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
  57 struct odbc_class
  58 {
  59         AST_LIST_ENTRY(odbc_class) list;
  60         char name[80];
  61         char dsn[80];
  62         char username[80];
  63         char password[80];
  64         char sanitysql[256];
  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         AST_LIST_HEAD(, odbc_obj) odbc_obj;
  71 };
  72
  73 AST_LIST_HEAD_STATIC(odbc_list, odbc_class);
  74
  75 static odbc_status odbc_obj_connect(struct odbc_obj *obj);
  76 static odbc_status odbc_obj_disconnect(struct odbc_obj *obj);
  77 static int odbc_register_class(struct odbc_class *class, int connect);
  78
  79
  80 SQLHSTMT ast_odbc_direct_execute(struct odbc_obj *obj, SQLHSTMT (*exec_cb)(struct odbc_obj *obj, void *data), void *data)
  81 {
  82         int attempt;
  83         SQLHSTMT stmt;
  84
  85         for (attempt = 0; attempt < 2; attempt++) {
  86                 stmt = exec_cb(obj, data);
  87
  88                 if (stmt) {
  89                         break;
  90                 } else {
  91                         obj->up = 0;
  92                         ast_log(LOG_WARNING, "SQL Exec Direct failed.  Attempting a reconnect...\n");
  93
  94                         odbc_obj_disconnect(obj);
  95                         odbc_obj_connect(obj);
  96                 }
  97         }
  98
  99         return stmt;
 100 }
 101
 102 SQLHSTMT ast_odbc_prepare_and_execute(struct odbc_obj *obj, SQLHSTMT (*prepare_cb)(struct odbc_obj *obj, void *data), void *data)
 103 {
 104         int res = 0, i, attempt;
 105         SQLINTEGER nativeerror=0, numfields=0;
 106         SQLSMALLINT diagbytes=0;
 107         unsigned char state[10], diagnostic[256];
 108         SQLHSTMT stmt;
 109
 110         for (attempt = 0; attempt < 2; attempt++) {
 111                 /* This prepare callback may do more than just prepare -- it may also
 112                  * bind parameters, bind results, etc.  The real key, here, is that
 113                  * when we disconnect, all handles become invalid for most databases.
 114                  * We must therefore redo everything when we establish a new
 115                  * connection. */
 116                 stmt = prepare_cb(obj, data);
 117
 118                 if (stmt) {
 119                         res = SQLExecute(stmt);
 120                         if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO) && (res != SQL_NO_DATA)) {
 121                                 if (res == SQL_ERROR) {
 122                                         SQLGetDiagField(SQL_HANDLE_STMT, stmt, 1, SQL_DIAG_NUMBER, &numfields, SQL_IS_INTEGER, &diagbytes);
 123                                         for (i = 0; i < numfields; i++) {
 124                                                 SQLGetDiagRec(SQL_HANDLE_STMT, stmt, i + 1, state, &nativeerror, diagnostic, sizeof(diagnostic), &diagbytes);
 125                                                 ast_log(LOG_WARNING, "SQL Execute returned an error %d: %s: %s (%d)\n", res, state, diagnostic, diagbytes);
 126                                                 if (i > 10) {
 127                                                         ast_log(LOG_WARNING, "Oh, that was good.  There are really %d diagnostics?\n", (int)numfields);
 128                                                         break;
 129                                                 }
 130                                         }
 131                                 }
 132
 133                                 ast_log(LOG_WARNING, "SQL Execute error %d! Attempting a reconnect...\n", res);
 134                                 SQLFreeHandle(SQL_HANDLE_STMT, stmt);
 135                                 stmt = NULL;
 136
 137                                 obj->up = 0;
 138                                 /*
 139                                  * While this isn't the best way to try to correct an error, this won't automatically
 140                                  * fail when the statement handle invalidates.
