res/res_odbc.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 1999 - 2005, Digium, Inc.
   5  *
   6  * Mark Spencer <markster@digium.com>
   7  *
   8  * res_odbc.c <ODBC resource manager>
   9  * Copyright (C) 2004 - 2005 Anthony Minessale II <anthmct@yahoo.com>
  10  *
  11  * See http://www.asterisk.org for more information about
  12  * the Asterisk project. Please do not directly contact
  13  * any of the maintainers of this project for assistance;
  14  * the project provides a web site, mailing lists and IRC
  15  * channels for your use.
  16  *
  17  * This program is free software, distributed under the terms of
  18  * the GNU General Public License Version 2. See the LICENSE file
  19  * at the top of the source tree.
  20  */
  21
  22 /*! \file
  23  *
  24  * \brief ODBC resource manager
  25  *
  26  * \author Mark Spencer <markster@digium.com>
  27  * \author Anthony Minessale II <anthmct@yahoo.com>
  28  *
  29  * \arg See also: \ref cdr_odbc
  30  */
  31
  32 /*** MODULEINFO
  33         <depend>unixodbc</depend>
  34         <depend>ltdl</depend>
  35  ***/
  36
  37 #include "asterisk.h"
  38
  39 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  40
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <unistd.h>
  44 #include <string.h>
  45
  46 #include "asterisk/file.h"
  47 #include "asterisk/logger.h"
  48 #include "asterisk/channel.h"
  49 #include "asterisk/config.h"
  50 #include "asterisk/options.h"
  51 #include "asterisk/pbx.h"
  52 #include "asterisk/module.h"
  53 #include "asterisk/cli.h"
  54 #include "asterisk/lock.h"
  55 #include "asterisk/res_odbc.h"
  56 #include "asterisk/time.h"
  57
  58 struct odbc_class
  59 {
  60         AST_LIST_ENTRY(odbc_class) list;
  61         char name[80];
  62         char dsn[80];
  63         char username[80];
  64         char password[80];
  65         SQLHENV env;
  66         unsigned int haspool:1;         /* Boolean - TDS databases need this */
  67         unsigned int limit:10;          /* Gives a limit of 1023 maximum */
  68         unsigned int count:10;          /* Running count of pooled connections */
  69         unsigned int delme:1;                   /* Purge the class */
  70         unsigned int backslash_is_escape:1;     /* On this database, the backslash is a native escape sequence */
  71         unsigned int idlecheck;                 /* Recheck the connection if it is idle for this long */
  72         AST_LIST_HEAD(, odbc_obj) odbc_obj;
  73 };
  74
  75 AST_LIST_HEAD_STATIC(odbc_list, odbc_class);
  76
  77 static odbc_status odbc_obj_connect(struct odbc_obj *obj);
  78 static odbc_status odbc_obj_disconnect(struct odbc_obj *obj);
  79 static int odbc_register_class(struct odbc_class *class, int connect);
  80
  81
  82 SQLHSTMT ast_odbc_prepare_and_execute(struct odbc_obj *obj, SQLHSTMT (*prepare_cb)(struct odbc_obj *obj, void *data), void *data)
  83 {
  84         int res = 0, i, attempt;
  85         SQLINTEGER nativeerror=0, numfields=0;
  86         SQLSMALLINT diagbytes=0;
  87         unsigned char state[10], diagnostic[256];
  88         SQLHSTMT stmt;
  89
  90         for (attempt = 0; attempt < 2; attempt++) {
  91                 /* This prepare callback may do more than just prepare -- it may also
  92                  * bind parameters, bind results, etc.  The real key, here, is that
  93                  * when we disconnect, all handles become invalid for most databases.
