How to create a boost ssl iostream?

Question

I\'m adding HTTPS support to code that does input and output using boost tcp::iostream (acting as an HTTP server).

I\'ve found examples (and have a working toy HTTPS

Answer 1

ssl::stream could be wrapped with boost::iostreams / bidirectional to mimic similar behaviours as tcp::iostream. flushing output before further reading seems cannot be avoided.

#include 
#include 
#include 
#include 
#include 
#include 

namespace bios = boost::iostreams;
namespace asio = boost::asio;
namespace ssl = boost::asio::ssl;

using std::string;
using boost::asio::ip::tcp;
using boost::system::system_error;
using boost::system::error_code;

int parse_url(const std::string &s,
    std::string& proto, std::string& host, std::string& path)
{
    std::smatch m;
    bool found = regex_search(s, m, std::regex("^(http[s]?)://([^/]*)(.*)$"));
    if (m.size() != 4)
        return -1;
    proto = m[1].str();
    host = m[2].str();
    path = m[3].str();
    return 0;
}

void get_page(std::iostream& s, const string& host, const string& path)
{ 
    s << "GET " <<  path << " HTTP/1.0\r\n"
        << "Host: " << host << "\r\n"
        << "Accept: */*\r\n"
        << "Connection: close\r\n\r\n" << std::flush;

    std::cout << s.rdbuf() << std::endl;;
}

typedef ssl::stream ssl_socket;
class ssl_wrapper : public bios::device
{
    ssl_socket& sock;
public:
    typedef char char_type;

    ssl_wrapper(ssl_socket& sock) : sock(sock) {}

    std::streamsize read(char_type* s, std::streamsize n) {
        error_code ec;          
        auto rc = asio::read(sock, asio::buffer(s,n), ec);
        return rc;
    }
    std::streamsize write(const char_type* s, std::streamsize n) {
        return asio::write(sock, asio::buffer(s,n));
    }
};

int main(int argc, char* argv[])
{
    std::string proto, host, path;
    if (argc!= 2 || parse_url(argv[1], proto, host, path)!=0)
        return EXIT_FAILURE;
    try {
        if (proto != "https") {
            tcp::iostream s(host, proto);
            s.expires_from_now(boost::posix_time::seconds(60));
            get_page(s, host, path);
        } else {
            asio::io_service ios;

            tcp::resolver resolver(ios);
            tcp::resolver::query query(host, "https");
            tcp::resolver::iterator endpoint_iterator = 
               resolver.resolve(query);

            ssl::context ctx(ssl::context::sslv23);
            ctx.set_default_verify_paths();
            ssl_socket socket(ios, ctx);

            asio::connect(socket.lowest_layer(), endpoint_iterator);

            socket.set_verify_mode(ssl::verify_none);
            socket.set_verify_callback(ssl::rfc2818_verification(host));
            socket.handshake(ssl_socket::client);

            bios::stream ss(socket);
            get_page(ss, host, path);
        }
    } catch (const std::exception& e) {
        std::cout << "Exception: " << e.what() << "\n";
    }
}