mirror of
https://github.com/Dingo-Shenanigans/ReSkate.git
synced 2026-10-17 15:07:06 +02:00
AyeZeeBB
07fef3820d
Limit how many objects each player can place (protocol 43) - Servers and lobby hosts set how many objects each player may have placed: object_limit in ReSkateServer.json and the "objects" command, "Objects per player" in the host options. Default 100; 0 is no limit - The host and a server's admins are not limited - At the limit a player's game refuses another object, from the native object tool and the park editor, and the menu shows how many they have placed - Enforced by the host or server, which shows everyone no more than the limit of each player's layout; objects already shown keep their place - The limit travels in the roster, which takes the protocol to version 43: builds before this cannot join sessions with builds after it - The protocol tests link again (the server browser needs the identity lists since the official servers change)
950 lines
48 KiB
C++
950 lines
48 KiB
C++
#include "session_internal.h"
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#include "Extension/Profile/local_profile_runtime.h"
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#include "Extension/Multiplayer/Net/wire_codec.h"
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#include "Engine/Game/Build/supported_build.h"
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#include <algorithm>
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#include <iterator>
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#include <stdexcept>
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#include <utility>
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namespace dingosdk::multiplayer {
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using namespace session_detail;
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namespace {
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Peer &reserve(Session &s, std::uint64_t id, std::uint64_t now) {
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if (auto *p = find_peer(s, id))
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return *p;
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for (std::size_t slot = 0; slot < s.peers.size(); ++slot)
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if (auto &p = s.peers[slot]; !p.member.id) {
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p.member.id = id;
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p.last_packet = now;
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note_slot(s, slot);
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return p;
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}
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throw std::runtime_error("Session has no free player slots.");
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}
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void defer_cosmetics(Peer &link, const Packet &packet, std::uint64_t now) {
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auto &pending = link.pending_cosmetics;
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std::erase_if(pending, [&](const auto &item) { return now - item.received > 10000000; });
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const auto found = std::find_if(pending.begin(), pending.end(), [&](const auto &item) {
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return item.packet.source == packet.source && item.packet.epoch == packet.epoch;
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});
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if (found != pending.end()) {
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if (newer_sequence(packet.sequence, found->packet.sequence)) *found = {packet, now};
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} else {
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if (pending.size() >= max_players) pending.erase(pending.begin());
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pending.push_back({packet, now});
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}
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}
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void receive_cosmetics(Session &s, const NativeFrame &local, std::uint64_t now) {
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for (auto &link : active_peers(s)) {
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auto pending = std::exchange(link.pending_cosmetics, {});
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const bool direct = s.mode == Mode::join && link.member.id != s.host_id;
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for (auto &item : pending) {
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const auto &p = item.packet;
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if (p.world != s.world || now - item.received > 10000000) continue;
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auto *source = find_peer(s, p.source);
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// Lanes may deliver an outfit before welcome/roster/readiness. Keep
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// the bounded decoded value until those independent messages arrive;
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// never apply it before the normal identity/world/admission checks.
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if (!link.handshaken || !local.ready || s.awaiting_map || !s.host_world_ready ||
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!s.started_map || (s.mode == Mode::host && !link.world_ready) ||
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(direct && !link.direct_ready) || !source || !source->handshaken ||
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source->member.epoch != p.epoch) {
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link.pending_cosmetics.push_back(std::move(item));
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continue;
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}
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if (p.map == s.map &&
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routed_source(p, source->member, link.member.id, s.mode == Mode::host, s.host_id, direct) &&
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accept_data(*source, p, now) && s.mode == Mode::host)
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broadcast(s, p, true, false, now, p.source);
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}
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}
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}
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// Chat proofs. A guest takes chat from the host alone, which passes every other guest's lines
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// on, and a host can pass on what it likes under any of its players' names. That is no worse
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// than a name on a line, until the line shows a badge of the backend's (Dev, Creator, Homie):
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// then it is a line a developer never wrote, with their badge on it. So such a guest also
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// sends each line straight to the players Steam connects them to (send_chat), and here a line
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// the host passed on as theirs shows their badge only when that copy says the same. One
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// without it waits a moment for it, then shows as any other player's would: from an older
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// build, a party line (which the host writes), or not theirs at all.
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constexpr std::uint64_t chat_proof_wait = 500000, chat_proof_life = 10000000;
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constexpr std::size_t chat_proofs_kept = 8;
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// Whether a line the host passed on as this player's would show a badge that rests on who
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// they are: another guest's, known to Steam, on one of the backend's lists and showing it.
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bool owes_proof(const Session &s, const Peer &sender) {
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return s.mode == Mode::join && sender.member.id != s.host_id && steam_vouched(s, sender) && shows_tag(sender) &&
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identity_mark(sender.member.id);
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}
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std::string chat_name(Session &s, const Peer &sender) {
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return sender.member.name.empty() ? s.transport.name(sender.member.id) : sender.member.name;
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}
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// Shows the lines that have waited long enough (or all of them), without the badge.
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void release_chat(Session &s, Peer &sender, std::uint64_t now, bool all) {
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auto &waiting = sender.chat_waiting;
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auto line = waiting.begin();
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for (; line != waiting.end() && (all || now < line->at || now - line->at >= chat_proof_wait); ++line)
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add_chat(s, sender.member.id, chat_name(s, sender), std::move(line->text), false, false);
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waiting.erase(waiting.begin(), line);
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}
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// The host's copy of a line: shown at once when the sender's own copy is here, else it waits.
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void relayed_chat(Session &s, Peer &sender, const Packet &p, std::uint64_t now) {
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auto &proofs = sender.chat_proofs;
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const auto proof = std::find_if(proofs.begin(), proofs.end(), [&](const auto ©) {
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return copy.sequence == p.sequence && copy.text == p.text && now >= copy.at && now - copy.at <= chat_proof_life;
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});
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const bool proven = proof != proofs.end();
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if (proven) proofs.erase(proof);
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// The sender's copies come in the order of their lines: with this one's here, or none
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// owed for it, nothing is on its way for the lines before it.
