res_config_mysql.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999-2005, Digium, Inc.
 *
 * Mark Spencer <[email protected]> - Asterisk Author
 * Matthew Boehm <[email protected]> - MySQL RealTime Driver Author
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*!
 * \file
 * \brief MySQL CDR backend
 */

/*** MODULEINFO
 <depend>mysqlclient</depend>
 <defaultenabled>no</defaultenabled>
 <support_level>extended</support_level>
 ***/

#include "asterisk.h"

#include <sys/stat.h>

#include <mysql/mysql.h>
#include <mysql/errmsg.h>

#include "asterisk/channel.h"
#include "asterisk/logger.h"
#include "asterisk/config.h"
#include "asterisk/module.h"
#include "asterisk/lock.h"
#include "asterisk/options.h"
#include "asterisk/cli.h"
#include "asterisk/utils.h"
#include "asterisk/threadstorage.h"
#include "asterisk/strings.h"

#define RES_CONFIG_MYSQL_CONF "res_config_mysql.conf"
#define RES_CONFIG_MYSQL_CONF_OLD "res_mysql.conf"
#define READHANDLE 0
#define WRITEHANDLE 1

#define ESCAPE_STRING(buf, var) \
 do { \
 struct ast_str *semi = ast_str_thread_get(&scratch2_buf, strlen(var) * 3 + 1); \
 const char *chunk = var; \
 ast_str_reset(semi); \
 for (; *chunk; chunk++) { \
 if (strchr(";^", *chunk)) { \
 ast_str_append(&semi, 0, "^%02hhX", *chunk); \
 } else { \
 ast_str_append(&semi, 0, "%c", *chunk); \
 } \
 } \
 if (ast_str_strlen(semi) * 2 + 1 > ast_str_size(buf)) { \
 ast_str_make_space(&(buf), ast_str_strlen(semi) * 2 + 1); \
 } \
 mysql_real_escape_string(&dbh->handle, ast_str_buffer(buf), ast_str_buffer(semi), ast_str_strlen(semi)); \
 } while (0)

AST_THREADSTORAGE(sql_buf);
AST_THREADSTORAGE(sql2_buf);
AST_THREADSTORAGE(find_buf);
AST_THREADSTORAGE(scratch_buf);
AST_THREADSTORAGE(scratch2_buf);
AST_THREADSTORAGE(modify_buf);
AST_THREADSTORAGE(modify2_buf);
AST_THREADSTORAGE(modify3_buf);

enum requirements { RQ_WARN, RQ_CREATECLOSE, RQ_CREATECHAR };

struct mysql_conn {
 AST_RWLIST_ENTRY(mysql_conn) list;
 ast_mutex_t lock;
 MYSQL handle;
 char host[50];
 char name[50];
 char user[50];
 char pass[50];
 char sock[50];
 char charset[50];
 int port;
 int connected;
 time_t connect_time;
 enum requirements requirements;
 char unique_name[0];
};

struct columns {
 char *name;
 char *type;
 char *dflt;
 char null;
 int len;
 AST_LIST_ENTRY(columns) list;
};

struct tables {
 ast_mutex_t lock;
 AST_LIST_HEAD_NOLOCK(mysql_columns, columns) columns;
 AST_LIST_ENTRY(tables) list;
 struct mysql_conn *database;
 char name[0];
};

static AST_LIST_HEAD_STATIC(mysql_tables, tables);
static AST_RWLIST_HEAD_STATIC(databases, mysql_conn);

static int parse_config(int reload);
static int mysql_reconnect(struct mysql_conn *conn);
static char *handle_cli_realtime_mysql_status(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
static char *handle_cli_realtime_mysql_cache(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
static int load_mysql_config(struct ast_config *config, const char *category, struct mysql_conn *conn);
static int require_mysql(const char *database, const char *tablename, va_list ap);

static struct ast_cli_entry cli_realtime_mysql_status[] = {
 AST_CLI_DEFINE(handle_cli_realtime_mysql_status, "Shows connection information for the MySQL RealTime driver"),
 AST_CLI_DEFINE(handle_cli_realtime_mysql_cache, "Shows cached tables within the MySQL realtime driver"),
};

static struct mysql_conn *find_database(const char *database, int for_write)
{
 char *whichdb;
 const char *ptr;
 struct mysql_conn *cur;

 if ((ptr = strchr(database, '/'))) {
 /* Multiple databases encoded within string */
 if (for_write) {
 whichdb = ast_strdupa(ptr + 1);
 } else {
 whichdb = ast_alloca(ptr - database + 1);
 strncpy(whichdb, database, ptr - database);
 whichdb[ptr - database] = '\0';
 }
 } else {
 whichdb = ast_strdupa(database);
 }

 AST_RWLIST_RDLOCK(&databases);
 AST_RWLIST_TRAVERSE(&databases, cur, list) {
 if (!strcmp(cur->unique_name, whichdb)) {
 ast_mutex_lock(&cur->lock);
 break;
 }
 }
 AST_RWLIST_UNLOCK(&databases);
 return cur;
}

#define release_database(a) ast_mutex_unlock(&(a)->lock)

static void destroy_table(struct tables *table)
{
 struct columns *column;
 ast_mutex_lock(&table->lock);
 while ((column = AST_LIST_REMOVE_HEAD(&table->columns, list))) {
 ast_free(column);
 }
 ast_mutex_unlock(&table->lock);
 ast_mutex_destroy(&table->lock);
 ast_free(table);
}

static struct tables *find_table(const char *database, const char *tablename)
{
 struct columns *column;
 struct tables *table;
 struct ast_str *sql = ast_str_thread_get(&find_buf, 30);
 char *fname, *ftype, *flen, *fdflt, *fnull;
 struct mysql_conn *dbh;
 MYSQL_RES *result;
 MYSQL_ROW row;

 if (!(dbh = find_database(database, 1))) {
 return NULL;
 }

 AST_LIST_LOCK(&mysql_tables);
 AST_LIST_TRAVERSE(&mysql_tables, table, list) {
 if (!strcasecmp(table->name, tablename)) {
 ast_mutex_lock(&table->lock);
 AST_LIST_UNLOCK(&mysql_tables);
 release_database(dbh);
 return table;
 }
 }

 /* Not found, scan the table */
 ast_str_set(&sql, 0, "DESC %s", tablename);

 if (!mysql_reconnect(dbh)) {
 release_database(dbh);
 AST_LIST_UNLOCK(&mysql_tables);
 return NULL;
 }

 if (mysql_real_query(&dbh->handle, ast_str_buffer(sql), ast_str_strlen(sql))) {
 ast_log(LOG_ERROR, "Failed to query database '%s', table '%s' columns: %s\n", database, tablename, mysql_error(&dbh->handle));
 release_database(dbh);
 AST_LIST_UNLOCK(&mysql_tables);
 return NULL;
 }

 if (!(table = ast_calloc(1, sizeof(*table) + strlen(tablename) + 1))) {
 ast_log(LOG_ERROR, "Unable to allocate memory for new table structure\n");
 release_database(dbh);
 AST_LIST_UNLOCK(&mysql_tables);
 return NULL;
 }
 strcpy(table->name, tablename); /* SAFE */
 table->database = dbh;
 ast_mutex_init(&table->lock);
 AST_LIST_HEAD_INIT_NOLOCK(&table->columns);

 if ((result = mysql_store_result(&dbh->handle))) {
 while ((row = mysql_fetch_row(result))) {
 fname = row[0];
 ftype = row[1];
 fnull = row[2];
 fdflt = row[4];
 ast_verb(4, "Found column '%s' of type '%s'\n", fname, ftype);

 if (fdflt == NULL) {
 fdflt = "";
 }

 if (!(column = ast_calloc(1, sizeof(*column) + strlen(fname) + strlen(ftype) + strlen(fdflt) + 3))) {
 ast_log(LOG_ERROR, "Unable to allocate column element %s for %s\n", fname, tablename);
 destroy_table(table);
 release_database(dbh);
 AST_LIST_UNLOCK(&mysql_tables);
 return NULL;
 }

 if ((flen = strchr(ftype, '('))) {
 sscanf(flen, "(%30d)", &column->len);
 } else {
 /* Columns like dates, times, and timestamps don't have a length */
 column->len = -1;
 }

 column->name = (char *)column + sizeof(*column);
 column->type = (char *)column + sizeof(*column) + strlen(fname) + 1;
 column->dflt = (char *)column + sizeof(*column) + strlen(fname) + 1 + strlen(ftype) + 1;
 strcpy(column->name, fname);
 strcpy(column->type, ftype);
 strcpy(column->dflt, fdflt);
 column->null = (strcmp(fnull, "YES") == 0 ? 1 : 0);
 AST_LIST_INSERT_TAIL(&table->columns, column, list);
 }
 mysql_free_result(result);
 }