  94                  * We must therefore redo everything when we establish a new
  95                  * connection. */
  96                 stmt = prepare_cb(obj, data);
  97
  98                 if (stmt) {
  99                         res = SQLExecute(stmt);
 100                         if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO) && (res != SQL_NO_DATA)) {
 101                                 if (res == SQL_ERROR) {
 102                                         SQLGetDiagField(SQL_HANDLE_STMT, stmt, 1, SQL_DIAG_NUMBER, &numfields, SQL_IS_INTEGER, &diagbytes);
 103                                         for (i = 0; i < numfields; i++) {
 104                                                 SQLGetDiagRec(SQL_HANDLE_STMT, stmt, i + 1, state, &nativeerror, diagnostic, sizeof(diagnostic), &diagbytes);
 105                                                 ast_log(LOG_WARNING, "SQL Execute returned an error %d: %s: %s (%d)\n", res, state, diagnostic, diagbytes);
 106                                                 if (i > 10) {
 107                                                         ast_log(LOG_WARNING, "Oh, that was good.  There are really %d diagnostics?\n", (int)numfields);
 108                                                         break;
 109                                                 }
 110                                         }
 111                                 }
 112
 113                                 ast_log(LOG_WARNING, "SQL Execute error %d! Attempting a reconnect...\n", res);
 114                                 SQLFreeHandle(SQL_HANDLE_STMT, stmt);
 115                                 stmt = NULL;
 116
 117                                 obj->up = 0;
 118                                 /*
 119                                  * While this isn't the best way to try to correct an error, this won't automatically
 120                                  * fail when the statement handle invalidates.
 121                                  */
 122                                 /* XXX Actually, it might, if we're using a non-pooled connection. Possible race here. XXX */
 123                                 odbc_obj_disconnect(obj);
 124                                 odbc_obj_connect(obj);
 125                                 continue;
 126                         } else
 127                                 obj->last_used = ast_tvnow();
 128                         break;
 129                 } else {
 130                         ast_log(LOG_WARNING, "SQL Prepare failed.  Attempting a reconnect...\n");
 131                         odbc_obj_disconnect(obj);
 132                         odbc_obj_connect(obj);
 133                 }
 134         }
 135
 136         return stmt;
 137 }
 138
 139 int ast_odbc_smart_execute(struct odbc_obj *obj, SQLHSTMT stmt)
 140 {
 141         int res = 0, i;
 142         SQLINTEGER nativeerror=0, numfields=0;
 143         SQLSMALLINT diagbytes=0;
 144         unsigned char state[10], diagnostic[256];
 145
 146         res = SQLExecute(stmt);
 147         if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO) && (res != SQL_NO_DATA)) {
 148                 if (res == SQL_ERROR) {
 149                         SQLGetDiagField(SQL_HANDLE_STMT, stmt, 1, SQL_DIAG_NUMBER, &numfields, SQL_IS_INTEGER, &diagbytes);
 150                         for (i = 0; i < numfields; i++) {
 151                                 SQLGetDiagRec(SQL_HANDLE_STMT, stmt, i + 1, state, &nativeerror, diagnostic, sizeof(diagnostic), &diagbytes);
 152                                 ast_log(LOG_WARNING, "SQL Execute returned an error %d: %s: %s (%d)\n", res, state, diagnostic, diagbytes);
 153                                 if (i > 10) {
 154                                         ast_log(LOG_WARNING, "Oh, that was good.  There are really %d diagnostics?\n", (int)numfields);
 155                                         break;
 156                                 }
 157                         }
 158                 }
 159 #if 0
 160                 /* This is a really bad method of trying to correct a dead connection.  It
 161                  * only ever really worked with MySQL.  It will not work with any other
 162                  * database, since most databases prepare their statements on the server,
 163                  * and if you disconnect, you invalidate the statement handle.  Hence, if
 164                  * you disconnect, you're going to fail anyway, whether you try to execute
 165                  * a second time or not.