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if (proven || p.text.starts_with("[Party] ")) {
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release_chat(s, sender, now, true);
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add_chat(s, sender.member.id, chat_name(s, sender), p.text, false, proven);
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return;
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}
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if (sender.chat_waiting.size() >= chat_proofs_kept) release_chat(s, sender, now, true);
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sender.chat_waiting.push_back({p.sequence, p.text, now});
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}
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// The sender's own copy of a line, over their own connection. Never shown by itself.
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void proven_chat(Session &s, Peer &sender, const Packet &p, std::uint64_t now) {
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if (!owes_proof(s, sender)) return;
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auto &waiting = sender.chat_waiting;
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const auto held = std::find_if(waiting.begin(), waiting.end(), [&](const auto &line) {
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return line.sequence == p.sequence && line.text == p.text;
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});
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if (held != waiting.end()) {
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for (auto line = waiting.begin(); line != held; ++line)
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add_chat(s, sender.member.id, chat_name(s, sender), std::move(line->text), false, false);
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add_chat(s, sender.member.id, chat_name(s, sender), std::move(held->text));
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waiting.erase(waiting.begin(), held + 1);
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return;
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}
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auto &proofs = sender.chat_proofs;
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std::erase_if(proofs, [&](const auto ©) { return now < copy.at || now - copy.at > chat_proof_life; });
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if (proofs.size() >= chat_proofs_kept) proofs.erase(proofs.begin());
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proofs.push_back({p.sequence, p.text, now});
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}
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// A hitch leaves a backlog of pose updates, all of which would be decoded in one frame.
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// Every pose delta references a reliable baseline, never another delta, so older deltas
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// of one stream in a batch can be dropped undecoded. Keep the newest ones playback may
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// still interpolate between (its delay plus a frame each side) among those whose baseline
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// is already here; baselines and every other kind are always read.
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std::vector<bool> stale_pose_deltas(Session &s, const std::vector<TransportMessage> &messages) {
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std::vector<bool> stale(messages.size());
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struct Stream {
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std::uint64_t link{}, source{};
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unsigned kept{}, keep{};
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};
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std::vector<Stream> streams;
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for (auto i = messages.size(); i-- > 0;) {
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const auto &bytes = messages[i].bytes;
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// Sparse pose patches (delta_codec.cpp): "RMS1"/"RMS2", source at 4, kind at 20.
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if (bytes.size() <= 34 || bytes[0] != 'R' || bytes[1] != 'M' || bytes[2] != 'S' ||
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(bytes[3] != '1' && bytes[3] != '2'))
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continue;
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std::uint64_t source{};
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for (unsigned b = 0; b < 8; ++b)
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source |= std::uint64_t{bytes[4 + b]} << (8 * b);
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if ((bytes[20] | (unsigned{bytes[21]} << 8)) != static_cast<unsigned>(PacketKind::pose))
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continue;
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// One whose baseline has not arrived (it may be in this batch) is left to decode
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// or fail as before, and does not use up the count.
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std::uint64_t epoch{};
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std::uint32_t reference{};
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for (unsigned b = 0; b < 8; ++b)
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epoch |= std::uint64_t{bytes[12 + b]} << (8 * b);
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for (unsigned b = 0; b < 4; ++b)
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reference |= std::uint32_t{bytes[22 + b]} << (8 * b);
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const auto *link = find_peer(s, messages[i].peer);
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if (!link || !link->receiver.holds(source, PacketKind::pose, epoch, reference))
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continue;
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auto stream = std::find_if(streams.begin(), streams.end(),
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[&](const auto &v) { return v.link == messages[i].peer && v.source == source; });
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if (stream == streams.end()) {
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const auto *peer = find_peer(s, source);
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const std::uint32_t interval =
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peer && peer->received_pose_interval ? peer->received_pose_interval : 50000;
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const auto delay = std::max<std::uint32_t>(100000, interval + 50000);
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streams.push_back({messages[i].peer, source, 0, std::clamp<unsigned>(delay / interval + 2, 2, 16)});
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stream = std::prev(streams.end());
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}
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if (stream->kept >= stream->keep)
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stale[i] = true;
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else
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++stream->kept;
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}
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return stale;
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}
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} // namespace
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namespace session_detail {
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void apply_roster(Session &s, const Packet &p, std::uint64_t now) {
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auto *host = find_peer(s, s.host_id);
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if (!host || !host->handshaken ||
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!trusted_roster(p, s.host_id, host->member.epoch, s.transport.status().local_id, s.epoch))
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throw std::runtime_error("Host supplied an invalid player roster.");
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if (s.roster_sequence && !newer_sequence(p.sequence, s.roster_sequence))
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return;
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s.roster_sequence = p.sequence;
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s.server_admin = false;
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for (const auto &m : p.members)
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if (m.id == s.transport.status().local_id) {
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s.server_admin = m.admin && game_server_steam_id(s.host_id);
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set_local_party(s, m);
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s.local_speeding = m.speeding && game_server_steam_id(s.host_id);
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if (m.scoring && !s.local_scoring) add_chat(s, 0, "ReSkate", own_scoring_notice());
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s.local_scoring = m.scoring;
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}
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if (s.voice_policy != p.voice_policy) s.voice.reset();
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s.voice_policy = p.voice_policy;
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if (s.tps != p.tps) {
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s.tps = p.tps;
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s.next_send = 0;
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for (auto &peer : active_peers(s)) peer.pose_delivery = {};
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}
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apply_object_placement(s, p.object_placement);
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apply_object_limit(s, p.object_limit); // after server_admin, which exempts an admin
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apply_guest_tools(s, p.guest_noclip, p.guest_no_bail, p.guest_boosts);
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s.enforce_tuning = p.enforce_tuning;
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s.server_votes = dedicated_host(s) ? p.server_votes : 0;
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publish_chat(s); // the "/" list follows the server's votes, its players and its maps
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if (s.object_clears && *s.object_clears != p.object_clears) s.clear_pending = true;
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s.object_clears = p.object_clears;
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s.force_world_layers = p.force_world_layers;
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s.layers = unpack_world_layers(p.layers);
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apply_host_world_layers(s.force_world_layers, s.layers);
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apply_distances(s, p.distances);
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apply_host_park_choices(p.parks);
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MemberSlots old{};
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for (std::size_t i = 0; i < old.size(); ++i)
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old[i] = s.peers[i].member;
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const auto next = roster_slots(old, p.members, s.transport.status().local_id);
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for (std::size_t i = 0; i < next.size(); ++i) {
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if (old[i].id != next[i].id || old[i].epoch != next[i].epoch) {
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if (old[i].id && old[i].id != s.host_id)
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s.transport.disconnect(old[i].id, "Player left or rejoined the host roster.");
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release_chat(s, s.peers[i], now, true); // what they said just before leaving
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reset_peer(s, i);
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s.peers[i].last_packet = now;
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}
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// Someone the host just flagged (or who arrives flagged) for mods that change scoring or physics.
