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monero/contrib/epee/include/net/net_helper.h

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// Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of the Andrey N. Sabelnikov 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 OWNER 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.
//
#pragma once
//#include <Winsock2.h>
//#include <Ws2tcpip.h>
#include <atomic>
#include <string>
#include <boost/version.hpp>
#include <boost/asio/io_service.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <boost/asio/read.hpp>
#include <boost/asio/ssl.hpp>
#include <boost/asio/steady_timer.hpp>
#include <boost/thread/future.hpp>
#include <boost/lambda/bind.hpp>
#include <boost/lambda/lambda.hpp>
#include <boost/system/error_code.hpp>
#include <boost/utility/string_ref.hpp>
#include <functional>
#include "net/net_utils_base.h"
#include "net/net_ssl.h"
#include "misc_language.h"
#undef MONERO_DEFAULT_LOG_CATEGORY
#define MONERO_DEFAULT_LOG_CATEGORY "net"
#ifndef MAKE_IP
#define MAKE_IP( a1, a2, a3, a4 ) (a1|(a2<<8)|(a3<<16)|(a4<<24))
#endif
namespace epee
{
namespace net_utils
{
struct direct_connect
{
boost::unique_future<boost::asio::ip::tcp::socket>
operator()(const std::string& addr, const std::string& port, boost::asio::steady_timer&) const;
};
class blocked_mode_client
{
enum try_connect_result_t
{
CONNECT_SUCCESS,
CONNECT_FAILURE,
CONNECT_NO_SSL,
};
struct handler_obj
{
handler_obj(boost::system::error_code& error, size_t& bytes_transferred):ref_error(error), ref_bytes_transferred(bytes_transferred)
{}
handler_obj(const handler_obj& other_obj):ref_error(other_obj.ref_error), ref_bytes_transferred(other_obj.ref_bytes_transferred)
{}
boost::system::error_code& ref_error;
size_t& ref_bytes_transferred;
void operator()(const boost::system::error_code& error, // Result of operation.
std::size_t bytes_transferred // Number of bytes read.
)
{
ref_error = error;
ref_bytes_transferred = bytes_transferred;
}
};
public:
inline
blocked_mode_client() :
m_io_service(),
m_ctx(boost::asio::ssl::context::tlsv12),
m_ssl_socket(new boost::asio::ssl::stream<boost::asio::ip::tcp::socket>(m_io_service, m_ctx)),
m_connector(direct_connect{}),
m_ssl_options(epee::net_utils::ssl_support_t::e_ssl_support_autodetect),
m_initialized(true),
m_connected(false),
m_deadline(m_io_service, std::chrono::steady_clock::time_point::max()),
m_shutdowned(false),
m_bytes_sent(0),
m_bytes_received(0)
{
check_deadline();
}
/*! The first/second parameters are host/port respectively. The third
parameter is for setting the timeout callback - the timer is
already set by the caller, the callee only needs to set the
behavior.
Additional asynchronous operations should be queued using the
`io_service` from the timer. The implementation should assume
multi-threaded I/O processing.
If the callee cannot start an asynchronous operation, an exception
should be thrown to signal an immediate failure.
The return value is a future to a connected socket. Asynchronous
failures should use the `set_exception` method. */
using connect_func = boost::unique_future<boost::asio::ip::tcp::socket>(const std::string&, const std::string&, boost::asio::steady_timer&);
inline
~blocked_mode_client()
{
//profile_tools::local_coast lc("~blocked_mode_client()", 3);
try { shutdown(); }
catch(...) { /* ignore */ }
}
inline void set_ssl(ssl_options_t ssl_options)
{
if (ssl_options)
m_ctx = ssl_options.create_context();
else
m_ctx = boost::asio::ssl::context(boost::asio::ssl::context::tlsv12);
m_ssl_options = std::move(ssl_options);
}
inline
bool connect(const std::string& addr, int port, std::chrono::milliseconds timeout)
{
return connect(addr, std::to_string(port), timeout);
}
inline
try_connect_result_t try_connect(const std::string& addr, const std::string& port, std::chrono::milliseconds timeout)
{
m_deadline.expires_from_now(timeout);
boost::unique_future<boost::asio::ip::tcp::socket> connection = m_connector(addr, port, m_deadline);
for (;;)
{
m_io_service.reset();
