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server.cpp
3597 lines (3186 loc) · 122 KB
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server.cpp
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/*
Copyright (C) 2003 - 2013 by David White <dave@whitevine.net>
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.
*/
/**
* @file
* Wesnoth-Server, for multiplayer-games.
*/
#include "server.hpp"
#include "../global.hpp"
#include "../config.hpp"
#include "../game_config.hpp"
#include "../log.hpp"
#include "../map.hpp" // gamemap::MAX_PLAYERS
#include "../network.hpp"
#include "../filesystem.hpp"
#include "../multiplayer_error_codes.hpp"
#include "../serialization/parser.hpp"
#include "../serialization/preprocessor.hpp"
#include "../serialization/string_utils.hpp"
#include "../util.hpp"
#include "game.hpp"
#include "input_stream.hpp"
#include "metrics.hpp"
#include "player.hpp"
#include "proxy.hpp"
#include "simple_wml.hpp"
#include "ban.hpp"
#include "user_handler.hpp"
#include "sample_user_handler.hpp"
#ifdef HAVE_MYSQLPP
#include "forum_user_handler.hpp"
#endif
#include <boost/bind.hpp>
#include <boost/scoped_ptr.hpp>
#include <boost/scoped_array.hpp>
#include <boost/foreach.hpp>
#include <boost/make_shared.hpp>
#include <boost/utility.hpp>
#include <algorithm>
#include <cassert>
#include <cerrno>
#include <cstdlib>
#include <iomanip>
#include <iostream>
#include <map>
#include <set>
#include <sstream>
#include <vector>
#include <queue>
#include <csignal>
#ifndef _WIN32
#include <sys/times.h>
namespace {
clock_t get_cpu_time(bool active) {
if(!active) {
return 0;
}
struct tms buf;
times(&buf);
return buf.tms_utime + buf.tms_stime;
}
}
#else
// on Windows we don't calculate CPU time
clock_t get_cpu_time(bool /*active*/) {
return 0;
}
#endif
namespace {
bool match_user(std::pair<network::connection, wesnothd::player> pl, const std::string& username, const std::string& ip) {
return pl.second.name() == username && network::ip_address(pl.first) == ip;
}
}
static lg::log_domain log_server("server");
/**
* fatal and directly server related errors/warnings,
* ie not caused by erroneous client data
*/
#define ERR_SERVER LOG_STREAM(err, log_server)
/** clients send wrong/unexpected data */
#define WRN_SERVER LOG_STREAM(warn, log_server)
/** normal events */
#define LOG_SERVER LOG_STREAM(info, log_server)
#define DBG_SERVER LOG_STREAM(debug, log_server)
static lg::log_domain log_config("config");
#define ERR_CONFIG LOG_STREAM(err, log_config)
#define WRN_CONFIG LOG_STREAM(warn, log_config)
//compatibility code for MS compilers
#ifndef SIGHUP
#define SIGHUP 20
#endif
/** @todo FIXME: should define SIGINT here too, but to what? */
sig_atomic_t config_reload = 0;
#ifndef _MSC_VER
static void reload_config(int signal) {
assert(signal == SIGHUP);
config_reload = 1;
}
#endif
static void exit_sigint(int signal) {
assert(signal == SIGINT);
LOG_SERVER << "SIGINT caught, exiting without cleanup immediately.\n";
exit(128 + SIGINT);
}
static void exit_sigterm(int signal) {
assert(signal == SIGTERM);
LOG_SERVER << "SIGTERM caught, exiting without cleanup immediately.\n";
exit(128 + SIGTERM);
}
void async_send_error(socket_ptr socket, const std::string& msg, const char* error_code = "");
namespace {
// we take profiling info on every n requests
int request_sample_frequency = 1;
void send_doc(simple_wml::document& doc, network::connection connection, std::string type = "")
{
if (type.empty())
type = doc.root().first_child().to_string();
try {
simple_wml::string_span s = doc.output_compressed();
