QtSsh

client/3rd/QtSsh/src/ssh/sftpchannel.cpp

@@ -0,0 +1,972 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#include "sftpchannel.h"
+#include "sftpchannel_p.h"
+
+#include "sshexception_p.h"
+#include "sshincomingpacket_p.h"
+#include "sshlogging_p.h"
+#include "sshsendfacility_p.h"
+
+#include <QDir>
+#include <QFile>
+
+/*!
+    \class QSsh::SftpChannel
+
+    \brief The SftpChannel class provides SFTP operations.
+
+    Objects are created via SshConnection::createSftpChannel().
+    The channel needs to be initialized with
+    a call to initialize() and is closed via closeChannel(). After closing
+    a channel, no more operations are possible. It cannot be re-opened
+    using initialize(); use SshConnection::createSftpChannel() if you need
+    a new one.
+
+    After the initialized() signal has been emitted, operations can be started.
+    All SFTP operations are asynchronous (non-blocking) and can be in-flight
+    simultaneously (though callers must ensure that concurrently running jobs
+    are independent of each other, e.g. they must not write to the same file).
+    Operations are identified by their job id, which is returned by
+    the respective member function. If the function can right away detect that
+    the operation cannot succeed, it returns SftpInvalidJob. If an error occurs
+    later, the finished() signal is emitted for the respective job with a
+    non-empty error string.
+
+    Note that directory names must not have a trailing slash.
+*/
+
+namespace QSsh {
+namespace Internal {
+namespace {
+    const quint32 ProtocolVersion = 3;
+
+    QString errorMessage(const QString &serverMessage,
+        const QString &alternativeMessage)
+    {
+        return serverMessage.isEmpty() ? alternativeMessage : serverMessage;
+    }
+
+    QString errorMessage(const SftpStatusResponse &response,
+        const QString &alternativeMessage)
+    {
+        return response.status == SSH_FX_OK ? QString()
+            : errorMessage(response.errorString, alternativeMessage);
+    }
+} // anonymous namespace
+} // namespace Internal
+
+SftpChannel::SftpChannel(quint32 channelId,
+    Internal::SshSendFacility &sendFacility)
+    : d(new Internal::SftpChannelPrivate(channelId, sendFacility, this))
+{
+    connect(d, &Internal::SftpChannelPrivate::initialized,
+            this, &SftpChannel::initialized, Qt::QueuedConnection);
+    connect(d, &Internal::SftpChannelPrivate::channelError,
+            this, &SftpChannel::channelError, Qt::QueuedConnection);
+    connect(d, &Internal::SftpChannelPrivate::dataAvailable,
+            this, &SftpChannel::dataAvailable, Qt::QueuedConnection);
+    connect(d, &Internal::SftpChannelPrivate::fileInfoAvailable,
+            this, &SftpChannel::fileInfoAvailable, Qt::QueuedConnection);
+    connect(d, &Internal::SftpChannelPrivate::finished,
+            this, &SftpChannel::finished, Qt::QueuedConnection);
+    connect(d, &Internal::SftpChannelPrivate::closed,
+            this, &SftpChannel::closed, Qt::QueuedConnection);
+}
+
+SftpChannel::State SftpChannel::state() const
+{
+    switch (d->channelState()) {
+    case Internal::AbstractSshChannel::Inactive:
+        return Uninitialized;
+    case Internal::AbstractSshChannel::SessionRequested:
+        return Initializing;
+    case Internal::AbstractSshChannel::CloseRequested:
+        return Closing;
+    case Internal::AbstractSshChannel::Closed:
+        return Closed;
+    case Internal::AbstractSshChannel::SessionEstablished:
+        return d->m_sftpState == Internal::SftpChannelPrivate::Initialized
+            ? Initialized : Initializing;
+    default:
+        Q_ASSERT(!"Oh no, we forgot to handle a channel state!");
+        return Closed; // For the compiler.