m_io_service.run_one();
if (connection.is_ready())
break;
}
m_ssl_socket->next_layer() = connection.get();
m_deadline.cancel();
if (m_ssl_socket->next_layer().is_open())
{
m_connected = true;
m_deadline.expires_at(std::chrono::steady_clock::time_point::max());
// SSL Options
if (m_ssl_options.support == epee::net_utils::ssl_support_t::e_ssl_support_enabled || m_ssl_options.support == epee::net_utils::ssl_support_t::e_ssl_support_autodetect)
{
if (!m_ssl_options.handshake(*m_ssl_socket, boost::asio::ssl::stream_base::client, {}, addr, timeout))
{
if (m_ssl_options.support == epee::net_utils::ssl_support_t::e_ssl_support_autodetect)
{
boost::system::error_code ignored_ec;
m_ssl_socket->next_layer().shutdown(boost::asio::ip::tcp::socket::shutdown_both, ignored_ec);
m_ssl_socket->next_layer().close();
m_connected = false;
return CONNECT_NO_SSL;
}
else
{
MWARNING("Failed to establish SSL connection");
m_connected = false;
return CONNECT_FAILURE;
}
}
}
return CONNECT_SUCCESS;
}else
{
MWARNING("Some problems at connect, expected open socket");
return CONNECT_FAILURE;
}
}
inline
bool connect(const std::string& addr, const std::string& port, std::chrono::milliseconds timeout)
{
m_connected = false;
try
{
m_ssl_socket->next_layer().close();
// Set SSL options
// disable sslv2
m_ssl_socket.reset(new boost::asio::ssl::stream<boost::asio::ip::tcp::socket>(m_io_service, m_ctx));
// Get a list of endpoints corresponding to the server name.
try_connect_result_t try_connect_result = try_connect(addr, port, timeout);
if (try_connect_result == CONNECT_FAILURE)
return false;
if (m_ssl_options.support == epee::net_utils::ssl_support_t::e_ssl_support_autodetect)
{
if (try_connect_result == CONNECT_NO_SSL)
{
MERROR("SSL handshake failed on an autodetect connection, reconnecting without SSL");
m_ssl_options.support = epee::net_utils::ssl_support_t::e_ssl_support_disabled;
if (try_connect(addr, port, timeout) != CONNECT_SUCCESS)
return false;
}
}
}
catch(const boost::system::system_error& er)
{
MDEBUG("Some problems at connect, message: " << er.what());
return false;
}
catch(...)
{
MDEBUG("Some fatal problems.");
return false;
}
return true;
}
//! Change the connection routine (proxy, etc.)
void set_connector(std::function<connect_func> connector)
{
m_connector = std::move(connector);
}
inline
bool disconnect()
{
try
{
if(m_connected)
{
m_connected = false;
if(m_ssl_options)
shutdown_ssl();
m_ssl_socket->next_layer().shutdown(boost::asio::ip::tcp::socket::shutdown_both);
}
}
catch(const boost::system::system_error& /*er*/)
{
//LOG_ERROR("Some problems at disconnect, message: " << er.what());
return false;
}
catch(...)
{
//LOG_ERROR("Some fatal problems.");
return false;
}
return true;
}
inline
bool send(const boost::string_ref buff, std::chrono::milliseconds timeout)
{
try
{
m_deadline.expires_from_now(timeout);
// Set up the variable that receives the result of the asynchronous
// operation. The error code is set to would_block to signal that the
// operation is incomplete. Asio guarantees that its asynchronous
// operations will never fail with would_block, so any other value in
// ec indicates completion.
boost::system::error_code ec = boost::asio::error::would_block;
// Start the asynchronous operation itself. The boost::lambda function
// object is used as a callback and will update the ec variable when the
// operation completes. The blocking_udp_client.cpp example shows how you
// can use boost::bind rather than boost::lambda.
async_write(buff.data(), buff.size(), ec);
// Block until the asynchronous operation has completed.
while (ec == boost::asio::error::would_block)
{
m_io_service.reset();
m_io_service.run_one();
}
if (ec)
{
LOG_PRINT_L3("Problems at write: " << ec.message());
m_connected = false;
return false;
}else
{
m_deadline.expires_at(std::chrono::steady_clock::time_point::max());
m_bytes_sent += buff.size();
}
}
catch(const boost::system::system_error& er)
{
LOG_ERROR("Some problems at connect, message: " << er.what());
return false;
}
catch(...)
