = category;
 262         config->current = category;
 263 }
 264
 265 void ast_category_destroy(struct ast_category *cat)
 266 {
 267         ast_variables_destroy(cat->root);
 268         free(cat);
 269 }
 270
 271 static struct ast_category *next_available_category(struct ast_category *cat)
 272 {
 273         for (; cat && cat->ignored; cat = cat->next);
 274
 275         return cat;
 276 }
 277
 278 char *ast_category_browse(struct ast_config *config, const char *prev)
 279 {
 280         struct ast_category *cat = NULL;
 281
 282         if (prev && config->last_browse && (config->last_browse->name == prev))
 283                 cat = config->last_browse->next;
 284         else if (!prev && config->root)
 285                         cat = config->root;
 286         else if (prev) {
 287                 for (cat = config->root; cat; cat = cat->next) {
 288                         if (cat->name == prev) {
 289                                 cat = cat->next;
 290                                 break;
 291                         }
 292                 }
 293                 if (!cat) {
 294                         for (cat = config->root; cat; cat = cat->next) {
 295                                 if (!strcasecmp(cat->name, prev)) {
 296                                         cat = cat->next;
 297                                         break;
 298                                 }
 299                         }
 300                 }
 301         }
 302
 303         if (cat)
 304                 cat = next_available_category(cat);
 305
 306         config->last_browse = cat;
 307         if (cat)
 308                 return cat->name;
 309         else
 310                 return NULL;
 311 }
 312
 313 struct ast_variable *ast_category_detach_variables(struct ast_category *cat)
 314 {
 315         struct ast_variable *v;
 316
 317         v = cat->root;
 318         cat->root = NULL;
 319
 320         return v;
 321 }
 322
 323 void ast_category_rename(struct ast_category *cat, const char *name)
 324 {
 325         strncpy(cat->name, name, sizeof(cat->name) - 1);
 326 }
 327
 328 static void inherit_category(struct ast_category *new, const struct ast_category *base)
 329 {
 330         struct ast_variable *var;
 331
 332         for (var = base->root; var; var = var->next) {
 333                 struct ast_variable *v;
 334
 335                 v = variable_clone(var);
 336                 if (v)
 337                         ast_variable_append(new, v);
 338         }
 339 }
 340
 341 struct ast_config *ast_config_new(void)
 342 {
 343         struct ast_config *config;
 344
 345         config = malloc(sizeof(*config));
 346         if (config) {
 347                 memset(config, 0, sizeof(*config));
 348                 config->max_include_level = MAX_INCLUDE_LEVEL;
 349         }
 350
 351         return config;
 352 }
 353
 354 void ast_config_destroy(struct ast_config *cfg)
 355 {
 356         struct ast_category *cat, *catn;
 357
 358         if (!cfg)
 359                 return;
 360
 361         cat = cfg->root;
 362         while(cat) {
 363                 ast_variables_destroy(cat->root);
 364                 catn = cat;
 365                 cat = cat->next;
 366                 free(catn);
 367         }
 368         free(cfg);
 369 }
 370
 371 struct ast_category *ast_config_get_current_category(const struct ast_config *cfg)
 372 {
 373         return cfg->current;
 374 }
 375
 376 void ast_config_set_current_category(struct ast_config *cfg, const struct ast_category *cat)
 377 {
 378         /* cast below is just to silence compiler warning about dropping "const" */
 379         cfg->current = (struct ast_category *) cat;
 380 }
 381
 382 static int process_text_line(struct ast_config *cfg, struct ast_category **cat, char *buf, int lineno, const char *configfile)
 383 {
 384         char *c;
 385         char *cur = buf;
 386         struct ast_variable *v;
 387         char cmd[512], exec_file[512];
 388         int object, do_exec, do_include;
 389
 390         /* Actually parse the entry */
 391         if (cur[0] == '[') {
 392                 struct ast_category *newcat = NULL;
 393                 char *catname;
 394
 395                 /* A category header */
 396                 c = strchr(cur, ']');
 397                 if (!c) {
 398                         ast_log(LOG_WARNING, "parse error: no closing ']', line %d of %s\n", lineno, configfile);
 399                         return -1;
 400                 }
 401                 *c++ = '\0';
 402                 cur++;
 403                 if (*c++ != '(')
 404                         c = NULL;
 405                 catname = cur;
 406                 *cat = newcat = ast_category_new(catname);
 407                 if (!newcat) {
 408                         ast_log(LOG_WARNING, "Out of memory, line %d of %s\n", lineno, configfile);
 409                         return -1;
 410                 }
 411                 /* If there are options or categories to inherit from, process them now */
 412                 if (c) {
 413                         if (!(cur = strchr(c, ')'))) {
 414                                 ast_log(LOG_WARNING, "parse error: no closing ')', line %d of %s\n", lineno, configfile);
