func_odbc.c

			res = ast_odbc_ast_str_SQLGetData(&coldata, -1, stmt, x + 1, SQL_CHAR, &indicator);
			if (indicator == SQL_NULL_DATA) {
				ast_debug(3, "Got NULL data\n");
				ast_str_reset(coldata);
				res = SQL_SUCCESS;
			}

			if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
				ast_log(LOG_WARNING, "SQL Get Data error!\n[%s]\n\n", ast_str_buffer(sql));
				y = -1;
				buf[0] = '\0';
				goto end_acf_read;
			}

			ast_debug(2, "Got coldata of '%s'\n", ast_str_buffer(coldata));

			if (x) {
				buf[buflen++] = ',';
			}

			/* Copy data, encoding '\' and ',' for the argument parser */
			ptrcoldata = ast_str_buffer(coldata);
			for (i = 0; i < ast_str_strlen(coldata); i++) {
				if (escapecommas && (ptrcoldata[i] == '\\' || ptrcoldata[i] == ',')) {
					buf[buflen++] = '\\';
				}
				buf[buflen++] = ptrcoldata[i];

				if (buflen >= len - 2) {
					break;
				}

				if (ptrcoldata[i] == '\0') {
					break;
				}
			}

			buf[buflen] = '\0';
			ast_debug(2, "buf is now set to '%s'\n", buf);
		}
		ast_debug(2, "buf is now set to '%s'\n", buf);

		if (resultset) {
			row = ast_calloc(1, sizeof(*row) + buflen + 1);
			if (!row) {
				ast_log(LOG_ERROR, "Unable to allocate space for more rows in this resultset.\n");
				status = "MEMERROR";
				goto end_acf_read;
			}
			strcpy((char *)row + sizeof(*row), buf);
			AST_LIST_INSERT_TAIL(resultset, row, list);

			/* Get next row */
			res = SQLFetch(stmt);
			if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
				if (res != SQL_NO_DATA) {
					ast_log(LOG_WARNING, "Error %d in FETCH [%s]\n", res, ast_str_buffer(sql));
				}
				/* Number of rows in the resultset */
				y++;
				break;
			}
		}
	}

end_acf_read:
	if (!bogus_chan) {
		snprintf(rowcount, sizeof(rowcount), "%d", y);
		pbx_builtin_setvar_helper(chan, "ODBCROWS", rowcount);
		pbx_builtin_setvar_helper(chan, "ODBCSTATUS", status);
		pbx_builtin_setvar_helper(chan, "~ODBCFIELDS~", ast_str_buffer(colnames));
		if (resultset) {
			struct ast_datastore *odbc_store;
			if (multirow) {
				int uid;
				uid = ast_atomic_fetchadd_int(&resultcount, +1) + 1;
				snprintf(buf, len, "%d", uid);
			} else {
				/* Name of the query is name of the resultset */
				ast_copy_string(buf, cmd, len);

				/* If there's one with the same name already, free it */
				ast_channel_lock(chan);
				if ((odbc_store = ast_channel_datastore_find(chan, &odbc_info, buf))) {
					ast_channel_datastore_remove(chan, odbc_store);
					ast_datastore_free(odbc_store);
				}
				ast_channel_unlock(chan);
			}
			odbc_store = ast_datastore_alloc(&odbc_info, buf);
			if (!odbc_store) {
				ast_log(LOG_ERROR, "Rows retrieved, but unable to store it in the channel.  Results fail.\n");
				odbc_datastore_free(resultset);
				SQLCloseCursor(stmt);
				SQLFreeHandle(SQL_HANDLE_STMT, stmt);
				release_obj_or_dsn (&obj, &dsn);
				pbx_builtin_setvar_helper(chan, "ODBCSTATUS", "MEMERROR");
				ast_autoservice_stop(chan);
				return -1;
			}
			odbc_store->data = resultset;
			ast_channel_lock(chan);
			ast_channel_datastore_add(chan, odbc_store);
			ast_channel_unlock(chan);
		}
	}
	SQLCloseCursor(stmt);
	SQLFreeHandle(SQL_HANDLE_STMT, stmt);
	release_obj_or_dsn (&obj, &dsn);
	if (resultset && !multirow) {
		/* Fetch the first resultset */
		if (!acf_fetch(chan, "", buf, buf, len)) {
			buf[0] = '\0';
		}
	}
	if (!bogus_chan) {
		ast_autoservice_stop(chan);
	}
	return 0;
}

static int acf_escape(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len, char character)
{
	char *out = buf;

	for (; *data && out - buf < len; data++) {
		if (*data == character) {
			*out = character;
			out++;
		}
		*out++ = *data;
	}
	*out = '\0';

