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/*
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed 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 com.android.net.module.util.netlink;
import java.nio.ByteBuffer;
/**
* struct nlmsgerr
*
* see <linux_src>/include/uapi/linux/netlink.h
*
* @hide
*/
public class StructNlMsgErr {
public static final int STRUCT_SIZE = Integer.BYTES + StructNlMsgHdr.STRUCT_SIZE;
private static boolean hasAvailableSpace(ByteBuffer byteBuffer) {
return byteBuffer != null && byteBuffer.remaining() >= STRUCT_SIZE;
}
/**
* Parse a netlink error message payload from a {@link ByteBuffer}.
*
* @param byteBuffer The buffer from which to parse the netlink error message payload.
* @return the parsed netlink error message payload, or {@code null} if the netlink error
* message payload could not be parsed successfully (for example, if it was truncated).
*/
public static StructNlMsgErr parse(ByteBuffer byteBuffer) {
if (!hasAvailableSpace(byteBuffer)) return null;
// The ByteOrder must have already been set by the caller. In most
// cases ByteOrder.nativeOrder() is correct, with the exception
// of usage within unittests.
final StructNlMsgErr struct = new StructNlMsgErr();
struct.error = byteBuffer.getInt();
struct.msg = StructNlMsgHdr.parse(byteBuffer);
return struct;
}
public int error;
public StructNlMsgHdr msg;
/**
* Write the netlink error message payload to {@link ByteBuffer}.
*/
public void pack(ByteBuffer byteBuffer) {
// The ByteOrder must have already been set by the caller. In most
// cases ByteOrder.nativeOrder() is correct, with the possible
// exception of usage within unittests.
byteBuffer.putInt(error);
if (msg != null) {
msg.pack(byteBuffer);
}
}
@Override
public String toString() {
return "StructNlMsgErr{ "
+ "error{" + error + "}, "
+ "msg{" + (msg == null ? "" : msg.toString()) + "} "
+ "}";
}
}
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