From 515925a0f0d8c6b6e5f7a5f116d5cc43efe1eb4e Mon Sep 17 00:00:00 2001
From: Nick Mathewson <nickm@torproject.org>
Date: Tue, 21 Sep 2004 18:12:12 +0000
Subject: [PATCH] Attach dummy resolve connections to a circuit *before*
 calling dns_resolve().  This fixes a bug where cached answers would never be
 sent in RESOLVED cells.

svn:r2360
---
 trunk/src/or/connection_edge.c | 14 ++++++--------
 trunk/src/or/dns.c             |  2 ++
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/trunk/src/or/connection_edge.c b/trunk/src/or/connection_edge.c
index e6b02257fd..d1bf109f22 100644
--- a/trunk/src/or/connection_edge.c
+++ b/trunk/src/or/connection_edge.c
@@ -855,19 +855,17 @@ int connection_exit_begin_resolve(cell_t *cell, circuit_t *circ) {
   dummy_conn->state = EXIT_CONN_STATE_RESOLVEFAILED;
   dummy_conn->purpose = EXIT_PURPOSE_RESOLVE;
 
+  dummy_conn->next_stream = circ->resolving_streams;
+  circ->resolving_streams = dummy_conn;
+
   /* send it off to the gethostbyname farm */
   switch(dns_resolve(dummy_conn)) {
-    case 1: /* resolve worked; resolved cell was sent. */
+    case 1: /* The result was cached; a resolved cell was sent. */
+    case -1: 
+      circuit_detach_stream(circuit_get_by_conn(dummy_conn), dummy_conn);
       connection_free(dummy_conn);
       return 0;
-    case -1: /* resolve failed; resolved cell was sent. */
-      log_fn(LOG_INFO,"Resolve failed (%s).",dummy_conn->address);
-      connection_free(dummy_conn);
-      break;
     case 0: /* resolve added to pending list */
-      /* add it into the linked list of resolving_streams on this circuit */
-      dummy_conn->next_stream = circ->resolving_streams;
-      circ->resolving_streams = dummy_conn;
       assert_circuit_ok(circ);
       ;
   }
diff --git a/trunk/src/or/dns.c b/trunk/src/or/dns.c
index 3534de1b08..0e583c0844 100644
--- a/trunk/src/or/dns.c
+++ b/trunk/src/or/dns.c
@@ -225,6 +225,8 @@ int dns_resolve(connection_t *exitconn) {
           send_resolved_cell(exitconn, RESOLVED_TYPE_IPV4);
         return 1;
       case CACHE_STATE_FAILED:
+        log_fn(LOG_DEBUG,"Connection (fd %d) found cached error for '%s'",
+               exitconn->s, exitconn->address);
         if (exitconn->purpose == EXIT_PURPOSE_RESOLVE)
           send_resolved_cell(exitconn, RESOLVED_TYPE_ERROR);
         return -1;