	return 0;
}

static int acf_escape_ticks(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len)
{
	return acf_escape(chan, cmd, data, buf, len, '\'');
}

static struct ast_custom_function escape_function = {
	.name = "SQL_ESC",
	.read = acf_escape_ticks,
	.write = NULL,
};

static int acf_escape_backslashes(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len)
{
	return acf_escape(chan, cmd, data, buf, len, '\\');
}

static struct ast_custom_function escape_backslashes_function = {
	.name = "SQL_ESC_BACKSLASHES",
	.read = acf_escape_backslashes,
	.write = NULL,
};

static int acf_fetch(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len)
{
	struct ast_datastore *store;
	struct odbc_datastore *resultset;
	struct odbc_datastore_row *row;

	if (!chan) {
		ast_log(LOG_WARNING, "No channel was provided to %s function.\n", cmd);
		return -1;
	}

	ast_channel_lock(chan);
	store = ast_channel_datastore_find(chan, &odbc_info, data);
	if (!store) {
		ast_channel_unlock(chan);
		pbx_builtin_setvar_helper(chan, "ODBC_FETCH_STATUS", "FAILURE");
		return -1;
	}
	resultset = store->data;
	AST_LIST_LOCK(resultset);
	row = AST_LIST_REMOVE_HEAD(resultset, list);
	AST_LIST_UNLOCK(resultset);
	if (!row) {
		/* Cleanup datastore */
		ast_channel_datastore_remove(chan, store);
		ast_datastore_free(store);
		ast_channel_unlock(chan);
		pbx_builtin_setvar_helper(chan, "ODBC_FETCH_STATUS", "FAILURE");
		return -1;
	}
	pbx_builtin_setvar_helper(chan, "~ODBCFIELDS~", resultset->names);
	ast_channel_unlock(chan);
	ast_copy_string(buf, row->data, len);
	ast_free(row);
	pbx_builtin_setvar_helper(chan, "ODBC_FETCH_STATUS", "SUCCESS");
	return 0;
}

static struct ast_custom_function fetch_function = {
	.name = "ODBC_FETCH",
	.read = acf_fetch,
	.write = NULL,
};

static char *app_odbcfinish = "ODBCFinish";

static int exec_odbcfinish(struct ast_channel *chan, const char *data)
{
	struct ast_datastore *store;

	ast_channel_lock(chan);
	store = ast_channel_datastore_find(chan, &odbc_info, data);
	if (store) {
		ast_channel_datastore_remove(chan, store);
		ast_datastore_free(store);
	}
	ast_channel_unlock(chan);
	return 0;
}

static int free_acf_query(struct acf_odbc_query *query)
{
	if (query) {
		if (query->acf) {
			if (query->acf->name)
				ast_free((char *)query->acf->name);
			ast_string_field_free_memory(query->acf);
			ast_free(query->acf);
		}
		ast_free(query->sql_read);
		ast_free(query->sql_write);
		ast_free(query->sql_insert);
		ast_free(query);
	}
	return 0;
}

static int init_acf_query(struct ast_config *cfg, char *catg, struct acf_odbc_query **query)
{
	const char *tmp;
	const char *tmp2 = NULL;
	int i;

	if (!cfg || !catg) {
		return EINVAL;
	}

	if (!(*query = ast_calloc(1, sizeof(**query)))) {
		return ENOMEM;
	}

	if (((tmp = ast_variable_retrieve(cfg, catg, "writehandle"))) || ((tmp = ast_variable_retrieve(cfg, catg, "dsn")))) {
		char *tmp2 = ast_strdupa(tmp);
		AST_DECLARE_APP_ARGS(writeconf,
			AST_APP_ARG(dsn)[5];
		);
		AST_STANDARD_APP_ARGS(writeconf, tmp2);
		for (i = 0; i < 5; i++) {
			if (!ast_strlen_zero(writeconf.dsn[i]))
				ast_copy_string((*query)->writehandle[i], writeconf.dsn[i], sizeof((*query)->writehandle[i]));
		}
	}

	if ((tmp = ast_variable_retrieve(cfg, catg, "readhandle"))) {
		char *tmp2 = ast_strdupa(tmp);
		AST_DECLARE_APP_ARGS(readconf,
			AST_APP_ARG(dsn)[5];
		);
		AST_STANDARD_APP_ARGS(readconf, tmp2);
		for (i = 0; i < 5; i++) {
			if (!ast_strlen_zero(readconf.dsn[i]))
				ast_copy_string((*query)->readhandle[i], readconf.dsn[i], sizeof((*query)->readhandle[i]));
		}
	} else {
		/* If no separate readhandle, then use the writehandle for reading */
		for (i = 0; i < 5; i++) {
			if (!ast_strlen_zero((*query)->writehandle[i]))
				ast_copy_string((*query)->readhandle[i], (*query)->writehandle[i], sizeof((*query)->readhandle[i]));
		}
	}

