com.sun.mail.iap.Protocol Maven / Gradle / Ivy
/*
* Copyright (c) 1997, 2021 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package com.sun.mail.iap;
import java.util.Properties;
import java.io.*;
import java.nio.channels.SocketChannel;
import java.net.*;
import javax.net.ssl.SSLSocket;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Level;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.Inflater;
import java.util.zip.InflaterInputStream;
import java.lang.reflect.Field;
import com.sun.mail.util.MailLogger;
import com.sun.mail.util.PropUtil;
import com.sun.mail.util.SocketFetcher;
import com.sun.mail.util.TraceInputStream;
import com.sun.mail.util.TraceOutputStream;
/**
* General protocol handling code for IMAP-like protocols.
*
* The Protocol object is multithread safe.
*
* @author John Mani
* @author Max Spivak
* @author Bill Shannon
*/
public class Protocol {
protected String host;
private Socket socket;
// in case we turn on TLS, we'll need these later
protected boolean quote;
protected MailLogger logger;
protected MailLogger traceLogger;
protected Properties props;
protected String prefix;
private TraceInputStream traceInput; // the Tracer
private volatile ResponseInputStream input;
private TraceOutputStream traceOutput; // the Tracer
private volatile DataOutputStream output;
private int tagCounter = 0;
private final String tagPrefix;
private String localHostName;
private final List handlers
= new CopyOnWriteArrayList<>();
private volatile long timestamp;
// package private, to allow testing
static final AtomicInteger tagNum = new AtomicInteger();
private static final byte[] CRLF = { (byte)'\r', (byte)'\n'};
/**
* Constructor.
*
* Opens a connection to the given host at given port.
*
* @param host host to connect to
* @param port portnumber to connect to
* @param props Properties object used by this protocol
* @param prefix Prefix to prepend to property keys
* @param isSSL use SSL?
* @param logger log messages here
* @exception IOException for I/O errors
* @exception ProtocolException for protocol failures
*/
public Protocol(String host, int port,
Properties props, String prefix,
boolean isSSL, MailLogger logger)
throws IOException, ProtocolException {
boolean connected = false; // did constructor succeed?
tagPrefix = computePrefix(props, prefix);
try {
this.host = host;
this.props = props;
this.prefix = prefix;
this.logger = logger;
traceLogger = logger.getSubLogger("protocol", null);
socket = SocketFetcher.getSocket(host, port, props, prefix, isSSL);
quote = PropUtil.getBooleanProperty(props,
"mail.debug.quote", false);
initStreams();
// Read server greeting
processGreeting(readResponse());
timestamp = System.currentTimeMillis();
connected = true; // must be last statement in constructor
} finally {
/*
* If we get here because an exception was thrown, we need
* to disconnect to avoid leaving a connected socket that
* no one will be able to use because this object was never
* completely constructed.
*/
if (!connected)
disconnect();
}
}
private void initStreams() throws IOException {
traceInput = new TraceInputStream(socket.getInputStream(), traceLogger);
traceInput.setQuote(quote);
input = new ResponseInputStream(traceInput);
traceOutput =
new TraceOutputStream(socket.getOutputStream(), traceLogger);
traceOutput.setQuote(quote);
output = new DataOutputStream(new BufferedOutputStream(traceOutput));
}
/**
* Compute the tag prefix to be used for this connection.
* Start with "A" - "Z", then "AA" - "ZZ", and finally "AAA" - "ZZZ".
* Wrap around after that.
*/
private String computePrefix(Properties props, String prefix) {
// XXX - in case someone depends on the tag prefix
if (PropUtil.getBooleanProperty(props,
prefix + ".reusetagprefix", false))
return "A";
// tag prefix, wrap around after three letters
int n = tagNum.getAndIncrement() % (26*26*26 + 26*26 + 26);
String tagPrefix;
if (n < 26)
tagPrefix = new String(new char[] { (char)('A' + n) });
else if (n < (26*26 + 26)) {
n -= 26;
tagPrefix = new String(new char[] {
(char)('A' + n/26), (char)('A' + n%26) });
} else {
n -= (26*26 + 26);
tagPrefix = new String(new char[] {
(char)('A' + n/(26*26)),
(char)('A' + (n%(26*26))/26),
(char)('A' + n%26) });
}
return tagPrefix;
}
/**
* Constructor for debugging.