{
LOG_ERROR("Some fatal problems.");
return false;
}
return true;
}
inline
bool send(const void* data, size_t sz)
{
try
{
/*
m_deadline.expires_from_now(boost::posix_time::milliseconds(m_reciev_timeout));
// Set up the variable that receives the result of the asynchronous
// operation. The error code is set to would_block to signal that the
// operation is incomplete. Asio guarantees that its asynchronous
// operations will never fail with would_block, so any other value in
// ec indicates completion.
boost::system::error_code ec = boost::asio::error::would_block;
// Start the asynchronous operation itself. The boost::lambda function
// object is used as a callback and will update the ec variable when the
// operation completes. The blocking_udp_client.cpp example shows how you
// can use boost::bind rather than boost::lambda.
boost::asio::async_write(m_socket, boost::asio::buffer(data, sz), boost::lambda::var(ec) = boost::lambda::_1);
// Block until the asynchronous operation has completed.
while (ec == boost::asio::error::would_block)
{
m_io_service.run_one();
}
*/
boost::system::error_code ec;
size_t writen = write(data, sz, ec);
if (!writen || ec)
{
LOG_PRINT_L3("Problems at write: " << ec.message());
m_connected = false;
return false;
}else
{
m_deadline.expires_at(std::chrono::steady_clock::time_point::max());
m_bytes_sent += sz;
}
}
catch(const boost::system::system_error& er)
{
LOG_ERROR("Some problems at send, message: " << er.what());
m_connected = false;
return false;
}
catch(...)
{
LOG_ERROR("Some fatal problems.");
return false;
}
return true;
}
bool is_connected(bool *ssl = NULL)
{
if (!m_connected || !m_ssl_socket->next_layer().is_open())
return false;
if (ssl)
*ssl = m_ssl_options.support != ssl_support_t::e_ssl_support_disabled;
return true;
}
inline
bool recv(std::string& buff, std::chrono::milliseconds timeout)
{
try
{
// Set a deadline for the asynchronous operation. Since this function uses
// a composed operation (async_read_until), the deadline applies to the
// entire operation, rather than individual reads from the socket.
m_deadline.expires_from_now(timeout);
// Set up the variable that receives the result of the asynchronous
// operation. The error code is set to would_block to signal that the
// operation is incomplete. Asio guarantees that its asynchronous
// operations will never fail with would_block, so any other value in
// ec indicates completion.
//boost::system::error_code ec = boost::asio::error::would_block;
// Start the asynchronous operation itself. The boost::lambda function
// object is used as a callback and will update the ec variable when the
// operation completes. The blocking_udp_client.cpp example shows how you
// can use boost::bind rather than boost::lambda.
boost::system::error_code ec = boost::asio::error::would_block;
size_t bytes_transfered = 0;
handler_obj hndlr(ec, bytes_transfered);
static const size_t max_size = 16384;
buff.resize(max_size);
async_read(&buff[0], max_size, boost::asio::transfer_at_least(1), hndlr);
// Block until the asynchronous operation has completed.
while (ec == boost::asio::error::would_block && !m_shutdowned)
{
m_io_service.reset();
m_io_service.run_one();
}
if (ec)
{
MTRACE("READ ENDS: Connection err_code " << ec.value());
if(ec == boost::asio::error::eof)
{
MTRACE("Connection err_code eof.");
//connection closed there, empty
buff.clear();
return true;
}
MDEBUG("Problems at read: " << ec.message());
m_connected = false;
return false;
}else
{
MTRACE("READ ENDS: Success. bytes_tr: " << bytes_transfered);
m_deadline.expires_at(std::chrono::steady_clock::time_point::max());
}
/*if(!bytes_transfered)
return false;*/
m_bytes_received += bytes_transfered;
buff.resize(bytes_transfered);
return true;
}
catch(const boost::system::system_error& er)
{
LOG_ERROR("Some problems at read, message: " << er.what());
m_connected = false;
return false;
}
catch(...)
{
LOG_ERROR("Some fatal problems at read.");
return false;
}
return false;
}
inline bool recv_n(std::string& buff, int64_t sz, std::chrono::milliseconds timeout)
{
try
{
// Set a deadline for the asynchronous operation. Since this function uses
// a composed operation (async_read_until), the deadline applies to the
// entire operation, rather than individual reads from the socket.
m_deadline.expires_from_now(timeout);
// Set up the variable that receives the result of the asynchronous
// operation. The error code is set to would_block to signal that the
// operation is incomplete. Asio guarantees that its asynchronous
// operations will never fail with would_block, so any other value in
// ec indicates completion.