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if (next[i].id && next[i].scoring && !(old[i].id == next[i].id && old[i].scoring)) {
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const auto name = next[i].name.empty() ? s.transport.name(next[i].id) : next[i].name;
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add_chat(s, 0, "ReSkate", name + "'s mods change scoring or physics, so they are out of throwdowns and coop challenges.");
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}
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s.peers[i].member = next[i];
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s.peers[i].handshaken = next[i].id != 0;
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if (next[i].id) note_slot(s, i);
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}
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s.capacity = p.capacity;
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s.roster_voice_range = p.voice_range;
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++s.party_revision; // anyone's party may have changed
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// A dedicated server knows players only by the name each sent in their hello.
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for (auto &peer : active_peers(s))
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if (peer.member.id && peer.member.name.empty() && individual_steam_id(peer.member.id))
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peer.member.name = s.transport.name(peer.member.id);
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s.transport.allow_peers(p.members);
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s.last_routes = 0;
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s.status = "Connected through Steam. Network updates: " + std::to_string(s.tps) + " TPS.";
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}
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bool accept_data(Peer &peer, const Packet &p, std::uint64_t now) {
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bool accepted{};
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if (p.kind == PacketKind::cosmetics) {
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accepted = peer.outfit_budget.accept(now) && peer.appearance.push(p);
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if (accepted) {
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peer.cosmetic_packet = encode_wire(p);
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++peer.cosmetic_revision;
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}
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} else if (p.kind == PacketKind::audio)
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accepted = peer.sound_budget.accept(now, p.audio.size()) && peer.audio.push(p, now);
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else if (p.kind == PacketKind::pose)
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accepted = peer.poses.push_validated(p, now);
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if (accepted) {
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peer.last_packet = now;
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if (p.kind == PacketKind::pose) {
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peer.pose_arrival = now;
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peer.latest_root = p.pose.root;
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peer.player_collision = p.player_collision;
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peer.received_pose_interval = p.pose_interval_us;
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++peer.pose_count;
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}
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}
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return accepted;
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}
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bool accept_data(Peer &peer, Packet &&p, std::uint64_t now) {
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if (p.kind != PacketKind::pose)
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return accept_data(peer, std::as_const(p), now);
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const auto root = p.pose.root;
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const auto interval = p.pose_interval_us;
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const bool collision = p.player_collision;
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if (!peer.poses.push_validated(std::move(p), now))
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return false;
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peer.player_collision = collision;
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peer.last_packet = now;
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peer.pose_arrival = now;
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peer.latest_root = root;
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peer.received_pose_interval = interval;
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++peer.pose_count;
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return true;
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}
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void networking(Session &s, const NativeFrame &local, std::uint64_t now) {
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s.network_now = now;
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s.join_backoff.prune(now);
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trim_slots(s);
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if (world_playing(s, local)) s.local_root = local.pose.root;
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for (auto &peer : active_peers(s))
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if (!peer.chat_waiting.empty()) release_chat(s, peer, now, false);
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s.transport.poll();
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if (s.mode == Mode::join && s.transport.status().telemetry) {
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const auto &t = s.transport.status();
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const auto peers = active_peers(s);
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const auto active =
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static_cast<unsigned>(std::count_if(peers.begin(), peers.end(), [&](const auto &p) {
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return p.member.id != s.host_id && p.direct_ready;
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}));
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s.direct_upload.update(now, t.queue_us, t.skipped, active);
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}
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const auto links = s.transport.status().peers;
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const auto physical = [&](std::uint64_t id) {
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return std::find_if(links.begin(), links.end(), [id](const auto &v) { return v.id == id; });
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};
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for (auto &p : active_peers(s)) {
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const auto id = p.member.id;
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if (!id)
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continue;
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const bool direct = s.mode == Mode::join && id != s.host_id;
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if (physical(id) == links.end()) {
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if (!direct) {
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disconnect(s, id,
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s.mode == Mode::join ? s.transport.status().detail : "A player disconnected.");
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if (s.mode == Mode::off)
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return;
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} else {
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if (p.connected_at || p.direct_ready)
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reset_direct(s, p, now);
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if (p.handshaken && now >= p.next_dial &&
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dial_peer(s.transport.status().local_id, id, s.host_id)) {
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p.next_dial = now + 3000000;
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s.transport.connect_peer(id);
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}
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}
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}
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}
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if (s.mode == Mode::join && physical(s.host_id) == links.end()) {
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stop(s, s.transport.status().detail);
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return;
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}
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// The backend's bans (reskate_banned) arrive while a session runs: a banned player stops
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// hosting theirs, and nobody stays with a banned host. A banned guest is for the host or
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// the server to turn away (below, and Host::tick), which a server may choose not to.
