Formatting

it has weird build issues on my machine, so I turned it off.

board/sg-cmd.h

@@ -25,6 +25,13 @@ struct sg_res_header {
     uint8_t payload_len;
 };
 
+/* struct to save the version string with its length
+   to fix NUL terminator issues */
+struct version_info {
+    const char *version;
+    uint8_t length;
+};
+
 typedef HRESULT (*sg_dispatch_fn_t)(
         void *ctx,
         const void *req,

board/sg-led.c

@@ -27,11 +27,11 @@ static HRESULT sg_led_cmd_set_color(
         const struct sg_led *led,
         const struct sg_led_req_set_color *req);
 
-const char *sg_led_info[] = {
-    "15084\xFF\x10\x00\x12",
-    "000-00000\xFF\x11\x40",
+static const struct version_info led_version[] = {
+    {"15084\xFF\x10\x00\x12", 9},
+    {"000-00000\xFF\x11\x40", 12},
     // maybe the same?
-    "000-00000\xFF\x11\x40"
+    {"000-00000\xFF\x11\x40", 12}
 };
 
 void sg_led_init(
@@ -156,10 +156,10 @@ static HRESULT sg_led_cmd_get_info(
 {
     sg_led_dprintf(led, "Get info\n");
 
-    unsigned int len = strlen(sg_led_info[led->gen - 1]);
+    const struct version_info *fw = &led_version[led->gen - 1];
 
-    sg_res_init(&res->res, req, len);
-    memcpy(res->payload, sg_led_info[led->gen - 1], len);
+    sg_res_init(&res->res, req, fw->length);
+    memcpy(res->payload, fw->version, fw->length);
 
     return S_OK;
 }

board/sg-nfc.c

@@ -65,16 +65,16 @@ static HRESULT sg_nfc_cmd_dummy(
         const struct sg_req_header *req,
         struct sg_res_header *res);
 
-static const char *hw_version[] = {
-    "TN32MSEC003S H/W Ver3.0",
-    "837-15286",
-    "837-15396"
+static const struct version_info hw_version[] = {
+    {"TN32MSEC003S H/W Ver3.0", 23},
+    {"837-15286", 9},
+    {"837-15396", 9}
 };
 
-static const char *fw_version[] = {
-    "TN32MSEC003S F/W Ver1.2",
-    "\x94",
-    "\x94"
+static const struct version_info fw_version[] = {
+    {"TN32MSEC003S F/W Ver1.2", 23},
+    {"\x94", 1},
+    {"\x94", 1}
 };
 
 void sg_nfc_init(
@@ -217,11 +217,11 @@ static HRESULT sg_nfc_cmd_get_fw_version(
         const struct sg_req_header *req,
         struct sg_nfc_res_get_fw_version *res)
 {
-    unsigned int len = strlen(fw_version[nfc->gen - 1]);
+    const struct version_info *fw = &fw_version[nfc->gen - 1];
 
     /* Dest version is not NUL terminated, this is intentional */
-    sg_res_init(&res->res, req, len);
-    memcpy(res->version, fw_version[nfc->gen - 1], len);
+    sg_res_init(&res->res, req, fw->length);
+    memcpy(res->version, fw->version, fw->length);
 
     return S_OK;
 }
@@ -231,11 +231,11 @@ static HRESULT sg_nfc_cmd_get_hw_version(
         const struct sg_req_header *req,
         struct sg_nfc_res_get_hw_version *res)
 {
-    unsigned int len = strlen(hw_version[nfc->gen - 1]);
+    const struct version_info *hw = &hw_version[nfc->gen - 1];
 
     /* Dest version is not NUL terminated, this is intentional */
-    sg_res_init(&res->res, req, len);
-    memcpy(res->version, hw_version[nfc->gen - 1], len);
+    sg_res_init(&res->res, req, hw->length);
+    memcpy(res->version, hw->version, hw->length);
 
     return S_OK;
 }

cmhook/config.c

@@ -40,4 +40,5 @@ void cm_hook_config_load(
     vfd_config_load(&cfg->vfd, filename);
     touch_screen_config_load(&cfg->touch, filename);
     cm_dll_config_load(&cfg->dll, filename);
+    unity_config_load(&cfg->unity, filename);
 }

cmhook/config.h

@@ -11,6 +11,8 @@
 
 #include "platform/config.h"
 
+#include "unityhook/config.h"
+
 struct cm_hook_config {
     struct platform_config platform;
     struct aime_config aime;
@@ -19,6 +21,7 @@ struct cm_hook_config {
     struct vfd_config vfd;
     struct cm_dll_config dll;
     struct touch_screen_config touch;
+    struct unity_config unity;
 };
 
 void cm_dll_config_load(

cmhook/dllmain.c

@@ -16,10 +16,11 @@
 #include "cmhook/config.h"
 #include "cmhook/io4.h"
 #include "cmhook/cm-dll.h"
-#include "cmhook/unity.h"
 
 #include "platform/platform.h"
 
