| /* |
| * 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 com.squareup.okhttp; |
| |
| import com.squareup.okhttp.internal.Platform; |
| import com.squareup.okhttp.internal.http.HttpAuthenticator; |
| import com.squareup.okhttp.internal.http.HttpEngine; |
| import com.squareup.okhttp.internal.http.HttpTransport; |
| import com.squareup.okhttp.internal.http.RawHeaders; |
| import com.squareup.okhttp.internal.http.SpdyTransport; |
| import com.squareup.okhttp.internal.spdy.SpdyConnection; |
| import java.io.BufferedInputStream; |
| import java.io.BufferedOutputStream; |
| import java.io.Closeable; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.net.Proxy; |
| import java.net.Socket; |
| import java.net.URL; |
| import java.util.Arrays; |
| import javax.net.ssl.SSLSocket; |
| |
| import static java.net.HttpURLConnection.HTTP_OK; |
| import static java.net.HttpURLConnection.HTTP_PROXY_AUTH; |
| |
| /** |
| * Holds the sockets and streams of an HTTP, HTTPS, or HTTPS+SPDY connection, |
| * which may be used for multiple HTTP request/response exchanges. Connections |
| * may be direct to the origin server or via a proxy. |
| * |
| * <p>Typically instances of this class are created, connected and exercised |
| * automatically by the HTTP client. Applications may use this class to monitor |
| * HTTP connections as members of a {@link ConnectionPool connection pool}. |
| * |
| * <p>Do not confuse this class with the misnamed {@code HttpURLConnection}, |
| * which isn't so much a connection as a single request/response exchange. |
| * |
| * <h3>Modern TLS</h3> |
| * There are tradeoffs when selecting which options to include when negotiating |
| * a secure connection to a remote host. Newer TLS options are quite useful: |
| * <ul> |
| * <li>Server Name Indication (SNI) enables one IP address to negotiate secure |
| * connections for multiple domain names. |
| * <li>Next Protocol Negotiation (NPN) enables the HTTPS port (443) to be used |
| * for both HTTP and SPDY transports. |
| * </ul> |
| * Unfortunately, older HTTPS servers refuse to connect when such options are |
| * presented. Rather than avoiding these options entirely, this class allows a |
| * connection to be attempted with modern options and then retried without them |
| * should the attempt fail. |
| */ |
| public final class Connection implements Closeable { |
| private static final byte[] NPN_PROTOCOLS = new byte[] { |
| 6, 's', 'p', 'd', 'y', '/', '3', |
| 8, 'h', 't', 't', 'p', '/', '1', '.', '1' |
| }; |
| private static final byte[] SPDY3 = new byte[] { |
| 's', 'p', 'd', 'y', '/', '3' |
| }; |
| private static final byte[] HTTP_11 = new byte[] { |
| 'h', 't', 't', 'p', '/', '1', '.', '1' |
| }; |
| |
| private final Route route; |
| |
| private Socket socket; |
| private InputStream in; |
| private OutputStream out; |
| private boolean connected = false; |
| private SpdyConnection spdyConnection; |
| private int httpMinorVersion = 1; // Assume HTTP/1.1 |
| private long idleStartTimeNs; |
| |
| public Connection(Route route) { |
| this.route = route; |
| } |
| |
| public void connect(int connectTimeout, int readTimeout, TunnelRequest tunnelRequest) |
| throws IOException { |
| if (connected) { |
| throw new IllegalStateException("already connected"); |
| } |
| connected = true; |
| socket = (route.proxy.type() != Proxy.Type.HTTP) ? new Socket(route.proxy) : new Socket(); |
| socket.connect(route.inetSocketAddress, connectTimeout); |
| socket.setSoTimeout(readTimeout); |
| in = socket.getInputStream(); |
| out = socket.getOutputStream(); |
| |
| if (route.address.sslSocketFactory != null) { |
| upgradeToTls(tunnelRequest); |
| } |
| |
| // Use MTU-sized buffers to send fewer packets. |
| int mtu = Platform.get().getMtu(socket); |
| in = new BufferedInputStream(in, mtu); |
| out = new BufferedOutputStream(out, mtu); |
| } |
| |
| /** |
| * Create an {@code SSLSocket} and perform the TLS handshake and certificate |
| * validation. |
| */ |
| private void upgradeToTls(TunnelRequest tunnelRequest) throws IOException { |
| Platform platform = Platform.get(); |
| |
| // Make an SSL Tunnel on the first message pair of each SSL + proxy connection. |
| if (requiresTunnel()) { |
| makeTunnel(tunnelRequest); |
| } |
| |
| // Create the wrapper over connected socket. |
| socket = route.address.sslSocketFactory |
| .createSocket(socket, route.address.uriHost, route.address.uriPort, true /* autoClose */); |
| SSLSocket sslSocket = (SSLSocket) socket; |
| if (route.modernTls) { |
| platform.enableTlsExtensions(sslSocket, route.address.uriHost); |
| } else { |
| platform.supportTlsIntolerantServer(sslSocket); |
| } |
| |
| if (route.modernTls) { |
| platform.setNpnProtocols(sslSocket, NPN_PROTOCOLS); |
| } |
| |
| // Force handshake. This can throw! |
| sslSocket.startHandshake(); |
| |