 415                                 return -1;
 416                         }
 417                         *cur = '\0';
 418                         while ((cur = strsep(&c, ","))) {
 419                                 if (!strcasecmp(cur, "!")) {
 420                                         (*cat)->ignored = 1;
 421                                 } else if (!strcasecmp(cur, "+")) {
 422                                         *cat = category_get(cfg, catname, 1);
 423                                         if (!*cat) {
 424                                                 ast_destroy(cfg);
 425                                                 if (newcat)
 426                                                         ast_category_destroy(newcat);
 427                                                 ast_log(LOG_WARNING, "Category addition requested, but category '%s' does not exist, line %d of %s\n", catname, lineno, configfile);
 428                                                 return -1;
 429                                         }
 430                                         if (newcat) {
 431                                                 move_variables(newcat, *cat);
 432                                                 ast_category_destroy(newcat);
 433                                                 newcat = NULL;
 434                                         }
 435                                 } else {
 436                                         struct ast_category *base;
 437
 438                                         base = category_get(cfg, cur, 1);
 439                                         if (!base) {
 440                                                 ast_log(LOG_WARNING, "Inheritance requested, but category '%s' does not exist, line %d of %s\n", cur, lineno, configfile);
 441                                                 return -1;
 442                                         }
 443                                         inherit_category(*cat, base);
 444                                 }
 445                         }
 446                 }
 447                 if (newcat)
 448                         ast_category_append(cfg, *cat);
 449         } else if (cur[0] == '#') {
 450                 /* A directive */
 451                 cur++;
 452                 c = cur;
 453                 while(*c && (*c > 32)) c++;
 454                 if (*c) {
 455                         *c = '\0';
 456                         c++;
 457                         /* Find real argument */
 458                         while(*c  && (*c < 33)) c++;
 459                         if (!*c)
 460                                 c = NULL;
 461                 } else
 462                         c = NULL;
 463                 do_include = !strcasecmp(cur, "include");
 464                 if(!do_include)
 465                         do_exec = !strcasecmp(cur, "exec");
 466                 else
 467                         do_exec = 0;
 468                 if (do_exec && !option_exec_includes) {
 469                         ast_log(LOG_WARNING, "Cannot perform #exec unless execincludes option is enabled in asterisk.conf (options section)!\n");
 470                         do_exec = 0;
 471                 }
 472                 if (do_include || do_exec) {
 473                         if (c) {
 474                                 /* Strip off leading and trailing "'s and <>'s */
 475                                 while((*c == '<') || (*c == '>') || (*c == '\"')) c++;
 476                                 /* Get rid of leading mess */
 477                                 cur = c;
 478                                 while (!ast_strlen_zero(cur)) {
 479                                         c = cur + strlen(cur) - 1;
 480                                         if ((*c == '>') || (*c == '<') || (*c == '\"'))
 481                                                 *c = '\0';
 482                                         else
 483                                                 break;
 484                                 }
 485                                 /* #exec </path/to/executable>
 486                                    We create a tmp file, then we #include it, then we delete it. */
 487                                 if (do_exec) {
 488                                         snprintf(exec_file, sizeof(exec_file), "/var/tmp/exec.%ld.%ld", time(NULL), pthread_self());
 489                                         snprintf(cmd, sizeof(cmd), "%s > %s 2>&1", cur, exec_file);
 490                                         ast_safe_system(cmd);
 491                                         cur = exec_file;
 492                                 } else
 493                                         exec_file[0] = '\0';
 494                                 /* A #include */
 495                                 do_include = ast_config_internal_load(cur, cfg) ? 1 : 0;
 496                                 if(!ast_strlen_zero(exec_file))
 497                                         unlink(exec_file);
 498                                 if(!do_include)
 499                                         return -1;
 500
 501                         } else {