	if ((tmp = ast_variable_retrieve(cfg, catg, "readsql")) ||
			(tmp2 = ast_variable_retrieve(cfg, catg, "read"))) {
		if (!tmp) {
			ast_log(LOG_WARNING, "Parameter 'read' is deprecated for category %s.  Please use 'readsql' instead.\n", catg);
			tmp = tmp2;
		}
		if (*tmp != '\0') { /* non-empty string */
			if (!((*query)->sql_read = ast_strdup(tmp))) {
				free_acf_query(*query);
				*query = NULL;
				return ENOMEM;
			}
		}
	}

	if ((*query)->sql_read && ast_strlen_zero((*query)->readhandle[0])) {
		free_acf_query(*query);
		*query = NULL;
		ast_log(LOG_ERROR, "There is SQL, but no ODBC class to be used for reading: %s\n", catg);
		return EINVAL;
	}

	if ((tmp = ast_variable_retrieve(cfg, catg, "writesql")) ||
			(tmp2 = ast_variable_retrieve(cfg, catg, "write"))) {
		if (!tmp) {
			ast_log(LOG_WARNING, "Parameter 'write' is deprecated for category %s.  Please use 'writesql' instead.\n", catg);
			tmp = tmp2;
		}
		if (*tmp != '\0') { /* non-empty string */
			if (!((*query)->sql_write = ast_strdup(tmp))) {
				free_acf_query(*query);
				*query = NULL;
				return ENOMEM;
			}
		}
	}

	if ((*query)->sql_write && ast_strlen_zero((*query)->writehandle[0])) {
		free_acf_query(*query);
		*query = NULL;
		ast_log(LOG_ERROR, "There is SQL, but no ODBC class to be used for writing: %s\n", catg);
		return EINVAL;
	}

	if ((tmp = ast_variable_retrieve(cfg, catg, "insertsql"))) {
		if (*tmp != '\0') { /* non-empty string */
			if (!((*query)->sql_insert = ast_strdup(tmp))) {
				free_acf_query(*query);
				*query = NULL;
				return ENOMEM;
			}
		}
	}

	/* Allow escaping of embedded commas in fields to be turned off */
	ast_set_flag((*query), OPT_ESCAPECOMMAS);
	if ((tmp = ast_variable_retrieve(cfg, catg, "escapecommas"))) {
		if (ast_false(tmp))
			ast_clear_flag((*query), OPT_ESCAPECOMMAS);
	}

	if ((tmp = ast_variable_retrieve(cfg, catg, "mode"))) {
		if (strcasecmp(tmp, "multirow") == 0)
			ast_set_flag((*query), OPT_MULTIROW);
		if ((tmp = ast_variable_retrieve(cfg, catg, "rowlimit")))
			sscanf(tmp, "%30d", &((*query)->rowlimit));
	}

	if ((tmp = ast_variable_retrieve(cfg, catg, "minargs"))) {
		sscanf(tmp, "%30d", &((*query)->minargs));
	}

	(*query)->acf = ast_calloc(1, sizeof(struct ast_custom_function));
	if (!(*query)->acf) {
		free_acf_query(*query);
		*query = NULL;
		return ENOMEM;
	}
	if (ast_string_field_init((*query)->acf, 128)) {
		free_acf_query(*query);
		*query = NULL;
		return ENOMEM;
	}

	if ((tmp = ast_variable_retrieve(cfg, catg, "prefix")) && !ast_strlen_zero(tmp)) {
		if (ast_asprintf((char **)&((*query)->acf->name), "%s_%s", tmp, catg) < 0) {
			(*query)->acf->name = NULL;
		}
	} else {
		if (ast_asprintf((char **)&((*query)->acf->name), "ODBC_%s", catg) < 0) {
			(*query)->acf->name = NULL;
		}
	}

	if (!(*query)->acf->name) {
		free_acf_query(*query);
		*query = NULL;
		return ENOMEM;
	}

	if ((tmp = ast_variable_retrieve(cfg, catg, "syntax")) && !ast_strlen_zero(tmp)) {
		ast_string_field_build((*query)->acf, syntax, "%s(%s)", (*query)->acf->name, tmp);
	} else {
		ast_string_field_build((*query)->acf, syntax, "%s(<arg1>[...[,<argN>]])", (*query)->acf->name);
	}

