1 //
2 // sync_client.cpp
3 // ~~~~~~~~~~~~~~~
4 //
5 // Copyright (c) 2003-2021 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
main(int argc,char * argv[])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 }
95