network::send_raw_data(s.begin(), s.size(), connection, type);
} catch (simple_wml::error& e) {
WRN_CONFIG << __func__ << ": simple_wml error: " << e.message << std::endl;
}
}
bool check_error(const boost::system::error_code& error, socket_ptr socket)
{
if(error) {
ERR_SERVER << socket->remote_endpoint().address().to_string() << "\t" << error.message() << "\n";
return true;
}
return false;
}
template<typename Handler, typename ErrorHandler>
struct HandleDoc
{
Handler handler;
ErrorHandler error_handler;
socket_ptr socket;
union DataSize
{
boost::uint32_t size;
char buf[4];
};
boost::shared_ptr<DataSize> data_size;
boost::shared_ptr<simple_wml::document> doc;
boost::shared_array<char> buffer;
HandleDoc(socket_ptr socket, Handler handler, ErrorHandler error_handler, boost::uint32_t size, boost::shared_ptr<simple_wml::document> doc) :
handler(handler), error_handler(error_handler), socket(socket), data_size(new DataSize), doc(doc)
{
data_size->size = htonl(size);
}
HandleDoc(socket_ptr socket, Handler handler, ErrorHandler error_handler) :
handler(handler), error_handler(error_handler), socket(socket), data_size(new DataSize)
{
}
void operator()(const boost::system::error_code& error, std::size_t)
{
if(check_error(error, socket)) {
error_handler(socket);
return;
}
handler(socket);
}
};
template<typename Handler, typename ErrorHandler>
void async_send_doc(socket_ptr socket, simple_wml::document& doc, Handler handler, ErrorHandler error_handler)
{
try {
boost::shared_ptr<simple_wml::document> doc_ptr(doc.clone());
simple_wml::string_span s = doc_ptr->output_compressed();
std::vector<boost::asio::const_buffer> buffers;
HandleDoc<Handler, ErrorHandler> handle_send_doc(socket, handler, error_handler, s.size(), doc_ptr);
buffers.push_back(boost::asio::buffer(handle_send_doc.data_size->buf, 4));
buffers.push_back(boost::asio::buffer(s.begin(), s.size()));
async_write(*socket, buffers, handle_send_doc);
} catch (simple_wml::error& e) {
WRN_CONFIG << __func__ << ": simple_wml error: " << e.message << std::endl;
}
}
void null_handler(socket_ptr)
{
}
template<typename Handler>
void async_send_doc(socket_ptr socket, simple_wml::document& doc, Handler handler)
{
async_send_doc(socket, doc, handler, null_handler);
}
void async_send_doc(socket_ptr socket, simple_wml::document& doc)
{
async_send_doc(socket, doc, null_handler, null_handler);
}
template<typename Handler, typename ErrorHandler>
struct HandleReceiveDoc : public HandleDoc<Handler, ErrorHandler>
{
std::size_t buf_size;
HandleReceiveDoc(socket_ptr socket, Handler handler, ErrorHandler error_handler) :
HandleDoc<Handler, ErrorHandler>(socket, handler, error_handler)
{
}
void operator()(const boost::system::error_code& error, std::size_t size)
{
if(check_error(error, this->socket)) {
error_handler(this->socket);
return;
}
if(!this->buffer) {
assert(size == 4);
buf_size = ntohl(this->data_size->size);
this->buffer = boost::shared_array<char>(new char[buf_size]);
async_read(*(this->socket), boost::asio::buffer(this->buffer.get(), buf_size), *this);
} else {
simple_wml::string_span compressed_buf(this->buffer.get(), buf_size);
try {
this->doc.reset(new simple_wml::document(compressed_buf));
} catch (simple_wml::error& e) {
WRN_CONFIG << "simple_wml error in received data: " << e.message << std::endl;
async_send_error(this->socket, "Invalid WML received: " + e.message);
return;
}
handler(this->socket, this->doc);
}
}
};
template<typename Handler, typename ErrorHandler>
void async_receive_doc(socket_ptr socket, Handler handler, ErrorHandler error_handler)
{
