cel/cel_pgsql.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 2008
   5  *
   6  * Steve Murphy - adapted to CEL, from:
   7  * Matthew D. Hardeman <mhardemn@papersoft.com>
   8  * Adapted from the MySQL CDR logger originally by James Sharp
   9  *
  10  * Modified April, 2007; Dec, 2008
  11  * Steve Murphy <murf@digium.com>
  12
  13  * Modified September 2003
  14  * Matthew D. Hardeman <mhardemn@papersoft.com>
  15  *
  16  * See http://www.asterisk.org for more information about
  17  * the Asterisk project. Please do not directly contact
  18  * any of the maintainers of this project for assistance;
  19  * the project provides a web site, mailing lists and IRC
  20  * channels for your use.
  21  *
  22  * This program is free software, distributed under the terms of
  23  * the GNU General Public License Version 2. See the LICENSE file
  24  * at the top of the source tree.
  25  */
  26
  27 /*! \file
  28  *
  29  * \brief PostgreSQL CEL logger
  30  *
  31  * \author Steve Murphy <murf@digium.com>
  32  * PostgreSQL http://www.postgresql.org/
  33  *
  34  * See also
  35  * \arg \ref Config_cel
  36  * PostgreSQL http://www.postgresql.org/
  37  * \ingroup cel_drivers
  38  */
  39
  40 /*** MODULEINFO
  41         <depend>pgsql</depend>
  42         <support_level>extended</support_level>
  43  ***/
  44
  45 #include "asterisk.h"
  46
  47 ASTERISK_REGISTER_FILE()
  48
  49 #include <libpq-fe.h>
  50
  51 #include "asterisk/config.h"
  52 #include "asterisk/options.h"
  53 #include "asterisk/channel.h"
  54 #include "asterisk/cel.h"
  55 #include "asterisk/module.h"
  56 #include "asterisk/logger.h"
  57 #include "asterisk.h"
  58
  59 #define DATE_FORMAT "%Y-%m-%d %T.%6q"
  60
  61 #define PGSQL_BACKEND_NAME "CEL PGSQL backend"
  62
  63 static char *config = "cel_pgsql.conf";
  64
  65 static char *pghostname;
  66 static char *pgdbname;
  67 static char *pgdbuser;
  68 static char *pgpassword;
  69 static char *pgappname;
  70 static char *pgdbport;
  71 static char *table;
  72
  73 static int connected = 0;
  74 /* Optimization to reduce number of memory allocations */
  75 static int maxsize = 512, maxsize2 = 512;
  76 static int usegmtime = 0;
  77
  78 /*! \brief show_user_def is off by default */
  79 #define CEL_SHOW_USERDEF_DEFAULT        0
  80
  81 /*! TRUE if we should set the eventtype field to USER_DEFINED on user events. */
  82 static unsigned char cel_show_user_def;
  83
  84 AST_MUTEX_DEFINE_STATIC(pgsql_lock);
  85
  86 static PGconn   *conn = NULL;
  87 static PGresult *result = NULL;
  88
  89 struct columns {
  90         char *name;
  91         char *type;
  92         int len;
  93         unsigned int notnull:1;
  94         unsigned int hasdefault:1;
  95         AST_RWLIST_ENTRY(columns) list;
  96 };
  97
  98 static AST_RWLIST_HEAD_STATIC(psql_columns, columns);
  99
 100 #define LENGTHEN_BUF1(size) \
 101         do { \
 102                 /* Lengthen buffer, if necessary */ \
 103                 if (ast_str_strlen(sql) + size + 1 > ast_str_size(sql)) { \
 104                         if (ast_str_make_space(&sql, ((ast_str_size(sql) + size + 3) / 512 + 1) * 512) != 0) { \
 105                                 ast_log(LOG_ERROR, "Unable to allocate sufficient memory.  Insert CEL '%s:%s' failed.\n", pghostname, table); \
 106                                 ast_free(sql); \
 107                                 ast_free(sql2); \
 108                                 AST_RWLIST_UNLOCK(&psql_columns); \
 109                                 return; \
 110                         } \
 111                 } \
 112         } while (0)
 113
 114 #define LENGTHEN_BUF2(size) \
 115         do { \
 116                 if (ast_str_strlen(sql2) + size + 1 > ast_str_size(sql2)) { \
 117                         if (ast_str_make_space(&sql2, ((ast_str_size(sql2) + size + 3) / 512 + 1) * 512) != 0) { \
 118                                 ast_log(LOG_ERROR, "Unable to allocate sufficient memory.  Insert CEL '%s:%s' failed.\n", pghostname, table); \
 119                                 ast_free(sql); \
 120                                 ast_free(sql2); \
 121                                 AST_RWLIST_UNLOCK(&psql_columns); \
 122                                 return; \
 123                         } \
 124                 } \
 125         } while (0)
 126
 127 static void pgsql_reconnect(void)
 128 {
 129         struct ast_str *conn_info = ast_str_create(128);
 130         if (!conn_info) {
 131                 ast_log(LOG_ERROR, "Failed to allocate memory for connection string.\n");
