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/*
* Copyright (C) 2015 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 android.net.util;
import static android.system.OsConstants.SOL_SOCKET;
import static android.system.OsConstants.SO_BINDTODEVICE;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.SystemApi;
import android.system.ErrnoException;
import android.system.NetlinkSocketAddress;
import android.system.Os;
import android.system.PacketSocketAddress;
import com.android.internal.net.NetworkUtilsInternal;
import libcore.io.IoBridge;
import java.io.FileDescriptor;
import java.io.IOException;
import java.net.SocketAddress;
/**
* Collection of utilities to interact with raw sockets.
* @hide
*/
@SystemApi
public final class SocketUtils {
/**
* Create a raw datagram socket that is bound to an interface.
*
* <p>Data sent through the socket will go directly to the underlying network, ignoring VPNs.
*/
public static void bindSocketToInterface(@NonNull FileDescriptor socket, @NonNull String iface)
throws ErrnoException {
// SO_BINDTODEVICE actually takes a string. This works because the first member
// of struct ifreq is a NULL-terminated interface name.
// TODO: add a setsockoptString()
Os.setsockoptIfreq(socket, SOL_SOCKET, SO_BINDTODEVICE, iface);
NetworkUtilsInternal.protectFromVpn(socket);
}
/**
* Make a socket address to communicate with netlink.
*/
@NonNull
public static SocketAddress makeNetlinkSocketAddress(int portId, int groupsMask) {
return new NetlinkSocketAddress(portId, groupsMask);
}
/**
* Make socket address that packet sockets can bind to.
*
* @param protocol the layer 2 protocol of the packets to receive. One of the {@code ETH_P_*}
* constants in {@link android.system.OsConstants}.
* @param ifIndex the interface index on which packets will be received.
*/
@NonNull
public static SocketAddress makePacketSocketAddress(int protocol, int ifIndex) {
return new PacketSocketAddress(
protocol /* sll_protocol */,
ifIndex /* sll_ifindex */,
null /* sll_addr */);
}
/**
* Make a socket address that packet socket can send packets to.
* @deprecated Use {@link #makePacketSocketAddress(int, int, byte[])} instead.
*
* @param ifIndex the interface index on which packets will be sent.
* @param hwAddr the hardware address to which packets will be sent.
*/
@Deprecated
@NonNull
public static SocketAddress makePacketSocketAddress(int ifIndex, @NonNull byte[] hwAddr) {
return new PacketSocketAddress(
0 /* sll_protocol */,
ifIndex /* sll_ifindex */,
hwAddr /* sll_addr */);
}
/**
* Make a socket address that a packet socket can send packets to.
*
* @param protocol the layer 2 protocol of the packets to send. One of the {@code ETH_P_*}
* constants in {@link android.system.OsConstants}.
* @param ifIndex the interface index on which packets will be sent.
* @param hwAddr the hardware address to which packets will be sent.
*/
@NonNull
public static SocketAddress makePacketSocketAddress(int protocol, int ifIndex,
@NonNull byte[] hwAddr) {
return new PacketSocketAddress(
protocol /* sll_protocol */,
ifIndex /* sll_ifindex */,
hwAddr /* sll_addr */);
}
/**
* @see IoBridge#closeAndSignalBlockedThreads(FileDescriptor)
*/
public static void closeSocket(@Nullable FileDescriptor fd) throws IOException {
IoBridge.closeAndSignalBlockedThreads(fd);
}
private SocketUtils() {}
}
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