Fetch cached running-routers from servers that serve it (that is, authdirservers, and servers running 0.0.9rc5-cvs or later.)

svn:r3018

doc/TODO

@@ -12,12 +12,14 @@ ARMA    - arma claims
 
 For 0.0.9:
 N&R- bring tor-spec up to date
-N  . cache and serve running-routers on other nodes?
+   o cache and serve running-routers on other nodes?
-     . cache running-routers
+     o cache running-routers
-     - download running-routers from servers running rc5-cvs or later
+     o download running-routers from servers running rc5-cvs or later
 N  - pump up periods for fetching things; figure out how to do this
      backward-compatibily, so that people who did set dirfetchpostperiod
      get the right behavior.
+     - If dirport is set, we should have a maximum dirfetchperiod and
+       a maximum statusfetchperiod, or else we'll serve very stale stuff.
 N  - Adapt version parsing code to handle new version scheme; document new
      version scheme.
 N&R. make loglevels info,debug less noisy

src/or/directory.c

@@ -152,21 +152,22 @@ directory_get_from_dirserver(uint8_t purpose, const char *resource)
   trusted_dir_server_t *ds = NULL;
   int fascistfirewall = get_options()->FascistFirewall;
 
-  if (purpose == DIR_PURPOSE_FETCH_DIR) {
+  if (purpose == DIR_PURPOSE_FETCH_DIR ||
+      purpose == DIR_PURPOSE_FETCH_RUNNING_LIST) {
     if (advertised_server_mode()) {
       /* only ask authdirservers, and don't ask myself */
       ds = router_pick_trusteddirserver(1, fascistfirewall);
     } else {
       /* anybody with a non-zero dirport will do */
-      r = router_pick_directory_server(1, fascistfirewall);
+      r = router_pick_directory_server(1, fascistfirewall,
+                                purpose==DIR_PURPOSE_FETCH_RUNNING_LIST);
       if (!r) {
-        log_fn(LOG_INFO, "No router found for directory; falling back to dirserver list");
+        log_fn(LOG_INFO, "No router found for %s; falling back to dirserver list",
+               purpose == DIR_PURPOSE_FETCH_RUNNING_LIST
+               ? "status list" : "directory");
         ds = router_pick_trusteddirserver(1, fascistfirewall);
       }
     }
-  } else if (purpose == DIR_PURPOSE_FETCH_RUNNING_LIST) {
-    /* right now, running-routers isn't cached, so ask a trusted directory */
-    ds = router_pick_trusteddirserver(0, fascistfirewall);
   } else { // (purpose == DIR_PURPOSE_FETCH_RENDDESC)
     /* only ask authdirservers, any of them will do */
     /* Never use fascistfirewall; we're going via Tor. */

src/or/or.h

@@ -1560,7 +1560,7 @@ typedef struct trusted_dir_server_t {
 
 int router_reload_router_list(void);
 void router_get_trusted_dir_servers(smartlist_t **outp);
-routerinfo_t *router_pick_directory_server(int requireothers, int fascistfirewall);
+routerinfo_t *router_pick_directory_server(int requireothers, int fascistfirewall, int for_running_routers);
 trusted_dir_server_t *router_pick_trusteddirserver(int requireothers, int fascistfirewall);
 int all_trusted_directory_servers_down(void);
 struct smartlist_t;

src/or/routerlist.c

@@ -20,7 +20,8 @@ static smartlist_t *trusted_dir_servers = NULL;
 
 /* static function prototypes */
 static routerinfo_t *
-router_pick_directory_server_impl(int requireothers, int fascistfirewall);
+router_pick_directory_server_impl(int requireothers, int fascistfirewall,
+                                  int for_runningrouters);
 static trusted_dir_server_t *
 router_pick_trusteddirserver_impl(int requireother, int fascistfirewall);
 static void mark_all_trusteddirservers_up(void);
@@ -87,15 +88,20 @@ void router_get_trusted_dir_servers(smartlist_t **outp)
 /** Try to find a running dirserver. If there are no running dirservers
  * in our routerlist, set all the authoritative ones as running again,
  * and pick one. If there are no dirservers at all in our routerlist,
- * reload the routerlist and try one last time. */
+ * reload the routerlist and try one last time.  If for_runningrouters is
+ * true, then only pick a dirserver that can answer runningrouters queries
+ * (that is, a trusted dirserver, or one running 0.0.9rc5-cvs or later).
+ */
 routerinfo_t *router_pick_directory_server(int requireothers,
-                                           int fascistfirewall) {
+                                           int fascistfirewall,
+                                           int for_runningrouters) {
   routerinfo_t *choice;
 
   if (!routerlist)
     return NULL;
 
-  choice = router_pick_directory_server_impl(requireothers, fascistfirewall);
+  choice = router_pick_directory_server_impl(requireothers, fascistfirewall,
+                                             for_runningrouters);
   if (choice)
     return choice;
 
@@ -103,7 +109,8 @@ routerinfo_t *router_pick_directory_server(int requireothers,
   /* mark all authdirservers as up again */
   mark_all_trusteddirservers_up();
   /* try again */
-  choice = router_pick_directory_server_impl(requireothers, fascistfirewall);
+  choice = router_pick_directory_server_impl(requireothers, fascistfirewall,
+                                             for_runningrouters);
   if (choice)
     return choice;
 
@@ -114,7 +121,8 @@ routerinfo_t *router_pick_directory_server(int requireothers,
     return NULL;
   }
   /* give it one last try */
-  choice = router_pick_directory_server_impl(requireothers, 0);
+  choice = router_pick_directory_server_impl(requireothers, 0,
+                                             for_runningrouters);
   return choice;
 }
 
@@ -149,7 +157,8 @@ trusted_dir_server_t *router_pick_trusteddirserver(int requireothers,
  * it has to be a trusted server. If requireothers, it cannot be us.
  */
 static routerinfo_t *
-router_pick_directory_server_impl(int requireothers, int fascistfirewall)
+router_pick_directory_server_impl(int requireothers, int fascistfirewall,
+                                  int for_runningrouters)
 {
   int i;
   routerinfo_t *router;
@@ -175,6 +184,11 @@ router_pick_directory_server_impl(int requireothers, int fascistfirewall)
       if (!smartlist_string_isin(get_options()->FirewallPorts, buf))
         continue;
     }
+    /* before 0.0.9rc5-cvs, only trusted dirservers served status info. */
+    if (for_runningrouters &&
+        !(tor_version_as_new_as(router->platform,"0.0.9rc5-cvs") ||
+          router_digest_is_trusted_dir(router->identity_digest)))
+      continue;
     smartlist_add(sl, router);
   }