1 files changed, 55 insertions, 13 deletions

diff --git a/src/gns/gns_api.c b/src/gns/gns_api.c
index 4a4003b2a..0d99d822e 100644
--- a/src/gns/gns_api.c
+++ b/src/gns/gns_api.c
@@ -1,6 +1,6 @@
 /*
      This file is part of GNUnet.
-     Copyright (C) 2009-2013, 2016, 2018 GNUnet e.V.
+     Copyright (C) 2009-2020 GNUnet e.V.
 
      GNUnet is free software: you can redistribute it and/or modify it
      under the terms of the GNU Affero General Public License as published
@@ -37,6 +37,12 @@
 #define LOG(kind, ...) GNUNET_log_from (kind, "gns-api", __VA_ARGS__)
 
 /**
+ * Default recursion depth limit to apply if
+ * the application does not specify any.
+ */
+#define DEFAULT_LIMIT 128
+
+/**
  * Handle to a lookup request
  */
 struct GNUNET_GNS_LookupRequest
@@ -325,21 +331,24 @@ GNUNET_GNS_lookup_cancel (struct GNUNET_GNS_LookupRequest *lr)
  *
  * @param handle handle to the GNS service
  * @param name the name to look up (in UTF-8 encoding)
- * @param zone the zone to start the resolution in
- * @param type the record type to look up
+ * @param zone zone to look in
+ * @param type the GNS record type to look for
  * @param options local options for the lookup
- * @param proc processor to call on result
+ * @param recursion_depth_limit maximum number of zones
+ *        that the lookup may (still) traverse
+ * @param proc function to call on result
  * @param proc_cls closure for @a proc
- * @return handle to the get request
+ * @return handle to the queued request
  */
-struct GNUNET_GNS_LookupRequest*
-GNUNET_GNS_lookup (struct GNUNET_GNS_Handle *handle,
-                   const char *name,
-                   const struct GNUNET_CRYPTO_EcdsaPublicKey *zone,
-                   uint32_t type,
-                   enum GNUNET_GNS_LocalOptions options,
-                   GNUNET_GNS_LookupResultProcessor proc,
-                   void *proc_cls)
+struct GNUNET_GNS_LookupRequest *
+GNUNET_GNS_lookup_limited (struct GNUNET_GNS_Handle *handle,
+                           const char *name,
+                           const struct GNUNET_CRYPTO_EcdsaPublicKey *zone,
+                           uint32_t type,
+                           enum GNUNET_GNS_LocalOptions options,
+                           uint16_t recursion_depth_limit,
+                           GNUNET_GNS_LookupResultProcessor proc,
+                           void *proc_cls)
 {
   /* IPC to shorten gns names, return shorten_handle */
   struct LookupMessage *lookup_msg;
@@ -370,6 +379,8 @@ GNUNET_GNS_lookup (struct GNUNET_GNS_Handle *handle,
                                  GNUNET_MESSAGE_TYPE_GNS_LOOKUP);
   lookup_msg->id = htonl (lr->r_id);
   lookup_msg->options = htons ((uint16_t) options);
+  lookup_msg->recursion_depth_limit
+    = htons (recursion_depth_limit);
   lookup_msg->zone = *zone;
   lookup_msg->type = htonl (type);
   GNUNET_memcpy (&lookup_msg[1],
@@ -385,4 +396,35 @@ GNUNET_GNS_lookup (struct GNUNET_GNS_Handle *handle,
 }
 
 
+/**
+ * Perform an asynchronous lookup operation on the GNS.
+ *
+ * @param handle handle to the GNS service
+ * @param name the name to look up (in UTF-8 encoding)
+ * @param zone the zone to start the resolution in
+ * @param type the record type to look up
+ * @param options local options for the lookup
+ * @param proc processor to call on result
+ * @param proc_cls closure for @a proc
+ * @return handle to the get request
+ */
+struct GNUNET_GNS_LookupRequest*
+GNUNET_GNS_lookup (struct GNUNET_GNS_Handle *handle,
+                   const char *name,
+                   const struct GNUNET_CRYPTO_EcdsaPublicKey *zone,
+                   uint32_t type,
+                   enum GNUNET_GNS_LocalOptions options,
+                   GNUNET_GNS_LookupResultProcessor proc,
+                   void *proc_cls)
+{
+  return GNUNET_GNS_lookup_limited (handle,
+                                    name,
+                                    zone,
+                                    type,
+                                    options,
+                                    DEFAULT_LIMIT,
+                                    proc,
+                                    proc_cls);
+}
+
 /* end of gns_api.c */