HandleReceiveDoc<Handler, ErrorHandler> handle_receive_doc(socket, handler, error_handler);
async_read(*socket, boost::asio::buffer(handle_receive_doc.data_size->buf, 4), handle_receive_doc);
}
template<typename Handler>
void async_receive_doc(socket_ptr socket, Handler handler)
{
async_receive_doc(socket, handler, null_handler);
}
void make_add_diff(const simple_wml::node& src, const char* gamelist,
const char* type,
simple_wml::document& out, int index=-1)
{
if (!out.child("gamelist_diff")) {
out.root().add_child("gamelist_diff");
}
simple_wml::node* top = out.child("gamelist_diff");
if(gamelist) {
top = &top->add_child("change_child");
top->set_attr_int("index", 0);
top = &top->add_child("gamelist");
}
simple_wml::node& insert = top->add_child("insert_child");
const simple_wml::node::child_list& children = src.children(type);
assert(!children.empty());
if(index < 0) {
index = children.size() - 1;
}
assert(index < static_cast<int>(children.size()));
insert.set_attr_int("index", index);
children[index]->copy_into(insert.add_child(type));
}
bool make_delete_diff(const simple_wml::node& src,
const char* gamelist,
const char* type,
const simple_wml::node* remove,
simple_wml::document& out)
{
if (!out.child("gamelist_diff")) {
out.root().add_child("gamelist_diff");
}
simple_wml::node* top = out.child("gamelist_diff");
if(gamelist) {
top = &top->add_child("change_child");
top->set_attr_int("index", 0);
top = &top->add_child("gamelist");
}
const simple_wml::node::child_list& children = src.children(type);
const simple_wml::node::child_list::const_iterator itor =
std::find(children.begin(), children.end(), remove);
if(itor == children.end()) {
return false;
}
const int index = itor - children.begin();
simple_wml::node& del = top->add_child("delete_child");
del.set_attr_int("index", index);
del.add_child(type);
return true;
}
bool make_change_diff(const simple_wml::node& src,
const char* gamelist,
const char* type,
const simple_wml::node* item,
simple_wml::document& out)
{
if (!out.child("gamelist_diff")) {
out.root().add_child("gamelist_diff");
}
simple_wml::node* top = out.child("gamelist_diff");
if(gamelist) {
top = &top->add_child("change_child");
top->set_attr_int("index", 0);
top = &top->add_child("gamelist");
}
const simple_wml::node::child_list& children = src.children(type);
const simple_wml::node::child_list::const_iterator itor =
std::find(children.begin(), children.end(), item);
if(itor == children.end()) {
return false;
}
simple_wml::node& diff = *top;
simple_wml::node& del = diff.add_child("delete_child");
const int index = itor - children.begin();
del.set_attr_int("index", index);
del.add_child(type);
//inserts will be processed first by the client, so insert at index+1,
//and then when the delete is processed we'll slide into the right position
simple_wml::node& insert = diff.add_child("insert_child");
insert.set_attr_int("index", index + 1);
children[index]->copy_into(insert.add_child(type));
return true;
}
std::string player_status(wesnothd::player_map::const_iterator pl) {
std::ostringstream out;
const network::connection_stats& stats = network::get_connection_stats(pl->first);
const int time_connected = stats.time_connected / 1000;
const int seconds = time_connected % 60;
const int minutes = (time_connected / 60) % 60;
const int hours = time_connected / (60 * 60);
out << "'" << pl->second.name() << "' @ " << network::ip_address(pl->first)
<< " connected for " << std::setw(2) << hours << ":" << std::setw(2) << minutes << ":" << std::setw(2) << seconds
<< " sent " << stats.bytes_sent << " bytes, received "