 132                 return;
 133         }
 134
 135         if (conn) {
 136                 PQfinish(conn);
 137                 conn = NULL;
 138         }
 139
 140         ast_str_set(&conn_info, 0, "host=%s port=%s dbname=%s user=%s",
 141                 pghostname, pgdbport, pgdbname, pgdbuser);
 142
 143         if (!ast_strlen_zero(pgappname)) {
 144                 ast_str_append(&conn_info, 0, " application_name=%s", pgappname);
 145         }
 146
 147         if (!ast_strlen_zero(pgpassword)) {
 148                 ast_str_append(&conn_info, 0, " password=%s", pgpassword);
 149         }
 150
 151         conn = PQconnectdb(ast_str_buffer(conn_info));
 152         ast_free(conn_info);
 153 }
 154
 155
 156 static void pgsql_log(struct ast_event *event)
 157 {
 158         struct ast_tm tm;
 159         char timestr[128];
 160         char *pgerror;
 161         struct ast_cel_event_record record = {
 162                 .version = AST_CEL_EVENT_RECORD_VERSION,
 163         };
 164
 165         if (ast_cel_fill_record(event, &record)) {
 166                 return;
 167         }
 168
 169         ast_mutex_lock(&pgsql_lock);
 170
 171         ast_localtime(&record.event_time, &tm, usegmtime ? "GMT" : NULL);
 172         ast_strftime(timestr, sizeof(timestr), DATE_FORMAT, &tm);
 173
 174         if ((!connected) && pghostname && pgdbuser && pgpassword && pgdbname) {
 175                 pgsql_reconnect();
 176                 if (PQstatus(conn) != CONNECTION_BAD) {
 177                         connected = 1;
 178                 } else {
 179                         pgerror = PQerrorMessage(conn);
 180                         ast_log(LOG_ERROR, "cel_pgsql: Unable to connect to database server %s.  Calls will not be logged!\n", pghostname);
 181                         ast_log(LOG_ERROR, "cel_pgsql: Reason: %s\n", pgerror);
 182                         PQfinish(conn);
 183                         conn = NULL;
 184                 }
 185         }
 186         if (connected) {
 187                 struct columns *cur;
 188                 struct ast_str *sql = ast_str_create(maxsize), *sql2 = ast_str_create(maxsize2);
 189                 char buf[257], escapebuf[513];
 190                 const char *value;
 191                 int first = 1;
 192
 193                 if (!sql || !sql2) {
 194                         goto ast_log_cleanup;
 195                 }
 196
 197                 ast_str_set(&sql, 0, "INSERT INTO %s (", table);
 198                 ast_str_set(&sql2, 0, " VALUES (");
 199
 200 #define SEP (first ? "" : ",")
 201
 202                 AST_RWLIST_RDLOCK(&psql_columns);
 203                 AST_RWLIST_TRAVERSE(&psql_columns, cur, list) {
 204                         LENGTHEN_BUF1(strlen(cur->name) + 2);
 205                         ast_str_append(&sql, 0, "%s\"%s\"", first ? "" : ",", cur->name);
 206
 207                         if (strcmp(cur->name, "eventtime") == 0) {
 208                                 if (strncmp(cur->type, "int", 3) == 0) {
 209                                         LENGTHEN_BUF2(13);
 210                                         ast_str_append(&sql2, 0, "%s%ld", SEP, (long) record.event_time.tv_sec);
 211                                 } else if (strncmp(cur->type, "float", 5) == 0) {
 212                                         LENGTHEN_BUF2(31);
 213                                         ast_str_append(&sql2, 0, "%s%f",
 214                                                 SEP,
 215                                                 (double) record.event_time.tv_sec +
 216                                                 (double) record.event_time.tv_usec / 1000000.0);
 217                                 } else {
 218                                         /* char, hopefully */
 219                                         LENGTHEN_BUF2(31);
 220                                         ast_localtime(&record.event_time, &tm, usegmtime ? "GMT" : NULL);
 221                                         ast_strftime(buf, sizeof(buf), DATE_FORMAT, &tm);
 222                                         ast_str_append(&sql2, 0, "%s'%s'", SEP, buf);
 223                                 }
 224                         } else if (strcmp(cur->name, "eventtype") == 0) {
 225                                 if (cur->type[0] == 'i') {
 226                                         /* Get integer, no need to escape anything */
 227                                         LENGTHEN_BUF2(5);
 228                                         ast_str_append(&sql2, 0, "%s%d", SEP, (int) record.event_type);
