mirror of
https://github.com/denoland/deno.git
synced 2024-12-22 07:14:47 -05:00
526 lines
13 KiB
Rust
526 lines
13 KiB
Rust
// Copyright 2021 the Deno authors. All rights reserved. MIT license.
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use deno_core::error::bad_resource_id;
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use deno_core::error::AnyError;
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use deno_core::include_js_files;
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use deno_core::op_async;
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use deno_core::op_sync;
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use deno_core::serde_json::json;
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use deno_core::serde_json::Value;
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use deno_core::Extension;
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use deno_core::OpState;
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use deno_core::Resource;
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use deno_core::ResourceId;
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use deno_core::ZeroCopyBuf;
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use dlopen::raw::Library;
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use libffi::middle::Arg;
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use serde::Deserialize;
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use std::borrow::Cow;
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use std::cell::RefCell;
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use std::collections::HashMap;
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use std::ffi::c_void;
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use std::path::Path;
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use std::path::PathBuf;
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use std::rc::Rc;
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pub struct Unstable(pub bool);
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fn check_unstable(state: &OpState, api_name: &str) {
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let unstable = state.borrow::<Unstable>();
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if !unstable.0 {
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eprintln!(
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"Unstable API '{}'. The --unstable flag must be provided.",
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api_name
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);
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std::process::exit(70);
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}
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}
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pub trait FfiPermissions {
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fn check(&mut self, path: &Path) -> Result<(), AnyError>;
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}
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#[derive(Clone)]
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struct Symbol {
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cif: libffi::middle::Cif,
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ptr: libffi::middle::CodePtr,
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parameter_types: Vec<NativeType>,
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result_type: NativeType,
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}
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unsafe impl Send for Symbol {}
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unsafe impl Sync for Symbol {}
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struct DynamicLibraryResource {
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lib: Library,
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symbols: HashMap<String, Symbol>,
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}
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impl Resource for DynamicLibraryResource {
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fn name(&self) -> Cow<str> {
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"dynamicLibrary".into()
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}
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fn close(self: Rc<Self>) {
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drop(self)
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}
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}
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impl DynamicLibraryResource {
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fn register(
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&mut self,
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symbol: String,
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foreign_fn: ForeignFunction,
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) -> Result<(), AnyError> {
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let fn_ptr = unsafe { self.lib.symbol::<*const c_void>(&symbol) }?;
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let ptr = libffi::middle::CodePtr::from_ptr(fn_ptr as _);
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let cif = libffi::middle::Cif::new(
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foreign_fn
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.parameters
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.clone()
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.into_iter()
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.map(libffi::middle::Type::from),
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foreign_fn.result.into(),
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);
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self.symbols.insert(
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symbol,
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Symbol {
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cif,
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ptr,
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parameter_types: foreign_fn.parameters,
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result_type: foreign_fn.result,
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},
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);
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Ok(())
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}
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}
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pub fn init<P: FfiPermissions + 'static>(unstable: bool) -> Extension {
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Extension::builder()
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.js(include_js_files!(
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prefix "deno:ext/ffi",
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"00_ffi.js",
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))
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.ops(vec![
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("op_ffi_load", op_sync(op_ffi_load::<P>)),
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("op_ffi_call", op_sync(op_ffi_call)),
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("op_ffi_call_nonblocking", op_async(op_ffi_call_nonblocking)),
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])
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.state(move |state| {
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// Stolen from deno_webgpu, is there a better option?
