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"""RPC Server module."""
import sys
import socket
import pickle
from fnmatch import fnmatch
from repr import repr
# Default verbosity (0 = silent, 1 = print connections, 2 = print requests too)
VERBOSE = 1
class Server:
"""RPC Server class. Derive a class to implement a particular service."""
def __init__(self, address, verbose = VERBOSE):
if type(address) == type(0):
address = ('', address)
self._address = address
self._verbose = verbose
self._socket = None
self._socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self._socket.bind(address)
self._socket.listen(1)
self._listening = 1
def _setverbose(self, verbose):
self._verbose = verbose
def __del__(self):
self._close()
def _close(self):
self._listening = 0
if self._socket:
self._socket.close()
self._socket = None
def _serverloop(self):
while self._listening:
self._serve()
def _serve(self):
if self._verbose: print "Wait for connection ..."
conn, address = self._socket.accept()
if self._verbose: print "Accepted connection from %s" % repr(address)
if not self._verify(conn, address):
print "*** Connection from %s refused" % repr(address)
conn.close()
return
rf = conn.makefile('r')
wf = conn.makefile('w')
ok = 1
while ok:
wf.flush()
if self._verbose > 1: print "Wait for next request ..."
ok = self._dorequest(rf, wf)
_valid = ['192.16.201.*', '192.16.197.*', '132.151.1.*', '129.6.64.*']
def _verify(self, conn, address):
host, port = address
for pat in self._valid:
if fnmatch(host, pat): return 1
return 0
def _dorequest(self, rf, wf):
rp = pickle.Unpickler(rf)
try:
request = rp.load()
except EOFError:
return 0
if self._verbose > 1: print "Got request: %s" % repr(request)
try:
methodname, args, id = request
if '.' in methodname:
reply = (None, self._special(methodname, args), id)
elif methodname[0] == '_':
raise NameError, "illegal method name %s" % repr(methodname)
else:
method = getattr(self, methodname)
reply = (None, apply(method, args), id)
except:
reply = (sys.exc_type, sys.exc_value, id)
if id < 0 and reply[:2] == (None, None):
if self._verbose > 1: print "Suppress reply"
return 1
if self._verbose > 1: print "Send reply: %s" % repr(reply)
wp = pickle.Pickler(wf)
wp.dump(reply)
return 1
def _special(self, methodname, args):
if methodname == '.methods':
if not hasattr(self, '_methods'):
self._methods = tuple(self._listmethods())
return self._methods
raise NameError, "unrecognized special method name %s" % repr(methodname)
def _listmethods(self, cl=None):
if not cl: cl = self.__class__
names = cl.__dict__.keys()
names = filter(lambda x: x[0] != '_', names)
names.sort()
for base in cl.__bases__:
basenames = self._listmethods(base)
basenames = filter(lambda x, names=names: x not in names, basenames)
names[len(names):] = basenames
return names
from security import Security
class SecureServer(Server, Security):
def __init__(self, *args):
apply(Server.__init__, (self,) + args)
Security.__init__(self)
def _verify(self, conn, address):
import string
challenge = self._generate_challenge()
conn.send("%d\n" % challenge)
response = ""
while "\n" not in response and len(response) < 100:
data = conn.recv(100)
if not data:
break
response = response + data
try:
response = string.atol(string.strip(response))
except string.atol_error:
if self._verbose > 0:
print "Invalid response syntax", repr(response)
return 0
if not self._compare_challenge_response(challenge, response):
if self._verbose > 0:
print "Invalid response value", repr(response)
return 0
if self._verbose > 1:
print "Response matches challenge. Go ahead!"
return 1