mirror of
https://github.com/Dingo-Shenanigans/ReSkate.git
synced 2026-10-17 22:07:05 +02:00
353 lines
15 KiB
C++
353 lines
15 KiB
C++
#include "offline_steam.h"
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#include "Engine/Core/Hooks/hooks.h"
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#include "Engine/Core/Log/logging.h"
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#include "Engine/Core/Platform/launcher_support.h"
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#include <array>
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#include <atomic>
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#include <cstring>
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#include <ctime>
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#include <deque>
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#include <memory>
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#include <mutex>
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#include <stdexcept>
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#include <string_view>
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#include <utility>
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#include <vector>
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namespace dingosdk::offline_steam {
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namespace {
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// Interfaces Skate.exe requests by version string. Every method of every
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// interface is a stub that returns 0 and logs its first call; the overrides
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// below give the methods the game depends on real answers. Slot numbers come
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// from the vtable offsets in the shipped steam_api64.dll flat exports.
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enum Interface : int {
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user, friends, utils, matchmaking, matchmaking_servers, networking,
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networking_messages, networking_sockets, networking_utils, input,
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controller, parties, game_search, apps, user_stats, remote_storage, remote_play,
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unknown, interface_count
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};
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constexpr std::array<const char*, interface_count> interface_names{
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"SteamUser", "SteamFriends", "SteamUtils", "SteamMatchMaking", "SteamMatchMakingServers",
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"SteamNetworking", "SteamNetworkingMessages", "SteamNetworkingSockets",
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"SteamNetworkingUtils", "SteamInput", "SteamController", "SteamParties",
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"SteamMatchGameSearch", "SteamApps", "SteamUserStats", "SteamRemoteStorage",
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"SteamRemotePlay", "unknown"};
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constexpr std::size_t slot_count = 128;
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constexpr std::uint32_t app_id = 3354750;
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constexpr char empty[] = "";
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std::array<std::array<std::atomic<bool>, slot_count>, interface_count> called{};
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void note(int interface, std::size_t slot) noexcept {
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if (called[interface][slot].exchange(true)) return;
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try {
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logging::log(logging::Level::info, logging::Channel::network,
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"Offline Steam: first call to {} slot {}", interface_names[interface], slot);
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} catch (...) {}
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}
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template<int I, std::size_t S>
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std::uint64_t stub(void*) noexcept { note(I, S); return 0; }
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template<int I, std::size_t... S>
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std::array<void*, slot_count> make_table(std::index_sequence<S...>) {
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#pragma warning(push)
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#pragma warning(disable: 4191)
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return {reinterpret_cast<void*>(&stub<I, S>)...};
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#pragma warning(pop)
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}
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struct Object { void** vtable; std::array<std::uint8_t, 248> padding{}; };
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template<int I> std::array<void*, slot_count> table = make_table<I>(std::make_index_sequence<slot_count>{});
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std::array<Object, interface_count> objects{};
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// ---------------------------------------------------------------- callbacks
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// Same declaration as Steamworks' CCallbackBase, so MSVC lays the vtable out
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// exactly as the game's compiled callbacks expect.
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class CallbackBase {
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public:
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virtual void Run(void* param) = 0;
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virtual void Run(void* param, bool io_failure, std::uint64_t call) = 0;
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virtual int GetCallbackSizeBytes() = 0;
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std::uint8_t flags;
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int id;
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};
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std::mutex callback_mutex;
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std::vector<CallbackBase*> callbacks;
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std::deque<std::pair<int, std::vector<std::uint8_t>>> pending;
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template<class T> void post(int id, const T& payload) {
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std::vector<std::uint8_t> bytes(sizeof(T));
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std::memcpy(bytes.data(), &payload, sizeof(T));
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std::lock_guard lock(callback_mutex);
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pending.emplace_back(id, std::move(bytes));
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}
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void __cdecl register_callback(CallbackBase* callback, int id) {
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if (!callback) return;
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callback->flags |= 1;
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callback->id = id;
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std::lock_guard lock(callback_mutex);
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callbacks.push_back(callback);
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}
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void __cdecl unregister_callback(CallbackBase* callback) {
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if (!callback) return;
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callback->flags &= static_cast<std::uint8_t>(~1u);
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std::lock_guard lock(callback_mutex);
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std::erase(callbacks, callback);
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}
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void __cdecl register_call_result(void*, std::uint64_t) {}
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void __cdecl unregister_call_result(void*, std::uint64_t) {}
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void __cdecl run_callbacks() {
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for (;;) {
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std::pair<int, std::vector<std::uint8_t>> next;
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std::vector<CallbackBase*> targets;
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{
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std::lock_guard lock(callback_mutex);
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if (pending.empty()) return;
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next = std::move(pending.front());
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pending.pop_front();
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for (auto* callback : callbacks) if (callback->id == next.first) targets.push_back(callback);
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}
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for (auto* callback : targets) callback->Run(next.second.data());
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}
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}
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// ---------------------------------------------------------------- overrides
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using Uint64Out = std::uint64_t*;
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// Methods returning CSteamID use MSVC's hidden return pointer (after this).