 141                                  */
 142                                 ast_odbc_sanity_check(obj);
 143                                 continue;
 144                         }
 145                         break;
 146                 } else if (attempt == 0)
 147                         ast_odbc_sanity_check(obj);
 148         }
 149
 150         return stmt;
 151 }
 152
 153 int ast_odbc_smart_execute(struct odbc_obj *obj, SQLHSTMT stmt)
 154 {
 155         int res = 0, i;
 156         SQLINTEGER nativeerror=0, numfields=0;
 157         SQLSMALLINT diagbytes=0;
 158         unsigned char state[10], diagnostic[256];
 159
 160         res = SQLExecute(stmt);
 161         if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO) && (res != SQL_NO_DATA)) {
 162                 if (res == SQL_ERROR) {
 163                         SQLGetDiagField(SQL_HANDLE_STMT, stmt, 1, SQL_DIAG_NUMBER, &numfields, SQL_IS_INTEGER, &diagbytes);
 164                         for (i = 0; i < numfields; i++) {
 165                                 SQLGetDiagRec(SQL_HANDLE_STMT, stmt, i + 1, state, &nativeerror, diagnostic, sizeof(diagnostic), &diagbytes);
 166                                 ast_log(LOG_WARNING, "SQL Execute returned an error %d: %s: %s (%d)\n", res, state, diagnostic, diagbytes);
 167                                 if (i > 10) {
 168                                         ast_log(LOG_WARNING, "Oh, that was good.  There are really %d diagnostics?\n", (int)numfields);
 169                                         break;
 170                                 }
 171                         }
 172                 }
 173 #if 0
 174                 /* This is a really bad method of trying to correct a dead connection.  It
 175                  * only ever really worked with MySQL.  It will not work with any other
 176                  * database, since most databases prepare their statements on the server,
 177                  * and if you disconnect, you invalidate the statement handle.  Hence, if
 178                  * you disconnect, you're going to fail anyway, whether you try to execute
 179                  * a second time or not.
 180                  */
 181                 ast_log(LOG_WARNING, "SQL Execute error %d! Attempting a reconnect...\n", res);
 182                 ast_mutex_lock(&obj->lock);
 183                 obj->up = 0;
 184                 ast_mutex_unlock(&obj->lock);
 185                 odbc_obj_disconnect(obj);
 186                 odbc_obj_connect(obj);
 187                 res = SQLExecute(stmt);
 188 #endif
 189         }
 190
 191         return res;
 192 }
 193
 194
 195 int ast_odbc_sanity_check(struct odbc_obj *obj)
 196 {
 197         char *test_sql = "select 1";
 198         SQLHSTMT stmt;
 199         int res = 0;
 200
 201         if (!ast_strlen_zero(obj->parent->sanitysql))
 202                 test_sql = obj->parent->sanitysql;
 203
 204         if (obj->up) {
 205                 res = SQLAllocHandle(SQL_HANDLE_STMT, obj->con, &stmt);
 206                 if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
 207                         obj->up = 0;
 208                 } else {
 209                         res = SQLPrepare(stmt, (unsigned char *)test_sql, SQL_NTS);
 210                         if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
 211                                 obj->up = 0;
 212                         } else {
 213                                 res = SQLExecute(stmt);
 214                                 if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
 215                                         obj->up = 0;
 216                                 }
 217                         }
 218                 }
 219                 SQLFreeHandle (SQL_HANDLE_STMT, stmt);
 220         }
 221
 222         if (!obj->up) { /* Try to reconnect! */
 223                 ast_log(LOG_WARNING, "Connection is down attempting to reconnect...\n");
 224                 odbc_obj_disconnect(obj);
 225                 odbc_obj_connect(obj);
 226         }
 227         return obj->up;
 228 }
 229
 230 static int load_odbc_config(void)
 231 {
 232         static char *cfg = "res_odbc.conf";
 233         struct ast_config *config;
 234         struct ast_variable *v;
 235         char *cat, *dsn, *username, *password, *sanitysql;
 236         int enabled, pooling, limit;
 237         int connect = 0, res = 0;
 238         struct ast_flags config_flags = { 0 };
 239
 240         struct odbc_class *new;
 241
 242         config = ast_config_load(cfg, config_flags);
 243         if (!config) {
 244                 ast_log(LOG_WARNING, "Unable to load config file res_odbc.conf\n");
 245                 return -1;
 246         }
 247         for (cat = ast_category_browse(config, NULL); cat; cat=ast_category_browse(config, cat)) {
 248                 if (!strcasecmp(cat, "ENV")) {
 249                         for (v = ast_variable_browse(config, cat); v; v = v->next) {
 250                                 setenv(v->name, v->value, 1);
 251                                 ast_log(LOG_NOTICE, "Adding ENV var: %s=%s\n", v->name, v->value);