 AST_LIST_INSERT_TAIL(&mysql_tables, table, list);
 ast_mutex_lock(&table->lock);
 AST_LIST_UNLOCK(&mysql_tables);
 release_database(dbh);
 return table;
}

static void release_table(struct tables *table)
{
 if (table) {
 ast_mutex_unlock(&table->lock);
 }
}

static struct columns *find_column(struct tables *table, const char *colname)
{
 struct columns *column;

 AST_LIST_TRAVERSE(&table->columns, column, list) {
 if (strcmp(column->name, colname) == 0) {
 break;
 }
 }

 return column;
}

static char *decode_chunk(char *chunk)
{
 char *orig = chunk;
 for (; *chunk; chunk++) {
 if (*chunk == '^' && strchr("0123456789ABCDEFabcdef", chunk[1]) && strchr("0123456789ABCDEFabcdef", chunk[2])) {
 sscanf(chunk + 1, "%02hhX", chunk);
 memmove(chunk + 1, chunk + 3, strlen(chunk + 3) + 1);
 }
 }
 return orig;
}

#define IS_SQL_LIKE_CLAUSE(x) ((x) && ast_ends_with(x, " LIKE"))

/* MySQL requires us to escape the escape... yo dawg */
static char *ESCAPE_CLAUSE = " ESCAPE '\\\\'";

static struct ast_variable *realtime_mysql(const char *database, const char *table, const struct ast_variable *rt_fields)
{
 struct mysql_conn *dbh;
 MYSQL_RES *result;
 MYSQL_ROW row;
 MYSQL_FIELD *fields;
 int numFields, i;
 struct ast_str *sql = ast_str_thread_get(&sql_buf, 16);
 struct ast_str *buf = ast_str_thread_get(&scratch_buf, 16);
 char *stringp;
 char *chunk;
 char *op;
 char *escape = "";
 const struct ast_variable *field = rt_fields;
 struct ast_variable *var=NULL, *prev=NULL;

 if (!(dbh = find_database(database, 0))) {
 ast_log(LOG_WARNING, "MySQL RealTime: Invalid database specified: %s (check res_mysql.conf)\n", database);
 return NULL;
 }

 if (!table) {
 ast_log(LOG_WARNING, "MySQL RealTime: No table specified.\n");
 release_database(dbh);
 return NULL;
 }

 /* Get the first parameter and first value in our list of passed paramater/value pairs */
 if (!field) {
 ast_log(LOG_WARNING, "MySQL RealTime: Realtime retrieval requires at least 1 parameter and 1 value to search on.\n");
 release_database(dbh);
 return NULL;
 }

 /* Must connect to the server before anything else, as the escape function requires the mysql handle. */
 if (!mysql_reconnect(dbh)) {
 release_database(dbh);
 return NULL;
 }

 /* Create the first part of the query using the first parameter/value pairs we just extracted
 If there is only 1 set, then we have our query. Otherwise, loop thru the list and concat */

 if (!strchr(field->name, ' ')) {
 op = " =";
 } else {
 op = "";
 if (IS_SQL_LIKE_CLAUSE(field->name)) {
 escape = ESCAPE_CLAUSE;
 }
 }

 ESCAPE_STRING(buf, field->value);
 ast_str_set(&sql, 0, "SELECT * FROM %s WHERE %s%s '%s'%s", table, field->name, op, ast_str_buffer(buf), escape);
 while ((field = field->next)) {
 escape = "";
 if (!strchr(field->name, ' ')) {
 op = " =";
 } else {
 op = "";
 if (IS_SQL_LIKE_CLAUSE(field->name)) {
 escape = ESCAPE_CLAUSE;
 }
 }
 ESCAPE_STRING(buf, field->value);
 ast_str_append(&sql, 0, " AND %s%s '%s'%s", field->name, op, ast_str_buffer(buf), escape);
 }

 ast_debug(1, "MySQL RealTime: Retrieve SQL: %s\n", ast_str_buffer(sql));

 /* Execution. */
 if (mysql_real_query(&dbh->handle, ast_str_buffer(sql), ast_str_strlen(sql))) {
 ast_log(LOG_WARNING, "MySQL RealTime: Failed to query database: %s\n", mysql_error(&dbh->handle));
 release_database(dbh);
 return NULL;
 }

 if ((result = mysql_store_result(&dbh->handle))) {
 numFields = mysql_num_fields(result);
 fields = mysql_fetch_fields(result);

 while ((row = mysql_fetch_row(result))) {
 for (i = 0; i < numFields; i++) {
 /* Encode NULL values separately from blank values, for the Realtime API */
 if (row[i] == NULL) {
 row[i] = "";
 } else if (ast_strlen_zero(row[i])) {
 row[i] = " ";
 }
 for (stringp = row[i], chunk = strsep(&stringp, ";"); chunk; chunk = strsep(&stringp, ";")) {
 if (prev) {
 if ((prev->next = ast_variable_new(fields[i].name, decode_chunk(chunk), ""))) {
 prev = prev->next;
 }
 } else {
 prev = var = ast_variable_new(fields[i].name, decode_chunk(chunk), "");
 }
 }
 }
 }
 } else {
 ast_debug(1, "MySQL RealTime: Could not find any rows in table %s.\n", table);
 }

 release_database(dbh);
 mysql_free_result(result);

 return var;
}

static struct ast_config *realtime_multi_mysql(const char *database, const char *table, const struct ast_variable *rt_fields)
{
 struct mysql_conn *dbh;
 MYSQL_RES *result;
 MYSQL_ROW row;
 MYSQL_FIELD *fields;
 int numFields, i;
 struct ast_str *sql = ast_str_thread_get(&sql_buf, 16);
 struct ast_str *buf = ast_str_thread_get(&scratch_buf, 16);
 const char *initfield = NULL;
 char *stringp;
 char *chunk;
 char *op;
 char *escape = "";
 const struct ast_variable *field = rt_fields;
 struct ast_variable *var = NULL;
 struct ast_config *cfg = NULL;
 struct ast_category *cat = NULL;

 if (!(dbh = find_database(database, 0))) {
 ast_log(LOG_WARNING, "MySQL RealTime: Invalid database specified: '%s' (check res_mysql.conf)\n", database);
 return NULL;
 }

 if (!table) {
 ast_log(LOG_WARNING, "MySQL RealTime: No table specified.\n");
 release_database(dbh);
 return NULL;
 }

 if (!(cfg = ast_config_new())) {
 /* If I can't alloc memory at this point, why bother doing anything else? */
 ast_log(LOG_WARNING, "Out of memory!\n");
 release_database(dbh);
 return NULL;
 }

