ComContext.cpp

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/* 
 * Confdump-Agent - Dump static and runtime system configuration
 * Copyright (C) 2009-2012  Straton IT, SAS
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3 as
 * published by the Free Software Foundation.
 * 
 * This program 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 <comdef.h>
#include <string>
#include <sstream>

#include "Confdump/System/Wmi/ComContext.hpp"
#include "Confdump/System/Wmi/errors.hpp"

namespace Confdump
{
namespace System
{
namespace Wmi
{

boost::weak_ptr<ComContext::GuardImpl> ComContext::instance_;

ComContext::Guard ComContext::getGuard()
{
    Guard guard = instance_.lock();
    if ( !guard )
    {
        guard.reset( new GuardImpl );
        instance_ = guard;
    }

    return guard;
}

ComContext::ComContext()
{
}

ComContext::~ComContext()
{
}




ComContext::GuardImpl::GuardImpl()
{
        HRESULT hr = CoInitializeEx( 0, COINIT_MULTITHREADED );
    throwOnComError( hr, "initialize the COM library" );
    comInitGuard_.reset( static_cast<void*>( 0 ), boost::bind( CoUninitialize ) );
    
    hr = CoInitializeSecurity(
        0,                                                              /* Security descriptor */
        -1,                             /* COM negotiates authentication service */
        0,                                                              /* Authentication services */
        0,                                                              /* Reserved */
        RPC_C_AUTHN_LEVEL_DEFAULT,      /* Default authentication level for proxies */
        RPC_C_IMP_LEVEL_IMPERSONATE,    /* Default Impersonation level for proxies  */
        0,                                                              /* Authentication info */
        EOAC_NONE,                                              /* Additional capabilities of the client or server */
        0 );                                                    /* Reserved */
    throwOnComError( hr, "configure the COM security" );
}

ComContext::GuardImpl::~GuardImpl()
{
}

}
}
}