 166                  */
 167                 ast_log(LOG_WARNING, "SQL Execute error %d! Attempting a reconnect...\n", res);
 168                 ast_mutex_lock(&obj->lock);
 169                 obj->up = 0;
 170                 ast_mutex_unlock(&obj->lock);
 171                 odbc_obj_disconnect(obj);
 172                 odbc_obj_connect(obj);
 173                 res = SQLExecute(stmt);
 174 #endif
 175         } else
 176                 obj->last_used = ast_tvnow();
 177
 178         return res;
 179 }
 180
 181
 182 int ast_odbc_sanity_check(struct odbc_obj *obj)
 183 {
 184         char *test_sql = "select 1";
 185         SQLHSTMT stmt;
 186         int res = 0;
 187
 188         if (obj->up) {
 189                 res = SQLAllocHandle(SQL_HANDLE_STMT, obj->con, &stmt);
 190                 if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
 191                         obj->up = 0;
 192                 } else {
 193                         res = SQLPrepare(stmt, (unsigned char *)test_sql, SQL_NTS);
 194                         if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
 195                                 obj->up = 0;
 196                         } else {
 197                                 res = SQLExecute(stmt);
 198                                 if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
 199                                         obj->up = 0;
 200                                 }
 201                         }
 202                 }
 203                 SQLFreeHandle (SQL_HANDLE_STMT, stmt);
 204         }
 205
 206         if (!obj->up) { /* Try to reconnect! */
 207                 ast_log(LOG_WARNING, "Connection is down attempting to reconnect...\n");
 208                 odbc_obj_disconnect(obj);
 209                 odbc_obj_connect(obj);
 210         }
 211         return obj->up;
 212 }
 213
 214 static int load_odbc_config(void)
 215 {
 216         static char *cfg = "res_odbc.conf";
 217         struct ast_config *config;
 218         struct ast_variable *v;
 219         char *cat, *dsn, *username, *password;
 220         int enabled, pooling, limit, bse;
 221         unsigned int idlecheck;
 222         int connect = 0, res = 0;
 223
 224         struct odbc_class *new;
 225
 226         config = ast_config_load(cfg);
 227         if (!config) {
 228                 ast_log(LOG_WARNING, "Unable to load config file res_odbc.conf\n");
 229                 return -1;
 230         }
 231         for (cat = ast_category_browse(config, NULL); cat; cat=ast_category_browse(config, cat)) {
 232                 if (!strcasecmp(cat, "ENV")) {
 233                         for (v = ast_variable_browse(config, cat); v; v = v->next) {
 234                                 setenv(v->name, v->value, 1);
 235                                 ast_log(LOG_NOTICE, "Adding ENV var: %s=%s\n", v->name, v->value);
 236                         }
 237                 } else {
 238                         /* Reset all to defaults for each class of odbc connections */
 239                         dsn = username = password = NULL;
 240                         enabled = 1;
 241                         connect = idlecheck = 0;
 242                         pooling = 0;
 243                         limit = 0;
 244                         bse = 1;
 245                         for (v = ast_variable_browse(config, cat); v; v = v->next) {
 246                                 if (!strcasecmp(v->name, "pooling")) {
 247                                         if (ast_true(v->value))
 248                                                 pooling = 1;
 249                                 } else if (!strcasecmp(v->name, "limit")) {
 250                                         sscanf(v->value, "%d", &limit);
 251                                         if (ast_true(v->value) && !limit) {
 252                                                 ast_log(LOG_WARNING, "Limit should be a number, not a boolean: '%s'.  Setting limit to 1023 for ODBC class '%s'.\n", v->value, cat);
 253                                                 limit = 1023;
 254                                         } else if (ast_false(v->value)) {
 255                                                 ast_log(LOG_WARNING, "Limit should be a number, not a boolean: '%s'.  Disabling ODBC class '%s'.\n", v->value, cat);
 256                                                 enabled = 0;
 257                                                 break;
 258                                         }
 259                                 } else if (!strcasecmp(v->name, "idlecheck")) {
 260                                         sscanf(v->value, "%d", &idlecheck);
