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ReSkate/Server/server_host.cpp
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#include "server_host.h"
#include "server_text.h"
#include "Extension/Multiplayer/Net/wire_codec.h"
#include "Extension/Multiplayer/developer_identity.h"
#include "Extension/Multiplayer/Session/monotonic_clock.h"
#include "Engine/Core/Text/word_filter.h"
#include "Engine/Game/Build/supported_build.h"
#include "Engine/Game/World/world_names.h"
#include "Engine/Game/World/park_randomization.h"
#ifdef _WIN32
#include <Windows.h>
#include <bcrypt.h>
#else
#include <fstream>
#include <random>
#endif
#include <algorithm>
#include <cmath>
#include <array>
#include <charconv>
#include <ctime>
#include <stdexcept>
namespace dingosdk::server {
namespace {
std::uint64_t nonce() {
std::uint64_t value{};
#ifdef _WIN32
if (BCryptGenRandom(nullptr, reinterpret_cast<PUCHAR>(&value), sizeof(value), BCRYPT_USE_SYSTEM_PREFERRED_RNG) < 0 ||
!value)
throw std::runtime_error("Cannot generate a session code.");
#else
// Preferred: OS entropy; fallback to std::random_device for containers without getrandom.
std::ifstream urandom("/dev/urandom", std::ios::binary);
if (urandom.read(reinterpret_cast<char *>(&value), sizeof(value)) && value) return value;
std::random_device device;
// Four rounds of sixteen bits each. Stopping as soon as `value` was
// non-zero would leave a session code with sixteen bits of entropy.
for (int i = 0; i < 4; ++i)
value = (value << 16) ^ static_cast<std::uint64_t>(device() & 0xFFFF);
if (!value) throw std::runtime_error("Cannot generate a session code.");
#endif
return value;
}
constexpr std::string_view help_text =
"status | players | say <text> | msg <player> <text> | msg-party <player> <text> | msg-admins <text> | kick <player> | ban <player or SteamID64> [name] | unban <SteamID64> | bans\n"
"map <name, e.g. San Vansterdam> | maps | name <text> | password <text|off> | welcome <text|off> | listed on|off\n"
"tps 20|30|60|120 | voice on|off | voice-range <50-1000> | distances <full> <half> <half-return> <low>\n"
"placement everyone|admins|nobody | clear-objects | noclip on|off | nobail on|off | boosts on|off | tuning on|off\n"
"tpall [player] | tphere <player> | votes [map|kick|tod on|off|<percent>] | vote-cancel\n"
"map-pool [add|remove <map>|clear] | rotation [<minutes>|off]\n"
"park <lot> <layout> | park random | layer-sync on|off | layer <key> default|on|off | tod <time|default>\n"
"activity-log on|off | announce-throwdowns on|off | parties [on|off] | party-size <2-8> | speed-check off|warn|kick\n"
"score-check [off|warn|kick] | score-allow [<fingerprint>|remove <fingerprint>]\n"
"admin add|remove <SteamID64> | admins | update | quit";
} // namespace
Host::Host(ServerConfig &config, SteamTransport &transport, Log log)
: config_(config), transport_(transport), log_(std::move(log)),
activity_([this](const std::string &text) { if (config_.activity_log) log_(text); },
[this](std::uint64_t id) {
const auto *guest = find(id);
return guest && guest->handshaken ? guest_name(*guest) : std::string{};
},
[this](const std::string &text) { if (config_.announce_throwdowns) send_chat(text); }) {
parties_.set_limit(config_.party_size);
}
Host::Guest *Host::find(std::uint64_t id) {
const auto found = guests_.find(id);
return found == guests_.end() ? nullptr : found->second.get();
}
Packet Host::packet(PacketKind kind, std::uint64_t now) {
Packet p;
p.kind = kind;
p.sequence = ++sequence_;
p.session = secret_;
p.epoch = epoch_;
p.map = map_;
p.time_us = now;
p.source = id_;
p.world = world_;
p.tps = config_.tps;
p.pose_interval_us = multiplayer_pose_interval(config_.tps);
p.build = supported_build::game_sha256_bytes;
return p;
}
std::string Host::guest_name(const Guest &g) const {
return g.member.name.empty() ? std::to_string(g.member.id) : g.member.name;
}
// The name a joining player is known by here. It is the one their game sent, which the
// server cannot check against Steam, so it is made safe to show and to type: never blank,
// never the server's or ReSkate's own, never read as a SteamID64 by kick or ban (which take
// a number as one), and never the same as another player's.
std::string Host::player_name(std::string_view wanted, std::uint64_t id) const {
const auto fallback = "Player " + std::to_string(id % 10000);
std::string name(trim(wanted));
cut_text(name, max_member_name);
// Names show in every player's roster, nametags and party UI.
if (text::contains_bad_words(name)) name = text::mask_bad_words(name);
const auto folded = lower(name);
const auto first = split(name).first;
const bool digits = !first.empty() && std::all_of(first.begin(), first.end(), [](char c) { return c >= '0' && c <= '9'; });
if (name.empty() || folded == "server" || folded == "reskate" || folded == lower(config_.name)) name = fallback;
else if (digits) name = "Player " + name;
const auto taken = [&](const std::string &candidate) {
return std::any_of(guests_.begin(), guests_.end(), [&](const auto &entry) {
return entry.first != id && entry.second->handshaken && lower(entry.second->member.name) == lower(candidate);
});
};
auto unique = name;
for (unsigned copy = 2; taken(unique) && copy < 1000; ++copy) unique = name + " (" + std::to_string(copy) + ")";
cut_text(unique, 128);
return unique;
}
bool Host::is_admin(std::uint64_t id) const {
return std::find(config_.admins.begin(), config_.admins.end(), id) != config_.admins.end();
}
bool Host::is_banned(std::uint64_t id) const {
return std::any_of(config_.bans.begin(), config_.bans.end(), [&](const auto &ban) { return ban.id == id; });
}
void Host::save() {
try {
save_config(config_);
} catch (const std::exception &e) {
log_(std::string("Could not save the config: ") + e.what());
}
}
std::string Host::invite() const { return format_invite({id_, secret_}); }
std::string Host::map_name() const { return map_label(config_.map); }
std::string Host::wire_map_label() const { // players without the map's mod still see its name
auto label = map_name();
cut_text(label, max_member_name);
return valid_map_label(label) ? label : std::string{};
}
unsigned Host::players() const {
return static_cast<unsigned>(std::count_if(guests_.begin(), guests_.end(), [](const auto &g) { return g.second->handshaken; }));
}
bool Host::start(std::string &error) {
if (!transport_.host(capacity())) {
error = transport_.status().detail;
return false;
}
id_ = transport_.status().local_id;
secret_ = nonce();
epoch_ = nonce();
world_ = 1;
map_ = map_hash(map_destination(config_.map));
password_ = config_.password.empty() ? std::nullopt : password_key(config_.password, secret_);
voice_policy_ = {config_.voice_chat, 1};
apply_layers();
running_ = true;
roster_dirty_ = true;
return true;
}
void Host::stop(const std::string &reason) {
if (!running_) return;
const auto away = packet(PacketKind::away, now_us());
for (auto &[id, guest] : guests_)
if (guest->handshaken) send_packet(*guest, away, true, false);
for (auto it = guests_.begin(); it != guests_.end();) transport_.disconnect((it++)->first, reason.c_str());
guests_.clear();
transport_.stop();
running_ = false;
}
void Host::apply_layers() {
layers_ = default_world_layers();
if (!config_.world_layer_sync) return;
for (std::size_t i = 0; i < world_layers().size(); ++i) {
const auto found = config_.layers.find(world_layers()[i].key);
if (found != config_.layers.end() && valid_world_layer_mode(found->second)) layers_[i] = found->second;
}
}
// ---- Sending ---------------------------------------------------------------------------------
bool Host::send_packet(Guest &g, const Packet &p, bool reliable, bool fresh, std::span<const std::uint8_t> raw,
std::span<const std::uint8_t> wire) {
auto update = raw.empty() ? g.sender.prepare(p) : g.sender.prepare(p, raw, wire);
// A packet that cannot be built for anyone is its source's fault, never this recipient's:
// nothing is sent, and the recipient is not treated as unreachable.
if (update.bytes.empty()) return true;
// A stream and its reliable delta references must always use the same lane.
