Apply fix for bug 997.

Hidden service clients didn't use a cached service descriptor that
was older than 15 minutes, but wouldn't fetch a new one either. Now,
use a cached descriptor no matter how old it is and only fetch a new
one when all introduction points fail. Fix for bug 997. Patch from
Marcus Griep.

ChangeLog

@@ -13,6 +13,13 @@ Changes in version 0.2.2.1-alpha - 2009-??-??
     - Directories that are configured with the --enable-geoip-stats flag
       now write their GeoIP stats to disk exactly every 24 hours.
 
+  o Minor bugfixes
+    - Hidden service clients didn't use a cached service descriptor that
+      was older than 15 minutes, but wouldn't fetch a new one either. Now,
+      use a cached descriptor no matter how old it is and only fetch a new
+      one when all introduction points fail. Fix for bug 997. Patch from
+      Marcus Griep.
+
   o Deprecated and removed features:
     - The controller no longer accepts the old obsolete "addr-mappings/"
       GETINFO value.

src/or/connection_edge.c

@@ -1678,22 +1678,12 @@ connection_ap_handshake_rewrite_and_attach(edge_connection_t *conn,
                safe_str(conn->rend_data->onion_address));
       rend_client_refetch_v2_renddesc(conn->rend_data);
     } else { /* r > 0 */
-/** How long after we receive a hidden service descriptor do we consider
- * it valid? */
-#define NUM_SECONDS_BEFORE_HS_REFETCH (60*15)
-      if (now - entry->received < NUM_SECONDS_BEFORE_HS_REFETCH) {
-        conn->_base.state = AP_CONN_STATE_CIRCUIT_WAIT;
-        log_info(LD_REND, "Descriptor is here and fresh enough. Great.");
-        if (connection_ap_handshake_attach_circuit(conn) < 0) {
-          if (!conn->_base.marked_for_close)
-            connection_mark_unattached_ap(conn, END_STREAM_REASON_CANT_ATTACH);
-          return -1;
-        }
-      } else {
-        conn->_base.state = AP_CONN_STATE_RENDDESC_WAIT;
-        log_info(LD_REND, "Stale descriptor %s. Re-fetching.",
-                 safe_str(conn->rend_data->onion_address));
-        rend_client_refetch_v2_renddesc(conn->rend_data);
+      conn->_base.state = AP_CONN_STATE_CIRCUIT_WAIT;
+      log_info(LD_REND, "Descriptor is here. Great.");
+      if (connection_ap_handshake_attach_circuit(conn) < 0) {
+        if (!conn->_base.marked_for_close)
+          connection_mark_unattached_ap(conn, END_STREAM_REASON_CANT_ATTACH);
+        return -1;
       }
     }
     return 0;