Free to filter out software for linux

webfilt is not a spam filter, but provides a generic web-based interface for Bayesian-style UNIX filters that need occasional training and corrections. It has been tested with SpamProbe and SpamBayes, but should work with other command-line filters too.

The webfilt system works with existing UNIX accounts, and consists of three distinct components that operate independently:

Users procmail recipes and cron jobs. The storelast.sh shell script is invoked by a users .procmailrc and simply saves a size-limited copy of each incoming e-mail message. The destination directory is determined by spam-state, done by procmail processing. A cron job periodically cleans old message copies.

webfiltd, daemon. The daemon component is invoked by inetd, and responds to a number of commands that allow a connecting client to authenticate, read files, and execute remote commands. This is all done with the authenticated users permissions. This daemon accepts just localhost connections.

webfilt.cgi, web interface The CGI program creates the web interface. Running with low privileges, it communicates with the webfiltd daemon over a socket to guarantee privilege isolation. The user logs in using their web browser and can then view recent emails and run commands on certain files (to train the filter).

Hook::Filter is a runtime filtering layer on top of subroutine calls.

SYNOPSIS

Imagine you have a big program using a logging library that exports 3 functions called mydebug, myinfo and mywarn. Those functions generate far too much log, so you want to skip calling them except in some specific circumstances.

In your main program, write:

use Hook::Filter hook => ["mydebug","myinfo","mywarn"];

In all modules making use of the logging library, write:

use Hook::Filter;

Then create a file called ./hook_filter.rules. This file contains boolean expressions that specify when calls to the filtered subroutines should be allowed:

# allow calls to mydebug only inside package My::Filthy:Attempt
is_sub(mydebug) && from_pkg(My::Filthy::Attempt)

# allow all calls to myinfo except from inside packages under the namespace My::Test::
is_sub(myinfo) && !from_pkg(/^My::Test/)

# allow calls to mywarn from function do_stuff in package main
# whose third argument is a message that does not match the string invalid login name
is_sub(mywarn) && from_sub(do_stuff) && from_pkg(main) && !has_arg(3,/invalid login name/)

# all other calls to myinfo, mydebug or mywarn will be skipped

SYNOPSIS, Log::Dispatch

Your program uses Log::Dispatch. You want to enable Hook::Filter on top of the methods log and log_to from Log::Dispatch everywhere at once. And you want to use the filter rules located in /etc/myconf/filter_rules.conf. Easy: in main, write:

use Hook::Filter rules => /etc/myconf/filter_rules.conf, hook => [Log::Dispatch::log,Log::Dispatch::log_to];

Yet Another Filter Proxy project is a preforking, banner filtering, content scanning Perl proxy.



Yet Another Filter Proxy is a proxy to filter out advertising banners and malicious script code from web sites. It is written in Perl and based on an example by Randal L. Schwartz.

For performance reasons it uses preforking to spawn several processes of itself (like Apache does).

Unlike other available proxies (such as Junkbuster), it does blocking by Perl regular expressions on the site content, which allows you to block JavaScript and popups, in addition to normal ads.

Run perldoc yafp.pl for full readme!

bilateral filter is a denoising filter using the same technique as the selective gaussian blur, but with speedups and other enhancements.

The filter is slow when the blur radius is small but speeds up when the radius gets larger, which is the opposite behavior of the selective gaussian blur. Theres also an option for improved denoising of image gradients.

FIR filter Plugin is an effect plugin for XMMS which enables to filter audio data using long FIR (finite impulse response) filters. Typical applications is loudspeaker or room equalization which typically requires filters with more than 300 taps (filter weights).

The FIR filter plugin uses the fftw3 library to perform the filtering using the overlap-and-add method. If fftw3 is not available the plugin will perform the filtering (convolution) in the time-domain which is much less efficient for long filters.

Constrictor is a Python module for parsing, filtering, and delivering mail as a Mail Delivery Agent (like Procmail). Constrictor provides the functionality to easily write a MDA in Python rather than reading some configuration file of its own syntax.
This has the advantages that configurations are readable and self-explanatory (at least, to anyone who knows Python) and that users have the full flexibility of the Python language at their disposal. Constrictor has the ability to deliver to maildir and Unix mbox format mailboxes, as well as bounce, forward, or reject messages.
Constrictor is currently beta software, at best. Im always very leery of software that messes with my mail, since one runs the risk of not only losing messages but, potentially, bouncing mail to great embarassment and chagrin. That said, I am currently using Constrictor on my own mailbox full-time, but, as always, your mileage may vary.
Installation
Constrictor is a single Python module that should be placed either in the directory you intend to invoke your MDA from, or in your Python library directory. The only non-standard module it relies on is the spamd module from the SpamAssassin distribution (available at http://spamassassin.apache.org/full/2.6x/dist/contrib/spamd.py), and only then if you intend to use the "spamassassin()" function to filter your mail (the module is loaded only when that function is called). Constrictor should work on all versions of Python greater than 2.3; it has been tested primarily on 2.3.4, 2.3.5, 2.4.1.
The spamassassin() function connects to a (optionally specified) spamd server (it defaults to localhost). If you do not have a spamd server, you cannot use this function.
For Postfix and Sendmail, edit your ~/.forward to include "|/path/to/filter.py". For more information on invoking this script as an MDA,see your MTAs manual or ask your administrator.
Enhancements:
- This release adds locking code to duplicate database (pickle file used to recognize duplicate messages) access.
- This release contains no known stability or delivery reliability issues, and thus is considered stable.