#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 #include #else #include #include #endif #include #include #include #include #include #include namespace dingosdk::server { namespace { std::uint64_t nonce() { std::uint64_t value{}; #ifdef _WIN32 if (BCryptGenRandom(nullptr, reinterpret_cast(&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(&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(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 | msg | msg-party | msg-admins | kick | ban [name] | unban | bans\n" "map | maps | name | password | welcome | listed on|off\n" "tps 20|30|60|120 | voice on|off | voice-range <50-1000> | distances \n" "placement everyone|admins|nobody | objects |off | clear-objects | noclip on|off | nobail on|off | boosts on|off | tuning on|off\n" "tpall [player] | tphere | votes [map|kick|tod on|off|] | vote-cancel\n" "map-pool [add|remove |clear] | rotation [|off]\n" "park | park random | layer-sync on|off | layer default|on|off | tod \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 [|remove ]\n" "admin add|remove | 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(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 raw, std::span 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 &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 raw, wire; }; std::array 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.object_limit = config_.object_limit; 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(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(at - list.maps.begin())); } } else { for (const auto *level : pool_levels(config_)) add(*level); } list.map_rotation = static_cast(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 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); }); // No more of a player's objects than the server allows each of them; admins are not limited. if (!is_admin(id)) layout = limited_layout(std::move(layout), guest->shared.objects(), config_.object_limit); 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 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(); 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 == "object-limit" ? "objects" : 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(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 "; 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{{}, trim(argument)} : split(argument); if (text.empty()) return to_admins ? "msg-admins " : name + " "; std::vector 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::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 |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 |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 [|off] if (argument.empty()) return rotation_text(); const auto value = lower(argument); const auto minutes = value == "off" ? std::optional(0) : number(value); if (!minutes || *minutes > max_map_rotation) return "rotation <1-1440 minutes>|off"; config_.map_rotation = static_cast(*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 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 | score-allow remove . 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 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(*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(*value))) return "tps 20|30|60|120"; config_.tps = static_cast(*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(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 (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 == "objects") { const auto limit = parse_object_limit(argument); if (!limit) return "objects <1-" + std::to_string(max_object_limit) + ">|off"; config_.object_limit = *limit; for (auto &[id, guest] : guests_) guest->shared_from = 0; // look at every layout again return changed(*limit ? "Each player can place up to " + std::to_string(*limit) + " objects. Admins are not limited." : std::string("Players can place as many objects as they like.")); } if (name == "votes") { // votes | votes on|off| | votes seconds|cooldown 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(*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|] | votes seconds | votes cooldown "; 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(*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 movers; if (name == "tpall") { to = argument.empty() ? (console ? nullptr : find(admin)) : target(argument); if (!to || !to->handshaken) return console && argument.empty() ? "tpall : 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 ."; 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(i) / static_cast(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(!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(!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 "; const auto index = static_cast(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> 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 =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 =default|on|off ..."; changes.emplace_back(key, mode); } if (changes.empty()) return "layers =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 ("_tod__"): 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 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('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 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 "; 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 "; } 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