mirror of
https://git.wownero.com/wownero/wownero.git
synced 2024-08-15 01:03:23 +00:00
129 lines
5.1 KiB
C++
129 lines
5.1 KiB
C++
// Copyright (c) 2019-2020, The Monero Project
|
|
//
|
|
// All rights reserved.
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without modification, are
|
|
// permitted provided that the following conditions are met:
|
|
//
|
|
// 1. Redistributions of source code must retain the above copyright notice, this list of
|
|
// conditions and the following disclaimer.
|
|
//
|
|
// 2. 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.
|
|
//
|
|
// 3. Neither the name of the copyright holder nor the names of its contributors may be
|
|
// used to endorse or promote products derived from this software without specific
|
|
// prior written permission.
|
|
//
|
|
// 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 HOLDER 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 "net/levin_base.h"
|
|
|
|
#include "int-util.h"
|
|
|
|
namespace epee
|
|
{
|
|
namespace levin
|
|
{
|
|
bucket_head2 make_header(uint32_t command, uint64_t msg_size, uint32_t flags, bool expect_response) noexcept
|
|
{
|
|
bucket_head2 head = {0};
|
|
head.m_signature = SWAP64LE(LEVIN_SIGNATURE);
|
|
head.m_have_to_return_data = expect_response;
|
|
head.m_cb = SWAP64LE(msg_size);
|
|
|
|
head.m_command = SWAP32LE(command);
|
|
head.m_protocol_version = SWAP32LE(LEVIN_PROTOCOL_VER_1);
|
|
head.m_flags = SWAP32LE(flags);
|
|
return head;
|
|
}
|
|
|
|
byte_slice make_notify(int command, epee::span<const std::uint8_t> payload)
|
|
{
|
|
const bucket_head2 head = make_header(command, payload.size(), LEVIN_PACKET_REQUEST, false);
|
|
return byte_slice{epee::as_byte_span(head), payload};
|
|
}
|
|
|
|
byte_slice make_noise_notify(const std::size_t noise_bytes)
|
|
{
|
|
static constexpr const std::uint32_t flags =
|
|
LEVIN_PACKET_BEGIN | LEVIN_PACKET_END;
|
|
|
|
if (noise_bytes < sizeof(bucket_head2))
|
|
return nullptr;
|
|
|
|
std::string buffer(noise_bytes, char(0));
|
|
const bucket_head2 head = make_header(0, noise_bytes - sizeof(bucket_head2), flags, false);
|
|
std::memcpy(std::addressof(buffer[0]), std::addressof(head), sizeof(head));
|
|
|
|
return byte_slice{std::move(buffer)};
|
|
}
|
|
|
|
byte_slice make_fragmented_notify(const byte_slice& noise_message, int command, epee::span<const std::uint8_t> payload)
|
|
{
|
|
const size_t noise_size = noise_message.size();
|
|
if (noise_size < sizeof(bucket_head2) * 2)
|
|
return nullptr;
|
|
|
|
if (payload.size() <= noise_size - sizeof(bucket_head2))
|
|
{
|
|
/* The entire message can be sent at once, and the levin binary parser
|
|
will ignore extra bytes. So just pad with zeroes and otherwise send
|
|
a "normal", not fragmented message. */
|
|
const size_t padding = noise_size - sizeof(bucket_head2) - payload.size();
|
|
const span<const uint8_t> padding_bytes{noise_message.end() - padding, padding};
|
|
|
|
const bucket_head2 head = make_header(command, noise_size - sizeof(bucket_head2), LEVIN_PACKET_REQUEST, false);
|
|
return byte_slice{as_byte_span(head), payload, padding_bytes};
|
|
}
|
|
|
|
// fragment message
|
|
const size_t payload_space = noise_size - sizeof(bucket_head2);
|
|
const size_t expected_fragments = ((payload.size() - 2) / payload_space) + 1;
|
|
|
|
std::string buffer{};
|
|
buffer.reserve((expected_fragments + 1) * noise_size); // +1 here overselects for internal bucket_head2 value
|
|
|
|
bucket_head2 head = make_header(0, noise_size - sizeof(bucket_head2), LEVIN_PACKET_BEGIN, false);
|
|
buffer.append(reinterpret_cast<const char*>(&head), sizeof(head));
|
|
|
|
head.m_command = command;
|
|
head.m_flags = LEVIN_PACKET_REQUEST;
|
|
head.m_cb = payload.size();
|
|
buffer.append(reinterpret_cast<const char*>(&head), sizeof(head));
|
|
|
|
size_t copy_size = payload.remove_prefix(payload_space - sizeof(bucket_head2));
|
|
buffer.append(reinterpret_cast<const char*>(payload.data()) - copy_size, copy_size);
|
|
|
|
head.m_command = 0;
|
|
head.m_flags = 0;
|
|
head.m_cb = noise_size - sizeof(bucket_head2);
|
|
|
|
while (!payload.empty())
|
|
{
|
|
copy_size = payload.remove_prefix(payload_space);
|
|
|
|
if (payload.empty())
|
|
head.m_flags = LEVIN_PACKET_END;
|
|
|
|
buffer.append(reinterpret_cast<const char*>(&head), sizeof(head));
|
|
buffer.append(reinterpret_cast<const char*>(payload.data()) - copy_size, copy_size);
|
|
}
|
|
|
|
const size_t padding = noise_size - copy_size - sizeof(bucket_head2);
|
|
buffer.append(reinterpret_cast<const char*>(noise_message.end()) - padding, padding);
|
|
|
|
return byte_slice{std::move(buffer)};
|
|
}
|
|
} // levin
|
|
} // epee
|