mirror of
https://github.com/mfontanini/libtins
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140 lines
4.0 KiB
C++
140 lines
4.0 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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#include <cstring>
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#include <tins/ipsec.h>
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#include <tins/rawpdu.h>
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#include <tins/memory_helpers.h>
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#include <tins/detail/pdu_helpers.h>
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using std::memcpy;
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using std::copy;
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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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IPSecAH::IPSecAH()
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: header_(), icv_(4) {
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length(2);
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}
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IPSecAH::IPSecAH(const uint8_t* buffer, uint32_t total_sz) {
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InputMemoryStream stream(buffer, total_sz);
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stream.read(header_);
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const uint32_t ah_len = 4 * (static_cast<uint16_t>(length()) + 2);
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if (ah_len < sizeof(header_)) {
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throw malformed_packet();
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}
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const uint32_t icv_length = ah_len - sizeof(header_);
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if (!stream.can_read(icv_length)) {
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throw malformed_packet();
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}
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stream.read(icv_, icv_length);
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if (stream) {
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inner_pdu(
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Internals::pdu_from_flag(
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static_cast<Constants::IP::e>(next_header()),
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stream.pointer(),
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stream.size(),
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true
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)
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);
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}
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}
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void IPSecAH::next_header(uint8_t new_next_header) {
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header_.next_header = new_next_header;
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}
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void IPSecAH::length(uint8_t new_length) {
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header_.length = new_length;
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}
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void IPSecAH::spi(uint32_t new_spi) {
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header_.spi = Endian::host_to_be(new_spi);
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}
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void IPSecAH::seq_number(uint32_t new_seq_number) {
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header_.seq_number = Endian::host_to_be(new_seq_number);
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}
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void IPSecAH::icv(const byte_array& newicv_) {
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icv_ = newicv_;
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}
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uint32_t IPSecAH::header_size() const {
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return static_cast<uint32_t>(sizeof(header_) + icv_.size());
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}
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void IPSecAH::write_serialization(uint8_t* buffer, uint32_t total_sz) {
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if (inner_pdu()) {
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next_header(Internals::pdu_flag_to_ip_type(inner_pdu()->pdu_type()));
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}
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length(header_size() / sizeof(uint32_t) - 2);
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OutputMemoryStream output(buffer, total_sz);
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output.write(header_);
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output.write(icv_.begin(), icv_.end());
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}
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// IPSecESP
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IPSecESP::IPSecESP()
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: header_() {
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}
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IPSecESP::IPSecESP(const uint8_t* buffer, uint32_t total_sz) {
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InputMemoryStream stream(buffer, total_sz);
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stream.read(header_);
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if (stream) {
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inner_pdu(new RawPDU(stream.pointer(), stream.size()));
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}
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}
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void IPSecESP::spi(uint32_t new_spi) {
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header_.spi = Endian::host_to_be(new_spi);
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}
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void IPSecESP::seq_number(uint32_t new_seq_number) {
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header_.seq_number = Endian::host_to_be(new_seq_number);
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}
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uint32_t IPSecESP::header_size() const {
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return sizeof(header_);
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}
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void IPSecESP::write_serialization(uint8_t* buffer, uint32_t total_sz) {
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OutputMemoryStream output(buffer, total_sz);
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output.write(header_);
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}
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} // Tins
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