Networkstack: easy happy eyeball

This commit is contained in:
genofire 2019-11-19 14:41:47 +01:00
parent c437fb067b
commit 50456e3cac
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GPG Key ID: 9D7D3C6BFF600C6A
2 changed files with 216 additions and 105 deletions

View File

@ -7,8 +7,17 @@ import android.util.Log;
import java.io.IOException;
import java.lang.reflect.Field;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.List;
import de.measite.minidns.AbstractDNSClient;
@ -21,11 +30,15 @@ import de.measite.minidns.hla.DnssecResolverApi;
import de.measite.minidns.hla.ResolverApi;
import de.measite.minidns.hla.ResolverResult;
import de.measite.minidns.iterative.ReliableDNSClient;
import de.measite.minidns.record.A;
import de.measite.minidns.record.AAAA;
import de.measite.minidns.record.CNAME;
import de.measite.minidns.record.Data;
import de.measite.minidns.record.InternetAddressRR;
import de.measite.minidns.record.SRV;
import eu.siacs.conversations.Config;
import eu.siacs.conversations.R;
import eu.siacs.conversations.persistance.FileBackend;
import eu.siacs.conversations.services.XmppConnectionService;
public class Resolver {
@ -62,13 +75,13 @@ public class Resolver {
}
}
public static List<Result> fromHardCoded(String hostname, int port) {
Result result = new Result();
result.hostname = DNSName.from(hostname);
result.port = port;
result.directTls = useDirectTls(port);
result.authenticated = true;
return Collections.singletonList(result);
public static Result fromHardCoded(String hostname, int port) {
final Result ipResult = fromIpAddress(hostname, port);
if (ipResult != null) {
ipResult.connect();
return ipResult;
}
return happyEyeball(resolveNoSrvRecords(DNSName.from(hostname), port, true));
}
@ -76,10 +89,11 @@ public class Resolver {
return port == 443 || port == 5223;
}
public static List<Result> resolve(String domain) {
final List<Result> ipResults = fromIpAddress(domain);
if (ipResults.size() > 0) {
return ipResults;
public static Result resolve(String domain) {
final Result ipResult = fromIpAddress(domain, DEFAULT_PORT_XMPP);
if (ipResult != null) {
ipResult.connect();
return ipResult;
}
final List<Result> results = new ArrayList<>();
final List<Result> fallbackResults = new ArrayList<>();
@ -105,7 +119,7 @@ public class Resolver {
}
});
threads[2] = new Thread(() -> {
List<Result> list = resolveNoSrvRecords(DNSName.from(domain), true);
List<Result> list = resolveNoSrvRecords(DNSName.from(domain), DEFAULT_PORT_XMPP, true);
synchronized (fallbackResults) {
fallbackResults.addAll(list);
}
@ -121,63 +135,106 @@ public class Resolver {
synchronized (results) {
Collections.sort(results);
Log.d(Config.LOGTAG, Resolver.class.getSimpleName() + ": " + results.toString());
return new ArrayList<>(results);
return happyEyeball(results);
}
} else {
threads[2].join();
synchronized (fallbackResults) {
Collections.sort(fallbackResults);
Log.d(Config.LOGTAG, Resolver.class.getSimpleName() + ": " + fallbackResults.toString());
return new ArrayList<>(fallbackResults);
return happyEyeball(fallbackResults);
}
}
} catch (InterruptedException e) {
for (Thread thread : threads) {
thread.interrupt();
}
return Collections.emptyList();
return null;
}
}
private static List<Result> fromIpAddress(String domain) {
private static Result fromIpAddress(String domain, int port) {
if (!IP.matches(domain)) {
return Collections.emptyList();
return null;
}
try {
Result result = new Result();
result.ip = InetAddress.getByName(domain);
result.port = port;
return result;
} catch (UnknownHostException e) {
return null;
}
return Collections.singletonList(Result.createDefault(DNSName.from(domain)));
}
private static List<Result> resolveSrv(String domain, final boolean directTls) throws IOException {
DNSName dnsName = DNSName.from((directTls ? DIRECT_TLS_SERVICE : STARTTLS_SERVICE) + "._tcp." + domain);
ResolverResult<SRV> result = resolveWithFallback(dnsName, SRV.class);
final List<Result> results = new ArrayList<>();
final List<Thread> threads = new ArrayList<>();
for (SRV record : result.getAnswersOrEmptySet()) {
if (record.name.length() == 0 && record.priority == 0) {
continue;
}
Result resolverResult = Result.fromRecord(record, directTls);
resolverResult.authenticated = result.isAuthenticData();
