use cfg_if::cfg_if;
use ffi::{
self, BIO_clear_retry_flags, BIO_new, BIO_set_retry_read, BIO_set_retry_write, BIO,
BIO_CTRL_DGRAM_QUERY_MTU, BIO_CTRL_FLUSH,
};
use libc::{c_char, c_int, c_long, c_void, strlen};
use std::any::Any;
use std::io;
use std::io::prelude::*;
use std::panic::{catch_unwind, AssertUnwindSafe};
use std::ptr;
use std::slice;
use crate::cvt_p;
use crate::error::ErrorStack;
pub struct StreamState<S> {
pub stream: S,
pub error: Option<io::Error>,
pub panic: Option<Box<dyn Any + Send>>,
pub dtls_mtu_size: c_long,
}
pub struct BioMethod(BIO_METHOD);
impl BioMethod {
fn new<S: Read + Write>() -> Result<BioMethod, ErrorStack> {
BIO_METHOD::new::<S>().map(BioMethod)
}
}
unsafe impl Sync for BioMethod {}
unsafe impl Send for BioMethod {}
pub fn new<S: Read + Write>(stream: S) -> Result<(*mut BIO, BioMethod), ErrorStack> {
let method = BioMethod::new::<S>()?;
let state = Box::new(StreamState {
stream,
error: None,
panic: None,
dtls_mtu_size: 0,
});
unsafe {
let bio = cvt_p(BIO_new(method.0.get()))?;
BIO_set_data(bio, Box::into_raw(state) as *mut _);
BIO_set_init(bio, 1);
Ok((bio, method))
}
}
pub unsafe fn take_error<S>(bio: *mut BIO) -> Option<io::Error> {
let state = state::<S>(bio);
state.error.take()
}
pub unsafe fn take_panic<S>(bio: *mut BIO) -> Option<Box<dyn Any + Send>> {
let state = state::<S>(bio);
state.panic.take()
}
pub unsafe fn get_ref<'a, S: 'a>(bio: *mut BIO) -> &'a S {
let state = &*(BIO_get_data(bio) as *const StreamState<S>);
&state.stream
}
pub unsafe fn get_mut<'a, S: 'a>(bio: *mut BIO) -> &'a mut S {
&mut state(bio).stream
}
pub unsafe fn set_dtls_mtu_size<S>(bio: *mut BIO, mtu_size: usize) {
if mtu_size as u64 > c_long::max_value() as u64 {
panic!(
"Given MTU size {} can't be represented in a positive `c_long` range",
mtu_size
)
}
state::<S>(bio).dtls_mtu_size = mtu_size as c_long;
}
unsafe fn state<'a, S: 'a>(bio: *mut BIO) -> &'a mut StreamState<S> {
&mut *(BIO_get_data(bio) as *mut _)
}
unsafe extern "C" fn bwrite<S: Write>(bio: *mut BIO, buf: *const c_char, len: c_int) -> c_int {
BIO_clear_retry_flags(bio);
let state = state::<S>(bio);
let buf = slice::from_raw_parts(buf as *const _, len as usize);
match catch_unwind(AssertUnwindSafe(|| state.stream.write(buf))) {
Ok(Ok(len)) => len as c_int,
Ok(Err(err)) => {
if retriable_error(&err) {
BIO_set_retry_write(bio);
}
state.error = Some(err);
-1
}
Err(err) => {
state.panic = Some(err);
-1
}
}
}
unsafe extern "C" fn bread<S: Read>(bio: *mut BIO, buf: *mut c_char, len: c_int) -> c_int {
BIO_clear_retry_flags(bio);
let state = state::<S>(bio);
let buf = slice::from_raw_parts_mut(buf as *mut _, len as usize);
match catch_unwind(AssertUnwindSafe(|| state.stream.read(buf))) {
Ok(Ok(len)) => len as c_int,
Ok(Err(err)) => {
if retriable_error(&err) {
BIO_set_retry_read(bio);
}
state.error = Some(err);
-1
}
Err(err) => {
state.panic = Some(err);
-1
}
}
}
#[allow(clippy::match_like_matches_macro)] fn retriable_error(err: &io::Error) -> bool {
match err.kind() {
io::ErrorKind::WouldBlock | io::ErrorKind::NotConnected => true,
_ => false,
}
}
unsafe extern "C" fn bputs<S: Write>(bio: *mut BIO, s: *const c_char) -> c_int {