<< stats.bytes_received << " bytes";
return out.str();
}
} // namespace
class fps_limiter {
size_t start_ticks_;
size_t ms_per_frame_;
public:
fps_limiter(size_t ms_per_frame = 20) : start_ticks_(0), ms_per_frame_(ms_per_frame)
{}
void limit() {
size_t current_ticks = SDL_GetTicks();
if (current_ticks - start_ticks_ < ms_per_frame_) {
SDL_Delay(ms_per_frame_ - (current_ticks - start_ticks_));
start_ticks_ += ms_per_frame_;
} else {
start_ticks_ = current_ticks;
}
}
void set_ms_per_frame(size_t ms_per_frame)
{
ms_per_frame_ = ms_per_frame;
}
void set_fps(size_t fps)
{
ms_per_frame_ = 1000 / fps;
}
};
static fps_limiter fps_limit_;
namespace {
const std::string denied_msg = "You're not allowed to execute this command.";
const std::string help_msg = "Available commands are: adminmsg <msg>,"
" ban <mask> <time> <reason>, bans [deleted] [<ipmask>], clones,"
" dul|deny_unregistered_login [yes|no], kick <mask> [<reason>],"
" k[ick]ban <mask> <time> <reason>, help, games, metrics,"
" netstats [all], [lobby]msg <message>, motd [<message>],"
" pm|privatemsg <nickname> <message>, requests, sample, searchlog <mask>,"
" signout, stats, status [<mask>], unban <ipmask>\n"
"Specific strings (those not inbetween <> like the command names)"
" are case insensitive.";
}
server::server(int port, const std::string& config_file, size_t min_threads,
size_t max_threads) :
io_service_(),
acceptor_(io_service_),
net_manager_(min_threads, max_threads),
server_(6666),
ban_manager_(),
ip_log_(),
failed_logins_(),
user_handler_(NULL),
seeds_(),
players_(),
ghost_players_(),
games_(),
not_logged_in_(),
rooms_(players_),
room_list_(player_connections_),
input_(),
config_file_(config_file),
cfg_(read_config()),
accepted_versions_(),
redirected_versions_(),
proxy_versions_(),
disallowed_names_(),
admin_passwd_(),
admins_(),
motd_(),
default_max_messages_(0),
default_time_period_(0),
concurrent_connections_(0),
graceful_restart(false),
lan_server_(time(NULL)),
last_user_seen_time_(time(NULL)),
restart_command(),
max_ip_log_size_(0),
uh_name_(),
deny_unregistered_login_(false),
save_replays_(false),
replay_save_path_(),
allow_remote_shutdown_(false),
tor_ip_list_(),
failed_login_limit_(),
failed_login_ban_(),
failed_login_buffer_size_(),
version_query_response_("[version]\n[/version]\n", simple_wml::INIT_COMPRESSED),
login_response_("[mustlogin]\n[/mustlogin]\n", simple_wml::INIT_COMPRESSED),
join_lobby_response_("[join_lobby]\n[/join_lobby]\n", simple_wml::INIT_COMPRESSED),
games_and_users_list_("[gamelist]\n[/gamelist]\n", simple_wml::INIT_STATIC),
metrics_(),
last_ping_(time(NULL)),
last_stats_(last_ping_),
last_uh_clean_(last_ping_),
cmd_handlers_()
{
boost::asio::ip::tcp::endpoint endpoint(boost::asio::ip::tcp::v4(), port);
acceptor_.open(endpoint.protocol());
acceptor_.set_option(boost::asio::ip::tcp::acceptor::reuse_address(true));
acceptor_.bind(endpoint);
acceptor_.listen();
serve();
handshake_response_.connection_num = 42;
setup_handlers();
load_config();
ban_manager_.read();
rooms_.read_rooms();
#ifndef _MSC_VER
signal(SIGHUP, reload_config);
#endif
signal(SIGINT, exit_sigint);
signal(SIGTERM, exit_sigterm);
}
void server::setup_handlers()
{
cmd_handlers_["shut_down"] = &server::shut_down_handler;
cmd_handlers_["restart"] = &server::restart_handler;
cmd_handlers_["sample"] = &server::sample_handler;
cmd_handlers_["help"] = &server::help_handler;
cmd_handlers_["stats"] = &server::stats_handler;
cmd_handlers_["metrics"] = &server::metrics_handler;
cmd_handlers_["requests"] = &server::requests_handler;