+    }
+}
+
+void SftpChannel::initialize()
+{
+    d->requestSessionStart();
+    d->m_sftpState = Internal::SftpChannelPrivate::SubsystemRequested;
+}
+
+void SftpChannel::closeChannel()
+{
+    d->closeChannel();
+}
+
+SftpJobId SftpChannel::statFile(const QString &path)
+{
+    return d->createJob(Internal::SftpStatFile::Ptr(
+        new Internal::SftpStatFile(++d->m_nextJobId, path)));
+}
+
+SftpJobId SftpChannel::listDirectory(const QString &path)
+{
+    return d->createJob(Internal::SftpListDir::Ptr(
+        new Internal::SftpListDir(++d->m_nextJobId, path)));
+}
+
+SftpJobId SftpChannel::createDirectory(const QString &path)
+{
+    return d->createJob(Internal::SftpMakeDir::Ptr(
+        new Internal::SftpMakeDir(++d->m_nextJobId, path)));
+}
+
+SftpJobId SftpChannel::removeDirectory(const QString &path)
+{
+    return d->createJob(Internal::SftpRmDir::Ptr(
+        new Internal::SftpRmDir(++d->m_nextJobId, path)));
+}
+
+SftpJobId SftpChannel::removeFile(const QString &path)
+{
+    return d->createJob(Internal::SftpRm::Ptr(
+        new Internal::SftpRm(++d->m_nextJobId, path)));
+}
+
+SftpJobId SftpChannel::renameFileOrDirectory(const QString &oldPath,
+    const QString &newPath)
+{
+    return d->createJob(Internal::SftpRename::Ptr(
+        new Internal::SftpRename(++d->m_nextJobId, oldPath, newPath)));
+}
+
+SftpJobId SftpChannel::createLink(const QString &filePath, const QString &target)
+{
+    return d->createJob(Internal::SftpCreateLink::Ptr(
+        new Internal::SftpCreateLink(++d->m_nextJobId, filePath, target)));
+}
+
+SftpJobId SftpChannel::createFile(const QString &path, SftpOverwriteMode mode)
+{
+    return d->createJob(Internal::SftpCreateFile::Ptr(
+        new Internal::SftpCreateFile(++d->m_nextJobId, path, mode)));
+}
+
+SftpJobId SftpChannel::uploadFile(const QString &localFilePath,
+    const QString &remoteFilePath, SftpOverwriteMode mode)
+{
+    QSharedPointer<QFile> localFile(new QFile(localFilePath));
+    if (!localFile->open(QIODevice::ReadOnly))
+        return SftpInvalidJob;
+    return d->createJob(Internal::SftpUploadFile::Ptr(
+        new Internal::SftpUploadFile(++d->m_nextJobId, remoteFilePath, localFile, mode)));
+}
+
+SftpJobId SftpChannel::downloadFile(const QString &remoteFilePath,
+    const QString &localFilePath, SftpOverwriteMode mode)
+{
+    QSharedPointer<QFile> localFile(new QFile(localFilePath));
+    if (mode == SftpSkipExisting && localFile->exists())
+        return SftpInvalidJob;
+    QIODevice::OpenMode openMode = QIODevice::WriteOnly;
+    if (mode == SftpOverwriteExisting)
+        openMode |= QIODevice::Truncate;
+    else if (mode == SftpAppendToExisting)
+        openMode |= QIODevice::Append;
+    if (!localFile->open(openMode))
+        return SftpInvalidJob;
+    return d->createJob(Internal::SftpDownload::Ptr(
+        new Internal::SftpDownload(++d->m_nextJobId, remoteFilePath, localFile)));
+}
+
+SftpJobId SftpChannel::uploadDir(const QString &localDirPath,
+    const QString &remoteParentDirPath)
+{
+    if (state() != Initialized)
+        return SftpInvalidJob;
+    const QDir localDir(localDirPath);
+    if (!localDir.exists() || !localDir.isReadable())
+        return SftpInvalidJob;
+    const Internal::SftpUploadDir::Ptr uploadDirOp(
+        new Internal::SftpUploadDir(++d->m_nextJobId));
+    const QString remoteDirPath
+        = remoteParentDirPath + QLatin1Char('/') + localDir.dirName();
+    const Internal::SftpMakeDir::Ptr mkdirOp(
+        new Internal::SftpMakeDir(++d->m_nextJobId, remoteDirPath, uploadDirOp));
+    uploadDirOp->mkdirsInProgress.insert(mkdirOp,
+        Internal::SftpUploadDir::Dir(localDirPath, remoteDirPath));
+    d->createJob(mkdirOp);
+    return uploadDirOp->jobId;
+}
+
+SftpChannel::~SftpChannel()
+{
+    delete d;
+}
+
+
+namespace Internal {
+
+SftpChannelPrivate::SftpChannelPrivate(quint32 channelId,
+    SshSendFacility &sendFacility, SftpChannel *sftp)
+    : AbstractSshChannel(channelId, sendFacility),
+      m_nextJobId(0), m_sftpState(Inactive), m_sftp(sftp)
+{
+}
+
+SftpJobId SftpChannelPrivate::createJob(const AbstractSftpOperation::Ptr &job)
+{
+   if (m_sftp->state() != SftpChannel::Initialized)
+       return SftpInvalidJob;
+   m_jobs.insert(job->jobId, job);
+   sendData(job->initialPacket(m_outgoingPacket).rawData());
+   return job->jobId;
