mirror of
https://github.com/mfontanini/libtins
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111 lines
3.3 KiB
C++
111 lines
3.3 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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#include <cstring>
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#ifdef TINS_DEBUG
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#include <cassert>
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#endif
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#include <stdexcept>
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#ifndef _WIN32
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#include <sys/types.h>
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#include <net/ethernet.h>
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#endif
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#include "snap.h"
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#include "constants.h"
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#include "arp.h"
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#include "ip.h"
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#include "eapol.h"
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#include "internals.h"
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#include "exceptions.h"
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Tins::SNAP::SNAP()
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{
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std::memset(&_snap, 0, sizeof(_snap));
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_snap.dsap = _snap.ssap = 0xaa;
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control(3);
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}
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Tins::SNAP::SNAP(const uint8_t *buffer, uint32_t total_sz)
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{
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if(total_sz < sizeof(_snap))
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throw malformed_packet();
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std::memcpy(&_snap, buffer, sizeof(_snap));
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buffer += sizeof(_snap);
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total_sz -= sizeof(_snap);
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if(total_sz) {
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inner_pdu(
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Internals::pdu_from_flag(
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(Constants::Ethernet::e)eth_type(),
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buffer,
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total_sz
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)
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);
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}
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}
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void Tins::SNAP::control(uint8_t new_control) {
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#if TINS_IS_LITTLE_ENDIAN
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_snap.control_org = (_snap.control_org & 0xffffff00) | (new_control);
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#else
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_snap.control_org = (_snap.control_org & 0xffffff) | (new_control << 24);
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#endif
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}
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void Tins::SNAP::org_code(small_uint<24> new_org) {
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#if TINS_IS_LITTLE_ENDIAN
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_snap.control_org = Endian::host_to_be<uint32_t>(new_org) | control();
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#else
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_snap.control_org = new_org | (control() << 24);
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#endif
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}
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void Tins::SNAP::eth_type(uint16_t new_eth) {
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_snap.eth_type = Endian::host_to_be(new_eth);
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}
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uint32_t Tins::SNAP::header_size() const {
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return sizeof(_snap);
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}
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void Tins::SNAP::write_serialization(uint8_t *buffer, uint32_t total_sz, const PDU *parent) {
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#ifdef TINS_DEBUG
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assert(total_sz >= sizeof(_snap));
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#endif
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if (inner_pdu()) {
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Constants::Ethernet::e flag = Internals::pdu_flag_to_ether_type(
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inner_pdu()->pdu_type()
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);
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_snap.eth_type = Endian::host_to_be(
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static_cast<uint16_t>(flag)
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);
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}
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std::memcpy(buffer, &_snap, sizeof(_snap));
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}
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