cmd_handlers_["games"] = &server::games_handler;
cmd_handlers_["wml"] = &server::wml_handler;
cmd_handlers_["netstats"] = &server::netstats_handler;
cmd_handlers_["report"] = &server::adminmsg_handler;
cmd_handlers_["adminmsg"] = &server::adminmsg_handler;
cmd_handlers_["pm"] = &server::pm_handler;
cmd_handlers_["privatemsg"] = &server::pm_handler;
cmd_handlers_["msg"] = &server::msg_handler;
cmd_handlers_["lobbymsg"] = &server::msg_handler;
cmd_handlers_["status"] = &server::status_handler;
cmd_handlers_["clones"] = &server::clones_handler;
cmd_handlers_["bans"] = &server::bans_handler;
cmd_handlers_["ban"] = &server::ban_handler;
cmd_handlers_["unban"] = &server::unban_handler;
cmd_handlers_["ungban"] = &server::ungban_handler;
cmd_handlers_["kick"] = &server::kick_handler;
cmd_handlers_["kickban"] = &server::kickban_handler;
cmd_handlers_["kban"] = &server::kickban_handler;
cmd_handlers_["gban"] = &server::gban_handler;
cmd_handlers_["motd"] = &server::motd_handler;
cmd_handlers_["searchlog"] = &server::searchlog_handler;
cmd_handlers_["sl"] = &server::searchlog_handler;
cmd_handlers_["dul"] = &server::dul_handler;
cmd_handlers_["deny_unregistered_login"] = &server::dul_handler;
}
void server::send_error(network::connection sock, const char* msg, const char* error_code) const
{
simple_wml::document doc;
doc.root().add_child("error").set_attr("message", msg);
if(*error_code != '\0') {
doc.child("error")->set_attr("error_code", error_code);
}
send_doc(doc, sock, "error");
}
void async_send_error(socket_ptr socket, const std::string& msg, const char* error_code)
{
simple_wml::document doc;
doc.root().add_child("error").set_attr_dup("message", msg.c_str());
if(*error_code != '\0') {
doc.child("error")->set_attr("error_code", error_code);
}
async_send_doc(socket, doc);
}
void server::send_warning(network::connection sock, const char* msg, const char* warning_code) const
{
simple_wml::document doc;
doc.root().add_child("warning").set_attr("message", msg);
if(*warning_code != '\0') {
doc.child("warning")->set_attr("warning_code", warning_code);
}
send_doc(doc, sock, "warning");
}
void async_send_warning(socket_ptr socket, const std::string& msg, const char* warning_code)
{
simple_wml::document doc;
doc.root().add_child("warning").set_attr_dup("message", msg.c_str());
if(*warning_code != '\0') {
doc.child("warning")->set_attr("warning_code", warning_code);
}
async_send_doc(socket, doc);
}
void server::send_password_request(network::connection sock, const std::string& msg,
const std::string& user, const char* error_code, bool force_confirmation)
{
std::string salt = user_handler_->create_salt();
std::string pepper = user_handler_->create_pepper(user);
std::string spices = pepper + salt;
if(user_handler_->use_phpbb_encryption() && pepper.empty()) {
send_error(sock, "Even though your nickname is registered on this server you "
"cannot log in due to an error in the hashing algorithm. "
"Logging into your forum account on http://forum.wesnoth.org "
"may fix this problem.");
return;
}
seeds_.insert(std::pair<network::connection, std::string>(sock, salt));
simple_wml::document doc;
simple_wml::node& e = doc.root().add_child("error");
e.set_attr("message", msg.c_str());
e.set_attr("password_request", "yes");
e.set_attr("phpbb_encryption", user_handler_->use_phpbb_encryption() ? "yes" : "no");
e.set_attr("salt", spices.c_str());
e.set_attr("force_confirmation", force_confirmation ? "yes" : "no");
if(*error_code != '\0') {
e.set_attr("error_code", error_code);
}
send_doc(doc, sock, "error");
}
