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/*
* 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.
*
*/
#include <string.h>
#include <tins/offline_packet_filter.h>
#include <tins/pdu.h>
#include <tins/exceptions.h>
using std::string;
namespace Tins {
OfflinePacketFilter::OfflinePacketFilter(const OfflinePacketFilter& other) {
string_filter_ = other.string_filter_;
init(string_filter_, pcap_datalink(other.handle_), pcap_snapshot(other.handle_));
}
OfflinePacketFilter& OfflinePacketFilter::operator=(const OfflinePacketFilter& other) {
string_filter_ = other.string_filter_;
pcap_freecode(&filter_);
pcap_close(handle_);
init(string_filter_, pcap_datalink(other.handle_), pcap_snapshot(other.handle_));
return* this;
}
OfflinePacketFilter::~OfflinePacketFilter() {
pcap_freecode(&filter_);
pcap_close(handle_);
}
void OfflinePacketFilter::init(const string& pcap_filter,
int link_type,
unsigned int snap_len) {
handle_ = pcap_open_dead(
link_type,
snap_len
);
if (!handle_) {
throw pcap_open_failed();
}
if (pcap_compile(handle_, &filter_, pcap_filter.c_str(), 1, 0xffffffff) == -1) {
string error(pcap_geterr(handle_));
pcap_freecode(&filter_);
pcap_close(handle_);
throw invalid_pcap_filter(error.c_str());
}
}
bool OfflinePacketFilter::matches_filter(const uint8_t* buffer, uint32_t total_sz) const {
pcap_pkthdr header;
memset(&header, 0, sizeof(header));
header.len = total_sz;
header.caplen = total_sz;
return pcap_offline_filter(&filter_, &header, buffer) != 0;
}
bool OfflinePacketFilter::matches_filter(PDU& pdu) const {
PDU::serialization_type buffer = pdu.serialize();
return matches_filter(&buffer[0], static_cast<uint32_t>(buffer.size()));
}
} // Tins
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