if (!transport_.send(g.member.id, update.bytes, reliable || update.establishes_baseline(), fresh, traffic_lane(p.kind)))
return false;
g.sender.sent(p, std::move(update));
return true;
}
void Host::send_required(Guest &g, const std::vector<std::uint8_t> &bytes) {
if (bytes.empty()) return;
const auto p = decode_wire(bytes);
if (!p || !send_packet(g, *p, true, false))
transport_.disconnect(g.member.id, "Cannot deliver required session data. Join again.");
}
void Host::broadcast(const Packet &packet, bool reliable, bool fresh, std::uint64_t except) {
const auto *source = find(packet.source);
struct Encoded { Packet packet; std::vector<std::uint8_t> raw, wire; };
std::array<Encoded, 3> encoded;
const bool gameplay = packet.kind == PacketKind::pose || packet.kind == PacketKind::audio ||
packet.kind == PacketKind::voice || packet.kind == PacketKind::cosmetics;
for (auto &[id, guest] : guests_) {
auto &p = *guest;
if (!p.handshaken || id == except || (gameplay && !p.world_ready)) continue;
if (packet.kind == PacketKind::voice) {
if (!voice_policy_.accepts(packet.voice)) continue;
// Each listener fades voices by their own hearing distance; the server
// forwards proximity voice within its range. Unknown positions go through.
if (packet.voice.distance > 0.f && source) {
const bool known = source->latest_root && p.latest_root && p.pose_arrival &&
now_ - p.pose_arrival <= 3000000 && source->pose_arrival &&
now_ - source->pose_arrival <= 3000000;
if (known && voice_gain(source->latest_root->position, p.latest_root->position, config_.voice_range) <= 0.f)
continue;
}
}
// Frequent gameplay streams skip the server once the receiver confirms a direct route.
if (source && (packet.kind == PacketKind::pose || packet.kind == PacketKind::audio) &&
!needs_relay(p.direct_routes, p.route_reported, source->member, now_))
continue;
PoseDelivery *delivery{};
std::uint32_t interval = multiplayer_pose_interval(config_.tps);
if (packet.kind == PacketKind::pose) {
auto entry = std::find_if(p.pose_delivery.begin(), p.pose_delivery.end(),
[&](const auto &v) { return v.source == packet.source; });
if (entry == p.pose_delivery.end())
entry = std::min_element(p.pose_delivery.begin(), p.pose_delivery.end(),
[](const auto &a, const auto &b) { return a.last_sent < b.last_sent; });
delivery = &*entry;
if (delivery->source != packet.source || delivery->epoch != packet.epoch)
*delivery = {packet.source, packet.epoch, 0, interval};
if (p.latest_root && p.pose_arrival && now_ >= p.pose_arrival && now_ - p.pose_arrival <= 1000000) {
float distance{};
for (unsigned i = 0; i < 3; ++i) {
const auto d = p.latest_root->position[i] - packet.pose.root.position[i];
distance += d * d;
}
interval = pose_interval(distance, delivery->interval_us, config_.distances, config_.tps);
}
if (delivery->interval_us != interval) delivery->next_source_time = 0;
delivery->interval_us = interval;
if (interval > multiplayer_pose_interval(config_.tps) && packet.time_us < delivery->next_source_time) continue;
}
const auto variant = interval == 200000 ? 2U : interval == 100000 ? 1U : 0U;
auto &data = encoded[variant];
if (data.raw.empty()) {
data.packet = packet;
data.packet.pose_interval_us = interval;
data.raw = encode(data.packet, true);
data.wire = encode_wire_bytes(data.raw);
}
const bool sent = send_packet(p, data.packet, reliable, fresh, data.raw, data.wire);
if (sent && delivery) {
delivery->last_sent = now_;
advance_pose_deadline(delivery->next_source_time, packet.time_us, interval);
}
if (!sent && reliable && !fresh) transport_.disconnect(id, "Cannot deliver required session data. Join again.");
}
}
void Host::send_roster() {
auto p = packet(PacketKind::roster, now_);
p.voice_policy = voice_policy_;
p.voice_range = config_.voice_range;
p.distances = config_.distances;
p.object_placement = config_.object_placement;
p.guest_noclip = config_.noclip;
p.guest_no_bail = config_.no_bail;
p.guest_boosts = config_.boosts;
p.enforce_tuning = config_.enforce_tuning;
p.server_votes = enabled_votes();
p.object_clears = object_clears_;
// Without the catalog (or with sync off) no layers are sent: every player keeps their own.
p.force_world_layers = config_.world_layer_sync && !world_layers().empty();
if (p.force_world_layers) p.layers = pack_world_layers(layers_);
else p.layers.clear();
p.parks = config_.parks;
p.capacity = capacity();
p.members.push_back({id_, epoch_, config_.name, false});
for (auto &[id, guest] : guests_)
if (guest->handshaken) {
guest->member.admin = is_admin(id);
const auto party = parties_.party_of(id);
const auto *details = parties_.party(party);
guest->member.party = party;
guest->member.party_leader = details && details->leader == id;
guest->member.party_open = guest->member.party_leader && details->open;
guest->member.speeding = guest->speeding;
guest->member.scoring = guest->scoring_flagged;
p.members.push_back(guest->member);
}
// Parties hold only handshaken players (party_request), so this only guards the roster's
// rules: every listed party has two members and one leader.
for (auto &m : p.members)
if (m.party && std::count_if(p.members.begin(), p.members.end(), [&](const Member &o) { return o.party == m.party; }) < 2)
m.party = 0, m.party_leader = m.party_open = false;
for (auto &m : p.members)
if (m.party && std::none_of(p.members.begin(), p.members.end(),
[&](const Member &o) { return o.party == m.party && o.party_leader; }))
m.party_leader = true; // the first listed member of a party missing its leader
broadcast(p, true, false);
roster_dirty_ = false;
last_roster_ = now_;
}
void Host::send_world_state() {
auto state = packet(PacketKind::world_state, now_);
state.destination = map_destination(config_.map);
state.map_label = wire_map_label();
state.world_ready = true; // the server has nothing to load
const auto bytes = encode_wire(state);
for (auto &[id, guest] : guests_)
if (guest->handshaken) send_required(*guest, bytes);
last_world_state_ = now_;
}
void Host::send_chat(std::string_view text, Guest *only) {
auto message = packet(PacketKind::chat, now_);
message.text = clean_chat_text(text);
if (message.text.empty()) return;
if (only) send_packet(*only, message, true, false);
else broadcast(message, true, false);
}
void Host::send_bans(Guest &admin) {
auto list = packet(PacketKind::bans, now_);
list.ban_total = static_cast<std::uint32_t>(config_.bans.size());
// Newest first; a very long list sends only its newest rows.
for (auto ban = config_.bans.rbegin(); ban != config_.bans.rend() && list.bans.size() < max_ban_rows; ++ban) {
auto row = *ban;
while (!row.name.empty() && !valid_member_name(row.name)) row.name.pop_back();
if (row.name.size() > max_member_name) row.name.resize(max_member_name);
while (!valid_member_name(row.name)) row.name.pop_back();
if (individual_steam_id(row.id)) list.bans.push_back(std::move(row));
}
if (send_packet(admin, list, true, false)) admin.bans_sent = bans_revision_;
}
void Host::send_maps(Guest &guest) { // admins: every map and the pool; players: the pool
auto list = packet(PacketKind::maps, now_);
const auto add = [&](const ServerLevel &level) {
if (valid_map_asset(level.asset) && list.maps.size() < max_server_maps) list.maps.push_back(level.asset);
};
if (is_admin(guest.member.id)) {
for (const auto &level : levels()) add(level);
if (!config_.map_pool.empty())
for (const auto *level : pool_levels(config_)) {
const auto at = std::find(list.maps.begin(), list.maps.end(), level->asset);
if (at != list.maps.end()) list.map_pool.push_back(static_cast<std::uint16_t>(at - list.maps.begin()));
}
} else {
for (const auto *level : pool_levels(config_)) add(*level);
}
list.map_rotation = static_cast<std::uint16_t>(std::min(config_.map_rotation, max_map_rotation));
if (send_packet(guest, list, true, false)) guest.maps_sent = true;
}
void Host::change_map(std::string_view map) {
if (!valid_map_destination(map_destination(map_setting(map))))
throw std::invalid_argument("That map does not name a destination.");
// Everything tied to the old world goes; admission and player slots stay.
for (auto &[id, guest] : guests_) {
auto &g = *guest;
auto old = std::exchange(g, Guest{});
g.member = std::move(old.member);
g.handshaken = old.handshaken;
g.map_authorized = old.map_authorized;
g.password_challenge = old.password_challenge;
g.connected_at = old.connected_at;
// Rate limits and anti-cheat flags belong to the player, not the world: clients report
// their scoring only once per session. The speed measurement starts over.