+#include "unityhook/hook.h"
+
 #include "util/dprintf.h"
 
 static HMODULE cm_hook_mod;
@@ -83,7 +84,7 @@ static DWORD CALLBACK cm_pre_startup(void)
        There seems to be an issue with other DLL hooks if `LoadLibraryW` is
        hooked earlier in the `cmhook` initialization. */
 
-    unity_hook_init();
+    unity_hook_init(&cm_hook_cfg.unity, cm_hook_mod);
 
     /* Initialize debug helpers */
 

cmhook/meson.build

@@ -16,6 +16,7 @@ shared_library(
         hooklib_lib,
         cmio_lib,
         platform_lib,
+        unityhook_lib,
         util_lib,
     ],
     sources : [
@@ -26,7 +27,5 @@ shared_library(
         'io4.h',
         'cm-dll.c',
         'cm-dll.h',
-        'unity.h',
-        'unity.c',
     ],
 )

cmhook/unity.c

@@ -1,95 +0,0 @@
-#include <stdbool.h>
-
-#include <windows.h>
-
-#include "hook/table.h"
-
-#include "hooklib/dll.h"
-#include "hooklib/path.h"
-
-#include "util/dprintf.h"
-
-static void dll_hook_insert_hooks(HMODULE target);
-
-static HMODULE WINAPI my_LoadLibraryW(const wchar_t *name);
-static HMODULE (WINAPI *next_LoadLibraryW)(const wchar_t *name);
-
-static const struct hook_symbol unity_kernel32_syms[] = {
-    {
-        .name = "LoadLibraryW",
-        .patch = my_LoadLibraryW,
-        .link = (void **) &next_LoadLibraryW,
-    },
-};
-
-static const wchar_t *target_modules[] = {
-    L"mono.dll",
-    L"cri_ware_unity.dll",
-};
-static const size_t target_modules_len = _countof(target_modules);
-
-void unity_hook_init(void)
-{
-    dll_hook_insert_hooks(NULL);
-}
-
-static void dll_hook_insert_hooks(HMODULE target)
-{
-    hook_table_apply(
-            target,
-            "kernel32.dll",
-            unity_kernel32_syms,
-            _countof(unity_kernel32_syms));
-}
-
-static HMODULE WINAPI my_LoadLibraryW(const wchar_t *name)
-{
-    const wchar_t *name_end;
-    const wchar_t *target_module;
-    bool already_loaded;
-    HMODULE result;
-    size_t name_len;
-    size_t target_module_len;
-
-    if (name == NULL) {
-        SetLastError(ERROR_INVALID_PARAMETER);
-
-        return NULL;
-    }
-
-    // Check if the module is already loaded
-    already_loaded = GetModuleHandleW(name) != NULL;
-
-    // Must call the next handler so the DLL reference count is incremented
-    result = next_LoadLibraryW(name);
-
-    if (!already_loaded && result != NULL) {
-        name_len = wcslen(name);
-
-        for (size_t i = 0; i < target_modules_len; i++) {
-            target_module = target_modules[i];
-            target_module_len = wcslen(target_module);
-
-            // Check if the newly loaded library is at least the length of
-            // the name of the target module
-            if (name_len < target_module_len) {
-                continue;
-            }
-
-            name_end = &name[name_len - target_module_len];
-
-            // Check if the name of the newly loaded library is one of the
-            // modules the path hooks should be injected into
-            if (_wcsicmp(name_end, target_module) != 0) {
-                continue;
-            }
-
-            dprintf("Unity: Loaded %S\n", target_module);
-
-            dll_hook_insert_hooks(result);
-            path_hook_insert_hooks(result);
-        }
-    }
-
-    return result;
-}

cmhook/unity.h

@@ -1,3 +0,0 @@
-#pragma once
-
-void unity_hook_init(void);

cxbhook/config.c

@@ -23,22 +23,32 @@ void cxb_dll_config_load(
         struct cxb_dll_config *cfg,
         const wchar_t *filename)
 {
+    assert(cfg != NULL);
+    assert(filename != NULL);
 
+    GetPrivateProfileStringW(
+            L"cxbio",
+            L"path",
+            L"",
+            cfg->path,
+            _countof(cfg->path),
+            filename);
 }
 
 void revio_config_load(struct revio_config *cfg, const wchar_t *filename)
 {
+    assert(cfg != NULL);
+    assert(filename != NULL);
 
-}
-
-void network_config_load(struct network_config *cfg, const wchar_t *filename)
-{
-
+    cfg->enable = GetPrivateProfileIntW(L"revio", L"enable", 1, filename);
 }
 
 void led_config_load(struct led_config *cfg, const wchar_t *filename)
 {
+    assert(cfg != NULL);
+    assert(filename != NULL);
 
+    cfg->enable = GetPrivateProfileIntW(L"led", L"enable", 1, filename);
 }
 
 void cxb_hook_config_load(
@@ -56,6 +66,5 @@ void cxb_hook_config_load(
     gfx_config_load(&cfg->gfx, filename);
     cxb_dll_config_load(&cfg->dll, filename);
     revio_config_load(&cfg->revio, filename);
-    network_config_load(&cfg->network, filename);
     led_config_load(&cfg->led, filename);
 }

cxbhook/config.h

@@ -10,7 +10,6 @@
 #include "cxbhook/cxb-dll.h"
 #include "cxbhook/revio.h"
 #include "cxbhook/led.h"
-#include "cxbhook/network.h"
 