 502                                 ast_log(LOG_WARNING, "Directive '#%s' needs an argument (%s) at line %d of %s\n",
 503                                                 do_exec ? "exec" : "include",
 504                                                 do_exec ? "/path/to/executable" : "filename",
 505                                                 lineno,
 506                                                 configfile);
 507                         }
 508                 }
 509                 else
 510                         ast_log(LOG_WARNING, "Unknown directive '%s' at line %d of %s\n", cur, lineno, configfile);
 511         } else {
 512                 /* Just a line (variable = value) */
 513                 if (!*cat) {
 514                         ast_log(LOG_WARNING,
 515                                 "parse error: No category context for line %d of %s\n", lineno, configfile);
 516                         return -1;
 517                 }
 518                 c = strchr(cur, '=');
 519                 if (c) {
 520                         *c = 0;
 521                         c++;
 522                         /* Ignore > in => */
 523                         if (*c== '>') {
 524                                 object = 1;
 525                                 c++;
 526                         } else
 527                                 object = 0;
 528                         v = ast_variable_new(ast_strip(cur), ast_strip(c));
 529                         if (v) {
 530                                 v->lineno = lineno;
 531                                 v->object = object;
 532                                 /* Put and reset comments */
 533                                 v->blanklines = 0;
 534                                 ast_variable_append(*cat, v);
 535                         } else {
 536                                 ast_log(LOG_WARNING, "Out of memory, line %d\n", lineno);
 537                                 return -1;
 538                         }
 539                 } else {
 540                         ast_log(LOG_WARNING, "No '=' (equal sign) in line %d of %s\n", lineno, configfile);
 541                 }
 542
 543         }
 544         return 0;
 545 }
 546
 547 static struct ast_config *config_text_file_load(const char *database, const char *table, const char *filename, struct ast_config *cfg)
 548 {
 549         char fn[256];
 550         char buf[8192];
 551         char *new_buf, *comment_p, *process_buf;
 552         FILE *f;
 553         int lineno=0;
 554         int comment = 0, nest[MAX_NESTED_COMMENTS];
 555         struct ast_category *cat = NULL;
 556
 557         cat = ast_config_get_current_category(cfg);
 558
 559         if (filename[0] == '/') {
 560                 strncpy(fn, filename, sizeof(fn)-1);
 561         } else {
 562                 snprintf(fn, sizeof(fn), "%s/%s", (char *)ast_config_AST_CONFIG_DIR, filename);
 563         }
 564
 565 #ifdef AST_INCLUDE_GLOB
 566         {
 567                 int glob_ret;
 568                 glob_t globbuf;
 569                 globbuf.gl_offs = 0;    /* initialize it to silence gcc */
 570 #ifdef SOLARIS
 571                 glob_ret = glob(fn, GLOB_NOCHECK, NULL, &globbuf);
 572 #else
 573                 glob_ret = glob(fn, GLOB_NOMAGIC|GLOB_BRACE, NULL, &globbuf);
 574 #endif
 575                 if (glob_ret == GLOB_NOSPACE)
 576                         ast_log(LOG_WARNING,
 577                                 "Glob Expansion of pattern '%s' failed: Not enough memory\n", fn);
 578                 else if (glob_ret  == GLOB_ABORTED)
 579                         ast_log(LOG_WARNING,
 580                                 "Glob Expansion of pattern '%s' failed: Read error\n", fn);
 581                 else  {
 582                         /* loop over expanded files */
 583                         int i;
 584                         for (i=0; i<globbuf.gl_pathc; i++) {
 585                                 strncpy(fn, globbuf.gl_pathv[i], sizeof(fn)-1);
 586 #endif
 587         if ((option_verbose > 1) && !option_debug) {
 588                 ast_verbose(  VERBOSE_PREFIX_2 "Parsing '%s': ", fn);
 589                 fflush(stdout);
 590         }
 591         if ((f = fopen(fn, "r"))) {
 592                 if (option_debug)
 593                         ast_log(LOG_DEBUG, "Parsing %s\n", fn);
 594                 else if (option_verbose > 1)
 595                         ast_verbose("Found\n");
 596                 while(!feof(f)) {
 597                         lineno++;
 598                         if (fgets(buf, sizeof(buf), f)) {
 599                                 new_buf = buf;
 600                                 if (comment)
 601                                         process_buf = NULL;
 602                                 else
 603                                         process_buf = buf;
 604                                 while ((comment_p = strchr(new_buf, COMMENT_META))) {
 605                                         if ((comment_p > new_buf) && (*(comment_p-1) == '\\')) {
 606                                                 /* Yuck, gotta memmove */
 607                                                 memmove(comment_p - 1, comment_p, strlen(comment_p) + 1);
 608                                                 new_buf = comment_p;