results.add(resolverResult);
threads.add(new Thread(() -> {
final List<Result> ipv6s = resolveIp(record, AAAA.class, result.isAuthenticData(), directTls);
synchronized (results) {
results.addAll(ipv6s);
}
}));
threads.add(new Thread(() -> {
final List<Result> ipv4s = resolveIp(record, A.class, result.isAuthenticData(), directTls);
synchronized (results) {
results.addAll(ipv4s);
}
}));
}
for (Thread thread : threads) {
thread.start();
}
for (Thread thread : threads) {
try {
thread.join();
} catch (InterruptedException e) {
return Collections.emptyList();
}
}
return results;
}
private static List<Result> resolveNoSrvRecords(DNSName dnsName, boolean withCnames) {
List<Result> results = new ArrayList<>();
Boolean resolveCNAME = false;
private static <D extends InternetAddressRR> List<Result> resolveIp(SRV srv, Class<D> type, boolean authenticated, boolean directTls) {
List<Result> list = new ArrayList<>();
try {
if (withCnames) {
ResolverResult<D> results = resolveWithFallback(srv.name, type, authenticated);
for (D record : results.getAnswersOrEmptySet()) {
Result resolverResult = Result.fromRecord(srv, directTls);
resolverResult.authenticated = results.isAuthenticData() && authenticated;
resolverResult.ip = record.getInetAddress();
list.add(resolverResult);
}
} catch (Throwable t) {
Log.d(Config.LOGTAG, Resolver.class.getSimpleName() + ": error resolving " + type.getSimpleName() + " " + t.getMessage());
}
return list;
}
private static List<Result> resolveNoSrvRecords(DNSName dnsName, int port, boolean withCnames) {
List<Result> results = new ArrayList<>();
try {
for (AAAA aaaa : resolveWithFallback(dnsName, AAAA.class, false).getAnswersOrEmptySet()) {
results.add(Result.createDefault(dnsName, aaaa.getInetAddress(), port));
}
for (A a : resolveWithFallback(dnsName, A.class, false).getAnswersOrEmptySet()) {
results.add(Result.createDefault(dnsName, a.getInetAddress(), port));
}
if (results.size() == 0 && withCnames) {
for (CNAME cname : resolveWithFallback(dnsName, CNAME.class, false).getAnswersOrEmptySet()) {
results.addAll(resolveNoSrvRecords(cname.name, false));
resolveCNAME = true;
results.addAll(resolveNoSrvRecords(cname.name, port, false));
}
}
} catch (Throwable throwable) {
Log.d(Config.LOGTAG, Resolver.class.getSimpleName() + "error resolving fallback records", throwable);
}
if(!resolveCNAME) {
results.add(Result.createDefault(dnsName));
}
return results;
}
@ -202,22 +259,64 @@ public class Resolver {
return ResolverApi.INSTANCE.resolve(question);
}
private static Result happyEyeball(List<Result> r) {
if (r.size() == 0) return null;
Result result;
if (r.size() == 1) {
result = r.get(0);
result.connect();
return result;
}
ExecutorService executor = (ExecutorService) Executors.newFixedThreadPool(4);
try {
result = executor.invokeAny(r);
executor.shutdown();
Thread disconnector = new Thread(() -> {
while (true) {
try {
if (executor.awaitTermination(5, TimeUnit.SECONDS)) break;
Log.d(Config.LOGTAG, Resolver.class.getSimpleName() + ": happy eyeball wait for cleanup ...");
} catch (InterruptedException e) {}
}
Log.i(Config.LOGTAG, Resolver.class.getSimpleName() + ": happy eyeball cleanup");
for (Result re : r) {
if(!re.equals(result)) re.disconnect();
}
});
disconnector.start();
Log.i(Config.LOGTAG, Resolver.class.getSimpleName() + ": happy eyeball used: " + result.toString());
return result;
} catch (InterruptedException e) {
Log.e(Config.LOGTAG, Resolver.class.getSimpleName() + ": happy eyeball failed: ", e);
return null;
} catch (ExecutionException e) {
Log.e(Config.LOGTAG, Resolver.class.getSimpleName() + ": happy eyeball failed: ", e);
return null;
}
}
private static boolean validateHostname() {
return SERVICE != null && SERVICE.getBooleanPreference("validate_hostname", R.bool.validate_hostname);
}
public static class Result implements Comparable<Result> {
public static final String DOMAIN = "domain";
public static class Result implements Comparable<Result>, Callable<Result> {
public static final String IP = "ip";
public static final String HOSTNAME = "hostname";
public static final String PORT = "port";
public static final String PRIORITY = "priority";
public static final String DIRECT_TLS = "directTls";
public static final String AUTHENTICATED = "authenticated";
private InetAddress ip;