+}
+
+void SftpChannelPrivate::handleChannelSuccess()
+{
+    if (channelState() == CloseRequested)
+        return;
+    qCDebug(sshLog, "sftp subsystem initialized");
+    sendData(m_outgoingPacket.generateInit(ProtocolVersion).rawData());
+    m_sftpState = InitSent;
+}
+
+void SftpChannelPrivate::handleChannelFailure()
+{
+    if (channelState() == CloseRequested)
+        return;
+
+    if (m_sftpState != SubsystemRequested) {
+        throw SSH_SERVER_EXCEPTION(SSH_DISCONNECT_PROTOCOL_ERROR,
+            "Unexpected SSH_MSG_CHANNEL_FAILURE packet.");
+    }
+    emit channelError(tr("Server could not start SFTP subsystem."));
+    closeChannel();
+}
+
+void SftpChannelPrivate::handleChannelDataInternal(const QByteArray &data)
+{
+    if (channelState() == CloseRequested)
+        return;
+
+    m_incomingData += data;
+    m_incomingPacket.consumeData(m_incomingData);
+    while (m_incomingPacket.isComplete()) {
+        handleCurrentPacket();
+        m_incomingPacket.clear();
+        m_incomingPacket.consumeData(m_incomingData);
+    }
+}
+
+void SftpChannelPrivate::handleChannelExtendedDataInternal(quint32 type,
+    const QByteArray &data)
+{
+    qCWarning(sshLog, "Unexpected extended data '%s' of type %d on SFTP channel.",
+              data.data(), type);
+}
+
+void SftpChannelPrivate::handleExitStatus(const SshChannelExitStatus &exitStatus)
+{
+    qCDebug(sshLog, "Remote SFTP service exited with exit code %d", exitStatus.exitStatus);
+
+    if (channelState() == CloseRequested || channelState() == Closed)
+        return;
+
+    emit channelError(tr("The SFTP server finished unexpectedly with exit code %1.")
+                      .arg(exitStatus.exitStatus));
+
+    // Note: According to the specs, the server must close the channel after this happens,
+    // but OpenSSH doesn't do that, so we need to initiate the closing procedure ourselves.
+    closeChannel();
+}
+
+void SftpChannelPrivate::handleExitSignal(const SshChannelExitSignal &signal)
+{
+    emit channelError(tr("The SFTP server crashed: %1.").arg(signal.error));
+    closeChannel(); // See above.
+}
+
+void SftpChannelPrivate::handleCurrentPacket()
+{
+    qCDebug(sshLog, "Handling SFTP packet of type %d", m_incomingPacket.type());
+    switch (m_incomingPacket.type()) {
+    case SSH_FXP_VERSION:
+        handleServerVersion();
+        break;
+    case SSH_FXP_HANDLE:
+        handleHandle();
+        break;
+    case SSH_FXP_NAME:
+        handleName();
+        break;
+    case SSH_FXP_STATUS:
+        handleStatus();
+        break;
+    case SSH_FXP_DATA:
+        handleReadData();
+        break;
+    case SSH_FXP_ATTRS:
+        handleAttrs();
+        break;
+    default:
+        throw SshServerException(SSH_DISCONNECT_PROTOCOL_ERROR,
+            "Unexpected packet.",
+            tr("Unexpected packet of type %1.").arg(m_incomingPacket.type()));
+    }
+}
+
+void SftpChannelPrivate::handleServerVersion()
+{
+    checkChannelActive();
+    if (m_sftpState != InitSent) {
+        throw SSH_SERVER_EXCEPTION(SSH_DISCONNECT_PROTOCOL_ERROR,
+            "Unexpected SSH_FXP_VERSION packet.");
+    }
+
+    qCDebug(sshLog, "sftp init received");
+    const quint32 serverVersion = m_incomingPacket.extractServerVersion();
+    if (serverVersion != ProtocolVersion) {
+        emit channelError(tr("Protocol version mismatch: Expected %1, got %2")
+            .arg(serverVersion).arg(ProtocolVersion));
+        closeChannel();
+    } else {
+        m_sftpState = Initialized;
+        emit initialized();
+    }
+}
+
+void SftpChannelPrivate::handleHandle()
+{
+    const SftpHandleResponse &response = m_incomingPacket.asHandleResponse();
+    JobMap::Iterator it = lookupJob(response.requestId);
+    const QSharedPointer<AbstractSftpOperationWithHandle> job
+        = it.value().dynamicCast<AbstractSftpOperationWithHandle>();
+    if (job.isNull()) {
+        throw SSH_SERVER_EXCEPTION(SSH_DISCONNECT_PROTOCOL_ERROR,
+            "Unexpected SSH_FXP_HANDLE packet.");
+    }
+    if (job->state != AbstractSftpOperationWithHandle::OpenRequested) {
+        throw SSH_SERVER_EXCEPTION(SSH_DISCONNECT_PROTOCOL_ERROR,
+            "Unexpected SSH_FXP_HANDLE packet.");
+    }
+    job->remoteHandle = response.handle;
+    job->state = AbstractSftpOperationWithHandle::Open;
+
+    switch (it.value()->type()) {