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state.put(Unstable(unstable));
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Ok(())
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})
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.build()
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}
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#[derive(Clone, Copy, Debug, Deserialize, Eq, PartialEq)]
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#[serde(rename_all = "lowercase")]
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enum NativeType {
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Void,
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U8,
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I8,
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U16,
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I16,
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U32,
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I32,
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U64,
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I64,
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USize,
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ISize,
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F32,
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F64,
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Buffer,
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}
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impl From<NativeType> for libffi::middle::Type {
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fn from(native_type: NativeType) -> Self {
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match native_type {
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NativeType::Void => libffi::middle::Type::void(),
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NativeType::U8 => libffi::middle::Type::u8(),
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NativeType::I8 => libffi::middle::Type::i8(),
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NativeType::U16 => libffi::middle::Type::u16(),
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NativeType::I16 => libffi::middle::Type::i16(),
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NativeType::U32 => libffi::middle::Type::u32(),
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NativeType::I32 => libffi::middle::Type::i32(),
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NativeType::U64 => libffi::middle::Type::u64(),
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NativeType::I64 => libffi::middle::Type::i64(),
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NativeType::USize => libffi::middle::Type::usize(),
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NativeType::ISize => libffi::middle::Type::isize(),
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NativeType::F32 => libffi::middle::Type::f32(),
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NativeType::F64 => libffi::middle::Type::f64(),
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NativeType::Buffer => libffi::middle::Type::pointer(),
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}
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}
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}
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#[repr(C)]
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union NativeValue {
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void_value: (),
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u8_value: u8,
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i8_value: i8,
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u16_value: u16,
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i16_value: i16,
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u32_value: u32,
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i32_value: i32,
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u64_value: u64,
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i64_value: i64,
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usize_value: usize,
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isize_value: isize,
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f32_value: f32,
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f64_value: f64,
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buffer: *const u8,
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}
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impl NativeValue {
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fn new(native_type: NativeType, value: Value) -> Self {
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match native_type {
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NativeType::Void => Self { void_value: () },
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NativeType::U8 => Self {
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u8_value: value_as_uint::<u8>(value),
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},
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NativeType::I8 => Self {
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i8_value: value_as_int::<i8>(value),
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},
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NativeType::U16 => Self {
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u16_value: value_as_uint::<u16>(value),
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},
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NativeType::I16 => Self {
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i16_value: value_as_int::<i16>(value),
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},
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NativeType::U32 => Self {
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u32_value: value_as_uint::<u32>(value),
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},
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NativeType::I32 => Self {
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i32_value: value_as_int::<i32>(value),
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},
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NativeType::U64 => Self {
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u64_value: value_as_uint::<u64>(value),
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},
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NativeType::I64 => Self {
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i64_value: value_as_int::<i64>(value),
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},
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NativeType::USize => Self {
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usize_value: value_as_uint::<usize>(value),
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},
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NativeType::ISize => Self {
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isize_value: value_as_int::<isize>(value),
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},
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NativeType::F32 => Self {
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f32_value: value_as_f32(value),
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},
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NativeType::F64 => Self {
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f64_value: value_as_f64(value),
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},
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NativeType::Buffer => unreachable!(),
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}
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}
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fn buffer(ptr: *const u8) -> Self {
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Self { buffer: ptr }
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}
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unsafe fn as_arg(&self, native_type: NativeType) -> Arg {
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match native_type {
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NativeType::Void => Arg::new(&self.void_value),
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NativeType::U8 => Arg::new(&self.u8_value),
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NativeType::I8 => Arg::new(&self.i8_value),
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NativeType::U16 => Arg::new(&self.u16_value),
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NativeType::I16 => Arg::new(&self.i16_value),
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NativeType::U32 => Arg::new(&self.u32_value),
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NativeType::I32 => Arg::new(&self.i32_value),
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NativeType::U64 => Arg::new(&self.u64_value),
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NativeType::I64 => Arg::new(&self.i64_value),
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NativeType::USize => Arg::new(&self.usize_value),
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NativeType::ISize => Arg::new(&self.isize_value),
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NativeType::F32 => Arg::new(&self.f32_value),
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NativeType::F64 => Arg::new(&self.f64_value),
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NativeType::Buffer => Arg::new(&self.buffer),
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}
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}
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}
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fn value_as_uint<T: TryFrom<u64>>(value: Value) -> T {
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value
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.as_u64()
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.and_then(|v| T::try_from(v).ok())
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.expect("Expected ffi arg value to be an unsigned integer")
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}
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fn value_as_int<T: TryFrom<i64>>(value: Value) -> T {
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value
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.as_i64()
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.and_then(|v| T::try_from(v).ok())
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.expect("Expected ffi arg value to be a signed integer")
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}
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fn value_as_f32(value: Value) -> f32 {
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value_as_f64(value) as f32
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}
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fn value_as_f64(value: Value) -> f64 {
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value
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.as_f64()
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.expect("Expected ffi arg value to be a float")
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}
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#[derive(Deserialize, Debug)]
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#[serde(rename_all = "camelCase")]
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struct ForeignFunction {
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parameters: Vec<NativeType>,
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result: NativeType,
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}
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#[derive(Deserialize, Debug)]
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struct FfiLoadArgs {
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path: String,
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symbols: HashMap<String, ForeignFunction>,
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}
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// `path` is only used on Windows.