	if (ast_strlen_zero((*query)->acf->syntax)) {
		free_acf_query(*query);
		*query = NULL;
		return ENOMEM;
	}

	if ((tmp = ast_variable_retrieve(cfg, catg, "synopsis")) && !ast_strlen_zero(tmp)) {
		ast_string_field_set((*query)->acf, synopsis, tmp);
	} else {
		ast_string_field_set((*query)->acf, synopsis, "Runs the referenced query with the specified arguments");
	}

	if (ast_strlen_zero((*query)->acf->synopsis)) {
		free_acf_query(*query);
		*query = NULL;
		return ENOMEM;
	}

	if ((*query)->sql_read && (*query)->sql_write) {
		ast_string_field_build((*query)->acf, desc,
					"Runs the following query, as defined in func_odbc.conf, performing\n"
					"substitution of the arguments into the query as specified by ${ARG1},\n"
					"${ARG2}, ... ${ARGn}.  When setting the function, the values are provided\n"
					"either in whole as ${VALUE} or parsed as ${VAL1}, ${VAL2}, ... ${VALn}.\n"
					"%s"
					"\nRead:\n%s\n\nWrite:\n%s%s%s",
					(*query)->sql_insert ?
						"If the write query affects no rows, the insert query will be\n"
						"performed.\n" : "",
					(*query)->sql_read,
					(*query)->sql_write,
					(*query)->sql_insert ? "\n\nInsert:\n" : "",
					(*query)->sql_insert ? (*query)->sql_insert : "");
	} else if ((*query)->sql_read) {
		ast_string_field_build((*query)->acf, desc,
					"Runs the following query, as defined in func_odbc.conf, performing\n"
					"substitution of the arguments into the query as specified by ${ARG1},\n"
					"${ARG2}, ... ${ARGn}.  This function may only be read, not set.\n\nSQL:\n%s",
					(*query)->sql_read);
	} else if ((*query)->sql_write) {
		ast_string_field_build((*query)->acf, desc,
					"Runs the following query, as defined in func_odbc.conf, performing\n"
					"substitution of the arguments into the query as specified by ${ARG1},\n"
					"${ARG2}, ... ${ARGn}.  The values are provided either in whole as\n"
					"${VALUE} or parsed as ${VAL1}, ${VAL2}, ... ${VALn}.\n"
					"This function may only be set.\n%s\nSQL:\n%s%s%s",
					(*query)->sql_insert ?
						"If the write query affects no rows, the insert query will be\n"
						"performed.\n" : "",
					(*query)->sql_write,
					(*query)->sql_insert ? "\n\nInsert:\n" : "",
					(*query)->sql_insert ? (*query)->sql_insert : "");
	} else {
		free_acf_query(*query);
		*query = NULL;
		ast_log(LOG_WARNING, "Section '%s' was found, but there was no SQL to execute.  Ignoring.\n", catg);
		return EINVAL;
	}

	if (ast_strlen_zero((*query)->acf->desc)) {
		free_acf_query(*query);
		*query = NULL;
		return ENOMEM;
	}

	if ((*query)->sql_read) {
		(*query)->acf->read = acf_odbc_read;
	}

	if ((*query)->sql_write) {
		(*query)->acf->write = acf_odbc_write;
	}

	return 0;
}

static char *cli_odbc_read(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
	AST_DECLARE_APP_ARGS(args,
		AST_APP_ARG(field)[100];
	);
	struct ast_str *sql;
	char *char_args, varname[15];
	struct acf_odbc_query *query;
	struct ast_channel *chan;
	int i;

	switch (cmd) {
	case CLI_INIT:
		e->command = "odbc read";
		e->usage =
			"Usage: odbc read <name> <args> [exec]\n"
			"       Evaluates the SQL provided in the ODBC function <name>, and\n"
			"       optionally executes the function.  This function is intended for\n"
			"       testing purposes.  Remember to quote arguments containing spaces.\n";
		return NULL;
	case CLI_GENERATE:
		if (a->pos == 2) {
			int wordlen = strlen(a->word), which = 0;
			/* Complete function name */
			AST_RWLIST_RDLOCK(&queries);
			AST_RWLIST_TRAVERSE(&queries, query, list) {
				if (!strncasecmp(query->acf->name, a->word, wordlen)) {
					if (++which > a->n) {
						char *res = ast_strdup(query->acf->name);
						AST_RWLIST_UNLOCK(&queries);
						return res;
					}
				}
			}
			AST_RWLIST_UNLOCK(&queries);
			return NULL;
		} else if (a->pos == 4) {
			static const char * const completions[] = { "exec", NULL };
			return ast_cli_complete(a->word, completions, a->n);
		} else {
			return NULL;
		}
	}

