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"0.1.0" +edition = "2021" + +[lib] +name = "goblin" +crate-type = ["cdylib"] + +[dependencies] +goblin = "0.7.1" +pyo3 = { version = "0.20.0", features = ["extension-module"] } diff --git a/crates/goblin-pyo3/pyproject.toml b/crates/goblin-pyo3/pyproject.toml new file mode 100644 index 0000000..2dc499f --- /dev/null +++ b/crates/goblin-pyo3/pyproject.toml @@ -0,0 +1,13 @@ +[build-system] +requires = ["maturin>=1,<2"] +build-backend = "maturin" + +[project] +name = "goblin" +requires-python = ">=3.7" +classifiers = [ + "Programming Language :: Rust", + "Programming Language :: Python :: Implementation :: CPython", + "Programming Language :: Python :: Implementation :: PyPy", +] + diff --git a/crates/goblin-pyo3/src/lib.rs b/crates/goblin-pyo3/src/lib.rs new file mode 100644 index 0000000..4ad0289 --- /dev/null +++ b/crates/goblin-pyo3/src/lib.rs @@ -0,0 +1,400 @@ +use std::{ + fs::File, + io::Read, +}; + +use goblin::{ + mach::{symbols::Nlist, Mach}, +}; +use pyo3::{prelude::*, exceptions::PyTypeError}; + +#[pyclass] +struct Object { + len: usize, + ptr: *mut u8, + inner: Option>, +} + +// SAFETY: We only use `ptr` in `drop` to reconstruct a `Vec` +unsafe impl Send for Object {} + +#[pymethods] +impl Object { + #[new] + fn new(path: String) -> Self { + let mut file = File::open(path).unwrap(); + let size = file.metadata().map(|m| m.len() as usize).ok(); + let mut vec = Vec::with_capacity(size.unwrap_or(0)); + file.read_to_end(&mut vec).unwrap(); + + vec.shrink_to_fit(); + let len = vec.len(); + let cap = vec.capacity(); + let ptr = vec.as_mut_ptr(); + assert!(len == cap); + + let obj = vec.leak(); + let object = goblin::Object::parse(obj).unwrap(); + + Self { + len, + ptr, + inner: Some(object), + } + } + + #[getter] + fn header(&self) -> Header { + match self.inner.as_ref().unwrap() { + goblin::Object::Mach(Mach::Binary(macho)) => Header::from(macho.header), + _ => unimplemented!(), + } + } + + #[getter] + fn name(&self) -> Option<&str> { + match self.inner.as_ref().unwrap() { + goblin::Object::Mach(Mach::Binary(macho)) => macho.name.clone(), + _ => unimplemented!(), + } + } + + fn symbols(&self) -> Symbols { + match self.inner.as_ref().unwrap() { + goblin::Object::Mach(Mach::Binary(macho)) => Symbols::from(macho.symbols()), + _ => unimplemented!(), + } + } + + #[getter] + fn libs(&self) -> Vec<&str> { + match self.inner.as_ref().unwrap() { + goblin::Object::Mach(Mach::Binary(macho)) => macho.libs.clone(), + _ => unimplemented!(), + } + } + + #[getter] + fn rpaths(&self) -> Vec<&str> { + match self.inner.as_ref().unwrap() { + goblin::Object::Mach(Mach::Binary(macho)) => macho.rpaths.clone(), + _ => unimplemented!(), + } + } + + fn exports(&self) -> Result, PyErr> { + match self.inner.as_ref().unwrap() { + goblin::Object::Mach(Mach::Binary(macho)) => { + let exports = macho.exports().map_err(|_| PyErr::new::("failed"))?; + Ok(exports.into_iter().map(|exp| exp.into()).collect()) + }, + _ => unimplemented!(), + } + } + + fn imports(&self) -> Result, PyErr> { + match self.inner.as_ref().unwrap() { + goblin::Object::Mach(Mach::Binary(macho)) => { + let imports = macho.imports().map_err(|_| PyErr::new::("failed"))?; + Ok(imports.into_iter().map(|exp| exp.into()).collect()) + }, + _ => unimplemented!(), + } + } +} + +impl Drop for Object { + fn drop(&mut self) { + let obj = self.inner.take(); + drop(obj); + + // SAFETY: + // We took `ptr` and `len` from the vec earlier, + // then leaked it to get a stic reference to it which was only held within `self.inner`, + // which has been dropped above. + unsafe { + let vec = Vec::from_raw_parts(self.ptr, self.len, self.len); + drop(vec); + } + } +} + +#[derive(Debug, Clone)] +#[pyclass] +struct Header { + #[pyo3(get)] + magic: u32, + #[pyo3(get)] + cputype: u32, + #[pyo3(get)] + cpusubtype: u32, + #[pyo3(get)] + filetype: u32, + #[pyo3(get)] + ncmds: usize, + #[pyo3(get)] + sizeofcmds: u32, + #[pyo3(get)] + flags: u32, + #[pyo3(get)] + reserved: u32, +} + +impl From for Header { + fn from(other: goblin::mach::header::Header) -> Self { + Header { + magic: other.magic, + cputype: other.cputype, + cpusubtype: other.cpusubtype, + filetype: other.filetype, + ncmds: other.ncmds, + sizeofcmds: other.sizeofcmds, + flags: other.flags, + reserved: other.reserved, + } + } +} + +#[pymethods] +impl Header { + fn __repr__(&self) -> String { + format!