Fix unit test failure in dir/formats

options->DirPort is 0 in the unit tests, so
router_get_advertised_dir_port() would return 0 so we wouldn't pick a
dirport. This isn't what we want for the unit tests. Fixes bug
introduced in 95ac3ea5946.

src/or/connection.c

@@ -1952,7 +1952,7 @@ retry_all_listeners(smartlist_t *replaced_conns,
   or_options_t *options = get_options();
   int retval = 0;
   const uint16_t old_or_port = router_get_advertised_or_port(options);
-  const uint16_t old_dir_port = router_get_advertised_dir_port(options);
+  const uint16_t old_dir_port = router_get_advertised_dir_port(options, 0);
 
   if (retry_listeners(CONN_TYPE_OR_LISTENER, options->ORListenAddress,
                       options->ORPort, "0.0.0.0",
@@ -1998,7 +1998,7 @@ retry_all_listeners(smartlist_t *replaced_conns,
     return -1;
 
   if (old_or_port != router_get_advertised_or_port(options) ||
-      old_dir_port != router_get_advertised_dir_port(options)) {
+      old_dir_port != router_get_advertised_dir_port(options, 0)) {
     /* Our chosen ORPort or DirPort is not what it used to be: the
      * descriptor we had (if any) should be regenerated.  (We won't
      * automatically notice this because of changes in the option,

src/or/dirserv.c

@@ -2705,7 +2705,7 @@ dirserv_generate_networkstatus_vote_obj(crypto_pk_env_t *private_key,
   voter->sigs = smartlist_create();
   voter->address = hostname;
   voter->addr = addr;
-  voter->dir_port = router_get_advertised_dir_port(options);
+  voter->dir_port = router_get_advertised_dir_port(options, 0);
   voter->or_port = router_get_advertised_or_port(options);
   voter->contact = tor_strdup(contact);
   if (options->V3AuthUseLegacyKey) {
@@ -2812,7 +2812,8 @@ generate_v2_networkstatus_opinion(void)
                "dir-options%s%s%s%s\n"
                "%s" /* client version line, server version line. */
                "dir-signing-key\n%s",
-               hostname, ipaddr, (int)router_get_advertised_dir_port(options),
+               hostname, ipaddr,
+               (int)router_get_advertised_dir_port(options, 0),
                fingerprint,
                contact,
                published,

src/or/router.c

@@ -704,7 +704,7 @@ init_keys(void)
   ds = router_get_trusteddirserver_by_digest(digest);
   if (!ds) {
     ds = add_trusted_dir_server(options->Nickname, NULL,
-                                router_get_advertised_dir_port(options),
+                                router_get_advertised_dir_port(options, 0),
                                 router_get_advertised_or_port(options),
                                 digest,
                                 v3_digest,
@@ -802,7 +802,7 @@ decide_to_advertise_dirport(or_options_t *options, uint16_t dir_port)
     return 0;
   if (!check_whether_dirport_reachable())
     return 0;
-  if (!router_get_advertised_dir_port(options))
+  if (!router_get_advertised_dir_port(options, dir_port))
     return 0;
 
   /* Section two: reasons to publish or not publish that the user
@@ -1184,12 +1184,16 @@ router_get_advertised_or_port(or_options_t *options)
   return options->ORPort;
 }
 
-/** Return the port that we should advertise as our DirPort; this is either
- * the one configured in the DirPort option, or the one we actually bound to
- * if DirPort is "auto". */
+/** Return the port that we should advertise as our DirPort;
+ * this is one of three possibilities:
+ * The one that is passed as <b>dirport</b> if the DirPort option is 0, or
+ * the one configured in the DirPort option,
+ * or the one we actually bound to if DirPort is "auto". */
 uint16_t
-router_get_advertised_dir_port(or_options_t *options)
+router_get_advertised_dir_port(or_options_t *options, uint16_t dirport)
 {
+  if (!options->DirPort)
+    return dirport;
   if (options->DirPort == CFG_AUTO_PORT) {
     connection_t *c = connection_get_by_type(CONN_TYPE_DIR_LISTENER);
     if (c)
@@ -1440,7 +1444,7 @@ router_rebuild_descriptor(int force)
   ri->nickname = tor_strdup(options->Nickname);
   ri->addr = addr;
   ri->or_port = router_get_advertised_or_port(options);
-  ri->dir_port = router_get_advertised_dir_port(options);
+  ri->dir_port = router_get_advertised_dir_port(options, 0);
   ri->cache_info.published_on = time(NULL);
   ri->onion_pkey = crypto_pk_dup_key(get_onion_key()); /* must invoke from
                                                         * main thread */

src/or/router.h

@@ -51,7 +51,8 @@ int authdir_mode_tests_reachability(or_options_t *options);
 int authdir_mode_bridge(or_options_t *options);
 
 uint16_t router_get_advertised_or_port(or_options_t *options);
-uint16_t router_get_advertised_dir_port(or_options_t *options);
+uint16_t router_get_advertised_dir_port(or_options_t *options,
+                                        uint16_t dirport);
 
 int server_mode(or_options_t *options);
 int public_server_mode(or_options_t *options);