Upsilon Pi Epsilon (UPE)

Simpleshare by Michael Hoisie and Barath Raghavan

To use this program, copy the files you want to share in the same
directory as simpleshare.py. 

Essentially, this program starts an HTTP server on the local machine,
and registers the HTTP addresses of the files in opendht (an online
distributed hash table service) through the XML RPC interface (more
information at opendht.org).

Lets say you run `python simpleshare.py file.txt`. First, it generates
the MD5 hash of file.txt. Lets call this H.  Next, it stores the tuple
(H, 'file.txt http://locahost:8181/file.txt') in opendht. When clients
look up the MD5 hash of the file, they will see the filename, as well
as the URL of the file.

Then, it starts an HTTP server in the local directory which serves the
files.


#!/usr/bin/python
# usage: ./simpleshare.py 
import sys, socket,os, SimpleXMLRPCServer, xmlrpclib, sha, SimpleHTTPServer, SocketServer
d=xmlrpclib.ServerProxy('http://opendht.raghavan.org:5851/')
u='http://'+socket.gethostname()+':8181/'
for f in sys.argv[1:]:
    k=sha.new(open(f,'rb').read())
    print 'Sharing: ', f, ": ", k.hexdigest()
    d.put(xmlrpclib.Binary(k.digest()), xmlrpclib.Binary(f+' '+(u+f)),9999,"")
SocketServer.TCPServer(("",8181), SimpleHTTPServer.SimpleHTTPRequestHandler).serve_forever()

Simpleget.py looks in opendht for the data given the MD5 hash. It
should return the file name, and the URL of the file. Then, it
downloads the file through urllib2, and writes it to disk.

#!/usr/bin/python
# usage: ./simpleget.py 
import sys, os, SimpleXMLRPCServer, xmlrpclib, sha, binascii, urllib2
d=xmlrpclib.ServerProxy('http://planetlab13.millennium.berkeley.edu:5851/')
k=xmlrpclib.Binary(binascii.unhexlify(sys.argv[1]))
v, p = d.get(k,1,xmlrpclib.Binary(""),"")
open(v[0].data.split()[0],'wb').write(urllib2.urlopen(v[0].data.split()[1]).read())