Work in progress on refactoring root-topology into World and adding in-band updates.

node/Packet.hpp

@@ -564,6 +564,8 @@ public:
 		 *   <[2] software revision (of responder)>
 		 *   <[1] destination address type (for this OK, not copied from HELLO)>
 		 *   [<[...] destination address>]
+		 *   <[8] 64-bit world ID of current world>
+		 *   <[8] 64-bit timestamp of current world>
 		 *
 		 * ERROR has no payload.
 		 */
@@ -911,7 +913,7 @@ public:
 		 *
 		 * Path record flags:
 		 *   0x01 - Forget this path if it is currently known
-		 *   0x02 - Blacklist this path, do not use
+		 *   0x02 - (Unused)
 		 *   0x04 - Disable encryption (trust: privacy)
 		 *   0x08 - Disable encryption and authentication (trust: ultimate)
 		 *
@@ -1094,7 +1096,36 @@ public:
 		 *
 		 * ERROR has no payload.
 		 */
-		VERB_REQUEST_PROOF_OF_WORK = 19
+		VERB_REQUEST_PROOF_OF_WORK = 19,
+
+		/**
+		 * Generic binary object access:
+		 *   <[8] 64-bit request ID>
+		 *   <[4] 32-bit index in blob to retrieve>
+		 *   <[2] 16-bit max length of block to retrieve>
+		 *   <[2] 16-bit length of blob identifier>
+		 *   <[...] blob identifier>
+		 *
+		 * This is used as a generic remote object retrieval mechanism. It returns
+		 * OK if the object is accessible, INVALID_REQUEST if the index is beyond
+		 * the size of the blob or another element is invalid, and OBJ_NOT_FOUND
+		 * if no blob with the given identifier is available.
+		 *
+		 * Blob identifiers follow a de facto path-like schema, with the following
+		 * names reserved:
+		 *   world - Current world definition (see World.hpp)
+		 *   updates.d/<any> - Software updates (not used yet, but reserved)
+		 *
+		 * OK payload:
+		 *   <[8] 64-bit request ID>
+		 *   <[4] 32-bit total length of blob>
+		 *   <[4] 32-bit index of this data in blob>
+		 *   <[...] data>
+		 *
+		 * ERROR payload:
+		 *   <[8] 64-bit request ID>
+		 */
+		VERB_GET_OBJECT = 20
 	};
 
 	/**