 229                                 } else if (strncmp(cur->type, "float", 5) == 0) {
 230                                         LENGTHEN_BUF2(31);
 231                                         ast_str_append(&sql2, 0, "%s%f", SEP, (double) record.event_type);
 232                                 } else {
 233                                         /* Char field, probably */
 234                                         const char *event_name;
 235
 236                                         event_name = (!cel_show_user_def
 237                                                 && record.event_type == AST_CEL_USER_DEFINED)
 238                                                 ? record.user_defined_name : record.event_name;
 239                                         LENGTHEN_BUF2(strlen(event_name) + 1);
 240                                         ast_str_append(&sql2, 0, "%s'%s'", SEP, event_name);
 241                                 }
 242                         } else if (strcmp(cur->name, "amaflags") == 0) {
 243                                 if (strncmp(cur->type, "int", 3) == 0) {
 244                                         /* Integer, no need to escape anything */
 245                                         LENGTHEN_BUF2(13);
 246                                         ast_str_append(&sql2, 0, "%s%u", SEP, record.amaflag);
 247                                 } else {
 248                                         /* Although this is a char field, there are no special characters in the values for these fields */
 249                                         LENGTHEN_BUF2(31);
 250                                         ast_str_append(&sql2, 0, "%s'%u'", SEP, record.amaflag);
 251                                 }
 252                         } else {
 253                                 /* Arbitrary field, could be anything */
 254                                 if (strcmp(cur->name, "userdeftype") == 0) {
 255                                         value = record.user_defined_name;
 256                                 } else if (strcmp(cur->name, "cid_name") == 0) {
 257                                         value = record.caller_id_name;
 258                                 } else if (strcmp(cur->name, "cid_num") == 0) {
 259                                         value = record.caller_id_num;
 260                                 } else if (strcmp(cur->name, "cid_ani") == 0) {
 261                                         value = record.caller_id_ani;
 262                                 } else if (strcmp(cur->name, "cid_rdnis") == 0) {
 263                                         value = record.caller_id_rdnis;
 264                                 } else if (strcmp(cur->name, "cid_dnid") == 0) {
 265                                         value = record.caller_id_dnid;
 266                                 } else if (strcmp(cur->name, "exten") == 0) {
 267                                         value = record.extension;
 268                                 } else if (strcmp(cur->name, "context") == 0) {
 269                                         value = record.context;
 270                                 } else if (strcmp(cur->name, "channame") == 0) {
 271                                         value = record.channel_name;
 272                                 } else if (strcmp(cur->name, "appname") == 0) {
 273                                         value = record.application_name;
 274                                 } else if (strcmp(cur->name, "appdata") == 0) {
 275                                         value = record.application_data;
 276                                 } else if (strcmp(cur->name, "accountcode") == 0) {
 277                                         value = record.account_code;
 278                                 } else if (strcmp(cur->name, "peeraccount") == 0) {
 279                                         value = record.peer_account;
 280                                 } else if (strcmp(cur->name, "uniqueid") == 0) {
 281                                         value = record.unique_id;
 282                                 } else if (strcmp(cur->name, "linkedid") == 0) {
 283                                         value = record.linked_id;
 284                                 } else if (strcmp(cur->name, "userfield") == 0) {
 285                                         value = record.user_field;
 286                                 } else if (strcmp(cur->name, "peer") == 0) {
 287                                         value = record.peer;
