From: Zooko O'Whielacronx Date: Sun, 10 Jan 2010 01:36:19 +0000 (-0800) Subject: repairer: add deterministic test for #819, mark as TODO X-Git-Tag: trac-4200~47 X-Git-Url: https://git.rkrishnan.org/Site/Content/Exhibitors/install-details.html?a=commitdiff_plain;h=876c4a153b53b08c5d11b7305497b6bfa2b47f8c;p=tahoe-lafs%2Ftahoe-lafs.git repairer: add deterministic test for #819, mark as TODO --- diff --git a/src/allmydata/test/common.py b/src/allmydata/test/common.py index ef2f6795..fc29f067 100644 --- a/src/allmydata/test/common.py +++ b/src/allmydata/test/common.py @@ -1140,21 +1140,21 @@ def corrupt_field(data, offset, size, debug=False): log.msg("testing: corrupting offset %d, size %d randomizing field, orig: %r, newval: %r" % (offset, size, data[offset:offset+size], newval)) return data[:offset]+newval+data[offset+size:] -def _corrupt_nothing(data): +def _corrupt_nothing(data, debug=False): """Leave the data pristine. """ return data -def _corrupt_file_version_number(data): +def _corrupt_file_version_number(data, debug=False): """Scramble the file data -- the share file version number have one bit flipped or else will be changed to a random value.""" return corrupt_field(data, 0x00, 4) -def _corrupt_size_of_file_data(data): +def _corrupt_size_of_file_data(data, debug=False): """Scramble the file data -- the field showing the size of the share data within the file will be set to one smaller.""" return corrupt_field(data, 0x04, 4) -def _corrupt_sharedata_version_number(data): +def _corrupt_sharedata_version_number(data, debug=False): """Scramble the file data -- the share data version number will have one bit flipped or else will be changed to a random value, but not 1 or 2.""" return corrupt_field(data, 0x0c, 4) @@ -1166,7 +1166,7 @@ def _corrupt_sharedata_version_number(data): newsharevernumbytes = struct.pack(">L", newsharevernum) return data[:0x0c] + newsharevernumbytes + data[0x0c+4:] -def _corrupt_sharedata_version_number_to_plausible_version(data): +def _corrupt_sharedata_version_number_to_plausible_version(data, debug=False): """Scramble the file data -- the share data version number will be changed to 2 if it is 1 or else to 1 if it is 2.""" sharevernum = struct.unpack(">L", data[0x0c:0x0c+4])[0] @@ -1178,7 +1178,7 @@ def _corrupt_sharedata_version_number_to_plausible_version(data): newsharevernumbytes = struct.pack(">L", newsharevernum) return data[:0x0c] + newsharevernumbytes + data[0x0c+4:] -def _corrupt_segment_size(data): +def _corrupt_segment_size(data, debug=False): """Scramble the file data -- the field showing the size of the segment will have one bit flipped or else be changed to a random value.""" sharevernum = struct.unpack(">L", data[0x0c:0x0c+4])[0] @@ -1188,7 +1188,7 @@ def _corrupt_segment_size(data): else: return corrupt_field(data, 0x0c+0x04, 8, debug=False) -def _corrupt_size_of_sharedata(data): +def _corrupt_size_of_sharedata(data, debug=False): """Scramble the file data -- the field showing the size of the data within the share data will have one bit flipped or else will be changed to a random value.""" @@ -1199,7 +1199,7 @@ def _corrupt_size_of_sharedata(data): else: return corrupt_field(data, 0x0c+0x0c, 8) -def _corrupt_offset_of_sharedata(data): +def _corrupt_offset_of_sharedata(data, debug=False): """Scramble the file data -- the field showing the offset of the data within the share data will have one bit flipped or else be changed to a random value.""" @@ -1210,7 +1210,7 @@ def _corrupt_offset_of_sharedata(data): else: return corrupt_field(data, 0x0c+0x14, 8) -def _corrupt_offset_of_ciphertext_hash_tree(data): +def _corrupt_offset_of_ciphertext_hash_tree(data, debug=False): """Scramble the file data -- the field showing the offset of the ciphertext hash tree within the share data will have one bit flipped or else be changed to a random value. @@ -1222,7 +1222,7 @@ def _corrupt_offset_of_ciphertext_hash_tree(data): else: return