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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;
import android.net.MacAddress;
import android.text.TextUtils;
import java.net.NetworkInterface;
import java.net.SocketException;
/**
* Encapsulate the interface parameters common to IpClient/IpServer components.
*
* Basically all java.net.NetworkInterface methods throw Exceptions. IpClient
* and IpServer (sub)components need most or all of this information at some
* point during their lifecycles, so pass only this simplified object around
* which can be created once when IpClient/IpServer are told to start.
*
* @hide
*/
public class InterfaceParams {
public final String name;
public final int index;
public final boolean hasMacAddress;
public final MacAddress macAddr;
public final int defaultMtu;
// TODO: move the below to NetworkStackConstants when this class is moved to the NetworkStack.
private static final int ETHER_MTU = 1500;
private static final int IPV6_MIN_MTU = 1280;
/**
* Return InterfaceParams corresponding with an interface name
* @param name the interface name
*/
public static InterfaceParams getByName(String name) {
final NetworkInterface netif = getNetworkInterfaceByName(name);
if (netif == null) return null;
// Not all interfaces have MAC addresses, e.g. rmnet_data0.
final MacAddress macAddr = getMacAddress(netif);
try {
return new InterfaceParams(name, netif.getIndex(), macAddr, netif.getMTU());
} catch (IllegalArgumentException | SocketException e) {
return null;
}
}
public InterfaceParams(String name, int index, MacAddress macAddr) {
this(name, index, macAddr, ETHER_MTU);
}
public InterfaceParams(String name, int index, MacAddress macAddr, int defaultMtu) {
if (TextUtils.isEmpty(name)) {
throw new IllegalArgumentException("impossible interface name");
}
if (index <= 0) throw new IllegalArgumentException("invalid interface index");
this.name = name;
this.index = index;
this.hasMacAddress = (macAddr != null);
this.macAddr = hasMacAddress ? macAddr : MacAddress.fromBytes(new byte[] {
0x02, 0x00, 0x00, 0x00, 0x00, 0x00 });
this.defaultMtu = (defaultMtu > IPV6_MIN_MTU) ? defaultMtu : IPV6_MIN_MTU;
}
@Override
public String toString() {
return String.format("%s/%d/%s/%d", name, index, macAddr, defaultMtu);
}
private static NetworkInterface getNetworkInterfaceByName(String name) {
try {
return NetworkInterface.getByName(name);
} catch (NullPointerException | SocketException e) {
return null;
}
}
private static MacAddress getMacAddress(NetworkInterface netif) {
try {
return MacAddress.fromBytes(netif.getHardwareAddress());
} catch (IllegalArgumentException | NullPointerException | SocketException e) {
return null;
}
}
}
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