 #include "gfxhook/gfx.h"
 
@@ -23,7 +22,6 @@ struct cxb_hook_config {
     struct gfx_config gfx;
     struct cxb_dll_config dll;
     struct revio_config revio;
-    struct network_config network;
     struct led_config led;
 };
 
@@ -32,7 +30,6 @@ void cxb_dll_config_load(
         const wchar_t *filename);
 
 void revio_config_load(struct revio_config *cfg, const wchar_t *filename);
-void network_config_load(struct network_config *cfg, const wchar_t *filename);
 void led_config_load(struct led_config *cfg, const wchar_t *filename);
 
 void cxb_hook_config_load(

cxbhook/dllmain.c

@@ -9,7 +9,6 @@
 #include "cxbhook/config.h"
 #include "cxbhook/revio.h"
 #include "cxbhook/led.h"
-#include "cxbhook/network.h"
 
 #include "cxbio/cxbio.h"
 
@@ -103,12 +102,6 @@ static DWORD CALLBACK cxb_pre_startup(void)
         goto fail;
     }
 
-    hr = network_hook_init(&cxb_hook_cfg.network);
-
-    if (FAILED(hr)) {
-        goto fail;
-    }
-
     hr = led_hook_init(&cxb_hook_cfg.led);
 
     if (FAILED(hr)) {

cxbhook/led.c

@@ -49,7 +49,13 @@ static struct hook_symbol lamp_syms[] = {
 
 HRESULT led_hook_init(struct led_config *cfg)
 {
-    dprintf("LED: Init\n");
+    assert(cfg != NULL);
+
+    if (!cfg->enable) {
+        return S_FALSE;
+    }
+    
+    dprintf("LED: Hook enabled.\n");
     return proc_addr_table_push("CommLamp.dll", lamp_syms, _countof(lamp_syms));
 }
 

cxbhook/meson.build

@@ -30,7 +30,5 @@ shared_library(
         'revio.h',
         'led.c',
         'led.h',
-        'network.c',
-        'network.h',
     ],
 )

cxbhook/network.c

@@ -1,13 +0,0 @@
-#include <windows.h>
-#include <stdbool.h>
-#include <stdint.h>
-
-#include "cxbhook/network.h"
-
-#include "util/dprintf.h"
-
-HRESULT network_hook_init(struct network_config *cfg)
-{
-    dprintf("Network: Init\n");
-    return S_OK;
-}

cxbhook/network.h

@@ -1,13 +0,0 @@
-#pragma once
-
-#include <windows.h>
-#include <stdbool.h>
-#include <stdint.h>
-
-struct network_config {
-    bool enable;
-    bool disable_ssl;
-    char title_server[PATH_MAX];
-};
-
-HRESULT network_hook_init(struct network_config *cfg);

cxbhook/revio.c

@@ -82,7 +82,13 @@ static struct hook_symbol revio_syms[] = {
 
 HRESULT revio_hook_init(struct revio_config *cfg)
 {
-    dprintf("Revio: Init\n");
+    assert(cfg != NULL);
+
+    if (!cfg->enable) {
+        return S_FALSE;
+    }
+
+    dprintf("Revio: Hook enabled.\n");
     return proc_addr_table_push("CommIo.dll", revio_syms, _countof(revio_syms));
 }
 

dist/cm/segatools.ini

@@ -68,6 +68,11 @@ dipsw1=0
 ; Enable/Disable WinTouch emulation
 enable=0
 
+[unity]
+; Path to a .NET DLL that should run before the game. Useful for loading
+; modding frameworks such as BepInEx.
+targetAssembly=
+
 ; -----------------------------------------------------------------------------
 ; Custom IO settings
 ; -----------------------------------------------------------------------------

dist/cxb/segatools.ini

@@ -110,7 +110,7 @@ path=
 
 [revio]
 ; Enable emulation of the rev IO board
-enabe=1
+enable=1
 ; Test button virtual-key code. Default is the F1 key.
 test=0x70
 ; Service button virtual-key code. Default is the F2 key.

dist/mai2/segatools.ini

@@ -83,6 +83,15 @@ path=
 ; Leave empty if you want to use Segatools built-in keyboard input.
 path=
 
