Re: [tor-bugs] #11965 [Tor]: 60-second pause bootstrapping with a bridge if you already have its descriptor

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#11965: 60-second pause bootstrapping with a bridge if you already have its
descriptor
------------------------+--------------------------------
     Reporter:  arma    |      Owner:
         Type:  defect  |     Status:  needs_review
     Priority:  normal  |  Milestone:  Tor: 0.2.5.x-final
    Component:  Tor     |    Version:
   Resolution:          |   Keywords:  tor-bridge
Actual Points:          |  Parent ID:
       Points:          |
------------------------+--------------------------------
Changes (by arma):

 * status:  new => needs_review


Comment:

 Part 1 of my suggested fix is to call directory_info_has_arrived() from
 directory.c even when we didn't find anything novel in what we fetched:

 {{{
 diff --git a/src/or/directory.c b/src/or/directory.c
 index b94aac4..2d04c67 100644
 --- a/src/or/directory.c
 +++ b/src/or/directory.c
 @@ -1901,10 +1901,10 @@ connection_dir_client_reached_eof(dir_connection_t
 *conn
        } else {
          //router_load_routers_from_string(body, NULL, SAVED_NOWHERE,
 which,
          //                       descriptor_digests,
 conn->router_purpose);
 -        if (load_downloaded_routers(body, which, descriptor_digests,
 +        load_downloaded_routers(body, which, descriptor_digests,
                                  conn->router_purpose,
 -                                conn->base_.address))
 -          directory_info_has_arrived(now, 0);
 +                                conn->base_.address);
 +        directory_info_has_arrived(now, 0);
        }
      }
      if (which) { /* mark remaining ones as failed */
 }}}

 and then part 2 is to make directory_info_has_arrived() see if it wants to
 fetch consensus stuff as well as descriptor stuff:

 {{{
 diff --git a/src/or/main.c b/src/or/main.c
 index 5532026..20b64ec 100644
 --- a/src/or/main.c
 +++ b/src/or/main.c
 @@ -980,10 +980,12 @@ directory_info_has_arrived(time_t now, int
 from_cache)
      tor_log(quiet ? LOG_INFO : LOG_NOTICE, LD_DIR,
          "I learned some more directory information, but not enough to "
          "build a circuit: %s", get_dir_info_status_string());
 +    update_networkstatus_downloads(now);
      update_all_descriptor_downloads(now);
      return;
    } else {
      if (directory_fetches_from_authorities(options)) {
 +      update_networkstatus_downloads(now);
        update_all_descriptor_downloads(now);
      }
 }}}

 For normal users, they will already have their consensus stuff by this
 point, so it will conclude "no, no need to fetch any of that". But for
 bridge users, inviting them to fetch descriptors or microdescriptors is
 premature, since they don't have any consensus yet.

 And then the optional part three of the patch, maybe to be applied later,
 is to remove the
 {{{
       if (first) {
         routerlist_retry_directory_downloads(now);
       }
 }}}
 clause from learned_bridge_descriptor() since now I think it's redundant.
 As a bonus, that means we also blow away the num_bridges_usable() function
 since nothing else uses it.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/11965#comment:1>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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