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Code Editor : test_ip.py
# Copyright (c) Twisted Matrix Laboratories. # See LICENSE for details. from zope import interface from twisted.pair import ip, raw from twisted.python import components from twisted.trial import unittest @interface.implementer(raw.IRawDatagramProtocol) class MyProtocol: def __init__(self, expecting): self.expecting = list(expecting) def datagramReceived( self, data, partial, source, dest, protocol, version, ihl, tos, tot_len, fragment_id, fragment_offset, dont_fragment, more_fragments, ttl, ): assert self.expecting, "Got a packet when not expecting anymore." expectData, expectKw = self.expecting.pop(0) expectKwKeys = expectKw.keys() expectKwKeys = list(sorted(expectKwKeys)) localVariables = locals() for k in expectKwKeys: assert ( expectKw[k] == localVariables[k] ), f"Expected {k}={expectKw[k]!r}, got {localVariables[k]!r}" assert expectData == data, f"Expected {expectData!r}, got {data!r}" def addProto(self, num, proto): # IRawDatagramProtocol.addProto pass class IPTests(unittest.TestCase): def testPacketParsing(self): proto = ip.IPProtocol() p1 = MyProtocol( [ ( b"foobar", { "partial": 0, "dest": "1.2.3.4", "source": "5.6.7.8", "protocol": 0x0F, "version": 4, "ihl": 20, "tos": 7, "tot_len": 20 + 6, "fragment_id": 0xDEAD, "fragment_offset": 0x1EEF, "dont_fragment": 0, "more_fragments": 1, "ttl": 0xC0, }, ), ] ) proto.addProto(0x0F, p1) proto.datagramReceived( b"\x54" # ihl version + b"\x07" # tos + b"\x00\x1a" # tot_len + b"\xDE\xAD" # id + b"\xBE\xEF" # frag_off + b"\xC0" # ttl + b"\x0F" # protocol + b"FE" # checksum + b"\x05\x06\x07\x08" + b"\x01\x02\x03\x04" + b"foobar", partial=0, dest="dummy", source="dummy", protocol="dummy", ) assert not p1.expecting, ( "Should not expect any more packets, but still want %r" % p1.expecting ) def testMultiplePackets(self): proto = ip.IPProtocol() p1 = MyProtocol( [ ( b"foobar", { "partial": 0, "dest": "1.2.3.4", "source": "5.6.7.8", "protocol": 0x0F, "version": 4, "ihl": 20, "tos": 7, "tot_len": 20 + 6, "fragment_id": 0xDEAD, "fragment_offset": 0x1EEF, "dont_fragment": 0, "more_fragments": 1, "ttl": 0xC0, }, ), ( b"quux", { "partial": 1, "dest": "5.4.3.2", "source": "6.7.8.9", "protocol": 0x0F, "version": 4, "ihl": 20, "tos": 7, "tot_len": 20 + 6, "fragment_id": 0xDEAD, "fragment_offset": 0x1EEF, "dont_fragment": 0, "more_fragments": 1, "ttl": 0xC0, }, ), ] ) proto.addProto(0x0F, p1) proto.datagramReceived( b"\x54" # ihl version + b"\x07" # tos + b"\x00\x1a" # tot_len + b"\xDE\xAD" # id + b"\xBE\xEF" # frag_off + b"\xC0" # ttl + b"\x0F" # protocol + b"FE" # checksum + b"\x05\x06\x07\x08" + b"\x01\x02\x03\x04" + b"foobar", partial=0, dest="dummy", source="dummy", protocol="dummy", ) proto.datagramReceived( b"\x54" # ihl version + b"\x07" # tos + b"\x00\x1a" # tot_len + b"\xDE\xAD" # id + b"\xBE\xEF" # frag_off + b"\xC0" # ttl + b"\x0F" # protocol + b"FE" # checksum + b"\x06\x07\x08\x09" + b"\x05\x04\x03\x02" + b"quux", partial=1, dest="dummy", source="dummy", protocol="dummy", ) assert not p1.expecting, ( "Should not expect any more packets, but still want %r" % p1.expecting ) def testMultipleSameProtos(self): proto = ip.IPProtocol() p1 = MyProtocol( [ ( b"foobar", { "partial": 0, "dest": "1.2.3.4", "source": "5.6.7.8", "protocol": 0x0F, "version": 4, "ihl": 20, "tos": 7, "tot_len": 20 + 6, "fragment_id": 0xDEAD, "fragment_offset": 0x1EEF, "dont_fragment": 0, "more_fragments": 1, "ttl": 0xC0, }, ), ] ) p2 = MyProtocol( [ ( b"foobar", { "partial": 0, "dest": "1.2.3.4", "source": "5.6.7.8", "protocol": 0x0F, "version": 4, "ihl": 20, "tos": 7, "tot_len": 20 + 6, "fragment_id": 0xDEAD, "fragment_offset": 0x1EEF, "dont_fragment": 0, "more_fragments": 1, "ttl": 0xC0, }, ), ] ) proto.addProto(0x0F, p1) proto.addProto(0x0F, p2) proto.datagramReceived( b"\x54" # ihl version + b"\x07" # tos + b"\x00\x1a" # tot_len + b"\xDE\xAD" # id + b"\xBE\xEF" # frag_off + b"\xC0" # ttl + b"\x0F" # protocol + b"FE" # checksum + b"\x05\x06\x07\x08" + b"\x01\x02\x03\x04" + b"foobar", partial=0, dest="dummy", source="dummy", protocol="dummy", ) assert not p1.expecting, ( "Should not expect any more packets, but still want %r" % p1.expecting ) assert not p2.expecting, ( "Should not expect any more packets, but still want %r" % p2.expecting ) def testWrongProtoNotSeen(self): proto = ip.IPProtocol() p1 = MyProtocol([]) proto.addProto(1, p1) proto.datagramReceived( b"\x54" # ihl version + b"\x07" # tos + b"\x00\x1a" # tot_len + b"\xDE\xAD" # id + b"\xBE\xEF" # frag_off + b"\xC0" # ttl + b"\x0F" # protocol + b"FE" # checksum + b"\x05\x06\x07\x08" + b"\x01\x02\x03\x04" + b"foobar", partial=0, dest="dummy", source="dummy", protocol="dummy", ) def testDemuxing(self): proto = ip.IPProtocol() p1 = MyProtocol( [ ( b"foobar", { "partial": 0, "dest": "1.2.3.4", "source": "5.6.7.8", "protocol": 0x0F, "version": 4, "ihl": 20, "tos": 7, "tot_len": 20 + 6, "fragment_id": 0xDEAD, "fragment_offset": 0x1EEF, "dont_fragment": 0, "more_fragments": 1, "ttl": 0xC0, }, ), ( b"quux", { "partial": 1, "dest": "5.4.3.2", "source": "6.7.8.9", "protocol": 0x0F, "version": 4, "ihl": 20, "tos": 7, "tot_len": 20 + 6, "fragment_id": 0xDEAD, "fragment_offset": 0x1EEF, "dont_fragment": 0, "more_fragments": 1, "ttl": 0xC0, }, ), ] ) proto.addProto(0x0F, p1) p2 = MyProtocol( [ ( b"quux", { "partial": 1, "dest": "5.4.3.2", "source": "6.7.8.9", "protocol": 0x0A, "version": 4, "ihl": 20, "tos": 7, "tot_len": 20 + 6, "fragment_id": 0xDEAD, "fragment_offset": 0x1EEF, "dont_fragment": 0, "more_fragments": 1, "ttl": 0xC0, }, ), ( b"foobar", { "partial": 0, "dest": "1.2.3.4", "source": "5.6.7.8", "protocol": 0x0A, "version": 4, "ihl": 20, "tos": 7, "tot_len": 20 + 6, "fragment_id": 0xDEAD, "fragment_offset": 0x1EEF, "dont_fragment": 0, "more_fragments": 1, "ttl": 0xC0, }, ), ] ) proto.addProto(0x0A, p2) proto.datagramReceived( b"\x54" # ihl version + b"\x07" # tos + b"\x00\x1a" # tot_len + b"\xDE\xAD" # id + b"\xBE\xEF" # frag_off + b"\xC0" # ttl + b"\x0A" # protocol + b"FE" # checksum + b"\x06\x07\x08\x09" + b"\x05\x04\x03\x02" + b"quux", partial=1, dest="dummy", source="dummy", protocol="dummy", ) proto.datagramReceived( b"\x54" # ihl version + b"\x07" # tos + b"\x00\x1a" # tot_len + b"\xDE\xAD" # id + b"\xBE\xEF" # frag_off + b"\xC0" # ttl + b"\x0F" # protocol + b"FE" # checksum + b"\x05\x06\x07\x08" + b"\x01\x02\x03\x04" + b"foobar", partial=0, dest="dummy", source="dummy", protocol="dummy", ) proto.datagramReceived( b"\x54" # ihl version + b"\x07" # tos + b"\x00\x1a" # tot_len + b"\xDE\xAD" # id + b"\xBE\xEF" # frag_off + b"\xC0" # ttl + b"\x0F" # protocol + b"FE" # checksum + b"\x06\x07\x08\x09" + b"\x05\x04\x03\x02" + b"quux", partial=1, dest="dummy", source="dummy", protocol="dummy", ) proto.datagramReceived( b"\x54" # ihl version + b"\x07" # tos + b"\x00\x1a" # tot_len + b"\xDE\xAD" # id + b"\xBE\xEF" # frag_off + b"\xC0" # ttl + b"\x0A" # protocol + b"FE" # checksum + b"\x05\x06\x07\x08" + b"\x01\x02\x03\x04" + b"foobar", partial=0, dest="dummy", source="dummy", protocol="dummy", ) assert not p1.expecting, ( "Should not expect any more packets, but still want %r" % p1.expecting ) assert not p2.expecting, ( "Should not expect any more packets, but still want %r" % p2.expecting ) def testAddingBadProtos_WrongLevel(self): """Adding a wrong level protocol raises an exception.""" e = ip.IPProtocol() try: e.addProto(42, "silliness") except components.CannotAdapt: pass else: raise AssertionError("addProto must raise an exception for bad protocols") def testAddingBadProtos_TooSmall(self): """Adding a protocol with a negative number raises an exception.""" e = ip.IPProtocol() try: e.addProto(-1, MyProtocol([])) except TypeError as e: if e.args == ("Added protocol must be positive or zero",): pass else: raise else: raise AssertionError("addProto must raise an exception for bad protocols") def testAddingBadProtos_TooBig(self): """Adding a protocol with a number >=2**32 raises an exception.""" e = ip.IPProtocol() try: e.addProto(2 ** 32, MyProtocol([])) except TypeError as e: if e.args == ("Added protocol must fit in 32 bits",): pass else: raise else: raise AssertionError("addProto must raise an exception for bad protocols") def testAddingBadProtos_TooBig2(self): """Adding a protocol with a number >=2**32 raises an exception.""" e = ip.IPProtocol() try: e.addProto(2 ** 32 + 1, MyProtocol([])) except TypeError as e: if e.args == ("Added protocol must fit in 32 bits",): pass else: raise else: raise AssertionError("addProto must raise an exception for bad protocols")
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