feat: inject exception handler dll after EasyHook

Dalamud.Injector/NativeFunctions.cs

@@ -0,0 +1,123 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Runtime.ConstrainedExecution;
+using System.Runtime.InteropServices;
+using System.Security;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Dalamud.Injector
+{
+    static class NativeFunctions
+    {
+        // OpenProcess signture https://www.pinvoke.net/default.aspx/kernel32.openprocess
+        [Flags]
+        public enum ProcessAccessFlags : uint
+        {
+            All = 0x001F0FFF,
+            Terminate = 0x00000001,
+            CreateThread = 0x00000002,
+            VirtualMemoryOperation = 0x00000008,
+            VirtualMemoryRead = 0x00000010,
+            VirtualMemoryWrite = 0x00000020,
+            DuplicateHandle = 0x00000040,
+            CreateProcess = 0x000000080,
+            SetQuota = 0x00000100,
+            SetInformation = 0x00000200,
+            QueryInformation = 0x00000400,
+            QueryLimitedInformation = 0x00001000,
+            Synchronize = 0x00100000
+        }
+
+        [DllImport("kernel32.dll", SetLastError = true)]
+        public static extern IntPtr OpenProcess(
+        ProcessAccessFlags processAccess,
+        bool bInheritHandle,
+        int processId);
+        public static IntPtr OpenProcess(Process proc, ProcessAccessFlags flags)
+        {
+            return OpenProcess(flags, false, proc.Id);
+        }
+
+        // VirtualAllocEx signture https://www.pinvoke.net/default.aspx/kernel32.virtualallocex
+        [Flags]
+        public enum AllocationType
+        {
+            Commit = 0x1000,
+            Reserve = 0x2000,
+            Decommit = 0x4000,
+            Release = 0x8000,
+            Reset = 0x80000,
+            Physical = 0x400000,
+            TopDown = 0x100000,
+            WriteWatch = 0x200000,
+            LargePages = 0x20000000
+        }
+
+        // VirtualFreeEx signture  https://www.pinvoke.net/default.aspx/kernel32.virtualfreeex
+        [DllImport("kernel32.dll", SetLastError = true, ExactSpelling = true)]
+        public static extern bool VirtualFreeEx(IntPtr hProcess, IntPtr lpAddress,
+        int dwSize, AllocationType dwFreeType);
+
+        [Flags]
+        public enum MemoryProtection
+        {
+            Execute = 0x10,
+            ExecuteRead = 0x20,
+            ExecuteReadWrite = 0x40,
+            ExecuteWriteCopy = 0x80,
+            NoAccess = 0x01,
+            ReadOnly = 0x02,
+            ReadWrite = 0x04,
+            WriteCopy = 0x08,
+            GuardModifierflag = 0x100,
+            NoCacheModifierflag = 0x200,
+            WriteCombineModifierflag = 0x400
+        }
+
+        [DllImport("kernel32.dll", SetLastError = true, ExactSpelling = true)]
+        public static extern IntPtr VirtualAllocEx(
+            IntPtr hProcess,
+            IntPtr lpAddress,
+            int dwSize,
+            AllocationType flAllocationType,
+            MemoryProtection flProtect);
+
+        // WriteProcessMemory signture https://www.pinvoke.net/default.aspx/kernel32/WriteProcessMemory.html
+        [DllImport("kernel32.dll", SetLastError = true)]
+        public static extern bool WriteProcessMemory(
+        IntPtr hProcess,
+        IntPtr lpBaseAddress,
+        [MarshalAs(UnmanagedType.AsAny)] object lpBuffer,
+        int dwSize,
+        out IntPtr lpNumberOfBytesWritten);
+
+        // GetProcAddress signture https://www.pinvoke.net/default.aspx/kernel32.getprocaddress
+        [DllImport("kernel32", CharSet = CharSet.Ansi, ExactSpelling = true, SetLastError = true)]
+        public static extern IntPtr GetProcAddress(IntPtr hModule, string procName);
+
+        // GetModuleHandle signture http://pinvoke.net/default.aspx/kernel32.GetModuleHandle
+        [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
+        public static extern IntPtr GetModuleHandle(string lpModuleName);
+
+        // CreateRemoteThread signture https://www.pinvoke.net/default.aspx/kernel32.createremotethread
+        [DllImport("kernel32.dll")]
+        public static extern IntPtr CreateRemoteThread(
+        IntPtr hProcess,
+        IntPtr lpThreadAttributes,
+        uint dwStackSize,
+        IntPtr lpStartAddress,
+        IntPtr lpParameter,
+        uint dwCreationFlags,
+        IntPtr lpThreadId);
+
+        // CloseHandle signture https://www.pinvoke.net/default.aspx/kernel32.closehandle
+        [DllImport("kernel32.dll", SetLastError = true)]
+        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
+        [SuppressUnmanagedCodeSecurity]
+        [return: MarshalAs(UnmanagedType.Bool)]
+        public static extern bool CloseHandle(IntPtr hObject);
+    }
+}