 252                         }
 253                 } else {
 254                         /* Reset all to defaults for each class of odbc connections */
 255                         dsn = username = password = sanitysql = NULL;
 256                         enabled = 1;
 257                         connect = 0;
 258                         pooling = 0;
 259                         limit = 0;
 260                         for (v = ast_variable_browse(config, cat); v; v = v->next) {
 261                                 if (!strcasecmp(v->name, "pooling")) {
 262                                         if (ast_true(v->value))
 263                                                 pooling = 1;
 264                                 } else if (!strcasecmp(v->name, "limit")) {
 265                                         sscanf(v->value, "%d", &limit);
 266                                         if (ast_true(v->value) && !limit) {
 267                                                 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);
 268                                                 limit = 1023;
 269                                         } else if (ast_false(v->value)) {
 270                                                 ast_log(LOG_WARNING, "Limit should be a number, not a boolean: '%s'.  Disabling ODBC class '%s'.\n", v->value, cat);
 271                                                 enabled = 0;
 272                                                 break;
 273                                         }
 274                                 } else if (!strcasecmp(v->name, "enabled")) {
 275                                         enabled = ast_true(v->value);
 276                                 } else if (!strcasecmp(v->name, "pre-connect")) {
 277                                         connect = ast_true(v->value);
 278                                 } else if (!strcasecmp(v->name, "dsn")) {
 279                                         dsn = v->value;
 280                                 } else if (!strcasecmp(v->name, "username")) {
 281                                         username = v->value;
 282                                 } else if (!strcasecmp(v->name, "password")) {
 283                                         password = v->value;
 284                                 } else if (!strcasecmp(v->name, "sanitysql")) {
 285                                         sanitysql = v->value;
 286                                 }
 287                         }
 288
 289                         if (enabled && !ast_strlen_zero(dsn)) {
 290                                 new = ast_calloc(1, sizeof(*new));
 291
 292                                 if (!new) {
 293                                         res = -1;
 294                                         break;
 295                                 }
 296
 297                                 if (cat)
 298                                         ast_copy_string(new->name, cat, sizeof(new->name));
 299                                 if (dsn)
 300                                         ast_copy_string(new->dsn, dsn, sizeof(new->dsn));
 301                                 if (username)
 302                                         ast_copy_string(new->username, username, sizeof(new->username));
 303                                 if (password)
 304                                         ast_copy_string(new->password, password, sizeof(new->password));
 305                                 if (sanitysql)
 306                                         ast_copy_string(new->sanitysql, sanitysql, sizeof(new->sanitysql));
 307
 308                                 SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &new->env);
 309                                 res = SQLSetEnvAttr(new->env, SQL_ATTR_ODBC_VERSION, (void *) SQL_OV_ODBC3, 0);
 310
 311                                 if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
 312                                         ast_log(LOG_WARNING, "res_odbc: Error SetEnv\n");
 313                                         SQLFreeHandle(SQL_HANDLE_ENV, new->env);
 314                                         return res;
 315                                 }
 316
 317                                 if (pooling) {
 318                                         new->haspool = pooling;
 319                                         if (limit) {
 320                                                 new->limit = limit;
 321                                         } else {
 322                                                 ast_log(LOG_WARNING, "Pooling without also setting a limit is pointless.  Changing limit from 0 to 5.\n");
 323                                                 new->limit = 5;
 324                                         }
 325                                 }
 326
 327                                 odbc_register_class(new, connect);
 328                                 ast_log(LOG_NOTICE, "Registered ODBC class '%s' dsn->[%s]\n", cat, dsn);
 329                         }
