mirror of
https://github.com/mfontanini/libtins
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132 lines
3.9 KiB
C++
132 lines
3.9 KiB
C++
/*
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* Copyright (c) 2017, 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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#ifndef _WIN32
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#include <sys/socket.h>
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#ifdef BSD
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#include <net/if_dl.h>
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#include <netinet/in.h>
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#include <net/ethernet.h>
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#endif
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#else
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#include <ws2tcpip.h>
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#endif
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#include <cstring>
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#include <tins/loopback.h>
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#include <tins/packet_sender.h>
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#include <tins/ip.h>
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#include <tins/ipv6.h>
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#include <tins/llc.h>
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#include <tins/rawpdu.h>
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#include <tins/exceptions.h>
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#include <tins/memory_helpers.h>
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#if !defined(PF_LLC)
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// compilation fix, nasty but at least works on BSD
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#define PF_LLC 26
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#endif
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using Tins::Memory::InputMemoryStream;
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using Tins::Memory::OutputMemoryStream;
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namespace Tins {
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Loopback::Loopback()
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: family_() {
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}
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Loopback::Loopback(const uint8_t* buffer, uint32_t total_sz) {
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InputMemoryStream stream(buffer, total_sz);
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family_ = stream.read<uint32_t>();
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if (total_sz) {
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switch (family_) {
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case PF_INET:
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inner_pdu(new Tins::IP(stream.pointer(), stream.size()));
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break;
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case PF_INET6:
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inner_pdu(new Tins::IPv6(stream.pointer(), stream.size()));
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break;
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case PF_LLC:
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inner_pdu(new Tins::LLC(stream.pointer(), stream.size()));
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break;
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default:
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inner_pdu(new Tins::RawPDU(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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void Loopback::family(uint32_t family_id) {
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family_ = family_id;
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}
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uint32_t Loopback::header_size() const {
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return sizeof(family_);
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}
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void Loopback::write_serialization(uint8_t* buffer, uint32_t total_sz) {
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OutputMemoryStream stream(buffer, total_sz);
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if (tins_cast<const Tins::IP*>(inner_pdu())) {
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family_ = PF_INET;
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}
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else if (tins_cast<const Tins::IPv6*>(inner_pdu())) {
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family_ = PF_INET6;
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}
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else if (tins_cast<const Tins::LLC*>(inner_pdu())) {
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family_ = PF_LLC;
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}
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stream.write(family_);
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}
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bool Loopback::matches_response(const uint8_t* ptr, uint32_t total_sz) const {
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if (total_sz < sizeof(family_)) {
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return false;
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}
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// If there's an inner_pdu, check if the inner pdu matches.
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// Otherwise, just check this loopback family.
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return inner_pdu() ?
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inner_pdu()->matches_response(ptr + sizeof(family_), total_sz - sizeof(family_)) :
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(family_ == *reinterpret_cast<const uint32_t*>(ptr));
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}
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#ifdef BSD
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void Loopback::send(PacketSender& sender, const NetworkInterface& iface) {
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if (!iface) {
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throw invalid_interface();
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}
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sender.send_l2(*this, 0, 0, iface);
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}
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#endif // _WIN32
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} // Tins
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