Implement oodle DLL loader for Linux

get_oodle/Cargo.toml

@@ -6,11 +6,18 @@ license.workspace = true
 version.workspace = true
 edition.workspace = true
 
+[target.'cfg(windows)'.dependencies]
+libloading = "0.7"
+
+[target.'cfg(unix)'.dependencies]
+object = { version = "0.32.1", default-features = false, features = ["std", "read"] }
+libc = "0.2.148"
+seq-macro = "0.3.5"
+
 [dependencies]
-repak = { path = "../repak", features = ["oodle"] }
 sha1 = { workspace = true }
 ureq = "2.6"
-once_cell = "1.17"
 hex-literal = "0.4"
-libloading = "0.7"
-hex = { workspace = true }
+hex = { workspace = true }
+anyhow = "1.0.75"
+lzma-rs = "0.3.0"

get_oodle/src/lib.rs

@@ -1,35 +1,389 @@
-pub fn decompress() -> repak::Decompress {
-    *unsafe { OODLE.as_ref().unwrap().get(b"OodleLZ_Decompress") }.unwrap()
+use anyhow::{anyhow, Result};
+
+use std::sync::OnceLock;
+
+type OodleDecompress = fn(comp_buf: &[u8], raw_buf: &mut [u8]) -> i32;
+
+#[allow(non_camel_case_types)]
+type OodleLZ_Decompress = unsafe extern "win64" fn(
+    compBuf: *const u8,
+    compBufSize: usize,
+    rawBuf: *mut u8,
+    rawLen: usize,
+    fuzzSafe: u32,
+    checkCRC: u32,
+    verbosity: u32,
+    decBufBase: u64,
+    decBufSize: usize,
+    fpCallback: u64,
+    callbackUserData: u64,
+    decoderMemory: *mut u8,
+    decoderMemorySize: usize,
+    threadPhase: u32,
+) -> i32;
+
+pub fn decompress() -> OodleDecompress {
+    #[cfg(windows)]
+    return windows_oodle::decompress_wrapper_windows;
+    #[cfg(unix)]
+    return linux_oodle::get_oodle_linux();
+}
+
+fn call_decompress(comp_buf: &[u8], raw_buf: &mut [u8], decompress: OodleLZ_Decompress) -> i32 {
+    unsafe {
+        decompress(
+            comp_buf.as_ptr(),
+            comp_buf.len(),
+            raw_buf.as_mut_ptr(),
+            raw_buf.len(),
+            1,
+            1,
+            0,
+            0,
+            0,
+            0,
+            0,
+            std::ptr::null_mut(),
+            0,
+            3,
+        )
+    }
 }
 
-use once_cell::sync::Lazy;
-static OODLE: Lazy<Result<libloading::Library, String>> =
-    Lazy::new(|| get_oodle().map_err(|e| e.to_string()));
 static OODLE_HASH: [u8; 20] = hex_literal::hex!("4bcc73614cb8fd2b0bce8d0f91ee5f3202d9d624");
 
-fn get_oodle() -> Result<libloading::Library, repak::Error> {
+fn fetch_oodle() -> Result<std::path::PathBuf> {
     use sha1::{Digest, Sha1};
 
-    let oodle = std::env::current_exe()?.with_file_name("oo2core_9_win64.dll");
-    if !oodle.exists() {
-        let mut data = vec![];
-        ureq::get("https://cdn.discordapp.com/attachments/817251677086285848/992648087371792404/oo2core_9_win64.dll")
-            .call().map_err(|e| repak::Error::Other(e.to_string()))?
-            .into_reader().read_to_end(&mut data)?;
+    let oodle_path = std::env::current_exe()?.with_file_name("oo2core_9_win64.dll");
+    if !oodle_path.exists() {
+        let mut compressed = vec![];
+        ureq::get("https://origin.warframe.com/Tools/Oodle/x64/final/oo2core_9_win64.dll.F2DB01967705B62AECEF3CD3E5A28E4D.lzma")
+            .call()?
+            .into_reader().read_to_end(&mut compressed)?;
 
-        std::fs::write(&oodle, data)?;
+        let mut decompressed = vec![];
+        lzma_rs::lzma_decompress(&mut std::io::Cursor::new(compressed), &mut decompressed).unwrap();
+
+        std::fs::write(&oodle_path, decompressed)?;
     }
 
     let mut hasher = Sha1::new();
-    hasher.update(std::fs::read(&oodle)?);
+    hasher.update(std::fs::read(&oodle_path)?);
     let hash = hasher.finalize();
     (hash[..] == OODLE_HASH).then_some(()).ok_or_else(|| {
-        repak::Error::Other(format!(
+        anyhow!(
             "oodle hash mismatch expected: {} got: {} ",
             hex::encode(OODLE_HASH),
             hex::encode(hash)
-        ))
+        )
     })?;
 
-    unsafe { libloading::Library::new(oodle) }.map_err(|_| repak::Error::OodleFailed)
+    Ok(oodle_path)
+}
+
+#[cfg(windows)]
+mod windows_oodle {
+    use super::*;
+
+    use anyhow::Context;
+
+    static DECOMPRESS: OnceLock<(OodleLZ_Decompress, libloading::Library)> = OnceLock::new();
+
+    pub fn decompress_wrapper_windows(comp_buf: &[u8], raw_buf: &mut [u8]) -> i32 {
+        let decompress = DECOMPRESS.get_or_init(|| {
+            let path = fetch_oodle().context("failed to fetch oodle").unwrap();
+
+            let lib = unsafe { libloading::Library::new(path) }
+                .context("failed to load oodle")
+                .unwrap();
+
+            (*unsafe { lib.get(b"OodleLZ_Decompress") }.unwrap(), lib)
+        });
+        call_decompress(comp_buf, raw_buf, decompress.0)
+    }
+}
+
+#[cfg(unix)]
+mod linux_oodle {
+    use super::*;
+
+    use anyhow::Result;
+    use object::pe::{
+        ImageNtHeaders64, IMAGE_REL_BASED_DIR64, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ,
+        IMAGE_SCN_MEM_WRITE,
+    };
+    use object::read::pe::{ImageOptionalHeader, ImageThunkData, PeFile64};
+
+    use object::{LittleEndian as LE, Object, ObjectSection};
+    use std::collections::HashMap;
+    use std::ffi::{c_void, CStr};
+
+    #[repr(C)]
+    struct ThreadInformationBlock {
+        exception_list: *const c_void,
+        stack_base: *const c_void,
+        stack_limit: *const c_void,
+        sub_system_tib: *const c_void,
+        fiber_data: *const c_void,
+        arbitrary_user_pointer: *const c_void,
+        teb: *const c_void,
+    }
+
+    const TIB: ThreadInformationBlock = ThreadInformationBlock {
+        exception_list: std::ptr::null(),
+        stack_base: std::ptr::null(),
+        stack_limit: std::ptr::null(),
+        sub_system_tib: std::ptr::null(),
+        fiber_data: std::ptr::null(),
+        arbitrary_user_pointer: std::ptr::null(),
+        teb: std::ptr::null(),
+    };
+
+    static DECOMPRESS: OnceLock<OodleLZ_Decompress> = OnceLock::new();
+
+    fn decompress_wrapper(comp_buf: &[u8], raw_buf: &mut [u8]) -> i32 {
+        unsafe {
+            // Set GS register in calling thread
+            const ARCH_SET_GS: i32 = 0x1001;
+            libc::syscall(libc::SYS_arch_prctl, ARCH_SET_GS, &TIB);
+
+            // Call actual decompress function
+            call_decompress(comp_buf, raw_buf, *DECOMPRESS.get().unwrap())
+        }
+    }
+
+    #[allow(non_snake_case)]
+    mod imports {
+        use super::*;
+
+        pub unsafe extern "win64" fn OutputDebugStringA(string: *const std::ffi::c_char) {
+            print!("[OODLE] {}", CStr::from_ptr(string).to_string_lossy());
+        }
+        pub unsafe extern "win64" fn GetProcessHeap() -> *const c_void {
+            0x12345678 as *const c_void
+        }
+        pub unsafe extern "win64" fn HeapAlloc(
+            _heap: *const c_void,
+            flags: i32,
+            size: usize,
+        ) -> *const c_void {
+            assert_eq!(0, flags);
+            libc::malloc(size)
+        }
+        pub unsafe extern "win64" fn HeapFree(
+            _heap: *const c_void,
+            _flags: i32,
+            ptr: *mut c_void,
+        ) -> bool {
+            libc::free(ptr);
+            true
+        }
+        pub unsafe extern "win64" fn memset(
+            ptr: *mut c_void,
+            value: i32,
+            num: usize,
+        ) -> *const c_void {
+            libc::memset(ptr, value, num)
+        }
+        pub unsafe extern "win64" fn memmove(
+            destination: *mut c_void,
+            source: *const c_void,
+            num: usize,
+        ) -> *const c_void {
+            libc::memmove(destination, source, num)
+        }
+        pub unsafe extern "win64" fn memcpy(
+            destination: *mut c_void,
+            source: *const c_void,
+            num: usize,
+        ) -> *const c_void {
+            libc::memcpy(destination, source, num)
+        }
+    }
+
+    // Create some unique function pointers to use for unimplemented imports
+    const DEBUG_FNS: [*const fn(); 100] = gen_debug_fns();
+    static mut DEBUG_NAMES: [&str; 100] = [""; 100];
+    const fn gen_debug_fns() -> [*const fn(); 100] {
+        fn log<const I: usize>() {
+            unimplemented!("import {:?}", unsafe { DEBUG_NAMES[I] });
+        }
+        let mut array = [std::ptr::null(); 100];
+        seq_macro::seq!(N in 0..100 {
+            array[N] = log::<N> as *const fn();
+        });
+        array
+    }
+
+    pub fn get_oodle_linux() -> OodleDecompress {
+        DECOMPRESS.get_or_init(|| get_decompress_inner().unwrap());
+        decompress_wrapper
+    }
+
+    fn get_decompress_inner() -> Result<OodleLZ_Decompress> {
+        fetch_oodle().ok();
+        let oodle = std::env::current_exe()
+            .unwrap()
+            .with_file_name("oo2core_9_win64.dll");
+        let dll = std::fs::read(&oodle)?;
+
+        let obj_file = PeFile64::parse(&*dll)?;
+
+        let size = obj_file.nt_headers().optional_header.size_of_image() as usize;
+        let header_size = obj_file.nt_headers().optional_header.size_of_headers() as usize;
+
+        let image_base = obj_file.relative_address_base() as usize;
+
+        // Create map
+        let mmap = unsafe {
+            std::slice::from_raw_parts_mut(
+                libc::mmap(
+                    std::ptr::null_mut(),
+                    size,
+                    libc::PROT_READ | libc::PROT_WRITE,
+                    libc::MAP_PRIVATE | libc::MAP_ANONYMOUS,
+                    -1,
+                    0,
+                ) as *mut u8,
+                size,
+            )
+        };
+
+        let map_base = mmap.as_ptr();
+
+        // Copy header to map
+        mmap[0..header_size].copy_from_slice(&dll[0..header_size]);
+        unsafe {
+            assert_eq!(
+                0,
+                libc::mprotect(
+                    mmap.as_mut_ptr() as *mut c_void,
+                    header_size,
+                    libc::PROT_READ
+                )
+            );
+        }
+
+        // Copy section data to map
+        for section in obj_file.sections() {
+            let address = section.address() as usize;
+            let data = section.data()?;
+            mmap[(address - image_base)..(address - image_base + data.len())]
+                .copy_from_slice(section.data()?);
+        }
+
+        // Apply relocations
+        let sections = obj_file.section_table();
+        let mut blocks = obj_file
+            .data_directories()
+            .relocation_blocks(&*dll, &sections)?
+            .unwrap();
+
+        while let Some(block) = blocks.next()? {
+            let block_address = block.virtual_address();
+            let block_data = sections.pe_data_at(&*dll, block_address).map(object::Bytes);
+            for reloc in block {
+                let offset = (reloc.virtual_address - block_address) as usize;
+                match reloc.typ {
+                    IMAGE_REL_BASED_DIR64 => {
+                        let addend = block_data
+                            .and_then(|data| data.read_at::<object::U64Bytes<LE>>(offset).ok())
+                            .map(|addend| addend.get(LE));
+                        if let Some(addend) = addend {
+                            mmap[reloc.virtual_address as usize
+                                ..reloc.virtual_address as usize + 8]
+                                .copy_from_slice(&u64::to_le_bytes(
+                                    addend - image_base as u64 + map_base as u64,
+                                ));
+                        }
+                    }
+                    _ => unimplemented!(),
+                }
+            }
+        }
+
+        // Fix up imports
+        let import_table = obj_file.import_table()?.unwrap();
+        let mut import_descs = import_table.descriptors()?;
+
+        let mut i = 0;
+        while let Some(import_desc) = import_descs.next()? {
+            let mut thunks = import_table.thunks(import_desc.original_first_thunk.get(LE))?;
+
+            let mut address = import_desc.first_thunk.get(LE) as usize;
+            while let Some(thunk) = thunks.next::<ImageNtHeaders64>()? {
+                let (_hint, name) = import_table.hint_name(thunk.address())?;
+                let name = String::from_utf8_lossy(name).to_string();
+
+                use imports::*;
+
+                let fn_addr = match name.as_str() {
+                    "OutputDebugStringA" => OutputDebugStringA as usize,
+                    "GetProcessHeap" => GetProcessHeap as usize,
+                    "HeapAlloc" => HeapAlloc as usize,
+                    "HeapFree" => HeapFree as usize,
+                    "memset" => memset as usize,
+                    "memcpy" => memcpy as usize,
+                    "memmove" => memmove as usize,
+                    _ => {
+                        unsafe { DEBUG_NAMES[i] = name.leak() }
+                        let a = DEBUG_FNS[i] as usize;
+                        i += 1;
+                        a
+                    }
+                };
+
+                mmap[address..address + 8].copy_from_slice(&usize::to_le_bytes(fn_addr));
+
+                address += 8;
+            }
+        }
+
+        // Build export table
+        let mut exports = HashMap::new();
+        for export in obj_file.exports()? {
+            let name = String::from_utf8_lossy(export.name());
+            let address = export.address() - image_base as u64 + map_base as u64;
+            exports.insert(name, address as *const c_void);
+        }
+
+        // Fix section permissions
+        for section in obj_file.sections() {
+            let address = section.address() as usize;
+            let data = section.data()?;
+            let size = data.len();
+
+            let mut permissions = 0;
+
+            let flags = match section.flags() {
+                object::SectionFlags::Coff { characteristics } => characteristics,
+                _ => unreachable!(),
+            };
+
+            if 0 != flags & IMAGE_SCN_MEM_READ {
+                permissions |= libc::PROT_READ;
+            }
+            if 0 != flags & IMAGE_SCN_MEM_WRITE {
+                permissions |= libc::PROT_WRITE;
+            }
+            if 0 != flags & IMAGE_SCN_MEM_EXECUTE {
+                permissions |= libc::PROT_EXEC;
+            }
+
+            unsafe {
+                assert_eq!(
+                    0,
+                    libc::mprotect(
+                        mmap.as_mut_ptr().add(address - image_base) as *mut c_void,
+                        size,
+                        permissions
+                    )
+                );
+            }
+        }
+
+        // Break things!
+        Ok(unsafe { std::mem::transmute(exports["OodleLZ_Decompress"]) })
+    }
 }

repak/src/entry.rs

@@ -393,30 +393,18 @@ impl Entry {
                     };
                     let buffer = &mut data[range];
                     let out = oodle(
-                        buffer.as_mut_ptr(),
-                        buffer.len(),
-                        decompressed.as_mut_ptr().offset(decompress_offset),
-                        decomp,
-                        1,
-                        1,
-                        0, //verbose 3
-                        0,
-                        0,
-                        0,
-                        0,
-                        std::ptr::null_mut(),
-                        0,
-                        3,
+                        buffer,
+                        &mut decompressed[decompress_offset..decompress_offset + decomp],
                     );
                     if out == 0 {
                         return Err(super::Error::DecompressionFailed(Compression::Oodle));
                     }
                     compress_offset += self.compression_block_size as usize;
-                    decompress_offset += out as isize;
+                    decompress_offset += out as usize;
                 }
 
                 debug_assert_eq!(
-                    decompress_offset, self.uncompressed as isize,
+                    decompress_offset, self.uncompressed as usize,
                     "Oodle decompression length mismatch"
                 );
                 buf.write_all(&decompressed)?;

repak/src/lib.rs

@@ -10,25 +10,10 @@ pub use {error::*, pak::*};
 pub const MAGIC: u32 = 0x5A6F12E1;
 
