def test_from_bytes_selftest(self, subject):
"""Test if it can parse its own output"""
p = self.saturated_packet()
p2 = Ipv4RawPacket.from_bytes(bytes(p))
msg = "Packets are not equal:\n\np1:\n{}\np2:\n{}".format(
p.diagram(with_lines=True, with_captions=True),
p2.diagram(with_lines=True)
)
assert p2 == p, msg
def example_packet(self):
"""Returns the example packet from this Wikipedia entry:
https://en.wikipedia.org/wiki/IPv4_header_checksum
"""
packet_hex = [
# Header
"45", "00", "00", "73", "00", "00", "40", "00", "40", "11",
"b8", "61", "c0", "a8", "00", "01", "c0", "a8", "00", "c7",
# Payload
"00", "35", "e9", "7c", "00", "5f", "27", "9f", "1e", "4b",
"81", "80"
]
packet_bytes = bytes(int(x, 16) for x in packet_hex)
return Ipv4RawPacket.from_bytes(packet_bytes)