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Fix check_expired_networkstatus_callback() if condition

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The condition was always true meaning that we would reconsider updating our
directory information every 2 minutes.

If valid_until is 6am today, then now - 24h == 1pm yesterday which means that
"valid_until < (now - 24h)" is false. But at 6:01am tomorrow, "valid_until <
(now - 24h)" becomes true which is that point that we shouldn't trust the
consensus anymore.

Fixes #23091

Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit is contained in:
David Goulet 2017-08-02 13:20:59 -04:00
parent c4c5077af2
commit 5b03c7ba6d
2 changed files with 7 additions and 1 deletions
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6
changes/bug23091 Normal file
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@ -0,0 +1,6 @@
o Minor bugfixes (consensus expiry):
- Tor would reconsider updating its directory information every 2 minutes
instead of only doing it for a consensus that is more than 24 hours old
(badly expired). This specific check is done in the tor main loop
callback that validates if we have an expired consensus. Fixes bug
23091; bugfix on tor-0.2.0.19-alpha.

2
src/or/main.c
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@ -1713,7 +1713,7 @@ check_expired_networkstatus_callback(time_t now, const or_options_t *options)
* networkstatus_get_reasonably_live_consensus(), but that value is way
* way too high. Arma: is the bridge issue there resolved yet? -NM */
#define NS_EXPIRY_SLOP (24*60*60)
if (ns && ns->valid_until < now+NS_EXPIRY_SLOP &&
if (ns && ns->valid_until < (now - NS_EXPIRY_SLOP) &&
router_have_minimum_dir_info()) {
router_dir_info_changed();
}