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Rework bootstrapper a bit
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@Meivyn
Meivyn committed Sep 11, 2023
1 parent 7dc39c0 commit 0550637
Showing 1 changed file with 103 additions and 114 deletions.
217 changes: 103 additions & 114 deletions IPA.Injector/Injector.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -142,9 +142,9 @@ private static void InstallBootstrapPatch()
var sw = Stopwatch.StartNew();

var cAsmName = Assembly.GetExecutingAssembly().GetName();
var managedPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
var managedPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location)!;

var dataDir = new DirectoryInfo(managedPath).Parent.Name;
var dataDir = new DirectoryInfo(managedPath).Parent!.Name;
var gameName = dataDir.Substring(0, dataDir.Length - 5);

Logging.Logger.Injector.Debug("Finding backup");
Expand All @@ -153,152 +153,141 @@ private static void InstallBootstrapPatch()
if (bkp == null)
Logging.Logger.Injector.Warn("No backup found! Was BSIPA installed using the installer?");

// TODO: Investigate if this ever worked properly.
// this is a critical section because if you exit in here, assembly can die
using var critSec = CriticalSection.ExecuteSection();

var readerParameters = new ReaderParameters
{
ReadWrite = false,
InMemory = true,
ReadingMode = ReadingMode.Immediate
};

Logging.Logger.Injector.Debug("Ensuring patch on UnityEngine.CoreModule exists");

#region Insert patch into UnityEngine.CoreModule.dll

{
var unityPath = Path.Combine(managedPath,
"UnityEngine.CoreModule.dll");
var unityPath = Path.Combine(managedPath, "UnityEngine.CoreModule.dll");

// this is a critical section because if you exit in here, CoreModule can die
using var critSec = CriticalSection.ExecuteSection();
using var unityAsmDef = AssemblyDefinition.ReadAssembly(unityPath, readerParameters);
var unityModDef = unityAsmDef.MainModule;

using var unityAsmDef = AssemblyDefinition.ReadAssembly(unityPath, new ReaderParameters
{
ReadWrite = false,
InMemory = true,
ReadingMode = ReadingMode.Immediate
});
var unityModDef = unityAsmDef.MainModule;

bool modified = false;
foreach (var asmref in unityModDef.AssemblyReferences)
bool modified = false;
foreach (var asmref in unityModDef.AssemblyReferences)
{
if (asmref.Name == cAsmName.Name)
{
if (asmref.Name == cAsmName.Name)
if (asmref.Version != cAsmName.Version)
{
if (asmref.Version != cAsmName.Version)
{
asmref.Version = cAsmName.Version;
modified = true;
}
asmref.Version = cAsmName.Version;
modified = true;
}
}
}

var application = unityModDef.GetType("UnityEngine", "Camera");
var application = unityModDef.GetType("UnityEngine", "Camera");

if (application == null)
{
Logging.Logger.Injector.Critical("UnityEngine.CoreModule doesn't have a definition for UnityEngine.Camera!"
+ "Nothing to patch to get ourselves into the Unity run cycle!");
goto endPatchCoreModule;
}
if (application == null)
{
Logging.Logger.Injector.Critical("UnityEngine.CoreModule doesn't have a definition for UnityEngine.Camera!"
+ "Nothing to patch to get ourselves into the Unity run cycle!");
goto endPatchCoreModule;
}

MethodDefinition? cctor = null;
foreach (var m in application.Methods)
if (m.IsRuntimeSpecialName && m.Name == ".cctor")
cctor = m;
MethodDefinition? cctor = null;
foreach (var m in application.Methods)
if (m.IsRuntimeSpecialName && m.Name == ".cctor")
cctor = m;

var cbs = unityModDef.ImportReference(((Action)CreateBootstrapper).Method);
var cbs = unityModDef.ImportReference(((Action)CreateBootstrapper).Method);

if (cctor == null)
{
cctor = new MethodDefinition(".cctor",
MethodAttributes.RTSpecialName | MethodAttributes.Static | MethodAttributes.SpecialName,
unityModDef.TypeSystem.Void);
application.Methods.Add(cctor);
modified = true;

var ilp = cctor.Body.GetILProcessor();
ilp.Emit(OpCodes.Call, cbs);
ilp.Emit(OpCodes.Ret);
}
else
if (cctor == null)
{
cctor = new MethodDefinition(".cctor",
MethodAttributes.RTSpecialName | MethodAttributes.Static | MethodAttributes.SpecialName,
unityModDef.TypeSystem.Void);
application.Methods.Add(cctor);
modified = true;