 /* Get the first parameter and first value in our list of passed paramater/value pairs */
 if (!field) {
 ast_log(LOG_WARNING, "MySQL RealTime: Realtime retrieval requires at least 1 parameter and 1 value to search on.\n");
 ast_config_destroy(cfg);
 release_database(dbh);
 return NULL;
 }

 initfield = ast_strdupa(field->name);
 if ((op = strchr(initfield, ' '))) {
 *op = '\0';
 }

 /* Must connect to the server before anything else, as the escape function requires the mysql handle. */
 if (!mysql_reconnect(dbh)) {
 release_database(dbh);
 ast_config_destroy(cfg);
 return NULL;
 }

 /* Create the first part of the query using the first parameter/value pairs we just extracted
 If there is only 1 set, then we have our query. Otherwise, loop thru the list and concat */

 if (!strchr(field->name, ' ')) {
 op = " =";
 } else {
 op = "";
 if (IS_SQL_LIKE_CLAUSE(field->name)) {
 escape = ESCAPE_CLAUSE;
 }
 }

 ESCAPE_STRING(buf, field->value);
 ast_str_set(&sql, 0, "SELECT * FROM %s WHERE %s%s '%s'%s", table, field->name, op, ast_str_buffer(buf), escape);
 while ((field = field->next)) {
 escape = "";
 if (!strchr(field->name, ' ')) {
 op = " =";
 } else {
 op = "";
 if (IS_SQL_LIKE_CLAUSE(field->name)) {
 escape = ESCAPE_CLAUSE;
 }
 }
 ESCAPE_STRING(buf, field->value);
 ast_str_append(&sql, 0, " AND %s%s '%s'%s", field->name, op, ast_str_buffer(buf), escape);
 }

 if (initfield) {
 ast_str_append(&sql, 0, " ORDER BY %s", initfield);
 }

 ast_debug(1, "MySQL RealTime: Retrieve SQL: %s\n", ast_str_buffer(sql));

 /* Execution. */
 if (mysql_real_query(&dbh->handle, ast_str_buffer(sql), ast_str_strlen(sql))) {
 ast_log(LOG_WARNING, "MySQL RealTime: Failed to query database: %s\n", mysql_error(&dbh->handle));
 release_database(dbh);
 ast_config_destroy(cfg);
 return NULL;
 }

 if ((result = mysql_store_result(&dbh->handle))) {
 numFields = mysql_num_fields(result);
 fields = mysql_fetch_fields(result);

 while ((row = mysql_fetch_row(result))) {
 var = NULL;
 cat = ast_category_new_anonymous();
 if (!cat) {
 continue;
 }
 for (i = 0; i < numFields; i++) {
 if (ast_strlen_zero(row[i]))
 continue;
 for (stringp = row[i], chunk = strsep(&stringp, ";"); chunk; chunk = strsep(&stringp, ";")) {
 if (chunk && !ast_strlen_zero(decode_chunk(ast_strip(chunk)))) {
 if (initfield && !strcmp(initfield, fields[i].name)) {
 ast_category_rename(cat, chunk);
 }
 var = ast_variable_new(fields[i].name, chunk, "");
 ast_variable_append(cat, var);
 }
 }
 }
 ast_category_append(cfg, cat);
 }
 } else {
 ast_debug(1, "MySQL RealTime: Could not find any rows in table %s.\n", table);
 }

 release_database(dbh);
 mysql_free_result(result);

 return cfg;
}

static int update_mysql(const char *database, const char *tablename, const char *keyfield, const char *lookup, const struct ast_variable *rt_fields)
{
 struct mysql_conn *dbh;
 uint64_t numrows;
 const struct ast_variable *field = rt_fields;
 struct ast_str *sql = ast_str_thread_get(&sql_buf, 100), *buf = ast_str_thread_get(&scratch_buf, 100);
 struct tables *table;
 struct columns *column = NULL;

 if (!(dbh = find_database(database, 1))) {
 ast_log(LOG_WARNING, "MySQL RealTime: Invalid database specified: '%s' (check res_mysql.conf)\n", database);
 return -1;
 }

 if (!tablename) {
 ast_log(LOG_WARNING, "MySQL RealTime: No table specified.\n");
 release_database(dbh);
 return -1;
 }

 if (!(table = find_table(database, tablename))) {
 ast_log(LOG_ERROR, "Table '%s' does not exist!!\n", tablename);
 release_database(dbh);
 return -1;
 }

 if (!(column = find_column(table, keyfield))) {
 ast_log(LOG_ERROR, "MySQL RealTime: Updating on column '%s', but that column does not exist within the table '%s' (db '%s')!\n", keyfield, tablename, database);
 release_table(table);
 release_database(dbh);
 return -1;
 }

 /* Get the first parameter and first value in our list of passed paramater/value pairs */
 if (!field) {
 ast_log(LOG_WARNING, "MySQL RealTime: Realtime update requires at least 1 parameter and 1 value to update.\n");
 release_table(table);
 release_database(dbh);
 return -1;
 }

 /* Check that the column exists in the table */
 if (!(column = find_column(table, field->name))) {
 ast_log(LOG_ERROR, "MySQL RealTime: Updating column '%s', but that column does not exist within the table '%s' (first pair MUST exist)!\n", field->name, tablename);
 release_table(table);
 release_database(dbh);
 return -1;
 }

 /* Must connect to the server before anything else, as the escape function requires the mysql handle. */
 if (!mysql_reconnect(dbh)) {
 release_table(table);
 release_database(dbh);
 return -1;
 }

 /* Create the first part of the query using the first parameter/value pairs we just extracted
 If there is only 1 set, then we have our query. Otherwise, loop thru the list and concat */

 ESCAPE_STRING(buf, field->value);
 ast_str_set(&sql, 0, "UPDATE %s SET `%s` = '%s'", tablename, field->name, ast_str_buffer(buf));

 while ((field = field->next)) {
 /* If the column is not within the table, then skip it */
 if (!(column = find_column(table, field->name))) {
 ast_log(LOG_WARNING, "Attempted to update column '%s' in table '%s', but column does not exist!\n", field->name, tablename);
 continue;
 }

 ESCAPE_STRING(buf, field->value);
 ast_str_append(&sql, 0, ", `%s` = '%s'", field->name, ast_str_buffer(buf));
 }

 ESCAPE_STRING(buf, lookup);
 ast_str_append(&sql, 0, " WHERE `%s` = '%s'", keyfield, ast_str_buffer(buf));

 ast_debug(1, "MySQL RealTime: Update SQL: %s\n", ast_str_buffer(sql));

 /* Execution. */
 if (mysql_real_query(&dbh->handle, ast_str_buffer(sql), ast_str_strlen(sql))) {
 ast_log(LOG_WARNING, "MySQL RealTime: Failed to update database: %s\n", mysql_error(&dbh->handle));
 release_table(table);
 release_database(dbh);
 return -1;
 }

 numrows = mysql_affected_rows(&dbh->handle);
 release_table(table);
 release_database(dbh);

 ast_debug(1, "MySQL RealTime: Updated %" PRIu64 " rows on table: %s\n", numrows, tablename);

