/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.net.util;
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import static android.system.OsConstants.SOL_SOCKET;
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import static android.system.OsConstants.SO_BINDTODEVICE;
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import android.annotation.NonNull;
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import android.annotation.Nullable;
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import android.annotation.SystemApi;
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import android.annotation.TestApi;
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import android.net.NetworkUtils;
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import android.system.ErrnoException;
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import android.system.NetlinkSocketAddress;
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import android.system.Os;
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import android.system.PacketSocketAddress;
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import libcore.io.IoBridge;
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import java.io.FileDescriptor;
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import java.io.IOException;
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import java.net.SocketAddress;
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/**
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* Collection of utilities to interact with raw sockets.
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* @hide
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*/
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@SystemApi
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@TestApi
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public final class SocketUtils {
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/**
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* Create a raw datagram socket that is bound to an interface.
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*
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* <p>Data sent through the socket will go directly to the underlying network, ignoring VPNs.
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*/
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public static void bindSocketToInterface(@NonNull FileDescriptor socket, @NonNull String iface)
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throws ErrnoException {
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// SO_BINDTODEVICE actually takes a string. This works because the first member
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// of struct ifreq is a NULL-terminated interface name.
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// TODO: add a setsockoptString()
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Os.setsockoptIfreq(socket, SOL_SOCKET, SO_BINDTODEVICE, iface);
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NetworkUtils.protectFromVpn(socket);
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}
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/**
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* Make a socket address to communicate with netlink.
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*/
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@NonNull
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public static SocketAddress makeNetlinkSocketAddress(int portId, int groupsMask) {
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return new NetlinkSocketAddress(portId, groupsMask);
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}
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/**
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* Make socket address that packet sockets can bind to.
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*/
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@NonNull
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public static SocketAddress makePacketSocketAddress(int protocol, int ifIndex) {
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return new PacketSocketAddress((short) protocol, ifIndex);
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}
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/**
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* Make a socket address that packet socket can send packets to.
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*/
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@NonNull
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public static SocketAddress makePacketSocketAddress(int ifIndex, @NonNull byte[] hwAddr) {
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return new PacketSocketAddress(ifIndex, hwAddr);
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}
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/**
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* @see IoBridge#closeAndSignalBlockedThreads(FileDescriptor)
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*/
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public static void closeSocket(@Nullable FileDescriptor fd) throws IOException {
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IoBridge.closeAndSignalBlockedThreads(fd);
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}
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private SocketUtils() {}
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}
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