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#[allow(unused_variables)]
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pub(crate) fn format_error(e: dlopen::Error, path: String) -> String {
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match e {
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#[cfg(target_os = "windows")]
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// This calls FormatMessageW with library path
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// as replacement for the insert sequences.
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// Unlike libstd which passes the FORMAT_MESSAGE_IGNORE_INSERTS
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// flag without any arguments.
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//
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// https://github.com/denoland/deno/issues/11632
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dlopen::Error::OpeningLibraryError(e) => {
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use std::ffi::OsStr;
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use std::os::windows::ffi::OsStrExt;
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use winapi::shared::minwindef::DWORD;
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use winapi::shared::winerror::ERROR_INSUFFICIENT_BUFFER;
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use winapi::um::errhandlingapi::GetLastError;
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use winapi::um::winbase::FormatMessageW;
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use winapi::um::winbase::FORMAT_MESSAGE_ARGUMENT_ARRAY;
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use winapi::um::winbase::FORMAT_MESSAGE_FROM_SYSTEM;
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use winapi::um::winnt::LANG_SYSTEM_DEFAULT;
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use winapi::um::winnt::MAKELANGID;
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use winapi::um::winnt::SUBLANG_SYS_DEFAULT;
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let err_num = match e.raw_os_error() {
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Some(err_num) => err_num,
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// This should never hit unless dlopen changes its error type.
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None => return e.to_string(),
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};
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// Language ID (0x0800)
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let lang_id =
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MAKELANGID(LANG_SYSTEM_DEFAULT, SUBLANG_SYS_DEFAULT) as DWORD;
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let mut buf = vec![0; 500];
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let path = OsStr::new(&path)
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.encode_wide()
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.chain(Some(0).into_iter())
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.collect::<Vec<_>>();
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let arguments = [path.as_ptr()];
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loop {
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unsafe {
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let length = FormatMessageW(
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FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ARGUMENT_ARRAY,
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std::ptr::null_mut(),
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err_num as DWORD,
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lang_id as DWORD,
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buf.as_mut_ptr(),
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buf.len() as DWORD,
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arguments.as_ptr() as _,
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);
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if length == 0 {
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let err_num = GetLastError();
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if err_num == ERROR_INSUFFICIENT_BUFFER {
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buf.resize(buf.len() * 2, 0);
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continue;
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}
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// Something went wrong, just return the original error.
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return e.to_string();
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}
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let msg = String::from_utf16_lossy(&buf[..length as usize]);
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return msg;
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}
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}
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}
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_ => e.to_string(),
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}
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}
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fn op_ffi_load<FP>(
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state: &mut deno_core::OpState,
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args: FfiLoadArgs,
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_: (),
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) -> Result<ResourceId, AnyError>
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where
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FP: FfiPermissions + 'static,
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{
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let path = args.path;
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check_unstable(state, "Deno.dlopen");
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let permissions = state.borrow_mut::<FP>();
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permissions.check(&PathBuf::from(&path))?;
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let lib = Library::open(&path).map_err(|e| {
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dlopen::Error::OpeningLibraryError(std::io::Error::new(
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std::io::ErrorKind::Other,
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format_error(e, path),
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))
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})?;
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let mut resource = DynamicLibraryResource {
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lib,
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symbols: HashMap::new(),
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};
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for (symbol, foreign_fn) in args.symbols {
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resource.register(symbol, foreign_fn)?;
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}
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Ok(state.resource_table.add(resource))
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}
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#[derive(Deserialize)]
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#[serde(rename_all = "camelCase")]
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struct FfiCallArgs {
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rid: ResourceId,
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symbol: String,
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parameters: Vec<Value>,
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buffers: Vec<ZeroCopyBuf>,
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}
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fn ffi_call(args: FfiCallArgs, symbol: &Symbol) -> Result<Value, AnyError> {
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let buffers: Vec<&[u8]> =
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args.buffers.iter().map(|buffer| &buffer[..]).collect();
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let native_values = symbol
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.parameter_types
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.iter()
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.zip(args.parameters.into_iter())
