RAHHH
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# Copyright (c) Twisted Matrix Laboratories.
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# See LICENSE for details.
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from __future__ import annotations
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from twisted.internet import protocol
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from twisted.pair import rawudp
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#
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from twisted.trial import unittest
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class MyProtocol(protocol.DatagramProtocol):
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def __init__(self, expecting: list[tuple[bytes, bytes, int]]) -> None:
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self.expecting = list(expecting)
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def datagramReceived(self, data: bytes, peer: tuple[bytes, int]) -> None:
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(host, port) = peer
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assert self.expecting, "Got a packet when not expecting anymore."
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expectData, expectHost, expectPort = self.expecting.pop(0)
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assert expectData == data, "Expected data {!r}, got {!r}".format(
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expectData, data
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)
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assert expectHost == host, "Expected host {!r}, got {!r}".format(
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expectHost, host
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)
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assert expectPort == port, "Expected port %d=0x%04x, got %d=0x%04x" % (
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expectPort,
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expectPort,
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port,
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port,
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)
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class RawUDPTests(unittest.TestCase):
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def testPacketParsing(self) -> None:
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proto = rawudp.RawUDPProtocol()
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p1 = MyProtocol(
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[
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(b"foobar", b"testHost", 0x43A2),
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]
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)
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proto.addProto(0xF00F, p1)
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proto.datagramReceived(
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b"\x43\xA2" # source
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b"\xf0\x0f" # dest
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b"\x00\x06" # len
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b"\xDE\xAD" # check
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b"foobar",
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partial=0,
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dest=b"dummy",
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source=b"testHost",
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protocol=b"dummy",
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version=b"dummy",
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ihl=b"dummy",
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tos=b"dummy",
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tot_len=b"dummy",
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fragment_id=b"dummy",
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fragment_offset=b"dummy",
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dont_fragment=b"dummy",
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more_fragments=b"dummy",
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ttl=b"dummy",
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)
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assert not p1.expecting, (
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"Should not expect any more packets, but still want %r" % p1.expecting
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)
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def testMultiplePackets(self) -> None:
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proto = rawudp.RawUDPProtocol()
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p1 = MyProtocol(
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[
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(b"foobar", b"testHost", 0x43A2),
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(b"quux", b"otherHost", 0x33FE),
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]
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)
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proto.addProto(0xF00F, p1)
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proto.datagramReceived(
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b"\x43\xA2" # source
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b"\xf0\x0f" # dest
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b"\x00\x06" # len
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b"\xDE\xAD" # check
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b"foobar",
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partial=0,
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dest=b"dummy",
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source=b"testHost",
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protocol=b"dummy",
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version=b"dummy",
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ihl=b"dummy",
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tos=b"dummy",
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tot_len=b"dummy",
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fragment_id=b"dummy",
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fragment_offset=b"dummy",
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dont_fragment=b"dummy",
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more_fragments=b"dummy",
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ttl=b"dummy",
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)
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proto.datagramReceived(
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b"\x33\xFE" # source
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b"\xf0\x0f" # dest
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b"\x00\x05" # len
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b"\xDE\xAD" # check
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b"quux",
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partial=0,
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dest=b"dummy",
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source=b"otherHost",
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protocol=b"dummy",
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version=b"dummy",
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ihl=b"dummy",
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tos=b"dummy",
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tot_len=b"dummy",
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fragment_id=b"dummy",
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fragment_offset=b"dummy",
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dont_fragment=b"dummy",
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more_fragments=b"dummy",
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ttl=b"dummy",
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)
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assert not p1.expecting, (
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"Should not expect any more packets, but still want %r" % p1.expecting
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)
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def testMultipleSameProtos(self) -> None:
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proto = rawudp.RawUDPProtocol()
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p1 = MyProtocol(
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[
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(b"foobar", b"testHost", 0x43A2),
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]
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)
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p2 = MyProtocol(
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[
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(b"foobar", b"testHost", 0x43A2),
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]
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)
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proto.addProto(0xF00F, p1)
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proto.addProto(0xF00F, p2)
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proto.datagramReceived(
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b"\x43\xA2" # source
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b"\xf0\x0f" # dest
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b"\x00\x06" # len
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b"\xDE\xAD" # check
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b"foobar",
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partial=0,
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dest=b"dummy",
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source=b"testHost",
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protocol=b"dummy",
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version=b"dummy",
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ihl=b"dummy",
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tos=b"dummy",
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tot_len=b"dummy",
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fragment_id=b"dummy",
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fragment_offset=b"dummy",
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dont_fragment=b"dummy",
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more_fragments=b"dummy",
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ttl=b"dummy",
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)
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assert not p1.expecting, (
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"Should not expect any more packets, but still want %r" % p1.expecting
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)
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assert not p2.expecting, (
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"Should not expect any more packets, but still want %r" % p2.expecting
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)
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def testWrongProtoNotSeen(self) -> None:
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proto = rawudp.RawUDPProtocol()
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p1 = MyProtocol([])
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proto.addProto(1, p1)
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proto.datagramReceived(
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b"\x43\xA2" # source
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b"\xf0\x0f" # dest
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b"\x00\x06" # len
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b"\xDE\xAD" # check
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b"foobar",
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partial=0,
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dest=b"dummy",
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source=b"testHost",
