From 4d7a45410d37cbc8c5b836f68b2fb7ae277280e1 Mon Sep 17 00:00:00 2001
From: Christopher Baines <cb15g11@soton.ac.uk>
Date: Fri, 4 Apr 2014 00:50:52 +0100
Subject: Fix the path overlapping problem

Retry connecting to introduction points
---
 src/or/circuitbuild.c |  2 --
 src/or/rendservice.c  | 82 ++++++++++++++++++++++++++++++++++++++-------------
 2 files changed, 62 insertions(+), 22 deletions(-)

diff --git a/src/or/circuitbuild.c b/src/or/circuitbuild.c
index 5f0271777..0fd7a80cc 100644
--- a/src/or/circuitbuild.c
+++ b/src/or/circuitbuild.c
@@ -2162,9 +2162,7 @@ extend_info_free(extend_info_t *info)
 {
   if (!info)
     return;
-  log_debug(LD_REND, "calling crypto_pk_free");
   crypto_pk_free(info->onion_key);
-  log_debug(LD_REND, "calling tor_free");
   tor_free(info);
 }
 
diff --git a/src/or/rendservice.c b/src/or/rendservice.c
index 41b0a3b5d..b6d0fd38b 100644
--- a/src/or/rendservice.c
+++ b/src/or/rendservice.c
@@ -2433,6 +2433,19 @@ rend_service_intro_has_opened(origin_circuit_t *circuit)
                "circuit, but we already have enough. Redefining purpose to "
                "general; leaving as internal.");
 
+      /* Remove the introduction point from the service
+       */
+      {
+        rend_intro_point_t *intro = find_intro_point(circuit);
+
+        rend_service_note_removing_intro_point(service, intro);
+
+        smartlist_remove(service->intro_nodes, intro);
+        rend_intro_point_free(intro);
+
+        intro = NULL;
+      }
+
       circuit_change_purpose(TO_CIRCUIT(circuit), CIRCUIT_PURPOSE_C_GENERAL);
 
       {
@@ -3074,27 +3087,56 @@ rend_services_introduce(void)
 
       node = node_get_by_id(intro->extend_info->identity_digest);
       if (!node || !intro_circ) {
-        int removing_this_intro_point_changes_the_intro_point_set = 1;
-        log_info(LD_REND, "Giving up on %s as intro point for %s"
-                 " (circuit disappeared).",
-                 safe_str_client(extend_info_describe(intro->extend_info)),
-                 safe_str_client(service->service_id));
-        rend_service_note_removing_intro_point(service, intro);
-        if (intro->time_expiring != -1) {
-          log_info(LD_REND, "We were already expiring the intro point; "
-                   "no need to mark the HS descriptor as dirty over this.");
-          removing_this_intro_point_changes_the_intro_point_set = 0;
-        } else if (intro->listed_in_last_desc) {
-          log_info(LD_REND, "The intro point we are giving up on was "
-                   "included in the last published descriptor. "
-                   "Marking current descriptor as dirty.");
-          service->desc_is_dirty = now;
+        /* The introduction point could still be up, so attempt to reconnect
+         * before discounting it */
+
+        if (intro->unreachable_count >= 2) {
+          int removing_this_intro_point_changes_the_intro_point_set = 1;
+
+          log_info(LD_REND, "Giving up on %s as intro point for %s"
+                   " (circuit disappeared).",
+                   safe_str_client(extend_info_describe(intro->extend_info)),
+                   safe_str_client(service->service_id));
+
+          rend_service_note_removing_intro_point(service, intro);
+
+          if (intro->time_expiring != -1) {
+            log_info(LD_REND, "We were already expiring the intro point; "
+                     "no need to mark the HS descriptor as dirty over this.");
+            removing_this_intro_point_changes_the_intro_point_set = 0;
+          } else if (intro->listed_in_last_desc) {
+            log_info(LD_REND, "The intro point we are giving up on was "
+                     "included in the last published descriptor. "
+                     "Marking current descriptor as dirty.");
+            service->desc_is_dirty = now;
+          }
+
+          rend_intro_point_free(intro);
+          intro = NULL; /* SMARTLIST_DEL_CURRENT takes a name, not a value. */
+          SMARTLIST_DEL_CURRENT(service->intro_nodes, intro);
+          if (removing_this_intro_point_changes_the_intro_point_set)
+            intro_point_set_changed = 1;
+        } else {
+          if (intro->unreachable_count == 0) {
+            log_info(LD_REND, "Circuit to %s has disapeared",
+                     safe_str_client(extend_info_describe(intro->extend_info)));
+          }
+
+          intro->unreachable_count++;
+          log_info(LD_REND, "incremented unreachable_count for %s to %d)",
+                   safe_str_client(extend_info_describe(intro->extend_info)),
+                   intro->unreachable_count);
+
+          log_info(LD_REND, "launching another circuit to %s",
+                   safe_str_client(extend_info_describe(intro->extend_info)));
+
+          r = rend_service_launch_establish_intro(service, intro);
+          if (r<0) {
+            log_warn(LD_REND, "Error launching circuit to node %s for service %s.",
+                     safe_str_client(extend_info_describe(intro->extend_info)),
+                     safe_str_client(service->service_id));
+          }
         }
-        rend_intro_point_free(intro);
-        intro = NULL; /* SMARTLIST_DEL_CURRENT takes a name, not a value. */
-        SMARTLIST_DEL_CURRENT(service->intro_nodes, intro);
-        if (removing_this_intro_point_changes_the_intro_point_set)
-          intro_point_set_changed = 1;
       }
 
       if (intro != NULL && intro_point_should_expire_now(intro, now)) {
-- 
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