 /* From http://dev.mysql.com/doc/mysql/en/mysql-affected-rows.html
 * An integer greater than zero indicates the number of rows affected
 * Zero indicates that no records were updated
 * -1 indicates that the query returned an error (although, if the query failed, it should have been caught above.)
 */

 return (int)numrows;
}

static int update2_mysql(const char *database, const char *tablename, const struct ast_variable *lookup_fields, const struct ast_variable *update_fields)
{
 struct mysql_conn *dbh;
 uint64_t numrows;
 int first;
 const struct ast_variable *field;
 struct ast_str *sql = ast_str_thread_get(&sql_buf, 100), *buf = ast_str_thread_get(&scratch_buf, 100);
 struct ast_str *where = ast_str_thread_get(&sql2_buf, 100);
 struct tables *table;
 struct columns *column = NULL;

 if (!tablename) {
 ast_log(LOG_WARNING, "MySQL RealTime: No table specified.\n");
 return -1;
 }

 if (!(dbh = find_database(database, 1))) {
 ast_log(LOG_ERROR, "Invalid database specified: %s\n", database);
 return -1;
 }

 if (!(table = find_table(database, tablename))) {
 ast_log(LOG_ERROR, "Table '%s' does not exist!!\n", tablename);
 release_database(dbh);
 return -1;
 }

 if (!sql || !buf || !where) {
 release_database(dbh);
 release_table(table);
 return -1;
 }

 ast_str_set(&sql, 0, "UPDATE %s SET", tablename);
 ast_str_set(&where, 0, "WHERE");

 /* Must connect to the server before anything else, as the escape function requires the mysql handle. */
 if (!mysql_reconnect(dbh)) {
 release_table(table);
 release_database(dbh);
 return -1;
 }

 first = 1;
 for (field = lookup_fields; field; field = field->next) {
 if (!(column = find_column(table, field->name))) {
 ast_log(LOG_ERROR, "Updating on column '%s', but that column does not exist within the table '%s'!\n", field->name, tablename);
 release_table(table);
 release_database(dbh);
 return -1;
 }
 ESCAPE_STRING(buf, field->value);
 ast_str_append(&where, 0, "%s `%s` = '%s'", first ? "" : " AND", field->name, ast_str_buffer(buf));
 first = 0;
 }

 first = 1;
 for (field = update_fields; field; field = field->next) {
 /* If the column is not within the table, then skip it */
 if (!(column = find_column(table, field->name))) {
 ast_log(LOG_WARNING, "Attempted to update column '%s' in table '%s', but column does not exist!\n", field->name, tablename);
 continue;
 }

 ESCAPE_STRING(buf, field->value);
 ast_str_append(&sql, 0, "%s `%s` = '%s'", first ? "" : ",", field->name, ast_str_buffer(buf));
 first = 0;
 }

 release_table(table);

 ast_str_append(&sql, 0, " %s", ast_str_buffer(where));

 ast_debug(1, "MySQL RealTime: Update SQL: %s\n", ast_str_buffer(sql));

 /* Execution. */
 if (mysql_real_query(&dbh->handle, ast_str_buffer(sql), ast_str_strlen(sql))) {
 ast_log(LOG_WARNING, "MySQL RealTime: Failed to update database: %s\n", mysql_error(&dbh->handle));
 release_table(table);
 release_database(dbh);
 return -1;
 }

 numrows = mysql_affected_rows(&dbh->handle);
 release_database(dbh);

 ast_debug(1, "MySQL RealTime: Updated %" PRIu64 " rows on table: %s\n", numrows, tablename);

 /* From http://dev.mysql.com/doc/mysql/en/mysql-affected-rows.html
 * An integer greater than zero indicates the number of rows affected
 * Zero indicates that no records were updated
 * -1 indicates that the query returned an error (although, if the query failed, it should have been caught above.)
 */

 return (int)numrows;
}

static int store_mysql(const char *database, const char *table, const struct ast_variable *rt_fields)
{
 struct mysql_conn *dbh;
 struct ast_str *sql = ast_str_thread_get(&sql_buf, 16);
 struct ast_str *sql2 = ast_str_thread_get(&sql2_buf, 16);
 struct ast_str *buf = ast_str_thread_get(&scratch_buf, 16);
 const struct ast_variable *field = rt_fields;

 if (!(dbh = find_database(database, 1))) {
 ast_log(LOG_WARNING, "MySQL RealTime: Invalid database specified: '%s' (check res_mysql.conf)\n", database);
 return -1;
 }

 if (!table) {
 ast_log(LOG_WARNING, "MySQL RealTime: No table specified.\n");
 release_database(dbh);
 return -1;
 }
 /* Get the first parameter and first value in our list of passed paramater/value pairs */
 if (!field) {
 ast_log(LOG_WARNING, "MySQL RealTime: Realtime storage requires at least 1 parameter and 1 value to search on.\n");
 release_database(dbh);
 return -1;
 }
 /* Must connect to the server before anything else, as the escape function requires the mysql handle. */
 if (!mysql_reconnect(dbh)) {
 release_database(dbh);
 return -1;
 }
 /* Create the first part of the query using the first parameter/value pairs we just extracted
 If there is only 1 set, then we have our query. Otherwise, loop thru the list and concat */
 ESCAPE_STRING(buf, field->value);
 ast_str_set(&sql, 0, "INSERT INTO %s (`%s`", table, field->name);
 ast_str_set(&sql2, 0, ") VALUES ('%s'", ast_str_buffer(buf));

 while ((field = field->next)) {
 ESCAPE_STRING(buf, field->value);

 ast_str_append(&sql, 0, ", `%s`", field->name);
 ast_str_append(&sql2, 0, ", '%s'", ast_str_buffer(buf));
 }
 ast_str_append(&sql, 0, "%s)", ast_str_buffer(sql2));
 ast_debug(1,"MySQL RealTime: Insert SQL: %s\n", ast_str_buffer(sql));

 /* Execution. */
 if (mysql_real_query(&dbh->handle, ast_str_buffer(sql), ast_str_strlen(sql))) {
 ast_log(LOG_WARNING, "MySQL RealTime: Failed to insert into database: %s\n", mysql_error(&dbh->handle));
 release_database(dbh);
 return -1;
 }

 release_database(dbh);

 ast_debug(1, "MySQL RealTime: row inserted on table: %s\n", table);

 return 1;
}

static int destroy_mysql(const char *database, const char *table, const char *keyfield, const char *lookup, const struct ast_variable *rt_fields)
{
 struct mysql_conn *dbh;
 uint64_t numrows;
 struct ast_str *sql = ast_str_thread_get(&sql_buf, 16);
 struct ast_str *buf = ast_str_thread_get(&scratch_buf, 16);
 const struct ast_variable *field;

 if (!(dbh = find_database(database, 1))) {
 ast_log(LOG_WARNING, "MySQL RealTime: Invalid database specified: '%s' (check res_mysql.conf)\n", database);
 return -1;
 }

 if (!table) {
 ast_log(LOG_WARNING, "MySQL RealTime: No table specified.\n");
 release_database(dbh);
 return -1;
 }

 /* Get the first parameter and first value in our list of passed paramater/value pairs */
 /* newparam = va_arg(ap, const char *);
 newval = va_arg(ap, const char *);*/
 if (ast_strlen_zero(keyfield) || ast_strlen_zero(lookup)) {
 ast_log(LOG_WARNING, "MySQL RealTime: Realtime destroying requires at least 1 parameter and 1 value to search on.\n");
 release_database(dbh);
 return -1;
 }

 /* Must connect to the server before anything else, as the escape function requires the mysql handle. */
 if (!mysql_reconnect(dbh)) {
 release_database(dbh);
 return -1;
 }

 /* Create the first part of the query using the first parameter/value pairs we just extracted
 If there is only 1 set, then we have our query. Otherwise, loop thru the list and concat */
 ESCAPE_STRING(buf, lookup);
 ast_str_set(&sql, 0, "DELETE FROM %s WHERE `%s` = '%s'", table, keyfield, ast_str_buffer(buf));
 for (field = rt_fields; field; field = field->next) {
 ESCAPE_STRING(buf, field->value);
 ast_str_append(&sql, 0, " AND `%s` = '%s'", field->name, ast_str_buffer(buf));
 }

 ast_debug(1, "MySQL RealTime: Delete SQL: %s\n", ast_str_buffer(sql));

