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116 lines
3.7 KiB
C++
116 lines
3.7 KiB
C++
//
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// Copyright (c) 2020 Kasper Laudrup (laudrup at stacktrace dot dk)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#include <boost/beast/core.hpp>
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#include <boost/beast/http.hpp>
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#include <boost/beast/version.hpp>
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#include <boost/wintls.hpp>
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#include <iostream>
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#include <regex>
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#include <string>
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namespace beast = boost::beast; // from <boost/beast.hpp>
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namespace http = beast::http; // from <boost/beast/http.hpp>
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namespace net = boost::asio; // from <boost/asio.hpp>
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namespace ssl = boost::wintls; // from <boost/wintls/wintls.hpp>
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using tcp = boost::asio::ip::tcp; // from <boost/asio/ip/tcp.hpp>
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//------------------------------------------------------------------------------
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// Performs an HTTP GET and prints the response
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int main(int argc, char** argv) {
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try {
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// Exactly one command line argument required - the HTTPS URL
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if(argc != 2) {
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std::cerr << "Usage: " << argv[0] << " [HTTPS_URL]\n\n";
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std::cerr << "Example: " << argv[0] << " https://www.boost.org/LICENSE_1_0.txt\n";
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return EXIT_FAILURE;
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}
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const std::string url{argv[1]};
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// Very basic URL matching. Not a full URL validator.
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std::regex re("https://([^/$:]+):?([^/$]*)(/?.*)");
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std::smatch what;
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if(!regex_match(url, what, re)) {
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std::cerr << "Invalid or unsupported URL: " << url << "\n";
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return EXIT_FAILURE;
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}
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// Get the relevant parts of the URL
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const std::string host = std::string(what[1]);
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// Use default HTTPS port (443) if not specified
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const std::string port = what[2].length() > 0 ? what[2].str() : "443";
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// Use default path ('/') if not specified
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const std::string path = what[3].length() > 0 ? what[3].str() : "/";
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// Use HTTP/1.1
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const int version = 11;
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// The io_context is required for all I/O
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net::io_context ioc;
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// The SSL context is required, and holds certificates
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ssl::context ctx{boost::wintls::method::system_default};
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// Use the operating systems default certificates for verification
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ctx.use_default_certificates(true);
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// Verify the remote server's certificate
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ctx.verify_server_certificate(true);
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// Construct the TLS stream with the parameters from the context
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ssl::stream<beast::tcp_stream> stream(ioc, ctx);
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// Set SNI hostname (many hosts need this to handshake successfully)
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stream.set_server_hostname(host);
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// Enable Check whether the Server Certificate was revoked
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stream.set_certificate_revocation_check(true);
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// Look up the domain name
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tcp::resolver resolver(ioc);
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auto const results = resolver.resolve(host, port);
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// Make the connection on the IP address we get from a lookup
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beast::get_lowest_layer(stream).connect(results);
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// Perform the TLS handshake
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stream.handshake(boost::wintls::handshake_type::client);
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// Set up an HTTP GET request message
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http::request<http::string_body> req{http::verb::get, path, version};
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req.set(http::field::host, host);
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req.set(http::field::user_agent, BOOST_BEAST_VERSION_STRING);
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// Send the HTTP request to the remote host
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http::write(stream, req);
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// This buffer is used for reading and must be persisted
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beast::flat_buffer buffer;
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// Declare a container to hold the response
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http::response<http::dynamic_body> res;
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// Receive the HTTP response
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http::read(stream, buffer, res);
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// Write the message to standard out
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std::cout << res << std::endl;
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// Shutdown the TLS connection
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stream.shutdown();
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} catch(std::exception const& e) {
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std::cerr << "Error: " << e.what() << std::endl;
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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