+    case AbstractSftpOperation::ListDir:
+        handleLsHandle(it);
+        break;
+    case AbstractSftpOperation::CreateFile:
+        handleCreateFileHandle(it);
+        break;
+    case AbstractSftpOperation::Download:
+        handleGetHandle(it);
+        break;
+    case AbstractSftpOperation::UploadFile:
+        handlePutHandle(it);
+        break;
+    default:
+        Q_ASSERT(!"Oh no, I forgot to handle an SFTP operation type!");
+    }
+}
+
+void SftpChannelPrivate::handleLsHandle(const JobMap::Iterator &it)
+{
+    SftpListDir::Ptr op = it.value().staticCast<SftpListDir>();
+    sendData(m_outgoingPacket.generateReadDir(op->remoteHandle,
+        op->jobId).rawData());
+}
+
+void SftpChannelPrivate::handleCreateFileHandle(const JobMap::Iterator &it)
+{
+    SftpCreateFile::Ptr op = it.value().staticCast<SftpCreateFile>();
+    sendData(m_outgoingPacket.generateCloseHandle(op->remoteHandle,
+        op->jobId).rawData());
+}
+
+void SftpChannelPrivate::handleGetHandle(const JobMap::Iterator &it)
+{
+    SftpDownload::Ptr op = it.value().staticCast<SftpDownload>();
+    sendData(m_outgoingPacket.generateFstat(op->remoteHandle,
+        op->jobId).rawData());
+    op->statRequested = true;
+}
+
+void SftpChannelPrivate::handlePutHandle(const JobMap::Iterator &it)
+{
+    SftpUploadFile::Ptr op = it.value().staticCast<SftpUploadFile>();
+    if (op->parentJob && op->parentJob->hasError)
+        sendTransferCloseHandle(op, it.key());
+
+    // OpenSSH does not implement the RFC's append functionality, so we
+    // have to emulate it.
+    if (op->mode == SftpAppendToExisting) {
+        sendData(m_outgoingPacket.generateFstat(op->remoteHandle,
+            op->jobId).rawData());
+        op->statRequested = true;
+    } else {
+        spawnWriteRequests(it);
+    }
+}
+
+void SftpChannelPrivate::handleStatus()
+{
+    const SftpStatusResponse &response = m_incomingPacket.asStatusResponse();
+    qCDebug(sshLog, "%s: status = %d", Q_FUNC_INFO, response.status);
+    JobMap::Iterator it = lookupJob(response.requestId);
+    switch (it.value()->type()) {
+    case AbstractSftpOperation::ListDir:
+        handleLsStatus(it, response);
+        break;
+    case AbstractSftpOperation::Download:
+        handleGetStatus(it, response);
+        break;
+    case AbstractSftpOperation::UploadFile:
+        handlePutStatus(it, response);
+        break;
+    case AbstractSftpOperation::MakeDir:
+        handleMkdirStatus(it, response);
+        break;
+    case AbstractSftpOperation::StatFile:
+    case AbstractSftpOperation::RmDir:
+    case AbstractSftpOperation::Rm:
+    case AbstractSftpOperation::Rename:
+    case AbstractSftpOperation::CreateFile:
+    case AbstractSftpOperation::CreateLink:
+        handleStatusGeneric(it, response);
+        break;
+    }
+}
+
+void SftpChannelPrivate::handleStatusGeneric(const JobMap::Iterator &it,
+    const SftpStatusResponse &response)
+{
+    AbstractSftpOperation::Ptr op = it.value();
+    const QString error = errorMessage(response, tr("Unknown error."));
+    emit finished(op->jobId, error);
+    m_jobs.erase(it);
+}
+
+void SftpChannelPrivate::handleMkdirStatus(const JobMap::Iterator &it,
+    const SftpStatusResponse &response)
+{
+    SftpMakeDir::Ptr op = it.value().staticCast<SftpMakeDir>();
+    QSharedPointer<SftpUploadDir> parentJob = op->parentJob;
+    if (parentJob == SftpUploadDir::Ptr()) {
+        handleStatusGeneric(it, response);
+        return;
+    }
+    if (parentJob->hasError) {
+        m_jobs.erase(it);
+        return;
+    }
+
+    typedef QMap<SftpMakeDir::Ptr, SftpUploadDir::Dir>::Iterator DirIt;
+    DirIt dirIt = parentJob->mkdirsInProgress.find(op);
+    Q_ASSERT(dirIt != parentJob->mkdirsInProgress.end());
+    const QString &remoteDir = dirIt.value().remoteDir;
+    if (response.status == SSH_FX_OK) {
+        emit dataAvailable(parentJob->jobId,
+            tr("Created remote directory \"%1\".").arg(remoteDir));
+    } else if (response.status == SSH_FX_FAILURE) {
+        emit dataAvailable(parentJob->jobId,
+            tr("Remote directory \"%1\" already exists.").arg(remoteDir));
+    } else {
+        parentJob->setError();
+        emit finished(parentJob->jobId,
+            tr("Error creating directory \"%1\": %2")
+            .arg(remoteDir, response.errorString));
