World's Smallest P2P Code.

Alex Halderman and Ed Felten have done it again. They have their fingers in lots of cool pies.... They've made the code available for download, or cut and paste to iron it onto your favorite old T-Shirt. Tasty.

Enjoy:

# tinyp2p.py 1.0 (documentation at http://freedom-to-tinker.com/tinyp2p.html) import sys, os, SimpleXMLRPCServer, xmlrpclib, re, hmac # (C) 2004, E.W. Felten ar,pw,res = (sys.argv,lambda u:hmac.new(sys.argv[1],u).hexdigest(),re.search) pxy,xs = (xmlrpclib.ServerProxy,SimpleXMLRPCServer.SimpleXMLRPCServer) def ls(p=""):return filter(lambda n:(p=="")or res(p,n),os.listdir(os.getcwd())) if ar[2]!="client": # license: http://creativecommons.org/licenses/by-nc-sa/2.0 myU,prs,srv = ("http://"+ar[3]+":"+ar[4], ar[5:],lambda x:x.serve_forever()) def pr(x=[]): return ([(y in prs) or prs.append(y) for y in x] or 1) and prs def c(n): return ((lambda f: (f.read(), f.close()))(file(n)))[0] f=lambda p,n,a:(p==pw(myU))and(((n==0)and pr(a))or((n==1)and [ls(a)])or c(a)) def aug(u): return ((u==myU) and pr()) or pr(pxy(u).f(pw(u),0,pr([myU]))) pr() and [aug(s) for s in aug(pr()[0])] (lambda sv:sv.register_function(f,"f") or srv(sv))(xs((ar[3],int(ar[4])))) for url in pxy(ar[3]).f(pw(ar[3]),0,[]): for fn in filter(lambda n:not n in ls(), (pxy(url).f(pw(url),1,ar[4]))[0]): (lambda fi:fi.write(pxy(url).f(pw(url),2,fn)) or fi.close())(file(fn,"wc"))