("{:?}", self) + } +} + +#[derive(Debug, Clone)] +#[pyclass] +struct Symbol { + #[pyo3(get)] + name: String, + + meta: Nlist, +} + +#[pymethods] +impl Symbol { + #[getter] + fn typ(&self) -> &'static str { + self.meta.type_str() + } + + #[getter] + fn global(&self) -> bool { + self.meta.is_global() + } + + #[getter] + fn weak(&self) -> bool { + self.meta.is_weak() + } + + #[getter] + fn undefined(&self) -> bool { + self.meta.is_undefined() + } + + #[getter] + fn stab(&self) -> bool { + self.meta.is_stab() + } + + fn __repr__(&self) -> String { + format!( + "Symbol {{ name: {}, global: {}, weak: {}, undefined: {}, stab: {} }}", + self.name, + self.global(), + self.weak(), + self.undefined(), + self.stab() + ) + } +} + +#[pyclass] +struct Symbols { + symbols: Vec, +} + +#[pymethods] +impl Symbols { + fn __iter__(slf: PyRef<'_, Self>) -> PyResult> { + let iter = SymbolIter { + inner: slf.symbols.clone().into_iter(), + }; + Py::new(slf.py(), iter) + } +} + +impl From> for Symbols { + fn from(other: goblin::mach::symbols::SymbolIterator) -> Self { + let symbols = other + .map(|sym| { + let (symname, meta) = sym.unwrap(); + Symbol { + name: symname.to_string(), + meta, + } + }) + .collect(); + + Symbols { symbols } + } +} + +#[pyclass] +struct SymbolIter { + inner: std::vec::IntoIter, +} + +#[pymethods] +impl SymbolIter { + fn __iter__(slf: PyRef<'_, Self>) -> PyRef<'_, Self> { + slf + } + + fn __next__(mut slf: PyRefMut<'_, Self>) -> Option { + slf.inner.next() + } +} + +#[derive(Debug, Default, Clone)] +#[pyclass] +enum ExportTyp { + #[default] + Regular, + Reexport, + Stub +} + +#[derive(Debug, Default, Clone)] +#[pyclass] +pub struct ExportInfo { + #[pyo3(get)] + typ: ExportTyp, + #[pyo3(get)] + address: u64, + #[pyo3(get)] + flags: u64, + #[pyo3(get)] + lib: String, + #[pyo3(get)] + lib_symbol_name: Option, +} + +impl From> for ExportInfo { + fn from(info: goblin::mach::exports::ExportInfo) -> Self { + use goblin::mach::exports::ExportInfo::*; + match info { + Regular { address, flags } => { + Self { + typ: ExportTyp::Regular, + address, + flags, + .. Default::default() + } + } + Reexport { lib, lib_symbol_name, flags } => { + Self { + typ: ExportTyp::Reexport, + lib: lib.to_string(), + lib_symbol_name: lib_symbol_name.map(|s| s.to_string()), + flags, + .. Default::default() + } + } + Stub { + flags, .. + } => { + Self { + typ: ExportTyp::Stub, + flags, + .. Default::default() + } + } + } + } +} + +#[derive(Debug)] +#[pyclass] +struct Export { + #[pyo3(get)] + name: String, + #[pyo3(get)] + info: ExportInfo, + #[pyo3(get)] + size: usize, + #[pyo3(get)] + offset: u64, +} + +#[pymethods] +impl Export { + fn __repr__(&self) -> String { + format!("{:?}", self) + } +} + +impl From> for Export { + fn from(export: goblin::mach::exports::Export) -> Self { + Self { + name: export.name, + info: export.info.into(), + size: export.size, + offset: export.offset, + } + } +} + +#[derive(Debug)] +#[pyclass] +struct Import { + #[pyo3(get)] + name: String, + #[pyo3(get)] + dylib: String, + #[pyo3(get)] + is_lazy: bool, + #[pyo3(get)] + offset: u64, + #[pyo3(get)] + size: usize, + #[pyo3(get)] + address: u64, + #[pyo3(get)] + addend: i64, + #[pyo3(get)] + is_weak: bool, + #[pyo3(get)] + start_of_sequence_offset: u64, +} + +#[pymethods] +impl Import { + fn __repr__(&self) -> String { + format!("{:?}", self) + } +} + +impl From> for Import { + fn from(import: goblin::mach::imports::Import<'_>) -> Self { + Self { + name: import.name.to_string(), + dylib: import.dylib.to_string(), + is_lazy: import.is_lazy, + offset: import.offset, + size: import.size, + address: import.address, + addend: import.addend, + is_weak: import.is_weak, + start_of_sequence_offset: import.start_of_sequence_offset, + } + } +} + +#[pymodule] +#[pyo3(name = "goblin")] +fn py_goblin(_py: Python<'_>, m: &PyModule) -> PyResult<()> { + m.add_class::()?; + Ok(()) +} diff --git a/crates/goblin-pyo3/test.py b/crates/goblin-pyo3/test.py new file mode 100644 index 0000000..d6a8724 --- /dev/null +++ b/crates/goblin-pyo3/test.py @@ -0,0 +1,22 @@ +import goblin + +g = goblin.Object("mylib.dylib") +print(g.header) +print(g.name) + +print("symbols") +for sym in g.symbols(): + print(sym) + break + +print("libs") +print(g.libs) + +print("rpaths") +print(g.rpaths) + +print("exports") +print(len(g.exports())) + +print("imports") +print(len(g.imports()))