 609                                         } else if(comment_p[1] == COMMENT_TAG && comment_p[2] == COMMENT_TAG && (comment_p[3] != '-')) {
 610                                                 /* Meta-Comment start detected ";--" */
 611                                                 if (comment < MAX_NESTED_COMMENTS) {
 612                                                         *comment_p = '\0';
 613                                                         new_buf = comment_p + 3;
 614                                                         comment++;
 615                                                         nest[comment-1] = lineno;
 616                                                 } else {
 617                                                         ast_log(LOG_ERROR, "Maximum nest limit of %d reached.\n", MAX_NESTED_COMMENTS);
 618                                                 }
 619                                         } else if ((comment_p >= new_buf + 2) &&
 620                                                    (*(comment_p - 1) == COMMENT_TAG) &&
 621                                                    (*(comment_p - 2) == COMMENT_TAG)) {
 622                                                 /* Meta-Comment end detected */
 623                                                 comment--;
 624                                                 new_buf = comment_p + 1;
 625                                                 if (!comment) {
 626                                                         /* Back to non-comment now */
 627                                                         if (process_buf) {
 628                                                                 /* Actually have to move what's left over the top, then continue */
 629                                                                 char *oldptr;
 630                                                                 oldptr = process_buf + strlen(process_buf);
 631                                                                 memmove(oldptr, new_buf, strlen(new_buf) + 1);
 632                                                                 new_buf = oldptr;
 633                                                         } else
 634                                                                 process_buf = new_buf;
 635                                                 }
 636                                         } else {
 637                                                 if (!comment) {
 638                                                         /* If ; is found, and we are not nested in a comment,
 639                                                            we immediately stop all comment processing */
 640                                                         *comment_p = '\0';
 641                                                         new_buf = comment_p;
 642                                                 } else
 643                                                         new_buf = comment_p + 1;
 644                                         }
 645                                 }
 646                                 if (process_buf) {
 647                                         char *buf = ast_strip(process_buf);
 648                                         if (!ast_strlen_zero(buf))
 649                                                 if (process_text_line(cfg, &cat, buf, lineno, filename)) {
 650                                                         cfg = NULL;
 651                                                         break;
 652                                                 }
 653                                 }
 654                         }
 655                 }
 656                 fclose(f);
 657         } else { /* can't open file */
 658                 if (option_debug)
 659                         ast_log(LOG_DEBUG, "No file to parse: %s\n", fn);
 660                 else if (option_verbose > 1)
 661                         ast_verbose( "Not found (%s)\n", strerror(errno));
 662         }
 663         if (comment) {
 664                 ast_log(LOG_WARNING,"Unterminated comment detected beginning on line %d\n", nest[comment]);
 665         }
 666 #ifdef AST_INCLUDE_GLOB
 667                                         if (!cfg)
 668                                                 break;
 669                                 }
 670                                 globfree(&globbuf);
 671                         }
 672                 }
 673 #endif
 674
 675         return cfg;
 676 }
 677
 678 int config_text_file_save(const char *configfile, const struct ast_config *cfg, const char *generator)
 679 {
 680         FILE *f;
 681         char fn[256];
 682         char date[256]="";
 683         time_t t;
 684         struct ast_variable *var;
 685         struct ast_category *cat;
 686         int blanklines = 0;
 687
 688         if (configfile[0] == '/') {
 689                 strncpy(fn, configfile, sizeof(fn)-1);
 690         } else {
 691                 snprintf(fn, sizeof(fn), "%s/%s", AST_CONFIG_DIR, configfile);
 692         }
 693         time(&t);
 694         strncpy(date, ctime(&t), sizeof(date) - 1);
 695         if ((f = fopen(fn, "w"))) {