*
* @param in the InputStream to read from
* @param out the PrintStream to write to
* @param props Properties object used by this protocol
* @param debug true to enable debugging output
* @exception IOException for I/O errors
*/
public Protocol(InputStream in, PrintStream out, Properties props,
boolean debug) throws IOException {
this.host = "localhost";
this.props = props;
this.quote = false;
tagPrefix = computePrefix(props, "mail.imap");
logger = new MailLogger(this.getClass(), "DEBUG", debug, System.out);
traceLogger = logger.getSubLogger("protocol", null);
// XXX - inlined initStreams, won't allow later startTLS
traceInput = new TraceInputStream(in, traceLogger);
traceInput.setQuote(quote);
input = new ResponseInputStream(traceInput);
traceOutput = new TraceOutputStream(out, traceLogger);
traceOutput.setQuote(quote);
output = new DataOutputStream(new BufferedOutputStream(traceOutput));
timestamp = System.currentTimeMillis();
}
/**
* Returns the timestamp.
*
* @return the timestamp
*/
public long getTimestamp() {
return timestamp;
}
/**
* Adds a response handler.
*
* @param h the response handler
*/
public void addResponseHandler(ResponseHandler h) {
handlers.add(h);
}
/**
* Removed the specified response handler.
*
* @param h the response handler
*/
public void removeResponseHandler(ResponseHandler h) {
handlers.remove(h);
}
/**
* Notify response handlers
*
* @param responses the responses
*/
public void notifyResponseHandlers(Response[] responses) {
if (handlers.isEmpty()) {
return;
}
for (Response r : responses) {
if (r != null) {
for (ResponseHandler rh : handlers) {
if (rh != null) {
rh.handleResponse(r);
}
}
}
}
}
protected void processGreeting(Response r) throws ProtocolException {
if (r.isBYE())
throw new ConnectionException(this, r);
}
/**
* Return the Protocol's InputStream.
*
* @return the input stream
*/
protected ResponseInputStream getInputStream() {
return input;
}
/**
* Return the Protocol's OutputStream
*
* @return the output stream
*/
protected OutputStream getOutputStream() {
return output;
}
/**
* Returns whether this Protocol supports non-synchronizing literals
* Default is false. Subclasses should override this if required
*
* @return true if the server supports non-synchronizing literals
*/
protected synchronized boolean supportsNonSyncLiterals() {
return false;
}
public Response readResponse()
throws IOException, ProtocolException {
return new Response(this);
}
/**
* Is another response available in our buffer?
*
* @return true if another response is in the buffer
* @since JavaMail 1.5.4
*/
public boolean hasResponse() {
/*
* XXX - Really should peek ahead in the buffer to see
* if there's a *complete* response available, but if there
* isn't who's going to read more data into the buffer
* until there is?
*/
try {
return input.available() > 0;
} catch (IOException ex) {
}
return false;
}
/**
* Return a buffer to be used to read a response.
* The default implementation returns null, which causes
* a new buffer to be allocated for every response.
*
* @return the buffer to use
* @since JavaMail 1.4.1
*/
protected ByteArray getResponseBuffer() {
return null;
}
public String writeCommand(String command, Argument args)
throws IOException, ProtocolException {
// assert Thread.holdsLock(this);
// can't assert because it's called from constructor
String tag = tagPrefix + Integer.toString(tagCounter++); // unique tag
output.writeBytes(tag + " " + command);
if (args != null) {
output.write(' ');
args.write(this);
}
output.write(CRLF);
output.flush();
return tag;
}
/**
* Send a command to the server. Collect all responses until either
* the corresponding command completion response or a BYE response
* (indicating server failure). Return all the collected responses.
*
* @param command the command
* @param args the arguments
* @return array of Response objects returned by the server
*/
public synchronized Response[] command(String command, Argument args) {
commandStart(command);
List v = new ArrayList<>();
boolean done = false;
String tag = null;
// write the command
try {
tag = writeCommand(command, args);
} catch (LiteralException lex) {
v.add(lex.getResponse());
done = true;
} catch (Exception ex) {
// Convert this into a BYE response
v.add(Response.byeResponse(ex));
done = true;
}
Response byeResp = null;
while (!done) {
Response r = null;
try {
r = readResponse();
} catch (IOException ioex) {
if (byeResp == null) // convert this into a BYE response
byeResp = Response.byeResponse(ioex);
// else, connection closed after BYE was sent
break;
} catch (ProtocolException pex) {
logger.log(Level.FINE, "ignoring bad response", pex);
continue; // skip this response
}
if (r.isBYE()) {
byeResp = r;
continue;
}
v.add(r);
// If this is a matching command completion response, we are done
if (r.isTagged() && r.getTag().equals(tag))
done = true;
}
if (byeResp != null)
v.add(byeResp); // must be last
Response[] responses = new Response[v.size()];
v.toArray(responses);
timestamp = System.currentTimeMillis();
commandEnd();
return responses;
}
/**
* Convenience routine to handle OK, NO, BAD and BYE responses.