bwrite::<S>(bio, s, strlen(s) as c_int)
}
unsafe extern "C" fn ctrl<S: Write>(
bio: *mut BIO,
cmd: c_int,
_num: c_long,
_ptr: *mut c_void,
) -> c_long {
let state = state::<S>(bio);
if cmd == BIO_CTRL_FLUSH {
match catch_unwind(AssertUnwindSafe(|| state.stream.flush())) {
Ok(Ok(())) => 1,
Ok(Err(err)) => {
state.error = Some(err);
0
}
Err(err) => {
state.panic = Some(err);
0
}
}
} else if cmd == BIO_CTRL_DGRAM_QUERY_MTU {
state.dtls_mtu_size
} else {
0
}
}
unsafe extern "C" fn create(bio: *mut BIO) -> c_int {
BIO_set_init(bio, 0);
BIO_set_num(bio, 0);
BIO_set_data(bio, ptr::null_mut());
BIO_set_flags(bio, 0);
1
}
unsafe extern "C" fn destroy<S>(bio: *mut BIO) -> c_int {
if bio.is_null() {
return 0;
}
let data = BIO_get_data(bio);
assert!(!data.is_null());
let _ = Box::<StreamState<S>>::from_raw(data as *mut _);
BIO_set_data(bio, ptr::null_mut());
BIO_set_init(bio, 0);
1
}
cfg_if! {
if #[cfg(any(ossl110, libressl273))] {
use ffi::{BIO_get_data, BIO_set_data, BIO_set_flags, BIO_set_init};
use crate::cvt;
#[allow(bad_style)]
unsafe fn BIO_set_num(_bio: *mut ffi::BIO, _num: c_int) {}
#[allow(bad_style, clippy::upper_case_acronyms)]
struct BIO_METHOD(*mut ffi::BIO_METHOD);
impl BIO_METHOD {
fn new<S: Read + Write>() -> Result<BIO_METHOD, ErrorStack> {
unsafe {
let ptr = cvt_p(ffi::BIO_meth_new(ffi::BIO_TYPE_NONE, b"rust\0".as_ptr() as *const _))?;
let method = BIO_METHOD(ptr);
cvt(ffi::BIO_meth_set_write__fixed_rust(method.0, Some(bwrite::<S>)))?;
cvt(ffi::BIO_meth_set_read__fixed_rust(method.0, Some(bread::<S>)))?;
cvt(ffi::BIO_meth_set_puts__fixed_rust(method.0, Some(bputs::<S>)))?;
cvt(ffi::BIO_meth_set_ctrl__fixed_rust(method.0, Some(ctrl::<S>)))?;
cvt(ffi::BIO_meth_set_create__fixed_rust(method.0, Some(create)))?;
cvt(ffi::BIO_meth_set_destroy__fixed_rust(method.0, Some(destroy::<S>)))?;
Ok(method)
}
}
fn get(&self) -> *mut ffi::BIO_METHOD {
self.0
}
}
impl Drop for BIO_METHOD {
fn drop(&mut self) {
unsafe {
ffi::BIO_meth_free(self.0);
}
}
}
} else {
#[allow(bad_style, clippy::upper_case_acronyms)]
struct BIO_METHOD(*mut ffi::BIO_METHOD);
impl BIO_METHOD {
fn new<S: Read + Write>() -> Result<BIO_METHOD, ErrorStack> {
let ptr = Box::new(ffi::BIO_METHOD {
type_: ffi::BIO_TYPE_NONE,
name: b"rust\0".as_ptr() as *const _,
bwrite: Some(bwrite::<S>),
bread: Some(bread::<S>),
bputs: Some(bputs::<S>),
bgets: None,
ctrl: Some(ctrl::<S>),
create: Some(create),
destroy: Some(destroy::<S>),
callback_ctrl: None,
});
Ok(BIO_METHOD(Box::into_raw(ptr)))
}
fn get(&self) -> *mut ffi::BIO_METHOD {
self.0
}
}
impl Drop for BIO_METHOD {
fn drop(&mut self) {
unsafe {
let _ = Box::<ffi::BIO_METHOD>::from_raw(self.0);
}
}
}
#[allow(bad_style)]
unsafe fn BIO_set_init(bio: *mut ffi::BIO, init: c_int) {
(*bio).init = init;
}
#[allow(bad_style)]
unsafe fn BIO_set_flags(bio: *mut ffi::BIO, flags: c_int) {
(*bio).flags = flags;
}
#[allow(bad_style)]
unsafe fn BIO_get_data(bio: *mut ffi::BIO) -> *mut c_void {
(*bio).ptr
}
#[allow(bad_style)]
unsafe fn BIO_set_data(bio: *mut ffi::BIO, data: *mut c_void) {
(*bio).ptr = data;
}
#[allow(bad_style)]
unsafe fn BIO_set_num(bio: *mut ffi::BIO, num: c_int) {
(*bio).num = num;
}
}
}