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Merge "Remove ArpPeer; dead code from Google TV."

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Elliott Hughes
2013-09-11 23:48:34 +00:00
committed by Gerrit Code Review
parent 90e42717e5 62d7bf2ab3
commit c3415a918d
1 changed files with 0 additions and 174 deletions
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174
core/java/android/net/arp/ArpPeer.java
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@@ -1,174 +0,0 @@
/*
* Copyright (C) 2012 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.arp;
import android.net.LinkAddress;
import android.net.LinkProperties;
import android.net.RouteInfo;
import android.os.SystemClock;
import android.util.Log;
import java.io.IOException;
import java.net.InetAddress;
import java.net.Inet6Address;
import java.net.SocketException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.Arrays;
import libcore.net.RawSocket;
/**
* This class allows simple ARP exchanges over an uninitialized network
* interface.
*
* @hide
*/
public class ArpPeer {
private static final boolean DBG = false;
private static final String TAG = "ArpPeer";
private String mInterfaceName;
private final InetAddress mMyAddr;
private final byte[] mMyMac = new byte[6];
private final InetAddress mPeer;
private final RawSocket mSocket;
private final byte[] L2_BROADCAST; // TODO: refactor from DhcpClient.java
private static final int MAX_LENGTH = 1500; // refactor from DhcpPacket.java
private static final int ETHERNET_TYPE = 1;
private static final int ARP_LENGTH = 28;
private static final int MAC_ADDR_LENGTH = 6;
private static final int IPV4_LENGTH = 4;
public ArpPeer(String interfaceName, InetAddress myAddr, String mac,
InetAddress peer) throws SocketException {
mInterfaceName = interfaceName;
mMyAddr = myAddr;
if (mac != null) {
for (int i = 0; i < MAC_ADDR_LENGTH; i++) {
mMyMac[i] = (byte) Integer.parseInt(mac.substring(
i*3, (i*3) + 2), 16);
}
}
if (myAddr instanceof Inet6Address || peer instanceof Inet6Address) {
throw new IllegalArgumentException("IPv6 unsupported");
}
mPeer = peer;
L2_BROADCAST = new byte[MAC_ADDR_LENGTH];
Arrays.fill(L2_BROADCAST, (byte) 0xFF);
mSocket = new RawSocket(mInterfaceName, RawSocket.ETH_P_ARP);
}
/**
* Returns the MAC address (or null if timeout) for the requested
* peer.
*/
public byte[] doArp(int timeoutMillis) {
ByteBuffer buf = ByteBuffer.allocate(MAX_LENGTH);
byte[] desiredIp = mPeer.getAddress();
long timeout = SystemClock.elapsedRealtime() + timeoutMillis;
// construct ARP request packet, using a ByteBuffer as a
// convenient container
buf.clear();
buf.order(ByteOrder.BIG_ENDIAN);
buf.putShort((short) ETHERNET_TYPE); // Ethernet type, 16 bits
buf.putShort(RawSocket.ETH_P_IP); // Protocol type IP, 16 bits
buf.put((byte)MAC_ADDR_LENGTH); // MAC address length, 6 bytes
buf.put((byte)IPV4_LENGTH); // IPv4 protocol size
buf.putShort((short) 1); // ARP opcode 1: 'request'
buf.put(mMyMac); // six bytes: sender MAC
buf.put(mMyAddr.getAddress()); // four bytes: sender IP address
buf.put(new byte[MAC_ADDR_LENGTH]); // target MAC address: unknown
buf.put(desiredIp); // target IP address, 4 bytes
buf.flip();
mSocket.write(L2_BROADCAST, buf.array(), 0, buf.limit());
byte[] recvBuf = new byte[MAX_LENGTH];
while (SystemClock.elapsedRealtime() < timeout) {
long duration = (long) timeout - SystemClock.elapsedRealtime();
int readLen = mSocket.read(recvBuf, 0, recvBuf.length, -1,
(int) duration);
// Verify packet details. see RFC 826
if ((readLen >= ARP_LENGTH) // trailing bytes at times
&& (recvBuf[0] == 0) && (recvBuf[1] == ETHERNET_TYPE) // type Ethernet
&& (recvBuf[2] == 8) && (recvBuf[3] == 0) // protocol IP
&& (recvBuf[4] == MAC_ADDR_LENGTH) // mac length
&& (recvBuf[5] == IPV4_LENGTH) // IPv4 protocol size
&& (recvBuf[6] == 0) && (recvBuf[7] == 2) // ARP reply
// verify desired IP address
&& (recvBuf[14] == desiredIp[0]) && (recvBuf[15] == desiredIp[1])
&& (recvBuf[16] == desiredIp[2]) && (recvBuf[17] == desiredIp[3]))
{
// looks good. copy out the MAC
byte[] result = new byte[MAC_ADDR_LENGTH];
System.arraycopy(recvBuf, 8, result, 0, MAC_ADDR_LENGTH);
return result;
}
}
return null;
}
public static boolean doArp(String myMacAddress, LinkProperties linkProperties,
int timeoutMillis, int numArpPings, int minArpResponses) {
String interfaceName = linkProperties.getInterfaceName();
InetAddress inetAddress = null;
InetAddress gateway = null;
boolean success;
for (LinkAddress la : linkProperties.getLinkAddresses()) {
inetAddress = la.getAddress();
break;
}
for (RouteInfo route : linkProperties.getRoutes()) {
gateway = route.getGateway();
break;
}
try {
ArpPeer peer = new ArpPeer(interfaceName, inetAddress, myMacAddress, gateway);
int responses = 0;
for (int i=0; i < numArpPings; i++) {
if(peer.doArp(timeoutMillis) != null) responses++;
}
if (DBG) Log.d(TAG, "ARP test result: " + responses + "/" + numArpPings);
success = (responses >= minArpResponses);
peer.close();
} catch (SocketException se) {
//Consider an Arp socket creation issue as a successful Arp
//test to avoid any wifi connectivity issues
Log.e(TAG, "ARP test initiation failure: " + se);
success = true;
}
return success;
}
public void close() {
try {
mSocket.close();
} catch (IOException ex) {
}
}
}