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https://git.wownero.com/wownero/wownero.git
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85db1734e7
There are quite a few variables in the code that are no longer (or perhaps never were) in use. These were discovered by enabling compiler warnings for unused variables and cleaning them up. In most cases where the unused variables were the result of a function call the call was left but the variable assignment removed, unless it was obvious that it was a simple getter with no side effects.
332 lines
12 KiB
C++
332 lines
12 KiB
C++
// Copyright (c) 2018-2020, The Monero Project
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//
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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 modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "socks.h"
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#include <algorithm>
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#include <boost/asio/buffer.hpp>
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#include <boost/asio/read.hpp>
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#include <boost/asio/write.hpp>
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#include <boost/endian/arithmetic.hpp>
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#include <boost/endian/conversion.hpp>
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#include <cstring>
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#include <limits>
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#include <string>
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#include "net/net_utils_base.h"
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#include "net/tor_address.h"
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#include "net/i2p_address.h"
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namespace net
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{
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namespace socks
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{
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namespace
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{
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constexpr const std::uint8_t v4_connect_command = 1;
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constexpr const std::uint8_t v4tor_resolve_command = 0xf0;
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constexpr const std::uint8_t v4_request_granted = 90;
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struct v4_header
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{
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std::uint8_t version;
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std::uint8_t command_code;
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boost::endian::big_uint16_t port;
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boost::endian::big_uint32_t ip;
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};
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std::size_t write_domain_header(epee::span<std::uint8_t> out, const std::uint8_t command, const std::uint16_t port, const boost::string_ref domain)
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{
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if (std::numeric_limits<std::size_t>::max() - sizeof(v4_header) - 2 < domain.size())
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return 0;
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const std::size_t buf_size = sizeof(v4_header) + domain.size() + 2;
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if (out.size() < buf_size)
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return 0;
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// version 4, 1 indicates invalid ip for domain extension
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const v4_header temp{4, command, port, std::uint32_t(1)};
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std::memcpy(out.data(), std::addressof(temp), sizeof(temp));
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out.remove_prefix(sizeof(temp));
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*(out.data()) = 0;
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out.remove_prefix(1);
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std::memcpy(out.data(), domain.data(), domain.size());
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out.remove_prefix(domain.size());
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*(out.data()) = 0;
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return buf_size;
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}
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struct socks_category : boost::system::error_category
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{
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explicit socks_category() noexcept
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: boost::system::error_category()
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{}
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const char* name() const noexcept override
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{
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return "net::socks::error_category";
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}
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virtual std::string message(int value) const override
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{
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switch (socks::error(value))
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{
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case socks::error::rejected:
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return "Socks request rejected or failed";
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case socks::error::identd_connection:
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return "Socks request rejected because server cannot connect to identd on the client";
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case socks::error::identd_user:
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return "Socks request rejected because the client program and identd report different user-ids";
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case socks::error::bad_read:
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return "Socks boost::async_read read fewer bytes than expected";
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case socks::error::bad_write:
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return "Socks boost::async_write wrote fewer bytes than expected";
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case socks::error::unexpected_version:
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return "Socks server returned unexpected version in reply";
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default:
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break;
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}
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return "Unknown net::socks::error";
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}
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boost::system::error_condition default_error_condition(int value) const noexcept override
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{
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switch (socks::error(value))
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{
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case socks::error::bad_read:
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case socks::error::bad_write:
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return boost::system::errc::io_error;
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case socks::error::unexpected_version:
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return boost::system::errc::protocol_error;
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default:
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break;
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};
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if (1 <= value && value <= 256)
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return boost::system::errc::protocol_error;
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return boost::system::error_condition{value, *this};
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}
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};
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}
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const boost::system::error_category& error_category() noexcept
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{
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static const socks_category instance{};
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return instance;
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}
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struct client::completed
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{
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std::shared_ptr<client> self_;
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void operator()(const boost::system::error_code error, const std::size_t bytes) const
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{
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static_assert(1 < sizeof(self_->buffer_), "buffer too small for v4 response");
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if (self_)
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{
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client& self = *self_;
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self.buffer_size_ = std::min(bytes, sizeof(self.buffer_));
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if (error)
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self.done(error, std::move(self_));
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else if (self.buffer().size() < sizeof(v4_header))
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self.done(socks::error::bad_read, std::move(self_));
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else if (self.buffer_[0] != 0) // response version
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self.done(socks::error::unexpected_version, std::move(self_));
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else if (self.buffer_[1] != v4_request_granted)
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self.done(socks::error(int(self.buffer_[1]) + 1), std::move(self_));
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else
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self.done(boost::system::error_code{}, std::move(self_));
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}
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}
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};
