[or-cvs] r9669: Fix a bug found by Udo van den Heuvel: avoid an assertion fa (in tor/trunk: . src/or)

[nickm@xxxxxxxx]

Author: nickm
Date: 2007-02-27 19:23:05 -0500 (Tue, 27 Feb 2007)
New Revision: 9669

Modified:
   tor/trunk/
   tor/trunk/ChangeLog
   tor/trunk/src/or/circuitbuild.c
   tor/trunk/src/or/or.h
Log:
 r11970@catbus:  nickm | 2007-02-27 19:17:27 -0500
 Fix a bug found by Udo van den Heuvel: avoid an assertion failure when a controller sets and clears EntryNodes before the next call to choose_random_entry().  Also make a function static.



Property changes on: tor/trunk
___________________________________________________________________
 svk:merge ticket from /tor/trunk [r11970] on 8246c3cf-6607-4228-993b-4d95d33730f1

Modified: tor/trunk/ChangeLog
===================================================================
--- tor/trunk/ChangeLog	2007-02-27 19:02:37 UTC (rev 9668)
+++ tor/trunk/ChangeLog	2007-02-28 00:23:05 UTC (rev 9669)
@@ -7,7 +7,11 @@
     - Do not rotate onion key immediately after setting it for the first
       time.
 
+  o Minor bugfixes (other):
+    - Fix an assert that could trigger if a controller quickly set then
+      cleared EntryNodes.  (Bug found by Udo van den Heuvel.)
 
+
 Changes in version 0.1.2.8-beta - 2007-02-26
   o Major bugfixes (crashes):
     - Stop crashing when the controller asks us to resetconf more than

Modified: tor/trunk/src/or/circuitbuild.c
===================================================================
--- tor/trunk/src/or/circuitbuild.c	2007-02-27 19:02:37 UTC (rev 9668)
+++ tor/trunk/src/or/circuitbuild.c	2007-02-28 00:23:05 UTC (rev 9669)
@@ -2251,7 +2251,7 @@
 
 /** Add all nodes in EntryNodes that aren't currently guard nodes to the list
  * of guard nodes, at the front. */
-void
+static void
 entry_guards_prepend_from_config(void)
 {
   or_options_t *options = get_options();
@@ -2259,10 +2259,18 @@
   smartlist_t *old_entry_guards_on_list = smartlist_create();
   smartlist_t *old_entry_guards_not_on_list = smartlist_create();
   smartlist_t *entry_fps = smartlist_create();
-
   tor_assert(entry_guards);
-  tor_assert(options->EntryNodes);
 
+  should_add_entry_nodes = 0;
+
+  if (!options->EntryNodes) {
+    /* It's possible that a controller set EntryNodes, thus making
+     * should_add_entry_nodes set, then cleared it again, all before the
+     * call to choose_random_entry() that triggered us. If so, just return.
+     */
+    return;
+  }
+
   log_info(LD_CIRC,"Adding configured EntryNodes '%s'.",
            options->EntryNodes);
 
@@ -2300,7 +2308,6 @@
     smartlist_add_all(entry_guards, old_entry_guards_not_on_list);
   }
 
-  should_add_entry_nodes = 0;
   smartlist_free(entry_routers);
   smartlist_free(entry_fps);
   smartlist_free(old_entry_guards_on_list);

Modified: tor/trunk/src/or/or.h
===================================================================
--- tor/trunk/src/or/or.h	2007-02-27 19:02:37 UTC (rev 9668)
+++ tor/trunk/src/or/or.h	2007-02-28 00:23:05 UTC (rev 9669)
@@ -1980,7 +1980,6 @@
 int entry_guard_register_connect_status(const char *digest, int succeeded,
                                         time_t now);
 void entry_nodes_should_be_added(void);
-void entry_guards_prepend_from_config(void);
 void entry_guards_update_state(or_state_t *state);
 int entry_guards_parse_state(or_state_t *state, int set, char **msg);
 int getinfo_helper_entry_guards(control_connection_t *conn,