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248 | // Copyright (C) 2020-2023 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#ifndef CLIENT_HANDLER_H
#define CLIENT_HANDLER_H
#include <dhcp/pkt4.h>
#include <boost/noncopyable.hpp><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <boost/multi_index_container.hpp><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <boost/multi_index/composite_key.hpp><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <boost/multi_index/hashed_index.hpp><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <boost/multi_index/member.hpp><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <boost/shared_ptr.hpp><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <functional><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <mutex><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <thread><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
namespace isc {
namespace dhcp {
/// @brief Define the type of packet processing continuation.
typedef std::function<void()> Continuation;
/// @brief Define the type of shared pointers to continuations.
typedef boost::shared_ptr<Continuation> ContinuationPtr;
/// @brief Continuation factory.
///
/// @param cont Continuation rvalue.
inline ContinuationPtr makeContinuation(Continuation&& cont) {
return (boost::make_shared<Continuation>(cont));
}
/// @brief Client race avoidance RAII handler.
class ClientHandler : public boost::noncopyable {
private:
/// Class (aka static) types, methods and members.
/// @brief Structure representing a client.
struct Client {
/// @brief Constructor.
///
/// @param query The query.
/// @param client_id The client ID.
/// @param hwaddr The hardware address.
/// @throw if the query is null or client_id and hwaddr are null.
Client(Pkt4Ptr query, ClientIdPtr client_id, HWAddrPtr hwaddr);
/// @brief The query being processed.
Pkt4Ptr query_;
/// @brief Cached binary client ID.
std::vector<uint8_t> client_id_;
/// @brief Cached hardware type.
uint16_t htype_;
/// @brief Cached binary hardware address.
std::vector<uint8_t> hwaddr_;
/// @brief The ID of the thread processing the query.
std::thread::id thread_;
/// @brief The next query.
///
/// @note This field can be modified from another handler
/// holding the mutex.
Pkt4Ptr next_query_;
/// @brief The continuation to process next query for the client.
///
/// @note This field can be modified from another handler
/// holding the mutex.
ContinuationPtr cont_;
};
/// @brief The type of shared pointers to clients.
typedef boost::shared_ptr<Client> ClientPtr;
/// @brief The type of the client-by-id container.
typedef boost::multi_index_container<
// This container stores pointers to client-by-id objects.
ClientPtr,
// Start specification of indexes here.
boost::multi_index::indexed_by<
// First index is used to search by Duid.
boost::multi_index::hashed_unique<
// Client ID binary content as a member of the Client object.
boost::multi_index::member<
Client, std::vector<uint8_t>, &Client::client_id_
>
>
>
> ClientByIdContainer;
/// @brief The type of the client-by-hwaddr container.
typedef boost::multi_index_container<
// This container stores pointers to client-by-hwaddr objects.
ClientPtr,
// Start specification of indexes here.
boost::multi_index::indexed_by<
// First index is used to search by HWAddr.
boost::multi_index::hashed_unique<
// This is a composite index for type and binary components.
boost::multi_index::composite_key<
Client,
boost::multi_index::member<
Client, uint16_t, &Client::htype_
>,
boost::multi_index::member<
Client, std::vector<uint8_t>, &Client::hwaddr_
>
>
>
>
> ClientByHWAddrContainer;
/// @brief Lookup a client by id.
///
/// The mutex must be held by the caller.
///
/// @param client_id The duid of the query from the client.
/// @return The client found in the by client id container or null.
static ClientPtr lookup(const ClientIdPtr& client_id);
/// @brief Lookup a client by hwaddr.
///
/// The mutex must be held by the caller.
///
/// @param hwaddr The hardware address of the query from the client.
/// @return The client found in the by hardware address container or null.
static ClientPtr lookup(const HWAddrPtr& hwaddr);
/// @brief Add a client by id.
///
/// The mutex must be held by the caller.
///
/// @param client The client to insert into the by id client container.
static void addById(const ClientPtr& client);
/// @brief Add a client by hwaddr.
///
/// The mutex must be held by the caller.
///
/// @param client The client to insert into the by hwaddr client container.
static void addByHWAddr(const ClientPtr& client);
/// @brief Delete a client by id.
///
/// The mutex must be held by the caller.
///
/// @param client_id The duid to delete from the by id client container.
static void del(const ClientIdPtr& client_id);
/// @brief Delete a client by hwaddr.
///
/// The mutex must be held by the caller.
///
/// @param hwaddr The hwaddr to delete from the by hwaddr client container.
static void del(const HWAddrPtr& hwaddr);
/// @brief Mutex to protect client containers.
///
/// The mutex is used only by public methods for guards.
static std::mutex mutex_;
/// @brief The client-by-id container.
static ClientByIdContainer clients_client_id_;
/// @brief The client-by-hwaddr container.
static ClientByHWAddrContainer clients_hwaddr_;
public:
/// Public interface.
/// @brief Constructor.
ClientHandler();
/// @brief Destructor.
///
/// Releases the client if it was acquired.
virtual ~ClientHandler();
/// @brief Tries to acquires a client.
///
/// Lookup the client:
/// - if not found insert the client in the clients map and return true
/// - if found, if has a continuation put it in the holder,
/// and return false
///
/// @param query The query from the client.
/// @param cont The continuation in the case the client was held.
/// @return true if the client was acquired, false if there is already
/// a query from the same client.
bool tryLock(Pkt4Ptr query, ContinuationPtr cont = ContinuationPtr());
private:
/// Instance methods and members.
/// @brief Acquire a client by client ID option.
///
/// The mutex must be held by the caller.
void lockById();
/// @brief Acquire a client by hardware address.
///
/// The mutex must be held by the caller.
void lockByHWAddr();
/// @brief Release a client by client ID option.
///
/// The mutex must be held by the caller.
void unLockById();
/// @brief Release a client by hardware address.
///
/// The mutex must be held by the caller.
void unLockByHWAddr();
/// @brief Local client.
ClientPtr client_;
/// @brief Client ID locked by this handler.
ClientIdPtr locked_client_id_;
/// @brief Hardware address locked by this handler.
HWAddrPtr locked_hwaddr_;
};
} // namespace isc
} // namespace dhcp
#endif // CLIENT_HANDLER_H
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