//boost::system::error_code ec = boost::asio::error::would_block;
// Start the asynchronous operation itself. The boost::lambda function
// object is used as a callback and will update the ec variable when the
// operation completes. The blocking_udp_client.cpp example shows how you
// can use boost::bind rather than boost::lambda.
buff.resize(static_cast<size_t>(sz));
boost::system::error_code ec = boost::asio::error::would_block;
size_t bytes_transfered = 0;
handler_obj hndlr(ec, bytes_transfered);
async_read((char*)buff.data(), buff.size(), boost::asio::transfer_at_least(buff.size()), hndlr);
// Block until the asynchronous operation has completed.
while (ec == boost::asio::error::would_block && !m_shutdowned)
{
m_io_service.run_one();
}
if (ec)
{
LOG_PRINT_L3("Problems at read: " << ec.message());
m_connected = false;
return false;
}else
{
m_deadline.expires_at(std::chrono::steady_clock::time_point::max());
}
m_bytes_received += bytes_transfered;
if(bytes_transfered != buff.size())
{
LOG_ERROR("Transferred mismatch with transfer_at_least value: m_bytes_transferred=" << bytes_transfered << " at_least value=" << buff.size());
return false;
}
return true;
}
catch(const boost::system::system_error& er)
{
LOG_ERROR("Some problems at read, message: " << er.what());
m_connected = false;
return false;
}
catch(...)
{
LOG_ERROR("Some fatal problems at read.");
return false;
}
return false;
}
bool shutdown()
{
m_deadline.cancel();
boost::system::error_code ec;
if(m_ssl_options)
shutdown_ssl();
m_ssl_socket->next_layer().cancel(ec);
if(ec)
MDEBUG("Problems at cancel: " << ec.message());
m_ssl_socket->next_layer().shutdown(boost::asio::ip::tcp::socket::shutdown_both, ec);
if(ec)
MDEBUG("Problems at shutdown: " << ec.message());
m_ssl_socket->next_layer().close(ec);
if(ec)
MDEBUG("Problems at close: " << ec.message());
m_shutdowned = true;
m_connected = false;
return true;
}
boost::asio::io_service& get_io_service()
{
return m_io_service;
}
boost::asio::ip::tcp::socket& get_socket()
{
return m_ssl_socket->next_layer();
}
uint64_t get_bytes_sent() const
{
return m_bytes_sent;
}
uint64_t get_bytes_received() const
{
return m_bytes_received;
}
private:
void check_deadline()
{
// Check whether the deadline has passed. We compare the deadline against
// the current time since a new asynchronous operation may have moved the
// deadline before this actor had a chance to run.
if (m_deadline.expires_at() <= std::chrono::steady_clock::now())
{
// The deadline has passed. The socket is closed so that any outstanding
// asynchronous operations are cancelled. This allows the blocked
// connect(), read_line() or write_line() functions to return.
LOG_PRINT_L3("Timed out socket");
m_connected = false;
m_ssl_socket->next_layer().close();
// There is no longer an active deadline. The expiry is set to positive
// infinity so that the actor takes no action until a new deadline is set.
m_deadline.expires_at(std::chrono::steady_clock::time_point::max());
}
// Put the actor back to sleep.
m_deadline.async_wait(boost::bind(&blocked_mode_client::check_deadline, this));
}
void shutdown_ssl() {
// ssl socket shutdown blocks if server doesn't respond. We close after 2 secs
boost::system::error_code ec = boost::asio::error::would_block;
m_deadline.expires_from_now(std::chrono::milliseconds(2000));
m_ssl_socket->async_shutdown(boost::lambda::var(ec) = boost::lambda::_1);
while (ec == boost::asio::error::would_block)
{
m_io_service.reset();
m_io_service.run_one();
}
// Ignore "short read" error
if (ec.category() == boost::asio::error::get_ssl_category() &&
ec.value() !=
#if BOOST_VERSION >= 106200
boost::asio::ssl::error::stream_truncated
#else // older Boost supports only OpenSSL 1.0, so 1.0-only macros are appropriate
ERR_PACK(ERR_LIB_SSL, 0, SSL_R_SHORT_READ)
#endif
)
MDEBUG("Problems at ssl shutdown: " << ec.message());
}
protected:
bool write(const void* data, size_t sz, boost::system::error_code& ec)
{
bool success;
if(m_ssl_options.support != ssl_support_t::e_ssl_support_disabled)
success = boost::asio::write(*m_ssl_socket, boost::asio::buffer(data, sz), ec);
else
success = boost::asio::write(m_ssl_socket->next_layer(), boost::asio::buffer(data, sz), ec);
return success;
}
void async_write(const void* data, size_t sz, boost::system::error_code& ec)
{
if(m_ssl_options.support != ssl_support_t::e_ssl_support_disabled)
