def server():
io = SansIORW(encoding="utf-8")
version, command, port, ipv4 = yield from io.read_struct("BBH4s")
assert version == 4
assert command == 1
assert port == 123
assert ipv4 == b"\x00\x00\x00\xff"
user_id = yield from io.read_c_string()
assert user_id == ""
host = yield from io.read_c_string()
assert host == "python.org"
yield from io.connect(host, port)
yield from io.write_struct("BBH4s", 0, 0x5a, 0, b"\x00" * 4)
yield from io.passthrough()
def server():
io = SansIORW(encoding="utf-8")
version, command, port, ipv4 = yield from io.read_struct("BBH4s")
assert version == 4
assert command == 1
assert port == 123
assert ipv4 == b"\x7f\x00\x00\x01"
user_id = yield from io.read_c_string()
assert user_id == "yoba"
yield from io.connect(ipv4, port)
yield from io.write_struct("BBH4s", 0, 0x5a, 666, b"\x00" * 4)
yield from io.passthrough()