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import unittest
import dns.exception
import dns.wire
import dns.name
class BinaryTestCase(unittest.TestCase):
def test_basic(self):
wire = bytes.fromhex('0102010203040102')
p = dns.wire.Parser(wire)
self.assertEqual(p.get_uint16(), 0x0102)
with p.restrict_to(5):
self.assertEqual(p.get_uint32(), 0x01020304)
self.assertEqual(p.get_uint8(), 0x01)
self.assertEqual(p.remaining(), 0)
with self.assertRaises(dns.exception.FormError):
p.get_uint16()
self.assertEqual(p.remaining(), 1)
self.assertEqual(p.get_uint8(), 0x02)
with self.assertRaises(dns.exception.FormError):
p.get_uint8()
def test_name(self):
# www.dnspython.org NS IN question
wire = b'\x03www\x09dnspython\x03org\x00\x00\x02\x00\x01'
expected = dns.name.from_text('www.dnspython.org')
p = dns.wire.Parser(wire)
self.assertEqual(p.get_name(), expected)
self.assertEqual(p.get_uint16(), 2)
self.assertEqual(p.get_uint16(), 1)
self.assertEqual(p.remaining(), 0)
def test_relativized_name(self):
# www.dnspython.org NS IN question
wire = b'\x03www\x09dnspython\x03org\x00\x00\x02\x00\x01'
origin = dns.name.from_text('dnspython.org')
expected = dns.name.from_text('www', None)
p = dns.wire.Parser(wire)
self.assertEqual(p.get_name(origin), expected)
self.assertEqual(p.remaining(), 4)
def test_compressed_name(self):
# www.dnspython.org NS IN question
wire = b'\x09dnspython\x03org\x00\x03www\xc0\x00'
expected1 = dns.name.from_text('dnspython.org')
expected2 = dns.name.from_text('www.dnspython.org')
p = dns.wire.Parser(wire)
self.assertEqual(p.get_name(), expected1)
self.assertEqual(p.get_name(), expected2)
self.assertEqual(p.remaining(), 0)
# verify the restore_furthest()
self.assertEqual(p.current, len(wire))
def test_seek(self):
wire = b'\x09dnspython\x03org\x00'
p = dns.wire.Parser(wire)
p.seek(10)
self.assertEqual(p.get_uint8(), 3)
# seeking to the end index is OK
p.seek(len(wire))
self.assertEqual(p.current, p.end)
with self.assertRaises(dns.exception.FormError):
# but reading there will not succeed
p.get_uint8()
with self.assertRaises(dns.exception.FormError):
p.seek(-1)
with self.assertRaises(dns.exception.FormError):
p.seek(len(wire) + 1)
def test_not_reading_everything_in_restriction(self):
wire = bytes.fromhex('0102010203040102')
p = dns.wire.Parser(wire)
with self.assertRaises(dns.exception.FormError):
with p.restrict_to(5):
v = p.get_uint8()
self.assertEqual(v, 1)
# don't read the other 4 bytes
def test_restriction_does_not_mask_exception(self):
wire = bytes.fromhex('0102010203040102')
p = dns.wire.Parser(wire)
with self.assertRaises(NotImplementedError):
with p.restrict_to(5):
raise NotImplementedError
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