+; -----------------------------------------------------------------------------
+; Misc. hook settings
+; -----------------------------------------------------------------------------
+
+[unity]
+; Path to a .NET DLL that should run before the game. Useful for loading
+; modding frameworks such as BepInEx.
+targetAssembly=
+
 ; -----------------------------------------------------------------------------
 ; Input settings
 ; -----------------------------------------------------------------------------

dist/mu3/segatools.ini

@@ -72,6 +72,11 @@ dipsw1=1
 [gfx]
 enable=1
 
+[unity]
+; Path to a .NET DLL that should run before the game. Useful for loading
+; modding frameworks such as BepInEx.
+targetAssembly=
+
 ; -----------------------------------------------------------------------------
 ; Custom IO settings
 ; -----------------------------------------------------------------------------

mai2hook/config.c

@@ -39,4 +39,5 @@ void mai2_hook_config_load(
     io4_config_load(&cfg->io4, filename);
     vfd_config_load(&cfg->vfd, filename);
     mai2_dll_config_load(&cfg->dll, filename);
+    unity_config_load(&cfg->unity, filename);
 }

mai2hook/config.h

@@ -10,6 +10,8 @@
 
 #include "platform/config.h"
 
+#include "unityhook/config.h"
+
 struct mai2_hook_config {
     struct platform_config platform;
     struct aime_config aime;
@@ -17,6 +19,7 @@ struct mai2_hook_config {
     struct io4_config io4;
     struct vfd_config vfd;
     struct mai2_dll_config dll;
+    struct unity_config unity;
 };
 
 void mai2_dll_config_load(

mai2hook/dllmain.c

@@ -12,10 +12,11 @@
 #include "mai2hook/config.h"
 #include "mai2hook/io4.h"
 #include "mai2hook/mai2-dll.h"
-#include "mai2hook/unity.h"
 
 #include "platform/platform.h"
 
+#include "unityhook/hook.h"
+
 #include "util/dprintf.h"
 
 static HMODULE mai2_hook_mod;
@@ -80,7 +81,7 @@ static DWORD CALLBACK mai2_pre_startup(void)
        There seems to be an issue with other DLL hooks if `LoadLibraryW` is
        hooked earlier in the `mai2hook` initialization. */
 
-    unity_hook_init();
+    unity_hook_init(&mai2_hook_cfg.unity, mai2_hook_mod);
 
     /* Initialize debug helpers */
 

mai2hook/meson.build

@@ -15,6 +15,7 @@ shared_library(
         hooklib_lib,
         mai2io_lib,
         platform_lib,
+        unityhook_lib,
         util_lib,
     ],
     sources : [
@@ -25,7 +26,5 @@ shared_library(
         'io4.h',
         'mai2-dll.c',
         'mai2-dll.h',
-        'unity.h',
-        'unity.c',
     ],
 )

mai2hook/unity.h

@@ -1,3 +0,0 @@
-#pragma once
-
-void unity_hook_init(void);

meson.build

@@ -42,6 +42,7 @@ shlwapi_lib = cc.find_library('shlwapi')
 dinput8_lib = cc.find_library('dinput8')
 dxguid_lib = cc.find_library('dxguid')
 xinput_lib = cc.find_library('xinput')
+pathcch_lib = cc.find_library('pathcch')
 
 inc = include_directories('.')
 capnhook = subproject('capnhook')
@@ -55,6 +56,7 @@ subdir('platform')
 subdir('util')
 
 subdir('gfxhook')
+subdir('unityhook')
 
 subdir('aimeio')
 subdir('chuniio')

mu3hook/config.c

@@ -42,4 +42,5 @@ void mu3_hook_config_load(
     gfx_config_load(&cfg->gfx, filename);
     vfd_config_load(&cfg->vfd, filename);
     mu3_dll_config_load(&cfg->dll, filename);
+    unity_config_load(&cfg->unity, filename);
 }

mu3hook/config.h

@@ -13,6 +13,8 @@
 
 #include "platform/config.h"
 
+#include "unityhook/config.h"
+
 struct mu3_hook_config {
     struct platform_config platform;
     struct aime_config aime;
@@ -22,6 +24,7 @@ struct mu3_hook_config {
     // struct led15093_config led15093;
     struct vfd_config vfd;
     struct mu3_dll_config dll;
+    struct unity_config unity;
 };
 
 void mu3_dll_config_load(

mu3hook/dllmain.c

@@ -2,7 +2,6 @@
 
 #include <stdlib.h>
 
-#include "board/io4.h"
 #include "board/sg-reader.h"
 #include "board/vfd.h"
 
@@ -20,10 +19,12 @@
 #include "mu3hook/config.h"
 #include "mu3hook/io4.h"
 #include "mu3hook/mu3-dll.h"
-#include "mu3hook/unity.h"
 
 #include "platform/platform.h"
 
+#include "unityhook/config.h"
+#include "unityhook/hook.h"
+
 #include "util/dprintf.h"
 
 static HMODULE mu3_hook_mod;
@@ -99,7 +100,7 @@ static DWORD CALLBACK mu3_pre_startup(void)
        There seems to be an issue with other DLL hooks if `LoadLibraryW` is
        hooked earlier in the `mu3hook` initialization. */
 
-    unity_hook_init();
+    unity_hook_init(&mu3_hook_cfg.unity, mu3_hook_mod);
 