boost::asio::async_write(*m_ssl_socket, boost::asio::buffer(data, sz), boost::lambda::var(ec) = boost::lambda::_1);
else
boost::asio::async_write(m_ssl_socket->next_layer(), boost::asio::buffer(data, sz), boost::lambda::var(ec) = boost::lambda::_1);
}
void async_read(char* buff, size_t sz, boost::asio::detail::transfer_at_least_t transfer_at_least, handler_obj& hndlr)
{
if(m_ssl_options.support == ssl_support_t::e_ssl_support_disabled)
boost::asio::async_read(m_ssl_socket->next_layer(), boost::asio::buffer(buff, sz), transfer_at_least, hndlr);
else
boost::asio::async_read(*m_ssl_socket, boost::asio::buffer(buff, sz), transfer_at_least, hndlr);
}
protected:
boost::asio::io_service m_io_service;
boost::asio::ssl::context m_ctx;
std::shared_ptr<boost::asio::ssl::stream<boost::asio::ip::tcp::socket>> m_ssl_socket;
std::function<connect_func> m_connector;
ssl_options_t m_ssl_options;
bool m_initialized;
bool m_connected;
boost::asio::steady_timer m_deadline;
std::atomic<bool> m_shutdowned;
std::atomic<uint64_t> m_bytes_sent;
std::atomic<uint64_t> m_bytes_received;
};
/************************************************************************/
/* */
/************************************************************************/
class async_blocked_mode_client: public blocked_mode_client
{
public:
async_blocked_mode_client():m_send_deadline(blocked_mode_client::m_io_service)
{
// No deadline is required until the first socket operation is started. We
// set the deadline to positive infinity so that the actor takes no action
// until a specific deadline is set.
m_send_deadline.expires_at(boost::posix_time::pos_infin);
// Start the persistent actor that checks for deadline expiry.
check_send_deadline();
}
~async_blocked_mode_client()
{
m_send_deadline.cancel();
}
bool shutdown()
{
blocked_mode_client::shutdown();
m_send_deadline.cancel();
return true;
}
inline
bool send(const void* data, size_t sz)
{
try
{
/*
m_send_deadline.expires_from_now(boost::posix_time::milliseconds(m_reciev_timeout));
// Set up the variable that receives the result of the asynchronous
// operation. The error code is set to would_block to signal that the
// operation is incomplete. Asio guarantees that its asynchronous
// operations will never fail with would_block, so any other value in
// ec indicates completion.
boost::system::error_code ec = boost::asio::error::would_block;
// Start the asynchronous operation itself. The boost::lambda function
// object is used as a callback and will update the ec variable when the
// operation completes. The blocking_udp_client.cpp example shows how you
// can use boost::bind rather than boost::lambda.
boost::asio::async_write(m_socket, boost::asio::buffer(data, sz), boost::lambda::var(ec) = boost::lambda::_1);
// Block until the asynchronous operation has completed.
while(ec == boost::asio::error::would_block)
{
m_io_service.run_one();
}*/
boost::system::error_code ec;
size_t writen = write(data, sz, ec);
if (!writen || ec)
{
LOG_PRINT_L3("Problems at write: " << ec.message());
return false;
}else
{
m_send_deadline.expires_at(boost::posix_time::pos_infin);
}
}
catch(const boost::system::system_error& er)
{
LOG_ERROR("Some problems at connect, message: " << er.what());
return false;
}
catch(...)
{
LOG_ERROR("Some fatal problems.");
return false;
}
return true;
}
private:
boost::asio::deadline_timer m_send_deadline;
void check_send_deadline()
{
// Check whether the deadline has passed. We compare the deadline against
// the current time since a new asynchronous operation may have moved the
// deadline before this actor had a chance to run.
if (m_send_deadline.expires_at() <= boost::asio::deadline_timer::traits_type::now())
{
// The deadline has passed. The socket is closed so that any outstanding
// asynchronous operations are cancelled. This allows the blocked
// connect(), read_line() or write_line() functions to return.
LOG_PRINT_L3("Timed out socket");
m_ssl_socket->next_layer().close();
// There is no longer an active deadline. The expiry is set to positive
// infinity so that the actor takes no action until a new deadline is set.
m_send_deadline.expires_at(boost::posix_time::pos_infin);
}
// Put the actor back to sleep.
m_send_deadline.async_wait(boost::bind(&async_blocked_mode_client::check_send_deadline, this));
}
};
}
}
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