Module: sip-router Branch: master Commit: 8431de384b9fb6122203ed7388a26990cd4b025c URL: http://git.sip-router.org/cgi-bin/gitweb.cgi/sip-router/?a=commit;h=8431de38...
Author: Daniel-Constantin Mierla miconda@gmail.com Committer: Daniel-Constantin Mierla miconda@gmail.com Date: Sun Oct 24 20:48:56 2010 +0200
htable: updated example with www auth
- some more details about hash tables
---
modules_k/htable/README | 35 ++++++++++++++++++++++---------- modules_k/htable/doc/htable_admin.xml | 30 ++++++++++++++++++++------- 2 files changed, 46 insertions(+), 19 deletions(-)
diff --git a/modules_k/htable/README b/modules_k/htable/README index 9e8fe6f..facb147 100644 --- a/modules_k/htable/README +++ b/modules_k/htable/README @@ -11,7 +11,7 @@ Elena-Ramona Modroiu
- Copyright � 2008 http://www.asipto.com + Copyright © 2008 http://www.asipto.com __________________________________________________________________
Table of Contents @@ -116,9 +116,21 @@ Chapter 1. Admin Guide
The module adds a hash table container to configuration language. The hash table is stored in shared memory and the access to it can be done - via pseudo-variables: $sht(htname=>name). + via pseudo-variables: $sht(htname=>name). The module supports + definition of many hash tables and can load values at startup from a + database table.
- The "name" can be a static string or can include pseudo- variables that + A typical use case for the SIP server is to implement a cache system in + configuration file - if a value is not found in hash table, load it + from database and store it in hash table so next time the access to it + is very fast. In the definition of the table you can define the default + expiration time of cached items. The expiration time can be adjusted + per itme via assignment operation at runtime. + + You can read more about hash tables at: + http://en.wikipedia.org/wiki/Hash_table. + + The “name” can be a static string or can include pseudo- variables that will be replaced at runtime.
Example 1.1. Accessing $sht(htname=>key) @@ -141,7 +153,7 @@ $sht(a=>$ci::srcip) = $si; the failed authentications per user and one for storing the time of last authentication attempt. To ensure unique name per user, the hash table uses a combination of authentication username and text - "::auth_count" and "::last_auth". + “::auth_count” and “::last_auth”.
Example 1.2. Dictionary attack limitation ... @@ -160,7 +172,7 @@ if(is_present_hf("Authorization")) $sht(a=>$au::auth_count) = 0; } } - if(!www_authorize("")) + if(!www_authenticate("$td", "subscriber")) { switch ($retcode) { case -1: @@ -175,12 +187,12 @@ if(is_present_hf("Authorization")) $sht(a=>$au::last_auth) = $Ts; break; } - www_challenge(""/*realm*/,"0"/*qop*/); + www_challenge("$td"/*realm*/,"0"/*qop*/); exit; } $sht(a=>$au::auth_count) = 0; } else { - www_challenge("","0"); + www_challenge("$td","0"); exit; } ... @@ -243,9 +255,10 @@ if(is_present_hf("Authorization")) * htname - string specifying the name of the hash table. This string is used by $sht(...) to refer to the hash table. * size - number specifying the size of hash table. Larger value means - less collisions. The number of entries in the table is 2^size. The - possible range for this value is from 8 to 14, smaller or larger - values will be increased or decreased respectivly. + less collisions. The number of entries (aka slots or buckets) in + the table is 2^size. The possible range for this value is from 2 to + 14, smaller or larger values will be increased or decreased + respectivly. * autoexpire -time in seconds to delete an item from hash table if no update was done to it. If is missing or set to 0, the items won't expire. @@ -257,7 +270,7 @@ if(is_present_hf("Authorization")) Example 1.3. Set hash_size parameter ... modparam("htable", "htable", "a=>size=4;autoexpire=7200;dbtable=htable_a;") -modparam("htable", "htable", "a=>size=4;autoexpire=7200;dbtable=htable_a;") +modparam("htable", "htable", "b=>size=5;") ...
3.2. db_url (str) diff --git a/modules_k/htable/doc/htable_admin.xml b/modules_k/htable/doc/htable_admin.xml index 1257b6f..e2c2be6 100644 --- a/modules_k/htable/doc/htable_admin.xml +++ b/modules_k/htable/doc/htable_admin.xml @@ -18,7 +18,21 @@ <para> The module adds a hash table container to configuration language. The hash table is stored in shared memory and the access to it can be - done via pseudo-variables: $sht(htname=>name). + done via pseudo-variables: $sht(htname=>name). The module supports + definition of many hash tables and can load values at startup from + a database table. + </para> + <para> + A typical use case for the SIP server is to implement a cache system + in configuration file - if a value is not found in hash table, load + it from database and store it in hash table so next time the access to + it is very fast. In the definition of the table you can define the + default expiration time of cached items. The expiration time can + be adjusted per itme via assignment operation at runtime. + </para> + <para> + You can read more about hash tables at: + http://en.wikipedia.org/wiki/Hash_table. </para> <para> The <quote>name</quote> can be a static string or can include pseudo- @@ -70,7 +84,7 @@ if(is_present_hf("Authorization")) $sht(a=>$au::auth_count) = 0; } } - if(!www_authorize("")) + if(!www_authenticate("$td", "subscriber")) { switch ($retcode) { case -1: @@ -85,12 +99,12 @@ if(is_present_hf("Authorization")) $sht(a=>$au::last_auth) = $Ts; break; } - www_challenge(""/*realm*/,"0"/*qop*/); + www_challenge("$td"/*realm*/,"0"/*qop*/); exit; } $sht(a=>$au::auth_count) = 0; } else { - www_challenge("","0"); + www_challenge("$td","0"); exit; } ... @@ -221,9 +235,9 @@ if(is_present_hf("Authorization")) <para> <emphasis>size</emphasis> - number specifying the size of hash table. Larger value means less collisions. The number of entries - in the table is 2^size. The possible range for this value is from - 8 to 14, smaller or larger values will be increased or decreased - respectivly. + (aka slots or buckets) in the table is 2^size. The possible range + for this value is from 2 to 14, smaller or larger values will be + increased or decreased respectivly. </para> </listitem> <listitem> @@ -250,7 +264,7 @@ if(is_present_hf("Authorization")) <programlisting format="linespecific"> ... modparam("htable", "htable", "a=>size=4;autoexpire=7200;dbtable=htable_a;") -modparam("htable", "htable", "a=>size=4;autoexpire=7200;dbtable=htable_a;") +modparam("htable", "htable", "b=>size=5;") ... </programlisting> </example>
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Daniel-Constantin Mierla