362 lines
15 KiB
Java
362 lines
15 KiB
Java
/*
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* DavMail POP/IMAP/SMTP/CalDav/LDAP Exchange Gateway
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* Copyright (C) 2009 Mickael Guessant
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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package davmail.pop;
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import davmail.AbstractConnection;
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import davmail.BundleMessage;
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import davmail.DavGateway;
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import davmail.Settings;
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import davmail.exchange.DoubleDotOutputStream;
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import davmail.exchange.ExchangeSession;
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import davmail.exchange.ExchangeSessionFactory;
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import davmail.exchange.MessageLoadThread;
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import davmail.ui.tray.DavGatewayTray;
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import davmail.util.IOUtil;
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import org.apache.log4j.Logger;
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import java.io.FilterOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.net.Socket;
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import java.net.SocketException;
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import java.util.Date;
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import java.util.List;
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import java.util.StringTokenizer;
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/**
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* Dav Gateway pop connection implementation
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*/
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public class PopConnection extends AbstractConnection {
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private static final Logger LOGGER = Logger.getLogger(PopConnection.class);
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private List<ExchangeSession.Message> messages;
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/**
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* Initialize the streams and start the thread.
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*
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* @param clientSocket POP client socket
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*/
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public PopConnection(Socket clientSocket) {
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super(PopConnection.class.getSimpleName(), clientSocket, null);
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}
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protected long getTotalMessagesLength() {
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int result = 0;
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for (ExchangeSession.Message message : messages) {
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result += message.size;
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}
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return result;
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}
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protected void printCapabilities() throws IOException {
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sendClient("TOP");
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sendClient("USER");
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sendClient("UIDL");
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sendClient(".");
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}
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protected void printList() throws IOException {
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int i = 1;
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for (ExchangeSession.Message message : messages) {
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sendClient(i++ + " " + message.size);
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}
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sendClient(".");
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}
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protected void printUidList() throws IOException {
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int i = 1;
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for (ExchangeSession.Message message : messages) {
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sendClient(i++ + " " + message.getUid());
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}
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sendClient(".");
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}
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@Override
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public void run() {
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String line;
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StringTokenizer tokens;
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try {
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ExchangeSessionFactory.checkConfig();
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sendOK("DavMail " + DavGateway.getCurrentVersion() + " POP ready at " + new Date());
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for (; ;) {
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line = readClient();
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// unable to read line, connection closed ?
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if (line == null) {
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break;
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}
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tokens = new StringTokenizer(line);
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if (tokens.hasMoreTokens()) {
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String command = tokens.nextToken();
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if ("QUIT".equalsIgnoreCase(command)) {
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// delete messages before quit
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if (session != null) {
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session.purgeOldestTrashAndSentMessages();
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}
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sendOK("Bye");
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break;
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} else if ("USER".equalsIgnoreCase(command)) {
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userName = null;
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password = null;
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session = null;
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if (tokens.hasMoreTokens()) {
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userName = line.substring("USER ".length());
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sendOK("USER : " + userName);
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state = State.USER;
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} else {
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sendERR("invalid syntax");
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state = State.INITIAL;
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}
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} else if ("PASS".equalsIgnoreCase(command)) {
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if (state != State.USER) {
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sendERR("invalid state");
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state = State.INITIAL;
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} else if (!tokens.hasMoreTokens()) {
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sendERR("invalid syntax");
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} else {
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// bug 2194492 : allow space in password
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password = line.substring("PASS".length() + 1);
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try {
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session = ExchangeSessionFactory.getInstance(userName, password);
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sendOK("PASS");
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state = State.AUTHENTICATED;
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} catch (SocketException e) {
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// can not send error to client after a socket exception
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LOGGER.warn(BundleMessage.formatLog("LOG_CLIENT_CLOSED_CONNECTION"));
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} catch (Exception e) {
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DavGatewayTray.error(e);
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sendERR(e);
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}
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}
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} else if ("CAPA".equalsIgnoreCase(command)) {
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sendOK("Capability list follows");
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printCapabilities();
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} else if (state != State.AUTHENTICATED) {
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sendERR("Invalid state not authenticated");
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} else {
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// load messages (once)
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if (messages == null) {
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messages = session.getAllMessageUidAndSize("INBOX");
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}
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if ("STAT".equalsIgnoreCase(command)) {
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sendOK(messages.size() + " " +
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getTotalMessagesLength());
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} else if ("NOOP".equalsIgnoreCase(command)) {
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sendOK("");
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} else if ("LIST".equalsIgnoreCase(command)) {
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if (tokens.hasMoreTokens()) {
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String token = tokens.nextToken();
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try {
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int messageNumber = Integer.valueOf(token);
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ExchangeSession.Message message = messages.get(messageNumber - 1);
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sendOK("" + messageNumber + ' ' + message.size);
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} catch (NumberFormatException e) {
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sendERR("Invalid message index: " + token);
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} catch (IndexOutOfBoundsException e) {
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sendERR("Invalid message index: " + token);
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}
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} else {
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sendOK(messages.size() +
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" messages (" + getTotalMessagesLength() +
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" octets)");
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printList();
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}
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} else if ("UIDL".equalsIgnoreCase(command)) {
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if (tokens.hasMoreTokens()) {
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String token = tokens.nextToken();
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try {
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int messageNumber = Integer.valueOf(token);
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sendOK(messageNumber + " " + messages.get(messageNumber - 1).getUid());