 288                                 } else if (strcmp(cur->name, "extra") == 0) {
 289                                         value = record.extra;
 290                                 } else {
 291                                         value = NULL;
 292                                 }
 293
 294                                 if (value == NULL) {
 295                                         ast_str_append(&sql2, 0, "%sDEFAULT", SEP);
 296                                 } else if (strncmp(cur->type, "int", 3) == 0) {
 297                                         long long whatever;
 298                                         if (value && sscanf(value, "%30lld", &whatever) == 1) {
 299                                                 LENGTHEN_BUF2(26);
 300                                                 ast_str_append(&sql2, 0, "%s%lld", SEP, whatever);
 301                                         } else {
 302                                                 LENGTHEN_BUF2(2);
 303                                                 ast_str_append(&sql2, 0, "%s0", SEP);
 304                                         }
 305                                 } else if (strncmp(cur->type, "float", 5) == 0) {
 306                                         long double whatever;
 307                                         if (value && sscanf(value, "%30Lf", &whatever) == 1) {
 308                                                 LENGTHEN_BUF2(51);
 309                                                 ast_str_append(&sql2, 0, "%s%30Lf", SEP, whatever);
 310                                         } else {
 311                                                 LENGTHEN_BUF2(2);
 312                                                 ast_str_append(&sql2, 0, "%s0", SEP);
 313                                         }
 314                                         /* XXX Might want to handle dates, times, and other misc fields here XXX */
 315                                 } else {
 316                                         if (value) {
 317                                                 PQescapeStringConn(conn, escapebuf, value, strlen(value), NULL);
 318                                         } else {
 319                                                 escapebuf[0] = '\0';
 320                                         }
 321                                         LENGTHEN_BUF2(strlen(escapebuf) + 3);
 322                                         ast_str_append(&sql2, 0, "%s'%s'", SEP, escapebuf);
 323                                 }
 324                         }
 325                         first = 0;
 326                 }
 327                 AST_RWLIST_UNLOCK(&psql_columns);
 328                 LENGTHEN_BUF1(ast_str_strlen(sql2) + 2);
 329                 ast_str_append(&sql, 0, ")%s)", ast_str_buffer(sql2));
 330
 331                 ast_debug(3, "Inserting a CEL record: [%s].\n", ast_str_buffer(sql));
 332                 /* Test to be sure we're still connected... */
 333                 /* If we're connected, and connection is working, good. */
 334                 /* Otherwise, attempt reconnect.  If it fails... sorry... */
 335                 if (PQstatus(conn) == CONNECTION_OK) {
 336                         connected = 1;
 337                 } else {
 338                         ast_log(LOG_WARNING, "Connection was lost... attempting to reconnect.\n");
 339                         PQreset(conn);
 340                         if (PQstatus(conn) == CONNECTION_OK) {
 341                                 ast_log(LOG_NOTICE, "Connection reestablished.\n");
 342                                 connected = 1;
 343                         } else {
 344                                 pgerror = PQerrorMessage(conn);
 345                                 ast_log(LOG_ERROR, "Unable to reconnect to database server %s. Calls will not be logged!\n", pghostname);
 346                                 ast_log(LOG_ERROR, "Reason: %s\n", pgerror);
 347                                 PQfinish(conn);
 348                                 conn = NULL;
 349                                 connected = 0;
 350                                 goto ast_log_cleanup;
 351                         }
 352                 }
 353                 result = PQexec(conn, ast_str_buffer(sql));
 354                 if (PQresultStatus(result) != PGRES_COMMAND_OK) {
 355                         pgerror = PQresultErrorMessage(result);
 356                         ast_log(LOG_WARNING, "Failed to insert call detail record into database!\n");
