/*
 * GSSAPIAuthRequestHandler.h
 *
 * Copyright (C) 2008 Matthias Schiffer <matthias@gamezock.de>
 *
 * This program 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 3 of the License, or
 * (at your option) any later version.
 *
 * 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/>.
 */

#ifndef MAD_CORE_REQUESTHANDLER_GSSAPIAUTHREQUESTHANDLER_H_
#define MAD_CORE_REQUESTHANDLER_GSSAPIAUTHREQUESTHANDLER_H_

#include <Common/RequestHandler.h>
#include <Net/Packet.h>
#include <cstring>
#include <gssapi/gssapi.h>

#include <iostream>

namespace Mad {
namespace Core {
namespace RequestHandler {

class GSSAPIAuthRequestHandler : public Common::RequestHandler {
  private:
    gss_ctx_id_t gssContext;

    bool gssContinue;

  public:
    GSSAPIAuthRequestHandler() : gssContext(GSS_C_NO_CONTEXT), gssContinue(true) {}

    virtual bool handlePacket(Net::Connection *connection, const Net::Packet &packet) {
      if(isFinished())
        return false;

      if(packet.getType() != Net::Packet::TYPE_GSSAPI_AUTH)
        return false; // TODO Logging

      OM_uint32 majStat, minStat;
      gss_buffer_desc recvBuffer, sendBuffer;

      if(gssContinue) {
        recvBuffer.length = packet.getLength();
        recvBuffer.value = std::malloc(recvBuffer.length);
        std::memcpy(recvBuffer.value, packet.getData(), recvBuffer.length);

        majStat = gss_accept_sec_context(&minStat, &gssContext, GSS_C_NO_CREDENTIAL, &recvBuffer, GSS_C_NO_CHANNEL_BINDINGS, NULL, NULL, &sendBuffer, NULL, NULL, NULL);

        std::free(recvBuffer.value);

        if(majStat == GSS_S_COMPLETE) {
          std::cout << "GSS context established." << std::endl;
          gssContinue = false;
        }
        else if(majStat != GSS_S_CONTINUE_NEEDED) {
          gss_release_buffer(&minStat, &sendBuffer);
          return false;
        }

        if(!connection->send(Net::Packet(Net::Packet::TYPE_GSSAPI_AUTH, packet.getRequestId(), sendBuffer.value, sendBuffer.length))) {
          gss_release_buffer(&minStat, &sendBuffer);
          return false;
        }

        gss_release_buffer(&minStat, &sendBuffer);
      }
      else {
        return false;

        //setFinished();
      }

      return true;
    }
};

}
}
}

#endif /* MAD_CORE_REQUESTHANDLER_GSSAPIAUTHREQUESTHANDLER_H_ */