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} catch (NumberFormatException e) {
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sendERR("Invalid message index: " + token);
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} catch (IndexOutOfBoundsException e) {
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sendERR("Invalid message index: " + token);
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}
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} else {
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sendOK(messages.size() +
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" messages (" + getTotalMessagesLength() +
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" octets)");
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printUidList();
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}
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} else if ("RETR".equalsIgnoreCase(command)) {
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if (tokens.hasMoreTokens()) {
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try {
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int messageNumber = Integer.valueOf(tokens.nextToken()) - 1;
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sendOK("");
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DoubleDotOutputStream doubleDotOutputStream = new DoubleDotOutputStream(os);
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ExchangeSession.Message message = messages.get(messageNumber);
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// load big messages in a separate thread
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os.write("+OK ".getBytes());
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MessageLoadThread.loadMimeMessage(message, os);
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sendClient("");
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IOUtil.write(message.getRawInputStream(), doubleDotOutputStream);
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doubleDotOutputStream.close();
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if (Settings.getBooleanProperty("davmail.popMarkReadOnRetr")) {
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message.markRead();
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}
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} catch (SocketException e) {
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// can not send error to client after a socket exception
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LOGGER.warn(BundleMessage.formatLog("LOG_CLIENT_CLOSED_CONNECTION"));
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} catch (Exception e) {
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DavGatewayTray.error(new BundleMessage("LOG_ERROR_RETRIEVING_MESSAGE"), e);
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sendERR("error retrieving message " + e + ' ' + e.getMessage());
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}
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} else {
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sendERR("invalid message index");
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}
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} else if ("DELE".equalsIgnoreCase(command)) {
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if (tokens.hasMoreTokens()) {
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ExchangeSession.Message message;
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try {
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int messageNumber = Integer.valueOf(tokens.
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nextToken()) - 1;
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message = messages.get(messageNumber);
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message.moveToTrash();
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sendOK("DELETE");
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} catch (NumberFormatException e) {
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sendERR("invalid message index");
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} catch (IndexOutOfBoundsException e) {
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sendERR("invalid message index");
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}
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} else {
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sendERR("invalid message index");
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}
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} else if ("TOP".equalsIgnoreCase(command)) {
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int message = 0;
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try {
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message = Integer.valueOf(tokens.nextToken());
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int lines = Integer.valueOf(tokens.nextToken());
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ExchangeSession.Message m = messages.get(message - 1);
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sendOK("");
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DoubleDotOutputStream doubleDotOutputStream = new DoubleDotOutputStream(os);
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IOUtil.write(m.getRawInputStream(), new TopOutputStream(doubleDotOutputStream, lines));
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doubleDotOutputStream.close();
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} catch (NumberFormatException e) {
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sendERR("invalid command");
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} catch (IndexOutOfBoundsException e) {
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sendERR("invalid message index: " + message);
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} catch (Exception e) {
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sendERR("error retreiving top of messages");
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DavGatewayTray.error(e);
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}
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} else if ("RSET".equalsIgnoreCase(command)) {
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sendOK("RSET");
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} else {
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sendERR("unknown command");
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}
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}
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} else {
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sendERR("unknown command");
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}
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os.flush();
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}
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} catch (SocketException e) {
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DavGatewayTray.debug(new BundleMessage("LOG_CONNECTION_CLOSED"));
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} catch (Exception e) {
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DavGatewayTray.log(e);
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try {
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sendERR(e.getMessage());
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} catch (IOException e2) {
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DavGatewayTray.debug(new BundleMessage("LOG_EXCEPTION_SENDING_ERROR_TO_CLIENT"), e2);
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}
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} finally {
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close();
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}
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DavGatewayTray.resetIcon();
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}
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protected void sendOK(String message) throws IOException {
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sendClient("+OK ", message);
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}
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protected void sendERR(Exception e) throws IOException {
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String message = e.getMessage();
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if (message == null) {
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message = e.toString();
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}
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sendERR(message);
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}
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protected void sendERR(String message) throws IOException {
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sendClient("-ERR ", message.replaceAll("\\n", " "));
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}
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/**
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* Filter to limit output lines to max body lines after header
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*/
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private static final class TopOutputStream extends FilterOutputStream {
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private static final int START = 0;
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private static final int CR = 1;
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private static final int CRLF = 2;
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private static final int CRLFCR = 3;
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private static final int BODY = 4;
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private int maxLines;
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private int state = START;
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private TopOutputStream(OutputStream os, int maxLines) {
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super(os);
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this.maxLines = maxLines;
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}
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@Override
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public void write(int b) throws IOException {
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if (state != BODY || maxLines > 0) {
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super.write(b);
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}
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if (state == BODY) {
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if (b == '\n') {
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maxLines--;
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}
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} else if (state == START) {
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if (b == '\r') {
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state = CR;
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}
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} else if (state == CR) {
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if (b == '\n') {
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state = CRLF;
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} else {
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state = START;
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}
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} else if (state == CRLF) {
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if (b == '\r') {
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state = CRLFCR;
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} else {
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state = START;
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}
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} else if (state == CRLFCR) {
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if (b == '\n') {
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state = BODY;
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} else {
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state = START;
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}
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}
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}
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}
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}
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