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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
from twisted.trial import unittest
from twisted.python import components
from twisted.pair import ethernet, raw
from zope.interface import implementer
@implementer(raw.IRawPacketProtocol)
class MyProtocol:
def __init__(self, expecting):
self.expecting = list(expecting)
def datagramReceived(self, data, **kw):
assert self.expecting, 'Got a packet when not expecting anymore.'
expect = self.expecting.pop(0)
assert expect == (data, kw), \
"Expected %r, got %r" % (
expect, (data, kw),
)
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' % p1.expecting
assert not p2.expecting, \
'Should not expect any more packets, but still want %r' % 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')