 330                 }
 331         }
 332         ast_config_destroy(config);
 333         return res;
 334 }
 335
 336 static char *handle_cli_odbc_show(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
 337 {
 338         struct odbc_class *class;
 339         struct odbc_obj *current;
 340         int length = 0;
 341         int which = 0;
 342         char *ret = NULL;
 343
 344         switch (cmd) {
 345         case CLI_INIT:
 346                 e->command = "odbc show";
 347                 e->usage =
 348                                 "Usage: odbc show [class]\n"
 349                                 "       List settings of a particular ODBC class or,\n"
 350                                 "       if not specified, all classes.\n";
 351                 return NULL;
 352         case CLI_GENERATE:
 353                 if (a->pos != 2)
 354                         return NULL;
 355                 length = strlen(a->word);
 356                 AST_LIST_LOCK(&odbc_list);
 357                 AST_LIST_TRAVERSE(&odbc_list, class, list) {
 358                         if (!strncasecmp(a->word, class->name, length) && ++which > a->n) {
 359                                 ret = ast_strdup(class->name);
 360                                 break;
 361                         }
 362                 }
 363                 if (!ret && !strncasecmp(a->word, "all", length) && ++which > a->n) {
 364                         ret = ast_strdup("all");
 365                 }
 366                 AST_LIST_UNLOCK(&odbc_list);
 367                 return ret;
 368         }
 369
 370         ast_cli(a->fd, "\nODBC DSN Settings\n");
 371         ast_cli(a->fd, "-----------------\n\n");
 372         AST_LIST_LOCK(&odbc_list);
 373         AST_LIST_TRAVERSE(&odbc_list, class, list) {
 374                 if ((a->argc == 2) || (a->argc == 3 && !strcmp(a->argv[2], "all")) || (!strcmp(a->argv[2], class->name))) {
 375                         int count = 0;
 376                         ast_cli(a->fd, "  Name:   %s\n  DSN:    %s\n", class->name, class->dsn);
 377
 378                         if (class->haspool) {
 379                                 ast_cli(a->fd, "  Pooled: Yes\n  Limit:  %d\n  Connections in use: %d\n", class->limit, class->count);
 380
 381                                 AST_LIST_TRAVERSE(&(class->odbc_obj), current, list) {
 382                                         ast_cli(a->fd, "    - Connection %d: %s\n", ++count, current->used ? "in use" : current->up && ast_odbc_sanity_check(current) ? "connected" : "disconnected");
 383                                 }
 384                         } else {
 385                                 /* Should only ever be one of these */
 386                                 AST_LIST_TRAVERSE(&(class->odbc_obj), current, list) {
 387                                         ast_cli(a->fd, "  Pooled: No\n  Connected: %s\n", current->up && ast_odbc_sanity_check(current) ? "Yes" : "No");
 388                                 }
 389                         }
 390                         ast_cli(a->fd, "\n");
 391                 }
 392         }
 393         AST_LIST_UNLOCK(&odbc_list);
 394
 395         return CLI_SUCCESS;
 396 }
 397
 398 static struct ast_cli_entry cli_odbc[] = {
 399         AST_CLI_DEFINE(handle_cli_odbc_show, "List ODBC DSN(s)")
 400 };
 401
 402 static int odbc_register_class(struct odbc_class *class, int connect)
 403 {
 404         struct odbc_obj *obj;
 405         if (class) {
 406                 AST_LIST_LOCK(&odbc_list);
 407                 AST_LIST_INSERT_HEAD(&odbc_list, class, list);
 408                 AST_LIST_UNLOCK(&odbc_list);
 409
 410                 if (connect) {
 411                         /* Request and release builds a connection */
 412                         obj = ast_odbc_request_obj(class->name, 0);
 413                         if (obj)
 414                                 ast_odbc_release_obj(obj);
 415                 }
 416
 417                 return 0;
 418         } else {
 419                 ast_log(LOG_WARNING, "Attempted to register a NULL class?\n");
 420                 return -1;
 421         }
 422 }
 423
 424 void ast_odbc_release_obj(struct odbc_obj *obj)
 425 {
 426         /* For pooled connections, this frees the connection to be
 427          * reused.  For non-pooled connections, it does nothing. */
 428         obj->used = 0;
 429 }
 430
 431 struct odbc_obj *ast_odbc_request_obj(const char *name, int check)
 432 {
 433         struct odbc_obj *obj = NULL;
 434         struct odbc_class *class;
 435
 436         AST_LIST_LOCK(&odbc_list);
 437         AST_LIST_TRAVERSE(&odbc_list, class, list) {
 438                 if (!strcmp(class->name, name))
 439                         break;
 440         }
 441         AST_LIST_UNLOCK(&odbc_list);
 442
 443         if (!class)
 444                 return NULL;
 445
 446         AST_LIST_LOCK(&class->odbc_obj);
 447         if (class->haspool) {
 448                 /* Recycle connections before building another */
 449                 AST_LIST_TRAVERSE(&class->odbc_obj, obj, list) {