| // Verify that the socket's certificates are acceptable for the target host. |
| if (!route.address.hostnameVerifier.verify(route.address.uriHost, sslSocket.getSession())) { |
| throw new IOException("Hostname '" + route.address.uriHost + "' was not verified"); |
| } |
| |
| out = sslSocket.getOutputStream(); |
| in = sslSocket.getInputStream(); |
| |
| byte[] selectedProtocol; |
| if (route.modernTls |
| && (selectedProtocol = platform.getNpnSelectedProtocol(sslSocket)) != null) { |
| if (Arrays.equals(selectedProtocol, SPDY3)) { |
| sslSocket.setSoTimeout(0); // SPDY timeouts are set per-stream. |
| spdyConnection = new SpdyConnection.Builder(route.address.getUriHost(), true, in, out) |
| .build(); |
| } else if (!Arrays.equals(selectedProtocol, HTTP_11)) { |
| throw new IOException( |
| "Unexpected NPN transport " + new String(selectedProtocol, "ISO-8859-1")); |
| } |
| } |
| } |
| |
| /** Returns true if {@link #connect} has been attempted on this connection. */ |
| public boolean isConnected() { |
| return connected; |
| } |
| |
| @Override public void close() throws IOException { |
| socket.close(); |
| } |
| |
| /** Returns the route used by this connection. */ |
| public Route getRoute() { |
| return route; |
| } |
| |
| /** |
| * Returns the socket that this connection uses, or null if the connection |
| * is not currently connected. |
| */ |
| public Socket getSocket() { |
| return socket; |
| } |
| |
| /** Returns true if this connection is alive. */ |
| public boolean isAlive() { |
| return !socket.isClosed() && !socket.isInputShutdown() && !socket.isOutputShutdown(); |
| } |
| |
| public void resetIdleStartTime() { |
| if (spdyConnection != null) { |
| throw new IllegalStateException("spdyConnection != null"); |
| } |
| this.idleStartTimeNs = System.nanoTime(); |
| } |
| |
| /** Returns true if this connection is idle. */ |
| public boolean isIdle() { |
| return spdyConnection == null || spdyConnection.isIdle(); |
| } |
| |
| /** |
| * Returns true if this connection has been idle for longer than |
| * {@code keepAliveDurationNs}. |
| */ |
| public boolean isExpired(long keepAliveDurationNs) { |
| return isIdle() && System.nanoTime() - getIdleStartTimeNs() > keepAliveDurationNs; |
| } |
| |
| /** |
| * Returns the time in ns when this connection became idle. Undefined if |
| * this connection is not idle. |
| */ |
| public long getIdleStartTimeNs() { |
| return spdyConnection == null ? idleStartTimeNs : spdyConnection.getIdleStartTimeNs(); |
| } |
| |
| /** Returns the transport appropriate for this connection. */ |
| public Object newTransport(HttpEngine httpEngine) throws IOException { |
| return (spdyConnection != null) ? new SpdyTransport(httpEngine, spdyConnection) |
| : new HttpTransport(httpEngine, out, in); |
| } |
| |
| /** |
| * Returns true if this is a SPDY connection. Such connections can be used |
| * in multiple HTTP requests simultaneously. |
| */ |
| public boolean isSpdy() { |
| return spdyConnection != null; |
| } |
| |
| public SpdyConnection getSpdyConnection() { |
| return spdyConnection; |
| } |
| |
| /** |
| * Returns the minor HTTP version that should be used for future requests on |
| * this connection. Either 0 for HTTP/1.0, or 1 for HTTP/1.1. The default |
| * value is 1 for new connections. |
| */ |
| public int getHttpMinorVersion() { |
| return httpMinorVersion; |
| } |
| |
| public void setHttpMinorVersion(int httpMinorVersion) { |
| this.httpMinorVersion = httpMinorVersion; |
| } |
| |
| /** |
| * Returns true if the HTTP connection needs to tunnel one protocol over |
| * another, such as when using HTTPS through an HTTP proxy. When doing so, |
| * we must avoid buffering bytes intended for the higher-level protocol. |
| */ |
| public boolean requiresTunnel() { |
| return route.address.sslSocketFactory != null && route.proxy.type() == Proxy.Type.HTTP; |
| } |
| |
| /** |
| * 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 makeTunnel(TunnelRequest tunnelRequest) throws IOException { |
| RawHeaders requestHeaders = tunnelRequest.getRequestHeaders(); |
| while (true) { |
| out.write(requestHeaders.toBytes()); |
| RawHeaders responseHeaders = RawHeaders.fromBytes(in); |
| |
| switch (responseHeaders.getResponseCode()) { |
| case HTTP_OK: |
| return; |
| case HTTP_PROXY_AUTH: |
| requestHeaders = new RawHeaders(requestHeaders); |
| URL url = new URL("https", tunnelRequest.host, tunnelRequest.port, "/"); |
| boolean credentialsFound = HttpAuthenticator.processAuthHeader(HTTP_PROXY_AUTH, |
| responseHeaders, requestHeaders, route.proxy, url); |
| if (credentialsFound) { |
| continue; |
| } else { |
| throw new IOException("Failed to authenticate with proxy"); |
| } |
| default: |
| throw new IOException( |
| "Unexpected response code for CONNECT: " + responseHeaders.getResponseCode()); |
| } |
| } |
| } |
| } |