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if (s.mode == Mode::host && reskate_banned(s.transport.status().local_id)) {
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stop(s, std::string(banned_notice));
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return;
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}
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if (s.mode == Mode::join && reskate_banned(s.host_id)) {
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stop(s, "This host is banned from ReSkate multiplayer.");
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return;
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}
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for (const auto &link : links) {
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if (s.mode == Mode::host && s.banned.contains(link.id)) {
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s.transport.disconnect(link.id, "You were kicked from this session.");
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continue;
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}
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if (s.mode == Mode::host && is_banned(s, link.id)) {
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s.transport.disconnect(link.id, "You are banned from this host's lobbies.");
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continue;
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}
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if (s.mode == Mode::host && reskate_banned(link.id)) {
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s.transport.disconnect(link.id, banned_notice.data());
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continue;
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}
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auto *p = find_peer(s, link.id);
|
|
if (!p && s.mode == Mode::host && s.join_backoff.waiting(link.id, now)) {
|
|
s.transport.disconnect(link.id, "Too many failed attempts to join. Wait a little and try again.");
|
|
continue;
|
|
}
|
|
if (!p && s.mode == Mode::host)
|
|
p = &reserve(s, link.id, now);
|
|
if (!p) {
|
|
// The initial host is reserved here; all other identities need a roster.
|
|
if (s.mode == Mode::join && link.id == s.host_id)
|
|
p = &reserve(s, link.id, now);
|
|
else {
|
|
s.transport.disconnect(link.id, "Identity is not in the host roster.");
|
|
continue;
|
|
}
|
|
}
|
|
if (link.connected && !p->connected_at)
|
|
p->connected_at = now;
|
|
if (s.mode == Mode::join && link.id != s.host_id && world_playing(s, local) && link.connected && p->handshaken &&
|
|
!p->direct_ready && now - p->last_direct_hello >= 1000000) {
|
|
send_required(s, link.id, encode_wire(packet(s, PacketKind::peer_hello, now)));
|
|
p->last_direct_hello = now;
|
|
}
|
|
}
|
|
auto *host = find_peer(s, s.host_id);
|
|
if (s.mode == Mode::join && host && host->connected_at && !host->handshaken &&
|
|
(s.awaiting_map || !local.ready) && now - s.last_map_request >= 1000000) {
|
|
auto request = packet(s, PacketKind::map_request, now);
|
|
request.map = s.join_destination.empty() ? 0 : map_hash(s.join_destination);
|
|
if (s.password && host->password_challenge && request.map) {
|
|
request.challenge = host->password_challenge;
|
|
request.proof = password_proof(*s.password, s.secret, request.map, s.host_id, request.source,
|
|
host->member.epoch, s.epoch, request.challenge);
|
|
}
|
|
send_required(s, s.host_id, encode_wire(request));
|
|
s.last_map_request = now;
|
|
}
|
|
if (s.mode == Mode::join && host && host->connected_at && !host->handshaken && local.ready &&
|
|
!s.awaiting_map &&
|
|
now - s.last_hello >= 1000000) {
|
|
auto hello = packet(s, PacketKind::hello, now);
|
|
// Our name, for a dedicated server that has no Steam friends list to look it up.
|
|
hello.text = s.transport.name(hello.source);
|
|
while (!hello.text.empty() && !valid_member_name(hello.text)) hello.text.pop_back();
|
|
if (s.password && host->password_challenge) {
|
|
hello.challenge = host->password_challenge;
|
|
hello.proof = password_proof(*s.password, s.secret, s.map, s.host_id, hello.source,
|
|
host->member.epoch, s.epoch, hello.challenge);
|
|
}
|
|
send_required(s, s.host_id, encode_wire(hello));
|
|
s.last_hello = now;
|
|
}
|
|
const auto messages = s.transport.receive();
|
|
const auto stale = stale_pose_deltas(s, messages);
|
|
for (std::size_t index = 0; index < messages.size(); ++index) {
|
|
const auto &message = messages[index];
|
|
auto *link = find_peer(s, message.peer);
|
|
if (!link)
|
|
continue;
|
|
const bool direct_link = s.mode == Mode::join && message.peer != s.host_id;
|
|
if (!link->budget.accept(message.arrived ? message.arrived : now, message.bytes.size(),
|
|
s.mode == Mode::join && !direct_link ? max_remote_players : 1U)) {
|
|
disconnect(s, message.peer, "Peer exceeded the multiplayer packet limit.");
|
|
if (s.mode == Mode::off)
|
|
return;
|
|
continue;
|
|
}
|
|
if (stale[index])
|
|
continue;
|
|
bool missing_reference{};
|
|
auto decoded = link->receiver.receive(message.bytes, missing_reference, s.world);
|
|
if (missing_reference)
|
|
continue;
|
|
if (!decoded || decoded->session != s.secret ||
|
|
((s.mode == Mode::host || direct_link) && decoded->source != message.peer)) {
|
|
disconnect(s, message.peer, "Join code, sender identity, or multiplayer protocol did not match.");
|
|
if (s.mode == Mode::off)
|
|
return;
|
|
continue;
|
|
}
|
|
const auto &p = *decoded;
|
|
// A dedicated server sends no poses; its roster and control traffic keep it alive.
|
|
if (dedicated_host(s) && message.peer == s.host_id) link->last_packet = now;
|
|
if (p.kind == PacketKind::world_state) {
|
|
if (s.mode != Mode::join || message.peer != s.host_id || p.source != s.host_id ||
|
|
!link->handshaken || p.epoch != link->member.epoch ||
|
|
p.build != supported_build::game_sha256_bytes) {
|
|
disconnect(s, message.peer, "Only the admitted host may change the room's map.");
|
|
if (s.mode == Mode::off) return;
|
|
continue;
|
|
}
|
|
if (p.world < s.world || (p.world == s.world && s.world_state_sequence &&
|
|
!newer_sequence(p.sequence, s.world_state_sequence)))
|
|
continue;
|
|
if (p.world > s.world) {
|
|
clear_world(s, now);
|
|
s.world = p.world;
|
|
s.travelling = s.awaiting_map = s.join_map_authorized = true;
|
|
s.host_world_ready = false;
|
|
s.travel_started = s.join_started = now;
|
|
s.join_destination.clear();
|
|
s.map_name.clear();
|
|
s.map_label.clear();
|
|
s.map = 0;
|
|
s.map_load_submitted = false;
|
|
s.last_map_load_check = 0;
|
|
}
|
|
if (!s.join_destination.empty() && !p.destination.empty() && s.map != p.map) {
|
|
stop(s, "The host changed destinations without starting a new map transition.");
|
|
return;
|
|
}
|
|
s.world_state_sequence = p.sequence;
|
|
if (!p.destination.empty()) {
|
|
s.join_destination = s.map_name = p.destination;
|
|
s.map_label = p.map_label;
|
|
s.map = p.map;
|
|
}
|
|
s.host_world_ready = p.world_ready;
|
|
link->world_ready = p.world_ready;
|
|
link->last_packet = now;
|
|
if (s.travelling)
|
|
s.status = p.world_ready ? "Host map ready. Waiting for local loading..."