 696                 if ((option_verbose > 1) && !option_debug)
 697                         ast_verbose(  VERBOSE_PREFIX_2 "Saving '%s': ", fn);
 698                 fprintf(f, ";!\n");
 699                 fprintf(f, ";! Automatically generated configuration file\n");
 700                 fprintf(f, ";! Filename: %s (%s)\n", configfile, fn);
 701                 fprintf(f, ";! Generator: %s\n", generator);
 702                 fprintf(f, ";! Creation Date: %s", date);
 703                 fprintf(f, ";!\n");
 704                 cat = cfg->root;
 705                 while(cat) {
 706                         /* Dump section with any appropriate comment */
 707                         fprintf(f, "[%s]\n", cat->name);
 708                         var = cat->root;
 709                         while(var) {
 710                                 if (var->sameline)
 711                                         fprintf(f, "%s %s %s  ; %s\n", var->name, (var->object ? "=>" : "="), var->value, var->sameline->cmt);
 712                                 else
 713                                         fprintf(f, "%s %s %s\n", var->name, (var->object ? "=>" : "="), var->value);
 714                                 if (var->blanklines) {
 715                                         blanklines = var->blanklines;
 716                                         while (blanklines--)
 717                                                 fprintf(f, "\n");
 718                                 }
 719
 720                                 var = var->next;
 721                         }
 722 #if 0
 723                         /* Put an empty line */
 724                         fprintf(f, "\n");
 725 #endif
 726                         cat = cat->next;
 727                 }
 728         } else {
 729                 if (option_debug)
 730                         printf("Unable to open for writing: %s\n", fn);
 731                 else if (option_verbose > 1)
 732                         printf( "Unable to write (%s)", strerror(errno));
 733                 return -1;
 734         }
 735         fclose(f);
 736         return 0;
 737 }
 738
 739 static void clear_config_maps(void)
 740 {
 741         struct ast_config_map *map;
 742
 743         ast_mutex_lock(&config_lock);
 744
 745         while (config_maps) {
 746                 map = config_maps;
 747                 config_maps = config_maps->next;
 748                 free(map);
 749         }
 750
 751         ast_mutex_unlock(&config_lock);
 752 }
 753
 754 static int append_mapping(char *name, char *driver, char *database, char *table)
 755 {
 756         struct ast_config_map *map;
 757         int length;
 758
 759         length = sizeof(*map);
 760         length += strlen(name) + 1;
 761         length += strlen(driver) + 1;
 762         length += strlen(database) + 1;
 763         if (table)
 764                 length += strlen(table) + 1;
 765         map = malloc(length);
 766
 767         if (!map)
 768                 return -1;
 769
 770         memset(map, 0, length);
 771         map->name = map->stuff;
 772         strcpy(map->name, name);
 773         map->driver = map->name + strlen(map->name) + 1;
 774         strcpy(map->driver, driver);
 775         map->database = map->driver + strlen(map->driver) + 1;
 776         strcpy(map->database, database);
 777         if (table) {
 778                 map->table = map->database + strlen(map->database) + 1;
 779                 strcpy(map->table, table);
 780         }
 781         map->next = config_maps;
 782
 783         if (option_verbose > 1)
 784                 ast_verbose(VERBOSE_PREFIX_2 "Binding %s to %s/%s/%s\n",
 785                             map->name, map->driver, map->database, map->table ? map->table : map->name);
 786
 787         config_maps = map;
 788         return 0;
 789 }
 790
 791 void read_config_maps(void)
 792 {
 793         struct ast_config *config;
 794         struct ast_variable *v;
 795         char *driver, *table, *database, *stringp;
 796
 797         clear_config_maps();
 798
 799         config = ast_config_new();
 800         config->max_include_level = 1;
 801         config = ast_config_internal_load(extconfig_conf, config);
 802         if (!config)
 803                 return;
 804
 805         for (v = ast_variable_browse(config, "settings"); v; v = v->next) {
 806                 stringp = v->value;
 807                 driver = strsep(&stringp, ",");
 808                 database = strsep(&stringp, ",");
 809                 table = strsep(&stringp, ",");
 810
 811                 if (!strcmp(v->name, extconfig_conf) || !strcmp(v->name, "asterisk.conf")) {
 812                         ast_log(LOG_WARNING, "Cannot bind asterisk.conf or extconfig.conf!\n");
 813                         continue;
 814                 }
 815
 816                 if (!driver || !database)
 817                         continue;
 818                 if (!strcasecmp(v->name, "sipfriends")) {
 819                         ast_log(LOG_WARNING, "The 'sipfriends' table is obsolete, update your config to use sipusers and sippeers, though they can point to the same table.\n");
 820                         append_mapping("sipusers", driver, database, table ? table : "sipfriends");
