util/clock.c: Add hook to prevent date/time changes

util/clock.c

@@ -0,0 +1,39 @@
+#include "hook/table.h"
+
+#include "util/dprintf.h"
+
+static BOOL WINAPI my_SetSystemTime(void *whatever);
+static BOOL WINAPI my_SetTimeZoneInformation(void *whatever);
+
+static const struct hook_symbol clock_hook_syms[] = {
+    {
+        .name   = "SetSystemTime",
+        .patch  = my_SetSystemTime,
+    }, {
+        .name   = "SetTimeZoneInformation",
+        .patch  = my_SetTimeZoneInformation,
+    }
+};
+
+void clock_hook_init(void)
+{
+    hook_table_apply(
+            NULL,
+            "kernel32.dll",
+            clock_hook_syms,
+            _countof(clock_hook_syms));
+}
+
+static BOOL WINAPI my_SetSystemTime(void *whatever)
+{
+    dprintf("Prevented application from screwing with the system clock\n");
+
+    return TRUE;
+}
+
+static BOOL WINAPI my_SetTimeZoneInformation(void *whatever)
+{
+    dprintf("Prevented application from screwing with the timezone\n");
+
+    return TRUE;
+}

util/clock.h

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

util/meson.build

@@ -7,6 +7,8 @@ util_lib = static_library(
         capnhook.get_variable('hook_dep'),
     ],
     sources : [
+        'clock.c',
+        'clock.h',
         'crc.c',
         'crc.h',
         'dprintf.c',