|
|
: "The host is changing maps. Your session stays connected.";
|
|
continue;
|
|
}
|
|
if (p.kind == PacketKind::world_ready) {
|
|
if (s.mode != Mode::host || !link->handshaken || p.source != message.peer ||
|
|
p.epoch != link->member.epoch) {
|
|
disconnect(s, message.peer, "Invalid map readiness message.");
|
|
if (s.mode == Mode::off) return;
|
|
continue;
|
|
}
|
|
if (p.world != s.world || p.map != s.map ||
|
|
(link->ready_sequence && !newer_sequence(p.sequence, link->ready_sequence)))
|
|
continue;
|
|
link->ready_sequence = p.sequence;
|
|
link->last_packet = now;
|
|
const bool arrived = p.world_ready && !link->world_ready;
|
|
link->world_ready = p.world_ready;
|
|
if (p.world_ready) link->travel_since = 0;
|
|
if (arrived) {
|
|
send_required(s, message.peer, s.cosmetic_packet);
|
|
for (const auto &other : active_peers(s))
|
|
if (other.handshaken && other.member.id != message.peer)
|
|
send_required(s, message.peer, other.cosmetic_packet);
|
|
}
|
|
continue;
|
|
}
|
|
if (p.kind == PacketKind::map_request) {
|
|
if (s.mode != Mode::host || p.source != message.peer ||
|
|
p.build != supported_build::game_sha256_bytes ||
|
|
(link->member.epoch && link->member.epoch != p.epoch)) {
|
|
disconnect(s, message.peer, "Invalid host map request. Update ReSkate and join again.");
|
|
if (s.mode == Mode::off)
|
|
return;
|
|
continue;
|
|
}
|
|
if (link->handshaken || !local.ready || !valid_map_destination(s.map_name))
|
|
continue;
|
|
if (p.map && p.map != s.map) {
|
|
disconnect(s, message.peer, "The host changed maps while you were joining. Join again.");
|
|
continue;
|
|
}
|
|
link->member.epoch = p.epoch;
|
|
bool authorized = !s.password;
|
|
if (s.password) {
|
|
if (!link->password_challenge)
|
|
link->password_challenge = nonce();
|
|
if (p.challenge == link->password_challenge) {
|
|
const auto proof = password_proof(*s.password, s.secret, s.map, s.host_id, message.peer,
|
|
s.epoch, p.epoch, link->password_challenge);
|
|
if (!proof_matches(proof, p.proof)) {
|
|
disconnect(s, message.peer, "Incorrect lobby password.");
|
|
continue;
|
|
}
|
|
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(s, PacketKind::map_offer, now);
|
|
offer.destination = s.map_name;
|
|
offer.challenge = link->password_challenge;
|
|
offer.map_authorized = authorized;
|
|
send_required(s, message.peer, encode_wire(offer));
|
|
link->last_map_offer = now;
|
|
}
|
|
continue;
|
|
}
|
|
if (p.kind == PacketKind::map_offer) {
|
|
if (link->handshaken || p.world < s.world) continue;
|
|
if (s.mode != Mode::join || message.peer != s.host_id || p.source != s.host_id ||
|
|
p.build != supported_build::game_sha256_bytes ||
|
|
(link->member.epoch && p.epoch != link->member.epoch) ||
|
|
(!s.join_destination.empty() && map_hash(s.join_destination) != p.map) ||
|
|
(!p.map_authorized && !p.challenge)) {
|
|
disconnect(s, message.peer, "Host map or session changed. Join again.");
|
|
if (s.mode == Mode::off)
|
|
return;
|
|
continue;
|
|
}
|
|
if (link->handshaken)
|
|
continue;
|
|
if (p.challenge && !s.password) {
|
|
stop(s, "This lobby requires a password. Use Join with password and try again.");
|
|
return;
|
|
}
|
|
const bool new_challenge = link->password_challenge != p.challenge;
|
|
link->member.epoch = p.epoch;
|
|
link->password_challenge = p.challenge;
|
|
link->map_authorized |= p.map_authorized;
|
|
s.join_destination = p.destination;
|
|
s.map_label = p.map_label;
|
|
s.world = p.world;
|
|
s.join_map_authorized |= p.map_authorized;
|
|
if (new_challenge)
|
|
s.last_map_request = 0;
|
|
if (!s.join_map_authorized)
|
|
s.status = "Checking lobby password before loading the host's map...";
|
|
continue;
|
|
}
|
|
// A map reload can return to the same asset. The generation prevents
|
|
// late poses, audio, cosmetics and control from reviving the old world.
