random loader name

BackstageInjection-Rust/build.rs

@@ -1,3 +1,5 @@
+use std::time::{SystemTime, UNIX_EPOCH};
+
 fn main() {
     let root_dir = std::env::var("CARGO_MANIFEST_DIR").unwrap();
     let mh_dir = std::path::Path::new(&root_dir).join("vendor/minhook");
@@ -22,5 +24,33 @@ fn main() {
         .file(mh_src.join(hde))
         .compile("libminhook.a");
 
+    generate_loader_entry();
+
     println!("cargo:rerun-if-changed=vendor/minhook");
+    println!("cargo:rerun-if-changed=build.rs");
+}
+
+fn generate_loader_entry() {
+    let seed = SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .unwrap()
+        .as_nanos() as u64
+        ^ (std::process::id() as u64).wrapping_mul(0x9E37_79B9_7F4A_7C15);
+    let name = format!("x{:06x}", seed & 0xFFFF_FF);
+
+    let src = format!(
+        "// Generated by build.rs — do not edit.\n\
+         // Randomized per-build reflective loader export name.\n\
+         pub(crate) const LOADER_EXPORT: &[u8] = b\"{name}\\0\";\n\
+         \n\
+         #[unsafe(no_mangle)]\n\
+         pub extern \"system\" fn {name}(lpParameter: usize) -> usize {{\n\
+         \x20   crate::reflective::loader_impl(lpParameter)\n\
+         }}\n"
+    );
+
+    let out_dir = std::env::var("OUT_DIR").unwrap();
+    std::fs::write(std::path::Path::new(&out_dir).join("loader_entry.rs"), src)
+        .expect("failed to write loader_entry.rs");
+    println!("cargo:rerun-if-changed=loader_entry.rs");
 }