tor

commit 56f1cab9c12349538c5526de92d6e64fecb81184
parent 49c61c1bb85fa557a6a47f41cfab435a82a6d82f
Author: Nick Mathewson <nickm@torproject.org>
Date:   Mon,  8 Feb 2021 11:52:53 -0500

Don't log supported-protover warnings if consensus is older than Tor.

Previously we would warn in this case... but there's really no
justification for doing so, and it can only cause confusion.

Fixes bug #40281; bugfix on 0.4.0.1-alpha.

Diffstat:
A
changes/bug40281
 | 
6
++++++
M
src/feature/nodelist/networkstatus.c
 | 
9
++++++++-

2 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/changes/bug40281 b/changes/bug40281
@@ -0,0 +1,6 @@
+  o Minor bugfixes (logging):
+    - Avoid a spurious log message about missing subprotocol versions, when
+      the consensus that we're reading from is older than the current
+      release. .  Previously we had made this message nonfatal in this case,
+      but in practice, it is never relevant when the consensus is older than
+      the current release.  Fixes bug 40281; bugfix on 0.4.0.1-alpha.
diff --git a/src/feature/nodelist/networkstatus.c b/src/feature/nodelist/networkstatus.c
@@ -2713,6 +2713,13 @@ networkstatus_check_required_protocols(const networkstatus_t *ns,
   const bool consensus_postdates_this_release =
     ns->valid_after >= tor_get_approx_release_date();
 
+  if (! consensus_postdates_this_release) {
+    // We can't meaningfully warn about this case: This consensus is from
+    // before we were released, so whatever is says about required or
+    // recommended versions may no longer be true.
+    return 0;
+  }
+
   tor_assert(warning_out);
 
   if (client_mode) {
@@ -2730,7 +2737,7 @@ networkstatus_check_required_protocols(const networkstatus_t *ns,
                  "%s on the Tor network. The missing protocols are: %s",
                  func, missing);
     tor_free(missing);
-    return consensus_postdates_this_release ? 1 : 0;
+    return 1;
   }
 
   if (! protover_all_supported(recommended, &missing)) {