mirror of
https://github.com/djdevin/recnet-plugin.git
synced 2026-09-08 06:31:29 -07:00
Devin Zuczek
79 lines
4.2 KiB
C
79 lines
4.2 KiB
C
#include "common.h"
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//
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// DXGIDisplays.dll proxy -- loader vector for the recflare-client-unstable build.
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//
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// This build hardens against app-dir DLL planting: RecRoom.exe.dll pre-loads the real System32 crypto
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// DLLs (wintrust/bcrypt/crypt32) by full path, so none of those static-import proxies ever win (all
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// three were observed loading from C:\Windows\System32). What the loader CANNOT redirect to System32 is
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// a Rec Room first-party Unity plugin: UnityPlayer LoadLibrary's DXGIDisplays.dll from
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// RecRoom_Data\Plugins\x86_64 by that path, so replacing the file there is a legitimate in-process load
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// of our code -- no injection, no foreign thread. DXGIDisplays is enumerated during display/screen-mode
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// setup at engine startup (early and unconditional, well before the RecNet connection at ~5 s), which
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// is exactly when we need to be resident. (RRTexture.dll loads too late -- only on the first texture-
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// compression call, gated behind server content the client never fetches.)
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//
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// Its 15 exports are forwarded to DXGIDisplays_orig.dll (a copy of the genuine plugin, deployed
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// alongside us in the same Plugins dir; different basename, so no loop). DllMain (dllmain.c) starts the
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// hook thread -- the full redirector runs unchanged from here.
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//
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// Deploy: rename the real Plugins\x86_64\DXGIDisplays.dll -> DXGIDisplays_orig.dll, drop this in place.
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//
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// The exports all take <=4 args and are pure passthrough (the game calls them for real display data),
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// so a generic 4-pointer thunk forwards them faithfully: on x64 the first four args are RCX/RDX/R8/R9
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// and the return is RAX. We never inspect the args.
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//
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static volatile HMODULE g_real;
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// Load (once) the genuine plugin, renamed DXGIDisplays_orig.dll, from THIS module's own directory
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// (Plugins\x86_64) by full path so the plugin search can't loop back into us.
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static HMODULE RealDxgi(void)
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{
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HMODULE h = g_real;
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if (h) return h;
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wchar_t path[MAX_PATH];
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HMODULE self = NULL;
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GetModuleHandleExW(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS |
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GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
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(LPCWSTR)&RealDxgi, &self);
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DWORD n = GetModuleFileNameW(self, path, MAX_PATH);
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if (n == 0 || n >= MAX_PATH) return NULL;
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for (DWORD i = n; i > 0; i--) { if (path[i-1] == L'\\') { path[i] = 0; break; } }
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lstrcatW(path, L"DXGIDisplays_orig.dll");
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HMODULE loaded = LoadLibraryW(path);
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HMODULE prev = (HMODULE)InterlockedCompareExchangePointer((volatile PVOID *)&g_real, loaded, NULL);
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if (prev) { if (loaded) FreeLibrary(loaded); return prev; }
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return loaded;
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}
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typedef void *(*gen_t)(void *, void *, void *, void *);
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static gen_t P(const char *name) { HMODULE h = RealDxgi(); return h ? (gen_t)GetProcAddress(h, name) : NULL; }
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#define FWD(NAME) \
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void *my_##NAME(void *a, void *b, void *c, void *d) { \
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static gen_t fn; if (!fn) fn = P(#NAME); return fn ? fn(a,b,c,d) : NULL; }
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FWD(Finalize) FWD(GetDisplayBottom) FWD(GetDisplayCount) FWD(GetDisplayDpiX) FWD(GetDisplayDpiY)
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FWD(GetDisplayHeight) FWD(GetDisplayLeft) FWD(GetDisplayRight) FWD(GetDisplayRotation)
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FWD(GetDisplayTop) FWD(GetDisplayWidth) FWD(Initialize) FWD(IsDisplayPrimary) FWD(IsInitialized)
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FWD(LinkUnityDebugCallback)
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#pragma comment(linker, "/export:Finalize=my_Finalize")
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#pragma comment(linker, "/export:GetDisplayBottom=my_GetDisplayBottom")
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#pragma comment(linker, "/export:GetDisplayCount=my_GetDisplayCount")
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#pragma comment(linker, "/export:GetDisplayDpiX=my_GetDisplayDpiX")
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#pragma comment(linker, "/export:GetDisplayDpiY=my_GetDisplayDpiY")
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#pragma comment(linker, "/export:GetDisplayHeight=my_GetDisplayHeight")
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#pragma comment(linker, "/export:GetDisplayLeft=my_GetDisplayLeft")
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#pragma comment(linker, "/export:GetDisplayRight=my_GetDisplayRight")
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#pragma comment(linker, "/export:GetDisplayRotation=my_GetDisplayRotation")
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#pragma comment(linker, "/export:GetDisplayTop=my_GetDisplayTop")
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#pragma comment(linker, "/export:GetDisplayWidth=my_GetDisplayWidth")
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#pragma comment(linker, "/export:Initialize=my_Initialize")
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#pragma comment(linker, "/export:IsDisplayPrimary=my_IsDisplayPrimary")
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#pragma comment(linker, "/export:IsInitialized=my_IsInitialized")
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#pragma comment(linker, "/export:LinkUnityDebugCallback=my_LinkUnityDebugCallback")
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