     /* Initialize debug helpers */
 

mu3hook/meson.build

@@ -17,6 +17,7 @@ shared_library(
         hooklib_lib,
         mu3io_lib,
         platform_lib,
+        unityhook_lib,
         util_lib,
     ],
     sources : [
@@ -27,7 +28,5 @@ shared_library(
         'io4.h',
         'mu3-dll.c',
         'mu3-dll.h',
-        'unity.h',
-        'unity.c',
     ],
 )

mu3hook/unity.c

@@ -1,95 +0,0 @@
-#include <stdbool.h>
-
-#include <windows.h>
-
-#include "hook/table.h"
-
-#include "hooklib/dll.h"
-#include "hooklib/path.h"
-
-#include "util/dprintf.h"
-
-static void dll_hook_insert_hooks(HMODULE target);
-
-static HMODULE WINAPI my_LoadLibraryW(const wchar_t *name);
-static HMODULE (WINAPI *next_LoadLibraryW)(const wchar_t *name);
-
-static const struct hook_symbol unity_kernel32_syms[] = {
-    {
-        .name = "LoadLibraryW",
-        .patch = my_LoadLibraryW,
-        .link = (void **) &next_LoadLibraryW,
-    },
-};
-
-static const wchar_t *target_modules[] = {
-    L"mono.dll",
-    L"cri_ware_unity.dll",
-};
-static const size_t target_modules_len = _countof(target_modules);
-
-void unity_hook_init(void)
-{
-    dll_hook_insert_hooks(NULL);
-}
-
-static void dll_hook_insert_hooks(HMODULE target)
-{
-    hook_table_apply(
-            target,
-            "kernel32.dll",
-            unity_kernel32_syms,
-            _countof(unity_kernel32_syms));
-}
-
-static HMODULE WINAPI my_LoadLibraryW(const wchar_t *name)
-{
-    const wchar_t *name_end;
-    const wchar_t *target_module;
-    bool already_loaded;
-    HMODULE result;
-    size_t name_len;
-    size_t target_module_len;
-
-    if (name == NULL) {
-        SetLastError(ERROR_INVALID_PARAMETER);
-
-        return NULL;
-    }
-
-    // Check if the module is already loaded
-    already_loaded = GetModuleHandleW(name) != NULL;
-
-    // Must call the next handler so the DLL reference count is incremented
-    result = next_LoadLibraryW(name);
-
-    if (!already_loaded && result != NULL) {
-        name_len = wcslen(name);
-
-        for (size_t i = 0; i < target_modules_len; i++) {
-            target_module = target_modules[i];
-            target_module_len = wcslen(target_module);
-
-            // Check if the newly loaded library is at least the length of
-            // the name of the target module
-            if (name_len < target_module_len) {
-                continue;
-            }
-
-            name_end = &name[name_len - target_module_len];
-
-            // Check if the name of the newly loaded library is one of the
-            // modules the path hooks should be injected into
-            if (_wcsicmp(name_end, target_module) != 0) {
-                continue;
-            }
-
-            dprintf("Unity: Loaded %S\n", target_module);
-
-            dll_hook_insert_hooks(result);
-            path_hook_insert_hooks(result);
-        }
-    }
-
-    return result;
-}

mu3hook/unity.h

@@ -1,3 +0,0 @@
-#pragma once
-
-void unity_hook_init(void);

platform/dns.c

@@ -82,7 +82,7 @@ HRESULT dns_platform_hook_init(const struct dns_config *cfg)
         return hr;
     }
 
-    // croosbeats REV.
+    // crossbeats REV.
     hr = dns_hook_push(L"https://rev-ent.ac.capcom.jp:443", cfg->title);
 
     if (FAILED(hr)) {

unityhook/config.c

@@ -0,0 +1,14 @@
+#include "config.h"
+
+void unity_config_load(struct unity_config *cfg, const wchar_t *filename) {
+    cfg->enable = GetPrivateProfileIntW(L"unity", L"enable", 1, filename);
+
+    GetPrivateProfileStringW(
+        L"unity",
+        L"targetAssembly",
+        L"",
+        cfg->target_assembly,
+        _countof(cfg->target_assembly),
+        filename
+    );
+}

unityhook/config.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include <stdbool.h>
+
+#include <windows.h>
+
+struct unity_config {
+    bool enable;
+    wchar_t target_assembly[MAX_PATH];
+};
+
+void unity_config_load(struct unity_config *cfg, const wchar_t *filename);