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.map(|(&native_type, value)| {
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if let NativeType::Buffer = native_type {
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let idx: usize = value_as_uint(value);
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let ptr = buffers[idx].as_ptr();
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NativeValue::buffer(ptr)
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} else {
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NativeValue::new(native_type, value)
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}
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})
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.collect::<Vec<_>>();
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let call_args = symbol
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.parameter_types
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.iter()
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.zip(native_values.iter())
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.map(|(&native_type, native_value)| unsafe {
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native_value.as_arg(native_type)
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})
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.collect::<Vec<_>>();
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Ok(match symbol.result_type {
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NativeType::Void => {
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json!(unsafe { symbol.cif.call::<()>(symbol.ptr, &call_args) })
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}
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NativeType::U8 => {
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json!(unsafe { symbol.cif.call::<u8>(symbol.ptr, &call_args) })
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}
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NativeType::I8 => {
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json!(unsafe { symbol.cif.call::<i8>(symbol.ptr, &call_args) })
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}
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NativeType::U16 => {
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json!(unsafe { symbol.cif.call::<u16>(symbol.ptr, &call_args) })
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}
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NativeType::I16 => {
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json!(unsafe { symbol.cif.call::<i16>(symbol.ptr, &call_args) })
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}
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NativeType::U32 => {
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json!(unsafe { symbol.cif.call::<u32>(symbol.ptr, &call_args) })
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}
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NativeType::I32 => {
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json!(unsafe { symbol.cif.call::<i32>(symbol.ptr, &call_args) })
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}
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NativeType::U64 => {
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json!(unsafe { symbol.cif.call::<u64>(symbol.ptr, &call_args) })
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}
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NativeType::I64 => {
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json!(unsafe { symbol.cif.call::<i64>(symbol.ptr, &call_args) })
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}
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NativeType::USize => {
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json!(unsafe { symbol.cif.call::<usize>(symbol.ptr, &call_args) })
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}
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NativeType::ISize => {
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json!(unsafe { symbol.cif.call::<isize>(symbol.ptr, &call_args) })
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}
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NativeType::F32 => {
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json!(unsafe { symbol.cif.call::<f32>(symbol.ptr, &call_args) })
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}
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NativeType::F64 => {
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json!(unsafe { symbol.cif.call::<f64>(symbol.ptr, &call_args) })
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}
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NativeType::Buffer => unreachable!(),
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})
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}
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fn op_ffi_call(
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state: &mut deno_core::OpState,
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args: FfiCallArgs,
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_: (),
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) -> Result<Value, AnyError> {
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let resource = state
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.resource_table
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.get::<DynamicLibraryResource>(args.rid)?;
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let symbol = resource
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.symbols
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.get(&args.symbol)
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.ok_or_else(bad_resource_id)?;
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ffi_call(args, symbol)
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}
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/// A non-blocking FFI call.
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async fn op_ffi_call_nonblocking(
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state: Rc<RefCell<deno_core::OpState>>,
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args: FfiCallArgs,
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_: (),
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) -> Result<Value, AnyError> {
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let resource = state
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.borrow()
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.resource_table
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.get::<DynamicLibraryResource>(args.rid)?;
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let symbols = &resource.symbols;
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let symbol = symbols
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.get(&args.symbol)
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.ok_or_else(bad_resource_id)?
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.clone();
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tokio::task::spawn_blocking(move || ffi_call(args, &symbol))
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.await
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.unwrap()
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}
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|
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#[cfg(test)]
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mod tests {
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#[cfg(target_os = "windows")]
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#[test]
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fn test_format_error() {
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use super::format_error;
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|
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// BAD_EXE_FORMAT
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let err = dlopen::Error::OpeningLibraryError(
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std::io::Error::from_raw_os_error(0x000000C1),
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);
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assert_eq!(
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format_error(err, "foo.dll".to_string()),
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|
"foo.dll is not a valid Win32 application.\r\n".to_string(),
|
|
);
|
|
}
|
|
}
|