 /* Execution. */
 if (mysql_real_query(&dbh->handle, ast_str_buffer(sql), ast_str_strlen(sql))) {
 ast_log(LOG_WARNING, "MySQL RealTime: Failed to delete from database: %s\n", mysql_error(&dbh->handle));
 release_database(dbh);
 return -1;
 }

 numrows = mysql_affected_rows(&dbh->handle);
 release_database(dbh);

 ast_debug(1, "MySQL RealTime: Deleted %" PRIu64 " rows on table: %s\n", numrows, table);

 /* From http://dev.mysql.com/doc/mysql/en/mysql-affected-rows.html
 * An integer greater than zero indicates the number of rows affected
 * Zero indicates that no records were updated
 * -1 indicates that the query returned an error (although, if the query failed, it should have been caught above.)
 */

 return (int)numrows;
}

static struct ast_config *config_mysql(const char *database, const char *table, const char *file, struct ast_config *cfg, struct ast_flags config_flags, const char *unused, const char *who_asked)
{
 struct mysql_conn *dbh;
 MYSQL_RES *result;
 MYSQL_ROW row;
 uint64_t num_rows;
 struct ast_variable *new_v;
 struct ast_category *cur_cat = NULL;
 struct ast_str *sql = ast_str_thread_get(&sql_buf, 200);
 char last[80] = "";
 int last_cat_metric = 0;

 ast_clear_flag(&config_flags, CONFIG_FLAG_FILEUNCHANGED);

 if (!file || !strcmp(file, RES_CONFIG_MYSQL_CONF)) {
 ast_log(LOG_WARNING, "MySQL RealTime: Cannot configure myself.\n");
 return NULL;
 }

 if (!(dbh = find_database(database, 0))) {
 ast_log(LOG_WARNING, "MySQL RealTime: Invalid database specified: '%s' (check res_mysql.conf)\n", database);
 return NULL;
 }

 ast_str_set(&sql, 0, "SELECT category, var_name, var_val, cat_metric FROM %s WHERE filename='%s' and commented=0 ORDER BY filename, category, cat_metric desc, var_metric asc, var_name, var_val, id", table, file);

 ast_debug(1, "MySQL RealTime: Static SQL: %s\n", ast_str_buffer(sql));

 /* We now have our complete statement; Lets connect to the server and execute it. */
 if (!mysql_reconnect(dbh)) {
 return NULL;
 }

 if (mysql_real_query(&dbh->handle, ast_str_buffer(sql), ast_str_strlen(sql))) {
 ast_log(LOG_WARNING, "MySQL RealTime: Failed to query database. Check debug for more info.\n");
 ast_debug(1, "MySQL RealTime: Query: %s\n", ast_str_buffer(sql));
 ast_debug(1, "MySQL RealTime: Query Failed because: %s\n", mysql_error(&dbh->handle));
 release_database(dbh);
 return NULL;
 }

 if ((result = mysql_store_result(&dbh->handle))) {
 num_rows = mysql_num_rows(result);
 ast_debug(1, "MySQL RealTime: Found %" PRIu64 " rows.\n", num_rows);

 /* There might exist a better way to access the column names other than counting,
 * but I believe that would require another loop that we don't need. */

 while ((row = mysql_fetch_row(result))) {
 if (!strcmp(row[1], "#include")) {
 if (!ast_config_internal_load(row[2], cfg, config_flags, "", who_asked)) {
 mysql_free_result(result);
 release_database(dbh);
 return NULL;
 }
 continue;
 }

 if (strcmp(last, row[0]) || last_cat_metric != atoi(row[3])) {
 cur_cat = ast_category_new_dynamic(row[0]);
 if (!cur_cat) {
 break;
 }
 strcpy(last, row[0]);
 last_cat_metric = atoi(row[3]);
 ast_category_append(cfg, cur_cat);
 }
 new_v = ast_variable_new(row[1], row[2], "");
 if (cur_cat)
 ast_variable_append(cur_cat, new_v);
 }
 } else {
 ast_log(LOG_WARNING, "MySQL RealTime: Could not find config '%s' in database.\n", file);
 }

 mysql_free_result(result);
 release_database(dbh);

 return cfg;
}

static int unload_mysql(const char *database, const char *tablename)
{
 struct tables *cur;
 AST_LIST_LOCK(&mysql_tables);
 AST_LIST_TRAVERSE_SAFE_BEGIN(&mysql_tables, cur, list) {
 if (strcmp(cur->name, tablename) == 0) {
 AST_LIST_REMOVE_CURRENT(list);
 destroy_table(cur);
 break;
 }
 }
 AST_LIST_TRAVERSE_SAFE_END
 AST_LIST_UNLOCK(&mysql_tables);
 return cur ? 0 : -1;
}

static int require_mysql(const char *database, const char *tablename, va_list ap)
{
 struct columns *column;
 struct tables *table = find_table(database, tablename);
 char *elm;
 int type;
 int size;
 int res = 0;

 if (!table) {
 ast_log(LOG_WARNING, "Table %s not found in database. This table should exist if you're using realtime.\n", tablename);
 return -1;
 }

 while ((elm = va_arg(ap, char *))) {
 type = va_arg(ap, require_type);
 size = va_arg(ap, int);

