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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 okhttp3.internal.io;
import java.io.IOException;
import java.lang.ref.Reference;
import java.net.ConnectException;
import java.net.Proxy;
import java.net.Socket;
import java.net.SocketTimeoutException;
import java.net.UnknownServiceException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;
import javax.net.ssl.SSLPeerUnverifiedException;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import okhttp3.Address;
import okhttp3.CertificatePinner;
import okhttp3.Connection;
import okhttp3.ConnectionSpec;
import okhttp3.Handshake;
import okhttp3.HttpUrl;
import okhttp3.Protocol;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.Route;
import okhttp3.internal.ConnectionSpecSelector;
import okhttp3.internal.Platform;
import okhttp3.internal.Util;
import okhttp3.internal.Version;
import okhttp3.internal.framed.ErrorCode;
import okhttp3.internal.framed.FramedConnection;
import okhttp3.internal.framed.FramedStream;
import okhttp3.internal.http.Http1xStream;
import okhttp3.internal.http.OkHeaders;
import okhttp3.internal.http.RouteException;
import okhttp3.internal.http.StreamAllocation;
import okhttp3.internal.tls.OkHostnameVerifier;
import okio.BufferedSink;
import okio.BufferedSource;
import okio.Okio;
import okio.Source;
import static java.net.HttpURLConnection.HTTP_OK;
import static java.net.HttpURLConnection.HTTP_PROXY_AUTH;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static okhttp3.internal.Util.closeQuietly;
public final class RealConnection extends FramedConnection.Listener implements Connection {
private final Route route;
/** The low-level TCP socket. */
private Socket rawSocket;
/**
* The application layer socket. Either an {@link SSLSocket} layered over {@link #rawSocket}, or
* {@link #rawSocket} itself if this connection does not use SSL.
*/
public Socket socket;
private Handshake handshake;
private Protocol protocol;
public volatile FramedConnection framedConnection;
public int successCount;
public BufferedSource source;
public BufferedSink sink;
public int allocationLimit;
public final List> allocations = new ArrayList<>();
public boolean noNewStreams;
public long idleAtNanos = Long.MAX_VALUE;
public RealConnection(Route route) {
this.route = route;
}
public void connect(int connectTimeout, int readTimeout, int writeTimeout,
List connectionSpecs, boolean connectionRetryEnabled) throws RouteException {
if (protocol != null) throw new IllegalStateException("already connected");
RouteException routeException = null;
ConnectionSpecSelector connectionSpecSelector = new ConnectionSpecSelector(connectionSpecs);
Proxy proxy = route.proxy();
Address address = route.address();
if (route.address().sslSocketFactory() == null
&& !connectionSpecs.contains(ConnectionSpec.CLEARTEXT)) {
throw new RouteException(new UnknownServiceException(
"CLEARTEXT communication not supported: " + connectionSpecs));
}
while (protocol == null) {
try {
rawSocket = proxy.type() == Proxy.Type.DIRECT || proxy.type() == Proxy.Type.HTTP
? address.socketFactory().createSocket()
: new Socket(proxy);
connectSocket(connectTimeout, readTimeout, writeTimeout, connectionSpecSelector);
} catch (IOException e) {
closeQuietly(socket);
closeQuietly(rawSocket);
socket = null;
rawSocket = null;
source = null;
sink = null;
handshake = null;
protocol = null;
if (routeException == null) {
routeException = new RouteException(e);
} else {
routeException.addConnectException(e);
}
if (!connectionRetryEnabled || !connectionSpecSelector.connectionFailed(e)) {
throw routeException;
}
}
}
}
/** Does all the work necessary to build a full HTTP or HTTPS connection on a raw socket. */
private void connectSocket(int connectTimeout, int readTimeout, int writeTimeout,
ConnectionSpecSelector connectionSpecSelector) throws IOException {
rawSocket.setSoTimeout(readTimeout);
try {
Platform.get().connectSocket(rawSocket, route.socketAddress(), connectTimeout);
} catch (ConnectException e) {
throw new ConnectException("Failed to connect to " + route.socketAddress());
}
source = Okio.buffer(Okio.source(rawSocket));
sink = Okio.buffer(Okio.sink(rawSocket));
if (route.address().sslSocketFactory() != null) {
connectTls(readTimeout, writeTimeout, connectionSpecSelector);
} else {
protocol = Protocol.HTTP_1_1;
socket = rawSocket;
}
if (protocol == Protocol.SPDY_3 || protocol == Protocol.HTTP_2) {
socket.setSoTimeout(0); // Framed connection timeouts are set per-stream.
