Merge remote-tracking branch 'dgoulet/bug16381_026_01-revert' into maint-0.2.6

changes/bug16381

+  o Major bugfix (Hidden service client)
+    - Revert commit 9407040c592184e05e45a3c1a00739c2dd302288 of bug #14219
+      that indeed fixed an issue but introduced a major hidden service
+      reachability regression detailed in bug #16381. This is a temporary
+      fix since we can live with the minor issue in #14219 but the
+      regression introduced is too much of a set back.
+
+      To be clear, #14219 bug just results in some load on the network, and
+      some delay for the client when visiting a hidden service that will
+      ultimately fail.
+
+      This is only a bandaid for #16381 thus it does _not_ fixes it. bugfix
+      on tor-0.2.6.3-alpha~138.

src/or/rendcommon.c

@@ -1249,12 +1249,18 @@ rend_cache_store_v2_desc_as_client(const char *desc,
   /* Do we already have a newer descriptor? */
   tor_snprintf(key, sizeof(key), "2%s", service_id);
   e = (rend_cache_entry_t*) strmap_get_lc(rend_cache, key);
-  if (e && e->parsed->timestamp >= parsed->timestamp) {
-    log_info(LD_REND, "We already have a new enough service descriptor for "
+  if (e && e->parsed->timestamp > parsed->timestamp) {
+    log_info(LD_REND, "We already have a newer service descriptor for "
                       "service ID %s with the same desc ID and version.",
              safe_str_client(service_id));
     goto okay;
   }
+  /* Do we already have this descriptor? */
+  if (e && !strcmp(desc, e->desc)) {
+    log_info(LD_REND,"We already have this service descriptor %s.",
+             safe_str_client(service_id));
+    goto okay;
+  }
   if (!e) {
     e = tor_malloc_zero(sizeof(rend_cache_entry_t));
     strmap_set_lc(rend_cache, key, e);