unityhook/doorstop.c

@@ -0,0 +1,173 @@
+// A simplified version of NeighTools' UnityDoorstop, allowing mod loaders
+// like BepInEx to be loaded into Unity games.
+//
+// SPDX-License-Identifier: CC0
+// https://github.com/NeighTools/UnityDoorstop
+#include <stdbool.h>
+
+#include <pathcch.h>
+#include <psapi.h>
+
+#include "hooklib/procaddr.h"
+#include "util/dprintf.h"
+
+#include "doorstop.h"
+#include "mono.h"
+#include "util.h"
+
+static void * my_mono_jit_init_version(const char *root_domain_name, const char *runtime_version);
+void doorstop_invoke(void *domain);
+
+static char module_name[MAX_PATH];
+static bool doorstop_hook_initted;
+static struct unity_config unity_config;
+static struct hook_symbol unity_mono_syms[] = {
+{
+        .name = "mono_jit_init_version",
+        .patch = my_mono_jit_init_version,
+    }
+};
+
+void doorstop_mono_hook_init(const struct unity_config *cfg, HINSTANCE module) {
+    if (doorstop_hook_initted || cfg->target_assembly[0] == 0) {
+        return;
+    }
+
+    GetModuleBaseNameA(GetCurrentProcess(), module, module_name, MAX_PATH);
+
+    memcpy(&unity_config, cfg, sizeof(*cfg));
+    load_mono_functions(module);
+    proc_addr_table_push(module_name, unity_mono_syms, _countof(unity_mono_syms));
+
+    doorstop_hook_initted = true;
+}
+
+static void * my_mono_jit_init_version(const char *root_domain_name, const char *runtime_version) {
+    dprintf("Unity: Starting Mono domain \"%s\"\n", root_domain_name);
+
+    SetEnvironmentVariableW(L"DOORSTOP_DLL_SEARCH_DIRS", widen(mono_assembly_getrootdir()));
+
+    void* domain = mono_jit_init_version(root_domain_name, runtime_version);
+
+    doorstop_invoke(domain);
+    return domain;
+}
+
+void doorstop_invoke(void* domain) {
+    if (GetEnvironmentVariableW(L"DOORSTOP_INITIALIZED", NULL, 0) != 0) {
+        dprintf("Unity: Doorstop is already initialized.\n");
+        return;
+    }
+
+    SetEnvironmentVariableW(L"DOORSTOP_INITIALIZED", L"TRUE");
+
+    mono_thread_set_main(mono_thread_current());
+
+    if (mono_domain_set_config) {
+#define CONFIG_EXT L".config"
+
+        wchar_t exe_path[MAX_PATH];
+        size_t exe_path_len = GetModuleFileNameW(NULL, exe_path, MAX_PATH);
+        wchar_t *folder_name = wcsdup(exe_path);
+
+        PathCchRemoveFileSpec(folder_name, exe_path_len + 1);
+
+        char *exe_path_n = narrow(exe_path);
+        char *folder_name_n = narrow(folder_name);
+
+        dprintf("Unity: Setting config paths: base dir: %s; config path: %s\n", folder_name_n, exe_path_n);
+
+        mono_domain_set_config(domain, folder_name_n, exe_path_n);
+
+        free(folder_name);
+        free(exe_path_n);
+        free(folder_name_n);
+
+#undef CONFIG_EXT
+    }
+
+    SetEnvironmentVariableW(L"DOORSTOP_INVOKE_DLL_PATH", unity_config.target_assembly);
+
+    char *assembly_dir = mono_assembly_getrootdir();
+    dprintf("Unity: Assembly directory: %s\n", assembly_dir);
+
+    SetEnvironmentVariableA("DOORSTOP_MANAGED_FOLDER_DIR", assembly_dir);
+
+    wchar_t app_path[MAX_PATH];
+    GetModuleFileNameW(NULL, app_path, MAX_PATH);
+    SetEnvironmentVariableW(L"DOORSTOP_PROCESS_PATH", app_path);
+
+    char* dll_path = narrow(unity_config.target_assembly);
+
+    dprintf("Unity: Loading assembly: %s\n", dll_path);
+
+    void* assembly = mono_domain_assembly_open(domain, dll_path);
+
+    if (!assembly) {
+        dprintf("Unity: Failed to load assembly\n");
+        free(dll_path);
+        return;
+    }
+
+    void *image = mono_assembly_get_image(assembly);
+
+    if (!image) {
+        dprintf("Unity: Assembly image doesn't exist\n");
+        free(dll_path);
+        return;
+    }
+
+    void *desc = mono_method_desc_new("*:Main", FALSE);
+    void *method = mono_method_desc_search_in_image(desc, image);
+
+    if (!method) {
+        dprintf("Unity: Assembly does not have a valid entrypoint.\n");
+        free(dll_path);
+        return;
+    }
+
+    void *signature = mono_method_signature(method);
+    UINT32 params = mono_signature_get_param_count(signature);
+    void **args = NULL;
+
+    if (params == 1) {
+        // If there is a parameter, it's most likely a string[].
+        void *args_array = mono_array_new(domain, mono_get_string_class(), 0);
+        args = malloc(sizeof(void*) * 1);
+        args[0] = args_array;
+    }
+
+    dprintf("Unity: Invoking method %p\n", method);
+
+    void *exc = NULL;
+    mono_runtime_invoke(method, NULL, args, &exc);
+
+    if (exc) {
+        dprintf("Unity: Error invoking method!\n");
+
+        void *ex_class = mono_get_exception_class();
+        void *to_string_desc = mono_method_desc_new("*:ToString()", FALSE);
+        void* to_string_method = mono_method_desc_search_in_class(to_string_desc, ex_class);
+
+        mono_method_desc_free(to_string_desc);
+
+        if (to_string_method) {
+            void* real_to_string_method = mono_object_get_virtual_method(exc, to_string_method);
+            void* exc2 = NULL;
+            void* str = mono_runtime_invoke(real_to_string_method, exc, NULL, &exc2);
+
+            if (!exc2) {
+                char* exc_str = mono_string_to_utf8(str);
+                dprintf("Unity: Error message: %s\n", exc_str);
+            }
+        }
+    }
+
+    mono_method_desc_free(desc);
+    free(dll_path);
+
+    if (args) {
+        free(args);
+        args = NULL;
+    }
+}