corrupt_field(data, 0x0c+0x24, 8, debug=False) -def _corrupt_offset_of_block_hashes(data): +def _corrupt_offset_of_block_hashes(data, debug=False): """Scramble the file data -- the field showing the offset of the block hash tree within the share data will have one bit flipped or else will be changed to a random value.""" @@ -1233,7 +1233,7 @@ def _corrupt_offset_of_block_hashes(data): else: return corrupt_field(data, 0x0c+0x2c, 8) -def _corrupt_offset_of_block_hashes_to_truncate_crypttext_hashes(data): +def _corrupt_offset_of_block_hashes_to_truncate_crypttext_hashes(data, debug=False): """Scramble the file data -- the field showing the offset of the block hash tree within the share data will have a multiple of hash size subtracted from it, thus causing the downloader to download an incomplete @@ -1251,7 +1251,7 @@ def _corrupt_offset_of_block_hashes_to_truncate_crypttext_hashes(data): newvalstr = struct.pack(">Q", newval) return data[:0x0c+0x2c]+newvalstr+data[0x0c+0x2c+8:] -def _corrupt_offset_of_share_hashes(data): +def _corrupt_offset_of_share_hashes(data, debug=False): """Scramble the file data -- the field showing the offset of the share hash tree within the share data will have one bit flipped or else will be changed to a random value.""" @@ -1262,7 +1262,7 @@ def _corrupt_offset_of_share_hashes(data): else: return corrupt_field(data, 0x0c+0x34, 8) -def _corrupt_offset_of_uri_extension(data): +def _corrupt_offset_of_uri_extension(data, debug=False): """Scramble the file data -- the field showing the offset of the uri extension will have one bit flipped or else will be changed to a random value.""" @@ -1292,7 +1292,7 @@ def _corrupt_offset_of_uri_extension_to_force_short_read(data, debug=False): log.msg("testing: corrupting offset %d, size %d, changing %d to %d (len(data) == %d)" % (0x48, 8, struct.unpack(">Q", data[0x48:0x48+8])[0], len(data)-0x0c-3, len(data))) return data[:0x48] + struct.pack(">Q", len(data)-0x0c-3) + data[0x48+8:] -def _corrupt_mutable_share_data(data): +def _corrupt_mutable_share_data(data, debug=False): prefix = data[:32] assert prefix == MutableShareFile.MAGIC, "This function is designed to corrupt mutable shares of v1, and the magic number doesn't look right: %r vs %r" % (prefix, MutableShareFile.MAGIC) data_offset = MutableShareFile.DATA_OFFSET @@ -1305,7 +1305,7 @@ def _corrupt_mutable_share_data(data): length = data_offset + offsets["enc_privkey"] - start return corrupt_field(data, start, length) -def _corrupt_share_data(data): +def _corrupt_share_data(data, debug=False): """Scramble the file data -- the field containing the share data itself will have one bit flipped or else will be changed to a random value.""" sharevernum = struct.unpack(">L", data[0x0c:0x0c+4])[0] @@ -1319,7 +1319,7 @@ def _corrupt_share_data(data): return corrupt_field(data, 0x0c+0x44, sharedatasize) -def _corrupt_crypttext_hash_tree(data): +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. """ @@ -1332,9 +1332,26 @@ def _corrupt_crypttext_hash_tree(data): crypttexthashtreeoffset = struct.unpack(">Q", data[0x0c+0x24:0x0c+0x24+8])[0] blockhashesoffset = struct.unpack(">Q", data[0x0c+0x2c:0x0c+0x2c+8])[0] - return corrupt_field(data, crypttexthashtreeoffset, blockhashesoffset-crypttexthashtreeoffset) + return corrupt_field(data, crypttexthashtreeoffset, blockhashesoffset-crypttexthashtreeoffset, debug=debug) -def _corrupt_block_hashes(data): +def _corrupt_crypttext_hash_tree_byte_9_bit_7(data, debug=False): + """Scramble the file data -- the field containing the crypttext hash tree + will have the 7th bit of the 9th byte flipped. + """ + 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." + if sharevernum == 1: + crypttexthashtreeoffset = struct.unpack(">L", data[0x0c+0x14:0x0c+0x14+4])[0] + blockhashesoffset = struct.unpack(">L", data[0x0c+0x18:0x0c+0x18+4])[0] + else: + crypttexthashtreeoffset = struct.unpack(">Q", data[0x0c+0x24:0x0c+0x24+8])[0] + blockhashesoffset = struct.unpack(">Q", data[0x0c+0x2c:0x0c+0x2c+8])[0] + + if debug: + log.msg("original data: %r" % (data,)) + return data[:9] + chr(ord(data[9])^0x02) + data[10:] + +def _corrupt_block_hashes(data, debug=False): """Scramble the file data -- the field containing the block hash tree will have one bit flipped or else will be changed to a random value. """ @@ -1349,7 +1366,7 @@ def _corrupt_block_hashes(data): return corrupt_field(data, blockhashesoffset, sharehashesoffset-blockhashesoffset) -def _corrupt_share_hashes(data): +def _corrupt_share_hashes(data, debug=False): """Scramble the file data -- the field containing the share hash chain will have one bit flipped or else will be changed to a random value. """ @@ -1364,7 +1381,7 @@ def _corrupt_share_hashes(data): return corrupt_field(data, sharehashesoffset, uriextoffset-sharehashesoffset) -def _corrupt_length_of_uri_extension(data): +def _corrupt_length_of_uri_extension(data, debug=False): """Scramble the file data -- the field showing the length of the uri extension will have one bit flipped or else will be changed to a random value.""" @@ -1377,7 +1394,7 @@ def _corrupt_length_of_uri_extension(data): uriextoffset = struct.unpack(">Q", data[0x0c+0x3c:0x0c+0x3c+8])[0] return corrupt_field(data, uriextoffset, 8) -def _corrupt_uri_extension(data): +def _corrupt_uri_extension(data, debug=False): """Scramble the file data -- the field containing the uri extension will have one bit flipped or else will be changed to a random value.""" sharevernum = struct.unpack(">L", data[0x0c:0x0c+4])[0] diff --git a/src/allmydata/test/no_network.py b/src/allmydata/test/no_network.py index d1fa8340..5e48e52e 100644 --- a/src/allmydata/test/no_network.py +++ b/src/allmydata/test/no_network.py @@ -301,11 +301,11 @@ class GridTestMixin: corruptdata = corruptor_function(sharedata) open(sharefile, "wb").write(corruptdata) - def corrupt_shares_numbered(self, uri, shnums, corruptor): + def corrupt_shares_numbered(self, uri, shnums, corruptor, debug=False): for (i_shnum, i_serverid, i_sharefile) in self.find_shares(uri): if i_shnum in shnums: sharedata = open(i_sharefile, "rb").read() - corruptdata = corruptor(sharedata) + corruptdata = corruptor(sharedata, debug=debug) open(i_sharefile, "wb").write(corruptdata) def GET(self, urlpath, followRedirect=False, return_response=False, diff --git a/src/allmydata/test/test_repairer.py b/src/allmydata/test/test_repairer.py index 8c14f74e..cedb938f 100644 --- a/src/allmydata/test/test_repairer.py +++ b/src/allmydata/test/test_repairer.py @@ -101,13 +101,13 @@ class Verifier(GridTestMixin, unittest.TestCase, RepairTestMixin): d.addCallback(_check2) return d - def _help_test_verify(self, corruptor, judgement, shnum=0): + def _help_test_verify(self, corruptor, judgement, shnum=0, debug=False): self.set_up_grid(num_clients=2) d = self.upload_and_stash() d.addCallback(lambda ignored: self._stash_counts()) d.addCallback(lambda ignored: - self.corrupt_shares_numbered(self.uri, [shnum],corruptor)) + self.corrupt_shares_numbered(self.uri, [shnum],corruptor,debug=debug)) d.addCallback(lambda ignored: self.c1_filenode.check(Monitor(), verify=True)) def _check(vr): @@ -281,6 +281,12 @@ class Verifier(GridTestMixin, unittest.TestCase, RepairTestMixin): return self._help_test_verify(common._corrupt_crypttext_hash_tree, self.judge_invisible_corruption) + def test_corrupt_crypttext_hashtree_byte_9_bit_7(self): + self.basedir = "repairer/Verify/corrupt_crypttext_hashtree" + return self._help_test_verify(common._corrupt_crypttext_hash_tree_byte_9_bit_7, + self.judge_invisible_corruption, debug=False) + test_corrupt_crypttext_hashtree_byte_9_bit_7.todo = "fix this please! This is #819. (Brian or Zooko probably) (You can start by setting debug=True.)" + def test_corrupt_block_hashtree(self): self.basedir = "repairer/Verify/corrupt_block_hashtree" return self._help_test_verify(common._corrupt_block_hashes,