Opened 5 months ago

Closed 4 months ago

#24486 closed defect (not a bug)

Mark all bridges as up on application activity

Reported by: teor Owned by:
Priority: Medium Milestone: Tor: 0.3.2.x-final
Component: Core Tor/Tor Version: Tor: 0.3.2.1-alpha
Severity: Normal Keywords: regression, tor-bridge-client, s8-errors
Cc: teor, brade, mcs, nickm, asn, catalyst Actual Points:
Parent ID: #24367 Points: 0.5
Reviewer: Sponsor:

Description (last modified by teor)

If circuit_get_open_circ_or_launch() or its callers don't already mark all bridges as up, we should make them do so.

A good way to do this is to:

  • modify the bridge state so we're using the bootstrapping schedule, then
  • reset the download statuses on all bridges, and
  • reset the guard state on all the bridges (?).

Child Tickets

Change History (7)

comment:2 Changed 5 months ago by teor

We want to handle this case better:

diff --git a/src/or/circuituse.c b/src/or/circuituse.c
index aa0df95..8c9859b 100644
--- a/src/or/circuituse.c
+++ b/src/or/circuituse.c
@@ -2084,7 +2084,7 @@ circuit_get_open_circ_or_launch(entry_connection_t *conn,
                "used client functionality lately" :
                "received a consensus with exits",
                options->UseBridges ? "bridges" : "entrynodes");
-      } else if (!options->UseBridges || any_bridge_descriptors_known()) {
+      } else if (!options->UseBridges || num_bridges_usable() > 0) {
         log_fn(severity, LD_APP|LD_DIR,
                "Application request when we haven't %s. "
                "Optimistically trying directory fetches again.",

comment:3 Changed 5 months ago by arma

It's not just about retrying bridge descriptor downloads. It's about being willing to use your bridges even when you previously marked them all as no-longer-running, if it's been a while and you want to try making circuits again, so long as you have a descriptor for them.

In theory there is no reason you would need to first try fetching another descriptor, when the original problem was "my network didn't work for a while and that's why I marked all my bridges down".

comment:4 Changed 5 months ago by teor

Description: modified (diff)
Summary: Retry bridge descriptor downloads on application activityMark all bridges as up on application activity

Fixed the description and title.

comment:5 Changed 4 months ago by teor

Oh, ok, so arma is half-right here. We need to count the number of configured bridges in this code, because the other choices don't do what we want:

  • using any_bridge_descriptors_known() is wrong because it counts cached bridges, and we might not have any cached descriptors, or we might have some of the wrong type
  • using num_bridges_usable() > 0 is wrong because it counts usable bridges, and we might not have any marked as usable

Now I understand this issue, I'm going to review all my changes in #24392 to make sure I chose the right function out of these three different functions.

comment:6 Changed 4 months ago by teor

I think we found the issue in #24392. But let's check.

comment:7 Changed 4 months ago by teor

Resolution: not a bug
Status: newclosed

We are now handling this case better, and the code has been merged. It turns out it was a redundant condition, so this ticket can close.

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