mirror of
https://github.com/mfontanini/libtins
synced 2026-01-25 19:51:34 +01:00
60 lines
1.8 KiB
C++
60 lines
1.8 KiB
C++
/*
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* libtins is a net packet wrapper library for crafting and
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* interpreting sniffed packets.
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*
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* Copyright (C) 2011 Nasel
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <cstring>
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#include <cassert>
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#ifndef WIN32
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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 "utils.h"
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Tins::SNAP::SNAP(PDU *child) : PDU(0xff, child) {
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std::memset(&_snap, 0, sizeof(_snap));
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_snap.dsap = _snap.ssap = 0xaa;
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_snap.id = 3;
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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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assert(total_sz >= sizeof(_snap));
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if (!_snap.eth_type && inner_pdu()) {
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uint16_t type = ETHERTYPE_IP;
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switch (inner_pdu()->pdu_type()) {
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case PDU::IP:
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type = ETHERTYPE_IP;
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break;
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case PDU::ARP:
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type = ETHERTYPE_ARP;
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break;
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default:
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type = 0;
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}
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_snap.eth_type = Utils::net_to_host_s(type);
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}
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std::memcpy(buffer, &_snap, sizeof(_snap));
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}
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