 821                         append_mapping("sippeers", driver, database, table ? table : "sipfriends");
 822                 } else if (!strcasecmp(v->name, "iaxfriends")) {
 823                         ast_log(LOG_WARNING, "The 'iaxfriends' table is obsolete, update your config to use iaxusers and iaxpeers, though they can point to the same table.\n");
 824                         append_mapping("iaxusers", driver, database, table ? table : "iaxfriends");
 825                         append_mapping("iaxpeers", driver, database, table ? table : "iaxfriends");
 826                 } else
 827                         append_mapping(v->name, driver, database, table);
 828         }
 829
 830         ast_config_destroy(config);
 831 }
 832
 833 int ast_config_engine_register(struct ast_config_engine *new)
 834 {
 835         struct ast_config_engine *ptr;
 836
 837         ast_mutex_lock(&config_lock);
 838
 839         if (!config_engine_list) {
 840                 config_engine_list = new;
 841         } else {
 842                 for (ptr = config_engine_list; ptr->next; ptr=ptr->next);
 843                 ptr->next = new;
 844         }
 845
 846         ast_mutex_unlock(&config_lock);
 847         ast_log(LOG_NOTICE,"Registered Config Engine %s\n", new->name);
 848
 849         return 1;
 850 }
 851
 852 int ast_config_engine_deregister(struct ast_config_engine *del)
 853 {
 854         struct ast_config_engine *ptr, *last=NULL;
 855
 856         ast_mutex_lock(&config_lock);
 857
 858         for (ptr = config_engine_list; ptr; ptr=ptr->next) {
 859                 if (ptr == del) {
 860                         if (last)
 861                                 last->next = ptr->next;
 862                         else
 863                                 config_engine_list = ptr->next;
 864                         break;
 865                 }
 866                 last = ptr;
 867         }
 868
 869         ast_mutex_unlock(&config_lock);
 870
 871         return 0;
 872 }
 873
 874 static struct ast_config_engine *find_engine(const char *filename, char *database, int dbsiz, char *table, int tabsiz)
 875 {
 876         struct ast_config_engine *eng, *ret=NULL;
 877         struct ast_config_map *map;
 878
 879         ast_mutex_lock(&config_lock);
 880
 881         map = config_maps;
 882         while (map) {
 883                 if (!strcasecmp(filename, map->name)) {
 884                         strncpy(database, map->database, dbsiz-1);
 885                         if (map->table)
 886                                 strncpy(table, map->table, tabsiz-1);
 887                         else
 888                                 strncpy(table, filename, tabsiz-1);
 889                         break;
 890                 }
 891                 map = map->next;
 892         }
 893         if (map) {
 894                 for (eng = config_engine_list; eng; eng = eng->next) {
 895                         if (!strcmp(eng->name, map->driver)) {
 896                                 ret = eng;
 897                                 break;
 898                         }
 899                 }
 900         }
 901         ast_mutex_unlock(&config_lock);
 902
 903         return ret;
 904 }
 905
 906 static struct ast_config_engine text_file_engine = {
 907         .name = "text",
 908         .load_func = config_text_file_load,
 909 };
 910
 911 struct ast_config *ast_config_internal_load(const char *filename, struct ast_config *cfg)
 912 {
 913         char db[256];
 914         char table[256];
 915         struct ast_config_engine *loader = &text_file_engine;
 916         struct ast_config *result;
 917
 918         if (cfg->include_level == cfg->max_include_level) {
 919                 ast_log(LOG_WARNING, "Maximum Include level (%d) exceeded\n", cfg->max_include_level);
 920                 return NULL;
 921         }
 922
 923         cfg->include_level++;
 924
 925         if (strcmp(filename, extconfig_conf) && strcmp(filename, "asterisk.conf") && config_engine_list) {
 926                 struct ast_config_engine *eng;
 927
 928                 eng = find_engine(filename, db, sizeof(db), table, sizeof(table));
 929
 930
 931                 if (eng && eng->load_func) {
 932                         loader = eng;
 933                 } else {
 934                         eng = find_engine("global", db, sizeof(db), table, sizeof(table));
 935                         if (eng && eng->load_func)
 936                                 loader = eng;
 937                 }
 938         }
 939
 940         result = loader->load_func(db, table, filename, cfg);
 941
 942         if (result)
 943                 result->include_level--;
 944
 945         return result;
 946 }
 947
 948 struct ast_config *ast_config_load(const char *filename)
 949 {
 950         struct ast_config *cfg;
 951         struct ast_config *result;
 952
 953         cfg = ast_config_new();
 954         if (!cfg)
 955                 return NULL;
 956
 957         result = ast_config_internal_load(filename, cfg);
 958         if (!result)
 959                 ast_config_destroy(cfg);
 960
 961         return result;
 962 }
 963
 964 struct ast_variable *ast_load_realtime(const char *family, ...)