config server::read_config() const {
config configuration;
if (config_file_ == "") return configuration;
try {
scoped_istream stream = preprocess_file(config_file_);
read(configuration, *stream);
LOG_SERVER << "Server configuration from file: '" << config_file_
<< "' read.\n";
} catch(config::error& e) {
ERR_CONFIG << "ERROR: Could not read configuration file: '"
<< config_file_ << "': '" << e.message << "'.\n";
}
return configuration;
}
void server::load_config() {
#ifndef FIFODIR
# ifdef _MSC_VER
# pragma message ("No FIFODIR set")
# define FIFODIR "d:/"
# else
# warning "No FIFODIR set"
# ifdef _WIN32
# define FIFODIR "d:/"
# else
# define FIFODIR "/var/run/wesnothd"
# endif
# endif
#endif
const std::string fifo_path = (cfg_["fifo_path"].empty() ? std::string(FIFODIR) + "/socket" : std::string(cfg_["fifo_path"]));
input_.reset();
input_.reset(new input_stream(fifo_path));
save_replays_ = cfg_["save_replays"].to_bool();
replay_save_path_ = cfg_["replay_save_path"].str();
tor_ip_list_ = utils::split(cfg_["tor_ip_list_path"].empty() ? "" : read_file(cfg_["tor_ip_list_path"]), '\n');
admin_passwd_ = cfg_["passwd"].str();
motd_ = cfg_["motd"].str();
lan_server_ = lexical_cast_default<time_t>(cfg_["lan_server"], 0);
uh_name_ = cfg_["user_handler"].str();
deny_unregistered_login_ = cfg_["deny_unregistered_login"].to_bool();
allow_remote_shutdown_ = cfg_["allow_remote_shutdown"].to_bool();
disallowed_names_.clear();
if (cfg_["disallow_names"] == "") {
disallowed_names_.push_back("*admin*");
disallowed_names_.push_back("*admln*");
disallowed_names_.push_back("*server*");
disallowed_names_.push_back("player");
disallowed_names_.push_back("network");
disallowed_names_.push_back("human");
disallowed_names_.push_back("computer");
disallowed_names_.push_back("ai");
disallowed_names_.push_back("ai?");
} else {
disallowed_names_ = utils::split(cfg_["disallow_names"]);
}
default_max_messages_ = cfg_["max_messages"].to_int(4);
default_time_period_ = cfg_["messages_time_period"].to_int(10);
concurrent_connections_ = cfg_["connections_allowed"].to_int(5);
max_ip_log_size_ = cfg_["max_ip_log_size"].to_int(500);
failed_login_limit_ = cfg_["failed_logins_limit"].to_int(10);
failed_login_ban_ = cfg_["failed_logins_ban"].to_int(3600);
failed_login_buffer_size_ = cfg_["failed_logins_buffer_size"].to_int(500);
// Example config line:
// restart_command="./wesnothd-debug -d -c ~/.wesnoth1.5/server.cfg"
// remember to make new one as a daemon or it will block old one
restart_command = cfg_["restart_command"].str();
fps_limit_.set_ms_per_frame(cfg_["ms_per_frame"].to_int(20));
accepted_versions_.clear();
const std::string& versions = cfg_["versions_accepted"];
if (versions.empty() == false) {
accepted_versions_ = utils::split(versions);
} else {
accepted_versions_.push_back(game_config::version);
accepted_versions_.push_back("test");
}
redirected_versions_.clear();
BOOST_FOREACH(const config &redirect, cfg_.child_range("redirect")) {
BOOST_FOREACH(const std::string &version, utils::split(redirect["version"])) {
redirected_versions_[version] = redirect;
}
}
proxy_versions_.clear();
BOOST_FOREACH(const config &proxy, cfg_.child_range("proxy")) {
BOOST_FOREACH(const std::string &version, utils::split(proxy["version"])) {
proxy_versions_[version] = proxy;
}
}
ban_manager_.load_config(cfg_);
rooms_.load_config(cfg_);
// If there is a [user_handler] tag in the config file
// allow nick registration, otherwise we set user_handler_
// to NULL. Thus we must check user_handler_ for not being
// NULL everytime we want to use it.
