mirror of
https://github.com/mfontanini/libtins
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120 lines
4.1 KiB
C++
120 lines
4.1 KiB
C++
/*
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* Copyright (c) 2014, Matias Fontanini
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifdef TINS_DEBUG
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#include <cassert>
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#endif // TINS_DEBUG
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#include <algorithm>
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#include <cstring>
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#include <pcap.h>
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#include "dot11/dot11_base.h"
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#include "dot3.h"
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#include "ethernetII.h"
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#include "radiotap.h"
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#include "loopback.h"
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#include "sll.h"
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#include "ppi.h"
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#include "internals.h"
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#include "exceptions.h"
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#include "memory_helpers.h"
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using Tins::Memory::InputMemoryStream;
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namespace Tins {
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PPI::PPI(const uint8_t *buffer, uint32_t total_sz) {
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InputMemoryStream stream(buffer, total_sz);
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stream.read(_header);
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if (length() > total_sz || length() < sizeof(_header)) {
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throw malformed_packet();
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}
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// There are some options
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const size_t options_length = length() - sizeof(_header);
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if (options_length > 0) {
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_data.assign(stream.pointer(), stream.pointer() + options_length);
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stream.skip(options_length);
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}
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if (stream) {
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switch (dlt()) {
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case DLT_IEEE802_11:
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#ifdef HAVE_DOT11
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parse_80211(stream.pointer(), stream.size());
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#else
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throw protocol_disabled();
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#endif
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break;
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case DLT_EN10MB:
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if(Internals::is_dot3(stream.pointer(), stream.size()))
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inner_pdu(new Dot3(stream.pointer(), stream.size()));
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else
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inner_pdu(new EthernetII(stream.pointer(), stream.size()));
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break;
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case DLT_IEEE802_11_RADIO:
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#ifdef HAVE_DOT11
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inner_pdu(new RadioTap(stream.pointer(), stream.size()));
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#else
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throw protocol_disabled();
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#endif
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break;
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case DLT_NULL:
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inner_pdu(new Loopback(stream.pointer(), stream.size()));
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break;
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case DLT_LINUX_SLL:
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inner_pdu(new Tins::SLL(stream.pointer(), stream.size()));
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break;
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}
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}
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}
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uint32_t PPI::header_size() const {
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return static_cast<uint32_t>(sizeof(_header) + _data.size());
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}
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void PPI::write_serialization(uint8_t *buffer, uint32_t total_sz, const PDU *) {
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throw std::runtime_error("PPI serialization not supported");
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}
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void PPI::parse_80211(const uint8_t* buffer, uint32_t total_sz) {
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#ifdef HAVE_DOT11
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if (_data.size() >= 13) {
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// Is FCS-at-end on?
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if ((_data[12] & 1) == 1) {
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// We need to reduce the total size since we're skipping the FCS
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if (total_sz < sizeof(uint32_t)) {
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throw malformed_packet();
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}
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total_sz -= sizeof(uint32_t);
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}
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}
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inner_pdu(Dot11::from_bytes(buffer, total_sz));
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#endif // HAVE_DOT11
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}
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} // Tins
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