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/******************************************************************************
*
* Copyright (C) 2002 Hugo PEREIRA <mailto: hugo.pereira@free.fr>
*
* This is free software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any later
* version.
*
* This software is distributed in the hope that it will be useful, but WITHOUT
* Any WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*
*******************************************************************************/
#include "SshBaseSocket.h"
#include "Debug.h"
#include <QElapsedTimer>
#if HAVE_SSH
#include <libssh2.h>
#endif
namespace Ssh
{
//_______________________________________________________________________
BaseSocket::BaseSocket( QObject* parent ):
QIODevice( parent ),
Counter( "Ssh::BaseSocket" )
{ buffer_.resize( maxSize_ ); }
//_______________________________________________________________________
BaseSocket::~BaseSocket()
{ close(); }
//_______________________________________________________________________
bool BaseSocket::atEnd() const
{
// check channel
if( !isConnected() ) return true;
#if HAVE_SSH
return libssh2_channel_eof( reinterpret_cast<LIBSSH2_CHANNEL*>(channel_) );
#else
return true;
#endif
}
//_______________________________________________________________________
void BaseSocket::close()
{
Debug::Throw( "Ssh::BaseSocket:close.\n" );
// stop timer
if( timer_.isActive() ) timer_.stop();
#if HAVE_SSH
// close channel
if( isConnected() )
{
auto channel = reinterpret_cast<LIBSSH2_CHANNEL*>(channel_);
libssh2_channel_close( channel );
libssh2_channel_free( channel );
channel_ = nullptr;
}
#endif
}
//_______________________________________________________________________
qint64 BaseSocket::readData( char* data, qint64 maxSize )
{
if( !( openMode() & QIODevice::ReadOnly ) )
{
setErrorString( tr( "Socket is writeOnly" ) );
return -1;
}
if( bytesAvailable_ <= 0 ) return bytesAvailable_;
const qint64 bytesRead = qMin( maxSize, bytesAvailable_ );
memcpy( data, buffer_.data(), bytesRead );
buffer_ = buffer_.mid( bytesRead );
buffer_.resize( maxSize_ );
bytesAvailable_ -= bytesRead;
return bytesRead;
}
//_______________________________________________________________________
qint64 BaseSocket::writeData( const char* data, qint64 maxSize )
{
if( !(openMode() & QIODevice::WriteOnly) )
{
setErrorString( tr( "Socket is readOnly" ) );
return -1;
}
if( !isConnected() ) return -1;
#if HAVE_SSH
qint64 bytesWritten = 0;
LIBSSH2_CHANNEL* channel = reinterpret_cast<LIBSSH2_CHANNEL*>(channel_);
while( bytesWritten < maxSize )
{
const qint64 i = libssh2_channel_write( channel, data + bytesWritten, maxSize - bytesWritten );
if( i >= 0 ) bytesWritten += i;
else if( i != LIBSSH2_ERROR_EAGAIN )
{
setErrorString( tr( "invalid write: %1" ).arg( i ) );
return -1;
}
}
return bytesWritten;
#else
setErrorString( "invalid channel" );
return -1;
#endif
}
//_______________________________________________________________________
void BaseSocket::timerEvent( QTimerEvent* event )
{
// check timer id
if( event->timerId() != timer_.timerId() ) return QIODevice::timerEvent( event );
#if HAVE_SSH
if( isConnected() ) _tryRead();
return;
#else
timer_.stop();
bytesAvailable_ = -1;
setErrorString( "no ssh" );
return;
#endif
}
//_______________________________________________________________________
void BaseSocket::_setChannel( void* channel, QIODevice::OpenMode openMode )
{
// close existing channel if any
if( isConnected() ) close();
// stop timer
if( timer_.isActive() ) timer_.stop();
// assign open mode
setOpenMode( openMode );
// assign new channel
channel_ = channel;
if( isConnected() )
{
// start timer
if( openMode&QIODevice::ReadOnly ) timer_.start( latency_, this );
// emit signal
emit connected();
}
}
//_______________________________________________________________________
bool BaseSocket::_tryRead()
{
if( !isConnected() ) return false;
#if HAVE_SSH
// read from channel
LIBSSH2_CHANNEL* channel = reinterpret_cast<LIBSSH2_CHANNEL*>(channel_);
qint64 length = libssh2_channel_read( channel, buffer_.data()+bytesAvailable_, maxSize_-bytesAvailable_ );
if( length == LIBSSH2_ERROR_EAGAIN ) return false ;
else if( length < 0 )
{
setErrorString( tr( "invalid read: %1" ).arg( length ) );
timer_.stop();
bytesAvailable_ = -1;
return false;
} else {
bytesAvailable_ += length;
emit readyRead();
}
// check at end
if( atEnd() )
{
timer_.stop();
setErrorString( "channel closed" );
emit readChannelFinished();
}
return true;
#else
return false;
#endif
}
}
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