g.budget = old.budget;
g.chat_rate = old.chat_rate;
g.admin_budget = old.admin_budget;
g.throwdown_budget = old.throwdown_budget;
g.party_budget = old.party_budget;
g.scoring_budget = old.scoring_budget;
g.speeding = old.speeding;
g.scoring = old.scoring;
g.scoring_mods = std::move(old.scoring_mods);
g.scoring_flagged = old.scoring_flagged;
g.world_ready = false;
g.travel_since = g.handshaken ? now_ : 0;
g.last_packet = now_;
}
if (++world_ == 0) throw std::runtime_error("Map transition counter exhausted.");
activity_.clear(); // throwdowns end with the world
config_.map = map_setting(map);
map_ = map_hash(map_destination(config_.map));
map_since_ = now_;
rotation_warned_ = false;
travel_started_ = now_;
last_world_state_ = 0;
send_world_state();
roster_dirty_ = true;
}
void Host::drop(std::uint64_t id, const std::string &reason) {
transport_.disconnect(id, reason.c_str());
const auto found = guests_.find(id);
if (found == guests_.end()) return;
const auto name = guest_name(*found->second);
if (found->second->handshaken) {
roster_dirty_ = true;
log_(name + " left (" + reason + ")");
activity_.left(id);
} else {
// Never admitted: it held a player slot meanwhile, so it shows in the log, and an ID
// that keeps failing waits longer each time before its connection is taken again.
const auto failures = join_backoff_.failed(id, now_);
log_("[join] " + std::to_string(id) + " did not finish joining (" + reason + ")" +
(failures > 1 ? ", attempt " + std::to_string(failures) : std::string{}));
}
guests_.erase(found);
party_left(id, name);
// Their vote cooldown stays (tick() drops it once it has run out): leaving and coming
// back does not let a player start another vote sooner.
// One voter fewer, or the player a kick vote was about. Counted in tick(): a passing kick
// vote drops another player, which must not happen inside a caller's walk over guests_.
vote_recount_ = true;
}
// ---- Receiving -------------------------------------------------------------------------------
bool Host::accept_data(Guest &source, const Packet &p) {
bool accepted{};
if (p.kind == PacketKind::cosmetics) {
accepted = source.outfit_budget.accept(now_) && source.appearance.push(p);
if (accepted) source.cosmetic_packet = encode_wire(p);
} else if (p.kind == PacketKind::audio)
accepted = source.sound_budget.accept(now_, p.audio.size()) && source.audio.push(p, now_);
else if (p.kind == PacketKind::pose)
accepted = source.poses.push_validated(p, now_);
// The server never plays anything back: keep only what ordering needs.
if (source.poses.size() > 4 || source.audio.size() > 16) {
source.poses.clear();
source.audio.clear();
}
if (!accepted) return false;
source.last_packet = now_;
if (p.kind == PacketKind::pose) {
source.pose_arrival = now_;
source.latest_root = p.pose.root;
return check_speed(source, p.time_us); // last: a speed-check kick frees `source`
}
return true;
}
void Host::receive(std::uint64_t peer, std::span<const std::uint8_t> bytes, std::uint64_t received_at) {
auto *link = find(peer);
if (!link) return;
// Counted by arrival: after the server was held up, everyone's packets are read at once.
if (!link->budget.accept(received_at ? received_at : now_, bytes.size(), 1U))
return drop(peer, "Peer exceeded the multiplayer packet limit.");
bool missing_reference{};
const auto decoded = link->receiver.receive(bytes, missing_reference, world_);
if (missing_reference) return;
if (!decoded || decoded->session != secret_ || decoded->source != peer)
return drop(peer, "Join code, sender identity, or multiplayer protocol did not match.");
const auto &p = *decoded;
switch (p.kind) {
case PacketKind::world_state: return drop(peer, "Only the server may change the room's map.");
// Sent once the player's game knows, and again if a mod enabled later changes it; not tied to
// a world, so a report crossing a map change still counts.
case PacketKind::scoring: {
if (!link->handshaken || p.epoch != link->member.epoch || !link->scoring_budget.accept(now_, 4)) return;
link->last_packet = now_;
if (link->scoring == p.scoring && link->scoring_mods == p.text) return;
link->scoring = p.scoring;
link->scoring_mods = p.text;
check_scoring(*link);
return;
}
case PacketKind::world_ready: {
if (!link->handshaken || p.epoch != link->member.epoch) return drop(peer, "Invalid map readiness message.");
if (p.world != world_ || p.map != map_ || (link->ready_sequence && !newer_sequence(p.sequence, link->ready_sequence)))
return;
link->ready_sequence = p.sequence;
link->last_packet = now_;
const bool arrived = p.world_ready && !link->world_ready;
if (!p.world_ready && link->world_ready) link->loading_since = now_;
if (arrived && config_.activity_log)
if (const auto since = link->travel_since ? link->travel_since : link->loading_since; since && now_ > since)
log_("[map] " + guest_name(*link) + " finished loading (" + std::to_string((now_ - since) / 1000000) + " s)");
link->world_ready = p.world_ready;
if (p.world_ready) link->travel_since = link->loading_since = 0;
if (arrived)
for (auto &[id, other] : guests_)
if (other->handshaken && id != peer) send_required(*link, other->cosmetic_packet);
return;
}
case PacketKind::map_request: {
if (p.build != supported_build::game_sha256_bytes || (link->member.epoch && link->member.epoch != p.epoch))
return drop(peer, "Invalid map request. Update ReSkate to the server's version and join again.");
if (link->handshaken) return;
if (p.map && p.map != map_) return drop(peer, "The server changed maps while you were joining. Join again.");
link->member.epoch = p.epoch;
bool authorized = !password_;
if (password_) {
if (!link->password_challenge) link->password_challenge = nonce();
if (p.challenge == link->password_challenge) {
const auto proof = password_proof(*password_, secret_, map_, id_, peer, epoch_, p.epoch, link->password_challenge);
if (!proof_matches(proof, p.proof)) return drop(peer, "Incorrect server password.");
authorized = true;
}
}
const bool newly_authorized = authorized && !link->map_authorized;
link->map_authorized |= authorized;
if (newly_authorized || !link->last_map_offer || now_ - link->last_map_offer >= 1000000) {
auto offer = packet(PacketKind::map_offer, now_);
offer.destination = map_destination(config_.map);
offer.map_label = wire_map_label();
offer.challenge = link->password_challenge;
offer.map_authorized = authorized;
send_required(*link, encode_wire(offer));
link->last_map_offer = now_;
}
return;
}
case PacketKind::map_offer:
if (link->handshaken || p.world < world_) return;
return drop(peer, "Only the server offers maps.");
default: break;
}
// A map reload can return to the same asset. The generation keeps late
// poses, audio, cosmetics and control from reviving the old world.
if (p.world != world_) return;
switch (p.kind) {
case PacketKind::peer_hello:
case PacketKind::peer_welcome: return drop(peer, "Direct peer is not admitted to this session.");
case PacketKind::challenge: return drop(peer, "Invalid lobby password challenge.");
case PacketKind::welcome: return drop(peer, "Unexpected multiplayer handshake direction.");
case PacketKind::hello: {
const auto error = greeting_error(p, secret_, map_, supported_build::game_sha256_bytes,
link->handshaken ? link->member.epoch : 0);
if (!error.empty()) return drop(peer, std::string(error));
if (password_ && !link->handshaken) {
if (!link->password_challenge) link->password_challenge = nonce();
if (p.challenge != link->password_challenge) {
auto challenge = packet(PacketKind::challenge, now_);
challenge.challenge = link->password_challenge;
send_required(*link, encode_wire(challenge));
return;
}
const auto proof = password_proof(*password_, secret_, map_, id_, peer, epoch_, p.epoch, link->password_challenge);
if (!proof_matches(proof, p.proof)) return drop(peer, "Incorrect server password.");
}
const bool joined = !link->handshaken;
link->member.epoch = p.epoch;
if (joined) {
link->member.name = player_name(p.text, peer);
join_backoff_.joined(peer);
}
link->handshaken = true;
link->world_ready = true;
link->travel_since = 0;
link->last_packet = now_;
send_required(*link, encode_wire(packet(PacketKind::welcome, now_)));
if (joined) {
send_roster();
for (auto &[id, other] : guests_)
if (other->handshaken && id != peer) send_required(*link, other->cosmetic_packet);
if (!config_.welcome.empty()) send_chat(config_.welcome, link);
log_(guest_name(*link) + " joined (" + std::to_string(peer) + (is_admin(peer) ? ", admin" : "") + "), " +
std::to_string(players()) + "/" + std::to_string(config_.max_players) + " players" +
(link->connected_at && now_ > link->connected_at
? ", loaded in " + std::to_string((now_ - link->connected_at) / 1000000) + " s" : ""));
}
return;
}
case PacketKind::cosmetics: {
auto &pending = link->pending_cosmetics;
std::erase_if(pending, [&](const auto &item) { return now_ - item.received > 10000000; });
const auto found = std::find_if(pending.begin(), pending.end(), [&](const auto &item) {
return item.packet.source == p.source && item.packet.epoch == p.epoch;
});
if (found != pending.end()) {
if (newer_sequence(p.sequence, found->packet.sequence)) *found = {p, now_};
} else {
if (pending.size() >= 4) pending.erase(pending.begin());
pending.push_back({p, now_});
}
return;
}
default: break;
}
if (!link->handshaken || p.map != map_) return;
if (p.kind == PacketKind::routes) {
if (p.epoch != link->member.epoch) return drop(peer, "Invalid direct route report.");
if (!link->route_reported || newer_sequence(p.sequence, link->route_sequence)) {
link->direct_routes.clear();
for (const auto &m : p.members) {
const auto *other = find(m.id);
if (other && other->handshaken && other->member.epoch == m.epoch && m.id != peer)
link->direct_routes.push_back(m);
}
link->route_reported = now_;
link->route_sequence = p.sequence;
}
return;
}
if (p.kind == PacketKind::roster) return drop(peer, "Only the server may publish the player roster.");
if (p.kind == PacketKind::teleport) return drop(peer, "Only the server may teleport players.");
// A listen host's; the server's physics are the game's own.