private DNSName hostname;
private int port = DEFAULT_PORT_XMPP;
private boolean directTls = false;
private boolean authenticated = false;
private int priority;
private Socket socket;
static Result fromRecord(SRV srv, boolean directTls) {
Result result = new Result();
@ -227,22 +326,12 @@ public class Resolver {
result.priority = srv.priority;
return result;
}
static Result createDefault(DNSName hostname) {
static Result createDefault(DNSName hostname, InetAddress ip, int port) {
Result result = new Result();
result.port = DEFAULT_PORT_XMPP;
result.port = port;
result.hostname = hostname;
return result;
}
public static Result fromCursor(Cursor cursor) {
final Result result = new Result();
final String hostname = cursor.getString(cursor.getColumnIndex(HOSTNAME));
result.hostname = hostname == null ? null : DNSName.from(hostname);
result.port = cursor.getInt(cursor.getColumnIndex(PORT));
result.priority = cursor.getInt(cursor.getColumnIndex(PRIORITY));
result.authenticated = cursor.getInt(cursor.getColumnIndex(AUTHENTICATED)) > 0;
result.directTls = cursor.getInt(cursor.getColumnIndex(DIRECT_TLS)) > 0;
result.ip = ip;
return result;
}
@ -257,12 +346,14 @@ public class Resolver {
if (directTls != result.directTls) return false;
if (authenticated != result.authenticated) return false;
if (priority != result.priority) return false;
if (ip != null ? !ip.equals(result.ip) : result.ip != null) return false;
return hostname != null ? hostname.equals(result.hostname) : result.hostname == null;
}
@Override
public int hashCode() {
int result = hostname != null ? hostname.hashCode() : 0;
int result = ip != null ? ip.hashCode() : 0;
result = 31 * result + (hostname != null ? hostname.hashCode() : 0);
result = 31 * result + port;
result = 31 * result + (directTls ? 1 : 0);
result = 31 * result + (authenticated ? 1 : 0);
@ -270,10 +361,6 @@ public class Resolver {
return result;
}
public int getPort() {
return port;
}
public DNSName getHostname() {
return hostname;
}
@ -286,9 +373,14 @@ public class Resolver {
return authenticated;
}
public Socket getSocket() {
return socket;
}
@Override
public String toString() {
return "Result{" +
"ip='" + (ip == null ? null : ip.getHostAddress()) + '\'' +
", hostame='" + hostname.toString() + '\'' +
", port=" + port +
", directTls=" + directTls +
@ -297,11 +389,35 @@ public class Resolver {
'}';
}
public void connect() {
if (this.socket != null) {
this.disconnect();
}
final InetSocketAddress addr = new InetSocketAddress(this.ip, this.port);
this.socket = new Socket();
try {
long time = System.currentTimeMillis();
this.socket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
time = System.currentTimeMillis() - time;
Log.d(Config.LOGTAG, Resolver.class.getSimpleName() + ": Result connect: " + toString() + " after: " + time + " ms");
} catch (IOException e) {
this.disconnect();
}
}
public void disconnect() {
if (this.socket != null ) {
FileBackend.close(this.socket);
this.socket = null;
Log.d(Config.LOGTAG, Resolver.class.getSimpleName() + ": Result disconnect: " + toString());
}
}
@Override
public int compareTo(@NonNull Result result) {
if (result.priority == priority) {
if (directTls == result.directTls) {
return 0;
return 0;
} else {
return directTls ? -1 : 1;
}
@ -309,9 +425,15 @@ public class Resolver {
return priority - result.priority;
}
}
@Override
public Result call() throws Exception {
this.connect();
return this.socket.isConnected() ? this : null;
}
public ContentValues toContentValues() {
final ContentValues contentValues = new ContentValues();
contentValues.put(IP, ip == null ? null : ip.getAddress());
contentValues.put(HOSTNAME, hostname == null ? null : hostname.toString());
contentValues.put(PORT, port);
contentValues.put(PRIORITY, priority);

View File

@ -290,65 +290,50 @@ public class XmppConnection implements Runnable {
}
} else {
final String domain = account.getJid().getDomain();
final List<Resolver.Result> results;
final Resolver.Result result;
final boolean hardcoded = extended && !account.getHostname().isEmpty();
if (hardcoded) {
results = Resolver.fromHardCoded(account.getHostname(), account.getPort());
result = Resolver.fromHardCoded(account.getHostname(), account.getPort());
} else {
results = Resolver.resolve(domain);
result = Resolver.resolve(domain);
