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- /*
- * Copyright (C) 2009, Constantine Plotnikov <constantine.plotnikov@gmail.com>
- * Copyright (C) 2008-2009, Google Inc.
- * Copyright (C) 2009, Google, Inc.
- * Copyright (C) 2009, JetBrains s.r.o.
- * Copyright (C) 2008, Robin Rosenberg <robin.rosenberg@dewire.com>
- * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org> and others
- *
- * This program and the accompanying materials are made available under the
- * terms of the Eclipse Distribution License v. 1.0 which is available at
- * https://www.eclipse.org/org/documents/edl-v10.php.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
- //TODO(ms): move to org.eclipse.jgit.ssh.jsch in 6.0
- package org.eclipse.jgit.transport;
-
- import java.io.BufferedOutputStream;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.OutputStream;
- import java.util.ArrayList;
- import java.util.Collection;
- import java.util.List;
- import java.util.concurrent.Callable;
- import java.util.concurrent.TimeUnit;
-
- import org.eclipse.jgit.errors.TransportException;
- import org.eclipse.jgit.internal.transport.jsch.JSchText;
- import org.eclipse.jgit.util.io.IsolatedOutputStream;
-
- import com.jcraft.jsch.Channel;
- import com.jcraft.jsch.ChannelExec;
- import com.jcraft.jsch.ChannelSftp;
- import com.jcraft.jsch.JSchException;
- import com.jcraft.jsch.Session;
- import com.jcraft.jsch.SftpException;
-
- /**
- * Run remote commands using Jsch.
- * <p>
- * This class is the default session implementation using Jsch. Note that
- * {@link org.eclipse.jgit.transport.JschConfigSessionFactory} is used to create
- * the actual session passed to the constructor.
- */
- public class JschSession implements RemoteSession {
- final Session sock;
- final URIish uri;
-
- /**
- * Create a new session object by passing the real Jsch session and the URI
- * information.
- *
- * @param session
- * the real Jsch session created elsewhere.
- * @param uri
- * the URI information for the remote connection
- */
- public JschSession(Session session, URIish uri) {
- sock = session;
- this.uri = uri;
- }
-
- /** {@inheritDoc} */
- @Override
- public Process exec(String command, int timeout) throws IOException {
- return new JschProcess(command, timeout);
- }
-
- /** {@inheritDoc} */
- @Override
- public void disconnect() {
- if (sock.isConnected())
- sock.disconnect();
- }
-
- /**
- * A kludge to allow {@link org.eclipse.jgit.transport.TransportSftp} to get
- * an Sftp channel from Jsch. Ideally, this method would be generic, which
- * would require implementing generic Sftp channel operations in the
- * RemoteSession class.
- *
- * @return a channel suitable for Sftp operations.
- * @throws com.jcraft.jsch.JSchException
- * on problems getting the channel.
- * @deprecated since 5.2; use {@link #getFtpChannel()} instead
- */
- @Deprecated
- public Channel getSftpChannel() throws JSchException {
- return sock.openChannel("sftp"); //$NON-NLS-1$
- }
-
- /**
- * {@inheritDoc}
- *
- * @since 5.2
- */
- @Override
- public FtpChannel getFtpChannel() {
- return new JschFtpChannel();
- }
-
- /**
- * Implementation of Process for running a single command using Jsch.
- * <p>
- * Uses the Jsch session to do actual command execution and manage the
- * execution.
- */
- private class JschProcess extends Process {
- private ChannelExec channel;
-
- final int timeout;
-
- private InputStream inputStream;
-
- private OutputStream outputStream;
-
- private InputStream errStream;
-
- /**
- * Opens a channel on the session ("sock") for executing the given
- * command, opens streams, and starts command execution.
- *
- * @param commandName
- * the command to execute
- * @param tms
- * the timeout value, in seconds, for the command.
- * @throws TransportException
- * on problems opening a channel or connecting to the remote
- * host
- * @throws IOException
- * on problems opening streams
- */
- JschProcess(String commandName, int tms)
- throws TransportException, IOException {
- timeout = tms;
- try {
- channel = (ChannelExec) sock.openChannel("exec"); //$NON-NLS-1$
- channel.setCommand(commandName);
- setupStreams();
- channel.connect(timeout > 0 ? timeout * 1000 : 0);
- if (!channel.isConnected()) {
- closeOutputStream();
- throw new TransportException(uri,
- JSchText.get().connectionFailed);
- }
- } catch (JSchException e) {
- closeOutputStream();
- throw new TransportException(uri, e.getMessage(), e);
- }
- }
-
- private void closeOutputStream() {
- if (outputStream != null) {
- try {
- outputStream.close();
- } catch (IOException ioe) {
- // ignore
- }
- }
- }
-
- private void setupStreams() throws IOException {
- inputStream = channel.getInputStream();
-
- // JSch won't let us interrupt writes when we use our InterruptTimer
- // to break out of a long-running write operation. To work around
- // that we spawn a background thread to shuttle data through a pipe,
- // as we can issue an interrupted write out of that. Its slower, so
- // we only use this route if there is a timeout.