 357                         ast_log(LOG_WARNING, "Reason: %s\n", pgerror);
 358                         ast_log(LOG_WARNING, "Connection may have been lost... attempting to reconnect.\n");
 359                         PQreset(conn);
 360                         if (PQstatus(conn) == CONNECTION_OK) {
 361                                 ast_log(LOG_NOTICE, "Connection reestablished.\n");
 362                                 connected = 1;
 363                                 PQclear(result);
 364                                 result = PQexec(conn, ast_str_buffer(sql));
 365                                 if (PQresultStatus(result) != PGRES_COMMAND_OK) {
 366                                         pgerror = PQresultErrorMessage(result);
 367                                         ast_log(LOG_ERROR, "HARD ERROR!  Attempted reconnection failed.  DROPPING CALL RECORD!\n");
 368                                         ast_log(LOG_ERROR, "Reason: %s\n", pgerror);
 369                                 }
 370                         }
 371                         PQclear(result);
 372                         goto ast_log_cleanup;
 373                 }
 374                 PQclear(result);
 375
 376                 /* Next time, just allocate buffers that are that big to start with. */
 377                 if (ast_str_strlen(sql) > maxsize) {
 378                         maxsize = ast_str_strlen(sql);
 379                 }
 380                 if (ast_str_strlen(sql2) > maxsize2) {
 381                         maxsize2 = ast_str_strlen(sql2);
 382                 }
 383
 384 ast_log_cleanup:
 385                 ast_free(sql);
 386                 ast_free(sql2);
 387         }
 388
 389         ast_mutex_unlock(&pgsql_lock);
 390 }
 391
 392 static int my_unload_module(void)
 393 {
 394         struct columns *current;
 395
 396         ast_cel_backend_unregister(PGSQL_BACKEND_NAME);
 397         AST_RWLIST_WRLOCK(&psql_columns);
 398         if (conn) {
 399                 PQfinish(conn);
 400                 conn = NULL;
 401         }
 402         if (pghostname) {
 403                 ast_free(pghostname);
 404                 pghostname = NULL;
 405         }
 406         if (pgdbname) {
 407                 ast_free(pgdbname);
 408                 pgdbname = NULL;
 409         }
 410         if (pgdbuser) {
 411                 ast_free(pgdbuser);
 412                 pgdbuser = NULL;
 413         }
 414         if (pgpassword) {
 415                 ast_free(pgpassword);
 416                 pgpassword = NULL;
 417         }
 418         if (pgappname) {
 419                 ast_free(pgappname);
 420                 pgappname = NULL;
 421         }
 422         if (pgdbport) {
 423                 ast_free(pgdbport);
 424                 pgdbport = NULL;
 425         }
 426         if (table) {
 427                 ast_free(table);
 428                 table = NULL;
 429         }
 430         while ((current = AST_RWLIST_REMOVE_HEAD(&psql_columns, list))) {
 431                 ast_free(current);
 432         }
 433         AST_RWLIST_UNLOCK(&psql_columns);
 434         return 0;
 435 }
 436
 437 static int unload_module(void)
 438 {
 439         return my_unload_module();
 440 }
 441
 442 static int process_my_load_module(struct ast_config *cfg)
 443 {
 444         struct ast_variable *var;
 445         char *pgerror;
 446         const char *tmp;
 447         PGresult *result;
 448         struct columns *cur;
 449
 450         if (!(var = ast_variable_browse(cfg, "global"))) {
 451                 ast_log(LOG_WARNING,"CEL pgsql config file missing global section.\n");
 452                 return AST_MODULE_LOAD_DECLINE;
 453         }
 454         if (!(tmp = ast_variable_retrieve(cfg,"global","hostname"))) {
 455                 ast_log(LOG_WARNING,"PostgreSQL server hostname not specified.  Assuming unix socket connection\n");
 456                 tmp = "";       /* connect via UNIX-socket by default */
 457         }
 458         if (pghostname)
 459                 ast_free(pghostname);
 460         if (!(pghostname = ast_strdup(tmp))) {
 461                 ast_log(LOG_WARNING,"PostgreSQL Ran out of memory copying host info\n");
 462                 return AST_MODULE_LOAD_DECLINE;
 463         }
 464         if (!(tmp = ast_variable_retrieve(cfg, "global", "dbname"))) {
 465                 ast_log(LOG_WARNING,"PostgreSQL database not specified.  Assuming asterisk\n");
 466                 tmp = "asteriskceldb";
 467         }
 468         if (pgdbname)
 469                 ast_free(pgdbname);
