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Improve local vs. remote heuristics

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This commit is contained in:
Cameron Gutman 2017-12-27 21:43:12 -08:00
parent e3a2e40043
commit dc3495d59b
1 changed files with 24 additions and 4 deletions
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28
app/src/main/java/com/limelight/computers/ComputerManagerService.java
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@ -3,8 +3,10 @@ package com.limelight.computers;
import java.io.IOException;
import java.io.OutputStream;
import java.io.StringReader;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.LinkedList;
import java.util.List;
import java.util.UUID;
@ -500,14 +502,25 @@ public class ComputerManagerService extends Service {
return ComputerDetails.Reachability.OFFLINE;
}
private static boolean isAddressLikelyLocal(String str) {
try {
// This will tend to be wrong for IPv6 but falling back to
// remote will be fine in that case. For IPv4, it should be
// pretty accurate due to NAT prevalence.
return InetAddress.getByName(str).isSiteLocalAddress();
} catch (UnknownHostException e) {
e.printStackTrace();
return false;
}
}
private ReachabilityTuple pollForReachability(ComputerDetails details) throws InterruptedException {
ComputerDetails polledDetails;
ComputerDetails.Reachability reachability;
// If the local address is routable across the Internet,
// always consider this PC remote to be conservative
if (details.localAddress.equals(details.remoteAddress)) {
reachability = ComputerDetails.Reachability.REMOTE;
reachability = isAddressLikelyLocal(details.localAddress) ?
ComputerDetails.Reachability.LOCAL : ComputerDetails.Reachability.REMOTE;
}
else {
// Do a TCP-level connection to the HTTP server to see if it's listening
@ -553,7 +566,14 @@ public class ComputerManagerService extends Service {
return null;
}
if (polledDetails.remoteAddress.equals(reachableAddr)) {
// If both addresses are the same, guess whether we're local based on
// IP address heuristics.
if (reachableAddr.equals(polledDetails.localAddress) &&
reachableAddr.equals(polledDetails.remoteAddress)) {
polledDetails.reachability = isAddressLikelyLocal(reachableAddr) ?
ComputerDetails.Reachability.LOCAL : ComputerDetails.Reachability.REMOTE;
}
else if (polledDetails.remoteAddress.equals(reachableAddr)) {
polledDetails.reachability = ComputerDetails.Reachability.REMOTE;
}
else if (polledDetails.localAddress.equals(reachableAddr)) {