- OutputStream out = channel.getOutputStream();
- if (timeout <= 0) {
- outputStream = out;
- } else {
- IsolatedOutputStream i = new IsolatedOutputStream(out);
- outputStream = new BufferedOutputStream(i, 16 * 1024);
- }
-
- errStream = channel.getErrStream();
- }
-
- @Override
- public InputStream getInputStream() {
- return inputStream;
- }
-
- @Override
- public OutputStream getOutputStream() {
- return outputStream;
- }
-
- @Override
- public InputStream getErrorStream() {
- return errStream;
- }
-
- @Override
- public int exitValue() {
- if (isRunning())
- throw new IllegalThreadStateException();
- return channel.getExitStatus();
- }
-
- private boolean isRunning() {
- return channel.getExitStatus() < 0 && channel.isConnected();
- }
-
- @Override
- public void destroy() {
- if (channel.isConnected())
- channel.disconnect();
- closeOutputStream();
- }
-
- @Override
- public int waitFor() throws InterruptedException {
- while (isRunning())
- Thread.sleep(100);
- return exitValue();
- }
- }
-
- private class JschFtpChannel implements FtpChannel {
-
- private ChannelSftp ftp;
-
- @Override
- public void connect(int timeout, TimeUnit unit) throws IOException {
- try {
- ftp = (ChannelSftp) sock.openChannel("sftp"); //$NON-NLS-1$
- ftp.connect((int) unit.toMillis(timeout));
- } catch (JSchException e) {
- ftp = null;
- throw new IOException(e.getLocalizedMessage(), e);
- }
- }
-
- @Override
- public void disconnect() {
- ftp.disconnect();
- ftp = null;
- }
-
- private <T> T map(Callable<T> op) throws IOException {
- try {
- return op.call();
- } catch (Exception e) {
- if (e instanceof SftpException) {
- throw new FtpChannel.FtpException(e.getLocalizedMessage(),
- ((SftpException) e).id, e);
- }
- throw new IOException(e.getLocalizedMessage(), e);
- }
- }
-
- @Override
- public boolean isConnected() {
- return ftp != null && sock.isConnected();
- }
-
- @Override
- public void cd(String path) throws IOException {
- map(() -> {
- ftp.cd(path);
- return null;
- });
- }
-
- @Override
- public String pwd() throws IOException {
- return map(() -> ftp.pwd());
- }
-
- @Override
- public Collection<DirEntry> ls(String path) throws IOException {
- return map(() -> {
- List<DirEntry> result = new ArrayList<>();
- for (Object e : ftp.ls(path)) {
- ChannelSftp.LsEntry entry = (ChannelSftp.LsEntry) e;
- result.add(new DirEntry() {
-
- @Override
- public String getFilename() {
- return entry.getFilename();
- }
-
- @Override
- public long getModifiedTime() {
- return entry.getAttrs().getMTime();
- }
-
- @Override
- public boolean isDirectory() {
- return entry.getAttrs().isDir();
- }
- });
- }
- return result;
- });
- }
-
- @Override
- public void rmdir(String path) throws IOException {
- map(() -> {
- ftp.rm(path);
- return null;
- });
- }
-
- @Override
- public void mkdir(String path) throws IOException {
- map(() -> {
- ftp.mkdir(path);
- return null;
- });
- }
-
- @Override
- public InputStream get(String path) throws IOException {
- return map(() -> ftp.get(path));
- }
-
- @Override
- public OutputStream put(String path) throws IOException {
- return map(() -> ftp.put(path));
- }
-
- @Override
- public void rm(String path) throws IOException {
- map(() -> {
- ftp.rm(path);
- return null;
- });
- }
-
- @Override
- public void rename(String from, String to) throws IOException {
- map(() -> {
- // Plain FTP rename will fail if "to" exists. Jsch knows about
- // the FTP extension "posix-rename@openssh.com", which will
- // remove "to" first if it exists.
- if (hasPosixRename()) {
- ftp.rename(from, to);
- } else if (!to.equals(from)) {
- // Try to remove "to" first. With git, we typically get this
- // when a lock file is moved over the file locked. Note that
- // the check for to being equal to from may still fail in
- // the general case, but for use with JGit's TransportSftp
- // it should be good enough.
- delete(to);
- ftp.rename(from, to);
- }
- return null;
- });
- }
-
- /**
- * Determine whether the server has the posix-rename extension.
- *
- * @return {@code true} if it is supported, {@code false} otherwise
- * @see <a href=
- * "https://cvsweb.openbsd.org/src/usr.bin/ssh/PROTOCOL?annotate=HEAD">OpenSSH
- * deviations and extensions to the published SSH protocol</a>
- * @see <a href=
- * "http://pubs.opengroup.org/onlinepubs/9699919799/functions/rename.html">stdio.h:
- * rename()</a>
- */
- private boolean hasPosixRename() {
- return "1".equals(ftp.getExtension("posix-rename@openssh.com")); //$NON-NLS-1$//$NON-NLS-2$
- }
- }
- }
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