1473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline/* 2473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * Copyright (C) 2016 The Android Open Source Project 3473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * 4473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * Licensed under the Apache License, Version 2.0 (the "License"); 5473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * you may not use this file except in compliance with the License. 6473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * You may obtain a copy of the License at 7473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * 8473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * http://www.apache.org/licenses/LICENSE-2.0 9473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * 10473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * Unless required by applicable law or agreed to in writing, software 11473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * distributed under the License is distributed on an "AS IS" BASIS, 12473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * See the License for the specific language governing permissions and 14473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * limitations under the License. 15473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline */ 16473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline 17473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Klinepackage android.net.ip; 18473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline 19473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Klineimport static android.system.OsConstants.*; 20473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline 21473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Klineimport android.net.NetworkUtils; 2284714bffa1a58fe1f6a114ae015f8e38be46f32dErik Klineimport android.net.util.PacketReader; 23473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Klineimport android.net.util.ConnectivityPacketSummary; 248bd00d5f7ced34a45173e45537dc3100d62ee6a5Erik Klineimport android.net.util.InterfaceParams; 25473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Klineimport android.os.Handler; 26473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Klineimport android.system.ErrnoException; 27473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Klineimport android.system.Os; 28473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Klineimport android.system.PacketSocketAddress; 29e42502d2bb85b240a3d4e7ef29ad5a5d6413f29dErik Klineimport android.text.TextUtils; 30473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Klineimport android.util.Log; 31473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Klineimport android.util.LocalLog; 32473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline 33473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Klineimport libcore.io.IoBridge; 34473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Klineimport libcore.util.HexEncoding; 35473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline 36473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Klineimport java.io.FileDescriptor; 37473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Klineimport java.io.InterruptedIOException; 38473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Klineimport java.io.IOException; 39473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Klineimport java.net.SocketException; 40473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline 41473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline 42473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline/** 43473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * Critical connectivity packet tracking daemon. 44473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * 45473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * Tracks ARP, DHCPv4, and IPv6 RS/RA/NS/NA packets. 46473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * 47473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * This class's constructor, start() and stop() methods must only be called 48473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * from the same thread on which the passed in |log| is accessed. 49473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * 50473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * Log lines include a hexdump of the packet, which can be decoded via: 51473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * 52473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * echo -n H3XSTR1NG | sed -e 's/\([0-9A-F][0-9A-F]\)/\1 /g' -e 's/^/000000 /' 53473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * | text2pcap - - 54473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * | tcpdump -n -vv -e -r - 55473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * 56473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline * @hide 57473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline */ 58473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Klinepublic class ConnectivityPacketTracker { 59473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline private static final String TAG = ConnectivityPacketTracker.class.getSimpleName(); 60473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline private static final boolean DBG = false; 61473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline private static final String MARK_START = "--- START ---"; 62473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline private static final String MARK_STOP = "--- STOP ---"; 63e42502d2bb85b240a3d4e7ef29ad5a5d6413f29dErik Kline private static final String MARK_NAMED_START = "--- START (%s) ---"; 64e42502d2bb85b240a3d4e7ef29ad5a5d6413f29dErik Kline private static final String MARK_NAMED_STOP = "--- STOP (%s) ---"; 65473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline 66473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline private final String mTag; 67473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline private final LocalLog mLog; 6884714bffa1a58fe1f6a114ae015f8e38be46f32dErik Kline private final PacketReader mPacketListener; 69f840e07f821cb17c9ae1e6583a28eff548b90892Erik Kline private boolean mRunning; 70e42502d2bb85b240a3d4e7ef29ad5a5d6413f29dErik Kline private String mDisplayName; 71473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline 728bd00d5f7ced34a45173e45537dc3100d62ee6a5Erik Kline public ConnectivityPacketTracker(Handler h, InterfaceParams ifParams, LocalLog log) { 738bd00d5f7ced34a45173e45537dc3100d62ee6a5Erik Kline if (ifParams == null) throw new IllegalArgumentException("null InterfaceParams"); 74473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline 758bd00d5f7ced34a45173e45537dc3100d62ee6a5Erik Kline mTag = TAG + "." + ifParams.name; 76473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline mLog = log; 778bd00d5f7ced34a45173e45537dc3100d62ee6a5Erik Kline mPacketListener = new PacketListener(h, ifParams); 78473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline } 79473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline 80e42502d2bb85b240a3d4e7ef29ad5a5d6413f29dErik Kline public void start(String displayName) { 81f840e07f821cb17c9ae1e6583a28eff548b90892Erik Kline mRunning = true; 82e42502d2bb85b240a3d4e7ef29ad5a5d6413f29dErik Kline mDisplayName = displayName; 83473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline mPacketListener.start(); 84473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline } 85473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline 86473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline public void stop() { 87473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline mPacketListener.stop(); 88f840e07f821cb17c9ae1e6583a28eff548b90892Erik Kline mRunning = false; 89e42502d2bb85b240a3d4e7ef29ad5a5d6413f29dErik Kline mDisplayName = null; 90473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline } 91473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline 9284714bffa1a58fe1f6a114ae015f8e38be46f32dErik Kline private final class PacketListener extends PacketReader { 938bd00d5f7ced34a45173e45537dc3100d62ee6a5Erik Kline private final InterfaceParams mInterface; 94473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline 958bd00d5f7ced34a45173e45537dc3100d62ee6a5Erik Kline PacketListener(Handler h, InterfaceParams ifParams) { 968bd00d5f7ced34a45173e45537dc3100d62ee6a5Erik Kline super(h, ifParams.defaultMtu); 978bd00d5f7ced34a45173e45537dc3100d62ee6a5Erik Kline mInterface = ifParams; 98473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline } 99473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline 100473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline @Override 101f840e07f821cb17c9ae1e6583a28eff548b90892Erik Kline protected FileDescriptor createFd() { 102473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline FileDescriptor s = null; 103473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline try { 104473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline s = Os.socket(AF_PACKET, SOCK_RAW, 0); 105473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline NetworkUtils.attachControlPacketFilter(s, ARPHRD_ETHER); 1068bd00d5f7ced34a45173e45537dc3100d62ee6a5Erik Kline Os.bind(s, new PacketSocketAddress((short) ETH_P_ALL, mInterface.index)); 107473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline } catch (ErrnoException | IOException e) { 108473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline logError("Failed to create packet tracking socket: ", e); 109f840e07f821cb17c9ae1e6583a28eff548b90892Erik Kline closeFd(s); 110473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline return null; 111473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline } 112473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline return s; 113473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline } 114473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline 115473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline @Override 116473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline protected void handlePacket(byte[] recvbuf, int length) { 117473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline final String summary = ConnectivityPacketSummary.summarize( 1188bd00d5f7ced34a45173e45537dc3100d62ee6a5Erik Kline mInterface.macAddr, recvbuf, length); 119473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline if (summary == null) return; 120473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline 121473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline if (DBG) Log.d(mTag, summary); 122473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline addLogEntry(summary + 123473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline "\n[" + new String(HexEncoding.encode(recvbuf, 0, length)) + "]"); 124473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline } 125473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline 126473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline @Override 127f840e07f821cb17c9ae1e6583a28eff548b90892Erik Kline protected void onStart() { 128e42502d2bb85b240a3d4e7ef29ad5a5d6413f29dErik Kline final String msg = TextUtils.isEmpty(mDisplayName) 129e42502d2bb85b240a3d4e7ef29ad5a5d6413f29dErik Kline ? MARK_START 130e42502d2bb85b240a3d4e7ef29ad5a5d6413f29dErik Kline : String.format(MARK_NAMED_START, mDisplayName); 131e42502d2bb85b240a3d4e7ef29ad5a5d6413f29dErik Kline mLog.log(msg); 132f840e07f821cb17c9ae1e6583a28eff548b90892Erik Kline } 133f840e07f821cb17c9ae1e6583a28eff548b90892Erik Kline 134f840e07f821cb17c9ae1e6583a28eff548b90892Erik Kline @Override 135f840e07f821cb17c9ae1e6583a28eff548b90892Erik Kline protected void onStop() { 136e42502d2bb85b240a3d4e7ef29ad5a5d6413f29dErik Kline String msg = TextUtils.isEmpty(mDisplayName) 137e42502d2bb85b240a3d4e7ef29ad5a5d6413f29dErik Kline ? MARK_STOP 138e42502d2bb85b240a3d4e7ef29ad5a5d6413f29dErik Kline : String.format(MARK_NAMED_STOP, mDisplayName); 139e42502d2bb85b240a3d4e7ef29ad5a5d6413f29dErik Kline if (!mRunning) msg += " (packet listener stopped unexpectedly)"; 140e42502d2bb85b240a3d4e7ef29ad5a5d6413f29dErik Kline mLog.log(msg); 141f840e07f821cb17c9ae1e6583a28eff548b90892Erik Kline } 142f840e07f821cb17c9ae1e6583a28eff548b90892Erik Kline 143f840e07f821cb17c9ae1e6583a28eff548b90892Erik Kline @Override 144473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline protected void logError(String msg, Exception e) { 145473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline Log.e(mTag, msg, e); 146473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline addLogEntry(msg + e); 147473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline } 148473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline 149473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline private void addLogEntry(String entry) { 150f840e07f821cb17c9ae1e6583a28eff548b90892Erik Kline mLog.log(entry); 151473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline } 152473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline } 153473355f96b91a1fbeb6f8f8f0bcd3c887da12f40Erik Kline} 154