Merge branch 'tor-github/pr/1692'

changes/ticket33091

@@ -0,0 +1,3 @@
+  o Code simplification and refactoring (mainloop):
+    - Simplify the ip_address_changed() function by removing redundant checks.
+      Closes ticket 33091.

src/core/mainloop/connection.c

@@ -4970,10 +4970,10 @@ connection_finished_flushing(connection_t *conn)
   }
 }
 
-/** Called when our attempt to connect() to another server has just
- * succeeded.
+/** Called when our attempt to connect() to a server has just succeeded.
  *
- * This function just passes conn to the connection-specific
+ * This function checks if the interface address has changed (clients only),
+ * and then passes conn to the connection-specific
  * connection_*_finished_connecting() function.
  */
 static int

src/core/mainloop/mainloop.c

@@ -2273,18 +2273,23 @@ systemd_watchdog_callback(periodic_timer_t *timer, void *arg)
 
 #define UPTIME_CUTOFF_FOR_NEW_BANDWIDTH_TEST (6*60*60)
 
-/** Called when our IP address seems to have changed. <b>at_interface</b>
- * should be true if we detected a change in our interface, and false if we
- * detected a change in our published address. */
+/** Called when our IP address seems to have changed. <b>on_client_conn</b>
+ * should be true if:
+ *   - we detected a change in our interface address, using an outbound
+ *     connection, and therefore
+ *   - our client TLS keys need to be rotated.
+ * Otherwise, it should be false, and:
+ *   - we detected a change in our published address
+ *     (using some other method), and therefore
+ *   - the published addresses in our descriptor need to change.
+ */
 void
-ip_address_changed(int at_interface)
+ip_address_changed(int on_client_conn)
 {
   const or_options_t *options = get_options();
   int server = server_mode(options);
-  int exit_reject_interfaces = (server && options->ExitRelay
-                                && options->ExitPolicyRejectLocalInterfaces);
 
-  if (at_interface) {
+  if (on_client_conn) {
     if (! server) {
       /* Okay, change our keys. */
       if (init_keys_client() < 0)
@@ -2296,14 +2301,13 @@ ip_address_changed(int at_interface)
         reset_bandwidth_test();
       reset_uptime();
       router_reset_reachability();
-    }
-  }
-
-  /* Exit relays incorporate interface addresses in their exit policies when
-   * ExitPolicyRejectLocalInterfaces is set */
-  if (exit_reject_interfaces || (server && !at_interface)) {
+      /* All relays include their IP addresses as their ORPort addresses in
+       * their descriptor.
+       * Exit relays also incorporate interface addresses in their exit
+       * policies, when ExitPolicyRejectLocalInterfaces is set. */
       mark_my_descriptor_dirty("IP address changed");
     }
+  }
 
   dns_servers_relaunch_checks();
 }

src/core/mainloop/mainloop.h

@@ -56,7 +56,7 @@ MOCK_DECL(int, connection_count_moribund, (void));
 void directory_all_unreachable(time_t now);
 void directory_info_has_arrived(time_t now, int from_cache, int suppress_logs);
 
-void ip_address_changed(int at_interface);
+void ip_address_changed(int on_client_conn);
 void dns_servers_relaunch_checks(void);
 void reset_all_main_loop_timers(void);
 void reschedule_directory_downloads(void);