Replace SSH library.

src/plugins/coreplugin/ssh/sshchannel.cpp

@@ -0,0 +1,244 @@
+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** Commercial Usage
+**
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Nokia.
+**
+** GNU Lesser General Public License Usage
+**
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://qt.nokia.com/contact.
+**
+**************************************************************************/
+
+#include "sshchannel_p.h"
+
+#include "sshincomingpacket_p.h"
+#include "sshsendfacility_p.h"
+
+#include <botan/exceptn.h>
+
+namespace Core {
+namespace Internal {
+
+namespace {
+    const quint32 MinMaxPacketSize = 32768;
+    const quint32 MaxPacketSize = 16 * 1024 * 1024;
+    const quint32 InitialWindowSize = MaxPacketSize;
+    const quint32 NoChannel = 0xffffffffu;
+} // anonymous namespace
+
+AbstractSshChannel::AbstractSshChannel(quint32 channelId,
+    SshSendFacility &sendFacility)
+    : m_sendFacility(sendFacility), m_localChannel(channelId),
+      m_remoteChannel(NoChannel), m_localWindowSize(InitialWindowSize),
+      m_remoteWindowSize(0), m_state(Inactive)
+{
+}
+
+AbstractSshChannel::~AbstractSshChannel()
+{
+
+}
+
+void AbstractSshChannel::setChannelState(ChannelState state)
+{
+    m_state = state;
+    if (state == Closed)
+        closeHook();
+}
+
+void AbstractSshChannel::requestSessionStart()
+{
+    // Note: We are just being paranoid here about the Botan exceptions,
+    // which are extremely unlikely to happen, because if there was a problem
+    // with our cryptography stuff, it would have hit us before, on
+    // establishing the connection.
+    try {
+        m_sendFacility.sendSessionPacket(m_localChannel, InitialWindowSize,
+            MaxPacketSize);
+        setChannelState(SessionRequested);
+    }  catch (Botan::Exception &e) {
+        m_errorString = QString::fromAscii(e.what());
+        closeChannel();
+    }
+}
+
+void AbstractSshChannel::sendData(const QByteArray &data)
+{
+    try {
+        m_sendBuffer += data;
+        flushSendBuffer();
+    }  catch (Botan::Exception &e) {
+        m_errorString = QString::fromAscii(e.what());
+        closeChannel();
+    }
+}
+
+void AbstractSshChannel::handleWindowAdjust(quint32 bytesToAdd)
+{
+    checkChannelActive();
+
+    const quint64 newValue = m_remoteWindowSize + bytesToAdd;
+    if (newValue > 0xffffffffu) {
+        throw SSH_SERVER_EXCEPTION(SSH_DISCONNECT_PROTOCOL_ERROR,
+            "Illegal window size requested.");
+    }
+
+    m_remoteWindowSize = newValue;
+    flushSendBuffer();
+}
+
+void AbstractSshChannel::flushSendBuffer()
+{
+    const quint32 bytesToSend
+        = qMin<quint32>(m_remoteWindowSize, m_sendBuffer.size());
+    if (bytesToSend > 0) {
+        const QByteArray &data = m_sendBuffer.left(bytesToSend);
+        m_sendFacility.sendChannelDataPacket(m_remoteChannel, data);
+        m_sendBuffer.remove(0, bytesToSend);
+        m_remoteWindowSize -= bytesToSend;
+    }
+}
+
+void AbstractSshChannel::handleOpenSuccess(quint32 remoteChannelId,
+    quint32 remoteWindowSize, quint32 remoteMaxPacketSize)
+{
+    if (m_state != SessionRequested) {
+       throw SSH_SERVER_EXCEPTION(SSH_DISCONNECT_PROTOCOL_ERROR,
+           "Invalid SSH_MSG_CHANNEL_OPEN_CONFIRMATION packet.");
+   }
+
+   if (remoteMaxPacketSize < MinMaxPacketSize) {
+       throw SSH_SERVER_EXCEPTION(SSH_DISCONNECT_PROTOCOL_ERROR,
+           "Maximum packet size too low.");
+   }
+
+#ifdef CREATOR_SSH_DEBUG
+   qDebug("Channel opened. remote channel id: %u, remote window size: %u, "
