Only caches download network-status for now, and they use a different strategy. Add an element to connection_t to remember what we are downloading, and a function to recognize our own fingerprint.

svn:r4944

src/or/connection.c

@@ -231,6 +231,7 @@ _connection_free(connection_t *conn)
   tor_free(conn->incoming_cmd);
   tor_free(conn->read_event); /* Probably already freed by connection_free. */
   tor_free(conn->write_event); /* Probably already freed by connection_free. */
+  tor_free(conn->requested_resource);
 
   if (conn->s >= 0) {
     log_fn(LOG_INFO,"closing fd %d.",conn->s);

src/or/directory.c

@@ -180,9 +180,6 @@ directory_get_from_dirserver(uint8_t purpose, const char *resource,
       char digest[DIGEST_LEN];
       base16_decode(digest, DIGEST_LEN, resource+3, HEX_DIGEST_LEN);
       ds = router_get_trusteddirserver_by_digest(digest);
-      // XXXXX NM remove this.
-      log_fn(LOG_NOTICE, "Going straight to the authority for %s? %s",resource,
-             ds? "Ok.":"Oops. I can't.");
     }
     if (!ds && fetch_fresh_first) {
       /* only ask authdirservers, and don't ask myself */
@@ -403,6 +400,9 @@ directory_send_command(connection_t *conn, const char *platform,
   tor_assert(conn);
   tor_assert(conn->type == CONN_TYPE_DIR);
 
+  tor_free(conn->requested_resource);
+  conn->requested_resource = tor_strdup(resource);
+
   /* come up with a string for which Host: we want */
   if (conn->port == 80) {
     strlcpy(hoststring, conn->address, sizeof(hoststring));
@@ -453,7 +453,6 @@ directory_send_command(connection_t *conn, const char *platform,
       httpcommand = "GET";//XXXX
       len = strlen(resource)+32;
       url = tor_malloc(len);
-      log_fn(LOG_NOTICE, "Asking for %s", resource);
       tor_snprintf(url, len, "/tor/status/%s", resource);
       break;
     case DIR_PURPOSE_FETCH_SERVERDESC:
@@ -889,7 +888,8 @@ connection_dir_client_reached_eof(connection_t *conn)
 
   if (conn->purpose == DIR_PURPOSE_FETCH_NETWORKSTATUS) {
     /* XXXX NM We *must* make certain we get the one(s) we asked for or we
-     * could be partitioned. */
+     * could be partitioned. Also, never ask someone else for a status we
+     * generated! */
     log_fn(LOG_INFO,"Received networkstatus objects (size %d) from server '%s:%d'",(int) body_len, conn->address, conn->port);
     if (status_code != 200) {
       log_fn(LOG_WARN,"Received http status code %d (\"%s\") from server '%s:%d'. Failing.",

src/or/dirserv.c

@@ -1183,15 +1183,13 @@ dirserv_get_networkstatus_v2(smartlist_t *result,
       smartlist_add(result, val);
     }
   } else if (!strcmpstart(key, "fp/")) {
-    char own_fp[HEX_DIGEST_LEN+1];
-    crypto_pk_get_fingerprint(get_identity_key(), own_fp, 0);
     smartlist_t *hexdigests = smartlist_create();
     smartlist_split_string(hexdigests, key+3, "+", 0, 0);
     SMARTLIST_FOREACH(hexdigests, char *, cp,
         {
           cached_dir_t *cached;
           tor_strupper(cp);
-          if (!strcmp(cp, own_fp) &&
+          if (router_fingerprint_is_me(cp) &&
               get_options()->AuthoritativeDir &&
               the_v2_networkstatus_is_dirty &&
               the_v2_networkstatus_is_dirty + DIR_REGEN_SLACK_TIME < time(NULL))

src/or/main.c

@@ -732,7 +732,12 @@ run_scheduled_events(time_t now)
         !we_are_hibernating())
       consider_testing_reachability();
 
-    update_networkstatus_downloads();
+    if (server_mode(options) && options->DirPort)
+      update_networkstatus_cache_downloads(now);
+    /* XXXX Disabled until 0.1.1.6 is out: only servers need networkstatus.
+    else
+      update_networkstatus_client_downloads(now);
+    */
   }
 
   /** 3a. Every second, we examine pending circuits and prune the

src/or/or.h

@@ -673,7 +673,10 @@ struct connection_t {
   struct circuit_t *on_circuit; /**< The circuit (if any) that this edge
                                  * connection is using. */
 
-  /* Used only by AP connections */
+/* Used only by Dir connections */
+  char *requested_resource; /**< Which 'resource' did we ask the directory for?*/
+
+/* Used only by AP connections */
   socks_request_t *socks_request; /**< SOCKS structure describing request (AP
                                    * only.) */
 