if (p.kind == PacketKind::physics_tuning || p.kind == PacketKind::physics_extras) return;
if (p.kind == PacketKind::chat) {
if (!routed_source(p, link->member, peer, true, id_) ||
link->chat_rate.accept(now_, p.text, 1) != ChatRate::Verdict::accepted)
return;
link->last_packet = now_;
// "/" starts a command (votes; any server command for admins), answered to the sender only.
if (p.text.front() == '/') {
log_("[command] " + guest_name(*link) + ": /" + loggable(std::string_view(p.text).substr(1)));
chat_command(*link, std::string_view(p.text).substr(1));
return;
}
log_("[chat] " + guest_name(*link) + ": " + p.text);
broadcast(p, true, false, p.source);
return;
}
// Linked throwdowns (Extension/Throwdowns/throwdown_relay.cpp): opaque to the
// server, relayed like chat to everyone else in the same world.
if (p.kind == PacketKind::throwdown) {
if (p.world != world_ || !routed_source(p, link->member, peer, true, id_) || !link->throwdown_budget.accept(now_, 60))
return;
// A player whose tricks score differently takes part in nothing linked: their scores,
// attempts and drops go nowhere, whatever the other players' games would do with them.
if (link->scoring_flagged) return;
link->last_packet = now_;
if (config_.activity_log || config_.announce_throwdowns)
activity_.throwdown(peer, p.throwdown, link->latest_root ? &link->latest_root->position : nullptr, now_);
broadcast(p, true, false, p.source);
return;
}
if (p.kind == PacketKind::party) {
if (!routed_source(p, link->member, peer, true, id_) || !link->party_budget.accept(now_, 20)) return;
link->last_packet = now_;
party_request(*link, p.party_action, p.party_player);
return;
}
if (p.kind == PacketKind::admin) {
if (!routed_source(p, link->member, peer, true, id_) || !link->admin_budget.accept(now_, 30)) return;
link->last_packet = now_;
std::string answer;
if (!is_admin(peer)) answer = "You are not an admin on this server.";
else {
log_("[admin] " + guest_name(*link) + ": " + loggable(p.text));
answer = command(p.text, peer);
}
if (auto *still = find(peer)) {
auto reply = packet(PacketKind::admin, now_);
reply.text = clean_chat_text(answer.empty() ? std::string("Done.") : answer);
if (reply.text.empty()) reply.text = "Done.";
send_packet(*still, reply, true, false);
}
return;
}
if (!link->world_ready) return;
if (!routed_source(p, link->member, peer, true, id_)) return;
if (p.kind == PacketKind::away) return drop(peer, "A player ended their session.");
if (p.kind == PacketKind::objects) {
if (link->objects.receive(p.objects) == ObjectState::Result::invalid)
return drop(peer, "Invalid shared object revision or layout.");
link->last_packet = now_;
return;
}
if (p.kind == PacketKind::voice) {
if (!voice_policy_.accepts(p.voice)) return;
if (link->received_voice && !newer_sequence(p.sequence, link->voice_sequence)) return;
if (!link->voice_budget.accept(now_, p.voice.bytes.size())) return;
link->received_voice = true;
link->voice_sequence = p.sequence;
link->last_packet = now_;
broadcast(p, false, true, p.source);
return;
}
if (accept_data(*link, p))
broadcast(p, p.kind == PacketKind::audio && std::any_of(p.audio.begin(), p.audio.end(),
[](const auto &sample) { return sample.event; }),
true, p.source);
}
void Host::receive_cosmetics() {
for (auto &[id, guest] : guests_) {
auto &link = *guest;
auto pending = std::exchange(link.pending_cosmetics, {});
for (auto &item : pending) {
const auto &p = item.packet;
if (p.world != world_ || now_ - item.received > 10000000) continue;
// Lanes may deliver an outfit before the hello or readiness; keep it until then.
if (!link.handshaken || !link.world_ready) {
link.pending_cosmetics.push_back(std::move(item));
continue;
}
if (p.map == map_ && routed_source(p, link.member, id, true, id_) && accept_data(link, p))
broadcast(p, true, false, p.source);
}
}
}
// ---- Objects ---------------------------------------------------------------------------------
void Host::sync_objects() {
if (now_ < next_object_update_) return;
next_object_update_ = now_ + 100000;
// Guests upload their layouts; the server alone decides what everyone else
// sees, and freezes the layouts of players who may not build right now.
for (auto &[id, guest] : guests_)
if (guest->handshaken && guest->objects.revision() != guest->shared_from &&
(config_.object_placement == ObjectPlacement::everyone ||
(config_.object_placement == ObjectPlacement::host_only && is_admin(id)))) {
auto layout = guest->objects.layout();
std::erase_if(layout, [&](const auto &object) { return guest->cleared.contains(object.id); });
if (config_.activity_log) activity_.objects(id, guest->shared.layout(), layout);
guest->shared.replace(layout);
guest->shared_from = guest->objects.revision();
}
struct Source { std::uint64_t id, epoch; const ObjectState *state; };
std::vector<Source> sources;
for (const auto &[id, guest] : guests_)
if (guest->handshaken && guest->world_ready) sources.push_back({id, guest->member.epoch, &guest->shared});
for (auto &[id, guest] : guests_) {
auto &peer = *guest;
if (!peer.handshaken || !peer.world_ready || sources.empty()) continue;
auto &delivery = peer.object_delivery;
const auto find_source = [&](std::uint64_t source, std::uint64_t epoch) {
return std::find_if(sources.begin(), sources.end(), [&](const auto &s) { return s.id == source && s.epoch == epoch; });
};
std::erase_if(delivery.sent, [&](const auto &row) { return find_source(row.first, row.second.first) == sources.end(); });
if (!delivery.chunks.empty() && find_source(delivery.source, delivery.epoch) == sources.end()) delivery.chunks.clear();
for (unsigned budget = 0; budget < 4; ++budget) {
if (delivery.chunks.empty()) {
for (std::size_t attempt = 0; attempt < sources.size(); ++attempt) {
const auto &source = sources[delivery.cursor++ % sources.size()];
if (source.id == id || !source.state->revision()) continue;
const auto previous = delivery.sent.find(source.id);
const auto since = previous != delivery.sent.end() && previous->second.first == source.epoch
? previous->second.second : 0;
delivery.chunks = source.state->updates(since);
if (delivery.chunks.empty()) continue;
delivery.source = source.id;
delivery.epoch = source.epoch;
delivery.next = 0;
break;
}
if (delivery.chunks.empty()) break;
}
auto update = packet(PacketKind::objects, now_);
update.source = delivery.source;
update.epoch = delivery.epoch;
update.objects = delivery.chunks[delivery.next];
if (!send_packet(peer, update, true, false)) {
transport_.disconnect(id, "Cannot deliver shared object state. Join again.");
break;
}
if (++delivery.next == delivery.chunks.size()) {
delivery.sent[delivery.source] = {delivery.epoch, update.objects.revision};
delivery.chunks.clear();
}
}
}
}
// ---- Tick ------------------------------------------------------------------------------------
void Host::tick(std::uint64_t now) {
if (!running_) return;
now_ = now;
transport_.poll();
const auto links = transport_.status().peers;
const auto linked = [&](std::uint64_t id) {
return std::any_of(links.begin(), links.end(), [id](const auto &v) { return v.id == id; });
};
for (auto it = guests_.begin(); it != guests_.end();) {
const auto id = (it++)->first;
if (!linked(id)) drop(id, "Disconnected.");
}
for (const auto &link : links) {
if (kicked_.contains(link.id)) {
transport_.disconnect(link.id, "You were kicked from this server.");
continue;
}
if (is_banned(link.id)) {
transport_.disconnect(link.id, "You are banned from this server.");
continue;
}
// The backend's list (global_bans.h), which can reach a player who is already on.
