ceph/src/boost/libs/asio/example/cpp03/socks4/sync_client.cpp

   1 //
   2 // sync_client.cpp
   3 // ~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2017 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #include <iostream>
  12 #include <iomanip>
  13 #include <ostream>
  14 #include <string>
  15 #include <boost/asio.hpp>
  16 #include <boost/array.hpp>
  17 #include "socks4.hpp"
  18
  19 using boost::asio::ip::tcp;
  20
  21 int main(int argc, char* argv[])
  22 {
  23   try
  24   {
  25     if (argc != 4)
  26     {
  27       std::cout << "Usage: sync_client <socks4server> <socks4port> <user>\n";
  28       std::cout << "Examples:\n";
  29       std::cout << "  sync_client 127.0.0.1 1080 chris\n";
  30       std::cout << "  sync_client localhost socks chris\n";
  31       return 1;
  32     }
  33
  34     boost::asio::io_context io_context;
  35
  36     // Get a list of endpoints corresponding to the SOCKS 4 server name.
  37     tcp::resolver resolver(io_context);
  38     tcp::resolver::results_type endpoints = resolver.resolve(argv[1], argv[2]);
  39
  40     // Try each endpoint until we successfully establish a connection to the
  41     // SOCKS 4 server.
  42     tcp::socket socket(io_context);
  43     boost::asio::connect(socket, endpoints);
  44
  45     // Get an endpoint for the Boost website. This will be passed to the SOCKS
  46     // 4 server. Explicitly specify IPv4 since SOCKS 4 does not support IPv6.
  47     tcp::endpoint http_endpoint =
  48       *resolver.resolve(tcp::v4(), "www.boost.org", "http").begin();
  49
  50     // Send the request to the SOCKS 4 server.
  51     socks4::request socks_request(
  52         socks4::request::connect, http_endpoint, argv[3]);
  53     boost::asio::write(socket, socks_request.buffers());
  54
  55     // Receive a response from the SOCKS 4 server.
  56     socks4::reply socks_reply;
  57     boost::asio::read(socket, socks_reply.buffers());
  58
  59     // Check whether we successfully negotiated with the SOCKS 4 server.
  60     if (!socks_reply.success())
  61     {
  62       std::cout << "Connection failed.\n";
  63       std::cout << "status = 0x" << std::hex << socks_reply.status();
  64       return 1;
  65     }
  66
  67     // Form the HTTP request. We specify the "Connection: close" header so that
  68     // the server will close the socket after transmitting the response. This
  69     // will allow us to treat all data up until the EOF as the response.
  70     std::string request =
  71       "GET / HTTP/1.0\r\n"
  72       "Host: www.boost.org\r\n"
  73       "Accept: */*\r\n"
  74       "Connection: close\r\n\r\n";
  75
  76     // Send the HTTP request.
  77     boost::asio::write(socket, boost::asio::buffer(request));
  78
  79     // Read until EOF, writing data to output as we go.
  80     boost::array<char, 512> response;
  81     boost::system::error_code error;
  82     while (std::size_t s = socket.read_some(
  83           boost::asio::buffer(response), error))
  84       std::cout.write(response.data(), s);
  85     if (error != boost::asio::error::eof)
  86       throw boost::system::system_error(error);
  87   }
  88   catch (std::exception& e)
  89   {
  90     std::cout << "Exception: " << e.what() << "\n";
  91   }
  92
  93   return 0;
  94 }