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Entry Nodes: Use a reasonably live consensus to select guards

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Fixes bug 24661; bugfix on 0.3.0.1-alpha.
This commit is contained in:
teor 2018-11-05 15:27:38 +10:00
parent a9820f072b
commit d1ac5613fc
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GPG key ID: 10FEAA0E7075672A
2 changed files with 20 additions and 10 deletions
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3
changes/bug24661 Normal file
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@ -0,0 +1,3 @@
o Minor bugfixes (client, guard selection):
- When Tor's consensus has expired, but is still reasonably live, use it
to select guards. Fixes bug 24661; bugfix on 0.3.0.1-alpha.

27
src/feature/client/entrynodes.c
View file

@ -287,7 +287,9 @@ create_initial_guard_context(void)
guard_selection_type_t type = GS_TYPE_INFER;
const char *name = choose_guard_selection(
get_options(),
networkstatus_get_live_consensus(approx_time()),
networkstatus_get_reasonably_live_consensus(
approx_time(),
usable_consensus_flavor()),
NULL,
&type);
tor_assert(name); // "name" can only be NULL if we had an old name.
@ -726,7 +728,9 @@ update_guard_selection_choice(const or_options_t *options)
guard_selection_type_t type = GS_TYPE_INFER;
const char *new_name = choose_guard_selection(
options,
networkstatus_get_live_consensus(approx_time()),
networkstatus_get_reasonably_live_consensus(
approx_time(),
usable_consensus_flavor()),
curr_guard_context,
&type);
tor_assert(new_name);
@ -1125,14 +1129,16 @@ select_and_add_guard_item_for_sample(guard_selection_t *gs,
* or if we don't need a consensus because we're using bridges.)
*/
static int
live_consensus_is_missing(const guard_selection_t *gs)
reasonably_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;
return networkstatus_get_reasonably_live_consensus(
approx_time(),
usable_consensus_flavor()) == NULL;
}
/**
@ -1147,9 +1153,9 @@ entry_guards_expand_sample(guard_selection_t *gs)
tor_assert(gs);
const or_options_t *options = get_options();
if (live_consensus_is_missing(gs)) {
if (reasonably_live_consensus_is_missing(gs)) {
log_info(LD_GUARD, "Not expanding the sample guard set; we have "
"no live consensus.");
"no reasonably live consensus.");
return NULL;
}
@ -1395,11 +1401,12 @@ sampled_guards_update_from_consensus(guard_selection_t *gs)
{
tor_assert(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 (live_consensus_is_missing(gs)) {
// It's important to use a reasonably live consensus here; we want clients
// to bootstrap even if their clock is skewed by more than 2-3 hours.
// But we don't want to make changes based on anything that's really old.
if (reasonably_live_consensus_is_missing(gs)) {
log_info(LD_GUARD, "Not updating the sample guard set; we have "
"no live consensus.");
"no reasonably live consensus.");
return;
}
log_info(LD_GUARD, "Updating sampled guard status based on received "