after failing from resolve failed or misc, reset the num failures.

svn:r4780

src/or/connection_edge.c

@@ -652,8 +652,7 @@ addressmap_register(const char *address, char *new_address, time_t expires)
 int
 client_dns_incr_failures(const char *address)
 {
-  addressmap_entry_t *ent;
-  ent = strmap_get(addressmap,address);
+  addressmap_entry_t *ent = strmap_get(addressmap, address);
   if (!ent) {
     ent = tor_malloc_zero(sizeof(addressmap_entry_t));
     ent->expires = time(NULL)+MAX_DNS_ENTRY_AGE;
@@ -665,6 +664,19 @@ client_dns_incr_failures(const char *address)
   return ent->num_resolve_failures;
 }
 
+/** If <b>address</b> is in the client dns addressmap, reset
+ * the number of resolve failures we have on record for it.
+ * This is used when we fail a stream because it won't resolve:
+ * otherwise future attempts on that address will only try once.
+ */
+void
+client_dns_clear_failures(const char *address)
+{
+  addressmap_entry_t *ent = strmap_get(addressmap, address);
+  if (ent)
+    ent->num_resolve_failures = 0;
+}
+
 /** Record the fact that <b>address</b> resolved to <b>val</b>.
  * We can now use this in subsequent streams via addressmap_rewrite()
  * so we can more correctly choose an exit that will allow <b>address</b>.

src/or/or.h

@@ -1490,6 +1490,7 @@ void addressmap_rewrite(char *address, size_t maxlen);
 int addressmap_already_mapped(const char *address);
 void addressmap_register(const char *address, char *new_address, time_t expires);
 int client_dns_incr_failures(const char *address);
+void client_dns_clear_failures(const char *address);
 void client_dns_set_addressmap(const char *address, uint32_t val, const char *exitname);
 const char *addressmap_register_virtual_address(int type, char *new_address);
 void addressmap_get_mappings(smartlist_t *sl, time_t min_expires, time_t max_expires);

src/or/relay.c

@@ -678,6 +678,8 @@ connection_edge_process_end_not_open(
         } else {
           log_fn(LOG_NOTICE,"Have tried resolving address '%s' at %d different places. Giving up.",
                  safe_str(conn->socks_request->address), MAX_RESOLVE_FAILURES);
+          /* clear the failures, so it will have a full try next time */
+          client_dns_clear_failures(conn->socks_request->address);
         }
         break;
       case END_STREAM_REASON_HIBERNATING: