some work on older versions

Cargo.lock

@@ -267,6 +267,7 @@ dependencies = [
  "dll-syringe",
  "poggers",
  "rust-embed",
+ "thiserror",
  "windows",
 ]
 

Cargo.toml

@@ -24,6 +24,7 @@ rust-embed = { version = "*", features = [
   "interpolate-folder-path",
 ] }
 anyhow = "*"
+thiserror = "*"
 windows = { features = [
   "Win32_Foundation",
   "Win32_System",

gdkeinj/src/lib.rs

@@ -14,37 +14,62 @@ static_detour! {
     pub static OpenAndParse:  unsafe extern "fastcall" fn(*const i32, *const i32, *const u8, bool) -> ();
 }
 
-#[cfg_attr(debug_assertions, poggers_derive::create_entry)]
-#[cfg_attr(not(debug_assertions), poggers_derive::create_entry(no_console))]
-pub fn main() {
-    let mut sigs = HashMap::<u32, (&'static str, i32)>::new();
-    sigs.insert(
-        1,
-        ("E8 ? ? ? ? 85 C0 0F 84 ? ? ? ? 49 8B 8C 24 ? ? ? ?", -0x3c),
-    );
-    let sock = UdpSocket::bind("127.0.0.1:29849").unwrap();
-    sock.connect("127.0.0.1:28713").expect("uanble to connect");
-
+const SIGS: [&str; 2] = [
+    // call into open_and_parse
+    "E8 ? ? ? ? 85 C0 0F 84 ? ? ? ? 49 8B 8C 24 ? ? ? ?", // 4.x (4.2.1)
+    "E8 ? ? ? ? 8B D8 85 C0 0F 84 ? ? ? ? 49 8B 04 24",   // 3.x
+];
+#[repr(u8)]
+#[derive(Debug)]
+enum SigErrors {
+    NotFound,
+}
+fn find_sig_addr(sig_type: usize) -> Result<*const c_void, SigErrors> {
     let proc = Process::this_process();
     let modd = proc.get_base_module().unwrap();
 
-    println!("sending data, waiting for sig ver");
-    let buf = [1; 1];
-    sock.send(&buf).ok();
-
-    let mut sig_type = [0; 4];
-    sock.recv(&mut sig_type).unwrap();
-    let int_sig = u32::from_ne_bytes(sig_type);
-    let sig = sigs.get(&int_sig).expect("sig type match not compatible");
-    let addr = modd.scan(sig.0).unwrap().unwrap() as isize;
+    let sig = SIGS
+        .get(sig_type as usize)
+        .ok_or_else(|| SigErrors::NotFound)?;
+    let addr = modd
+        .scan(sig)
+        .map_err(|_| SigErrors::NotFound)?
+        .ok_or_else(|| SigErrors::NotFound)? as isize;
+    println!("sig found: {:x} ", addr);
     let ptr_to_fn = (addr as usize + size_of::<u8>()) as *const u8;
     let mut addr_offset = [0; 4];
     unsafe { std::ptr::copy(ptr_to_fn, addr_offset.as_mut_ptr(), 4) };
     let by = i32::from_ne_bytes(addr_offset);
     let fn_ptr = (addr + by as isize + 5) as *const c_void;
-    println!("fnptr = {:x?}", fn_ptr);
+    println!("fnptr = {:x?} B = ${addr_offset:?}, ${by:?}", fn_ptr);
+
+    Ok(fn_ptr)
+}
+#[cfg_attr(debug_assertions, poggers_derive::create_entry(no_free))]
+#[cfg_attr(not(debug_assertions), poggers_derive::create_entry(no_console))]
+pub fn main() {
+    let sock = UdpSocket::bind("127.0.0.1:29849").unwrap();
+    sock.connect("127.0.0.1:28713").expect("uanble to connect");
+
+    println!("sending data, waiting for sig ver");
+    let buf = [];
+    sock.send(&buf).ok();
+
+    let mut sig_type = [0; 4];
+    sock.recv(&mut sig_type).unwrap();
+    let int_sig = u32::from_ne_bytes(sig_type);
+    let fn_ptr = find_sig_addr(int_sig as usize);
+    let fn_ptr = match fn_ptr {
+        Ok(x) => x,
+        Err(err) => {
+            println!("err  {err:?}");
+
+            std::thread::sleep(Duration::from_secs(100));
+            sock.send(&[err as u8]).ok();
+            return;
+        }
+    };
 