	if (a->argc < 4 || a->argc > 5) {
		return CLI_SHOWUSAGE;
	}

	sql = ast_str_thread_get(&sql_buf, 16);
	if (!sql) {
		return CLI_FAILURE;
	}

	AST_RWLIST_RDLOCK(&queries);
	AST_RWLIST_TRAVERSE(&queries, query, list) {
		if (!strcmp(query->acf->name, a->argv[2])) {
			break;
		}
	}

	if (!query) {
		ast_cli(a->fd, "No such query '%s'\n", a->argv[2]);
		AST_RWLIST_UNLOCK(&queries);
		return CLI_SHOWUSAGE;
	}

	if (!query->sql_read) {
		ast_cli(a->fd, "The function %s has no readsql parameter.\n", a->argv[2]);
		AST_RWLIST_UNLOCK(&queries);
		return CLI_SUCCESS;
	}

	ast_str_make_space(&sql, strlen(query->sql_read) * 2 + 300);

	/* Evaluate function */
	char_args = ast_strdupa(a->argv[3]);

	chan = ast_dummy_channel_alloc();
	if (!chan) {
		AST_RWLIST_UNLOCK(&queries);
		return CLI_FAILURE;
	}

	AST_STANDARD_APP_ARGS(args, char_args);
	for (i = 0; i < args.argc; i++) {
		snprintf(varname, sizeof(varname), "ARG%d", i + 1);
		pbx_builtin_pushvar_helper(chan, varname, args.field[i]);
	}

	ast_str_substitute_variables(&sql, 0, chan, query->sql_read);
	chan = ast_channel_unref(chan);

	if (a->argc == 5 && !strcmp(a->argv[4], "exec")) {
		/* Execute the query */
		struct odbc_obj *obj = NULL;
		struct dsn *dsn = NULL;
		int dsn_num, executed = 0;
		SQLHSTMT stmt;
		int rows = 0, res, x;
		SQLSMALLINT colcount = 0, collength;
		SQLLEN indicator, octetlength;
		struct ast_str *coldata = ast_str_thread_get(&coldata_buf, 16);
		char colname[256];

		if (!coldata) {
			AST_RWLIST_UNLOCK(&queries);
			return CLI_SUCCESS;
		}

		for (dsn_num = 0; dsn_num < 5; dsn_num++) {
			if (ast_strlen_zero(query->readhandle[dsn_num])) {
				continue;
			}
			obj = get_odbc_obj(query->readhandle[dsn_num], &dsn);
			if (!obj) {
				continue;
			}
			ast_debug(1, "Found handle %s\n", query->readhandle[dsn_num]);

			if (!(stmt = ast_odbc_direct_execute(obj, generic_execute, ast_str_buffer(sql)))) {
				release_obj_or_dsn (&obj, &dsn);
				continue;
			}

			executed = 1;

			res = SQLNumResultCols(stmt, &colcount);
			if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
				ast_cli(a->fd, "SQL Column Count error!\n[%s]\n\n", ast_str_buffer(sql));
				SQLCloseCursor(stmt);
				SQLFreeHandle (SQL_HANDLE_STMT, stmt);
				release_obj_or_dsn (&obj, &dsn);
				AST_RWLIST_UNLOCK(&queries);
				return CLI_SUCCESS;
			}

			if (colcount <= 0) {
				SQLCloseCursor(stmt);
				SQLFreeHandle (SQL_HANDLE_STMT, stmt);
				release_obj_or_dsn (&obj, &dsn);
				ast_cli(a->fd, "Returned %d columns.  Query executed on handle %d:%s [%s]\n", colcount, dsn_num, query->readhandle[dsn_num], ast_str_buffer(sql));
				AST_RWLIST_UNLOCK(&queries);
				return CLI_SUCCESS;
			}

			res = SQLFetch(stmt);
			if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
				SQLCloseCursor(stmt);
				SQLFreeHandle(SQL_HANDLE_STMT, stmt);
				release_obj_or_dsn (&obj, &dsn);
				if (res == SQL_NO_DATA) {
					ast_cli(a->fd, "Returned %d rows.  Query executed on handle %d:%s [%s]\n", rows, dsn_num, query->readhandle[dsn_num], ast_str_buffer(sql));
					break;
				} else {
					ast_cli(a->fd, "Error %d in FETCH [%s]\n", res, ast_str_buffer(sql));
				}
				AST_RWLIST_UNLOCK(&queries);
				return CLI_SUCCESS;
			}
			for (;;) {
				for (x = 0; x < colcount; x++) {
					res = SQLDescribeCol(stmt, x + 1, (unsigned char *)colname, sizeof(colname), &collength, NULL, NULL, NULL, NULL);
					if (((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) || collength == 0) {
						snprintf(colname, sizeof(colname), "field%d", x);
					}