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Uint64Out zero_steam_id(void*, Uint64Out out) noexcept { if (out) *out = 0; return out; }
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const char* empty_string(void*) noexcept { return empty; }
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std::uint64_t one(void*) noexcept { return 1; }
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// ISteamUser
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Uint64Out user_steam_id(void*, Uint64Out out) noexcept { if (out) *out = steam_id(); return out; }
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std::atomic<std::uint32_t> next_ticket{1};
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#pragma pack(push, 8)
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struct AuthSessionTicketResponse { std::uint32_t ticket; int result; };
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struct WebApiTicketResponse { std::uint32_t ticket; int result; int size; std::uint8_t data[2560]; };
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#pragma pack(pop)
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void fill_ticket(std::uint8_t* data, std::uint32_t size) noexcept {
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const auto id = steam_id();
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for (std::uint32_t i = 0; i < size; ++i) data[i] = static_cast<std::uint8_t>(id >> (8 * (i % 8)));
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}
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std::uint32_t auth_session_ticket(void*, void* ticket, int capacity, std::uint32_t* size, const void*) noexcept {
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const auto handle = next_ticket.fetch_add(1);
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const auto length = static_cast<std::uint32_t>(capacity >= 64 ? 64 : (capacity > 0 ? capacity : 0));
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if (ticket) fill_ticket(static_cast<std::uint8_t*>(ticket), length);
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if (size) *size = length;
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try { post(163, AuthSessionTicketResponse{handle, 1}); } catch (...) {}
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return handle;
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}
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std::uint32_t web_api_ticket(void*, const char*) noexcept {
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const auto handle = next_ticket.fetch_add(1);
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try {
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auto response = std::make_unique<WebApiTicketResponse>();
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response->ticket = handle;
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response->result = 1;
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response->size = 64;
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fill_ticket(response->data, 64);
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post(168, *response);
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} catch (...) {}
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return handle;
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}
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// ISteamFriends
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const char* persona_name(void*) noexcept { return launcher::offline_player_name; }
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// ISteamUtils
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std::uint64_t server_time(void*) noexcept { return static_cast<std::uint32_t>(std::time(nullptr)); }
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const char* country(void*) noexcept { return "US"; }
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const char* language(void*) noexcept { return "english"; }
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const char* language_list(void*) noexcept { return "english"; }
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std::uint64_t battery(void*) noexcept { return 255; }
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std::uint64_t app(void*) noexcept { return app_id; }
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// ISteamNetworkingUtils
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std::uint64_t local_timestamp(void*) noexcept {
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LARGE_INTEGER counter{}, frequency{};
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QueryPerformanceCounter(&counter);
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QueryPerformanceFrequency(&frequency);
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return static_cast<std::uint64_t>(counter.QuadPart / frequency.QuadPart * 1000000 +
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counter.QuadPart % frequency.QuadPart * 1000000 / frequency.QuadPart) + 1000000;
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}
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template<int I> void set(std::size_t slot, auto function) {
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#pragma warning(push)
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#pragma warning(disable: 4191)
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table<I>[slot] = reinterpret_cast<void*>(function);
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#pragma warning(pop)
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}
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void build_objects() {
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set<user>(0, &one); // GetHSteamUser
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set<user>(1, &one); // BLoggedOn
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set<user>(2, &user_steam_id); // GetSteamID
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set<user>(13, &auth_session_ticket); // GetAuthSessionTicket
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set<user>(14, &web_api_ticket); // GetAuthTicketForWebApi
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set<user>(24, &one); // GetPlayerSteamLevel
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set<friends>(0, &persona_name); // GetPersonaName
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set<friends>(2, &one); // GetPersonaState: online
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for (const auto slot : {4, 19, 25, 39, 41, 51, 57}) set<friends>(slot, &zero_steam_id);
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for (const auto slot : {7, 9, 14, 20, 21, 45, 47, 78}) set<friends>(slot, &empty_string);
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set<friends>(43, &one); // SetRichPresence
