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From j...@apache.org
Subject [jira] Closed: (DIRSNICKERS-7) Work on BindRequest construction with BERDigester
Date Sun, 18 Apr 2004 20:03:53 GMT
Message:

   The following issue has been closed.

   Resolver: Alex Karasulu
       Date: Sun, 18 Apr 2004 1:02 PM

Completed and checked in the last set of tests to show the bind request being built properly
see commit rev 10086 for details.
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View the issue:
  http://issues.apache.org/jira/browse/DIRSNICKERS-7

Here is an overview of the issue:
---------------------------------------------------------------------
        Key: DIRSNICKERS-7
    Summary: Work on BindRequest construction with BERDigester
       Type: Task

     Status: Closed
   Priority: Major
 Resolution: FIXED

    Project: Directory Snickers
 Components: 
             BER Runtime

   Assignee: Alex Karasulu
   Reporter: Alex Karasulu

    Created: Sun, 4 Apr 2004 10:13 PM
    Updated: Sun, 18 Apr 2004 1:02 PM

Description:
BindRequest for Simple Binding
==============================

* The LOW level BER operation should not have to create objects for simple types that need
to be used with a stack.  These types can be pushed and poped off of primitive stacks which
we have added to the digester.

* We must recognize that there will be different kinds of rules. Some will be non protocol
specific or rather BER specific which will perhaps be used to transform primitive types. 
Other rules will be protocol specific and then there will be PDU specific rules.  We 
found that primitive rule types can be extended for customization.

Now for our specific problem of building a BindRequest lets keep the scope constrained to
simple binds without any controls.  Below we have the raw tag nesting patterns of such a bind
request with the primitive bit turned off:


.|..0x10000000 <-------- SEQUENCE
.|......0x02000000 <-------- INTEGER (messageId)
.|......0x40000000 <-------- BindRequest (APPLICATION 0)
.|..........0x02000000 <-------- INTEGER (version)
.|..........0x04000000 <-------- OCTET STRING (name)
.|..........0x80000000 <-------- OCTET STRING (CONTEXT-SPECIFIC 0) (simple)
.|......0x80000000 <------------ Control (CONTEXT-SPECIFIC 0) (OPTIONAL)
 v
time

The BindRequest pattern would then be { 0x10000000, 0x40000000 } however before it comes the
messageId which we need to create the BindRequest bean.  

A protocol non specific rule can be devised to accumulate and decode the message id integer
by matching for { 0x10000000, 0x02000000 }.  It could be called PrimitiveIntDecodeRule.  Lets
say that it accumulates, decodes and pushes a primitive int onto the primitive int stack for
use later as a parameter.  To summerize this step:

addRule( { 0x10000000, 0x02000000 }, PrimitiveIntDecodeRule ) ;

A PDU specific rule, BindRequestRule would then match the tag pattern, { 0x10000000, 0x40000000
}, pop the primitive int stack, instantiate a BindRequest bean and push it onto the object
stack.

addRule( { 0x10000000, 0x40000000 }, BindRequestRule ) ;

Next we encounter the sequence of members we need for this PDU.  
For the version INTEGER we register the following rule which
extends the PrimitiveIntDecodeRule.

addRule( { 0x10000000, 0x40000000, 0x02000000 }, BindVersionRule ) ;

Continuing on we set the distinguished name of the user that is binding.  The BindNameRule
is derived from the PrimitiveOctetStringRule which pushes the collected octets for the name
field onto the object stack.  The finish() method override after calling the super method
pops the octets off of the stack and uses it for constructing the name field.  Here's the
add for the rule:

addRule( { 0x10000000, 0x40000000, 0x04000000 }, BindNameRule ) ;

Now for the last step we're reading an OCTET STRING that is tagged as a context specific [0]
tag for the simple credentials.  Again this rule extends the PrimitiveOctetStringRule and
encounters the same dynamics.  Here's how it is added:

addRule( { 0x10000000, 0x40000000, 0x80000000 }, BindSimpleCredentialsRule ) ;

Here the rule simply collects the credential data into a byte array and pushes it onto the
object stack.  The finish() method override pops the byte[] off of the object stack and sets
the BindRequest bean's credentials which is the root object as well as the current top of
the object stack.  The rule also sets the 'simple' boolean property to true.  

Finally the LdapBindRequestRule finishes at which point the completed BindRequest bean can
be popped off of the object stack and handed off to a higher facility.

Rules to be created and added:

<ol>
  <li>PrimitiveIntDecodeRule</li>
  <li>BindRequestRule</li>
  <li>BindVersionRule</li>
  <li>BindNameRule</li>
  <li>BindSimpleCredentialsRule</li>
</ol>




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