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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
from __future__ import annotations
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: list[tuple[bytes, dict[str, str | int]]]) -> None:
self.expecting = list(expecting)
def datagramReceived(
self,
data: bytes,
partial: int,
source: str,
dest: str,
protocol: int,
version: int,
ihl: int,
tos: int,
tot_len: int,
fragment_id: int,
fragment_offset: int,
dont_fragment: int,
more_fragments: int,
ttl: int,
) -> None:
assert self.expecting, "Got a packet when not expecting anymore."
expectData, expectKw = self.expecting.pop(0)
expectKwKeys = list(sorted(expectKw.keys()))
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: object, proto: object) -> None:
# IRawDatagramProtocol.addProto
pass
class IPTests(unittest.TestCase):
def testPacketParsing(self) -> None:
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) -> None:
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) -> None:
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) -> None:
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) -> None:
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) -> None:
"""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) -> None:
"""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) -> None:
"""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) -> None:
"""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")