|
|
if (p.world != s.world) continue;
|
|
if (p.kind == PacketKind::peer_hello || p.kind == PacketKind::peer_welcome) {
|
|
if (!world_playing(s, local)) continue;
|
|
if (!direct_link || !link->handshaken ||
|
|
!greeting_error(p, s.secret, local.ready ? s.map : 0, supported_build::game_sha256_bytes,
|
|
link->member.epoch)
|
|
.empty()) {
|
|
disconnect(s, message.peer, "Direct peer is not admitted to this session.");
|
|
if (s.mode == Mode::off)
|
|
return;
|
|
continue;
|
|
}
|
|
const bool first = !link->direct_ready;
|
|
link->direct_ready = true;
|
|
link->world_ready = true;
|
|
if (p.kind == PacketKind::peer_hello)
|
|
send_required(s, message.peer, encode_wire(packet(s, PacketKind::peer_welcome, now)));
|
|
if (first) {
|
|
send_required(s, message.peer, s.cosmetic_packet);
|
|
s.last_routes = 0;
|
|
}
|
|
continue;
|
|
}
|
|
if (p.kind == PacketKind::challenge) {
|
|
if (s.mode != Mode::join || message.peer != s.host_id || p.source != s.host_id || !p.challenge ||
|
|
!greeting_error(p, s.secret, local.ready ? s.map : 0, supported_build::game_sha256_bytes,
|
|
link->member.epoch)
|
|
.empty()) {
|
|
disconnect(s, message.peer, "Invalid lobby password challenge.");
|
|
if (s.mode == Mode::off)
|
|
return;
|
|
continue;
|
|
}
|
|
if (!s.password) {
|
|
stop(s, "This lobby requires a password. Enter it in Join and try again.");
|
|
return;
|
|
}
|
|
if (!link->handshaken) {
|
|
link->member.epoch = p.epoch;
|
|
link->password_challenge = p.challenge;
|
|
s.last_hello = 0;
|
|
}
|
|
continue;
|
|
}
|
|
if (p.kind == PacketKind::hello || p.kind == PacketKind::welcome) {
|
|
if (!world_playing(s, local)) continue;
|
|
if (direct_link || p.source != message.peer ||
|
|
(s.mode == Mode::host ? p.kind != PacketKind::hello : p.kind != PacketKind::welcome)) {
|
|
disconnect(s, message.peer, "Unexpected multiplayer handshake direction.");
|
|
if (s.mode == Mode::off)
|
|
return;
|
|
continue;
|
|
}
|
|
const auto error =
|
|
greeting_error(p, s.secret, local.ready ? s.map : 0, supported_build::game_sha256_bytes,
|
|
link->handshaken ? link->member.epoch : 0);
|
|
if (!error.empty()) {
|
|
disconnect(s, message.peer, std::string(error));
|
|
if (s.mode == Mode::off)
|
|
return;
|
|
continue;
|
|
}
|
|
if (s.mode == Mode::host && s.password && !link->handshaken) {
|
|
if (!link->password_challenge)
|
|
link->password_challenge = nonce();
|
|
if (p.challenge != link->password_challenge) {
|
|
auto challenge = packet(s, PacketKind::challenge, now);
|
|
challenge.challenge = link->password_challenge;
|
|
send_required(s, message.peer, encode_wire(challenge));
|
|
continue;
|
|
}
|
|
const auto proof = password_proof(*s.password, s.secret, s.map, s.host_id, message.peer,
|
|
s.epoch, p.epoch, link->password_challenge);
|
|
if (!proof_matches(proof, p.proof)) {
|
|
disconnect(s, message.peer, "Incorrect lobby password.");
|
|
continue;
|
|
}
|
|
}
|
|
const bool joined = !link->handshaken;
|
|
link->member.epoch = p.epoch;
|
|
link->handshaken = true;
|
|
link->world_ready = true;
|
|
link->travel_since = 0;
|
|
link->last_packet = now;
|
|
if (joined) s.join_backoff.joined(message.peer);
|
|
if (s.mode == Mode::host) {
|
|
send_required(s, message.peer, encode_wire(packet(s, PacketKind::welcome, now)));
|
|
if (joined) {
|
|
send_roster(s, now);
|
|
if (!s.tuning_packet.empty()) send_required(s, message.peer, s.tuning_packet);
|
|
if (!s.extras_packet.empty()) send_required(s, message.peer, s.extras_packet);
|
|
send_required(s, message.peer, s.cosmetic_packet);
|
|
for (const auto &other : active_peers(s))
|
|
if (other.handshaken && other.member.id != message.peer)
|
|
send_required(s, message.peer, other.cosmetic_packet);
|
|
}
|
|
} else if (joined)
|
|
send_required(s, message.peer, s.cosmetic_packet);
|
|
s.status = "Connected through Steam. Network updates: " + std::to_string(s.tps) + " TPS.";
|
|
continue;
|
|
}
|
|
if (p.kind == PacketKind::cosmetics) {
|
|
defer_cosmetics(*link, p, now);
|
|
continue;
|
|
}
|
|
// A guest's report of how its mods change trick scoring; read before the map check, so one
|
|
// sent while the guest is still loading the host's map counts.
|
|
if (p.kind == PacketKind::scoring) {
|
|
if (s.mode == Mode::host && !direct_link && link->handshaken && p.source == message.peer &&
|
|
p.epoch == link->member.epoch && link->scoring_budget.accept(now, 4)) {
|
|
link->last_packet = now;
|
|
link->scoring = p.scoring;
|
|
link->scoring_mods = p.text;
|
|
judge_scoring(s, *link);
|
|
}
|
|
continue;
|
|
}
|
|
if (!link->handshaken || p.map != s.map || (direct_link && !link->direct_ready))
|
|
continue;
|
|
if (p.kind == PacketKind::routes) {
|
|
const bool valid =
|
|
s.mode == Mode::host && p.source == message.peer && p.epoch == link->member.epoch;
|
|
if (!valid) {
|
|
disconnect(s, message.peer, "Invalid direct route report.");
|
|
if (s.mode == Mode::off)
|
|
return;
|
|
continue;
|
|
}
|
|
if (!link->route_reported || newer_sequence(p.sequence, link->route_sequence)) {
|
|
link->direct_routes.clear();
|
|
// Reports can cross a roster update during a departure/rejoin.
|
|
// Discard stale entries, never disconnect healthy reporters.
|
|
for (const auto &m : p.members) {
|
|
const auto *other = find_peer(s, m.id);
|
|
if (other && other->handshaken && other->member.epoch == m.epoch && m.id != message.peer)
|
|
link->direct_routes.push_back(m);
|
|
}
|
|
link->route_reported = now;
|
|
link->route_sequence = p.sequence;
|
|
}
|
|
continue;
|
|
}
|
|
if (p.kind == PacketKind::roster) {
|
|
if (s.mode != Mode::join || message.peer != s.host_id) {
|
|
disconnect(s, message.peer, "Only the host may publish the player roster.");
|
|
continue;
|
|
}
|
|
apply_roster(s, p, now);
|
|
continue;
|
|
}
|
|
// Only the host (or dedicated server) moves players: tpall and tphere.
|
|
if (p.kind == PacketKind::teleport) {
|
|
if (s.mode == Mode::join && message.peer == s.host_id && p.source == s.host_id &&
|
|
dingosdk::teleport_local_skater(p.teleport))
|
|
add_chat(s, 0, "ReSkate", dedicated_host(s) ? "A server admin teleported you." : "The host teleported you.");
|
|
continue;
|
|
}
|
|
// The host's physics tuning (Extension/Skater/physics_tuning.h), for its guests only.
