offline_packet_filter.h

/*
 * Copyright (c) 2017, Matias Fontanini
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following disclaimer
 *   in the documentation and/or other materials provided with the
 *   distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#ifndef TINS_OFFLINE_PACKET_FILTER_H
#define TINS_OFFLINE_PACKET_FILTER_H

#include <string>
#include <stdint.h>
#include <tins/macros.h>

#ifdef TINS_HAVE_PCAP

#include <tins/data_link_type.h>

namespace Tins {

class PDU;

class TINS_API OfflinePacketFilter {
public:
    template<typename T>
    OfflinePacketFilter(const std::string& filter, 
                        const DataLinkType<T>& lt,
                        unsigned int snap_len = 65535)
    : string_filter_(filter) {
        init(filter, lt.get_type(), snap_len);
    }

    OfflinePacketFilter(const OfflinePacketFilter& other);

    OfflinePacketFilter& operator=(const OfflinePacketFilter& other);

    ~OfflinePacketFilter();

     bool matches_filter(const uint8_t* buffer, uint32_t total_sz) const;

     bool matches_filter(PDU& pdu) const;
private:
    void init(const std::string& pcap_filter, int link_type, 
        unsigned int snap_len);


    pcap_t* handle_;
    mutable bpf_program filter_;
    std::string string_filter_;
};

} // Tins

#endif // TINS_HAVE_PCAP

#endif // TINS_OFFLINE_PACKET_FILTER_H