doc/html/boost_asio/example/cpp03/socks4/sync_client.cpp
//
// sync_client.cpp
// ~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include <iostream>
#include <iomanip>
#include <ostream>
#include <string>
#include <boost/asio.hpp>
#include <boost/array.hpp>
#include "socks4.hpp"
using boost::asio::ip::tcp;
int main(int argc, char* argv[])
{
try
{
if (argc != 4)
{
std::cout << "Usage: sync_client <socks4server> <socks4port> <user>\n";
std::cout << "Examples:\n";
std::cout << " sync_client 127.0.0.1 1080 chris\n";
std::cout << " sync_client localhost socks chris\n";
return 1;
}
boost::asio::io_context io_context;
// Get a list of endpoints corresponding to the SOCKS 4 server name.
tcp::resolver resolver(io_context);
tcp::resolver::results_type endpoints = resolver.resolve(argv[1], argv[2]);
// Try each endpoint until we successfully establish a connection to the
// SOCKS 4 server.
tcp::socket socket(io_context);
boost::asio::connect(socket, endpoints);
// Get an endpoint for the Boost website. This will be passed to the SOCKS
// 4 server. Explicitly specify IPv4 since SOCKS 4 does not support IPv6.
tcp::endpoint http_endpoint =
*resolver.resolve(tcp::v4(), "www.boost.org", "http").begin();
// Send the request to the SOCKS 4 server.
socks4::request socks_request(
socks4::request::connect, http_endpoint, argv[3]);
boost::asio::write(socket, socks_request.buffers());
// Receive a response from the SOCKS 4 server.
socks4::reply socks_reply;
boost::asio::read(socket, socks_reply.buffers());
// Check whether we successfully negotiated with the SOCKS 4 server.
if (!socks_reply.success())
{
std::cout << "Connection failed.\n";
std::cout << "status = 0x" << std::hex << socks_reply.status();
return 1;
}
// Form the HTTP request. We specify the "Connection: close" header so that
// the server will close the socket after transmitting the response. This
// will allow us to treat all data up until the EOF as the response.
std::string request =
"GET / HTTP/1.0\r\n"
"Host: www.boost.org\r\n"
"Accept: */*\r\n"
"Connection: close\r\n\r\n";
// Send the HTTP request.
boost::asio::write(socket, boost::asio::buffer(request));
// Read until EOF, writing data to output as we go.
boost::array<char, 512> response;
boost::system::error_code error;
while (std::size_t s = socket.read_some(
boost::asio::buffer(response), error))
std::cout.write(response.data(), s);
if (error != boost::asio::error::eof)
throw boost::system::system_error(error);
}
catch (std::exception& e)
{
std::cout << "Exception: " << e.what() << "\n";
}
return 0;
}