 AST_LIST_TRAVERSE(&table->columns, column, list) {
 if (strcmp(column->name, elm) == 0) {
 /* Char can hold anything, as long as it is large enough */
 if (strncmp(column->type, "char", 4) == 0 || strncmp(column->type, "varchar", 7) == 0) {
 if ((size > column->len) && column->len != -1) {
 ast_log(LOG_WARNING, "Realtime table %s@%s: Column '%s' should be at least %d long, but is only %d long.\n", database, tablename, column->name, size, column->len);
 res = -1;
 }
 } else if (strcasestr(column->type, "unsigned")) {
 if (!ast_rq_is_int(type)) {
 ast_log(LOG_WARNING, "Realtime table %s@%s: column '%s' cannot be type '%s' (need %s)\n",
 database, tablename, column->name, column->type,
 type == RQ_CHAR ? "char" : type == RQ_FLOAT ? "float" :
 type == RQ_DATETIME ? "datetime" : type == RQ_DATE ? "date" : "a rather stiff drink");
 res = -1;
 } else if (strncasecmp(column->type, "tinyint", 1) == 0) {
 if (type != RQ_UINTEGER1) {
 ast_log(LOG_WARNING, "Realtime table %s@%s: column '%s' may not be large enough for " \
 "the required data length: %d (detected stringtype)\n", \
 tablename, database, column->name, size); \
 res = -1; \
 }
 } else if (strncasecmp(column->type, "smallint", 1) == 0) {
 if (type != RQ_UINTEGER1 && type != RQ_INTEGER1 && type != RQ_UINTEGER2) {
 ast_log(LOG_WARNING, "Realtime table %s@%s: column '%s' may not be large enough for " \
 "the required data length: %d (detected stringtype)\n", \
 tablename, database, column->name, size); \
 res = -1; \
 }
 } else if (strncasecmp(column->type, "mediumint", 1) == 0) {
 if (type != RQ_UINTEGER1 && type != RQ_INTEGER1 &&
 type != RQ_UINTEGER2 && type != RQ_INTEGER2 &&
 type != RQ_UINTEGER3) {
 ast_log(LOG_WARNING, "Realtime table %s@%s: column '%s' may not be large enough for " \
 "the required data length: %d (detected stringtype)\n", \
 tablename, database, column->name, size); \
 res = -1; \
 }
 } else if (strncasecmp(column->type, "int", 1) == 0) {
 if (type != RQ_UINTEGER1 && type != RQ_INTEGER1 &&
 type != RQ_UINTEGER2 && type != RQ_INTEGER2 &&
 type != RQ_UINTEGER3 && type != RQ_INTEGER3 &&
 type != RQ_UINTEGER4) {
 ast_log(LOG_WARNING, "Realtime table %s@%s: column '%s' may not be large enough for " \
 "the required data length: %d (detected stringtype)\n", \
 tablename, database, column->name, size); \
 res = -1; \
 }
 } else if (strncasecmp(column->type, "bigint", 1) == 0) {
 if (type != RQ_UINTEGER1 && type != RQ_INTEGER1 &&
 type != RQ_UINTEGER2 && type != RQ_INTEGER2 &&
 type != RQ_UINTEGER3 && type != RQ_INTEGER3 &&
 type != RQ_UINTEGER4 && type != RQ_INTEGER4 &&
 type != RQ_UINTEGER8) {
 ast_log(LOG_WARNING, "Realtime table %s@%s: column '%s' may not be large enough for " \
 "the required data length: %d (detected stringtype)\n", \
 tablename, database, column->name, size); \
 res = -1; \
 }
 }
 } else if (strcasestr(column->type, "int")) {
 if (!ast_rq_is_int(type)) {
 ast_log(LOG_WARNING, "Realtime table %s@%s: column '%s' cannot be type '%s' (need %s)\n",
 database, tablename, column->name, column->type,
 type == RQ_CHAR ? "char" : type == RQ_FLOAT ? "float" :
 type == RQ_DATETIME ? "datetime" : type == RQ_DATE ? "date" :
 "to get a life, rather than writing silly error messages");
 res = -1;
 } else if (strncasecmp(column->type, "tinyint", 1) == 0) {
 if (type != RQ_INTEGER1) {
 ast_log(LOG_WARNING, "Realtime table %s@%s: column '%s' may not be large enough for " \
 "the required data length: %d (detected stringtype)\n", \
 tablename, database, column->name, size); \
 res = -1; \
 }
 } else if (strncasecmp(column->type, "smallint", 1) == 0) {
 if (type != RQ_UINTEGER1 && type != RQ_INTEGER1 && type != RQ_INTEGER2) {
 ast_log(LOG_WARNING, "Realtime table %s@%s: column '%s' may not be large enough for " \
 "the required data length: %d (detected stringtype)\n", \
 tablename, database, column->name, size); \
 res = -1; \
 }
 } else if (strncasecmp(column->type, "mediumint", 1) == 0) {
 if (type != RQ_UINTEGER1 && type != RQ_INTEGER1 &&
 type != RQ_UINTEGER2 && type != RQ_INTEGER2 &&
 type != RQ_INTEGER3) {
 ast_log(LOG_WARNING, "Realtime table %s@%s: column '%s' may not be large enough for " \
 "the required data length: %d (detected stringtype)\n", \
 tablename, database, column->name, size); \
 res = -1; \
 }
 } else if (strncasecmp(column->type, "int", 1) == 0) {
 if (type != RQ_UINTEGER1 && type != RQ_INTEGER1 &&
 type != RQ_UINTEGER2 && type != RQ_INTEGER2 &&
 type != RQ_UINTEGER3 && type != RQ_INTEGER3 &&
 type != RQ_INTEGER4) {
 ast_log(LOG_WARNING, "Realtime table %s@%s: column '%s' may not be large enough for " \
 "the required data length: %d (detected stringtype)\n", \
 tablename, database, column->name, size); \
 res = -1; \
 }
 } else if (strncasecmp(column->type, "bigint", 1) == 0) {
 if (type != RQ_UINTEGER1 && type != RQ_INTEGER1 &&
 type != RQ_UINTEGER2 && type != RQ_INTEGER2 &&
 type != RQ_UINTEGER3 && type != RQ_INTEGER3 &&
 type != RQ_UINTEGER4 && type != RQ_INTEGER4 &&
 type != RQ_INTEGER8) {
 ast_log(LOG_WARNING, "Realtime table %s@%s: column '%s' may not be large enough for " \
 "the required data length: %d (detected stringtype)\n", \
 tablename, database, column->name, size); \
 res = -1; \
 }
 }
 } else if (strncmp(column->type, "float", 5) == 0) {
 if (!ast_rq_is_int(type) && type != RQ_FLOAT) {
 ast_log(LOG_WARNING, "Realtime table %s@%s: Column %s cannot be a %s\n", tablename, database, column->name, column->type);
 res = -1;
 }
 } else if (strncmp(column->type, "datetime", 8) == 0 || strncmp(column->type, "timestamp", 9) == 0) {
 if (type != RQ_DATETIME) {
 ast_log(LOG_WARNING, "Realtime table %s@%s: Column %s cannot be a %s\n", tablename, database, column->name, column->type);
 res = -1;
 }
 } else if (strncmp(column->type, "date", 4) == 0) {
 if (type != RQ_DATE) {
 ast_log(LOG_WARNING, "Realtime table %s@%s: Column %s cannot be a %s\n", tablename, database, column->name, column->type);
 res = -1;
 }
 } else { /* Other, possibly unsupported types? */
 ast_log(LOG_WARNING, "Possibly unsupported column type '%s' on column '%s'\n", column->type, column->name);
 res = -1;
 }
 break;
 }
 }

 if (!column) {
 ast_log(LOG_WARNING, "Table %s requires a column '%s' of size '%d', but no such column exists.\n", tablename, elm, size);
 }
 }
 release_table(table);

 return res;
}

static struct ast_config_engine mysql_engine = {
 .name = "mysql",
 .load_func = config_mysql,
 .realtime_func = realtime_mysql,
 .realtime_multi_func = realtime_multi_mysql,
 .store_func = store_mysql,
 .destroy_func = destroy_mysql,
 .update_func = update_mysql,
 .update2_func = update2_mysql,
 .require_func = require_mysql,
 .unload_func = unload_mysql,
};

static int load_module(void)
{
 parse_config(0);

 ast_config_engine_register(&mysql_engine);
 ast_verb(2, "MySQL RealTime driver loaded.\n");
 ast_cli_register_multiple(cli_realtime_mysql_status, sizeof(cli_realtime_mysql_status) / sizeof(struct ast_cli_entry));
 return 0;
}

static int unload_module(void)
{
 struct mysql_conn *cur;
 struct tables *table;

 ast_cli_unregister_multiple(cli_realtime_mysql_status, sizeof(cli_realtime_mysql_status) / sizeof(struct ast_cli_entry));
 ast_config_engine_deregister(&mysql_engine);
 ast_verb(2, "MySQL RealTime unloaded.\n");

 AST_RWLIST_WRLOCK(&databases);
 while ((cur = AST_RWLIST_REMOVE_HEAD(&databases, list))) {
 mysql_close(&cur->handle);
 ast_mutex_destroy(&cur->lock);
 ast_free(cur);
 }
 AST_RWLIST_UNLOCK(&databases);

 /* Destroy cached table info */
 AST_LIST_LOCK(&mysql_tables);
 while ((table = AST_LIST_REMOVE_HEAD(&mysql_tables, list))) {
 destroy_table(table);
 }
 AST_LIST_UNLOCK(&mysql_tables);

 return 0;
}

static int reload(void)
{
 parse_config(1);
 ast_verb(2, "MySQL RealTime reloaded.\n");
 return 0;
}

static int parse_config(int reload)
{
 struct ast_config *config = NULL;
 struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };
 const char *catg;
 struct mysql_conn *cur;

 if ((config = ast_config_load(RES_CONFIG_MYSQL_CONF, config_flags)) == CONFIG_STATUS_FILEMISSING) {
 /* Support old config file name */
 config = ast_config_load(RES_CONFIG_MYSQL_CONF_OLD, config_flags);
 }

 if (config == CONFIG_STATUS_FILEMISSING) {
 return 0;
 } else if (config == CONFIG_STATUS_FILEUNCHANGED) {
 return 0;
 } else if (config == CONFIG_STATUS_FILEINVALID) {
 ast_log(LOG_ERROR, "Not %sloading " RES_CONFIG_MYSQL_CONF "\n", reload ? "re" : "");
 }

