
Domain Module

Juha Heinanen

Edited by

Juha Heinanen

   Copyright © 2002, 2003 Juha Heinanen
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   Table of Contents
   1. User's Guide

        1.1. Overview
        1.2. Dependencies
        1.3. Exported Parameters

              1.3.1. db_url (string)
              1.3.2. db_mode (integer)
              1.3.3. domain_table (string)
              1.3.4. domain_column (string)

        1.4. Exported Functions

              1.4.1. is_from_local()

        1.5. FIFO Commands

              1.5.1. domain_reload
              1.5.2. domain_dump

        1.6. Known Limitations

   2. Developer's Guide
   3. Frequently Asked Questions

   List of Examples
   1-1. Setting db_url parameter
   1-2. nonce_expire example
   1-3. Setting domain_table parameter
   1-4. Setting domain_column parameter
   1-5. is_from_local usage
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Chapter 1. User's Guide

1.1. Overview

   Domain module implements checks that based on domain table
   determine if a host part of an URI is "local" or not. A
   "local" domain is one that the proxy is responsible for.

   Domain module operates in caching or non-caching mode
   depending on value of module parameter db_mode. In caching
   mode domain module reads the contents of domain table into
   cache memory when the module is loaded. After that domain
   table is re-read only when module is given domain_reload fifo
   command. Any changes in domain table must thus be followed by
   domain_reload command in order to reflect them in module
   behavior. In non-caching mode domain module always queries
   domain table in the database.

   Caching is implemented using a hash table. The size of the
   hash table is given by HASH_SIZE constant defined in
   domain_mod.h. Its "factory default" value is 128.
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1.2. Dependencies

   The module depends on the following modules (in the other
   words the listed modules must be loaded before this module):

     * database -- Any database module
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1.3. Exported Parameters

1.3.1. db_url (string)

   This is URL of the database to be used.

   Default value is "sql://serro:47serro11@localhost/ser"

   Example 1-1. Setting db_url parameter
modparam("domain", "db_url", "sql://ser:pass@db_host/ser")
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1.3.2. db_mode (integer)

   Database mode. 0 means non-caching, 1 means caching.

   Default value is 0 (non-caching).

   Example 1-2. nonce_expire example
modparam("domain", "db_mode", 1)   # Use chaching
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1.3.3. domain_table (string)

   Name of table containing names of local domains that the proxy
   is responsible for. Local users must have in their sip uri a
   host part that is equal to one of these domains.

   Default value is "domain".

   Example 1-3. Setting domain_table parameter
modparam("domain", "domain_table", "new_name")
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1.3.4. domain_column (string)

   Name of column containing domains in domain table.

   Default value is "domain".

   Example 1-4. Setting domain_column parameter
modparam("domain", "domain_column", "domain_col")
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1.4. Exported Functions

1.4.1. is_from_local()

   Checks based on domain table if host part of From header uri
   is one of the local domains that the proxy is responsible for

   Example 1-5. is_from_local usage
...
if (is_from_local()) {
    ...
};
...
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1.5. FIFO Commands

1.5.1. domain_reload

   Causes domain module to re-read the contents of domain table
   into cache memory.
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1.5.2. domain_dump

   Causes domain module to dump hash indexes and domain names in
   its cache memory.
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1.6. Known Limitations

   There is an unlikely race condition on domain list update. If
   a process uses a table, which is reloaded at the same time
   twice through FIFO, the second reload will delete the original
   table still in use by the process.
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Chapter 2. Developer's Guide

   To be done.
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Chapter 3. Frequently Asked Questions

   3.1. What is the meaning of life ?

   3.1. What is the meaning of life ?

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