 261                                 } else if (!strcasecmp(v->name, "enabled")) {
 262                                         enabled = ast_true(v->value);
 263                                 } else if (!strcasecmp(v->name, "pre-connect")) {
 264                                         connect = ast_true(v->value);
 265                                 } else if (!strcasecmp(v->name, "dsn")) {
 266                                         dsn = v->value;
 267                                 } else if (!strcasecmp(v->name, "username")) {
 268                                         username = v->value;
 269                                 } else if (!strcasecmp(v->name, "password")) {
 270                                         password = v->value;
 271                                 } else if (!strcasecmp(v->name, "backslash_is_escape")) {
 272                                         bse = ast_true(v->value);
 273                                 }
 274                         }
 275
 276                         if (enabled && !ast_strlen_zero(dsn)) {
 277                                 new = ast_calloc(1, sizeof(*new));
 278
 279                                 if (!new) {
 280                                         res = -1;
 281                                         break;
 282                                 }
 283
 284                                 if (cat)
 285                                         ast_copy_string(new->name, cat, sizeof(new->name));
 286                                 if (dsn)
 287                                         ast_copy_string(new->dsn, dsn, sizeof(new->dsn));
 288                                 if (username)
 289                                         ast_copy_string(new->username, username, sizeof(new->username));
 290                                 if (password)
 291                                         ast_copy_string(new->password, password, sizeof(new->password));
 292
 293                                 SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &new->env);
 294                                 res = SQLSetEnvAttr(new->env, SQL_ATTR_ODBC_VERSION, (void *) SQL_OV_ODBC3, 0);
 295
 296                                 if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
 297                                         ast_log(LOG_WARNING, "res_odbc: Error SetEnv\n");
 298                                         SQLFreeHandle(SQL_HANDLE_ENV, new->env);
 299                                         return res;
 300                                 }
 301
 302                                 if (pooling) {
 303                                         new->haspool = pooling;
 304                                         if (limit) {
 305                                                 new->limit = limit;
 306                                         } else {
 307                                                 ast_log(LOG_WARNING, "Pooling without also setting a limit is pointless.  Changing limit from 0 to 5.\n");
 308                                                 new->limit = 5;
 309                                         }
 310                                 }
 311
 312                                 new->backslash_is_escape = bse ? 1 : 0;
 313                                 new->idlecheck = idlecheck;
 314
 315                                 odbc_register_class(new, connect);
 316                                 ast_log(LOG_NOTICE, "Registered ODBC class '%s' dsn->[%s]\n", cat, dsn);
 317                         }
 318                 }
 319         }
 320         ast_config_destroy(config);
 321         return res;
 322 }
 323
 324 static int odbc_show_command(int fd, int argc, char **argv)
 325 {
 326         struct odbc_class *class;
 327         struct odbc_obj *current;
 328
 329         AST_LIST_LOCK(&odbc_list);
 330         AST_LIST_TRAVERSE(&odbc_list, class, list) {
 331                 if ((argc == 2) || (argc == 3 && !strcmp(argv[2], "all")) || (!strcmp(argv[2], class->name))) {
 332                         int count = 0;
 333                         ast_cli(fd, "Name: %s\nDSN: %s\n", class->name, class->dsn);
 334
 335                         if (class->haspool) {
 336                                 ast_cli(fd, "Pooled: yes\nLimit: %d\nConnections in use: %d\n", class->limit, class->count);
 337
 338                                 AST_LIST_TRAVERSE(&(class->odbc_obj), current, list) {
 339                                         ast_cli(fd, "  Connection %d: %s\n", ++count, current->used ? "in use" : current->up && ast_odbc_sanity_check(current) ? "connected" : "disconnected");
 340                                 }
 341                         } else {
