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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>
#ifndef _WIN32
#include <sys/types.h>
#include <net/ethernet.h>
#endif
#include <tins/snap.h>
#include <tins/constants.h>
#include <tins/exceptions.h>
#include <tins/memory_helpers.h>
#include <tins/detail/pdu_helpers.h>
using Tins::Memory::InputMemoryStream;
using Tins::Memory::OutputMemoryStream;
namespace Tins {
SNAP::SNAP()
: snap_() {
snap_.dsap = snap_.ssap = 0xaa;
control(3);
}
SNAP::SNAP(const uint8_t* buffer, uint32_t total_sz) {
InputMemoryStream stream(buffer, total_sz);
stream.read(snap_);
if (stream) {
inner_pdu(
Internals::pdu_from_flag(
(Constants::Ethernet::e)eth_type(),
stream.pointer(),
stream.size()
)
);
}
}
void SNAP::control(uint8_t new_control) {
#if TINS_IS_LITTLE_ENDIAN
snap_.control_org = (snap_.control_org & 0xffffff00) | (new_control);
#else
snap_.control_org = (snap_.control_org & 0xffffff) | (new_control << 24);
#endif
}
void SNAP::org_code(small_uint<24> new_org) {
#if TINS_IS_LITTLE_ENDIAN
snap_.control_org = Endian::host_to_be<uint32_t>(new_org) | control();
#else
snap_.control_org = new_org | (control() << 24);
#endif
}
void SNAP::eth_type(uint16_t new_eth) {
snap_.eth_type = Endian::host_to_be(new_eth);
}
uint32_t SNAP::header_size() const {
return sizeof(snap_);
}
void SNAP::write_serialization(uint8_t* buffer, uint32_t total_sz) {
OutputMemoryStream stream(buffer, total_sz);
if (inner_pdu()) {
Constants::Ethernet::e flag = Internals::pdu_flag_to_ether_type(
inner_pdu()->pdu_type()
);
snap_.eth_type = Endian::host_to_be(
static_cast<uint16_t>(flag)
);
}
stream.write(snap_);
}
} // Tins
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