 470         if (!(pgdbname = ast_strdup(tmp))) {
 471                 ast_log(LOG_WARNING,"PostgreSQL Ran out of memory copying dbname info\n");
 472                 return AST_MODULE_LOAD_DECLINE;
 473         }
 474         if (!(tmp = ast_variable_retrieve(cfg, "global", "user"))) {
 475                 ast_log(LOG_WARNING,"PostgreSQL database user not specified.  Assuming asterisk\n");
 476                 tmp = "asterisk";
 477         }
 478         if (pgdbuser)
 479                 ast_free(pgdbuser);
 480         if (!(pgdbuser = ast_strdup(tmp))) {
 481                 ast_log(LOG_WARNING,"PostgreSQL Ran out of memory copying user info\n");
 482                 return AST_MODULE_LOAD_DECLINE;
 483         }
 484         if (!(tmp = ast_variable_retrieve(cfg, "global", "password"))) {
 485                 ast_log(LOG_WARNING, "PostgreSQL database password not specified.  Assuming blank\n");
 486                 tmp = "";
 487         }
 488         if (pgpassword)
 489                 ast_free(pgpassword);
 490         if (!(pgpassword = ast_strdup(tmp))) {
 491                 ast_log(LOG_WARNING,"PostgreSQL Ran out of memory copying password info\n");
 492                 return AST_MODULE_LOAD_DECLINE;
 493         }
 494         if (!(tmp = ast_variable_retrieve(cfg, "global", "appname"))) {
 495                 tmp = "";
 496         }
 497         if (pgappname) {
 498                 ast_free(pgappname);
 499         }
 500         if (!(pgappname = ast_strdup(tmp))) {
 501                 ast_log(LOG_WARNING,"PostgreSQL Ran out of memory copying appname info\n");
 502                 return AST_MODULE_LOAD_DECLINE;
 503         }
 504
 505         if (!(tmp = ast_variable_retrieve(cfg,"global","port"))) {
 506                 ast_log(LOG_WARNING,"PostgreSQL database port not specified.  Using default 5432.\n");
 507                 tmp = "5432";
 508         }
 509         if (pgdbport)
 510                 ast_free(pgdbport);
 511         if (!(pgdbport = ast_strdup(tmp))) {
 512                 ast_log(LOG_WARNING,"PostgreSQL Ran out of memory copying port info\n");
 513                 return AST_MODULE_LOAD_DECLINE;
 514         }
 515         if (!(tmp = ast_variable_retrieve(cfg, "global", "table"))) {
 516                 ast_log(LOG_WARNING,"CEL table not specified.  Assuming cel\n");
 517                 tmp = "cel";
 518         }
 519         if (table)
 520                 ast_free(table);
 521         if (!(table = ast_strdup(tmp))) {
 522                 return AST_MODULE_LOAD_DECLINE;
 523         }
 524         cel_show_user_def = CEL_SHOW_USERDEF_DEFAULT;
 525         if ((tmp = ast_variable_retrieve(cfg, "global", "show_user_defined"))) {
 526                 cel_show_user_def = ast_true(tmp) ? 1 : 0;
 527         }
 528         if ((tmp = ast_variable_retrieve(cfg, "global", "usegmtime"))) {
 529                 usegmtime = ast_true(tmp);
 530         } else {
 531                 usegmtime = 0;
 532         }
 533         if (option_debug) {
 534                 if (ast_strlen_zero(pghostname)) {
 535                         ast_debug(3, "cel_pgsql: using default unix socket\n");
 536                 } else {
 537                         ast_debug(3, "cel_pgsql: got hostname of %s\n", pghostname);
 538                 }
 539                 ast_debug(3, "cel_pgsql: got port of %s\n", pgdbport);
 540                 ast_debug(3, "cel_pgsql: got user of %s\n", pgdbuser);
 541                 ast_debug(3, "cel_pgsql: got dbname of %s\n", pgdbname);
 542                 ast_debug(3, "cel_pgsql: got password of %s\n", pgpassword);
 543                 ast_debug(3, "cel_pgsql: got sql table name of %s\n", table);
 544                 ast_debug(3, "cel_pgsql: got show_user_defined of %s\n",
 545                         cel_show_user_def ? "Yes" : "No");
 546         }
 547
 548         pgsql_reconnect();
 549         if (PQstatus(conn) != CONNECTION_BAD) {
 550                 char sqlcmd[512];
 551                 char *fname, *ftype, *flen, *fnotnull, *fdef;
 552                 char *tableptr;
 553                 int i, rows;
 554
 555                 ast_debug(1, "Successfully connected to PostgreSQL database.\n");
 556                 connected = 1;
 557
 558                 /* Remove any schema name from the table */
 559                 if ((tableptr = strrchr(table, '.'))) {
 560                         tableptr++;
 561                 } else {
 562                         tableptr = table;
 563                 }
 564
 565                 /* Query the columns */