+        m_jobs.erase(it);
+        return;
+    }
+
+    QDir localDir(dirIt.value().localDir);
+    const QFileInfoList &dirInfos
+        = localDir.entryInfoList(QDir::Dirs | QDir::NoDotAndDotDot);
+    foreach (const QFileInfo &dirInfo, dirInfos) {
+        const QString remoteSubDir = remoteDir + QLatin1Char('/') + dirInfo.fileName();
+        const SftpMakeDir::Ptr mkdirOp(
+            new SftpMakeDir(++m_nextJobId, remoteSubDir, parentJob));
+        parentJob->mkdirsInProgress.insert(mkdirOp,
+            SftpUploadDir::Dir(dirInfo.absoluteFilePath(), remoteSubDir));
+        createJob(mkdirOp);
+    }
+
+    const QFileInfoList &fileInfos = localDir.entryInfoList(QDir::Files);
+    foreach (const QFileInfo &fileInfo, fileInfos) {
+        QSharedPointer<QFile> localFile(new QFile(fileInfo.absoluteFilePath()));
+        if (!localFile->open(QIODevice::ReadOnly)) {
+            parentJob->setError();
+            emit finished(parentJob->jobId,
+                tr("Could not open local file \"%1\": %2")
+                .arg(fileInfo.absoluteFilePath(), localFile->errorString()));
+            m_jobs.erase(it);
+            return;
+        }
+
+        const QString remoteFilePath = remoteDir + QLatin1Char('/') + fileInfo.fileName();
+        SftpUploadFile::Ptr uploadFileOp(new SftpUploadFile(++m_nextJobId,
+            remoteFilePath, localFile, SftpOverwriteExisting, parentJob));
+        createJob(uploadFileOp);
+        parentJob->uploadsInProgress.append(uploadFileOp);
+    }
+
+    parentJob->mkdirsInProgress.erase(dirIt);
+    if (parentJob->mkdirsInProgress.isEmpty()
+        && parentJob->uploadsInProgress.isEmpty())
+        emit finished(parentJob->jobId);
+    m_jobs.erase(it);
+}
+
+void SftpChannelPrivate::handleLsStatus(const JobMap::Iterator &it,
+    const SftpStatusResponse &response)
+{
+    SftpListDir::Ptr op = it.value().staticCast<SftpListDir>();
+    switch (op->state) {
+    case SftpListDir::OpenRequested:
+        emit finished(op->jobId, errorMessage(response.errorString,
+            tr("Remote directory could not be opened for reading.")));
+        m_jobs.erase(it);
+        break;
+    case SftpListDir::Open:
+        if (response.status != SSH_FX_EOF)
+            reportRequestError(op, errorMessage(response.errorString,
+                tr("Failed to list remote directory contents.")));
+        op->state = SftpListDir::CloseRequested;
+        sendData(m_outgoingPacket.generateCloseHandle(op->remoteHandle,
+            op->jobId).rawData());
+        break;
+    case SftpListDir::CloseRequested:
+        if (!op->hasError) {
+            const QString error = errorMessage(response,
+                tr("Failed to close remote directory."));
+            emit finished(op->jobId, error);
+        }
+        m_jobs.erase(it);
+        break;
+    default:
+        throw SSH_SERVER_EXCEPTION(SSH_DISCONNECT_PROTOCOL_ERROR,
+            "Unexpected SSH_FXP_STATUS packet.");
+    }
+}
+
+void SftpChannelPrivate::handleGetStatus(const JobMap::Iterator &it,
+    const SftpStatusResponse &response)
+{
+    SftpDownload::Ptr op = it.value().staticCast<SftpDownload>();
+    switch (op->state) {
+    case SftpDownload::OpenRequested:
+        emit finished(op->jobId,
+            errorMessage(response.errorString,
+                tr("Failed to open remote file for reading.")));
+        m_jobs.erase(it);
+        break;
+    case SftpDownload::Open:
+        if (op->statRequested) {
+            reportRequestError(op, errorMessage(response.errorString,
+                tr("Failed to retrieve information on the remote file ('stat' failed).")));
+            sendTransferCloseHandle(op, response.requestId);
+        } else {
+            if ((response.status != SSH_FX_EOF || response.requestId != op->eofId)
+                && !op->hasError)
+                reportRequestError(op, errorMessage(response.errorString,
+                    tr("Failed to read remote file.")));
+            finishTransferRequest(it);
+        }
+        break;
+    case SftpDownload::CloseRequested:
+        Q_ASSERT(op->inFlightCount == 1);
+        if (!op->hasError) {
+            if (response.status == SSH_FX_OK)
+                emit finished(op->jobId);
+            else
+                reportRequestError(op, errorMessage(response.errorString,