if (config_.global_bans && multiplayer::reskate_banned(link.id)) {
transport_.disconnect(link.id, multiplayer::banned_notice.data());
continue;
}
auto *guest = find(link.id);
if (!guest && join_backoff_.waiting(link.id, now_)) {
transport_.disconnect(link.id, "Too many failed attempts to join. Wait a little and try again.");
continue;
}
if (!guest) {
if (!individual_steam_id(link.id) || guests_.size() >= config_.max_players) {
transport_.disconnect(link.id, "The server is full.");
continue;
}
auto created = std::make_unique<Guest>();
created->member.id = link.id;
created->last_packet = now_;
guest = created.get();
guests_.emplace(link.id, std::move(created));
}
if (link.connected && !guest->connected_at) guest->connected_at = now_;
}
for (const auto &message : transport_.receive()) receive(message.peer, message.bytes, message.arrived);
receive_cosmetics();
for (auto it = guests_.begin(); it != guests_.end();) {
auto &g = *(it++)->second;
// Authorized arrivals get time for loading; this deadline is absolute, so
// requests cannot hold an unused slot indefinitely.
const std::uint64_t handshake_timeout = g.map_authorized ? 180000000 : 8000000;
if (g.handshaken && g.travel_since) {
if (now_ - g.travel_since > 180000000) drop(g.member.id, "Could not finish loading the new map.");
continue;
}
if ((!g.handshaken && g.connected_at && now_ - g.connected_at > handshake_timeout) ||
(g.handshaken && now_ - g.last_packet > 10000000))
drop(g.member.id, "Timed out waiting for gameplay data.");
}
tick_parties();
if (roster_dirty_ || now_ - last_roster_ > 2000000) send_roster();
for (auto &[id, guest] : guests_)
if (guest->handshaken) {
if (is_admin(id) && guest->bans_sent != bans_revision_) send_bans(*guest);
// Admins pick maps from it; with map votes on, everyone completes /vote map from it.
if (!guest->maps_sent && (is_admin(id) || config_.votes.map.enabled)) send_maps(*guest);
}
const bool loading = std::any_of(guests_.begin(), guests_.end(),
[](const auto &g) { return g.second->handshaken && !g.second->world_ready; });
if (world_ > 1 && (loading || !last_world_state_) && (!last_world_state_ || now_ - last_world_state_ >= 1000000))
send_world_state();
if (travel_started_ && !loading) {
travel_started_ = 0;
log_("Everyone has loaded " + map_name() + ".");
}
sync_objects();
activity_.tick(now_);
if (std::exchange(vote_recount_, false)) check_vote(false);
if (vote_ && now_ >= vote_->ends) check_vote(true);
tick_rotation();
std::erase_if(vote_cooldowns_, [&](const auto &entry) { return now_ >= entry.second; });
join_backoff_.prune(now_);
}
// ---- Commands --------------------------------------------------------------------------------
std::string Host::command(std::string_view line, std::uint64_t admin) {
const bool console = admin == 0;
auto [action, argument] = split(line);
const auto verb = lower(action);
// The in-game menu's names for the same settings.
const std::string name = verb == "voice-allow" ? "voice" : verb == "object-placement" ? "placement"
: verb == "world-layer-sync" ? "layer-sync" : verb == "noclip-allow" ? "noclip"
: verb == "nobail-allow" ? "nobail" : verb == "boosts-allow" ? "boosts"
: verb == "tuning-enforce" ? "tuning" : verb;
const auto target = [&](std::string_view text) -> Guest * {
// A SteamID64 (optionally followed by the player's session epoch, as the
// in-game menu sends it), or the start of a connected player's name.
// Every name starts with "", so a bare `kick` would pick the only player.
if (text.empty()) return nullptr;
const auto [first, rest] = split(text);
(void)rest;
if (const auto id = number(first)) return find(*id);
Guest *match{};
for (auto &[id, guest] : guests_)
if (guest->handshaken && lower(guest->member.name).starts_with(lower(text))) {
if (match) return nullptr;
match = guest.get();
}
return match;
};
const auto changed = [&](std::string text) {
++bans_revision_; // cheap: admins only get a fresh list when it moved
save();
roster_dirty_ = true;
if (!console) log_(text); // the console logs its own replies
return text;
};
if (name.empty() || name == "help") return std::string(help_text);
if (name == "status")
return config_.name + " | " + map_name() + " | " + std::to_string(players()) + "/" +
std::to_string(config_.max_players) + " players | " + std::to_string(config_.tps) + " TPS | voice " +
(voice_policy_.allowed ? "on" : "off") + " (" + std::to_string(static_cast<int>(config_.voice_range)) +
" m) | password " + (password_ ? "on" : "off") + " | code " + invite();
if (name == "players") {
std::string text = std::to_string(players()) + " players";
for (const auto &[id, guest] : guests_)
if (guest->handshaken)
text += "\n " + std::to_string(id) + " " + guest_name(*guest) + (is_admin(id) ? " (admin)" : "");
return text;
}
if (name == "say") {
if (!console) return "Use chat to talk to everyone.";
if (argument.empty()) return "say <text>";
send_chat(argument);
return "[chat] Server: " + clean_chat_text(argument);
}
if (name == "msg" || name == "msg-party" || name == "msg-admins") {
// Direct messages from the console or an admin, marked "[DM from ...]" so nobody takes them for chat.
const auto *sender = console ? nullptr : find(admin);
const std::string from = sender ? guest_name(*sender) : "Server";
const bool to_admins = name == "msg-admins";
const auto [who, text] = to_admins ? std::pair<std::string_view, std::string_view>{{}, trim(argument)} : split(argument);
if (text.empty()) return to_admins ? "msg-admins <text>" : name + " <player> <text>";
std::vector<Guest *> recipients;
std::string scope, label;
if (to_admins) {
scope = label = "admins";
for (auto &[id, guest] : guests_)
if (guest->handshaken && is_admin(id)) recipients.push_back(guest.get());
} else {
auto *guest = match_player(who);
if (!guest) return "No single connected player matches \"" + std::string(who) + "\".";
label = guest_name(*guest);
if (name == "msg") {
recipients.push_back(guest);
} else {
const auto *details = parties_.party(parties_.party_of(guest->member.id));
if (!details) return label + " is not in a party.";
scope = "party";
label += "'s party";
for (const auto member : details->members)
if (auto *found = find(member); found && found->handshaken) recipients.push_back(found);
}
}
if (recipients.empty()) return "No admins are online.";
const auto message = dm_line(from, scope, text, multiplayer_chat_max_bytes);
for (auto *guest : recipients) send_chat(message, guest);
const auto done = "Sent to " + label + (recipients.size() > 1 || to_admins ? " (" + std::to_string(recipients.size()) + " players)" : "") + ".";
if (!console) log_("[dm] " + from + " -> " + label + ": " + clean_chat_text(text));
return done;
}
if (name == "kick") {
auto *guest = target(argument);
if (!guest || !guest->handshaken) return "No single connected player matches \"" + std::string(argument) + "\".";
// Admins answer to the console, not to each other.
if (!console && is_admin(guest->member.id)) return "Admins cannot kick other admins.";
const auto label = guest_name(*guest);
kicked_.insert(guest->member.id);
drop(guest->member.id, "You were kicked from this server.");
return changed(label + " was kicked until the server restarts.");
}
if (name == "ban") {
auto [who, reason] = split(argument);
auto *guest = target(who);
std::uint64_t id = guest ? guest->member.id : number(who).value_or(0);
if (!individual_steam_id(id)) return "Enter a connected player or a SteamID64 (17 digits starting 7656119).";
if (id == admin) return "You cannot ban yourself.";
if (!console && is_admin(id)) return "Admins cannot ban other admins.";
if (is_banned(id)) return std::to_string(id) + " is already banned.";
auto label = guest ? guest->member.name : clean_chat_text(reason);
cut_text(label, 64);
config_.bans.push_back({id, label, static_cast<std::int64_t>(std::time(nullptr))});
if (guest) drop(id, "You were banned from this server.");
return changed((label.empty() ? std::to_string(id) : label) + " was banned.");
}
if (name == "unban") {
const auto id = number(argument).value_or(0);
const auto found = std::find_if(config_.bans.begin(), config_.bans.end(), [&](const auto &b) { return b.id == id; });
if (found == config_.bans.end()) return "That SteamID64 is not banned.";
const auto label = found->name.empty() ? std::to_string(id) : found->name;
config_.bans.erase(found);
kicked_.erase(id);
return changed(label + " was unbanned.");
}
if (name == "bans") {
std::string text = std::to_string(config_.bans.size()) + " banned";
for (const auto &ban : config_.bans) text += "\n " + std::to_string(ban.id) + " " + ban.name;
return text;
}
if (name == "map") {
// The map as it will be stored must still name a destination: one that does not would
// leave the server unable to tell players where to go, and unable to start again.