 AST_RWLIST_WRLOCK(&databases);
 for (catg = ast_category_browse(config, NULL); catg; catg = ast_category_browse(config, catg)) {
 /* Does this category already exist? */
 AST_RWLIST_TRAVERSE(&databases, cur, list) {
 if (!strcmp(cur->unique_name, catg)) {
 break;
 }
 }

 if (!cur) {
 if (!(cur = ast_calloc(1, sizeof(*cur) + strlen(catg) + 1))) {
 ast_log(LOG_WARNING, "Could not allocate space for MySQL database '%s'\n", catg);
 continue;
 }

 strcpy(cur->unique_name, catg); /* SAFE */
 ast_mutex_init(&cur->lock);
 AST_RWLIST_INSERT_TAIL(&databases, cur, list);
 }

 load_mysql_config(config, catg, cur);
 }
 AST_RWLIST_UNLOCK(&databases);

 ast_config_destroy(config);

 return 0;
}

static int load_mysql_config(struct ast_config *config, const char *category, struct mysql_conn *conn)
{
 const char *s;

 if (!(s = ast_variable_retrieve(config, category, "dbuser"))) {
 ast_log(LOG_WARNING, "MySQL RealTime: No database user found, using 'asterisk' as default.\n");
 s = "asterisk";
 }
 ast_copy_string(conn->user, s, sizeof(conn->user));

 if (!(s = ast_variable_retrieve(config, category, "dbpass"))) {
 ast_log(LOG_WARNING, "MySQL RealTime: No database password found, using 'asterisk' as default.\n");
 s = "asterisk";
 }
 ast_copy_string(conn->pass, s, sizeof(conn->pass));

 if (!(s = ast_variable_retrieve(config, category, "dbhost"))) {
 ast_log(LOG_WARNING, "MySQL RealTime: No database host found, using localhost via socket.\n");
 s = "";
 }
 ast_copy_string(conn->host, s, sizeof(conn->host));

 if (!(s = ast_variable_retrieve(config, category, "dbname"))) {
 ast_log(LOG_WARNING, "MySQL RealTime: No database name found, using 'asterisk' as default.\n");
 s = "asterisk";
 }
 ast_copy_string(conn->name, s, sizeof(conn->name));

 if (!(s = ast_variable_retrieve(config, category, "dbport"))) {
 ast_log(LOG_WARNING, "MySQL RealTime: No database port found, using 3306 as default.\n");
 conn->port = 3306;
 } else
 conn->port = atoi(s);

 if (!(s = ast_variable_retrieve(config, category, "dbsock"))) {
 if (ast_strlen_zero(conn->host)) {
 char *paths[3] = { "/tmp/mysql.sock", "/var/lib/mysql/mysql.sock", "/var/run/mysqld/mysqld.sock" };
 struct stat st;
 int i;
 for (i = 0; i < 3; i++) {
 if (!stat(paths[i], &st)) {
 ast_log(LOG_WARNING, "MySQL RealTime: No database socket found, using '%s' as default.\n", paths[i]);
 ast_copy_string(conn->sock, paths[i], sizeof(conn->sock));
 }
 }
 if (i == 3) {
 ast_log(LOG_WARNING, "MySQL RealTime: No database socket found (and unable to detect a suitable path).\n");
 return 0;
 }
 }
 } else
 ast_copy_string(conn->sock, s, sizeof(conn->sock));

 if ((s = ast_variable_retrieve(config, category, "dbcharset"))) {
 ast_copy_string(conn->charset, s, sizeof(conn->charset));
 }

 if (!(s = ast_variable_retrieve(config, category, "requirements"))) {
 ast_log(LOG_WARNING, "MySQL realtime: no requirements setting found, using 'warn' as default.\n");
 conn->requirements = RQ_WARN;
 } else if (!strcasecmp(s, "createclose")) {
 conn->requirements = RQ_CREATECLOSE;
 } else if (!strcasecmp(s, "createchar")) {
 conn->requirements = RQ_CREATECHAR;
 } else if (!strcasecmp(s, "warn")) {
 conn->requirements = RQ_WARN;
 } else {
 ast_log(LOG_WARNING, "MySQL realtime: unrecognized requirements setting '%s', using 'warn'\n", s);
 conn->requirements = RQ_WARN;
 }

 if (!ast_strlen_zero(conn->host)) {
 ast_debug(1, "MySQL RealTime host: %s\n", conn->host);
 ast_debug(1, "MySQL RealTime port: %i\n", conn->port);
 } else
 ast_debug(1, "MySQL RealTime socket: %s\n", conn->sock);
 ast_debug(1, "MySQL RealTime database name: %s\n", conn->name);
 ast_debug(1, "MySQL RealTime user: %s\n", conn->user);
 ast_debug(1, "MySQL RealTime password: %s\n", conn->pass);
 if(!ast_strlen_zero(conn->charset))
 ast_debug(1, "MySQL RealTime charset: %s\n", conn->charset);

 return 1;
}

static int mysql_reconnect(struct mysql_conn *conn)
{
#ifdef MYSQL_OPT_RECONNECT
 my_bool trueval = 1;
#endif

 /* mutex lock should have been locked before calling this function. */

reconnect_tryagain:
 if ((!conn->connected) && (!ast_strlen_zero(conn->host) || !ast_strlen_zero(conn->sock)) && !ast_strlen_zero(conn->user) && !ast_strlen_zero(conn->name)) {
 if (!mysql_init(&conn->handle)) {
 ast_log(LOG_WARNING, "MySQL RealTime: Insufficient memory to allocate MySQL resource.\n");
 conn->connected = 0;
 return 0;
 }
 if(strlen(conn->charset) > 2){
 char set_names[255];
 char statement[512];
 snprintf(set_names, sizeof(set_names), "SET NAMES %s", conn->charset);
 mysql_real_escape_string(&conn->handle, statement, set_names, sizeof(set_names));
 mysql_options(&conn->handle, MYSQL_INIT_COMMAND, set_names);
 mysql_options(&conn->handle, MYSQL_SET_CHARSET_NAME, conn->charset);
 }

 if (mysql_real_connect(&conn->handle, conn->host, conn->user, conn->pass, conn->name, conn->port, conn->sock, 0)) {
#ifdef MYSQL_OPT_RECONNECT
 /* The default is no longer to automatically reconnect on failure,
 * (as of 5.0.3) so we have to set that option here. */
 mysql_options(&conn->handle, MYSQL_OPT_RECONNECT, &trueval);
#endif
 ast_debug(1, "MySQL RealTime: Successfully connected to database.\n");
 conn->connected = 1;
 conn->connect_time = time(NULL);
 return 1;
 } else {
 ast_log(LOG_ERROR, "MySQL RealTime: Failed to connect database server %s on %s (err %d). Check debug for more info.\n", conn->name, !ast_strlen_zero(conn->host) ? conn->host : conn->sock, mysql_errno(&conn->handle));
 ast_debug(1, "MySQL RealTime: Cannot Connect (%d): %s\n", mysql_errno(&conn->handle), mysql_error(&conn->handle));
 conn->connected = 0;
 conn->connect_time = 0;
 return 0;
 }
 } else {
 /* MySQL likes to return an error, even if it reconnects successfully.
 * So the postman pings twice. */
 if (mysql_ping(&conn->handle) != 0 && (usleep(1) + 2 > 0) && mysql_ping(&conn->handle) != 0) {
 conn->connected = 0;
 conn->connect_time = 0;
 ast_log(LOG_ERROR, "MySQL RealTime: Ping failed (%d). Trying an explicit reconnect.\n", mysql_errno(&conn->handle));
 ast_debug(1, "MySQL RealTime: Server Error (%d): %s\n", mysql_errno(&conn->handle), mysql_error(&conn->handle));
 goto reconnect_tryagain;
 }