+                    tr("Failed to close remote file.")));
+        }
+        removeTransferRequest(it);
+        break;
+    default:
+        throw SSH_SERVER_EXCEPTION(SSH_DISCONNECT_PROTOCOL_ERROR,
+            "Unexpected SSH_FXP_STATUS packet.");
+    }
+}
+
+void SftpChannelPrivate::handlePutStatus(const JobMap::Iterator &it,
+    const SftpStatusResponse &response)
+{
+    SftpUploadFile::Ptr job = it.value().staticCast<SftpUploadFile>();
+    switch (job->state) {
+    case SftpUploadFile::OpenRequested: {
+        bool emitError = false;
+        if (job->parentJob) {
+            if (!job->parentJob->hasError) {
+                job->parentJob->setError();
+                emitError = true;
+            }
+        } else {
+            emitError = true;
+        }
+
+        if (emitError) {
+            emit finished(job->jobId,
+                errorMessage(response.errorString,
+                    tr("Failed to open remote file for writing.")));
+        }
+        m_jobs.erase(it);
+        break;
+    }
+    case SftpUploadFile::Open:
+        if (job->hasError || (job->parentJob && job->parentJob->hasError)) {
+            job->hasError = true;
+            finishTransferRequest(it);
+            return;
+        }
+
+        if (response.status == SSH_FX_OK) {
+            sendWriteRequest(it);
+        } else {
+            if (job->parentJob)
+                job->parentJob->setError();
+            reportRequestError(job, errorMessage(response.errorString,
+                tr("Failed to write remote file.")));
+            finishTransferRequest(it);
+        }
+        break;
+    case SftpUploadFile::CloseRequested:
+        Q_ASSERT(job->inFlightCount == 1);
+        if (job->hasError || (job->parentJob && job->parentJob->hasError)) {
+            m_jobs.erase(it);
+            return;
+        }
+
+        if (response.status == SSH_FX_OK) {
+            if (job->parentJob) {
+                job->parentJob->uploadsInProgress.removeOne(job);
+                if (job->parentJob->mkdirsInProgress.isEmpty()
+                    && job->parentJob->uploadsInProgress.isEmpty())
+                    emit finished(job->parentJob->jobId);
+            } else {
+                emit finished(job->jobId);
+            }
+        } else {
+            const QString error = errorMessage(response.errorString,
+                tr("Failed to close remote file."));
+            if (job->parentJob) {
+                job->parentJob->setError();
+                emit finished(job->parentJob->jobId, error);
+            } else {
+                emit finished(job->jobId, error);
+            }
+        }
+        m_jobs.erase(it);
+        break;
+    default:
+        throw SSH_SERVER_EXCEPTION(SSH_DISCONNECT_PROTOCOL_ERROR,
+            "Unexpected SSH_FXP_STATUS packet.");
+    }
+}
+
+void SftpChannelPrivate::handleName()
+{
+    const SftpNameResponse &response = m_incomingPacket.asNameResponse();
+    JobMap::Iterator it = lookupJob(response.requestId);
+    switch (it.value()->type()) {
+    case AbstractSftpOperation::ListDir: {
+        SftpListDir::Ptr op = it.value().staticCast<SftpListDir>();
+        if (op->state != SftpListDir::Open) {
+            throw SSH_SERVER_EXCEPTION(SSH_DISCONNECT_PROTOCOL_ERROR,
+                "Unexpected SSH_FXP_NAME packet.");
+        }
+
+        QList<SftpFileInfo> fileInfoList;
+        for (int i = 0; i < response.files.count(); ++i) {
+            const SftpFile &file = response.files.at(i);
+
+            SftpFileInfo fileInfo;
+            fileInfo.name = file.fileName;
+            attributesToFileInfo(file.attributes, fileInfo);
+            fileInfoList << fileInfo;
+        }
+        emit fileInfoAvailable(op->jobId, fileInfoList);
+        sendData(m_outgoingPacket.generateReadDir(op->remoteHandle,
+            op->jobId).rawData());
+        break;
+    }
+    default:
+        throw SSH_SERVER_EXCEPTION(SSH_DISCONNECT_PROTOCOL_ERROR,
+            "Unexpected SSH_FXP_NAME packet.");
+    }
+}
+
+void SftpChannelPrivate::handleReadData()
+{
+    const SftpDataResponse &response = m_incomingPacket.asDataResponse();
+    JobMap::Iterator it = lookupJob(response.requestId);
+    if (it.value()->type() != AbstractSftpOperation::Download) {
+        throw SSH_SERVER_EXCEPTION(SSH_DISCONNECT_PROTOCOL_ERROR,
+            "Unexpected SSH_FXP_DATA packet.");