 342                                 /* Should only ever be one of these */
 343                                 AST_LIST_TRAVERSE(&(class->odbc_obj), current, list) {
 344                                         ast_cli(fd, "Pooled: no\nConnected: %s\n", current->up && ast_odbc_sanity_check(current) ? "yes" : "no");
 345                                 }
 346                         }
 347
 348                                 ast_cli(fd, "\n");
 349                 }
 350         }
 351         AST_LIST_UNLOCK(&odbc_list);
 352
 353         return 0;
 354 }
 355
 356 static char show_usage[] =
 357 "Usage: odbc show [<class>]\n"
 358 "       List settings of a particular ODBC class.\n"
 359 "       or, if not specified, all classes.\n";
 360
 361 static struct ast_cli_entry cli_odbc[] = {
 362         { { "odbc", "show", NULL },
 363         odbc_show_command, "List ODBC DSN(s)",
 364         show_usage },
 365 };
 366
 367 static int odbc_register_class(struct odbc_class *class, int connect)
 368 {
 369         struct odbc_obj *obj;
 370         if (class) {
 371                 AST_LIST_LOCK(&odbc_list);
 372                 AST_LIST_INSERT_HEAD(&odbc_list, class, list);
 373                 AST_LIST_UNLOCK(&odbc_list);
 374
 375                 if (connect) {
 376                         /* Request and release builds a connection */
 377                         obj = ast_odbc_request_obj(class->name, 0);
 378                         if (obj)
 379                                 ast_odbc_release_obj(obj);
 380                 }
 381
 382                 return 0;
 383         } else {
 384                 ast_log(LOG_WARNING, "Attempted to register a NULL class?\n");
 385                 return -1;
 386         }
 387 }
 388
 389 void ast_odbc_release_obj(struct odbc_obj *obj)
 390 {
 391         /* For pooled connections, this frees the connection to be
 392          * reused.  For non-pooled connections, it does nothing. */
 393         obj->used = 0;
 394 }
 395
 396 int ast_odbc_backslash_is_escape(struct odbc_obj *obj)
 397 {
 398         return obj->parent->backslash_is_escape;
 399 }
 400
 401 struct odbc_obj *ast_odbc_request_obj(const char *name, int check)
 402 {
 403         struct odbc_obj *obj = NULL;
 404         struct odbc_class *class;
 405
 406         AST_LIST_LOCK(&odbc_list);
 407         AST_LIST_TRAVERSE(&odbc_list, class, list) {
 408                 if (!strcmp(class->name, name))
 409                         break;
 410         }
 411         AST_LIST_UNLOCK(&odbc_list);
 412
 413         if (!class)
 414                 return NULL;
 415
 416         AST_LIST_LOCK(&class->odbc_obj);
 417         if (class->haspool) {
 418                 /* Recycle connections before building another */
 419                 AST_LIST_TRAVERSE(&class->odbc_obj, obj, list) {
 420                         if (! obj->used) {
 421                                 obj->used = 1;
 422                                 break;
 423                         }
 424                 }
 425
 426                 if (!obj && (class->count < class->limit)) {
 427                         class->count++;
 428                         obj = ast_calloc(1, sizeof(*obj));
 429                         if (!obj) {
 430                                 AST_LIST_UNLOCK(&class->odbc_obj);
 431                                 return NULL;
 432                         }
 433                         ast_mutex_init(&obj->lock);
 434                         obj->parent = class;
 435                         if (odbc_obj_connect(obj) == ODBC_FAIL) {
 436                                 ast_log(LOG_WARNING, "Failed to connect to %s\n", name);
 437                                 ast_mutex_destroy(&obj->lock);
 438                                 free(obj);
 439                                 obj = NULL;
 440                                 class->count--;
 441                         } else {
 442                                 obj->used = 1;
 443                                 AST_LIST_INSERT_TAIL(&class->odbc_obj, obj, list);
 444                         }
 445                 }
 446         } else {
 447                 /* Non-pooled connection: multiple modules can use the same connection. */
 448                 AST_LIST_TRAVERSE(&class->odbc_obj, obj, list) {
 449                         /* Non-pooled connection: if there is an entry, return it */
 450                         break;
 451                 }
 452
 453                 if (!obj) {
 454                         /* No entry: build one */
 455                         obj = ast_calloc(1, sizeof(*obj));
 456                         if (!obj) {
 457                                 AST_LIST_UNLOCK(&class->odbc_obj);
