Move SSH support into a dedicated library.

It does not belong into libUtils, which is a collection of small
unrelated utility classes.

Task-number: QTCREATORBUG-7218
Change-Id: Id92b9f28678afec93e6f07166adfde6550f38072
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>

1 files changed, 168 insertions, 0 deletions

diff --git a/src/libs/ssh/sshpacket.cpp b/src/libs/ssh/sshpacket.cpp
new file mode 100644
index 0000000000..3e6e408587
--- /dev/null
+++ b/src/libs/ssh/sshpacket.cpp
@@ -0,0 +1,168 @@
+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2012 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+**
+** GNU Lesser General Public License Usage
+**
+** 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.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** Other Usage
+**
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**************************************************************************/
+
+#include "sshpacket_p.h"
+
+#include "sshcapabilities_p.h"
+#include "sshcryptofacility_p.h"
+#include "sshexception_p.h"
+#include "sshpacketparser_p.h"
+
+#include <QDebug>
+
+#include <cctype>
+
+namespace QSsh {
+namespace Internal {
+
+const quint32 AbstractSshPacket::PaddingLengthOffset = 4;
+const quint32 AbstractSshPacket::PayloadOffset = PaddingLengthOffset + 1;
+const quint32 AbstractSshPacket::TypeOffset = PayloadOffset;
+const quint32 AbstractSshPacket::MinPaddingLength = 4;
+
+namespace {
+
+    void printByteArray(const QByteArray &data)
+    {
+#ifdef CREATOR_SSH_DEBUG
+        for (int i = 0; i < data.count(); ++i)
+            qDebug() << std::hex << (static_cast<unsigned int>(data[i]) & 0xff) << " ";
+#else
+        Q_UNUSED(data);
+#endif
+    }
+} // anonymous namespace
+
+
+AbstractSshPacket::AbstractSshPacket() : m_length(0) { }
+AbstractSshPacket::~AbstractSshPacket() {}
+
+bool AbstractSshPacket::isComplete() const
+{
+    if (currentDataSize() < minPacketSize())
+        return false;
+    Q_ASSERT(4 + length() + macLength() >= currentDataSize());
+    return 4 + length() + macLength() == currentDataSize();
+}
+
+void AbstractSshPacket::clear()
+{
+    m_data.clear();
+    m_length = 0;
+}
+
+SshPacketType AbstractSshPacket::type() const
+{
+    Q_ASSERT(isComplete());
+    return static_cast<SshPacketType>(m_data.at(TypeOffset));
+}
+
+QByteArray AbstractSshPacket::payLoad() const
+{
+    return QByteArray(m_data.constData() + PayloadOffset,
+        length() - paddingLength() - 1);
+}
+
+void AbstractSshPacket::printRawBytes() const
+{
+    printByteArray(m_data);
+}
+
+QByteArray AbstractSshPacket::encodeString(const QByteArray &string)
+{
+    QByteArray data;
+    data.resize(4);
+    data += string;
+    setLengthField(data);
+    return data;
+}
+
+QByteArray AbstractSshPacket::encodeMpInt(const Botan::BigInt &number)
+{
+    if (number.is_zero())
+        return QByteArray(4, 0);
+
+    int stringLength = number.bytes();
+    const bool positiveAndMsbSet = number.sign() == Botan::BigInt::Positive
+                                   && (number.byte_at(stringLength - 1) & 0x80);
+    if (positiveAndMsbSet)
+        ++stringLength;
+    QByteArray data;
+    data.resize(4 + stringLength);
+    int pos = 4;
+    if (positiveAndMsbSet)
+        data[pos++] = '\0';
+    number.binary_encode(reinterpret_cast<Botan::byte *>(data.data()) + pos);
+    setLengthField(data);
+    return data;
+}
+
+int AbstractSshPacket::paddingLength() const
+{
+    return m_data[PaddingLengthOffset];
+}
+
+quint32 AbstractSshPacket::length() const
+{
+    //Q_ASSERT(currentDataSize() >= minPacketSize());
+    if (m_length == 0)
+        calculateLength();
+    return m_length;
+}
+
+void AbstractSshPacket::calculateLength() const
+{
+    m_length = SshPacketParser::asUint32(m_data, static_cast<quint32>(0));
+}
+
+QByteArray AbstractSshPacket::generateMac(const SshAbstractCryptoFacility &crypt,
+    quint32 seqNr) const
+{
+    const quint32 seqNrBe = qToBigEndian(seqNr);
+    QByteArray data(reinterpret_cast<const char *>(&seqNrBe), sizeof seqNrBe);
+    data += QByteArray(m_data.constData(), length() + 4);
+    return crypt.generateMac(data, data.size());
+}
+
+quint32 AbstractSshPacket::minPacketSize() const
+{
+    return qMax<quint32>(cipherBlockSize(), 16) + macLength();
+}
+
+void AbstractSshPacket::setLengthField(QByteArray &data)
+{
+    const quint32 length = qToBigEndian(data.size() - 4);
+    data.replace(0, 4, reinterpret_cast<const char *>(&length), 4);
+}
+
+} // namespace Internal
+} // namespace QSsh