user_handler_.reset();
if (const config &user_handler = cfg_.child("user_handler")) {
if(uh_name_ == "sample") {
user_handler_.reset(new suh(user_handler));
}
#ifdef HAVE_MYSQLPP
else if(uh_name_ == "forum" || uh_name_.empty()) {
user_handler_.reset(new fuh(user_handler));
}
#endif
// Initiate the mailer class with the [mail] tag
// from the config file
if (user_handler_) user_handler_->init_mailer(cfg_.child("mail"));
}
}
bool server::ip_exceeds_connection_limit(const std::string& ip) const {
if (concurrent_connections_ == 0) return false;
size_t connections = 0;
for (wesnothd::player_map::const_iterator i = players_.begin(); i != players_.end(); ++i) {
if (network::ip_address(i->first) == ip) {
++connections;
}
}
return connections >= concurrent_connections_;
}
std::string server::is_ip_banned(const std::string& ip) const {
if (!tor_ip_list_.empty()) {
if (find(tor_ip_list_.begin(), tor_ip_list_.end(), ip) != tor_ip_list_.end()) return "TOR IP";
}
return ban_manager_.is_ip_banned(ip);
}
void server::dump_stats(const time_t& now) {
last_stats_ = now;
LOG_SERVER << "Statistics:"
<< "\tnumber_of_games = " << games_.size()
<< "\tnumber_of_users = " << players_.size()
<< "\tlobby_users = " << rooms_.lobby().size() << "\n";
}
void server::clean_user_handler(const time_t& now) {
if(!user_handler_) {
return;
}
last_uh_clean_ = now;
user_handler_->clean_up();
}
void server::serve()
{
socket_ptr socket = boost::make_shared<boost::asio::ip::tcp::socket>(boost::ref(io_service_));
acceptor_.async_accept(*socket, boost::bind(&server::accept_connection, this, _1, socket));
}
void server::accept_connection(const boost::system::error_code& error, socket_ptr socket)
{
serve();
if(error) {
ERR_SERVER << "Accept failed: " << error.message() << "\n";
return;
}
const std::string ip = socket->remote_endpoint().address().to_string();
const std::string reason = is_ip_banned(ip);
if (!reason.empty()) {
LOG_SERVER << ip << "\trejected banned user. Reason: " << reason << "\n";
async_send_error(socket, "You are banned. Reason: " + reason);
return;
} else if (ip_exceeds_connection_limit(ip)) {
LOG_SERVER << ip << "\trejected ip due to excessive connections\n";
async_send_error(socket, "Too many connections from your IP.");
return;
} else {
DBG_SERVER << ip << "\tnew connection accepted\n";
serverside_handshake(socket);
}
}
void server::serverside_handshake(socket_ptr socket)
{
boost::shared_array<unsigned char> handshake(new unsigned char[4]);
async_read(
*socket, boost::asio::buffer(handshake.get(), 4),
boost::bind(&server::handle_handshake, this, _1, socket, handshake)
);
}
void server::handle_handshake(const boost::system::error_code& error, socket_ptr socket, boost::shared_array<unsigned char> handshake)
{
if(check_error(error, socket))
return;
if(strcmp((const char*)handshake.get(), "\0\0\0\0") != 0) {
ERR_SERVER << socket->remote_endpoint().address().to_string() << "\tincorrect handshake\n";
return;
}
async_write(
*socket, boost::asio::buffer(handshake_response_.buf, 4),
boost::bind(&server::request_version, this, _1, socket)
);
}
void server::request_version(const boost::system::error_code& error, socket_ptr socket)
{
if(check_error(error, socket))
return;
async_send_doc(socket, version_query_response_,
boost::bind(&server::handle_version, this, _1)
);
}
void server::handle_version(socket_ptr socket)
{
async_receive_doc(socket,
boost::bind(&server::read_version, this, _1, _2)
);
}
void server::read_version(socket_ptr socket, boost::shared_ptr<simple_wml::document> doc)
{
if (const simple_wml::node* const version = doc->child("version")) {
const simple_wml::string_span& version_str_span = (*version)["version"];
const std::string version_str(version_str_span.begin(),
version_str_span.end());
std::vector<std::string>::const_iterator accepted_it;
// Check if it is an accepted version.