*
* @param response the response
* @exception ProtocolException for protocol failures
*/
public void handleResult(Response response) throws ProtocolException {
if (response.isOK())
return;
else if (response.isNO())
throw new CommandFailedException(response);
else if (response.isBAD())
throw new BadCommandException(response);
else if (response.isBYE()) {
disconnect();
throw new ConnectionException(this, response);
}
}
/**
* Convenience routine to handle simple IAP commands
* that do not have responses specific to that command.
*
* @param cmd the command
* @param args the arguments
* @exception ProtocolException for protocol failures
*/
public void simpleCommand(String cmd, Argument args)
throws ProtocolException {
// Issue command
Response[] r = command(cmd, args);
// dispatch untagged responses
notifyResponseHandlers(r);
// Handle result of this command
handleResult(r[r.length-1]);
}
/**
* Start TLS on the current connection.
* cmd is the command to issue to start TLS negotiation.
* If the command succeeds, we begin TLS negotiation.
* If the socket is already an SSLSocket this is a nop and the command
* is not issued.
*
* @param cmd the command to issue
* @exception IOException for I/O errors
* @exception ProtocolException for protocol failures
*/
public synchronized void startTLS(String cmd)
throws IOException, ProtocolException {
if (socket instanceof SSLSocket)
return; // nothing to do
simpleCommand(cmd, null);
socket = SocketFetcher.startTLS(socket, host, props, prefix);
initStreams();
}
/**
* Start compression on the current connection.
* cmd is the command to issue to start compression.
* If the command succeeds, we begin compression.
*
* @param cmd the command to issue
* @exception IOException for I/O errors
* @exception ProtocolException for protocol failures
*/
public synchronized void startCompression(String cmd)
throws IOException, ProtocolException {
// XXX - check whether compression is already enabled?
simpleCommand(cmd, null);
// need to create our own Inflater and Deflater in order to set nowrap
Inflater inf = new Inflater(true);
traceInput = new TraceInputStream(new InflaterInputStream(
socket.getInputStream(), inf), traceLogger);
traceInput.setQuote(quote);
input = new ResponseInputStream(traceInput);
// configure the Deflater
int level = PropUtil.getIntProperty(props, prefix + ".compress.level",
Deflater.DEFAULT_COMPRESSION);
int strategy = PropUtil.getIntProperty(props,
prefix + ".compress.strategy",
Deflater.DEFAULT_STRATEGY);
if (logger.isLoggable(Level.FINE))
logger.log(Level.FINE,
"Creating Deflater with compression level {0} and strategy {1}",
new Object[] { level, strategy });
Deflater def = new Deflater(Deflater.DEFAULT_COMPRESSION, true);
try {
def.setLevel(level);
} catch (IllegalArgumentException ex) {
logger.log(Level.FINE, "Ignoring bad compression level", ex);
}
try {
def.setStrategy(strategy);
} catch (IllegalArgumentException ex) {
logger.log(Level.FINE, "Ignoring bad compression strategy", ex);
}
traceOutput = new TraceOutputStream(new DeflaterOutputStream(
socket.getOutputStream(), def, true), traceLogger);
traceOutput.setQuote(quote);
output = new DataOutputStream(new BufferedOutputStream(traceOutput));
}
/**
* Is this connection using an SSL socket?
*
* @return true if using SSL
* @since JavaMail 1.4.6
*/
public boolean isSSL() {
return socket instanceof SSLSocket;
}
/**
* Return the address the socket connected to.
*
* @return the InetAddress the socket is connected to
* @since JavaMail 1.5.2
*/
public InetAddress getInetAddress() {
return socket.getInetAddress();
}
/**
* Return the SocketChannel associated with this connection, if any.