|
|
if (p.kind == PacketKind::physics_tuning) {
|
|
if (s.mode == Mode::join && message.peer == s.host_id && p.source == s.host_id && !dedicated_host(s))
|
|
s.host_tuning = std::move(p.tuning);
|
|
continue;
|
|
}
|
|
// And the physics its tuning does not carry (Engine/Game/Multiplayer/session_physics.h).
|
|
if (p.kind == PacketKind::physics_extras) {
|
|
if (s.mode == Mode::join && message.peer == s.host_id && p.source == s.host_id && !dedicated_host(s))
|
|
s.host_extras = p.extras;
|
|
continue;
|
|
}
|
|
if (p.kind == PacketKind::maps) {
|
|
if (dedicated_host(s) && message.peer == s.host_id && p.source == s.host_id) {
|
|
s.server_maps = p.maps;
|
|
s.server_map_pool.clear();
|
|
for (const auto entry : p.map_pool) s.server_map_pool.push_back(p.maps[entry]);
|
|
s.server_map_rotation = p.map_rotation;
|
|
publish(s);
|
|
publish_chat(s);
|
|
}
|
|
continue;
|
|
}
|
|
if (p.kind == PacketKind::bans) {
|
|
if (dedicated_host(s) && message.peer == s.host_id && p.source == s.host_id) {
|
|
s.server_bans = p.bans;
|
|
s.server_ban_total = p.ban_total;
|
|
publish(s);
|
|
}
|
|
continue;
|
|
}
|
|
// Whoever hosts telling us about a party invite; or, hosting a lobby, a guest asking
|
|
// for something to be done with their party.
|
|
if (p.kind == PacketKind::party) {
|
|
if (s.mode == Mode::join) {
|
|
if (message.peer == s.host_id && p.source == s.host_id) receive_party(s, p, now);
|
|
} else if (s.mode == Mode::host) {
|
|
auto *sender = find_peer(s, p.source);
|
|
if (!direct_link && sender && sender->handshaken && message.peer == p.source &&
|
|
routed_source(p, sender->member, message.peer, true, s.host_id) && sender->party_budget.accept(now, 20))
|
|
host_party_request(s, p.source, p.party_action, p.party_player, now);
|
|
}
|
|
continue;
|
|
}
|
|
// A dedicated server's answer to one of our admin requests, or a lobby host's to a
|
|
// party request: a line for this player only.
|
|
if (p.kind == PacketKind::admin) {
|
|
if (s.mode == Mode::join && message.peer == s.host_id && p.source == s.host_id)
|
|
add_chat(s, 0, dedicated_host(s) ? "Server" : "ReSkate", p.text);
|
|
continue;
|
|
}
|
|
// Chat is accepted while either side is still loading a map: it needs
|
|
// only an authenticated sender, never the world.
|
|
if (p.kind == PacketKind::chat) {
|
|
auto *sender = find_peer(s, p.source);
|
|
if (!sender || !sender->handshaken) continue;
|
|
// Another guest's own copy of a line they said: proof of the host's, never a line.
|
|
if (direct_link) {
|
|
if (routed_source(p, sender->member, message.peer, false, s.host_id, true)) proven_chat(s, *sender, p, now);
|
|
continue;
|
|
}
|
|
if (!routed_source(p, sender->member, message.peer, s.mode == Mode::host, s.host_id))
|
|
continue;
|
|
// A dedicated server speaks (welcome message, its console) as "Server".
|
|
const bool server = dedicated_host(s) && sender->member.id == s.host_id;
|
|
// Everyone holds everyone to the same pace, so a modified client cannot flood.
|
|
if (!server && sender->chat_rate.accept(now, p.text, 1) != ChatRate::Verdict::accepted) continue;
|
|
sender->last_packet = now;
|
|
// "/p": party chat, which a lobby's host relays to the sender's party and nobody else.
|
|
if (s.mode == Mode::host && p.text.starts_with("/p ")) {
|
|
host_party_chat(s, sender->member.id, std::string_view(p.text).substr(3), now);
|
|
continue;
|
|
}
|
|
if (owes_proof(s, *sender)) relayed_chat(s, *sender, p, now);
|
|
else add_chat(s, sender->member.id, server ? std::string("Server") : chat_name(s, *sender), p.text);
|
|
if (s.mode == Mode::host) broadcast(s, p, true, false, now, p.source);
|
|
continue;
|
|
}
|
|
// Throwdown messages are relayed like chat, but only within one map: a drop
|
|
// belongs to the world it was placed in.
|
|
if (p.kind == PacketKind::throwdown) {
|
|
auto *sender = find_peer(s, p.source);
|
|
if (direct_link || !sender || !sender->handshaken || p.map != s.map || p.world != s.world ||
|
|
!routed_source(p, sender->member, message.peer, s.mode == Mode::host, s.host_id))
|
|
continue;
|
|
if (!sender->throwdown_budget.accept(now, throwdown_burst)) continue;
|
|
sender->last_packet = now;
|
|
// A player whose mods change scoring or physics takes part in nothing linked: the host
|
|
// passes none of theirs on.
|
|
if (sender->member.scoring) continue;
|
|
if (s.throwdown_inbox.size() < 256) s.throwdown_inbox.emplace_back(p.source, p.throwdown);
|
|
if (s.mode == Mode::host) broadcast(s, p, true, false, now, p.source);
|
|
continue;
|
|
}
|
|
// A host-ready notice and its fresh cosmetics can share one receive
|
|
// batch. Accept them once our target skater is loaded, even though the
|
|
// local transition is finalized on the next tick.