					octetlength = 0;
					SQLColAttribute(stmt, x + 1, SQL_DESC_OCTET_LENGTH, NULL, 0, NULL, &octetlength);

					res = ast_odbc_ast_str_SQLGetData(&coldata, octetlength + 1, stmt, x + 1, SQL_CHAR, &indicator);
					if (indicator == SQL_NULL_DATA) {
						ast_str_set(&coldata, 0, "(nil)");
						res = SQL_SUCCESS;
					}

					if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
						ast_cli(a->fd, "SQL Get Data error %d!\n[%s]\n\n", res, ast_str_buffer(sql));
						SQLCloseCursor(stmt);
						SQLFreeHandle(SQL_HANDLE_STMT, stmt);
						release_obj_or_dsn (&obj, &dsn);
						AST_RWLIST_UNLOCK(&queries);
						return CLI_SUCCESS;
					}

					ast_cli(a->fd, "%-20.20s  %s\n", colname, ast_str_buffer(coldata));
				}
				rows++;

				/* Get next row */
				res = SQLFetch(stmt);
				if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
					break;
				}
				ast_cli(a->fd, "%-20.20s  %s\n", "----------", "----------");
			}
			SQLCloseCursor(stmt);
			SQLFreeHandle(SQL_HANDLE_STMT, stmt);
			release_obj_or_dsn (&obj, &dsn);
			ast_cli(a->fd, "Returned %d row%s.  Query executed on handle %d [%s]\n", rows, rows == 1 ? "" : "s", dsn_num, query->readhandle[dsn_num]);
			break;
		}
		release_obj_or_dsn (&obj, &dsn);

		if (!executed) {
			ast_cli(a->fd, "Failed to execute query. [%s]\n", ast_str_buffer(sql));
		}
	} else { /* No execution, just print out the resulting SQL */
		ast_cli(a->fd, "%s\n", ast_str_buffer(sql));
	}
	AST_RWLIST_UNLOCK(&queries);
	return CLI_SUCCESS;
}

static char *cli_odbc_write(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
	AST_DECLARE_APP_ARGS(values,
		AST_APP_ARG(field)[100];
	);
	AST_DECLARE_APP_ARGS(args,
		AST_APP_ARG(field)[100];
	);
	struct ast_str *sql;
	char *char_args, *char_values, varname[15];
	struct acf_odbc_query *query;
	struct ast_channel *chan;
	int i;

	switch (cmd) {
	case CLI_INIT:
		e->command = "odbc write";
		e->usage =
			"Usage: odbc write <name> <args> <value> [exec]\n"
			"       Evaluates the SQL provided in the ODBC function <name>, and\n"
			"       optionally executes the function.  This function is intended for\n"
			"       testing purposes.  Remember to quote arguments containing spaces.\n";
		return NULL;
	case CLI_GENERATE:
		if (a->pos == 2) {
			int wordlen = strlen(a->word), which = 0;
			/* Complete function name */
			AST_RWLIST_RDLOCK(&queries);
			AST_RWLIST_TRAVERSE(&queries, query, list) {
				if (!strncasecmp(query->acf->name, a->word, wordlen)) {
					if (++which > a->n) {
						char *res = ast_strdup(query->acf->name);
						AST_RWLIST_UNLOCK(&queries);
						return res;
					}
				}
			}
			AST_RWLIST_UNLOCK(&queries);
			return NULL;
		} else if (a->pos == 5) {
			static const char * const completions[] = { "exec", NULL };
			return ast_cli_complete(a->word, completions, a->n);
		} else {
			return NULL;
		}
	}

	if (a->argc < 5 || a->argc > 6) {
		return CLI_SHOWUSAGE;
	}

	sql = ast_str_thread_get(&sql_buf, 16);
	if (!sql) {
		return CLI_FAILURE;
	}

	AST_RWLIST_RDLOCK(&queries);
	AST_RWLIST_TRAVERSE(&queries, query, list) {
		if (!strcmp(query->acf->name, a->argv[2])) {
			break;
		}
	}

	if (!query) {
		ast_cli(a->fd, "No such query '%s'\n", a->argv[2]);
		AST_RWLIST_UNLOCK(&queries);
		return CLI_SHOWUSAGE;
	}

	if (!query->sql_write) {
		ast_cli(a->fd, "The function %s has no writesql parameter.\n", a->argv[2]);
		AST_RWLIST_UNLOCK(&queries);
		return CLI_SUCCESS;
	}