 566                 snprintf(sqlcmd, sizeof(sqlcmd), "select a.attname, t.typname, a.attlen, a.attnotnull, d.adsrc from pg_class c, pg_type t, pg_attribute a left outer join pg_attrdef d on a.atthasdef and d.adrelid = a.attrelid and d.adnum = a.attnum where c.oid = a.attrelid and a.atttypid = t.oid and (a.attnum > 0) and c.relname = '%s' order by c.relname, attnum", tableptr);
 567                 result = PQexec(conn, sqlcmd);
 568                 if (PQresultStatus(result) != PGRES_TUPLES_OK) {
 569                         pgerror = PQresultErrorMessage(result);
 570                         ast_log(LOG_ERROR, "Failed to query database columns: %s\n", pgerror);
 571                         PQclear(result);
 572                         unload_module();
 573                         return AST_MODULE_LOAD_DECLINE;
 574                 }
 575
 576                 rows = PQntuples(result);
 577                 for (i = 0; i < rows; i++) {
 578                         fname = PQgetvalue(result, i, 0);
 579                         ftype = PQgetvalue(result, i, 1);
 580                         flen = PQgetvalue(result, i, 2);
 581                         fnotnull = PQgetvalue(result, i, 3);
 582                         fdef = PQgetvalue(result, i, 4);
 583                         ast_verb(4, "Found column '%s' of type '%s'\n", fname, ftype);
 584                         cur = ast_calloc(1, sizeof(*cur) + strlen(fname) + strlen(ftype) + 2);
 585                         if (cur) {
 586                                 sscanf(flen, "%30d", &cur->len);
 587                                 cur->name = (char *)cur + sizeof(*cur);
 588                                 cur->type = (char *)cur + sizeof(*cur) + strlen(fname) + 1;
 589                                 strcpy(cur->name, fname);
 590                                 strcpy(cur->type, ftype);
 591                                 if (*fnotnull == 't') {
 592                                         cur->notnull = 1;
 593                                 } else {
 594                                         cur->notnull = 0;
 595                                 }
 596                                 if (!ast_strlen_zero(fdef)) {
 597                                         cur->hasdefault = 1;
 598                                 } else {
 599                                         cur->hasdefault = 0;
 600                                 }
 601                                 AST_RWLIST_INSERT_TAIL(&psql_columns, cur, list);
 602                         }
 603                 }
 604                 PQclear(result);
 605         } else {
 606                 pgerror = PQerrorMessage(conn);
 607                 ast_log(LOG_ERROR, "cel_pgsql: Unable to connect to database server %s.  CALLS WILL NOT BE LOGGED!!\n", pghostname);
 608                 ast_log(LOG_ERROR, "cel_pgsql: Reason: %s\n", pgerror);
 609                 connected = 0;
 610                 PQfinish(conn);
 611                 conn = NULL;
 612         }
 613         return AST_MODULE_LOAD_SUCCESS;
 614 }
 615
 616 static int my_load_module(int reload)
 617 {
 618         struct ast_config *cfg;
 619         struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };
 620
 621         if ((cfg = ast_config_load(config, config_flags)) == NULL || cfg == CONFIG_STATUS_FILEINVALID) {
 622                 ast_log(LOG_WARNING, "Unable to load config for PostgreSQL CEL's: %s\n", config);
 623                 return AST_MODULE_LOAD_DECLINE;
 624         } else if (cfg == CONFIG_STATUS_FILEUNCHANGED) {
 625                 return AST_MODULE_LOAD_SUCCESS;
 626         }
 627
 628         if (reload) {
 629                 my_unload_module();
 630         }
 631
 632         process_my_load_module(cfg);
 633         ast_config_destroy(cfg);
 634
 635         if (ast_cel_backend_register(PGSQL_BACKEND_NAME, pgsql_log)) {
 636                 ast_log(LOG_WARNING, "Unable to subscribe to CEL events for pgsql\n");
 637                 return AST_MODULE_LOAD_DECLINE;
 638         }
 639
 640         return AST_MODULE_LOAD_SUCCESS;
 641 }
 642
 643 static int load_module(void)
 644 {
 645         return my_load_module(0);
 646 }
 647
 648 static int reload(void)
 649 {
 650         return my_load_module(1);
 651 }
 652
 653 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PostgreSQL CEL Backend",
 654         .support_level = AST_MODULE_SUPPORT_EXTENDED,
 655         .load = load_module,
 656         .unload = unload_module,
 657         .reload = reload,
 658         .load_pri = AST_MODPRI_CDR_DRIVER,
 659 );