-add cancel API

1 files changed, 16 insertions, 4 deletions

diff --git a/src/dns/dnsstub.c b/src/dns/dnsstub.c
index 49254b8d6..687259feb 100644
--- a/src/dns/dnsstub.c
+++ b/src/dns/dnsstub.c
@@ -438,10 +438,11 @@ do_dns_read (struct GNUNET_DNSSTUB_RequestSocket *rs,
                        addrlen)) ||      
        (0 == GNUNET_TIME_absolute_get_remaining (rs->timeout).rel_value) )
       return GNUNET_NO;
-    rs->rc (rs->rc_cls,
-            rs,
-            dns,
-            r);
+    if (NULL != rs->rc)
+      rs->rc (rs->rc_cls,
+              rs,
+              dns,
+              r);
   }  
   return GNUNET_OK;
 }
@@ -492,6 +493,17 @@ read_response (void *cls,
 }
 
 
+/**
+ * Cancel DNS resolution.
+ *
+ * @param rs resolution to cancel
+ */
+void
+GNUNET_DNSSTUB_resolve_cancel (struct GNUNET_DNSSTUB_RequestSocket *rs)
+{
+  rs->rc = NULL;
+}
+
 
 /**
  * Start a DNS stub resolver.