- Add reverse resolution with limited functionality

3 files changed, 62 insertions, 0 deletions

diff --git a/src/include/gnunet_gns_service.h b/src/include/gnunet_gns_service.h
index 1d74408fc..8a1099444 100644
--- a/src/include/gnunet_gns_service.h
+++ b/src/include/gnunet_gns_service.h
@@ -94,6 +94,16 @@ typedef void (*GNUNET_GNS_LookupResultProcessor) (void *cls,
                                                   uint32_t rd_count,
                                                   const struct GNUNET_GNSRECORD_Data *rd);
 
+/**
+ * Iterator called on obtained result for a GNS lookup.
+ *
+ * @param cls closure
+ * @param rd_count number of records in @a rd
+ * @param rd the records in reply
+ */
+typedef void (*GNUNET_GNS_ReverseLookupResultProcessor) (void *cls,
+                                                  const char* name);
+
 
 /**
  * Options for the GNS lookup.
@@ -146,6 +156,23 @@ GNUNET_GNS_lookup (struct GNUNET_GNS_Handle *handle,
                    GNUNET_GNS_LookupResultProcessor proc,
                    void *proc_cls);
 
+/**
+ * Perform an asynchronous reverse lookup operation on the GNS.
+ *
+ * @param handle handle to the GNS service
+ * @param zone_key zone to find a name for
+ * @param root_key our zone
+ * @param proc processor to call on result
+ * @param proc_cls closure for @a proc
+ * @return handle to the request
+ */
+struct GNUNET_GNS_ReverseLookupRequest*
+GNUNET_GNS_reverse_lookup (struct GNUNET_GNS_Handle *handle,
+                           const struct GNUNET_CRYPTO_EcdsaPublicKey *zone_key,
+                           const struct GNUNET_CRYPTO_EcdsaPublicKey *root_key,
+                           GNUNET_GNS_ReverseLookupResultProcessor proc,
+                           void *proc_cls);
+
 
 /**
  * Cancel pending lookup request
diff --git a/src/include/gnunet_gnsrecord_lib.h b/src/include/gnunet_gnsrecord_lib.h
index b7920cbb8..985ae1f7a 100644
--- a/src/include/gnunet_gnsrecord_lib.h
+++ b/src/include/gnunet_gnsrecord_lib.h
@@ -108,6 +108,10 @@ extern "C"
  */
 #define GNUNET_GNSRECORD_TYPE_ID_TOKEN_METADATA 65546
 
+/**
+ * Record type for reverse lookups
+ */
+#define GNUNET_GNSRECORD_TYPE_REVERSE 65548
 
 /**
  * Flags that can be set for a record.
@@ -286,6 +290,27 @@ struct GNUNET_GNSRECORD_BoxRecord
 
 };
 
+/**
+ * Record type used internally to keep track of reverse mappings into a
+ * namespace.
+ * The record contains data related to PKEY delegations from other namespaces to
+ * the namespace the record belongs to.
+ * It is exclusively found under the label ``+''.
+ */
+struct GNUNET_GNSRECORD_ReverseRecord
+{
+  /**
+   * The public key of the namespace the is delegating to our namespace
+   */
+  struct GNUNET_CRYPTO_EcdsaPublicKey pkey;
+
+  /**
+   * The expiration time of the delegation
+   */
+  struct GNUNET_TIME_Absolute expiration;
+
+  /* followed by the name the delegator uses to refer to our namespace */
+};
 
 GNUNET_NETWORK_STRUCT_END
 
diff --git a/src/include/gnunet_protocols.h b/src/include/gnunet_protocols.h
index f9f6cbd9c..0da6780cb 100644
--- a/src/include/gnunet_protocols.h
+++ b/src/include/gnunet_protocols.h
@@ -1529,6 +1529,16 @@ extern "C"
  */
 #define GNUNET_MESSAGE_TYPE_GNS_LOOKUP_RESULT 501
 
+/**
+ * Reverse lookup
+ */
+#define GNUNET_MESSAGE_TYPE_GNS_REVERSE_LOOKUP 503
+
+/**
+ * Response to reverse lookup
+ */
+#define GNUNET_MESSAGE_TYPE_GNS_REVERSE_LOOKUP_RESULT 504
+
 
 /*******************************************************************************
  * CONSENSUS message types