@@ -1997,6 +2000,7 @@ routerinfo_t *router_get_my_routerinfo(void);
 const char *router_get_my_descriptor(void);
 int router_digest_is_me(const char *digest);
 int router_is_me(routerinfo_t *router);
+int router_fingerprint_is_me(const char *fp);
 int router_rebuild_descriptor(int force);
 int router_dump_router_to_string(char *s, size_t maxlen, routerinfo_t *router,
                                  crypto_pk_env_t *ident_key);
@@ -2088,7 +2092,8 @@ void add_trusted_dir_server(const char *addr, uint16_t port,
                             const char *digest, int supports_v1);
 void clear_trusted_dir_servers(void);
 networkstatus_t *networkstatus_get_by_digest(const char *digest);
-void update_networkstatus_downloads(void);
+void update_networkstatus_cache_downloads(time_t now);
+void update_networkstatus_client_downloads(time_t now);
 
 /********************************* routerparse.c ************************/
 

src/or/router.c

@@ -676,6 +676,18 @@ router_is_me(routerinfo_t *router)
   return router_digest_is_me(router->identity_digest);
 }
 
+/** Return true iff <b>fp</b> is a hex fingerprint of my identity digest. */
+int
+router_fingerprint_is_me(const char *fp)
+{
+  char digest[DIGEST_LEN];
+  if (strlen(fp) == HEX_DIGEST_LEN &&
+      base16_decode(digest, sizeof(digest), fp, HEX_DIGEST_LEN) == 0)
+    return router_digest_is_me(digest);
+
+  return 0;
+}
+
 /** Return a routerinfo for this OR, rebuilding a fresh one if
  * necessary.  Return NULL on error, or if called on an OP. */
 routerinfo_t *

src/or/routerlist.c

@@ -1208,8 +1208,6 @@ router_set_networkstatus(const char *s, time_t arrived_at, int is_cached)
   time_t now;
   char fp[HEX_DIGEST_LEN+1];
 
-  log_fn(LOG_NOTICE, "setting status (%d)", is_cached);
-
   ns = networkstatus_parse_from_string(s);
   if (!ns) {
     log_fn(LOG_WARN, "Couldn't parse network status.");
@@ -1277,19 +1275,54 @@ router_set_networkstatus(const char *s, time_t arrived_at, int is_cached)
   return 0;
 }
 
+/* These should be configurable, perhaps. */
+#define AUTHORITY_NS_CACHE_INTERVAL 10*60
+#define NONAUTHORITY_NS_CACHE_INTERVAL 15*60
+void
+update_networkstatus_cache_downloads(time_t now)
+{
+  static time_t last_downloaded = 0;
+  int authority = authdir_mode(get_options());
+  int interval =
+    authority ? AUTHORITY_NS_CACHE_INTERVAL : NONAUTHORITY_NS_CACHE_INTERVAL;
+
+  if (last_downloaded + interval >= now)
+    return;
+  if (!trusted_dir_servers)
+    return;
+
+  last_downloaded = now;
+
+  if (authority) {
+    /* An authority launches a separate connection for everybody. */
+    SMARTLIST_FOREACH(trusted_dir_servers, trusted_dir_server_t *, ds,
+       {
+         char resource[HEX_DIGEST_LEN+6];
+         if (router_digest_is_me(ds->digest))
+           continue;
+         strlcpy(resource, "fp/", sizeof(resource));
+         base16_encode(resource+3, sizeof(resource)-3, ds->digest, DIGEST_LEN);
+         strlcat(resource, ".z", sizeof(resource));
+         directory_get_from_dirserver(DIR_PURPOSE_FETCH_NETWORKSTATUS,resource,1);
+       });
+  } else {
+    /* A non-authority cache launches one connection to a random authority. */
+    directory_get_from_dirserver(DIR_PURPOSE_FETCH_NETWORKSTATUS,"all.z",1);
+  }
+}
+
+#define ABOUT_TWO_DAYS (48*60*60)
+#define ABOUT_HALF_AN_HOUR (30*60)
 /** DOCDOC */
 void
-update_networkstatus_downloads(void)
+update_networkstatus_client_downloads(time_t now)
 {
   /* XXX Yes, these constants are supposed to be dumb, so we can choose better
    * values. */
-#define ABOUT_TWO_DAYS (48*60*60)
-#define ABOUT_HALF_AN_HOUR (30*60)
   int n_live = 0, needed = 0, n_dirservers, i;
   int most_recent_idx = -1;
   trusted_dir_server_t *most_recent = NULL;
   time_t most_recent_received = 0;
-  time_t now = time(NULL);
 
   /* This is a little tricky.  We want to download enough network-status
    * objects so that we have at least half of them under ABOUT_TWO_DAYS
@@ -1332,13 +1365,14 @@ update_networkstatus_downloads(void)
   /* XXXX NM This could compress multiple downloads into a single request.
    * It could also be smarter on failures. */
   for (i = most_recent_idx+1; needed; ++i) {
-    char resource[HEX_DIGEST_LEN+4];
+    char resource[HEX_DIGEST_LEN+6];
     trusted_dir_server_t *ds;
     if (i >= n_dirservers)
       i = 0;
     ds = smartlist_get(trusted_dir_servers, i);
     strlcpy(resource, "fp/", sizeof(resource));
     base16_encode(resource+3, sizeof(resource)-3, ds->digest, DIGEST_LEN);
+    strlcat(resource, ".z", sizeof(resource));
     directory_get_from_dirserver(DIR_PURPOSE_FETCH_NETWORKSTATUS, resource, 1);
     --needed;
   }