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""" Banana -- s-exp based protocol. Future Plans: This module is almost entirely stable. The same caveat applies to it as applies to L{twisted.spread.jelly}, however. Read its future plans for more details. @author: Glyph Lefkowitz """ from __future__ import absolute_import, division import copy, struct from io import BytesIO from twisted.internet import protocol from twisted.persisted import styles from twisted.python import log from twisted.python.compat import iterbytes, long, _bytesChr as chr from twisted.python.reflect import fullyQualifiedName class BananaError(Exception): pass def int2b128(integer, stream): if integer == 0: stream(chr(0)) return assert integer > 0, "can only encode positive integers" while integer: stream(chr(integer & 0x7f)) integer = integer >> 7 def b1282int(st): """ Convert an integer represented as a base 128 string into an L{int} or L{long}. @param st: The integer encoded in a byte string. @type st: L{bytes} @return: The integer value extracted from the byte string. @rtype: L{int} or L{long} """ e = 1 i = 0 for char in iterbytes(st): n = ord(char) i += (n * e) e <<= 7 return i # delimiter characters. LIST = chr(0x80) INT = chr(0x81) STRING = chr(0x82) NEG = chr(0x83) FLOAT = chr(0x84) # "optional" -- these might be refused by a low-level implementation. LONGINT = chr(0x85) LONGNEG = chr(0x86) # really optional; this is part of the 'pb' vocabulary VOCAB = chr(0x87) HIGH_BIT_SET = chr(0x80) def setPrefixLimit(limit): """ Set the limit on the prefix length for all Banana connections established after this call. The prefix length limit determines how many bytes of prefix a banana decoder will allow before rejecting a potential object as too large. @type limit: L{int} @param limit: The number of bytes of prefix for banana to allow when decoding. """ global _PREFIX_LIMIT _PREFIX_LIMIT = limit _PREFIX_LIMIT = None setPrefixLimit(64) SIZE_LIMIT = 640 * 1024 # 640k is all you'll ever need :-) class Banana(protocol.Protocol, styles.Ephemeral): """ L{Banana} implements the I{Banana} s-expression protocol, client and server. @ivar knownDialects: These are the profiles supported by this Banana implementation. @type knownDialects: L{list} of L{bytes} """ # The specification calls these profiles but this implementation calls them # dialects instead. knownDialects = [b"pb", b"none"] prefixLimit = None sizeLimit = SIZE_LIMIT def setPrefixLimit(self, limit): """ Set the prefix limit for decoding done by this protocol instance. @see: L{setPrefixLimit} """ self.prefixLimit = limit self._smallestLongInt = -2 ** (limit * 7) + 1 self._smallestInt = -2 ** 31 self._largestInt = 2 ** 31 - 1 self._largestLongInt = 2 ** (limit * 7) - 1 def connectionReady(self): """Surrogate for connectionMade Called after protocol negotiation. """ def _selectDialect(self, dialect): self.currentDialect = dialect self.connectionReady() def callExpressionReceived(self, obj): if self.currentDialect: self.expressionReceived(obj) else: # this is the first message we've received if self.isClient: # if I'm a client I have to respond for serverVer in obj: if serverVer in self.knownDialects: self.sendEncoded(serverVer) self._selectDialect(serverVer) break else: # I can't speak any of those dialects. log.msg("The client doesn't speak any of the protocols " "offered by the server: disconnecting.") self.transport.loseConnection() else: if obj in self.knownDialects: self._selectDialect(obj) else: # the client just selected a protocol that I did not suggest. log.msg("The client selected a protocol the server didn't " "suggest and doesn't know: disconnecting.") self.transport.loseConnection() def connectionMade(self): self.setPrefixLimit(_PREFIX_LIMIT) self.currentDialect = None if not self.isClient: self.sendEncoded(self.knownDialects) def gotItem(self, item): l = self.listStack if l: l[-1][1].append(item) else: self.callExpressionReceived(item) buffer = b'' def dataReceived(self, chunk): buffer = self.buffer + chunk listStack = self.listStack gotItem = self.gotItem while buffer: assert self.buffer != buffer, "This ain't right: %s %s" % (repr(self.buffer), repr(buffer)) self.buffer = buffer pos = 0 for ch in iterbytes(buffer): if ch >= HIGH_BIT_SET: break pos = pos + 1 else: if pos > self.prefixLimit: raise BananaError("Security precaution: more than %d bytes of prefix" % (self.prefixLimit,)) return num = buffer[:pos] typebyte = buffer[pos:pos+1] rest = buffer[pos+1:] if len(num) > self.prefixLimit: raise BananaError("Security precaution: longer than %d bytes worth of prefix" % (self.prefixLimit,)) if typebyte == LIST: num = b1282int(num) if num > SIZE_LIMIT: raise BananaError("Security precaution: List too long.") listStack.append((num, [])) buffer = rest elif typebyte == STRING: num = b1282int(num) if num > SIZE_LIMIT: raise BananaError("Security precaution: String too long.") if len(rest) >= num: buffer = rest[num:] gotItem(rest[:num]) else: return elif typebyte == INT: buffer = rest num = b1282int(num) gotItem(num) elif typebyte == LONGINT: buffer = rest num = b1282int(num) gotItem(num) elif typebyte == LONGNEG: buffer = rest num = b1282int(num) gotItem(-num) elif typebyte == NEG: buffer = rest num = -b1282int(num) gotItem(num) elif typebyte == VOCAB: buffer = rest num = b1282int(num) item = self.incomingVocabulary[num] if self.currentDialect == b'pb': # the sender issues VOCAB only for dialect pb gotItem(item) else: raise NotImplementedError( "Invalid item for pb protocol {0!r}".format(item)) elif typebyte == FLOAT: if len(rest) >= 8: buffer = rest[8:] gotItem(struct.unpack("!d", rest[:8])[0]) else: return else: raise NotImplementedError(("Invalid Type Byte %r" % (typebyte,))) while listStack and (len(listStack[-1][1]) == listStack[-1][0]): item = listStack.pop()[1] gotItem(item) self.buffer = b'' def expressionReceived(self, lst): """Called when an expression (list, string, or int) is received. """ raise NotImplementedError() outgoingVocabulary = { # Jelly Data Types b'None' : 1, b'class' : 2, b'dereference' : 3, b'reference' : 4, b'dictionary' : 5, b'function' : 6, b'instance' : 7, b'list' : 8, b'module' : 9, b'persistent' : 10, b'tuple' : 11, b'unpersistable' : 12, # PB Data Types b'copy' : 13, b'cache' : 14, b'cached' : 15, b'remote' : 16, b'local' : 17, b'lcache' : 18, # PB Protocol Messages b'version' : 19, b'login' : 20, b'password' : 21, b'challenge' : 22, b'logged_in' : 23, b'not_logged_in' : 24, b'cachemessage' : 25, b'message' : 26, b'answer' : 27, b'error' : 28, b'decref' : 29, b'decache' : 30, b'uncache' : 31, } incomingVocabulary = {} for k, v in outgoingVocabulary.items(): incomingVocabulary[v] = k def __init__(self, isClient=1): self.listStack = [] self.outgoingSymbols = copy.copy(self.outgoingVocabulary) self.outgoingSymbolCount = 0 self.isClient = isClient def sendEncoded(self, obj): """ Send the encoded representation of the given object: @param obj: An object to encode and send. @raise BananaError: If the given object is not an instance of one of the types supported by Banana. @return: L{None} """ encodeStream = BytesIO() self._encode(obj, encodeStream.write) value = encodeStream.getvalue() self.transport.write(value) def _encode(self, obj, write): if isinstance(obj, (list, tuple)): if len(obj) > SIZE_LIMIT: raise BananaError( "list/tuple is too long to send (%d)" % (len(obj),)) int2b128(len(obj), write) write(LIST) for elem in obj: self._encode(elem, write) elif isinstance(obj, (int, long)): if obj < self._smallestLongInt or obj > self._largestLongInt: raise BananaError( "int/long is too large to send (%d)" % (obj,)) if obj < self._smallestInt: int2b128(-obj, write) write(LONGNEG) elif obj < 0: int2b128(-obj, write) write(NEG) elif obj <= self._largestInt: int2b128(obj, write) write(INT) else: int2b128(obj, write) write(LONGINT) elif isinstance(obj, float): write(FLOAT) write(struct.pack("!d", obj)) elif isinstance(obj, bytes): # TODO: an API for extending banana... if self.currentDialect == b"pb" and obj in self.outgoingSymbols: symbolID = self.outgoingSymbols[obj] int2b128(symbolID, write) write(VOCAB) else: if len(obj) > SIZE_LIMIT: raise BananaError( "byte string is too long to send (%d)" % (len(obj),)) int2b128(len(obj), write) write(STRING) write(obj) else: raise BananaError("Banana cannot send {0} objects: {1!r}".format( fullyQualifiedName(type(obj)), obj)) # For use from the interactive interpreter _i = Banana() _i.connectionMade() _i._selectDialect(b"none") def encode(lst): """Encode a list s-expression.""" encodeStream = BytesIO() _i.transport = encodeStream _i.sendEncoded(lst) return encodeStream.getvalue() def decode(st): """ Decode a banana-encoded string. """ l = [] _i.expressionReceived = l.append try: _i.dataReceived(st) finally: _i.buffer = b'' del _i.expressionReceived return l[0]