	/* FIXME: The code below duplicates code found in acf_odbc_write but
	 * lacks the newer sql_insert additions. */

	ast_str_make_space(&sql, strlen(query->sql_write) * 2 + 300);

	/* Evaluate function */
	char_args = ast_strdupa(a->argv[3]);
	char_values = ast_strdupa(a->argv[4]);

	chan = ast_dummy_channel_alloc();
	if (!chan) {
		AST_RWLIST_UNLOCK(&queries);
		return CLI_FAILURE;
	}

	AST_STANDARD_APP_ARGS(args, char_args);
	for (i = 0; i < args.argc; i++) {
		snprintf(varname, sizeof(varname), "ARG%d", i + 1);
		pbx_builtin_pushvar_helper(chan, varname, args.field[i]);
	}

	/* Parse values, just like arguments */
	AST_STANDARD_APP_ARGS(values, char_values);
	for (i = 0; i < values.argc; i++) {
		snprintf(varname, sizeof(varname), "VAL%d", i + 1);
		pbx_builtin_pushvar_helper(chan, varname, values.field[i]);
	}

	/* Additionally set the value as a whole (but push an empty string if value is NULL) */
	pbx_builtin_pushvar_helper(chan, "VALUE", S_OR(a->argv[4], ""));
	ast_str_substitute_variables(&sql, 0, chan, query->sql_write);
	ast_debug(1, "SQL is %s\n", ast_str_buffer(sql));

	chan = ast_channel_unref(chan);

	if (a->argc == 6 && !strcmp(a->argv[5], "exec")) {
		/* Execute the query */
		struct odbc_obj *obj = NULL;
		struct dsn *dsn = NULL;
		int dsn_num, executed = 0;
		SQLHSTMT stmt;
		SQLLEN rows = -1;

		for (dsn_num = 0; dsn_num < 5; dsn_num++) {
			if (ast_strlen_zero(query->writehandle[dsn_num])) {
				continue;
			}
			obj = get_odbc_obj(query->writehandle[dsn_num], &dsn);
			if (!obj) {
				continue;
			}
			if (!(stmt = ast_odbc_direct_execute(obj, generic_execute, ast_str_buffer(sql)))) {
				release_obj_or_dsn (&obj, &dsn);
				continue;
			}

			SQLRowCount(stmt, &rows);
			SQLCloseCursor(stmt);
			SQLFreeHandle(SQL_HANDLE_STMT, stmt);
			release_obj_or_dsn (&obj, &dsn);
			ast_cli(a->fd, "Affected %d rows.  Query executed on handle %d [%s]\n", (int)rows, dsn_num, query->writehandle[dsn_num]);
			executed = 1;
			break;
		}

		if (!executed) {
			ast_cli(a->fd, "Failed to execute query.\n");
		}
	} else { /* No execution, just print out the resulting SQL */
		ast_cli(a->fd, "%s\n", ast_str_buffer(sql));
	}
	AST_RWLIST_UNLOCK(&queries);
	return CLI_SUCCESS;
}

static struct ast_cli_entry cli_func_odbc[] = {
	AST_CLI_DEFINE(cli_odbc_write, "Test setting a func_odbc function"),
	AST_CLI_DEFINE(cli_odbc_read, "Test reading a func_odbc function"),
};

static int load_module(void)
{
	int res = 0;
	struct ast_config *cfg;
	char *catg;
	const char *s;
	struct ast_flags config_flags = { 0 };

	res |= ast_custom_function_register(&fetch_function);
	res |= ast_register_application_xml(app_odbcfinish, exec_odbcfinish);

	cfg = ast_config_load(config, config_flags);
	if (!cfg || cfg == CONFIG_STATUS_FILEINVALID) {
		ast_log(LOG_NOTICE, "Unable to load config for func_odbc: %s\n", config);
		return AST_MODULE_LOAD_DECLINE;
	}

	ast_rwlock_wrlock(&single_db_connection_lock);
	if ((s = ast_variable_retrieve(cfg, "general", "single_db_connection"))) {
		single_db_connection = ast_true(s);
	} else {
		single_db_connection = DEFAULT_SINGLE_DB_CONNECTION;
	}

	dsns = NULL;

	if (single_db_connection) {
		dsns = ao2_container_alloc_hash(AO2_ALLOC_OPT_LOCK_MUTEX, 0, DSN_BUCKETS,
			dsn_hash, NULL, dsn_cmp);
		if (!dsns) {
			ast_log(LOG_ERROR, "Could not initialize DSN container\n");
			ast_rwlock_unlock(&single_db_connection_lock);
			return AST_MODULE_LOAD_DECLINE;
		}
	}
	ast_rwlock_unlock(&single_db_connection_lock);

