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Use digest256_len in networkstatus_copy_old_consensus_info()

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Now, if a router ever changes its microdescriptor, but the new
microdescriptor SHA256 hash has the same 160-bit prefix as the old
one, we treat it as a new microdescriptor when deciding whether to
copy status information.

(This function also is used to compare SHA1 digests of router
descriptors, but don't worry: the descriptor_digest field either holds
a SHA256 hash, or a SHA1 hash padded with 0 bytes.)
This commit is contained in:
Nick Mathewson 2014-10-31 11:36:31 -04:00
parent dc05b8549a
commit efd5001c3b
2 changed files with 6 additions and 1 deletions
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5
changes/bug13399
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@ -5,3 +5,8 @@
the same first 160 bits. Fixes part of bug 13399; bugfix on
0.2.3.1-alpha.
- Reset a router's status if its microdescriptor digest changes,
even if the first 160 bits remain the same. Fixes part of bug
13399; bugfix on 0.2.3.1-alpha.

2
src/or/networkstatus.c
View File

@ -1123,7 +1123,7 @@ networkstatus_copy_old_consensus_info(networkstatus_t *new_c,
rs_new->last_dir_503_at = rs_old->last_dir_503_at;
if (tor_memeq(rs_old->descriptor_digest, rs_new->descriptor_digest,
DIGEST_LEN)) { /* XXXX Change this to digest256_len */
DIGEST256_LEN)) {
/* And the same descriptor too! */
memcpy(&rs_new->dl_status, &rs_old->dl_status,sizeof(download_status_t));
}