 450                         if (! obj->used) {
 451                                 obj->used = 1;
 452                                 break;
 453                         }
 454                 }
 455
 456                 if (!obj && (class->count < class->limit)) {
 457                         class->count++;
 458                         obj = ast_calloc(1, sizeof(*obj));
 459                         if (!obj) {
 460                                 AST_LIST_UNLOCK(&class->odbc_obj);
 461                                 return NULL;
 462                         }
 463                         ast_mutex_init(&obj->lock);
 464                         obj->parent = class;
 465                         if (odbc_obj_connect(obj) == ODBC_FAIL) {
 466                                 ast_log(LOG_WARNING, "Failed to connect to %s\n", name);
 467                                 ast_mutex_destroy(&obj->lock);
 468                                 free(obj);
 469                                 obj = NULL;
 470                                 class->count--;
 471                         } else {
 472                                 obj->used = 1;
 473                                 AST_LIST_INSERT_TAIL(&class->odbc_obj, obj, list);
 474                         }
 475                 }
 476         } else {
 477                 /* Non-pooled connection: multiple modules can use the same connection. */
 478                 AST_LIST_TRAVERSE(&class->odbc_obj, obj, list) {
 479                         /* Non-pooled connection: if there is an entry, return it */
 480                         break;
 481                 }
 482
 483                 if (!obj) {
 484                         /* No entry: build one */
 485                         obj = ast_calloc(1, sizeof(*obj));
 486                         if (!obj) {
 487                                 AST_LIST_UNLOCK(&class->odbc_obj);
 488                                 return NULL;
 489                         }
 490                         ast_mutex_init(&obj->lock);
 491                         obj->parent = class;
 492                         if (odbc_obj_connect(obj) == ODBC_FAIL) {
 493                                 ast_log(LOG_WARNING, "Failed to connect to %s\n", name);
 494                                 ast_mutex_destroy(&obj->lock);
 495                                 ast_free(obj);
 496                                 obj = NULL;
 497                         } else {
 498                                 AST_LIST_INSERT_HEAD(&class->odbc_obj, obj, list);
 499                         }
 500                 }
 501         }
 502         AST_LIST_UNLOCK(&class->odbc_obj);
 503
 504         if (obj && check) {
 505                 ast_odbc_sanity_check(obj);
 506         }
 507         return obj;
 508 }
 509
 510 static odbc_status odbc_obj_disconnect(struct odbc_obj *obj)
 511 {
 512         int res;
 513         ast_mutex_lock(&obj->lock);
 514
 515         res = SQLDisconnect(obj->con);
 516
 517         if (res == ODBC_SUCCESS) {
 518                 ast_log(LOG_WARNING, "res_odbc: disconnected %d from %s [%s]\n", res, obj->parent->name, obj->parent->dsn);
 519         } else {
 520                 ast_log(LOG_WARNING, "res_odbc: %s [%s] already disconnected\n",
 521                 obj->parent->name, obj->parent->dsn);
 522         }
 523         obj->up = 0;
 524         ast_mutex_unlock(&obj->lock);
 525         return ODBC_SUCCESS;
 526 }
 527
 528 static odbc_status odbc_obj_connect(struct odbc_obj *obj)
 529 {
 530         int res;
 531         SQLINTEGER err;
 532         short int mlen;
 533         unsigned char msg[200], stat[10];
 534 #ifdef NEEDTRACE
 535         SQLINTEGER enable = 1;
 536         char *tracefile = "/tmp/odbc.trace";
 537 #endif
 538         ast_mutex_lock(&obj->lock);
 539
 540         res = SQLAllocHandle(SQL_HANDLE_DBC, obj->parent->env, &obj->con);
 541
 542         if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
 543                 ast_log(LOG_WARNING, "res_odbc: Error AllocHDB %d\n", res);
 544                 ast_mutex_unlock(&obj->lock);
 545                 return ODBC_FAIL;
 546         }
 547         SQLSetConnectAttr(obj->con, SQL_LOGIN_TIMEOUT, (SQLPOINTER *) 10, 0);
 548 #ifdef NEEDTRACE
 549         SQLSetConnectAttr(obj->con, SQL_ATTR_TRACE, &enable, SQL_IS_INTEGER);
 550         SQLSetConnectAttr(obj->con, SQL_ATTR_TRACEFILE, tracefile, strlen(tracefile));
 551 #endif
 552
 553         if (obj->up) {
 554                 odbc_obj_disconnect(obj);
 555                 ast_log(LOG_NOTICE, "Re-connecting %s\n", obj->parent->name);
 556         } else {
 557                 ast_log(LOG_NOTICE, "Connecting %s\n", obj->parent->name);
 558         }
 559
 560         res = SQLConnect(obj->con,
 561                    (SQLCHAR *) obj->parent->dsn, SQL_NTS,
 562                    (SQLCHAR *) obj->parent->username, SQL_NTS,
 563                    (SQLCHAR *) obj->parent->password, SQL_NTS);
 564
 565         if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
 566                 SQLGetDiagRec(SQL_HANDLE_DBC, obj->con, 1, stat, &err, msg, 100, &mlen);
