nfs4: Make RPC::Reply decode RPC errors

src/add-ons/kernel/file_systems/nfs4/RPCReply.cpp

@@ -14,6 +14,29 @@
 
 using namespace RPC;
 
+enum {
+	REPLY	= 1
+};
+
+enum {
+	MSG_ACCEPTED	= 0,
+	MSG_DENIED		= 1
+};
+
+enum accept_stat {
+	SUCCESS       = 0, /* RPC executed successfully       */
+	PROG_UNAVAIL  = 1, /* remote hasn't exported program  */
+	PROG_MISMATCH = 2, /* remote can't support version #  */
+	PROC_UNAVAIL  = 3, /* program can't support procedure */
+	GARBAGE_ARGS  = 4, /* procedure can't decode params   */
+	SYSTEM_ERR    = 5  /* e.g. memory allocation failure  */
+};
+
+enum reject_stat {
+	RPC_MISMATCH = 0, /* RPC version number != 2          */
+	AUTH_ERROR = 1    /* remote can't authenticate caller */
+};
+
 
 Reply::Reply(void *buffer, int size)
 	:
@@ -22,12 +45,42 @@ Reply::Reply(void *buffer, int size)
 	fBuffer(buffer)
 {
 	fXID = fStream.GetUInt();
-#if 0
+	if (fStream.GetInt() != REPLY) {
-	int32 type = fStream.GetInt();
+		fError = B_BAD_VALUE;
-	int32 state = fStream.GetInt();
+		return;
-	int32 auth = fStream.GetInt();
+	}
+
+	if (fStream.GetInt() == MSG_ACCEPTED) {
+		fStream.GetInt();
 		fStream.GetOpaque(NULL);
-#endif
+
+		switch (fStream.GetInt()) {
+			case SUCCESS:
+				return;
+			case PROG_UNAVAIL:
+			case PROG_MISMATCH:
+			case PROC_UNAVAIL:
+				fError = B_DEVICE_NOT_FOUND;
+				return;
+			case GARBAGE_ARGS:
+				fError = B_MISMATCHED_VALUES;
+				return;
+			case SYSTEM_ERR:
+				fError = B_ERROR;
+				return;
+			default:
+				fError = B_BAD_VALUE;
+				return;
+		}
+	} else {		// MSG_DENIED
+		if (fStream.GetInt() == RPC_MISMATCH) {
+			fError = B_DEVICE_NOT_FOUND;
+			return;
+		} else {	// AUTH_ERROR	
+			fError = B_PERMISSION_DENIED;
+			return;
+		}
+	}
 }