Received: (qmail 27305 invoked by uid 2012); 7 Feb 1999 16:29:39 -0000
Message-Id: <19990207162939.27304.qmail@hyperreal.org>
Date: 7 Feb 1999 16:29:39 -0000
From: Rainer Scherg <Rainer.Scherg@t-online.de>
Reply-To: Rainer.Scherg@t-online.de
To: apbugs@hyperreal.org
Subject: apache lacks hook for output stream "filter" modules in api
X-Send-Pr-Version: 3.2

>Number:         3854
>Category:       apache-api
>Synopsis:       apache lacks hook for output stream "filter" modules in api
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    apache
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          change-request
>Submitter-Id:   apache
>Arrival-Date:   Sun Feb  7 08:30:00 PST 1999
>Closed-Date:    Sat Aug 12 11:54:59 PDT 2000
>Last-Modified:  Sat Aug 12 11:54:59 PDT 2000
>Originator:     Rainer.Scherg@t-online.de
>Release:        1.3.4
>Organization:
>Environment:
any
>Description:
Right now it's very difficult to implement a filter module in the
(http) output stream of apache. Developing a third party module, which
is able to examine - e.g. the proxy http content stream, can only be developed
by providing a simple - but version dependend - patch to the orig.
apache source code.

E.g.: a school (minors) is using apache proxy to connect to their network
to the internet. There may be a demand of filtering software to prevend
kids of viewing "harzardous" contents. The ProxyBlock directive cannot handle
the contents of html pages, only some servers in the internet.

By providing a hook into the datastream this could be handled by a better way.

IMO, the hook should call a filter function, which should be able to handle
the stream (buffer) in partial steps. The funtion should return a code which
indicates the server whether stream was modified, unmodified, or the server
has to cancel the request (blocked & reason).

I know this is a request which could lead to a very controverse discussion,
but IMO it's very usefull and will enhance apache by a powerfull feature
(e.g. build in virus scanner for proxies on exe files, etc.).

Rainer
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
State-Changed-From-To: open-suspended
State-Changed-By: coar
State-Changed-When: Thu Apr 29 10:29:18 PDT 1999
State-Changed-Why:

This is not something that can be done easily.  What you're
requesting is an effect of something called 'layered I/O'
which is on the wishlist.  I'm suspending this report
so it won't get lost.

State-Changed-From-To: suspended-closed
State-Changed-By: abagchi
State-Changed-When: Sat Aug 12 11:54:58 PDT 2000
State-Changed-Why:
This feature has been added to Apache 2.0.  This is not
currently fully implemented but it will be when Apache 2.0
is released.

Thank you for using Apache.
>Unformatted:
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