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set<utils>(2, &one); // GetConnectedUniverse: public
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set<utils>(3, &server_time); // GetServerRealTime
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set<utils>(4, &country); // GetIPCountry
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set<utils>(8, &battery); // GetCurrentBatteryPower: AC
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set<utils>(9, &app); // GetAppID
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set<utils>(23, &language); // GetSteamUILanguage
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for (const auto slot : {12, 18, 35}) set<matchmaking>(slot, &zero_steam_id);
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for (const auto slot : {19, 24}) set<matchmaking>(slot, &empty_string);
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set<apps>(0, &one); // BIsSubscribed
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set<apps>(4, &language); // GetCurrentGameLanguage
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set<apps>(5, &language_list); // GetAvailableGameLanguages
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set<apps>(6, &one); // BIsSubscribedApp
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set<apps>(19, &one); // BIsAppInstalled
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set<apps>(20, &user_steam_id); // GetAppOwner
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set<apps>(21, &empty_string); // GetLaunchQueryParam
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for (const auto slot : {12, 15, 24}) set<user_stats>(slot, &empty_string); // achievement/leaderboard names
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set<remote_storage>(19, &empty_string); // GetFileNameAndSize
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set<remote_play>(2, &zero_steam_id); // GetSessionSteamID
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set<remote_play>(3, &empty_string); // GetSessionClientName
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set<networking_utils>(12, &local_timestamp); // GetLocalTimestamp
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set<networking_utils>(33, &one); // SetConfigValue
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const auto bind = [](int interface, std::array<void*, slot_count>& vtable) {
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objects[interface].vtable = vtable.data();
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};
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bind(user, table<user>); bind(friends, table<friends>); bind(utils, table<utils>);
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bind(matchmaking, table<matchmaking>); bind(matchmaking_servers, table<matchmaking_servers>);
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bind(networking, table<networking>); bind(networking_messages, table<networking_messages>);
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bind(networking_sockets, table<networking_sockets>); bind(networking_utils, table<networking_utils>);
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bind(input, table<input>); bind(controller, table<controller>); bind(parties, table<parties>);
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bind(game_search, table<game_search>); bind(apps, table<apps>);
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bind(user_stats, table<user_stats>); bind(remote_storage, table<remote_storage>);
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bind(remote_play, table<remote_play>); bind(unknown, table<unknown>);
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}
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Interface classify(std::string_view version) noexcept {
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// Longest names first: prefixes overlap (SteamNetworking...).
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constexpr std::array<std::pair<std::string_view, Interface>, 17> names{{
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{"STEAMAPPS_INTERFACE_VERSION", apps}, {"STEAMUSERSTATS_INTERFACE_VERSION", user_stats},
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{"STEAMREMOTESTORAGE_INTERFACE_VERSION", remote_storage},
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{"STEAMREMOTEPLAY_INTERFACE_VERSION", remote_play},
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{"SteamMatchMakingServers", matchmaking_servers}, {"SteamMatchGameSearch", game_search},
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{"SteamMatchMaking", matchmaking}, {"SteamNetworkingMessages", networking_messages},
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{"SteamNetworkingSockets", networking_sockets}, {"SteamNetworkingUtils", networking_utils},
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{"SteamNetworking", networking}, {"SteamUser", user}, {"SteamFriends", friends},
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{"SteamUtils", utils}, {"SteamInput", input}, {"SteamController", controller},
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{"SteamParties", parties}}};
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for (const auto& [name, interface] : names) if (version.starts_with(name)) return interface;
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return unknown;
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}
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// ---------------------------------------------------------------- flat API
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void* __cdecl find_or_create_user_interface(std::int32_t, const char* version) {
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const auto interface = classify(version ? version : "");
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if (interface == unknown) {
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try {
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logging::log(logging::Level::info, logging::Channel::network,
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"Offline Steam: generic stand-in for {}", version ? version : "(null)");
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} catch (...) {}
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}
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return &objects[interface];
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}
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void* __cdecl find_or_create_game_server_interface(std::int32_t, const char*) { return nullptr; }
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// Steamworks' per-interface accessor cache: {init function, counter, pointer}.