unityhook/doorstop.h

@@ -0,0 +1,5 @@
+#pragma once
+
+#include "config.h"
+
+void doorstop_mono_hook_init(const struct unity_config *cfg, HINSTANCE module);

unityhook/hook.c

@@ -1,14 +1,23 @@
+#include <assert.h>
 #include <stdbool.h>
 
-#include <windows.h>
-
 #include "hook/table.h"
-
-#include "hooklib/dll.h"
 #include "hooklib/path.h"
-
 #include "util/dprintf.h"
 
+#include "doorstop.h"
+#include "hook.h"
+
+static bool unity_hook_initted;
+static struct unity_config unity_config;
+
+static const wchar_t *target_modules[] = {
+    L"mono.dll",
+    L"mono-2.0-bdwgc.dll",
+    L"cri_ware_unity.dll",
+};
+static const size_t target_modules_len = _countof(target_modules);
+
 static void dll_hook_insert_hooks(HMODULE target);
 
 static HMODULE WINAPI my_LoadLibraryW(const wchar_t *name);
@@ -22,19 +31,25 @@ static const struct hook_symbol unity_kernel32_syms[] = {
     },
 };
 
-static const wchar_t *target_modules[] = {
-    L"mono-2.0-bdwgc.dll",
-    L"cri_ware_unity.dll",
-};
-static const size_t target_modules_len = _countof(target_modules);
+void unity_hook_init(const struct unity_config *cfg, HINSTANCE self) {
+    assert(cfg != NULL);
 
-void unity_hook_init(void)
-{
+    if (!cfg->enable) {
+        return;
+    }
+
+    if (unity_hook_initted) {
+        return;
+    }
+
+    memcpy(&unity_config, cfg, sizeof(*cfg));
     dll_hook_insert_hooks(NULL);
+
+    unity_hook_initted = true;
+    dprintf("Unity: Hook enabled.\n");
 }
 
-static void dll_hook_insert_hooks(HMODULE target)
-{
+static void dll_hook_insert_hooks(HMODULE target) {
     hook_table_apply(
         target,
         "kernel32.dll",
@@ -42,8 +57,7 @@ static void dll_hook_insert_hooks(HMODULE target)
         _countof(unity_kernel32_syms));
 }
 
-static HMODULE WINAPI my_LoadLibraryW(const wchar_t *name)
-{
+static HMODULE WINAPI my_LoadLibraryW(const wchar_t *name) {
     const wchar_t *name_end;
     const wchar_t *target_module;
     bool already_loaded;
@@ -66,6 +80,11 @@ static HMODULE WINAPI my_LoadLibraryW(const wchar_t *name)
     if (!already_loaded && result != NULL) {
         name_len = wcslen(name);
 
+        // mono entrypoint for injecting target_assembly
+        if (GetProcAddress(result, "mono_jit_init_version")) {
+            doorstop_mono_hook_init(&unity_config, result);
+        }
+
         for (size_t i = 0; i < target_modules_len; i++) {
             target_module = target_modules[i];
             target_module_len = wcslen(target_module);

unityhook/hook.h

@@ -0,0 +1,7 @@
+#pragma once
+
+#include <windows.h>
+
+#include "config.h"
+
+void unity_hook_init(const struct unity_config *cfg, HINSTANCE self);

unityhook/meson.build

@@ -0,0 +1,20 @@
+unityhook_lib = static_library(
+    'unityhook',
+    include_directories: inc,
+    implicit_include_directories: false,
+    c_pch: '../precompiled.h',
+    dependencies: [
+        capnhook.get_variable('hook_dep'),
+        pathcch_lib
+    ],
+    sources: [
+        'mono.h',
+        'config.c',
+        'config.h',
+        'doorstop.c',
+        'doorstop.h',
+        'hook.c',
+        'hook.h',
+        'util.h'
+    ],
+)