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protocol=b"dummy",
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version=b"dummy",
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ihl=b"dummy",
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tos=b"dummy",
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tot_len=b"dummy",
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fragment_id=b"dummy",
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fragment_offset=b"dummy",
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dont_fragment=b"dummy",
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more_fragments=b"dummy",
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ttl=b"dummy",
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)
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def testDemuxing(self) -> None:
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proto = rawudp.RawUDPProtocol()
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p1 = MyProtocol(
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[
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(b"foobar", b"testHost", 0x43A2),
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(b"quux", b"otherHost", 0x33FE),
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]
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)
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proto.addProto(0xF00F, p1)
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p2 = MyProtocol(
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[
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(b"quux", b"otherHost", 0xA401),
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(b"foobar", b"testHost", 0xA302),
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]
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)
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proto.addProto(0xB050, p2)
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proto.datagramReceived(
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b"\xA4\x01" # source
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b"\xB0\x50" # dest
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b"\x00\x05" # len
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b"\xDE\xAD" # check
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b"quux",
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partial=0,
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dest=b"dummy",
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source=b"otherHost",
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protocol=b"dummy",
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version=b"dummy",
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ihl=b"dummy",
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tos=b"dummy",
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tot_len=b"dummy",
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fragment_id=b"dummy",
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fragment_offset=b"dummy",
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dont_fragment=b"dummy",
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more_fragments=b"dummy",
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ttl=b"dummy",
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)
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proto.datagramReceived(
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b"\x43\xA2" # source
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b"\xf0\x0f" # dest
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b"\x00\x06" # len
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b"\xDE\xAD" # check
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b"foobar",
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partial=0,
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dest=b"dummy",
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source=b"testHost",
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protocol=b"dummy",
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version=b"dummy",
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ihl=b"dummy",
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tos=b"dummy",
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tot_len=b"dummy",
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fragment_id=b"dummy",
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fragment_offset=b"dummy",
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dont_fragment=b"dummy",
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more_fragments=b"dummy",
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ttl=b"dummy",
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)
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proto.datagramReceived(
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b"\x33\xFE" # source
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b"\xf0\x0f" # dest
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b"\x00\x05" # len
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b"\xDE\xAD" # check
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b"quux",
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partial=0,
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dest=b"dummy",
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source=b"otherHost",
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protocol=b"dummy",
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version=b"dummy",
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ihl=b"dummy",
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tos=b"dummy",
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tot_len=b"dummy",
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fragment_id=b"dummy",
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fragment_offset=b"dummy",
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dont_fragment=b"dummy",
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more_fragments=b"dummy",
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ttl=b"dummy",
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)
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proto.datagramReceived(
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b"\xA3\x02" # source
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b"\xB0\x50" # dest
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b"\x00\x06" # len
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b"\xDE\xAD" # check
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b"foobar",
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partial=0,
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dest=b"dummy",
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source=b"testHost",
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protocol=b"dummy",
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version=b"dummy",
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ihl=b"dummy",
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tos=b"dummy",
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tot_len=b"dummy",
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fragment_id=b"dummy",
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fragment_offset=b"dummy",
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dont_fragment=b"dummy",
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more_fragments=b"dummy",
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ttl=b"dummy",
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)
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assert not p1.expecting, (
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"Should not expect any more packets, but still want %r" % p1.expecting
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)
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assert not p2.expecting, (
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"Should not expect any more packets, but still want %r" % p2.expecting
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)
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def testAddingBadProtos_WrongLevel(self) -> None:
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"""Adding a wrong level protocol raises an exception."""
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e = rawudp.RawUDPProtocol()
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try:
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e.addProto(42, "silliness")
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except TypeError as e:
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if e.args == ("Added protocol must be an instance of DatagramProtocol",):
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pass
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else:
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raise
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else:
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raise AssertionError("addProto must raise an exception for bad protocols")
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def testAddingBadProtos_TooSmall(self) -> None:
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"""Adding a protocol with a negative number raises an exception."""
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e = rawudp.RawUDPProtocol()
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try:
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e.addProto(-1, protocol.DatagramProtocol())
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except TypeError as e:
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if e.args == ("Added protocol must be positive or zero",):
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pass
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else:
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raise
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else:
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raise AssertionError("addProto must raise an exception for bad protocols")
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def testAddingBadProtos_TooBig(self) -> None:
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"""Adding a protocol with a number >=2**16 raises an exception."""
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e = rawudp.RawUDPProtocol()
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try:
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e.addProto(2**16, protocol.DatagramProtocol())
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except TypeError as e:
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if e.args == ("Added protocol must fit in 16 bits",):
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pass
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else:
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raise
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else:
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raise AssertionError("addProto must raise an exception for bad protocols")
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def testAddingBadProtos_TooBig2(self) -> None:
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"""Adding a protocol with a number >=2**16 raises an exception."""
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e = rawudp.RawUDPProtocol()
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try:
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e.addProto(2**16 + 1, protocol.DatagramProtocol())
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except TypeError as e:
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if e.args == ("Added protocol must fit in 16 bits",):
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pass
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else:
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raise
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else:
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raise AssertionError("addProto must raise an exception for bad protocols")
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