-    println!("sig found: {:x} ", addr);
     let sock2 = sock.try_clone().unwrap();
     unsafe {
         let open_and_parse = std::mem::transmute::<isize, open_and_parse_t>(fn_ptr as isize);
@@ -61,5 +86,5 @@ pub fn main() {
         opp.enable().expect("failed to enable detour");
         println!("detour enabled {}", opp.is_enabled());
     }
-    sock.send(&[]).ok();
+    sock.send(&(400195u32.to_ne_bytes())).ok();
 }

src/lib.rs

@@ -10,6 +10,7 @@ use std::{
 use dll_syringe::{process::OwnedProcess, Syringe};
 use poggers::{exports::HANDLE, structures::process::Process, traits::Mem};
 use rust_embed::RustEmbed;
+use thiserror::Error;
 use windows::{
     core::{PCSTR, PSTR},
     Win32::{
@@ -28,6 +29,22 @@ use windows::{
     Win32::System::{Diagnostics::Debug::IMAGE_NT_HEADERS64, Threading::ResumeThread},
 };
 
+use crate::versioning::check_gd_ver;
+#[repr(u8)]
+#[derive(Error, Debug)]
+enum SigErrors {
+    #[error("Signature not found")]
+    NotFound,
+}
+impl From<u8> for SigErrors {
+    fn from(value: u8) -> Self {
+        match value {
+            0 => Self::NotFound,
+            default => Self::NotFound,
+        }
+    }
+}
+
 fn create_pstr(c_str: &CStr) -> PSTR {
     PSTR::from_raw(c_str.as_ptr() as *mut u8)
 }
@@ -106,7 +123,7 @@ pub unsafe fn spawn_and_inject(proc: &str) -> anyhow::Result<[u8; 32]> {
     ResumeThread(proc_info.hThread);
     // wait until trapped... and inject
     let sock = UdpSocket::bind("127.0.0.1:28713").expect("failed to bind socket");
-    {
+    let res: anyhow::Result<()> = {
         let target = OwnedProcess::from_pid(proc.get_pid()).unwrap();
         let syrnge = Syringe::for_process(target);
         let dll_loc = if cfg!(debug_assertions) {
@@ -123,21 +140,50 @@ pub unsafe fn spawn_and_inject(proc: &str) -> anyhow::Result<[u8; 32]> {
             file.write_all(&gdke_inj_dll.data).unwrap();
             loc.to_str().map(|x| x.to_string()).unwrap()
         };
+        let game_ver = check_gd_ver(pth)?;
+        println!("gamever = {game_ver}");
+        let sig_id = match game_ver
+            .chars()
+            .next()
+            .ok_or(anyhow::anyhow!("unable to check gd version"))?
+        {
+            '4' => 0u32,
+            '3' => 1u32,
+            _ => return Err(anyhow::anyhow!("invalid godot version")),
+        };
+
         println!("injecting dll ({})", dll_loc);
-        syrnge.inject(dll_loc).unwrap();
+        syrnge.inject(dll_loc)?;
 
         println!("waiting until udp is ok ");
 
         let (_, addr) = sock.recv_from(&mut [0]).unwrap();
-        sock.send_to(&1_u32.to_ne_bytes(), addr).unwrap();
-        sock.recv(&mut [])?;
-    }
+        println!("using sig id {sig_id}");
+        sock.send_to(&sig_id.to_ne_bytes(), addr).unwrap();
+        let mut error = [0u8; 4];
+        sock.recv(&mut error)?;
+        println!("errors -> {error:?}");
+        if error.is_empty() {
+            return Err(SigErrors::from(error[0]).into());
+        }
+        Ok(())
+    };
+    res?;
     // we're done. let's kill the process.
     println!("done, running code",);
+    #[cfg(debug_assertions)]
+    {
+        println!("[debug] waiting for input");
+        std::io::stdin().read_line(&mut String::new());
+    }
     proc.write(code_entry as usize, &entry_insts)?;
     println!("waiting for call.");
     let mut key = [0; 32];
     sock.recv(&mut key)?;
+    if key.len() == 1 {
+        eprintln!("recieved err");
+        return Err(SigErrors::from(key[0]).into());
+    }
     println!("recieved key, term");
     Ok(key)
 }

src/versioning.rs

@@ -1,20 +1,18 @@
 use std::{
-    io::{BufRead, Cursor},
+    io::{BufRead, Cursor, Read},
     path::Path,
     process::{Command, Stdio},
 };
-fn check_gd_ver(exe: &Path) -> anyhow::Result<String> {
+pub fn check_gd_ver(exe: &Path) -> anyhow::Result<String> {
     assert!(exe.exists());
     let stdo = Command::new(exe)
-        .arg("-V")
-        .arg("-s")
-        .arg("random-no-way-a-game-has-this-btw")
-        .stdout(Stdio::null())
+        .arg("--version")
+        // .stderr(Stdio::null())
         .output()?;
-    let bufr = Cursor::new(stdo.stdout);
+    let mut bufr = Cursor::new(stdo.stdout);
 
-    Ok(bufr
-        .lines()
-        .next()
-        .ok_or(anyhow::anyhow!("unable to read version"))??)
+    let mut out = String::new();
+    bufr.read_to_string(&mut out)
+        .map_err(|_| anyhow::anyhow!("unable to read version"))?;
+    Ok(out.trim().to_string())
 }