 if (!conn->connected) {
 conn->connected = 1;
 conn->connect_time = time(NULL);
 }

 if (mysql_select_db(&conn->handle, conn->name) != 0) {
 ast_log(LOG_WARNING, "MySQL RealTime: Unable to select database: %s. Still Connected (%u) - %s.\n", conn->name, mysql_errno(&conn->handle), mysql_error(&conn->handle));
 return 0;
 }

 ast_debug(1, "MySQL RealTime: Connection okay.\n");
 return 1;
 }
}

static char *handle_cli_realtime_mysql_cache(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
 struct tables *cur;
 int l, which;
 char *ret = NULL;

 switch (cmd) {
 case CLI_INIT:
 e->command = "realtime mysql cache";
 e->usage =
 "Usage: realtime mysql cache [<database> <table>]\n"
 " Shows table cache for the MySQL RealTime driver\n";
 return NULL;
 case CLI_GENERATE:
 if (a->argc < 4 || a->argc > 5) {
 return NULL;
 }
 l = strlen(a->word);
 which = 0;
 if (a->argc == 5) {
 AST_LIST_LOCK(&mysql_tables);
 AST_LIST_TRAVERSE(&mysql_tables, cur, list) {
 if (!strcasecmp(a->argv[3], cur->database->unique_name) && !strncasecmp(a->word, cur->name, l) && ++which > a->n) {
 ret = ast_strdup(cur->name);
 break;
 }
 }
 AST_LIST_UNLOCK(&mysql_tables);
 } else {
 struct mysql_conn *cur;
 AST_RWLIST_RDLOCK(&databases);
 AST_RWLIST_TRAVERSE(&databases, cur, list) {
 if (!strncasecmp(a->word, cur->unique_name, l) && ++which > a->n) {
 ret = ast_strdup(cur->unique_name);
 break;
 }
 }
 AST_RWLIST_UNLOCK(&databases);
 }
 return ret;
 }

 if (a->argc == 3) {
 /* List of tables */
 AST_LIST_LOCK(&mysql_tables);
 AST_LIST_TRAVERSE(&mysql_tables, cur, list) {
 ast_cli(a->fd, "%20.20s %s\n", cur->database->unique_name, cur->name);
 }
 AST_LIST_UNLOCK(&mysql_tables);
 } else if (a->argc == 4) {
 int found = 0;
 /* List of tables */
 AST_LIST_LOCK(&mysql_tables);
 AST_LIST_TRAVERSE(&mysql_tables, cur, list) {
 if (!strcasecmp(cur->database->unique_name, a->argv[3])) {
 ast_cli(a->fd, "%s\n", cur->name);
 found = 1;
 }
 }
 AST_LIST_UNLOCK(&mysql_tables);
 if (!found) {
 ast_cli(a->fd, "No tables cached within %s database\n", a->argv[3]);
 }
 } else if (a->argc == 5) {
 /* List of columns */
 if ((cur = find_table(a->argv[3], a->argv[4]))) {
 struct columns *col;
 ast_cli(a->fd, "Columns for Table Cache '%s':\n", a->argv[3]);
 ast_cli(a->fd, "%-20.20s %-20.20s %-3.3s\n", "Name", "Type", "Len");
 AST_LIST_TRAVERSE(&cur->columns, col, list) {
 ast_cli(a->fd, "%-20.20s %-20.20s %3d\n", col->name, col->type, col->len);
 }
 release_table(cur);
 } else {
 ast_cli(a->fd, "No such table '%s'\n", a->argv[3]);
 }
 }
 return CLI_SUCCESS;
}

static char *handle_cli_realtime_mysql_status(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
 char status[256], status2[100] = "", type[20];
 char *ret = NULL;
 int ctime = 0, found = 0;
 struct mysql_conn *cur;
 int l = 0, which = 0;

 switch (cmd) {
 case CLI_INIT:
 e->command = "realtime mysql status";
 e->usage =
 "Usage: realtime mysql status [<database>]\n"
 " Shows connection information for the MySQL RealTime driver\n";
 return NULL;
 case CLI_GENERATE:
 if (a->argc == 4) {
 AST_RWLIST_RDLOCK(&databases);
 AST_RWLIST_TRAVERSE(&databases, cur, list) {
 if (!strncasecmp(a->word, cur->unique_name, l) && ++which > a->n) {
 ret = ast_strdup(cur->unique_name);
 break;
 }
 }
 AST_RWLIST_UNLOCK(&databases);
 }
 return ret;
 }

 if (a->argc != 3)
 return CLI_SHOWUSAGE;

 AST_RWLIST_RDLOCK(&databases);
 AST_RWLIST_TRAVERSE(&databases, cur, list) {
 if (a->argc == 3 || (a->argc == 4 && !strcasecmp(a->argv[3], cur->unique_name))) {
 found = 1;

 if (mysql_reconnect(cur)) {
 snprintf(type, sizeof(type), "connected to");
 ctime = time(NULL) - cur->connect_time;
 } else {
 snprintf(type, sizeof(type), "configured for");
 ctime = -1;
 }

 if (!ast_strlen_zero(cur->host)) {
 snprintf(status, sizeof(status), "%s %s %s@%s, port %d", cur->unique_name, type, cur->name, cur->host, cur->port);
 } else {
 snprintf(status, sizeof(status), "%s %s %s on socket file %s", cur->unique_name, type, cur->name, cur->sock);
 }

 if (!ast_strlen_zero(cur->user)) {
 snprintf(status2, sizeof(status2), " with username %s", cur->user);
 } else {
 status2[0] = '\0';
 }

 if (ctime > 31536000) {
 ast_cli(a->fd, "%s%s for %.1f years.\n", status, status2, (double)ctime / 31536000.0);
 } else if (ctime > 86400 * 30) {
 ast_cli(a->fd, "%s%s for %d days.\n", status, status2, ctime / 86400);
 } else if (ctime > 86400) {
 ast_cli(a->fd, "%s%s for %d days, %d hours.\n", status, status2, ctime / 86400, (ctime % 86400) / 3600);
 } else if (ctime > 3600) {
 ast_cli(a->fd, "%s%s for %d hours, %d minutes.\n", status, status2, ctime / 3600, (ctime % 3600) / 60);
 } else if (ctime > 60) {
 ast_cli(a->fd, "%s%s for %d minutes.\n", status, status2, ctime / 60);
 } else if (ctime > -1) {
 ast_cli(a->fd, "%s%s for %d seconds.\n", status, status2, ctime);
 } else {
 ast_cli(a->fd, "%s%s.\n", status, status2);
 }
 }
 }
 AST_RWLIST_UNLOCK(&databases);

 if (!found) {
 ast_cli(a->fd, "No connections configured.\n");
 }
 return CLI_SUCCESS;
}

AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "MySQL RealTime Configuration Driver",
 .support_level = AST_MODULE_SUPPORT_EXTENDED,
 .load = load_module,
 .unload = unload_module,
 .reload = reload,
 .load_pri = AST_MODPRI_REALTIME_DRIVER,
 .requires = "extconfig",
);