+       "remote max packet size: %u",
+       remoteChannelId, remoteWindowSize, remoteMaxPacketSize);
+#endif
+   m_remoteChannel = remoteChannelId;
+   m_remoteWindowSize = remoteWindowSize;
+   m_remoteMaxPacketSize = remoteMaxPacketSize;
+   setChannelState(SessionEstablished);
+   handleOpenSuccessInternal();
+}
+
+void AbstractSshChannel::handleOpenFailure(const QString &reason)
+{
+    if (m_state != SessionRequested) {
+       throw SSH_SERVER_EXCEPTION(SSH_DISCONNECT_PROTOCOL_ERROR,
+           "Invalid SSH_MSG_CHANNEL_OPEN_FAILURE packet.");
+   }
+
+#ifdef CREATOR_SSH_DEBUG
+   qDebug("Channel open request failed for channel %u", m_localChannel);
+#endif
+   m_errorString = reason;
+   handleOpenFailureInternal();
+}
+
+void AbstractSshChannel::handleChannelEof()
+{
+    if (m_state == Inactive || m_state == Closed) {
+        throw SSH_SERVER_EXCEPTION(SSH_DISCONNECT_PROTOCOL_ERROR,
+            "Unexpected SSH_MSG_CHANNEL_EOF message.");
+    }
+    m_localWindowSize = 0;
+}
+
+void AbstractSshChannel::handleChannelClose()
+{
+#ifdef CREATOR_SSH_DEBUG
+    qDebug("Receiving CLOSE for channel %u", m_localChannel);
+#endif
+    if (channelState() == Inactive || channelState() == Closed) {
+        throw SSH_SERVER_EXCEPTION(SSH_DISCONNECT_PROTOCOL_ERROR,
+            "Unexpected SSH_MSG_CHANNEL_CLOSE message.");
+    }
+    closeChannel();
+    setChannelState(Closed);
+}
+
+void AbstractSshChannel::handleChannelData(const QByteArray &data)
+{
+    const int bytesToDeliver = handleChannelOrExtendedChannelData(data);
+    handleChannelDataInternal(bytesToDeliver == data.size()
+        ? data : data.left(bytesToDeliver));
+}
+
+void AbstractSshChannel::handleChannelExtendedData(quint32 type, const QByteArray &data)
+{
+    const int bytesToDeliver = handleChannelOrExtendedChannelData(data);
+    handleChannelExtendedDataInternal(type, bytesToDeliver == data.size()
+        ? data : data.left(bytesToDeliver));
+}
+
+void AbstractSshChannel::handleChannelRequest(const SshIncomingPacket &packet)
+{
+    qWarning("Ignoring unknown request type '%s'",
+        packet.extractChannelRequestType().data());
+}
+
+int AbstractSshChannel::handleChannelOrExtendedChannelData(const QByteArray &data)
+{
+    checkChannelActive();
+
+    const int bytesToDeliver = qMin<quint32>(data.size(), maxDataSize());
+    if (bytesToDeliver != data.size())
+        qWarning("Misbehaving server does not respect local window, clipping.");
+
+    m_localWindowSize -= bytesToDeliver;
+    if (m_localWindowSize < MaxPacketSize) {
+        m_localWindowSize += MaxPacketSize;
+        m_sendFacility.sendWindowAdjustPacket(m_remoteChannel,
+            MaxPacketSize);
+    }
+    return bytesToDeliver;
+}
+
+void AbstractSshChannel::closeChannel()
+{
+    if (m_state != CloseRequested && m_state != Closed) {
+        if (m_state == Inactive) {
+            setChannelState(Closed);
+        } else {
+            setChannelState(CloseRequested);
+            m_sendFacility.sendChannelEofPacket(m_remoteChannel);
+            m_sendFacility.sendChannelClosePacket(m_remoteChannel);
+        }
+    }
+}
+
+void AbstractSshChannel::checkChannelActive()
+{
+    if (channelState() == Inactive || channelState() == Closed)
+        throw SSH_SERVER_EXCEPTION(SSH_DISCONNECT_PROTOCOL_ERROR,
+            "Channel not open.");
+}
+
+quint32 AbstractSshChannel::maxDataSize() const
+{
+    return qMin(m_localWindowSize, MaxPacketSize);
+}
+
+} // namespace Internal
+} // namespace Core