for(accepted_it = accepted_versions_.begin();
accepted_it != accepted_versions_.end(); ++accepted_it) {
if (utils::wildcard_string_match(version_str, *accepted_it)) break;
}
if(accepted_it != accepted_versions_.end()) {
LOG_SERVER << socket->remote_endpoint().address().to_string()
<< "\tplayer joined using accepted version " << version_str
<< ":\ttelling them to log in.\n";
async_send_doc(socket, login_response_, boost::bind(&server::login, this, _1));
return;
} else {
LOG_SERVER << socket->remote_endpoint().address().to_string()
<< "\tplayer joined using unknown version " << version_str
<< ":\trejecting them\n";
}
} else {
LOG_SERVER << socket->remote_endpoint().address().to_string()
<< "\tclient didn't send its version: rejecting\n";
}
}
void server::login(socket_ptr socket)
{
async_receive_doc(socket,
boost::bind(&server::handle_login, this, _1, _2)
);
}
void server::handle_login(socket_ptr socket, boost::shared_ptr<simple_wml::document> doc)
{
if(const simple_wml::node* const login = doc->child("login")) {
// Check if the username is valid (all alpha-numeric plus underscore and hyphen)
std::string username = (*login)["username"].to_string();
if (!utils::isvalid_username(username)) {
async_send_error(socket, "The nickname '" + username + "' contains invalid "
"characters. Only alpha-numeric characters, underscores and hyphens"
"are allowed.", MP_INVALID_CHARS_IN_NAME_ERROR);
server::login(socket);
return;
}
if (username.size() > 20) {
async_send_error(socket, "The nickname '" + username + "' is too long. Nicks must be 20 characters or less.",
MP_NAME_TOO_LONG_ERROR);
server::login(socket);
return;
}
// Check if the username is allowed.
for (std::vector<std::string>::const_iterator d_it = disallowed_names_.begin();
d_it != disallowed_names_.end(); ++d_it)
{
if (utils::wildcard_string_match(utils::lowercase(username),
utils::lowercase(*d_it)))
{
async_send_error(socket, "The nickname '" + username + "' is reserved and cannot be used by players",
MP_NAME_RESERVED_ERROR);
server::login(socket);
return;
}
}
// If this is a request for password reminder
if(user_handler_) {
std::string password_reminder = (*login)["password_reminder"].to_string();
if(password_reminder == "yes") {
try {
user_handler_->password_reminder(username);
async_send_error(socket, "Your password reminder email has been sent.");
} catch (user_handler::error& e) {
async_send_error(socket, "There was an error sending your password reminder email. The error message was: " +
e.message);
}
return;
}
}
// Check the username isn't already taken
PlayerMap::right_iterator p = player_connections_.right.find(username);
// Check for password
// Current login procedure for registered nicks is:
// - Client asks to log in with a particular nick
// - Server sends client random salt plus some info
// generated from the original hash that is required to
// regenerate the hash
// - Client generates hash for the user provided password
// and mixes it with the received random salt
// - Server received salted hash, salts the valid hash with
// the same salt it sent to the client and compares the results
bool registered = false;
if(user_handler_) {
std::string password = (*login)["password"].to_string();
const bool exists = user_handler_->user_exists(username);
// This name is registered but the account is not active
if(exists && !user_handler_->user_is_active(username)) {
async_send_warning(socket, "The nickname '" + username + "' is inactive. You cannot claim ownership of this "
"nickname until you activate your account via email or ask an administrator to do it for you.", MP_NAME_INACTIVE_WARNING);
//registered = false;
}
else if(exists) {
// This name is registered and no password provided
if(password.empty()) {
if(p == player_connections_.right.end()) {
send_password_request(socket, "The nickname '" + username +"' is registered on this server.",
username, MP_PASSWORD_REQUEST);
} else {
send_password_request(socket, "The nickname '" + username + "' is registered on this server."
"\n\nWARNING: There is already a client using this username, "
"logging in will cause that client to be kicked!",
username, MP_PASSWORD_REQUEST_FOR_LOGGED_IN_NAME, true);
}
return;
}
// A password (or hashed password) was provided, however
// there is no seed
if(seeds_[(long int)socket.get()].empty()) {
send_password_request(socket, "Please try again.", username, MP_NO_SEED_ERROR);
return;
}
// This name is registered and an incorrect password provided
else if(!(user_handler_->login(username, password, seeds_[(unsigned long)socket.get()]))) {
const time_t now = time(NULL);
// Reset the random seed
seeds_.erase((unsigned long)socket.get());
login_log login_ip = login_log(network::ip_address((long int)socket.get()), 0, now);
std::deque<login_log>::iterator i = std::find(failed_logins_.begin(), failed_logins_.end(), login_ip);
if(i == failed_logins_.end()) {
failed_logins_.push_back(login_ip);
i = --failed_logins_.end();