if (argument.empty() || !valid_map_destination(map_destination(argument)) ||
!valid_map_destination(map_destination(map_setting(argument))))
return "No single map is called \"" + std::string(argument) + "\". Type maps for the list.";
if (map_hash(map_destination(argument)) == map_) return "The server is already on that map.";
change_map(argument);
save();
return changed("Changing map to " + map_name());
}
if (name == "maps") {
std::string text = std::to_string(levels().size()) + " maps (custom maps come from Mods next to the server)";
for (const auto &level : levels())
text += "\n " + level.name + (same_map(level.asset) ? " (now)" : "") +
(!config_.map_pool.empty() && in_map_pool(config_, level.asset) ? " (pool)" : "");
return text;
}
if (name == "map-pool") { // map-pool [add|remove <map>|clear]
const auto [what_text, map] = split(argument);
const auto what = lower(what_text);
if (what.empty()) return pool_text();
if (what == "clear") {
config_.map_pool.clear();
resend_maps();
return changed("The map pool is cleared: players vote between every map, and the rotation goes through them all.");
}
if (what != "add" && what != "remove") return "map-pool [add|remove <map>|clear]";
const auto *level = find_level(map);
if (!level || !valid_map_destination(map_destination(level->asset)))
return "No single map is called \"" + std::string(map) + "\". Type maps for the list.";
const auto pooled = [&](const std::string &entry) { return find_level(entry) == level; };
const bool listed = std::any_of(config_.map_pool.begin(), config_.map_pool.end(), pooled);
if (what == "add") {
if (listed || config_.map_pool.empty()) return level->name + " is already in the map pool.";
config_.map_pool.push_back(level->name);
} else {
if (config_.map_pool.empty()) // every map: keep all the others
for (const auto *other : pool_levels(config_)) config_.map_pool.push_back(other->name);
else if (!listed) return level->name + " is not in the map pool.";
if (std::all_of(config_.map_pool.begin(), config_.map_pool.end(), pooled))
return "The map pool needs at least one map. map-pool clear allows every map again.";
std::erase_if(config_.map_pool, pooled);
}
resend_maps();
return changed(level->name + (what == "add" ? " added to" : " removed from") + " the map pool.");
}
if (name == "rotation") { // rotation [<minutes>|off]
if (argument.empty()) return rotation_text();
const auto value = lower(argument);
const auto minutes = value == "off" ? std::optional<std::uint64_t>(0) : number(value);
if (!minutes || *minutes > max_map_rotation) return "rotation <1-1440 minutes>|off";
config_.map_rotation = static_cast<unsigned>(*minutes);
map_since_ = now_;
rotation_warned_ = false;
resend_maps();
return changed(rotation_text());
}
if (name == "name") {
if (!valid_server_name(argument)) return std::string("Server names are ") + server_name_rule + ".";
config_.name = argument;
if (text::contains_bad_words(config_.name))
return changed("Server renamed to " + config_.name +
". That name contains blocked words, so the server stays out of the server browser.");
return changed("Server renamed to " + config_.name + ".");
}
if (name == "password") {
if (argument.size() > 64) return "Passwords are at most 64 characters.";
config_.password = argument == "off" ? std::string{} : std::string(argument);
erase_key(password_);
password_ = config_.password.empty() ? std::nullopt : password_key(config_.password, secret_);
return changed(config_.password.empty() ? "Password removed. Anyone can join."
: "Password set. Players already here stay; new ones need it.");
}
if (name == "welcome") {
if (argument != "off" && !argument.empty() && !valid_chat_text(argument)) return "The welcome message is one chat line.";
config_.welcome = argument == "off" ? std::string{} : std::string(argument);
return changed(config_.welcome.empty() ? "Welcome message removed." : "Welcome message set.");
}
if (name == "announce-throwdowns") {
const auto value = on_off(argument);
if (!value) return std::string("announce-throwdowns on|off (now ") + (config_.announce_throwdowns ? "on" : "off") + ")";
config_.announce_throwdowns = *value;
return changed(*value ? "Placed throwdowns are announced in chat." : "Placed throwdowns are no longer announced.");
}
if (name == "parties") {
const auto value = on_off(argument);
if (argument.empty()) return std::string(config_.parties ? "Parties are on.\n" : "Parties are off.\n") + party_status(0);
if (!value) return "parties on|off";
config_.parties = *value;
if (!*value) {
for (auto &[id, guest] : guests_) parties_.remove(id);
parties_.take_withdrawn();
}
return changed(*value ? "Players can form parties." : "Parties are off; every party was ended.");
}
if (name == "speed-check") {
const auto value = lower(argument);
if (value != "off" && value != "warn" && value != "kick")
return "speed-check off|warn|kick (now " + config_.speed_check + ")";
config_.speed_check = value;
if (value == "off")
for (auto &[id, guest] : guests_) {
guest->speed.restart();
guest->speeding = false;
}
return changed(value == "off" ? "Game speed is no longer checked."
: value == "kick" ? "Players whose game runs fast are kicked."
: "Players whose game runs fast are taken out of throwdowns and challenges.");
}
if (name == "score-check") {
const auto value = lower(argument);
if (value.empty()) {
std::string text = "score-check " + config_.score_check + " (off|warn|kick)";
for (const auto &[id, guest] : guests_) {
if (!guest->handshaken) continue;
text += "\n " + guest_name(*guest) + ": ";
if (!guest->scoring) text += "not reported";
else if (!*guest->scoring) text += "the game's own scoring";
else
text += scoring_text(*guest->scoring) + (guest->scoring_mods.empty() ? "" : " (" + guest->scoring_mods + ")") +
(guest->scoring_flagged ? ", out of throwdowns" : ", allowed");
}
return text;
}
if (value != "off" && value != "warn" && value != "kick") return "score-check off|warn|kick (now " + config_.score_check + ")";
config_.score_check = value;
// Kicking changes the guest list: collect first.
std::vector<std::uint64_t> ids;
for (const auto &[id, guest] : guests_) ids.push_back(id);
for (const auto id : ids)
if (auto *guest = find(id)) check_scoring(*guest);
return changed(value == "off" ? "Mods that change scoring or physics are no longer checked."
: value == "kick" ? "Players whose mods change scoring or physics are kicked."
: "Players whose mods change scoring or physics are taken out of throwdowns and challenges.");
}
if (name == "score-allow") {
auto [what, rest] = split(argument);
if (what.empty()) {
std::string text = "score-allow <fingerprint> | score-allow remove <fingerprint>. Accepted besides the game's own:";
if (config_.score_allow.empty()) text += " none";
for (const auto fingerprint : config_.score_allow) text += "\n " + scoring_text(fingerprint);
return text;
}
const bool remove = lower(what) == "remove";
const auto fingerprint = parse_scoring(remove ? rest : what);
if (!fingerprint) return "A fingerprint is 16 hex digits, as score-check lists it.";
const auto found = std::find(config_.score_allow.begin(), config_.score_allow.end(), *fingerprint);
if (remove) {
if (found == config_.score_allow.end()) return scoring_text(*fingerprint) + " was not accepted.";
config_.score_allow.erase(found);
} else if (found == config_.score_allow.end()) {
config_.score_allow.push_back(*fingerprint);
}
std::vector<std::uint64_t> ids;
for (const auto &[id, guest] : guests_) ids.push_back(id);
for (const auto id : ids)
if (auto *guest = find(id)) check_scoring(*guest);
return changed(remove ? "Scoring " + scoring_text(*fingerprint) + " is no longer accepted."
: "Scoring " + scoring_text(*fingerprint) + " is accepted like the game's own.");
}
if (name == "party-size") {
const auto value = number(argument);
if (!value || *value < 2 || *value > 8) return "party-size <2-8> (now " + std::to_string(config_.party_size) + ")";
config_.party_size = static_cast<unsigned>(*value);
parties_.set_limit(config_.party_size);
return changed("Parties hold up to " + std::to_string(config_.party_size) + " players. Larger ones stay until members leave.");
}
if (name == "activity-log") {
const auto value = on_off(argument);
if (!value) return std::string("activity-log on|off (now ") + (config_.activity_log ? "on" : "off") + ")";
config_.activity_log = *value;
if (!*value) activity_.clear();
return changed(*value ? "Player activity (throwdowns, objects, loading) is logged."