|
|
if (!local.ready || s.awaiting_map || !s.host_world_ready || !s.started_map ||
|
|
(s.mode == Mode::host && !link->world_ready)) continue;
|
|
auto *source = find_peer(s, p.source);
|
|
if (!source || !source->handshaken ||
|
|
!routed_source(p, source->member, message.peer, s.mode == Mode::host, s.host_id, direct_link))
|
|
continue;
|
|
if (p.kind == PacketKind::away) {
|
|
disconnect(s, message.peer, "A player ended their session.");
|
|
if (s.mode == Mode::off)
|
|
return;
|
|
continue;
|
|
}
|
|
if (direct_link && p.kind == PacketKind::pose)
|
|
link->last_direct_pose = now;
|
|
if (p.kind == PacketKind::objects) {
|
|
if (direct_link) { disconnect(s, message.peer, "Object updates must use the host route."); continue; }
|
|
const auto result = source->objects.receive(p.objects);
|
|
if (result == ObjectState::Result::invalid) {
|
|
disconnect(s, message.peer, "Invalid shared object revision or layout.");
|
|
if (s.mode == Mode::off) return;
|
|
} else source->last_packet = now;
|
|
continue;
|
|
}
|
|
if (p.kind == PacketKind::voice) {
|
|
if (!s.voice_policy.accepts(p.voice) || (s.mode == Mode::join && !s.roster_sequence)) continue;
|
|
if (direct_link || (source->received_voice && !newer_sequence(p.sequence, source->voice_sequence))) continue;
|
|
if (!source->voice_budget.accept(now, p.voice.bytes.size())) continue;
|
|
source->received_voice = true;
|
|
source->voice_sequence = p.sequence;
|
|
source->last_packet = now;
|
|
s.voice.receive(p);
|
|
if (s.mode == Mode::host) broadcast(s, p, false, true, now, p.source);
|
|
continue;
|
|
}
|
|
// The host forwards what it accepts, so it keeps the packet; a guest moves the
|
|
// pose into playback instead of copying it.
|
|
if (s.mode != Mode::host)
|
|
accept_data(*source, std::move(*decoded), now);
|
|
else if (accept_data(*source, p, now))
|
|
broadcast(s, p, p.kind == PacketKind::cosmetics ||
|
|
(p.kind == PacketKind::audio && std::any_of(p.audio.begin(), p.audio.end(),
|
|
[](const auto &sample) { return sample.event; })),
|
|
p.kind != PacketKind::cosmetics, now, p.source);
|
|
}
|
|
receive_cosmetics(s, local, now);
|
|
for (std::size_t i = 0; i < s.used_slots; ++i) {
|
|
const auto &p = s.peers[i];
|
|
if (!p.member.id)
|
|
continue;
|
|
if (s.mode == Mode::join && p.member.id != s.host_id) {
|
|
if (world_playing(s, local) && p.connected_at && !p.direct_ready && now - p.connected_at > 8000000)
|
|
disconnect(s, p.member.id, "Direct handshake timed out; using host forwarding.");
|
|
continue;
|
|
}
|
|
// Authorized arrivals get time for native loading; this has an absolute
|
|
// deadline, so requests cannot keep an unused slot reserved indefinitely.
|
|
const std::uint64_t handshake_timeout = p.map_authorized ? 180000000 : 8000000;
|
|
if (p.handshaken && (s.travelling || p.travel_since)) {
|
|
if (p.travel_since && now - p.travel_since > 180000000) {
|
|
disconnect(s, p.member.id, "A player could not finish loading the new map.");
|
|
if (s.mode == Mode::off) return;
|
|
}
|
|
continue;
|
|
}
|
|
if ((!p.handshaken && p.connected_at && now - p.connected_at > handshake_timeout) ||
|
|
(p.handshaken && now - p.last_packet > 10000000)) {
|
|
disconnect(s, p.member.id, "A player timed out while waiting for gameplay data.");
|
|
if (s.mode == Mode::off)
|
|
return;
|
|
}
|
|
}
|
|
if (s.mode == Mode::join && world_playing(s, local) && now - s.last_routes >= 250000) {
|
|
if (const auto *host_peer = find_peer(s, s.host_id); host_peer && host_peer->handshaken) {
|
|
auto report = packet(s, PacketKind::routes, now);
|
|
for (const auto &p : active_peers(s))
|
|
if (p.member.id != s.host_id && p.direct_ready && p.last_direct_pose &&
|
|
now - p.last_direct_pose <= 500000)
|
|
report.members.push_back({p.member.id, p.member.epoch, {}});
|
|
// A report can expire safely: failed/skipped reports leave relay enabled.
|
|
if (send_packet(s, s.host_id, report, false, true))
|
|
s.last_routes = now;
|
|
}
|
|
}
|
|
update_scoring(s, now); // before the roster, so a host's own flag goes out with it
|
|
tick_host_parties(s, now); // and the lobby's parties, which the roster carries
|
|
if (s.mode == Mode::host && world_playing(s, local) && (s.roster_dirty || now - s.last_roster > 2000000))
|
|
send_roster(s, now);
|
|
const auto peers = active_peers(s);
|
|
if (s.mode == Mode::host && (s.travelling || !s.last_world_state ||
|
|
std::any_of(peers.begin(), peers.end(), [](const auto &peer) { return peer.handshaken && !peer.world_ready; })) &&
|
|
(!s.last_world_state || now - s.last_world_state >= 1000000) && (s.travelling || s.world > 1))
|
|
send_world_state(s, now);
|
|
if (s.mode == Mode::join && s.world > 1 && (s.travelling || !s.last_world_ready) &&
|
|
(!s.last_world_ready || now - s.last_world_ready >= 1000000)) {
|
|
if (const auto *host_peer = find_peer(s, s.host_id); host_peer && host_peer->handshaken) {
|
|
auto ready = packet(s, PacketKind::world_ready, now);
|
|
ready.world_ready = local.ready && !s.awaiting_map;
|
|
send_required(s, s.host_id, encode_wire(ready));
|
|
s.last_world_ready = now;
|
|
}
|
|
}
|
|
if (s.public_host)
|
|
s.lobbies.update_host(world_playing(s, local), static_cast<unsigned>(s.transport.status().peers.size()) + 1,
|
|
s.map_name, now);
|
|
if (s.mode == Mode::host && !s.travelling && s.travel_started &&
|
|
std::none_of(peers.begin(), peers.end(), [](const auto &peer) { return peer.handshaken && !peer.world_ready; })) {
|
|
s.travel_started = 0;
|
|
s.status = "Map changed. All connected players are ready.";
|
|
}
|
|
}
|
|
} // namespace session_detail
|
|
} // namespace dingosdk::multiplayer
|