 965 {
 966         struct ast_config_engine *eng;
 967         char db[256]="";
 968         char table[256]="";
 969         struct ast_variable *res=NULL;
 970         va_list ap;
 971
 972         va_start(ap, family);
 973         eng = find_engine(family, db, sizeof(db), table, sizeof(table));
 974         if (eng && eng->realtime_func)
 975                 res = eng->realtime_func(db, table, ap);
 976         va_end(ap);
 977
 978         return res;
 979 }
 980
 981 struct ast_config *ast_load_realtime_multientry(const char *family, ...)
 982 {
 983         struct ast_config_engine *eng;
 984         char db[256]="";
 985         char table[256]="";
 986         struct ast_config *res=NULL;
 987         va_list ap;
 988
 989         va_start(ap, family);
 990         eng = find_engine(family, db, sizeof(db), table, sizeof(table));
 991         if (eng && eng->realtime_multi_func)
 992                 res = eng->realtime_multi_func(db, table, ap);
 993         va_end(ap);
 994
 995         return res;
 996 }
 997
 998 int ast_update_realtime(const char *family, const char *keyfield, const char *lookup, ...)
 999 {
1000         struct ast_config_engine *eng;
1001         int res = -1;
1002         char db[256]="";
1003         char table[256]="";
1004         va_list ap;
1005
1006         va_start(ap, lookup);
1007         eng = find_engine(family, db, sizeof(db), table, sizeof(table));
1008         if (eng && eng->update_func)
1009                 res = eng->update_func(db, table, keyfield, lookup, ap);
1010         va_end(ap);
1011
1012         return res;
1013 }
1014
1015 static int config_command(int fd, int argc, char **argv)
1016 {
1017         struct ast_config_engine *eng;
1018         struct ast_config_map *map;
1019
1020         ast_mutex_lock(&config_lock);
1021
1022         ast_cli(fd, "\n\n");
1023         for (eng = config_engine_list; eng; eng = eng->next) {
1024                 ast_cli(fd, "\nConfig Engine: %s\n", eng->name);
1025                 for (map = config_maps; map; map = map->next)
1026                         if (!strcasecmp(map->driver, eng->name)) {
1027                                 ast_cli(fd, "===> %s (db=%s, table=%s)\n", map->name, map->database,
1028                                         map->table ? map->table : map->name);
1029                                 break;
1030                         }
1031         }
1032         ast_cli(fd,"\n\n");
1033
1034         ast_mutex_unlock(&config_lock);
1035
1036         return 0;
1037 }
1038
1039 static char show_config_help[] =
1040         "Usage: show config mappings\n"
1041         "       Shows the filenames to config engines.\n";
1042
1043 static struct ast_cli_entry config_command_struct = {
1044         { "show", "config", "mappings", NULL }, config_command, "Show Config mappings (file names to config engines)", show_config_help, NULL
1045 };
1046
1047 int register_config_cli()
1048 {
1049         return ast_cli_register(&config_command_struct);
1050 }