: "Player activity is no longer logged.");
}
if (name == "listed") {
const auto value = on_off(argument);
if (!value) return "listed on|off";
config_.listed = *value;
return changed(*value ? "The server is listed in the server browser." : "The server is hidden; players need the code.");
}
if (name == "tps") {
const auto value = number(argument);
if (!value || !valid_multiplayer_tps(static_cast<unsigned>(*value))) return "tps 20|30|60|120";
config_.tps = static_cast<unsigned>(*value);
for (auto &[id, guest] : guests_) guest->pose_delivery = {};
return changed("Network updates set to " + std::to_string(config_.tps) + " TPS.");
}
if (name == "voice") {
const auto value = on_off(argument);
if (!value) return "voice on|off";
config_.voice_chat = *value;
if (voice_policy_.allowed != *value) {
voice_policy_.allowed = *value;
if (!++voice_policy_.revision) ++voice_policy_.revision;
}
return changed(*value ? "Voice chat allowed." : "Voice chat disabled for everyone.");
}
if (name == "voice-range") {
float range{};
const auto result = std::from_chars(argument.data(), argument.data() + argument.size(), range);
if (result.ec != std::errc{} || result.ptr != argument.data() + argument.size() || !valid_voice_range(range))
return "Choose a voice range from 50 to 1000 m.";
config_.voice_range = range;
return changed("Voice range set to " + std::to_string(static_cast<int>(range)) + " m.");
}
if (name == "distances") {
MultiplayerDistances value;
auto rest = argument;
for (auto *field : {&value.full_rate_return, &value.half_rate_start, &value.half_rate_return, &value.low_rate_start}) {
const auto [token, remaining] = split(rest);
const auto result = std::from_chars(token.data(), token.data() + token.size(), *field);
if (token.empty() || result.ec != std::errc{} || result.ptr != token.data() + token.size())
return "distances <full> <half> <half-return> <low> (whole metres)";
rest = remaining;
}
if (!rest.empty() || !value.valid())
return "Use ordered distances: full < half <= half-return < low (at most 10000 m).";
config_.distances = value;
for (auto &[id, guest] : guests_) guest->pose_delivery = {};
return changed("TPS distances updated.");
}
if (name == "placement") {
// The protocol's "host only" is admins only here: the server has no skater of its own.
const auto policy = parse_object_placement(argument == "admins" ? "host" : argument, config_.object_placement);
if (!policy) return "placement everyone|admins|nobody";
config_.object_placement = *policy;
return changed(*policy == ObjectPlacement::everyone ? "Everyone can place objects."
: *policy == ObjectPlacement::host_only ? "Only admins can place objects. Everyone else's are frozen."
: "Object placement is off. Existing objects stay.");
}
if (name == "votes") {
// votes | votes <map|kick|tod> on|off|<percent> | votes seconds|cooldown <n>
const auto [what_text, value_text] = split(argument);
const auto what = lower(what_text);
const auto describe = [&](const char *label, const VoteSetting &v) {
return std::string(label) + ": " + (v.enabled ? "on, " + std::to_string(v.percent) + "% to pass" : "off");
};
if (what.empty())
return describe("map votes", config_.votes.map) + "\n" + describe("kick votes", config_.votes.kick) + "\n" +
describe("time of day votes", config_.votes.time) +
(config_.world_layer_sync ? "" : " (needs layer-sync on)") + "\nvotes last " +
std::to_string(config_.votes.seconds) + " s; a player waits " + std::to_string(config_.votes.cooldown) +
" s between votes" + (vote_ ? "\nrunning: a vote to " + vote_->label : std::string{});
const auto value = lower(value_text);
if (what == "seconds" || what == "cooldown") {
const auto n = number(value);
const bool seconds = what == "seconds";
if (!n || (seconds ? *n < 10 || *n > 300 : *n > 3600))
return seconds ? "votes seconds <10-300>" : "votes cooldown <0-3600>";
(seconds ? config_.votes.seconds : config_.votes.cooldown) = static_cast<unsigned>(*n);
return changed(seconds ? "Votes now last " + std::to_string(*n) + " s."
: "Players now wait " + std::to_string(*n) + " s between votes.");
}
VoteSetting *setting = what == "map" ? &config_.votes.map : what == "kick" ? &config_.votes.kick
: what == "tod" || what == "time" ? &config_.votes.time : nullptr;
if (!setting) return "votes [map|kick|tod on|off|<percent>] | votes seconds <n> | votes cooldown <n>";
const auto label = what == "map" ? std::string("Map votes") : what == "kick" ? std::string("Kick votes")
: std::string("Time of day votes");
if (const auto toggle = on_off(value)) {
setting->enabled = *toggle;
if (!*toggle && vote_ && vote_setting(vote_->kind).enabled == false) cancel_vote("that vote was switched off");
return changed(label + (*toggle ? " are on (" + std::to_string(setting->percent) + "% to pass)." : " are off."));
}
const auto percent = number(value.ends_with("%") ? std::string_view(value).substr(0, value.size() - 1) : std::string_view(value));
if (!percent || *percent < 1 || *percent > 100) return "votes " + what + " on|off|<1-100>";
setting->percent = static_cast<unsigned>(*percent);
return changed(label + " now need " + std::to_string(*percent) + "% to pass.");
}
if (name == "vote-cancel") {
if (!vote_) return "No vote is running.";
cancel_vote(console ? "the server cancelled it" : "an admin cancelled it");
return "Vote cancelled.";
}
if (name == "tpall" || name == "tphere") {
// Where they go: the admin who asked, or (tpall from the console) the named player.
Guest *to{};
std::vector<Guest *> movers;
if (name == "tpall") {
to = argument.empty() ? (console ? nullptr : find(admin)) : target(argument);
if (!to || !to->handshaken)
return console && argument.empty() ? "tpall <player>: everyone goes to that player."
: "No single connected player matches \"" + std::string(argument) + "\".";
for (auto &[id, guest] : guests_)
if (guest->handshaken && guest->world_ready && guest.get() != to) movers.push_back(guest.get());
} else {
if (console) return "tphere is for admins in the game; the console can use tpall <player>.";
to = find(admin);
auto *who = target(argument);
if (!who || !who->handshaken) return "No single connected player matches \"" + std::string(argument) + "\".";
if (who == to) return "That is you.";
movers.push_back(who);
}
if (!to || !to->latest_root) return "There is no position for " + (to ? guest_name(*to) : std::string("you")) + " yet.";
if (movers.empty()) return "Nobody else is in the world.";
const auto at = to->latest_root->position;
unsigned sent{};
for (std::size_t i = 0; i < movers.size(); ++i) {
// A ring around them, so nobody lands inside anyone else.
const float angle = 6.2831853f * static_cast<float>(i) / static_cast<float>(movers.size());
auto p = packet(PacketKind::teleport, now_);
p.teleport = {at[0] + 2.5f * std::cos(angle), at[1] + 1.0f, at[2] + 2.5f * std::sin(angle)};
if (send_packet(*movers[i], p, true, false)) ++sent;
}
const auto text = movers.size() == 1 && sent ? guest_name(*movers[0]) + " was teleported to " + guest_name(*to) + "."
: std::to_string(sent) + " player(s) teleported to " + guest_name(*to) + ".";
if (!console) log_(text);
return text;
}
if (name == "noclip" || name == "nobail" || name == "boosts") {
auto &allowed = name == "noclip" ? config_.noclip : name == "nobail" ? config_.no_bail : config_.boosts;
const auto value = argument == "toggle" ? std::optional<bool>(!allowed) : on_off(argument);
if (!value) return name + " on|off (now " + (allowed ? "on" : "off") + ")";
allowed = *value;
const std::string tool = name == "noclip" ? "Noclip and teleporting" : name == "nobail" ? "No Bail" : "Boosts";
return changed(tool + (*value ? (name == "boosts" ? " are" : " is") + std::string(" allowed for everyone.")
: (name == "boosts" ? " are" : " is") + std::string(" off for players; admins keep it.")));
}
if (name == "tuning") {
const auto value = argument == "toggle" ? std::optional<bool>(!config_.enforce_tuning) : on_off(argument);
if (!value) return std::string("tuning on|off (now ") + (config_.enforce_tuning ? "on" : "off") + ")";
config_.enforce_tuning = *value;
return changed(*value ? "Players skate with the game's own physics tuning."