 567                 ast_mutex_unlock(&obj->lock);
 568                 ast_log(LOG_WARNING, "res_odbc: Error SQLConnect=%d errno=%d %s\n", res, (int)err, msg);
 569                 return ODBC_FAIL;
 570         } else {
 571                 ast_log(LOG_NOTICE, "res_odbc: Connected to %s [%s]\n", obj->parent->name, obj->parent->dsn);
 572                 obj->up = 1;
 573         }
 574
 575         ast_mutex_unlock(&obj->lock);
 576         return ODBC_SUCCESS;
 577 }
 578
 579 static int reload(void)
 580 {
 581         static char *cfg = "res_odbc.conf";
 582         struct ast_config *config;
 583         struct ast_variable *v;
 584         char *cat, *dsn, *username, *password, *sanitysql;
 585         int enabled, pooling, limit;
 586         int connect = 0, res = 0;
 587         struct ast_flags config_flags = { CONFIG_FLAG_FILEUNCHANGED };
 588
 589         struct odbc_class *new, *class;
 590         struct odbc_obj *current;
 591
 592         /* First, mark all to be purged */
 593         AST_LIST_LOCK(&odbc_list);
 594         AST_LIST_TRAVERSE(&odbc_list, class, list) {
 595                 class->delme = 1;
 596         }
 597
 598         config = ast_config_load(cfg, config_flags);
 599         if (config != NULL && config != CONFIG_STATUS_FILEUNCHANGED) {
 600                 for (cat = ast_category_browse(config, NULL); cat; cat=ast_category_browse(config, cat)) {
 601                         if (!strcasecmp(cat, "ENV")) {
 602                                 for (v = ast_variable_browse(config, cat); v; v = v->next) {
 603                                         setenv(v->name, v->value, 1);
 604                                         ast_log(LOG_NOTICE, "Adding ENV var: %s=%s\n", v->name, v->value);
 605                                 }
 606                         } else {
 607                                 /* Reset all to defaults for each class of odbc connections */
 608                                 dsn = username = password = sanitysql = NULL;
 609                                 enabled = 1;
 610                                 connect = 0;
 611                                 pooling = 0;
 612                                 limit = 0;
 613                                 for (v = ast_variable_browse(config, cat); v; v = v->next) {
 614                                         if (!strcasecmp(v->name, "pooling")) {
 615                                                 pooling = 1;
 616                                         } else if (!strcasecmp(v->name, "limit")) {
 617                                                 sscanf(v->value, "%d", &limit);
 618                                                 if (ast_true(v->value) && !limit) {
 619                                                         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);
 620                                                         limit = 1023;
 621                                                 } else if (ast_false(v->value)) {
 622                                                         ast_log(LOG_WARNING, "Limit should be a number, not a boolean: '%s'.  Disabling ODBC class '%s'.\n", v->value, cat);
 623                                                         enabled = 0;
 624                                                         break;
 625                                                 }
 626                                         } else if (!strcasecmp(v->name, "enabled")) {
 627                                                 enabled = ast_true(v->value);
 628                                         } else if (!strcasecmp(v->name, "pre-connect")) {
 629                                                 connect = ast_true(v->value);
 630                                         } else if (!strcasecmp(v->name, "dsn")) {
 631                                                 dsn = v->value;
 632                                         } else if (!strcasecmp(v->name, "username")) {
 633                                                 username = v->value;
 634                                         } else if (!strcasecmp(v->name, "password")) {
 635                                                 password = v->value;
 636                                         } else if (!strcasecmp(v->name, "sanitysql")) {
 637                                                 sanitysql = v->value;
 638                                         }
 639                                 }
 640
 641                                 if (enabled && !ast_strlen_zero(dsn)) {
 642                                         /* First, check the list to see if it already exists */
 643                                         AST_LIST_TRAVERSE(&odbc_list, class, list) {
 644                                                 if (!strcmp(class->name, cat)) {
 645                                                         class->delme = 0;
 646                                                         break;
 647                                                 }
 648                                         }
 649
 650                                         if (class) {