*
* @return the SocketChannel
* @since JavaMail 1.5.2
*/
public SocketChannel getChannel() {
SocketChannel ret = socket.getChannel();
if (ret != null)
return ret;
if (socket instanceof SSLSocket) {
ret = Protocol.findSocketChannel(socket);
}
return ret;
}
/**
* Android is broken and SSL wrapped sockets don't delegate
* the getChannel method to the wrapped Socket.
*
* @param socket a non null socket
* @return the SocketChannel or null if not found
*/
private static SocketChannel findSocketChannel(Socket socket) {
//Search class hierarchy for field name socket regardless of modifier.
for (Class k = socket.getClass(); k != Object.class; k = k.getSuperclass()) {
try {
Field f = k.getDeclaredField("socket");
f.setAccessible(true);
Socket s = (Socket) f.get(socket);
SocketChannel ret = s.getChannel();
if (ret != null) {
return ret;
}
} catch (Exception ignore) {
//ignore anything that might go wrong
}
}
//Search class hierarchy for fields that can hold a Socket
//or subclass regardless of modifier. Fields declared as super types of Socket
//will be ignored.
for (Class k = socket.getClass(); k != Object.class; k = k.getSuperclass()) {
try {
for (Field f : k.getDeclaredFields()) {
if (Socket.class.isAssignableFrom(f.getType())) {
try {
f.setAccessible(true);
Socket s = (Socket) f.get(socket);
SocketChannel ret = s.getChannel();
if (ret != null) {
return ret;
}
} catch (Exception ignore) {
//ignore anything that might go wrong
}
}
}
} catch (Exception ignore) {
//ignore anything that might go wrong
}
}
return null;
}
/**
* Return the local SocketAddress (host and port) for this
* end of the connection.
*
* @return the SocketAddress
* @since Jakarta Mail 1.6.4
*/
public SocketAddress getLocalSocketAddress() {
return socket.getLocalSocketAddress();
}
/**
* Does the server support UTF-8?
* This implementation returns false.
* Subclasses should override as appropriate.
*
* @return true if the server supports UTF-8
* @since JavaMail 1.6.0
*/
public boolean supportsUtf8() {
return false;
}
/**
* Disconnect.
*/
protected synchronized void disconnect() {
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
// ignore it
}
socket = null;
}
}
/**
* Get the name of the local host.
* The property <prefix>.localhost overrides
* <prefix>.localaddress,
* which overrides what InetAddress would tell us.
*
* @return the name of the local host
*/
protected synchronized String getLocalHost() {
// get our hostname and cache it for future use
if (localHostName == null || localHostName.length() <= 0)
localHostName =
props.getProperty(prefix + ".localhost");
if (localHostName == null || localHostName.length() <= 0)
localHostName =
props.getProperty(prefix + ".localaddress");
try {
if (localHostName == null || localHostName.length() <= 0) {
InetAddress localHost = InetAddress.getLocalHost();
localHostName = localHost.getCanonicalHostName();
// if we can't get our name, use local address literal
if (localHostName == null)
// XXX - not correct for IPv6
localHostName = "[" + localHost.getHostAddress() + "]";
}
} catch (UnknownHostException uhex) {
}
// last chance, try to get our address from our socket
if (localHostName == null || localHostName.length() <= 0) {
if (socket != null && socket.isBound()) {
InetAddress localHost = socket.getLocalAddress();
localHostName = localHost.getCanonicalHostName();
// if we can't get our name, use local address literal
if (localHostName == null)
// XXX - not correct for IPv6
localHostName = "[" + localHost.getHostAddress() + "]";
}
}
return localHostName;
}
/**
* Is protocol tracing enabled?
*
* @return true if protocol tracing is enabled
*/
protected boolean isTracing() {
return traceLogger.isLoggable(Level.FINEST);
}
/**
* Temporarily turn off protocol tracing, e.g., to prevent
* tracing the authentication sequence, including the password.
*/
protected void suspendTracing() {
if (traceLogger.isLoggable(Level.FINEST)) {
traceInput.setTrace(false);
traceOutput.setTrace(false);
}
}
/**
* Resume protocol tracing, if it was enabled to begin with.
*/
protected void resumeTracing() {
if (traceLogger.isLoggable(Level.FINEST)) {
traceInput.setTrace(true);
traceOutput.setTrace(true);
}
}
/**
* Finalizer.
*/
@Override
protected void finalize() throws Throwable {
try {
disconnect();
} finally {
super.finalize();
}
}
/*
* Probe points for GlassFish monitoring.
*/
private void commandStart(String command) { }
private void commandEnd() { }
}