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