commit bdd267e74d97cf2672fa2e1e9deb2a33fd755f2c Author: Nick Mathewson nickm@torproject.org Date: Thu Jun 22 09:28:30 2017 -0400
Combine our "don't do this if no consensus" entryguards checks
Suggested by asn on 22400 review. --- src/or/entrynodes.c | 45 ++++++++++++++++++++++----------------------- 1 file changed, 22 insertions(+), 23 deletions(-)
diff --git a/src/or/entrynodes.c b/src/or/entrynodes.c index 34dfdce..aba35e6 100644 --- a/src/or/entrynodes.c +++ b/src/or/entrynodes.c @@ -1093,6 +1093,18 @@ select_and_add_guard_item_for_sample(guard_selection_t *gs, return added_guard; }
+/** Return true iff we need a consensus to maintain our */ +static int +live_consensus_is_missing(const guard_selection_t *gs) +{ + tor_assert(gs); + if (gs->type == GS_TYPE_BRIDGE) { + /* We don't update bridges from the consensus; they aren't there. */ + return 0; + } + return networkstatus_get_live_consensus(approx_time()) == NULL; +} + /** * Add new guards to the sampled guards in <b>gs</b> until there are * enough usable filtered guards, but never grow the sample beyond its @@ -1105,18 +1117,10 @@ entry_guards_expand_sample(guard_selection_t *gs) tor_assert(gs); const or_options_t *options = get_options();
- if (gs->type != GS_TYPE_BRIDGE) { - networkstatus_t *consensus = networkstatus_get_latest_consensus(); - time_t now = approx_time(); - if (consensus == NULL) { - log_info(LD_GUARD, "Not expanding the sample guard set; we have " - "no consensus."); - return NULL; - } else if (!networkstatus_consensus_reasonably_live(consensus, now)) { - log_info(LD_GUARD, "Not expanding the sample guard set; we have " - "a consensus, but it is far too old."); - return NULL; - } + if (live_consensus_is_missing(gs)) { + log_info(LD_GUARD, "Not expanding the sample guard set; we have " + "no live consensus."); + return NULL; }
int n_sampled = smartlist_len(gs->sampled_entry_guards); @@ -1227,18 +1231,13 @@ sampled_guards_update_from_consensus(guard_selection_t *gs)
// It's important to use only a live consensus here; we don't want to // make changes based on anything expired or old. - if (gs->type != GS_TYPE_BRIDGE) { - networkstatus_t *ns = networkstatus_get_live_consensus(approx_time()); - - if (! ns) { - log_info(LD_GUARD, "No live consensus; can't update " - "sampled entry guards."); - return; - } else { - log_info(LD_GUARD, "Updating sampled guard status based on received " - "consensus."); - } + if (live_consensus_is_missing(gs)) { + log_info(LD_GUARD, "Not updating the sample guard set; we have " + "no live consensus."); + return; } + log_info(LD_GUARD, "Updating sampled guard status based on received " + "consensus.");
int n_changes = 0;