
pdt Module

Elena-Ramona Modroiu

   Voice-System

Edited by

Elena-Ramona Modroiu

   Copyright © 2003 Fill in here
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   Table of Contents
   1. User's Guide

        1.1. Overview
        1.2. Dependencies

              1.2.1. SER Modules
              1.2.2. External Libraries or Applications

        1.3. Exported Parameters

              1.3.1. db_url (string)
              1.3.2. db_table (string)
              1.3.3. prefix_column (string)
              1.3.4. domain_column (string)
              1.3.5. prefix (string)
              1.3.6. hsize_2pow (integer)
              1.3.7. sync_time (integer)
              1.3.8. clean_time (integer)

        1.4. Exported Functions

              1.4.1. prefix2domain(mode)

        1.5. Installation & Running

              1.5.1. FIFO Commands

   2. Developer's Guide
   3. Frequently Asked Questions

   List of Examples
   1-1. prefix-domain translation
   1-2. Set db_url parameter
   1-3. Set db_table parameter
   1-4. Set prefix_column parameter
   1-5. Set domain_column parameter
   1-6. Set prefix parameter
   1-7. Set hsize_2pow parameter
   1-8. Set sync_time parameter
   1-9. Set clean_time parameter
   1-10. prefix2domain usage
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Chapter 1. User's Guide

1.1. Overview

   This module translates a numerical prefix into a domain and
   updates accordingly the request URI.

   The module looks up at the R-URI part of a message and if the
   user part begins with an established prefix it will update the
   URI. Updating the uri consists of: remove the prefix from the
   user part of the uri and keep the rest as the user part of the
   new uri. The host and port are changed with the domain matched
   for the leading prefix.

   <prefix><userid><:password>@<mydomain.com> ...

   and the result will be:

   <userid><:password>@<domain[:port]>...

   Example 1-1. prefix-domain translation
prefix=123
domain[123]=alpha.org

sip:12391001@mydomain.com  => sip:91001@alpha.org

   The prefix could be prefixed by other digits. These digits
   will not be used to look up the domain (the classic example,
   00 used for international calls, then follows the country
   prefix). For more information on this, see 'prefix' parameter.

     * A sample config file and the MySQL script to create the
       database needed by PDT are located in './doc/'.
     * Sample shell scripts to manage prefix-domain pairs are
       also located in './doc/' (pdt_fifo_add.sh,
       pdt_fifo_delete.sh, pdt_fifo_list.sh).
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1.2. Dependencies

1.2.1. SER Modules

   The following modules must be loaded before this module:

     * A SER database module (e.g., mysql, dbtext).
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1.2.2. External Libraries or Applications

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

     * None.
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1.3. Exported Parameters

1.3.1. db_url (string)

   SQL URL of database--username, password, host, port and
   database (ex: mysql://username:password@hostname.com/database)

   Default value is "mysql://root@127.0.0.1/pdt". 

   Example 1-2. Set db_url parameter
...
modparam("pdt", "db_url", "mysql://user:xxx@127.0.0.1/ser")
...
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1.3.2. db_table (string)

   Table name.

   Default value is "prefix_domain". 

   Example 1-3. Set db_table parameter
...
modparam("pdt", "db_table", "pdt")
...
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1.3.3. prefix_column (string)

   Name of 'prefix' column.

   Default value is "prefix". 

   Example 1-4. Set prefix_column parameter
...
modparam("pdt", "prefix_column", "code")
...
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1.3.4. domain_column (string)

   Name of 'domain' column.

   Default value is "domain". 

   Example 1-5. Set domain_column parameter
...
modparam("pdt", "domain_column", "hostname")
...
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1.3.5. prefix (string)

   Default leading prefix who denotes what URI needs to be
   translated - if it is NULL the module will not check the R-URI
   against it and the PDT prefix is considered starting from the
   first digit. Otherwise, the module will check first if the
   R-URI starts with it and will skip it to look up the domain.

   Default value is NULL. 

   Example 1-6. Set prefix parameter
...
modparam("pdt", "prefix", "00")
...
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1.3.6. hsize_2pow (integer)

   Number of the hash entries = 2^hash_size.

   Default value is 4. 

   Example 1-7. Set hsize_2pow parameter
...
modparam("pdt", "hsize_2pow", 4)
...
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1.3.7. sync_time (integer)

   Time in seconds to synchronize the cache of each process with
   the changes made through FIFO. Any prefix-domain change made
   through FIFO is guaranteed to have efect after this period of
   time past.

   Default value is 600. 

   Example 1-8. Set sync_time parameter
...
modparam("pdt", "sync_time", 300)
...
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1.3.8. clean_time (integer)

   Time in seconds to clean the changes inserted via FIFO. The
   changes will be removed from FIFO diff list only when all SER
   processes applied these changes.

   Default value is 900. 

   Example 1-9. Set clean_time parameter
...
modparam("pdt", "clean_time", 600)
...
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1.4. Exported Functions

1.4.1. prefix2domain(mode)

   Build a new URI if it is necessary. Returns 1 when the
   translation was made or there was nothing to translate (user
   part of the URI is empty, it does not match the prefix
   parameter or there is no domain associated with a possible
   prefix from user part). Returns -1 in error cases.

   The "mode" parameter specifies whether to strip or not the
   prefix from user part. If the parameter is missing or it has
   the value "0", then the prefix is removed along with the
   leading prefix. If the value is "1", only the leading prefix
   is removed. If the values is "2" the user part of the URI is
   not changed.

   Example 1-10. prefix2domain usage
...
prefix2domain();
...
prefix2domain("2");
...
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1.5. Installation & Running

   Make sure you have created the table needed by this module.
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1.5.1. FIFO Commands

   The modules uses only the cache to look up domains. If you
   want to add or delete a new prefix-domain pair you have to use
   FIFO commands. All changes made via FIFO are applied to
   database. The database is loaded only at SER start up time.

   There are three FIFO commands to use with PDT.

     * pdt_add - add a new prefix-domain pair
     * pdt_delete - remove a prefix-domain pair
     * pdt_list - list the prefixes and the domains

   Example shell scripts for these commands are placed in
   './doc/' (pdt_fifo_add.sh, pdt_fifo_delete.sh,
   pdt_fifo_list.sh). More about, in the comments before the
   implementation of the functions, inside the 'pdt.c' file.
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Chapter 2. Developer's Guide

   No function exported for use in another SER module.
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Chapter 3. Frequently Asked Questions

   3.1. Where can I post a question about this module?
   3.2. How can I report a bug?

   3.1. Where can I post a question about this module?

   First at all check if your question was already answered on
   one of our mailing lists:

     * http://mail.iptel.org/mailman/listinfo/serusers
     * http://mail.iptel.org/mailman/listinfo/serdev

   E-mails regarding any stable version should be sent to
   <serusers@iptel.org> and e-mail regarding development versions
   or CVS snapshots should be send to <serdev@iptel.org>.

   If you want to keep the mail private, send it to
   <ramona@voice-system.ro>.

   3.2. How can I report a bug?

   Please send a mail to <serdev@iptel.org> or to
   <ramona@voice-system.ro>