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struct client::read
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{
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std::shared_ptr<client> self_;
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static boost::asio::mutable_buffers_1 get_buffer(client& self) noexcept
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{
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static_assert(sizeof(v4_header) <= sizeof(self.buffer_), "buffer too small for v4 response");
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return boost::asio::buffer(self.buffer_, sizeof(v4_header));
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}
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void operator()(const boost::system::error_code error, const std::size_t bytes)
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{
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if (self_)
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{
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client& self = *self_;
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if (error)
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self.done(error, std::move(self_));
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else if (bytes < self.buffer().size())
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self.done(socks::error::bad_write, std::move(self_));
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else
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boost::asio::async_read(self.proxy_, get_buffer(self), self.strand_.wrap(completed{std::move(self_)}));
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}
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}
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};
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struct client::write
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{
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std::shared_ptr<client> self_;
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static boost::asio::const_buffers_1 get_buffer(client const& self) noexcept
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{
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return boost::asio::buffer(self.buffer_, self.buffer_size_);
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}
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void operator()(const boost::system::error_code error)
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{
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if (self_)
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{
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client& self = *self_;
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if (error)
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self.done(error, std::move(self_));
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else
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boost::asio::async_write(self.proxy_, get_buffer(self), self.strand_.wrap(read{std::move(self_)}));
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}
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}
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};
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client::client(stream_type::socket&& proxy, socks::version ver)
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: proxy_(std::move(proxy)), strand_(GET_IO_SERVICE(proxy_)), buffer_size_(0), buffer_(), ver_(ver)
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{}
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client::~client() {}
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bool client::set_connect_command(const epee::net_utils::ipv4_network_address& address)
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{
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switch (socks_version())
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{
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case version::v4:
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case version::v4a:
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case version::v4a_tor:
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break;
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default:
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return false;
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}
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static_assert(sizeof(v4_header) < sizeof(buffer_), "buffer size too small for request");
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static_assert(0 < sizeof(buffer_), "buffer size too small for null termination");
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// version 4
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const v4_header temp{4, v4_connect_command, address.port(), boost::endian::big_to_native(address.ip())};
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std::memcpy(std::addressof(buffer_), std::addressof(temp), sizeof(temp));
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buffer_[sizeof(temp)] = 0;
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buffer_size_ = sizeof(temp) + 1;
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return true;
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}
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bool client::set_connect_command(const boost::string_ref domain, std::uint16_t port)
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{
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switch (socks_version())
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{
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case version::v4a:
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case version::v4a_tor:
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break;
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default:
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return false;
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}
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const std::size_t buf_used = write_domain_header(buffer_, v4_connect_command, port, domain);
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buffer_size_ = buf_used;
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return buf_used != 0;
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}
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bool client::set_connect_command(const net::tor_address& address)
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{
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if (!address.is_unknown())
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return set_connect_command(address.host_str(), address.port());
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return false;
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}
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bool client::set_connect_command(const net::i2p_address& address)
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{
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if (!address.is_unknown())
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return set_connect_command(address.host_str(), address.port());
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return false;
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}
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bool client::set_resolve_command(boost::string_ref domain)
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{
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if (socks_version() != version::v4a_tor)
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return false;
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const std::size_t buf_used = write_domain_header(buffer_, v4tor_resolve_command, 0, domain);
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buffer_size_ = buf_used;
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return buf_used != 0;
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}
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bool client::connect_and_send(std::shared_ptr<client> self, const stream_type::endpoint& proxy_address)
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{
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if (self && !self->buffer().empty())
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{
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client& alias = *self;
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alias.proxy_.async_connect(proxy_address, alias.strand_.wrap(write{std::move(self)}));
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return true;
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}
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return false;
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}
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bool client::send(std::shared_ptr<client> self)
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{
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if (self && !self->buffer().empty())
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{
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client& alias = *self;
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boost::asio::async_write(alias.proxy_, write::get_buffer(alias), alias.strand_.wrap(read{std::move(self)}));
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return true;
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}
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return false;
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}
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void client::async_close::operator()(boost::system::error_code error)
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{
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if (self_ && error != boost::system::errc::operation_canceled)
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{
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const std::shared_ptr<client> self = std::move(self_);
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self->strand_.dispatch([self] ()
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{
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if (self && self->proxy_.is_open())
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{
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self->proxy_.shutdown(boost::asio::ip::tcp::socket::shutdown_both);
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self->proxy_.close();
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}
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});
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}
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}
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} // socks
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} // net
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