 651                                                 new = class;
 652                                         } else {
 653                                                 new = ast_calloc(1, sizeof(*new));
 654                                         }
 655
 656                                         if (!new) {
 657                                                 res = -1;
 658                                                 break;
 659                                         }
 660
 661                                         if (cat)
 662                                                 ast_copy_string(new->name, cat, sizeof(new->name));
 663                                         if (dsn)
 664                                                 ast_copy_string(new->dsn, dsn, sizeof(new->dsn));
 665                                         if (username)
 666                                                 ast_copy_string(new->username, username, sizeof(new->username));
 667                                         if (password)
 668                                                 ast_copy_string(new->password, password, sizeof(new->password));
 669                                         if (sanitysql)
 670                                                 ast_copy_string(new->sanitysql, sanitysql, sizeof(new->sanitysql));
 671
 672                                         if (!class) {
 673                                                 SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &new->env);
 674                                                 res = SQLSetEnvAttr(new->env, SQL_ATTR_ODBC_VERSION, (void *) SQL_OV_ODBC3, 0);
 675
 676                                                 if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
 677                                                         ast_log(LOG_WARNING, "res_odbc: Error SetEnv\n");
 678                                                         SQLFreeHandle(SQL_HANDLE_ENV, new->env);
 679                                                         AST_LIST_UNLOCK(&odbc_list);
 680                                                         return res;
 681                                                 }
 682                                         }
 683
 684                                         if (pooling) {
 685                                                 new->haspool = pooling;
 686                                                 if (limit) {
 687                                                         new->limit = limit;
 688                                                 } else {
 689                                                         ast_log(LOG_WARNING, "Pooling without also setting a limit is pointless.  Changing limit from 0 to 5.\n");
 690                                                         new->limit = 5;
 691                                                 }
 692                                         }
 693
 694                                         if (class) {
 695                                                 ast_log(LOG_NOTICE, "Refreshing ODBC class '%s' dsn->[%s]\n", cat, dsn);
 696                                         } else {
 697                                                 odbc_register_class(new, connect);
 698                                                 ast_log(LOG_NOTICE, "Registered ODBC class '%s' dsn->[%s]\n", cat, dsn);
 699                                         }
 700                                 }
 701                         }
 702                 }
 703                 ast_config_destroy(config);
 704         }
 705
 706         /* Purge classes that we know can go away (pooled with 0, only) */
 707         AST_LIST_TRAVERSE_SAFE_BEGIN(&odbc_list, class, list) {
 708                 if (class->delme && class->haspool && class->count == 0) {
 709                         while ((current = AST_LIST_REMOVE_HEAD(&class->odbc_obj, list))) {
 710                                 odbc_obj_disconnect(current);
 711                                 ast_mutex_destroy(&current->lock);
 712                                 ast_free(current);
 713                         }
 714
 715                         AST_LIST_REMOVE_CURRENT(list);
 716                         ast_free(class);
 717                 }
 718         }
 719         AST_LIST_TRAVERSE_SAFE_END;
 720         AST_LIST_UNLOCK(&odbc_list);
 721
 722         return 0;
 723 }
 724
 725 static int unload_module(void)
 726 {
 727         /* Prohibit unloading */
 728         return -1;
 729 }
 730
 731 static int load_module(void)
 732 {
 733         if(load_odbc_config() == -1)
 734                 return AST_MODULE_LOAD_DECLINE;
 735         ast_cli_register_multiple(cli_odbc, sizeof(cli_odbc) / sizeof(struct ast_cli_entry));
 736         ast_log(LOG_NOTICE, "res_odbc loaded.\n");
 737         return 0;
 738 }
 739
 740 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS, "ODBC resource",
 741                 .load = load_module,
 742                 .unload = unload_module,
 743                 .reload = reload,
 744                );