Dalamud.Injector/Program.cs

@@ -1,8 +1,11 @@
 using System;
 using System.Collections.Generic;
+using System.ComponentModel;
 using System.Diagnostics;
+using System.Drawing;
 using System.IO;
 using System.Linq;
+using System.Runtime.InteropServices;
 using System.Text;
 using System.Threading;
 using System.Windows.Forms;
@@ -29,7 +32,7 @@ namespace Dalamud.Injector {
             };
 
 
-                var pid = -1;
+            var pid = -1;
             if (args.Length == 1) {
                 pid = int.Parse(args[0]);
             }
@@ -69,6 +72,9 @@ namespace Dalamud.Injector {
 
             // Inject to process
             Inject(process, startInfo);
+
+            // Inject exception handler
+            NativeInject(process);
         }
 
         private static void Inject(Process process, DalamudStartInfo info) {
@@ -86,6 +92,63 @@ namespace Dalamud.Injector {
             Console.WriteLine("Injected");
         }
 
+        private static void NativeInject(Process process) {
+            var libPath = Path.GetFullPath("DalamudDebugStub.dll");
+
+            var handle = NativeFunctions.OpenProcess(
+                NativeFunctions.ProcessAccessFlags.All,
+                false,
+                process.Id);
+
+            if (handle == IntPtr.Zero)
+                throw new Win32Exception(Marshal.GetLastWin32Error(), "Could not OpenProcess");
+
+            var dllMem = NativeFunctions.VirtualAllocEx(
+                handle,
+                IntPtr.Zero,
+                libPath.Length,
+                NativeFunctions.AllocationType.Reserve | NativeFunctions.AllocationType.Commit,
+                NativeFunctions.MemoryProtection.ExecuteReadWrite);
+
+            if (dllMem == IntPtr.Zero)
+                throw new Win32Exception(Marshal.GetLastWin32Error(), "Could not alloc memory");
+
+            var pathBytes = Encoding.ASCII.GetBytes(libPath);
+            if (!NativeFunctions.WriteProcessMemory(
+                    handle,
+                    dllMem,
+                    pathBytes,
+                    pathBytes.Length,
+                    out var bytesread
+                ))
+                throw new Win32Exception(Marshal.GetLastWin32Error(), "Could not write DLL");
+
+            var kernel32 = NativeFunctions.GetModuleHandle("Kernel32.dll");
+            var loadLibA = NativeFunctions.GetProcAddress(kernel32, "LoadLibraryA");
+
+            var remoteThread = NativeFunctions.CreateRemoteThread(
+                handle,
+                IntPtr.Zero,
+                0,
+                loadLibA,
+                dllMem,
+                0,
+                IntPtr.Zero
+            );
+
+            if (remoteThread == IntPtr.Zero)
+                throw new Win32Exception(Marshal.GetLastWin32Error(), "Could not alloc memory");
+
+            NativeFunctions.VirtualFreeEx(
+                handle,
+                dllMem,
+                0,
+                NativeFunctions.AllocationType.Release);
+
+            NativeFunctions.CloseHandle(remoteThread);
+            NativeFunctions.CloseHandle(handle);
+        }
+
         private static DalamudStartInfo GetDefaultStartInfo() {
             var ffxivDir = Path.GetDirectoryName(process.MainModule.FileName);
             var startInfo = new DalamudStartInfo {