+    }
+
+    SftpDownload::Ptr op = it.value().staticCast<SftpDownload>();
+    if (op->hasError) {
+        finishTransferRequest(it);
+        return;
+    }
+
+    if (!op->localFile->seek(op->offsets[response.requestId])) {
+        reportRequestError(op, op->localFile->errorString());
+        finishTransferRequest(it);
+        return;
+    }
+
+    if (op->localFile->write(response.data) != response.data.size()) {
+        reportRequestError(op, op->localFile->errorString());
+        finishTransferRequest(it);
+        return;
+    }
+
+    if (op->offset >= op->fileSize && op->fileSize != 0)
+        finishTransferRequest(it);
+    else
+        sendReadRequest(op, response.requestId);
+}
+
+void SftpChannelPrivate::handleAttrs()
+{
+    const SftpAttrsResponse &response = m_incomingPacket.asAttrsResponse();
+    JobMap::Iterator it = lookupJob(response.requestId);
+
+    SftpStatFile::Ptr statOp = it.value().dynamicCast<SftpStatFile>();
+    if (statOp) {
+        SftpFileInfo fileInfo;
+        fileInfo.name = QFileInfo(statOp->path).fileName();
+        attributesToFileInfo(response.attrs, fileInfo);
+        emit fileInfoAvailable(it.key(), QList<SftpFileInfo>() << fileInfo);
+        emit finished(it.key());
+        m_jobs.erase(it);
+        return;
+    }
+
+    AbstractSftpTransfer::Ptr transfer
+        = it.value().dynamicCast<AbstractSftpTransfer>();
+    if (!transfer || transfer->state != AbstractSftpTransfer::Open
+        || !transfer->statRequested) {
+        throw SSH_SERVER_EXCEPTION(SSH_DISCONNECT_PROTOCOL_ERROR,
+            "Unexpected SSH_FXP_ATTRS packet.");
+    }
+    Q_ASSERT(transfer->type() == AbstractSftpOperation::UploadFile
+        || transfer->type() == AbstractSftpOperation::Download);
+
+    if (transfer->type() == AbstractSftpOperation::Download) {
+        SftpDownload::Ptr op = transfer.staticCast<SftpDownload>();
+        if (response.attrs.sizePresent) {
+            op->fileSize = response.attrs.size;
+        } else {
+            op->fileSize = 0;
+            op->eofId = op->jobId;
+        }
+        op->statRequested = false;
+        spawnReadRequests(op);
+    } else {
+        SftpUploadFile::Ptr op = transfer.staticCast<SftpUploadFile>();
+        if (op->parentJob && op->parentJob->hasError) {
+            op->hasError = true;
+            sendTransferCloseHandle(op, op->jobId);
+            return;
+        }
+
+        if (response.attrs.sizePresent) {
+            op->offset = response.attrs.size;
+            spawnWriteRequests(it);
+        } else {
+            if (op->parentJob)
+                op->parentJob->setError();
+            reportRequestError(op, tr("Cannot append to remote file: "
+                "Server does not support the file size attribute."));
+            sendTransferCloseHandle(op, op->jobId);
+        }
+    }
+}
+
+SftpChannelPrivate::JobMap::Iterator SftpChannelPrivate::lookupJob(SftpJobId id)
+{
+    JobMap::Iterator it = m_jobs.find(id);
+    if (it == m_jobs.end()) {
+        throw SSH_SERVER_EXCEPTION(SSH_DISCONNECT_PROTOCOL_ERROR,
+            "Invalid request id in SFTP packet.");
+    }
+    return it;
+}
+
+void SftpChannelPrivate::closeHook()
+{
+    for (JobMap::ConstIterator it = m_jobs.constBegin(); it != m_jobs.constEnd(); ++it)
+        emit finished(it.key(), tr("SFTP channel closed unexpectedly."));
+    m_jobs.clear();
+    m_incomingData.clear();
+    m_incomingPacket.clear();
+    emit closed();
+}
+
+void SftpChannelPrivate::handleOpenSuccessInternal()
+{
+    qCDebug(sshLog, "SFTP session started");
+    m_sendFacility.sendSftpPacket(remoteChannel());
+    m_sftpState = SubsystemRequested;
+}
+
+void SftpChannelPrivate::handleOpenFailureInternal(const QString &reason)
+{
+    if (channelState() != SessionRequested) {
+        throw SSH_SERVER_EXCEPTION(SSH_DISCONNECT_PROTOCOL_ERROR,
+            "Unexpected SSH_MSG_CHANNEL_OPEN_FAILURE packet.");
+    }
+    emit channelError(tr("Server could not start session: %1").arg(reason));
+}
+
+void SftpChannelPrivate::sendReadRequest(const SftpDownload::Ptr &job,
+    quint32 requestId)
+{
+    Q_ASSERT(job->eofId == SftpInvalidJob);
+    sendData(m_outgoingPacket.generateReadFile(job->remoteHandle, job->offset,
+        AbstractSftpPacket::MaxDataSize, requestId).rawData());
+    job->offsets[requestId] = job->offset;