var ilp = cctor.Body.GetILProcessor();
ilp.Emit(OpCodes.Call, cbs);
ilp.Emit(OpCodes.Ret);
}
else
{
var ilp = cctor.Body.GetILProcessor();
for (var i = 0; i < Math.Min(2, cctor.Body.Instructions.Count); i++)
{
var ilp = cctor.Body.GetILProcessor();
for (var i = 0; i < Math.Min(2, cctor.Body.Instructions.Count); i++)
var ins = cctor.Body.Instructions[i];
switch (i)
{
var ins = cctor.Body.Instructions[i];
switch (i)
{
case 0 when ins.OpCode != OpCodes.Call:
ilp.Replace(ins, ilp.Create(OpCodes.Call, cbs));
modified = true;
break;
case 0 when ins.OpCode != OpCodes.Call:
ilp.Replace(ins, ilp.Create(OpCodes.Call, cbs));
modified = true;
break;

case 0:
case 0:
{
var methodRef = ins.Operand as MethodReference;
if (methodRef?.FullName != cbs.FullName)
{
var methodRef = ins.Operand as MethodReference;
if (methodRef?.FullName != cbs.FullName)
{
ilp.Replace(ins, ilp.Create(OpCodes.Call, cbs));
modified = true;
}

break;
ilp.Replace(ins, ilp.Create(OpCodes.Call, cbs));
modified = true;
}
case 1 when ins.OpCode != OpCodes.Ret:
ilp.Replace(ins, ilp.Create(OpCodes.Ret));
modified = true;

break;
}
}
case 1 when ins.OpCode != OpCodes.Ret:
ilp.Replace(ins, ilp.Create(OpCodes.Ret));
modified = true;
break;
}
}
}

if (modified)
{
string tempFilePath = Path.GetTempFileName();
bkp?.Add(unityPath);
unityAsmDef.Write(tempFilePath);
File.Delete(unityPath);
File.Move(tempFilePath, unityPath);
}
if (modified)
{
string tempFilePath = Path.GetTempFileName();
bkp?.Add(unityPath);
unityAsmDef.Write(tempFilePath);
File.Delete(unityPath);
File.Move(tempFilePath, unityPath);
}
endPatchCoreModule:
#endregion Insert patch into UnityEngine.CoreModule.dll

bool isFirst = true;
foreach (var name in SelfConfig.GameAssemblies_)
#if BeatSaber
Logging.Logger.Injector.Debug("Ensuring anti-yeet patch exists");

var name = SelfConfig.GameAssemblies_.FirstOrDefault() ?? SelfConfig.GetDefaultGameAssemblies().First();
var ascPath = Path.Combine(managedPath, name);

try
{
var ascPath = Path.Combine(managedPath, name);
using var ascAsmDef = AssemblyDefinition.ReadAssembly(ascPath, readerParameters);
var ascModDef = ascAsmDef.MainModule;

using var execSec = CriticalSection.ExecuteSection();
var deleter = ascModDef.GetType("IPAPluginsDirDeleter");

#if BeatSaber
if (isFirst)
if (deleter.Methods.Count > 0)
{
try
{
Logging.Logger.Injector.Debug("Applying anti-yeet patch");

using var ascAsmDef = AssemblyDefinition.ReadAssembly(ascPath, new ReaderParameters
{
ReadWrite = false,
InMemory = true,
ReadingMode = ReadingMode.Immediate
});
var ascModDef = ascAsmDef.MainModule;

var deleter = ascModDef.GetType("IPAPluginsDirDeleter");
deleter.Methods.Clear(); // delete all methods

string tempFilePath = Path.GetTempFileName();
bkp?.Add(ascPath);
ascAsmDef.Write(tempFilePath);
File.Delete(ascPath);
File.Move(tempFilePath, ascPath);

isFirst = false;
}
catch (Exception e)
{
Logging.Logger.Injector.Warn($"Could not apply anti-yeet patch to {ascPath}");
if (SelfConfig.Debug_.ShowHandledErrorStackTraces_)
Logging.Logger.Injector.Warn(e);
}
deleter.Methods.Clear(); // delete all methods

string tempFilePath = Path.GetTempFileName();
bkp?.Add(ascPath);
ascAsmDef.Write(tempFilePath);
File.Delete(ascPath);
File.Move(tempFilePath, ascPath);
}
#endif
}
catch (Exception e)
{
Logging.Logger.Injector.Warn($"Could not apply anti-yeet patch to {ascPath}");
if (SelfConfig.Debug_.ShowHandledErrorStackTraces_)
Logging.Logger.Injector.Warn(e);
}
#endif

sw.Stop();
Logging.Logger.Injector.Info($"Installing bootstrapper took {sw.Elapsed}");
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