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.

1 files changed, 8 insertions, 1 deletions

diff --git a/src/feature/nodelist/networkstatus.c b/src/feature/nodelist/networkstatus.c
index e07d58c91c..8e47fafd3c 100644
--- 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)) {