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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 <cstring>
#include <pcap.h>
#include <tins/dot11/dot11_base.h>
#include <tins/dot3.h>
#include <tins/ethernetII.h>
#include <tins/radiotap.h>
#include <tins/loopback.h>
#include <tins/sll.h>
#include <tins/ppi.h>
#include <tins/exceptions.h>
#include <tins/memory_helpers.h>
#include <tins/detail/pdu_helpers.h>
using Tins::Memory::InputMemoryStream;
namespace Tins {
PPI::PPI(const uint8_t* buffer, uint32_t total_sz) {
InputMemoryStream stream(buffer, total_sz);
stream.read(header_);
if (length() > total_sz || length() < sizeof(header_)) {
throw malformed_packet();
}
// There are some options
const size_t options_length = length() - sizeof(header_);
if (options_length > 0) {
stream.read(data_, options_length);
}
if (stream) {
switch (dlt()) {
case DLT_IEEE802_11:
#ifdef TINS_HAVE_DOT11
parse_80211(stream.pointer(), stream.size());
#else
throw protocol_disabled();
#endif
break;
case DLT_EN10MB:
if (Internals::is_dot3(stream.pointer(), stream.size())) {
inner_pdu(new Dot3(stream.pointer(), stream.size()));
}
else {
inner_pdu(new EthernetII(stream.pointer(), stream.size()));
}
break;
case DLT_IEEE802_11_RADIO:
#ifdef TINS_HAVE_DOT11
inner_pdu(new RadioTap(stream.pointer(), stream.size()));
#else
throw protocol_disabled();
#endif
break;
case DLT_NULL:
inner_pdu(new Loopback(stream.pointer(), stream.size()));
break;
case DLT_LINUX_SLL:
inner_pdu(new Tins::SLL(stream.pointer(), stream.size()));
break;
}
}
}
uint32_t PPI::header_size() const {
return static_cast<uint32_t>(sizeof(header_) + data_.size());
}
void PPI::write_serialization(uint8_t* /*buffer*/, uint32_t /*total_sz*/) {
throw pdu_not_serializable();
}
void PPI::parse_80211(const uint8_t* buffer, uint32_t total_sz) {
#ifdef TINS_HAVE_DOT11
if (data_.size() >= 13) {
// Is FCS-at-end on?
if ((data_[12] & 1) == 1) {
// We need to reduce the total size since we're skipping the FCS
if (total_sz < sizeof(uint32_t)) {
throw malformed_packet();
}
total_sz -= sizeof(uint32_t);
}
}
inner_pdu(Dot11::from_bytes(buffer, total_sz));
#endif // TINS_HAVE_DOT11
}
} // Tins
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