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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
from zope.interface import implementer
from twisted.pair import ethernet, raw
from twisted.python import components
from twisted.trial import unittest
@implementer(raw.IRawPacketProtocol)
class MyProtocol:
def __init__(self, expecting):
self.expecting = list(expecting)
def addProto(self, num, proto):
"""
Not implemented
"""
def datagramReceived(self, data, partial, dest, source, protocol):
assert self.expecting, "Got a packet when not expecting anymore."
expect = self.expecting.pop(0)
localVariables = locals()
params = {
"partial": partial,
"dest": dest,
"source": source,
"protocol": protocol,
}
assert expect == (data, params), "Expected {!r}, got {!r}".format(
expect, (data, params)
)
class EthernetTests(unittest.TestCase):
def testPacketParsing(self):
proto = ethernet.EthernetProtocol()
p1 = MyProtocol(
[
(
b"foobar",
{
"partial": 0,
"dest": b"123456",
"source": b"987654",
"protocol": 0x0800,
},
),
]
)
proto.addProto(0x0800, p1)
proto.datagramReceived(b"123456987654\x08\x00foobar", partial=0)
assert not p1.expecting, (
"Should not expect any more packets, but still want %r" % p1.expecting
)
def testMultiplePackets(self):
proto = ethernet.EthernetProtocol()
p1 = MyProtocol(
[
(
b"foobar",
{
"partial": 0,
"dest": b"123456",
"source": b"987654",
"protocol": 0x0800,
},
),
(
b"quux",
{
"partial": 1,
"dest": b"012345",
"source": b"abcdef",
"protocol": 0x0800,
},
),
]
)
proto.addProto(0x0800, p1)
proto.datagramReceived(b"123456987654\x08\x00foobar", partial=0)
proto.datagramReceived(b"012345abcdef\x08\x00quux", partial=1)
assert not p1.expecting, (
"Should not expect any more packets, but still want %r" % p1.expecting
)
def testMultipleSameProtos(self):
proto = ethernet.EthernetProtocol()
p1 = MyProtocol(
[
(
b"foobar",
{
"partial": 0,
"dest": b"123456",
"source": b"987654",
"protocol": 0x0800,
},
),
]
)
p2 = MyProtocol(
[
(
b"foobar",
{
"partial": 0,
"dest": b"123456",
"source": b"987654",
"protocol": 0x0800,
},
),
]
)
proto.addProto(0x0800, p1)
proto.addProto(0x0800, p2)
proto.datagramReceived(b"123456987654\x08\x00foobar", partial=0)
assert (
not p1.expecting
), "Should not expect any more packets, " "but still want {!r}".format(
p1.expecting
)
assert (
not p2.expecting
), "Should not expect any more packets," " but still want {!r}".format(
p2.expecting
)
def testWrongProtoNotSeen(self):
proto = ethernet.EthernetProtocol()
p1 = MyProtocol([])
proto.addProto(0x0801, p1)
proto.datagramReceived(b"123456987654\x08\x00foobar", partial=0)
proto.datagramReceived(b"012345abcdef\x08\x00quux", partial=1)
def testDemuxing(self):
proto = ethernet.EthernetProtocol()
p1 = MyProtocol(
[
(
b"foobar",
{
"partial": 0,
"dest": b"123456",
"source": b"987654",
"protocol": 0x0800,
},
),
(
b"quux",
{
"partial": 1,
"dest": b"012345",
"source": b"abcdef",
"protocol": 0x0800,
},
),
]
)
proto.addProto(0x0800, p1)
p2 = MyProtocol(
[
(
b"quux",
{
"partial": 1,
"dest": b"012345",
"source": b"abcdef",
"protocol": 0x0806,
},
),
(
b"foobar",
{
"partial": 0,
"dest": b"123456",
"source": b"987654",
"protocol": 0x0806,
},
),
]
)
proto.addProto(0x0806, p2)
proto.datagramReceived(b"123456987654\x08\x00foobar", partial=0)
proto.datagramReceived(b"012345abcdef\x08\x06quux", partial=1)
proto.datagramReceived(b"123456987654\x08\x06foobar", partial=0)
proto.datagramReceived(b"012345abcdef\x08\x00quux", partial=1)
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 = ethernet.EthernetProtocol()
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 = ethernet.EthernetProtocol()
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**16 raises an exception."""
e = ethernet.EthernetProtocol()
try:
e.addProto(2**16, MyProtocol([]))
except TypeError as e:
if e.args == ("Added protocol must fit in 16 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**16 raises an exception."""
e = ethernet.EthernetProtocol()
try:
e.addProto(2**16 + 1, MyProtocol([]))
except TypeError as e:
if e.args == ("Added protocol must fit in 16 bits",):
pass
else:
raise
else:
raise AssertionError("addProto must raise an exception for bad protocols")
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