unixodbc Module

Marco Lorrai


Edited by

Marco Lorrai

Table of Contents

1. Admin Guide
1. Overview
2. Dependencies
2.1. Kamailio Modules
2.2. External Libraries or Applications
3. Parameters
3.1. ping_interval (int)
3.2. auto_reconnect (int)
3.3. use_escape_common (int)
3.4. replace_query (int)
3.5. quote_char (str)
4. Functions
5. Installation and Running
5.1. Installing
5.2. Configuring and Running
2. Developer Guide

List of Examples

1.1. Set the ping_interval parameter
1.2. Set the auto_reconnect parameter
1.3. Set the use_escape_common parameter
1.4. Set the replace_query parameter
1.5. Set the quote_char parameter

Chapter 1. Admin Guide

1. Overview

This module allows to use the unixodbc package with Kamailio. It have been tested with mysql and the odbc connector, but it should work also with other database. The auth_db module works.

For more information, see the http://www.unixodbc.org/ project web page.

To see what DB engines can be used via unixodbc, look at http://www.unixodbc.org/drivers.html.

2. Dependencies

2.1. Kamailio Modules

The following modules must be loaded before this module:

  • No dependencies on other Kamailio modules.

2.2. External Libraries or Applications

The following libraries or applications must be installed before running Kamailio with this module loaded:

  • None.

3. Parameters

3.1. ping_interval (int)

Sets the ping time interval.

Default value is 300 seconds.

Example 1.1. Set the ping_interval parameter

modparam("db_unixodbc", "ping_interval", 600)

3.2. auto_reconnect (int)

Turns on or off the auto_reconnect mode.

Default value is 1, this means it is enabled.

Example 1.2. Set the auto_reconnect parameter

modparam("db_unixodbc", "auto_reconnect", 0)

3.3. use_escape_common (int)

Escape values in query using internal escape_common() function. It escapes single quote ''', double quote '"', backslash '\', and NULL characters.

You should enable this parameter if you know that the ODBC driver considers the above characters as special (for marking begin and end of a value, escape other characters ...). It prevents against SQL injection.

Default value is 0 (0 = disabled; 1 = enabled).

Example 1.3. Set the use_escape_common parameter

modparam("db_unixodbc", "use_escape_common", 1)

3.4. replace_query (int)

Tells if the ODBC replace query is supported by the DB odbc driver.

Default value is 1 seconds.

Example 1.4. Set the replace_query parameter

modparam("db_unixodbc", "replace_query", 0)

3.5. quote_char (str)

The character to be used for quoting the table and column names in database queries.

Default value: not set (no quoting).

Example 1.5. Set the quote_char parameter

modparam("db_unixodbc", "quote_char", "`")

4. Functions


5. Installation and Running

5.1. Installing

Prerequirement: you should first install unixodbc (or another program that implements the odbc standard, such iodbc), your database, and the right connector. Set the DSN in the odbc.ini file and the connector drivers in the odbcinst.ini file.

5.2. Configuring and Running

In the openser.conf file, add the line:

loadmodule "/usr/local/lib/kamailio/modules/db_unixodbc.so"

You should also uncomment this:

loadmodule "/usr/local/lib/kamailio/modules/auth.so"
loadmodule "/usr/local/lib/kamailio/modules/auth_db.so"
modparam("usrloc", "db_mode", 2)
modparam("auth_db", "calculate_ha1", yes)
modparam("auth_db", "password_column", "password")

and setting the DSN specified in the odbc.ini, inserting this with the url adding this line:

modparam("usrloc|auth_db", "db_url", 

replacing my_dsn with the correct value.

HINT: if unixodbc don't want to connect to mysql server, try restarting mysql server with:

shell>safe_mysqld --user=mysql --socket=/var/lib/mysql/mysql.sock

The connector search the socket in /var/lib/mysql/mysql.sock and not in /tmp/mysql.sock

REMARK: Oracle ODBC driver doesn't support ODBC query. To disable its usage and replace the replace query by an update or insert query, use the parameter:

modparam("db_unixodbc", "replace_query", 0)

Chapter 2. Developer Guide

The module implements the Kamailio DB API, in order to be used by other modules.