 458                                 return NULL;
 459                         }
 460                         ast_mutex_init(&obj->lock);
 461                         obj->parent = class;
 462                         if (odbc_obj_connect(obj) == ODBC_FAIL) {
 463                                 ast_log(LOG_WARNING, "Failed to connect to %s\n", name);
 464                                 ast_mutex_destroy(&obj->lock);
 465                                 free(obj);
 466                                 obj = NULL;
 467                         } else {
 468                                 AST_LIST_INSERT_HEAD(&class->odbc_obj, obj, list);
 469                         }
 470                 }
 471         }
 472         AST_LIST_UNLOCK(&class->odbc_obj);
 473
 474         if (obj && check) {
 475                 ast_odbc_sanity_check(obj);
 476         } else if (obj && obj->parent->idlecheck > 0 && ast_tvdiff_ms(ast_tvnow(), obj->last_used) / 1000 > obj->parent->idlecheck)
 477                 odbc_obj_connect(obj);
 478
 479         return obj;
 480 }
 481
 482 static odbc_status odbc_obj_disconnect(struct odbc_obj *obj)
 483 {
 484         int res;
 485         ast_mutex_lock(&obj->lock);
 486
 487         res = SQLDisconnect(obj->con);
 488
 489         if (res == ODBC_SUCCESS) {
 490                 ast_log(LOG_WARNING, "res_odbc: disconnected %d from %s [%s]\n", res, obj->parent->name, obj->parent->dsn);
 491         } else {
 492                 ast_log(LOG_WARNING, "res_odbc: %s [%s] already disconnected\n",
 493                 obj->parent->name, obj->parent->dsn);
 494         }
 495         obj->up = 0;
 496         ast_mutex_unlock(&obj->lock);
 497         return ODBC_SUCCESS;
 498 }
 499
 500 static odbc_status odbc_obj_connect(struct odbc_obj *obj)
 501 {
 502         int res;
 503         SQLINTEGER err;
 504         short int mlen;
 505         unsigned char msg[200], stat[10];
 506 #ifdef NEEDTRACE
 507         SQLINTEGER enable = 1;
 508         char *tracefile = "/tmp/odbc.trace";
 509 #endif
 510         ast_mutex_lock(&obj->lock);
 511
 512         res = SQLAllocHandle(SQL_HANDLE_DBC, obj->parent->env, &obj->con);
 513
 514         if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
 515                 ast_log(LOG_WARNING, "res_odbc: Error AllocHDB %d\n", res);
 516                 ast_mutex_unlock(&obj->lock);
 517                 return ODBC_FAIL;
 518         }
 519         SQLSetConnectAttr(obj->con, SQL_LOGIN_TIMEOUT, (SQLPOINTER *) 10, 0);
 520         SQLSetConnectAttr(obj->con, SQL_ATTR_CONNECTION_TIMEOUT, (SQLPOINTER *) 10, 0);
 521 #ifdef NEEDTRACE
 522         SQLSetConnectAttr(obj->con, SQL_ATTR_TRACE, &enable, SQL_IS_INTEGER);
 523         SQLSetConnectAttr(obj->con, SQL_ATTR_TRACEFILE, tracefile, strlen(tracefile));
 524 #endif
 525
 526         if (obj->up) {
 527                 odbc_obj_disconnect(obj);
 528                 ast_log(LOG_NOTICE, "Re-connecting %s\n", obj->parent->name);
 529         } else {
 530                 ast_log(LOG_NOTICE, "Connecting %s\n", obj->parent->name);
 531         }
 532
 533         res = SQLConnect(obj->con,
 534                    (SQLCHAR *) obj->parent->dsn, SQL_NTS,
 535                    (SQLCHAR *) obj->parent->username, SQL_NTS,
 536                    (SQLCHAR *) obj->parent->password, SQL_NTS);
 537
 538         if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
 539                 SQLGetDiagRec(SQL_HANDLE_DBC, obj->con, 1, stat, &err, msg, 100, &mlen);
 540                 ast_mutex_unlock(&obj->lock);
 541                 ast_log(LOG_WARNING, "res_odbc: Error SQLConnect=%d errno=%d %s\n", res, (int)err, msg);
 542                 return ODBC_FAIL;
 543         } else {
 544                 ast_log(LOG_NOTICE, "res_odbc: Connected to %s [%s]\n", obj->parent->name, obj->parent->dsn);
 545                 obj->up = 1;
 546                 obj->last_used = ast_tvnow();
 547         }
 548
 549         ast_mutex_unlock(&obj->lock);
 550         return ODBC_SUCCESS;
 551 }
 552
 553 static int reload(void)
 554 {
 555         static char *cfg = "res_odbc.conf";
 556         struct ast_config *config;
 557         struct ast_variable *v;
 558         char *cat, *dsn, *username, *password;
 559         int enabled, pooling, limit, bse;
 560         unsigned int idlecheck;
 561         int connect = 0, res = 0;
 562
 563         struct odbc_class *new, *class;
 564         struct odbc_obj *current;
 565
 566         /* First, mark all to be purged */
 567         AST_LIST_LOCK(&odbc_list);
 568         AST_LIST_TRAVERSE(&odbc_list, class, list) {
 569                 class->delme = 1;
 570         }
 571
 572         config = ast_config_load(cfg);