unityhook/mono.h

@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: CC0
+// https://github.com/NeighTools/UnityDoorstop
+#pragma once
+
+#include <windows.h>
+
+// Here we define the pointers to some functions within mono.dll
+// Note to C learners: these are not signature definitions, but rather "variable"
+// definitions with the function pointer type.
+
+// Note: we use void* instead of the real intented structs defined in mono API
+// This way we don't need to include or define any of Mono's structs, which saves space
+// This, obviously, comes with a drawback of not being able to easily access the contents of the structs
+
+void * (*mono_thread_current)();
+void (*mono_thread_set_main)(void *);
+
+void *(*mono_jit_init_version)(const char *root_domain_name, const char *runtime_version);
+void *(*mono_domain_assembly_open)(void *domain, const char *name);
+void *(*mono_assembly_get_image)(void *assembly);
+void *(*mono_runtime_invoke)(void *method, void *obj, void **params, void **exc);
+
+void *(*mono_method_desc_new)(const char *name, int include_namespace);
+void* (*mono_method_desc_search_in_image)(void* desc, void* image);
+void *(*mono_method_desc_search_in_class)(void *desc, void *klass);
+void (*mono_method_desc_free)(void *desc);
+void *(*mono_method_signature)(void *method);
+UINT32 (*mono_signature_get_param_count)(void *sig);
+
+void (*mono_domain_set_config)(void *domain, char *base_dir, char *config_file_name);
+void *(*mono_array_new)(void *domain, void *eclass, uintptr_t n);
+void *(*mono_get_string_class)();
+
+char *(*mono_assembly_getrootdir)();
+
+// Additional funcs to bootstrap custom MONO
+void (*mono_set_dirs)(const char* assembly_dir, const char* config_dir);
+void (*mono_config_parse)(const char* filename);
+void (*mono_set_assemblies_path)(const char* path);
+void *(*mono_object_to_string)(void* obj, void** exc);
+char *(*mono_string_to_utf8)(void* s);
+
+void *(*mono_image_open_from_data_with_name)(void *data, DWORD data_len, int need_copy, void *status, int refonly,
+                                             const char *name);
+
+void* (*mono_get_exception_class)();
+void* (*mono_object_get_virtual_method)(void* obj_raw, void* method);
+
+void* (*mono_jit_parse_options)(int argc, const char** argv);
+
+typedef enum {
+    MONO_DEBUG_FORMAT_NONE,
+    MONO_DEBUG_FORMAT_MONO,
+    /* Deprecated, the mdb debugger is not longer supported. */
+    MONO_DEBUG_FORMAT_DEBUGGER
+} MonoDebugFormat;
+
+void* (*mono_debug_init)(MonoDebugFormat format);
+void* (*mono_debug_domain_create)(void* domain);
+
+/**
+* \brief Loads Mono C API function pointers so that the above definitions can be called.
+* \param mono_lib Mono.dll module.
+*/
+void load_mono_functions(HMODULE mono_lib) {
+    // Enjoy the fact that C allows such sloppy casting
+    // In C++ you would have to cast to the precise function pointer type
+#define GET_MONO_PROC(name) name = (void*)GetProcAddress(mono_lib, #name)
+
+    // Find and assign all our functions that we are going to use
+    GET_MONO_PROC(mono_domain_assembly_open);
+    GET_MONO_PROC(mono_assembly_get_image);
+    GET_MONO_PROC(mono_runtime_invoke);
+    GET_MONO_PROC(mono_jit_init_version);
+    GET_MONO_PROC(mono_method_desc_new);
+    GET_MONO_PROC(mono_method_desc_search_in_class);
+    GET_MONO_PROC(mono_method_desc_search_in_image);
+    GET_MONO_PROC(mono_method_desc_free);
+    GET_MONO_PROC(mono_method_signature);
+    GET_MONO_PROC(mono_signature_get_param_count);
+    GET_MONO_PROC(mono_array_new);
+    GET_MONO_PROC(mono_get_string_class);
+    GET_MONO_PROC(mono_assembly_getrootdir);
+    GET_MONO_PROC(mono_thread_current);
+    GET_MONO_PROC(mono_thread_set_main);
+    GET_MONO_PROC(mono_domain_set_config);
+    GET_MONO_PROC(mono_set_dirs);
+    GET_MONO_PROC(mono_config_parse);
+    GET_MONO_PROC(mono_set_assemblies_path);
+    GET_MONO_PROC(mono_object_to_string);
+    GET_MONO_PROC(mono_string_to_utf8);
+    GET_MONO_PROC(mono_image_open_from_data_with_name);
+    GET_MONO_PROC(mono_get_exception_class);
+    GET_MONO_PROC(mono_object_get_virtual_method);
+    GET_MONO_PROC(mono_jit_parse_options);
+    GET_MONO_PROC(mono_debug_init);
+    GET_MONO_PROC(mono_debug_domain_create);
+
+#undef GET_MONO_PROC
+}

unityhook/util.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <windows.h>
+
+wchar_t *widen(const char *str) {
+    const int reqsz = MultiByteToWideChar(CP_UTF8, 0, str, -1, NULL, 0);
+    wchar_t *result = malloc(reqsz * sizeof(wchar_t));
+
+    MultiByteToWideChar(CP_UTF8, 0, str, -1, result, reqsz);
+    return result;
+}
+
+char *narrow(const wchar_t *str) {
+    const int reqsz = WideCharToMultiByte(CP_UTF8, 0, str, -1, NULL, 0, NULL, NULL);
+    char *result = malloc(reqsz * sizeof(char));
+
+    WideCharToMultiByte(CP_UTF8, 0, str, -1, result, reqsz, NULL, NULL);
+    return result;
+}
+