: "Players skate with their own physics tuning.");
}
if (name == "clear-objects") {
std::size_t removed{};
for (auto &[id, guest] : guests_) {
if (!guest->handshaken) continue;
for (const auto *state : {&guest->objects, &guest->shared})
for (const auto &[object, value] : state->objects()) {
(void)value;
guest->cleared.insert(object);
}
removed += guest->shared.objects().size();
if (guest->shared.revision()) guest->shared.replace({});
guest->shared_from = guest->objects.revision();
}
++object_clears_;
return changed("Deleted " + std::to_string(removed) + " placed object" + (removed == 1 ? "." : "s."));
}
if (name == "park") {
if (lower(argument) == "random") {
config_.parks = random_park_choices();
return changed("Random layouts selected for every park slot.");
}
const auto [lot_name, layout] = split(argument);
const auto lot = std::find_if(park_lots.begin(), park_lots.end(), [&](const auto &l) { return l.key == lot_name; });
if (lot == park_lots.end()) return "park construction|historic|financial <layout, e.g. skatepark_01, or empty>";
const auto index = static_cast<unsigned>(lot - park_lots.begin());
if (layout.empty() || !valid_park(index, layout)) return "That is not a layout for this lot.";
config_.parks[index] = layout;
return changed(std::string(lot->label) + " now shows " + park_label(layout) + ".");
}
if ((name == "layer-sync" || name == "layer" || name == "layers" || name == "tod") && world_layers().empty())
return "World layers need world-layers.json next to the server (copy it from a player's "
"%LOCALAPPDATA%\\ReSkate\\cache folder for the same game build).";
if (name == "layer-sync") {
const auto value = on_off(argument);
if (!value) return "layer-sync on|off";
config_.world_layer_sync = *value;
apply_layers();
return changed(*value ? "Everyone now follows the server's world layers." : "Players choose their own world layers.");
}
if (name == "layers") {
// Several at once, as key=mode pairs: the in-game time of day sends seven.
std::vector<std::pair<std::string, std::string>> changes;
for (auto rest = argument; !rest.empty();) {
const auto [pair, remaining] = split(rest);
rest = remaining;
const auto equals = pair.find('=');
if (equals == std::string_view::npos) return "layers <key>=default|on|off ...";
const auto key = pair.substr(0, equals), mode = pair.substr(equals + 1);
if (std::none_of(world_layers().begin(), world_layers().end(), [&](const auto &l) { return l.key == key; }))
return "No world layer is called \"" + std::string(key) + "\".";
if (!valid_world_layer_mode(mode)) return "layers <key>=default|on|off ...";
changes.emplace_back(key, mode);
}
if (changes.empty()) return "layers <key>=default|on|off ...";
for (const auto &[key, mode] : changes) {
if (mode == "default") config_.layers.erase(key);
else config_.layers[key] = mode;
}
apply_layers();
return changed(std::to_string(changes.size()) + " world layer" + (changes.size() == 1 ? "" : "s") + " changed" +
(config_.world_layer_sync ? "." : ". Turn on layer-sync to apply them to everyone."));
}
if (name == "tod") {
// Every map's seven time layers ("<map>_tod_<n>_<name>"): one on and the rest off, or
// all back to the level's own. Set for every map, so it holds across map changes.
static constexpr std::array<std::string_view, 8> times{"default", "morning", "noon", "afternoon",
"evening", "night", "weatherday", "weathernight"};
const auto wanted = lower(argument);
const auto found = std::find(times.begin(), times.end(), wanted);
if (found == times.end()) return "tod default|morning|noon|afternoon|evening|night|weatherday|weathernight";
const auto slot = static_cast<char>('0' + (found - times.begin()));
unsigned count{};
for (const auto &layer : world_layers()) {
const auto at = layer.key.find("_tod_");
if (at == std::string::npos || at + 5 >= layer.key.size()) continue;
if (slot == '0') config_.layers.erase(layer.key);
else config_.layers[layer.key] = layer.key[at + 5] == slot ? "on" : "off";
++count;
}
if (!count) return "world-layers.json has no time-of-day layers.";
apply_layers();
return changed("Time of day set to " + std::string(*found) +
(config_.world_layer_sync ? " for everyone." : ". Turn on layer-sync to apply it to everyone."));
}
if (name == "layer") {
const auto [key, mode] = split(argument);
const auto found = std::find_if(world_layers().begin(), world_layers().end(), [&](const auto &l) { return l.key == key; });
if (found == world_layers().end()) return "No world layer is called \"" + std::string(key) + "\".";
if (!valid_world_layer_mode(mode)) return "layer <key> default|on|off";
if (mode == "default") config_.layers.erase(std::string(key));
else config_.layers[std::string(key)] = mode;
apply_layers();
return changed(found->label + " set to " + std::string(mode) +
(config_.world_layer_sync ? "." : ". Turn on layer-sync to apply it to everyone."));
}
if (name == "admins" || name == "admin") {
if (!console) return "Only the server console manages admins.";
const auto [sub, who] = split(argument);
if (name == "admins" || sub.empty()) {
std::string text = std::to_string(config_.admins.size()) + " admins";
for (const auto id : config_.admins) {
const auto *guest = find(id);
text += "\n " + std::to_string(id) + (guest ? " " + guest_name(*guest) : std::string{});
}
return text;
}
auto *guest = target(who);
const auto id = guest ? guest->member.id : number(who).value_or(0);
if (!individual_steam_id(id)) return "admin add|remove <player or SteamID64>";
if (sub == "add") {
if (!is_admin(id)) config_.admins.push_back(id);
resend_maps();
return changed(std::to_string(id) + " is an admin.");
}
if (sub == "remove") {
std::erase(config_.admins, id);
resend_maps();
return changed(std::to_string(id) + " is no longer an admin.");
}
return "admin add|remove <player or SteamID64>";
}
return "Unknown command \"" + std::string(action) + "\". Type help.";
}
// A player's mods change how tricks score (their report; Engine/Vfs/mod_scoring.h): flagged
// players are taken out of linked throwdowns and coop challenges (the roster's scoring flag, and
// the server relays none of theirs), or kicked. The game keeps a scoring mod's points until it
// restarts, so the flag lasts for the session.
void Host::check_scoring(Guest &guest) {
if (!guest.handshaken) return;
const bool changed = guest.scoring && *guest.scoring &&
std::find(config_.score_allow.begin(), config_.score_allow.end(), *guest.scoring) == config_.score_allow.end();
const auto name = guest_name(guest);
if (config_.score_check == "off" || !changed) {
if (!guest.scoring_flagged) return;
guest.scoring_flagged = false;
roster_dirty_ = true;
log_("[anticheat] " + name + " may take part in throwdowns again (score-check " + config_.score_check + ").");
return;
}
if (guest.scoring_flagged) return;
const auto mods = guest.scoring_mods.empty() ? std::string("their mods") : guest.scoring_mods;
log_("[anticheat] " + name + "'s mods change scoring or physics: " + mods + " (scoring " + scoring_text(*guest.scoring) + ").");
if (config_.score_check == "kick")
return drop(guest.member.id, "Your mods change scoring or physics (" + mods + "). Turn them off and restart Skate to play here.");
// Every player's game says so in chat when the roster flags someone, the player themself included.
guest.scoring_flagged = true;
roster_dirty_ = true;
}
// A speedhack runs the player's game clock, and so their pose timestamps, faster than real
// time. Flagged players are taken out of linked throwdowns and coop challenges (the roster's
// speeding flag: every client drops them from those), or kicked; the flag clears after a minute
// of normal speed.
bool Host::check_speed(Guest &guest, std::uint64_t sent) {
if (config_.speed_check == "off" || !guest.handshaken || !guest.world_ready || !sent) return true;
if (!guest.speed.sample(sent, now_)) return true;
const auto name = guest_name(guest);
const auto speed = guest.speed.speed();
if (guest.speed.flagged() && !guest.speeding) {
char text[160];
std::snprintf(text, sizeof text, "%s's game is running at %.2fx speed (a speed hack?).", name.c_str(), speed);
log_(std::string("[anticheat] ") + text);
if (config_.speed_check == "kick") {
drop(guest.member.id, "Your game is running faster than normal. Turn off speed hacks to play here.");
return false;
}
guest.speeding = true;
guest.speed_normal_since = 0;
roster_dirty_ = true;
send_chat("The server measured your game running faster than normal: throwdowns and challenges are off for you until it's back to normal speed.", &guest);
for (auto &[id, other] : guests_)
if (other->handshaken && is_admin(id) && other.get() != &guest)
send_chat(std::string(text) + " They were taken out of throwdowns and challenges.", other.get());
return true;
}
if (!guest.speeding) return true;
if (speed < SpeedCheck::limit) {
if (!guest.speed_normal_since) guest.speed_normal_since = now_;
if (now_ - guest.speed_normal_since >= 60000000) {
guest.speeding = false;
roster_dirty_ = true;
log_("[anticheat] " + name + "'s game speed is back to normal.");
send_chat("Your game speed is back to normal: throwdowns and challenges are on again.", &guest);
}
} else guest.speed_normal_since = 0;
return true;
}
} // namespace dingosdk::server
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