}
if (result == null) {
throw new UnknownHostException();
}
if (Thread.currentThread().isInterrupted()) {
Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": Thread was interrupted");
return;
}
if (results.size() == 0) {
Log.e(Config.LOGTAG,account.getJid().asBareJid()+": Resolver results were empty");
try {
// if tls is true, encryption is implied and must not be started
features.encryptionEnabled = result.isDirectTls();
verifiedHostname = result.isAuthenticated() ? result.getHostname().toString() : null;
Log.d(Config.LOGTAG,"verified hostname " + verifiedHostname);
Log.d(Config.LOGTAG, account.getJid().asBareJid().toString()
+ ": using values from resolver " + result.toString());
localSocket = result.getSocket();
if (features.encryptionEnabled) {
localSocket = upgradeSocketToTls(localSocket);
}
localSocket.setSoTimeout(Config.SOCKET_TIMEOUT * 1000);
if (startXmpp(localSocket)) {
localSocket.setSoTimeout(0); //reset to 0; once the connection is established we dont want this
// successfully connected to server that speaks xmpp
} else {
FileBackend.close(localSocket);
throw new StateChangingException(Account.State.STREAM_OPENING_ERROR);
}
} catch (final StateChangingException e) {
throw e;
} catch (InterruptedException e) {
Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": thread was interrupted before beginning stream");
return;
}
for (Iterator<Resolver.Result> iterator = results.iterator(); iterator.hasNext(); ) {
final Resolver.Result result = iterator.next();
if (Thread.currentThread().isInterrupted()) {
Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": Thread was interrupted");
return;
}
try {
// if tls is true, encryption is implied and must not be started
features.encryptionEnabled = result.isDirectTls();
verifiedHostname = result.isAuthenticated() ? result.getHostname().toString() : null;
Log.d(Config.LOGTAG,"verified hostname "+verifiedHostname);
final InetSocketAddress addr = new InetSocketAddress(IDN.toASCII(result.getHostname().toString()), result.getPort());
Log.d(Config.LOGTAG, account.getJid().asBareJid().toString()
+ ": using values from resolver "
+ result.getHostname().toString() + ":" + result.getPort() + " tls: " + features.encryptionEnabled);
localSocket = new Socket();
localSocket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
if (features.encryptionEnabled) {
localSocket = upgradeSocketToTls(localSocket);
}
localSocket.setSoTimeout(Config.SOCKET_TIMEOUT * 1000);
if (startXmpp(localSocket)) {
localSocket.setSoTimeout(0); //reset to 0; once the connection is established we dont want this
break; // successfully connected to server that speaks xmpp
} else {
FileBackend.close(localSocket);
throw new StateChangingException(Account.State.STREAM_OPENING_ERROR);
}
} catch (final StateChangingException e) {
if (!iterator.hasNext()) {
throw e;
}
} catch (InterruptedException e) {
Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": thread was interrupted before beginning stream");
return;
} catch (final Throwable e) {
Log.d(Config.LOGTAG, account.getJid().asBareJid().toString() + ": " + e.getMessage() + "(" + e.getClass().getName() + ")");
if (!iterator.hasNext()) {
throw new UnknownHostException();
}
}
} catch (final Throwable e) {
Log.d(Config.LOGTAG, account.getJid().asBareJid().toString() + ": " + e.getMessage() + "(" + e.getClass().getName() + ")");
throw new UnknownHostException();
}
}
processStream();
@ -362,8 +347,12 @@ public class XmppConnection implements Runnable {
this.changeStatus(Account.State.SERVER_NOT_FOUND);
} catch (final SocksSocketFactory.SocksProxyNotFoundException e) {
this.changeStatus(Account.State.TOR_NOT_AVAILABLE);
} catch (final IOException | XmlPullParserException e) {
Log.d(Config.LOGTAG, account.getJid().asBareJid().toString() + ": " + e.getMessage());
} catch (final IOException e) {
Log.d(Config.LOGTAG, account.getJid().asBareJid().toString() + ": socket io :" + e.getMessage());
this.changeStatus(Account.State.OFFLINE);
this.attempt = Math.max(0, this.attempt - 1);
} catch (final XmlPullParserException e) {
Log.d(Config.LOGTAG, account.getJid().asBareJid().toString() + ": xml parser :" + e.getMessage());
this.changeStatus(Account.State.OFFLINE);
this.attempt = Math.max(0, this.attempt - 1);
} finally {