FramedConnection framedConnection = new FramedConnection.Builder(true)
.socket(socket, route.address().url().host(), source, sink)
.protocol(protocol)
.listener(this)
.build();
framedConnection.sendConnectionPreface();
// Only assign the framed connection once the preface has been sent successfully.
this.allocationLimit = framedConnection.maxConcurrentStreams();
this.framedConnection = framedConnection;
} else {
this.allocationLimit = 1;
}
}
private void connectTls(int readTimeout, int writeTimeout,
ConnectionSpecSelector connectionSpecSelector) throws IOException {
if (route.requiresTunnel()) {
createTunnel(readTimeout, writeTimeout);
}
Address address = route.address();
SSLSocketFactory sslSocketFactory = address.sslSocketFactory();
boolean success = false;
SSLSocket sslSocket = null;
try {
// Create the wrapper over the connected socket.
sslSocket = (SSLSocket) sslSocketFactory.createSocket(
rawSocket, address.url().host(), address.url().port(), true /* autoClose */);
// Configure the socket's ciphers, TLS versions, and extensions.
ConnectionSpec connectionSpec = connectionSpecSelector.configureSecureSocket(sslSocket);
if (connectionSpec.supportsTlsExtensions()) {
Platform.get().configureTlsExtensions(
sslSocket, address.url().host(), address.protocols());
}
// Force handshake. This can throw!
sslSocket.startHandshake();
Handshake unverifiedHandshake = Handshake.get(sslSocket.getSession());
// Verify that the socket's certificates are acceptable for the target host.
if (!address.hostnameVerifier().verify(address.url().host(), sslSocket.getSession())) {
X509Certificate cert = (X509Certificate) unverifiedHandshake.peerCertificates().get(0);
throw new SSLPeerUnverifiedException("Hostname " + address.url().host() + " not verified:"
+ "\n certificate: " + CertificatePinner.pin(cert)
+ "\n DN: " + cert.getSubjectDN().getName()
+ "\n subjectAltNames: " + OkHostnameVerifier.allSubjectAltNames(cert));
}
// Check that the certificate pinner is satisfied by the certificates presented.
address.certificatePinner().check(address.url().host(),
unverifiedHandshake.peerCertificates());
// Success! Save the handshake and the ALPN protocol.
String maybeProtocol = connectionSpec.supportsTlsExtensions()
? Platform.get().getSelectedProtocol(sslSocket)
: null;
socket = sslSocket;
source = Okio.buffer(Okio.source(socket));
sink = Okio.buffer(Okio.sink(socket));
handshake = unverifiedHandshake;
protocol = maybeProtocol != null
? Protocol.get(maybeProtocol)
: Protocol.HTTP_1_1;
success = true;
} catch (AssertionError e) {
if (Util.isAndroidGetsocknameError(e)) throw new IOException(e);
throw e;
} finally {
if (sslSocket != null) {
Platform.get().afterHandshake(sslSocket);
}
if (!success) {
closeQuietly(sslSocket);
}
}
}
/**
* To make an HTTPS connection over an HTTP proxy, send an unencrypted CONNECT request to create
* the proxy connection. This may need to be retried if the proxy requires authorization.
*/
private void createTunnel(int readTimeout, int writeTimeout) throws IOException {
// Make an SSL Tunnel on the first message pair of each SSL + proxy connection.
