They see me wiresharkin'... they hatin'...

gistfile1.py

#!/usr/bin/env python

"""
This Python scripts listens for all HTTP requests to the
Turntable CDNs and downloads the file requested into the
current directory.

Disclaimer: This is a proof of concept. The author of this
script is not responsible for how this is used.
"""

import os
import re
import shlex
import subprocess

# A set to keep track of all the songs we already downloaded
downloaded = set()

# Execute tshark::
#   * Listen for TCP connections
#   * Listen for HTTP requesting limelight or static turntable host
#   * Output the full request URI of the HTTP request
command = "/usr/local/bin/tshark -l -f tcp -R 'http.host == \"fp-limelight.musicnet.com\" or http.host == \"static.turntable.fm\"' -z 'proto,colinfo,http.request.full_uri,http.request.full_uri'"
process = subprocess.Popen(shlex.split(command),
                           stdout=subprocess.PIPE,
                           stderr=open(os.devnull))

while True:
    line = process.stdout.readline()
    if not line: break

    # Parse the full URL from the line if available
    regex = r".*http\.request\.full_uri == \"(.+)\""
    match = re.match(regex, line)
    if not match: continue

    # Extract the capture which contains the URL
    url = match.group(1)

    # Ignore URLs we've already downloaded
    if url in downloaded: continue

    # Download the new song and add it to the set of downloaded
    # to make sure we never download it again.
    print "Downloading: %s" % url
    downloaded.add(url)
    subprocess.call(shlex.split("/usr/bin/curl -O %s" % url))