pfSense

# HTTP - Audio over HyperText Transfer Protocol (RFC 2616)

# Pattern attributes: good notsofast notsofast subset

# Protocol groups: streaming_audio document_retrieval ietf_draft_standard

# Wiki: http://protocolinfo.org/wiki/HTTP

# Copyright (C) 2008 Matthew Strait, Ethan Sommer; See ../LICENSE

#

# Usually runs on port 80

#

# Contributed by Deepak Seshadri <dseshadri AT broadbandmaritime.com>

#

# This pattern has been tested and is believed to work well.

#

# To get or provide more information about this protocol and/or pattern:

# http://www.protocolinfo.org/wiki/HTTP

# http://lists.sourceforge.net/lists/listinfo/l7-filter-developers

#

# If you use this, you should be aware that:

#

# - they match both simple downloads of audio/video and streaming content.

#

# - blocking based on content-type encourages server

# writers/administrators to misreport content-type (which will just make

# headaches for everyone, including us), so I would strongly recommend

# shaping audio/video down to a speed that discourages use of streaming

# players without actually blocking it.

#

# - obviously, since this is a subset of HTTP, you need to match it

# earlier in your iptables rules than HTTP.

httpaudio

http/(0\.9|1\.0|1\.1)[\x09-\x0d ][1-5][0-9][0-9][\x09-\x0d -~]*(content-type: audio)