server/proxy.cpp

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/* $Id: proxy.cpp 52533 2012-01-07 02:35:17Z shadowmaster $ */
/*
   Copyright (C) 2007 - 2012
   Part of the Battle for Wesnoth Project http://www.wesnoth.org/

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY.

   See the COPYING file for more details.
*/

#include "global.hpp"

#include "proxy.hpp"


namespace
{

typedef std::map<network::connection,network::connection> connection_map;
connection_map clients_to_servers, servers_to_clients;

network::connection find_peer(network::connection sock)
{
    const connection_map::const_iterator i = clients_to_servers.find(sock);
    if(i == clients_to_servers.end()) {
        const connection_map::const_iterator i = servers_to_clients.find(sock);
        if(i == servers_to_clients.end()) {
            return 0;
        } else {
            return i->second;
        }
    } else {
        return i->second;
    }
}

}

namespace proxy
{

void create_proxy(network::connection sock, const std::string& host, int port)
{
    const network::connection peer = network::connect(host,port);
    if(!peer) {
        network::disconnect(sock);
    } else {
        clients_to_servers.insert(std::pair<network::connection,network::connection>(sock,peer));
        servers_to_clients.insert(std::pair<network::connection,network::connection>(peer,sock));
    }
}

bool is_proxy(network::connection sock)
{
    return clients_to_servers.count(sock) || servers_to_clients.count(sock);
}

void disconnect(network::connection sock)
{
    const network::connection peer = find_peer(sock);
    if(!peer) {
        return;
    }

    servers_to_clients.erase(sock);
    servers_to_clients.erase(peer);
    clients_to_servers.erase(sock);
    clients_to_servers.erase(peer);

    network::disconnect(peer);
}

void received_data(network::connection sock, simple_wml::document& data)
{
    const network::connection peer = find_peer(sock);
    if(!peer) {
        return;
    }

    const simple_wml::string_span& output = data.output_compressed();
    network::send_raw_data(output.begin(), output.size(), peer);
}

}