 #[cfg(feature = "oodle")]
-static mut OODLE: Option<once_cell::sync::Lazy<Decompress>> = None;
+static mut OODLE: Option<once_cell::sync::Lazy<OodleDecompress>> = None;
 
 #[cfg(feature = "oodle")]
-pub type Decompress = unsafe extern "C" fn(
-    compBuf: *mut u8,
-    compBufSize: usize,
-    rawBuf: *mut u8,
-    rawLen: usize,
-    fuzzSafe: u32,
-    checkCRC: u32,
-    verbosity: u32,
-    decBufBase: u64,
-    decBufSize: usize,
-    fpCallback: u64,
-    callbackUserData: u64,
-    decoderMemory: *mut u8,
-    decoderMemorySize: usize,
-    threadPhase: u32,
-) -> i32;
+type OodleDecompress = fn(comp_buf: &[u8], raw_buf: &mut [u8]) -> i32;
 
 #[derive(
     Clone,
@@ -158,7 +143,7 @@ impl From<aes::Aes256> for Key {
 
 #[cfg(feature = "oodle")]
 pub(crate) enum Oodle<'func> {
-    Some(&'func Decompress),
+    Some(&'func OodleDecompress),
     None,
 }
 

repak/src/pak.rs

@@ -21,7 +21,7 @@ impl PakBuilder {
         self
     }
     #[cfg(feature = "oodle")]
-    pub fn oodle(self, oodle: fn() -> super::Decompress) -> Self {
+    pub fn oodle(self, oodle: fn() -> super::OodleDecompress) -> Self {
         unsafe { super::OODLE = Some(once_cell::sync::Lazy::new(oodle)) }
         self
     }

repak_cli/Cargo.toml

@@ -10,14 +10,9 @@ edition.workspace = true
 name = "repak"
 path = "src/main.rs"
 
-[target.'cfg(windows)'.dependencies]
-repak = { path = "../repak", features = ["oodle"] }
-
-[target.'cfg(not(windows))'.dependencies]
-repak = { path = "../repak" }
-
 [dependencies]
 get_oodle = { path = "../get_oodle" }
+repak = { path = "../repak", features = ["oodle"] }
 aes = { workspace = true }
 base64 = { workspace = true }
 clap = { version = "4.1.4", features = ["derive"] }

repak_cli/src/main.rs

@@ -282,11 +282,7 @@ const STYLE: &str = "[{elapsed_precise}] [{wide_bar}] {pos}/{len} ({eta})";
 
 fn unpack(aes_key: Option<aes::Aes256>, action: ActionUnpack) -> Result<(), repak::Error> {
     for input in &action.input {
-        let mut builder = repak::PakBuilder::new();
-        #[cfg(windows)]
-        {
-            builder = builder.oodle(get_oodle::decompress);
-        }
+        let mut builder = repak::PakBuilder::new().oodle(get_oodle::decompress);
         if let Some(aes_key) = aes_key.clone() {
             builder = builder.key(aes_key);
         }
@@ -457,11 +453,7 @@ fn pack(args: ActionPack) -> Result<(), repak::Error> {
 
 fn get(aes_key: Option<aes::Aes256>, args: ActionGet) -> Result<(), repak::Error> {
     let mut reader = BufReader::new(File::open(&args.input)?);
-    let mut builder = repak::PakBuilder::new();
-    #[cfg(windows)]
-    {
-        builder = builder.oodle(get_oodle::decompress);
-    }
+    let mut builder = repak::PakBuilder::new().oodle(get_oodle::decompress);
     if let Some(aes_key) = aes_key {
         builder = builder.key(aes_key);
     }