pkt_filter.h

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// Copyright (C) 2013-2017 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 PKT_FILTER_H
#define PKT_FILTER_H

#include <dhcp/pkt4.h>
#include <asiolink/io_address.h>
#include <boost/shared_ptr.hpp>

namespace isc {
namespace dhcp {

class InvalidPacketFilter : public Exception {
public:
    InvalidPacketFilter(const char* file, size_t line, const char* what) :
        isc::Exception(file, line, what) { };
};

struct SocketInfo;

class Iface;

class PktFilter {
public:

    virtual ~PktFilter() { }

    virtual bool isDirectResponseSupported() const = 0;

    virtual SocketInfo openSocket(Iface& iface,
                                  const isc::asiolink::IOAddress& addr,
                                  const uint16_t port,
                                  const bool receive_bcast,
                                  const bool send_bcast) = 0;

    virtual Pkt4Ptr receive(Iface& iface,
                            const SocketInfo& socket_info) = 0;

    virtual int send(const Iface& iface, uint16_t sockfd,
                     const Pkt4Ptr& pkt) = 0;

protected:

    virtual int openFallbackSocket(const isc::asiolink::IOAddress& addr,
                                   const uint16_t port);
};

typedef boost::shared_ptr<PktFilter> PktFilterPtr;

} // namespace isc::dhcp
} // namespace isc

#endif // PKT_FILTER_H