+    job->offset += AbstractSftpPacket::MaxDataSize;
+    if (job->offset >= job->fileSize)
+        job->eofId = requestId;
+}
+
+void SftpChannelPrivate::reportRequestError(const AbstractSftpOperationWithHandle::Ptr &job,
+    const QString &error)
+{
+    emit finished(job->jobId, error);
+    job->hasError = true;
+}
+
+void SftpChannelPrivate::finishTransferRequest(const JobMap::Iterator &it)
+{
+    AbstractSftpTransfer::Ptr job = it.value().staticCast<AbstractSftpTransfer>();
+    if (job->inFlightCount == 1)
+        sendTransferCloseHandle(job, it.key());
+    else
+        removeTransferRequest(it);
+}
+
+void SftpChannelPrivate::sendTransferCloseHandle(const AbstractSftpTransfer::Ptr &job,
+    quint32 requestId)
+{
+    sendData(m_outgoingPacket.generateCloseHandle(job->remoteHandle,
+       requestId).rawData());
+    job->state = SftpDownload::CloseRequested;
+}
+
+void SftpChannelPrivate::attributesToFileInfo(const SftpFileAttributes &attributes,
+    SftpFileInfo &fileInfo) const
+{
+    if (attributes.sizePresent) {
+        fileInfo.sizeValid = true;
+        fileInfo.size = attributes.size;
+    }
+    if (attributes.permissionsPresent) {
+        if (attributes.permissions & 0x8000) // S_IFREG
+            fileInfo.type = FileTypeRegular;
+        else if (attributes.permissions & 0x4000) // S_IFDIR
+            fileInfo.type = FileTypeDirectory;
+        else
+            fileInfo.type = FileTypeOther;
+        fileInfo.permissionsValid = true;
+        fileInfo.permissions = 0;
+        if (attributes.permissions & 00001) // S_IXOTH
+            fileInfo.permissions |= QFile::ExeOther;
+        if (attributes.permissions & 00002) // S_IWOTH
+            fileInfo.permissions |= QFile::WriteOther;
+        if (attributes.permissions & 00004) // S_IROTH
+            fileInfo.permissions |= QFile::ReadOther;
+        if (attributes.permissions & 00010) // S_IXGRP
+            fileInfo.permissions |= QFile::ExeGroup;
+        if (attributes.permissions & 00020) // S_IWGRP
+            fileInfo.permissions |= QFile::WriteGroup;
+        if (attributes.permissions & 00040) // S_IRGRP
+            fileInfo.permissions |= QFile::ReadGroup;
+        if (attributes.permissions & 00100) // S_IXUSR
+            fileInfo.permissions |= QFile::ExeUser | QFile::ExeOwner;
+        if (attributes.permissions & 00200) // S_IWUSR
+            fileInfo.permissions |= QFile::WriteUser | QFile::WriteOwner;
+        if (attributes.permissions & 00400) // S_IRUSR
+            fileInfo.permissions |= QFile::ReadUser | QFile::ReadOwner;
+    }
+}
+
+void SftpChannelPrivate::removeTransferRequest(const JobMap::Iterator &it)
+{
+    --it.value().staticCast<AbstractSftpTransfer>()->inFlightCount;
+    m_jobs.erase(it);
+}
+
+void SftpChannelPrivate::sendWriteRequest(const JobMap::Iterator &it)
+{
+    SftpUploadFile::Ptr job = it.value().staticCast<SftpUploadFile>();
+    QByteArray data = job->localFile->read(AbstractSftpPacket::MaxDataSize);
+    if (job->localFile->error() != QFile::NoError) {
+        if (job->parentJob)
+            job->parentJob->setError();
+        reportRequestError(job, tr("Error reading local file: %1")
+            .arg(job->localFile->errorString()));
+        finishTransferRequest(it);
+    } else if (data.isEmpty()) {
+        finishTransferRequest(it);
+    } else {
+        sendData(m_outgoingPacket.generateWriteFile(job->remoteHandle,
+            job->offset, data, it.key()).rawData());
+        job->offset += AbstractSftpPacket::MaxDataSize;
+    }
+}
+
+void SftpChannelPrivate::spawnWriteRequests(const JobMap::Iterator &it)
+{
+    SftpUploadFile::Ptr op = it.value().staticCast<SftpUploadFile>();
+    op->calculateInFlightCount(AbstractSftpPacket::MaxDataSize);
+    sendWriteRequest(it);
+    for (int i = 1; !op->hasError && i < op->inFlightCount; ++i)
+        sendWriteRequest(m_jobs.insert(++m_nextJobId, op));
+}
+
+void SftpChannelPrivate::spawnReadRequests(const SftpDownload::Ptr &job)
+{
+    job->calculateInFlightCount(AbstractSftpPacket::MaxDataSize);
+    sendReadRequest(job, job->jobId);
+    for (int i = 1; i < job->inFlightCount; ++i) {
+        const quint32 requestId = ++m_nextJobId;
+        m_jobs.insert(requestId, job);
+        sendReadRequest(job, requestId);
+    }
+}
+
+} // namespace Internal
+} // namespace QSsh