 573         if (config) {
 574                 for (cat = ast_category_browse(config, NULL); cat; cat=ast_category_browse(config, cat)) {
 575                         if (!strcasecmp(cat, "ENV")) {
 576                                 for (v = ast_variable_browse(config, cat); v; v = v->next) {
 577                                         setenv(v->name, v->value, 1);
 578                                         ast_log(LOG_NOTICE, "Adding ENV var: %s=%s\n", v->name, v->value);
 579                                 }
 580                         } else {
 581                                 /* Reset all to defaults for each class of odbc connections */
 582                                 dsn = username = password = NULL;
 583                                 enabled = 1;
 584                                 connect = idlecheck = 0;
 585                                 pooling = 0;
 586                                 limit = 0;
 587                                 bse = 1;
 588                                 for (v = ast_variable_browse(config, cat); v; v = v->next) {
 589                                         if (!strcasecmp(v->name, "pooling")) {
 590                                                 pooling = 1;
 591                                         } else if (!strcasecmp(v->name, "limit")) {
 592                                                 sscanf(v->value, "%d", &limit);
 593                                                 if (ast_true(v->value) && !limit) {
 594                                                         ast_log(LOG_WARNING, "Limit should be a number, not a boolean: '%s'.  Setting limit to 1023 for ODBC class '%s'.\n", v->value, cat);
 595                                                         limit = 1023;
 596                                                 } else if (ast_false(v->value)) {
 597                                                         ast_log(LOG_WARNING, "Limit should be a number, not a boolean: '%s'.  Disabling ODBC class '%s'.\n", v->value, cat);
 598                                                         enabled = 0;
 599                                                         break;
 600                                                 }
 601                                         } else if (!strcasecmp(v->name, "idlecheck")) {
 602                                                 sscanf(v->value, "%ud", &idlecheck);
 603                                         } else if (!strcasecmp(v->name, "enabled")) {
 604                                                 enabled = ast_true(v->value);
 605                                         } else if (!strcasecmp(v->name, "pre-connect")) {
 606                                                 connect = ast_true(v->value);
 607                                         } else if (!strcasecmp(v->name, "dsn")) {
 608                                                 dsn = v->value;
 609                                         } else if (!strcasecmp(v->name, "username")) {
 610                                                 username = v->value;
 611                                         } else if (!strcasecmp(v->name, "password")) {
 612                                                 password = v->value;
 613                                         } else if (!strcasecmp(v->name, "backslash_is_escape")) {
 614                                                 bse = ast_true(v->value);
 615                                         }
 616                                 }
 617
 618                                 if (enabled && !ast_strlen_zero(dsn)) {
 619                                         /* First, check the list to see if it already exists */
 620                                         AST_LIST_TRAVERSE(&odbc_list, class, list) {
 621                                                 if (!strcmp(class->name, cat)) {
 622                                                         class->delme = 0;
 623                                                         break;
 624                                                 }
 625                                         }
 626
 627                                         if (class) {
 628                                                 new = class;
 629                                         } else {
 630                                                 new = ast_calloc(1, sizeof(*new));
 631                                         }
 632
 633                                         if (!new) {
 634                                                 res = -1;
 635                                                 break;
 636                                         }
 637
