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# -*- test-case-name: twisted.pair.test.test_ip -*- # Copyright (c) Twisted Matrix Laboratories. # See LICENSE for details. # """Support for working directly with IP packets""" import socket import struct from zope.interface import implementer from twisted.internet import protocol from twisted.pair import raw class IPHeader: def __init__(self, data): ( ihlversion, self.tos, self.tot_len, self.fragment_id, frag_off, self.ttl, self.protocol, self.check, saddr, daddr, ) = struct.unpack("!BBHHHBBH4s4s", data[:20]) self.saddr = socket.inet_ntoa(saddr) self.daddr = socket.inet_ntoa(daddr) self.version = ihlversion & 0x0F self.ihl = ((ihlversion & 0xF0) >> 4) << 2 self.fragment_offset = frag_off & 0x1FFF self.dont_fragment = frag_off & 0x4000 != 0 self.more_fragments = frag_off & 0x2000 != 0 MAX_SIZE = 2 ** 32 @implementer(raw.IRawPacketProtocol) class IPProtocol(protocol.AbstractDatagramProtocol): def __init__(self): self.ipProtos = {} def addProto(self, num, proto): proto = raw.IRawDatagramProtocol(proto) if num < 0: raise TypeError("Added protocol must be positive or zero") if num >= MAX_SIZE: raise TypeError("Added protocol must fit in 32 bits") if num not in self.ipProtos: self.ipProtos[num] = [] self.ipProtos[num].append(proto) def datagramReceived(self, data, partial, dest, source, protocol): header = IPHeader(data) for proto in self.ipProtos.get(header.protocol, ()): proto.datagramReceived( data=data[20:], partial=partial, source=header.saddr, dest=header.daddr, protocol=header.protocol, version=header.version, ihl=header.ihl, tos=header.tos, tot_len=header.tot_len, fragment_id=header.fragment_id, fragment_offset=header.fragment_offset, dont_fragment=header.dont_fragment, more_fragments=header.more_fragments, ttl=header.ttl, )