Request tunnelRequest = createTunnelRequest();
HttpUrl url = tunnelRequest.url();
String requestLine = "CONNECT " + Util.hostHeader(url, true) + " HTTP/1.1";
while (true) {
Http1xStream tunnelConnection = new Http1xStream(null, source, sink);
source.timeout().timeout(readTimeout, MILLISECONDS);
sink.timeout().timeout(writeTimeout, MILLISECONDS);
tunnelConnection.writeRequest(tunnelRequest.headers(), requestLine);
tunnelConnection.finishRequest();
Response response = tunnelConnection.readResponse().request(tunnelRequest).build();
// The response body from a CONNECT should be empty, but if it is not then we should consume
// it before proceeding.
long contentLength = OkHeaders.contentLength(response);
if (contentLength == -1L) {
contentLength = 0L;
}
Source body = tunnelConnection.newFixedLengthSource(contentLength);
Util.skipAll(body, Integer.MAX_VALUE, TimeUnit.MILLISECONDS);
body.close();
switch (response.code()) {
case HTTP_OK:
// Assume the server won't send a TLS ServerHello until we send a TLS ClientHello. If
// that happens, then we will have buffered bytes that are needed by the SSLSocket!
// This check is imperfect: it doesn't tell us whether a handshake will succeed, just
// that it will almost certainly fail because the proxy has sent unexpected data.
if (!source.buffer().exhausted() || !sink.buffer().exhausted()) {
throw new IOException("TLS tunnel buffered too many bytes!");
}
return;
case HTTP_PROXY_AUTH:
tunnelRequest = route.address().proxyAuthenticator().authenticate(route, response);
if (tunnelRequest != null) continue;
throw new IOException("Failed to authenticate with proxy");
default:
throw new IOException(
"Unexpected response code for CONNECT: " + response.code());
}
}
}
/**
* Returns a request that creates a TLS tunnel via an HTTP proxy, or null if no tunnel is
* necessary. Everything in the tunnel request is sent unencrypted to the proxy server, so tunnels
* include only the minimum set of headers. This avoids sending potentially sensitive data like
* HTTP cookies to the proxy unencrypted.
*/
private Request createTunnelRequest() throws IOException {
return new Request.Builder()
.url(route.address().url())
.header("Host", Util.hostHeader(route.address().url(), true))
.header("Proxy-Connection", "Keep-Alive")
.header("User-Agent", Version.userAgent()) // For HTTP/1.0 proxies like Squid.
.build();
}
/** Returns true if {@link #connect} has been attempted on this connection. */
boolean isConnected() {
return protocol != null;
}
@Override public Route route() {
return route;
}
public void cancel() {
// Close the raw socket so we don't end up doing synchronous I/O.
closeQuietly(rawSocket);
}
@Override public Socket socket() {
return socket;
}
/** Returns true if this connection is ready to host new streams. */
public boolean isHealthy(boolean doExtensiveChecks) {
if (socket.isClosed() || socket.isInputShutdown() || socket.isOutputShutdown()) {
return false;
}
if (framedConnection != null) {
return true; // TODO: check framedConnection.shutdown.
}
if (doExtensiveChecks) {
try {
int readTimeout = socket.getSoTimeout();
try {
socket.setSoTimeout(1);
if (source.exhausted()) {
return false; // Stream is exhausted; socket is closed.
}
return true;
} finally {
socket.setSoTimeout(readTimeout);
}
} catch (SocketTimeoutException ignored) {
// Read timed out; socket is good.
} catch (IOException e) {
return false; // Couldn't read; socket is closed.
}
}
return true;
}
/** Refuse incoming streams. */
@Override public void onStream(FramedStream stream) throws IOException {
stream.close(ErrorCode.REFUSED_STREAM);
}
/** When settings are received, adjust the allocation limit. */
@Override public void onSettings(FramedConnection connection) {
allocationLimit = connection.maxConcurrentStreams();
}
@Override public Handshake handshake() {
return handshake;
}
/**
* Returns true if this is a SPDY connection. Such connections can be used in multiple HTTP
* requests simultaneously.
*/
public boolean isMultiplexed() {
return framedConnection != null;
}
@Override public Protocol protocol() {
if (framedConnection == null) {
return protocol != null ? protocol : Protocol.HTTP_1_1;
} else {
return framedConnection.getProtocol();
}
}
@Override public String toString() {
return "Connection{"
+ route.address().url().host() + ":" + route.address().url().port()
+ ", proxy="
+ route.proxy()
+ " hostAddress="
+ route.socketAddress()
+ " cipherSuite="
+ (handshake != null ? handshake.cipherSuite() : "none")
+ " protocol="
+ protocol
+ '}';
}
}