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void* __cdecl context_init(void* data) {
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auto* context = static_cast<void**>(data);
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if (!context) return nullptr;
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if (reinterpret_cast<std::uintptr_t>(context[1]) != 1) {
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reinterpret_cast<void (*)(void*)>(context[0])(&context[2]);
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context[1] = reinterpret_cast<void*>(std::uintptr_t{1});
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}
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return &context[2];
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}
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int __cdecl internal_init(const char*, char* error) {
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if (error) error[0] = '\0';
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return 0; // k_ESteamAPIInitResult_OK
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}
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bool __cdecl init_ok() { return true; }
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void __cdecl shutdown() {}
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std::int32_t __cdecl handle() { return 1; }
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const char* __cdecl install_path() { return empty; }
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void __cdecl release_thread_memory() {}
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void detour(HMODULE module, const char* name, void* replacement) {
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const auto target = reinterpret_cast<void*>(GetProcAddress(module, name));
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if (!target) return;
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const auto create = hook_prepare(target, replacement, nullptr);
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if (create != HookOk)
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throw std::runtime_error(std::string("Cannot hook ") + name + ": " + hook_status_string(create));
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const auto enable = hook_enable(target);
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if (enable != HookOk)
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throw std::runtime_error(std::string("Cannot enable ") + name + ": " + hook_status_string(enable));
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}
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} // namespace
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std::uint64_t steam_id() noexcept { return launcher::offline_steam_id(); }
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bool install(HMODULE steam, std::string& error) noexcept {
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try {
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build_objects();
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#pragma warning(push)
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#pragma warning(disable: 4191)
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const std::pair<const char*, void*> replacements[]{
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{"SteamInternal_SteamAPI_Init", reinterpret_cast<void*>(&internal_init)},
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{"SteamAPI_Init", reinterpret_cast<void*>(&init_ok)},
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{"SteamAPI_InitSafe", reinterpret_cast<void*>(&init_ok)},
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{"SteamAPI_IsSteamRunning", reinterpret_cast<void*>(&init_ok)},
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{"SteamAPI_Shutdown", reinterpret_cast<void*>(&shutdown)},
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{"SteamAPI_GetHSteamUser", reinterpret_cast<void*>(&handle)},
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{"SteamAPI_GetHSteamPipe", reinterpret_cast<void*>(&handle)},
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{"SteamAPI_GetSteamInstallPath", reinterpret_cast<void*>(&install_path)},
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{"SteamAPI_ReleaseCurrentThreadMemory", reinterpret_cast<void*>(&release_thread_memory)},
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{"SteamAPI_RunCallbacks", reinterpret_cast<void*>(&run_callbacks)},
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{"SteamAPI_RegisterCallback", reinterpret_cast<void*>(®ister_callback)},
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{"SteamAPI_UnregisterCallback", reinterpret_cast<void*>(&unregister_callback)},
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{"SteamAPI_RegisterCallResult", reinterpret_cast<void*>(®ister_call_result)},
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{"SteamAPI_UnregisterCallResult", reinterpret_cast<void*>(&unregister_call_result)},
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{"SteamInternal_ContextInit", reinterpret_cast<void*>(&context_init)},
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{"SteamInternal_FindOrCreateUserInterface", reinterpret_cast<void*>(&find_or_create_user_interface)},
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{"SteamInternal_FindOrCreateGameServerInterface", reinterpret_cast<void*>(&find_or_create_game_server_interface)},
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};
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#pragma warning(pop)
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for (const auto& [name, replacement] : replacements) detour(steam, name, replacement);
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error = "offline, SteamID " + std::to_string(steam_id());
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return true;
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} catch (const std::exception& exception) {
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error = exception.what();
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return false;
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}
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}
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} // namespace dingosdk::offline_steam
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