 638                                         if (cat)
 639                                                 ast_copy_string(new->name, cat, sizeof(new->name));
 640                                         if (dsn)
 641                                                 ast_copy_string(new->dsn, dsn, sizeof(new->dsn));
 642                                         if (username)
 643                                                 ast_copy_string(new->username, username, sizeof(new->username));
 644                                         if (password)
 645                                                 ast_copy_string(new->password, password, sizeof(new->password));
 646
 647                                         if (!class) {
 648                                                 SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &new->env);
 649                                                 res = SQLSetEnvAttr(new->env, SQL_ATTR_ODBC_VERSION, (void *) SQL_OV_ODBC3, 0);
 650
 651                                                 if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
 652                                                         ast_log(LOG_WARNING, "res_odbc: Error SetEnv\n");
 653                                                         SQLFreeHandle(SQL_HANDLE_ENV, new->env);
 654                                                         AST_LIST_UNLOCK(&odbc_list);
 655                                                         return res;
 656                                                 }
 657                                         }
 658
 659                                         if (pooling) {
 660                                                 new->haspool = pooling;
 661                                                 if (limit) {
 662                                                         new->limit = limit;
 663                                                 } else {
 664                                                         ast_log(LOG_WARNING, "Pooling without also setting a limit is pointless.  Changing limit from 0 to 5.\n");
 665                                                         new->limit = 5;
 666                                                 }
 667                                         }
 668
 669                                         new->backslash_is_escape = bse;
 670                                         new->idlecheck = idlecheck;
 671
 672                                         if (class) {
 673                                                 ast_log(LOG_NOTICE, "Refreshing ODBC class '%s' dsn->[%s]\n", cat, dsn);
 674                                         } else {
 675                                                 odbc_register_class(new, connect);
 676                                                 ast_log(LOG_NOTICE, "Registered ODBC class '%s' dsn->[%s]\n", cat, dsn);
 677                                         }
 678                                 }
 679                         }
 680                 }
 681                 ast_config_destroy(config);
 682         }
 683
 684         /* Purge classes that we know can go away (pooled with 0, only) */
 685         AST_LIST_TRAVERSE_SAFE_BEGIN(&odbc_list, class, list) {
 686                 if (class->delme && class->haspool && class->count == 0) {
 687                         AST_LIST_TRAVERSE_SAFE_BEGIN(&(class->odbc_obj), current, list) {
 688                                 AST_LIST_REMOVE_CURRENT(&(class->odbc_obj), list);
 689                                 odbc_obj_disconnect(current);
 690                                 ast_mutex_destroy(&current->lock);
 691                                 free(current);
 692                         }
 693                         AST_LIST_TRAVERSE_SAFE_END;
 694
 695                         AST_LIST_REMOVE_CURRENT(&odbc_list, list);
 696                         free(class);
 697                 }
 698         }
 699         AST_LIST_TRAVERSE_SAFE_END;
 700         AST_LIST_UNLOCK(&odbc_list);
 701
 702         return 0;
 703 }
 704
 705 static int unload_module(void)
 706 {
 707         /* Prohibit unloading */
 708         return -1;
 709 }
 710
 711 static int load_module(void)
 712 {
 713         if(load_odbc_config() == -1)
 714                 return AST_MODULE_LOAD_DECLINE;
 715         ast_cli_register_multiple(cli_odbc, sizeof(cli_odbc) / sizeof(struct ast_cli_entry));
 716         ast_log(LOG_NOTICE, "res_odbc loaded.\n");
 717         return 0;
 718 }
 719
 720 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS, "ODBC Resource",
 721                 .load = load_module,
 722                 .unload = unload_module,
 723                 .reload = reload,
 724                );