/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.mount;
import java.util.List;
import org.apache.hadoop.nfs.NfsExports;
import org.apache.hadoop.oncrpc.RpcAcceptedReply;
import org.apache.hadoop.oncrpc.XDR;
import org.apache.hadoop.oncrpc.security.VerifierNone;
import org.apache.hadoop.oncrpc.security.RpcAuthInfo.AuthFlavor;
/**
* Helper class for sending MountResponse
*/
public class MountResponse {
public final static int MNT_OK = 0;
/** Hidden constructor */
private MountResponse() {
}
/** Response for RPC call {@link MountInterface.MNTPROC#MNT} */
public static XDR writeMNTResponse(int status, XDR xdr, int xid,
byte[] handle) {
RpcAcceptedReply.getAcceptInstance(xid, new VerifierNone()).write(xdr);
xdr.writeInt(status);
if (status == MNT_OK) {
xdr.writeVariableOpaque(handle);
// Only MountV3 returns a list of supported authFlavors
xdr.writeInt(1);
xdr.writeInt(AuthFlavor.AUTH_SYS.getValue());
}
return xdr;
}
/** Response for RPC call {@link MountInterface.MNTPROC#DUMP} */
public static XDR writeMountList(XDR xdr, int xid, List<MountEntry> mounts) {
RpcAcceptedReply.getAcceptInstance(xid, new VerifierNone()).write(xdr);
for (MountEntry mountEntry : mounts) {
xdr.writeBoolean(true); // Value follows yes
xdr.writeString(mountEntry.host());
xdr.writeString(mountEntry.path());
}
xdr.writeBoolean(false); // Value follows no
return xdr;
}
/** Response for RPC call {@link MountInterface.MNTPROC#EXPORT} */
public static XDR writeExportList(XDR xdr, int xid, List<String> exports,
List<NfsExports> hostMatcher) {
assert (exports.size() == hostMatcher.size());
RpcAcceptedReply.getAcceptInstance(xid, new VerifierNone()).write(xdr);
for (int i = 0; i < exports.size(); i++) {
xdr.writeBoolean(true); // Value follows - yes
xdr.writeString(exports.get(i));
// List host groups
String[] hostGroups = hostMatcher.get(i).getHostGroupList();
if (hostGroups.length > 0) {
for (int j = 0; j < hostGroups.length; j++) {
xdr.writeBoolean(true); // Value follows - yes
xdr.writeVariableOpaque(hostGroups[j].getBytes());
}
}
xdr.writeBoolean(false); // Value follows - no more group
}
xdr.writeBoolean(false); // Value follows - no
return xdr;
}
}