P2P miniaturisedLegislators will probably find it hard to stop Peer-to-Peer (P2P) file sharing applications, especially when you can write your own P2P software in 15 lines of Python code :-
# 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"))
or 9 lines of Perl code (docs at
http://ansuz.sooke.bc.ca/software/molester) :-
$p=shift;$a=shift;i(shift);socket S,2,1,6;bind S,&a($a);listen
S,5;$/=undef;while(@ARGV&&($_="$p $a f".shift)||accept(C,S)&&($_=)&&close
C){m!^(.*?) (.*?) ([e-i])([^/]*)/!s&&$1 eq$p&&&$3($2,$4,$');}sub e{open
F,'>',$_[1];print F $_[2];close F}sub f{&s($_,@_)for keys %k}sub
g{open(F,'<',$_[1])&&&s($_[0],$a,"e$_[1]",);close F}sub
h{&s($_[0],$_,'i')for keys %k}sub i{$k{$_[0]}=1}sub
a{$_[0]=~/:/;pack'CxnC4x8',2,$',split'\.',$`}sub
s{socket X,2,1,6;$w=shift;if(connect X,&a($w)){print X
"$p $_[0] $_[1]/$_[2]";close X}else{undef $k{$p}}}
The revolution is here, and its very very small....