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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 androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import java.nio.ByteBuffer;
/**
* struct inet_diag_msg
*
* see <linux_src>/include/uapi/linux/inet_diag.h
*
* struct inet_diag_msg {
* __u8 idiag_family;
* __u8 idiag_state;
* __u8 idiag_timer;
* __u8 idiag_retrans;
* struct inet_diag_sockid id;
* __u32 idiag_expires;
* __u32 idiag_rqueue;
* __u32 idiag_wqueue;
* __u32 idiag_uid;
* __u32 idiag_inode;
* };
*
* @hide
*/
public class StructInetDiagMsg {
public static final int STRUCT_SIZE = 4 + StructInetDiagSockId.STRUCT_SIZE + 20;
public short idiag_family;
public short idiag_state;
public short idiag_timer;
public short idiag_retrans;
@NonNull
public StructInetDiagSockId id;
public long idiag_expires;
public long idiag_rqueue;
public long idiag_wqueue;
// Use int for uid since other code use int for uid and uid fits to int
public int idiag_uid;
public long idiag_inode;
private static short unsignedByte(byte b) {
return (short) (b & 0xFF);
}
/**
* Parse inet diag netlink message from buffer.
*/
@Nullable
public static StructInetDiagMsg parse(@NonNull ByteBuffer byteBuffer) {
if (byteBuffer.remaining() < STRUCT_SIZE) {
return null;
}
StructInetDiagMsg struct = new StructInetDiagMsg();
struct.idiag_family = unsignedByte(byteBuffer.get());
struct.idiag_state = unsignedByte(byteBuffer.get());
struct.idiag_timer = unsignedByte(byteBuffer.get());
struct.idiag_retrans = unsignedByte(byteBuffer.get());
struct.id = StructInetDiagSockId.parse(byteBuffer, struct.idiag_family);
if (struct.id == null) {
return null;
}
struct.idiag_expires = Integer.toUnsignedLong(byteBuffer.getInt());
struct.idiag_rqueue = Integer.toUnsignedLong(byteBuffer.getInt());
struct.idiag_wqueue = Integer.toUnsignedLong(byteBuffer.getInt());
struct.idiag_uid = byteBuffer.getInt();
struct.idiag_inode = Integer.toUnsignedLong(byteBuffer.getInt());
return struct;
}
@Override
public String toString() {
return "StructInetDiagMsg{ "
+ "idiag_family{" + idiag_family + "}, "
+ "idiag_state{" + idiag_state + "}, "
+ "idiag_timer{" + idiag_timer + "}, "
+ "idiag_retrans{" + idiag_retrans + "}, "
+ "id{" + id + "}, "
+ "idiag_expires{" + idiag_expires + "}, "
+ "idiag_rqueue{" + idiag_rqueue + "}, "
+ "idiag_wqueue{" + idiag_wqueue + "}, "
+ "idiag_uid{" + idiag_uid + "}, "
+ "idiag_inode{" + idiag_inode + "}, "
+ "}";
}
}
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