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test_repairer: add a deterministic test of share data corruption that always flips the bits of the last byte of the share data. refs #1395

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This commit is contained in:
david-sarah 2011-08-02 10:58:41 -07:00
parent f426e82287
commit 9f8d34e63a
2 changed files with 21 additions and 0 deletions
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16
src/allmydata/test/common.py
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@ -1200,6 +1200,22 @@ def _corrupt_share_data(data, debug=False):
return corrupt_field(data, 0x0c+0x44, sharedatasize)
def _corrupt_share_data_last_byte(data, debug=False):
"""Scramble the file data -- flip all bits of the last byte."""
sharevernum = struct.unpack(">L", data[0x0c:0x0c+4])[0]
assert sharevernum in (1, 2), "This test is designed to corrupt immutable shares of v1 or v2 in specific ways, not v%d." % sharevernum
if sharevernum == 1:
sharedatasize = struct.unpack(">L", data[0x0c+0x08:0x0c+0x08+4])[0]
offset = 0x0c+0x24+sharedatasize-1
else:
sharedatasize = struct.unpack(">Q", data[0x0c+0x08:0x0c+0x0c+8])[0]
offset = 0x0c+0x44+sharedatasize-1
newdata = data[:offset] + chr(ord(data[offset])^0xFF) + data[offset+1:]
if debug:
log.msg("testing: flipping all bits of byte at offset %d: %r, newdata: %r" % (offset, data[offset], newdata[offset]))
return newdata
def _corrupt_crypttext_hash_tree(data, debug=False):
"""Scramble the file data -- the field containing the crypttext hash tree
will have one bit flipped or else will be changed to a random value.

5
src/allmydata/test/test_repairer.py
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@ -239,6 +239,11 @@ class Verifier(GridTestMixin, unittest.TestCase, RepairTestMixin):
return self._help_test_verify(common._corrupt_share_data,
self.judge_invisible_corruption)
def test_corrupt_sharedata_last_byte(self):
self.basedir = "repairer/Verifier/corrupt_sharedata_last_byte"
return self._help_test_verify(common._corrupt_share_data_last_byte,
self.judge_invisible_corruption)
def test_corrupt_ueb_length(self):
self.basedir = "repairer/Verifier/corrupt_ueb_length"
return self._help_test_verify(common._corrupt_length_of_uri_extension,