	AST_RWLIST_WRLOCK(&queries);
	for (catg = ast_category_browse(cfg, NULL);
	     catg;
	     catg = ast_category_browse(cfg, catg)) {
		struct acf_odbc_query *query = NULL;
		int err;

		if (!strcasecmp(catg, "general")) {
			continue;
		}

		if ((err = init_acf_query(cfg, catg, &query))) {
			if (err == ENOMEM)
				ast_log(LOG_ERROR, "Out of memory\n");
			else if (err == EINVAL)
				ast_log(LOG_ERROR, "Invalid parameters for category %s\n", catg);
			else
				ast_log(LOG_ERROR, "%s (%d)\n", strerror(err), err);
		} else {
			AST_RWLIST_INSERT_HEAD(&queries, query, list);
			ast_custom_function_register(query->acf);
		}
	}

	ast_config_destroy(cfg);
	res |= ast_custom_function_register(&escape_function);
	res |= ast_custom_function_register(&escape_backslashes_function);
	ast_cli_register_multiple(cli_func_odbc, ARRAY_LEN(cli_func_odbc));

	AST_RWLIST_UNLOCK(&queries);
	return res;
}

static int unload_module(void)
{
	struct acf_odbc_query *query;
	int res = 0;

	AST_RWLIST_WRLOCK(&queries);
	while (!AST_RWLIST_EMPTY(&queries)) {
		query = AST_RWLIST_REMOVE_HEAD(&queries, list);
		ast_custom_function_unregister(query->acf);
		free_acf_query(query);
	}

	res |= ast_custom_function_unregister(&escape_function);
	res |= ast_custom_function_unregister(&escape_backslashes_function);
	res |= ast_custom_function_unregister(&fetch_function);
	res |= ast_unregister_application(app_odbcfinish);
	ast_cli_unregister_multiple(cli_func_odbc, ARRAY_LEN(cli_func_odbc));

	/* Allow any threads waiting for this lock to pass (avoids a race) */
	AST_RWLIST_UNLOCK(&queries);
	usleep(1);
	AST_RWLIST_WRLOCK(&queries);

	AST_RWLIST_UNLOCK(&queries);

	if (dsns) {
		ao2_ref(dsns, -1);
	}
	return res;
}

static int reload(void)
{
	int res = 0;
	struct ast_config *cfg;
	struct acf_odbc_query *oldquery;
	char *catg;
	const char *s;
	struct ast_flags config_flags = { CONFIG_FLAG_FILEUNCHANGED };

	cfg = ast_config_load(config, config_flags);
	if (cfg == CONFIG_STATUS_FILEUNCHANGED || cfg == CONFIG_STATUS_FILEINVALID)
		return 0;

	ast_rwlock_wrlock(&single_db_connection_lock);

	if (dsns) {
		ao2_ref(dsns, -1);
		dsns = NULL;
	}

	if (cfg && (s = ast_variable_retrieve(cfg, "general", "single_db_connection"))) {
		single_db_connection = ast_true(s);
	} else {
		single_db_connection = DEFAULT_SINGLE_DB_CONNECTION;
	}

	if (single_db_connection) {
		dsns = ao2_container_alloc_hash(AO2_ALLOC_OPT_LOCK_MUTEX, 0, DSN_BUCKETS,
			dsn_hash, NULL, dsn_cmp);
		if (!dsns) {
			ast_log(LOG_ERROR, "Could not initialize DSN container\n");
			ast_rwlock_unlock(&single_db_connection_lock);
			return 0;
		}
	}
	ast_rwlock_unlock(&single_db_connection_lock);

	AST_RWLIST_WRLOCK(&queries);

	while (!AST_RWLIST_EMPTY(&queries)) {
		oldquery = AST_RWLIST_REMOVE_HEAD(&queries, list);
		ast_custom_function_unregister(oldquery->acf);
		free_acf_query(oldquery);
	}

	if (!cfg) {
		ast_log(LOG_WARNING, "Unable to load config for func_odbc: %s\n", config);
		goto reload_out;
	}

	for (catg = ast_category_browse(cfg, NULL);
	     catg;
	     catg = ast_category_browse(cfg, catg)) {
		struct acf_odbc_query *query = NULL;

		if (!strcasecmp(catg, "general")) {
			continue;
		}

		if (init_acf_query(cfg, catg, &query)) {
			ast_log(LOG_ERROR, "Cannot initialize query %s\n", catg);
		} else {
			AST_RWLIST_INSERT_HEAD(&queries, query, list);
			ast_custom_function_register(query->acf);
		}
	}

	ast_config_destroy(cfg);
reload_out: