1use cfg_if::cfg_if;
2use ffi::{
3 self, BIO_clear_retry_flags, BIO_new, BIO_set_retry_read, BIO_set_retry_write, BIO,
4 BIO_CTRL_DGRAM_QUERY_MTU, BIO_CTRL_FLUSH,
5};
6use libc::{c_char, c_int, c_long, c_void, strlen};
7use std::any::Any;
8use std::io;
9use std::io::prelude::*;
10use std::panic::{catch_unwind, AssertUnwindSafe};
11use std::ptr;
12
13use crate::error::ErrorStack;
14use crate::{cvt_p, util};
15
16pub struct StreamState<S> {
17 pub stream: S,
18 pub error: Option<io::Error>,
19 pub panic: Option<Box<dyn Any + Send>>,
20 pub dtls_mtu_size: c_long,
21}
22
23/// Safe wrapper for `BIO_METHOD`
24pub struct BioMethod(BIO_METHOD);
25
26impl BioMethod {
27 fn new<S: Read + Write>() -> Result<BioMethod, ErrorStack> {
28 BIO_METHOD::new::<S>().map(op:BioMethod)
29 }
30}
31
32unsafe impl Sync for BioMethod {}
33unsafe impl Send for BioMethod {}
34
35pub fn new<S: Read + Write>(stream: S) -> Result<(*mut BIO, BioMethod), ErrorStack> {
36 let method: BioMethod = BioMethod::new::<S>()?;
37
38 let state: Box> = Box::new(StreamState {
39 stream,
40 error: None,
41 panic: None,
42 dtls_mtu_size: 0,
43 });
44
45 unsafe {
46 let bio: *mut BIO = cvt_p(BIO_new(type_:method.0.get()))?;
47 BIO_set_data(a:bio, data:Box::into_raw(state) as *mut _);
48 BIO_set_init(a:bio, init:1);
49
50 Ok((bio, method))
51 }
52}
53
54pub unsafe fn take_error<S>(bio: *mut BIO) -> Option<io::Error> {
55 let state: &mut StreamState = state::<S>(bio);
56 state.error.take()
57}
58
59pub unsafe fn take_panic<S>(bio: *mut BIO) -> Option<Box<dyn Any + Send>> {
60 let state: &mut StreamState = state::<S>(bio);
61 state.panic.take()
62}
63
64pub unsafe fn get_ref<'a, S: 'a>(bio: *mut BIO) -> &'a S {
65 let state: &StreamState = &*(BIO_get_data(bio) as *const StreamState<S>);
66 &state.stream
67}
68
69pub unsafe fn get_mut<'a, S: 'a>(bio: *mut BIO) -> &'a mut S {
70 &mut state(bio).stream
71}
72
73pub unsafe fn set_dtls_mtu_size<S>(bio: *mut BIO, mtu_size: usize) {
74 if mtu_size as u64 > c_long::MAX as u64 {
75 panic!(
76 "Given MTU size {} can't be represented in a positive `c_long` range",
77 mtu_size
78 )
79 }
80 state::<S>(bio).dtls_mtu_size = mtu_size as c_long;
81}
82
83unsafe fn state<'a, S: 'a>(bio: *mut BIO) -> &'a mut StreamState<S> {
84 &mut *(BIO_get_data(bio) as *mut _)
85}
86
87unsafe extern "C" fn bwrite<S: Write>(bio: *mut BIO, buf: *const c_char, len: c_int) -> c_int {
88 BIO_clear_retry_flags(bio);
89
90 let state: &mut StreamState = state::<S>(bio);
91 let buf: &[u8] = util::from_raw_parts(data:buf as *const _, len as usize);
92
93 match catch_unwind(AssertUnwindSafe(|| state.stream.write(buf))) {
94 Ok(Ok(len: usize)) => len as c_int,
95 Ok(Err(err: Error)) => {
96 if retriable_error(&err) {
97 BIO_set_retry_write(bio);
98 }
99 state.error = Some(err);
100 -1
101 }
102 Err(err: Box) => {
103 state.panic = Some(err);
104 -1
105 }
106 }
107}
108
109unsafe extern "C" fn bread<S: Read>(bio: *mut BIO, buf: *mut c_char, len: c_int) -> c_int {
110 BIO_clear_retry_flags(bio);
111
112 let state: &mut StreamState = state::<S>(bio);
113 let buf: &mut [u8] = util::from_raw_parts_mut(data:buf as *mut _, len as usize);
114
115 match catch_unwind(AssertUnwindSafe(|| state.stream.read(buf))) {
116 Ok(Ok(len: usize)) => len as c_int,
117 Ok(Err(err: Error)) => {
118 if retriable_error(&err) {
119 BIO_set_retry_read(bio);
120 }
121 state.error = Some(err);
122 -1
123 }
124 Err(err: Box) => {
125 state.panic = Some(err);
126 -1
127 }
128 }
129}
130
131#[allow(clippy::match_like_matches_macro)] // matches macro requires rust 1.42.0
132fn retriable_error(err: &io::Error) -> bool {
133 match err.kind() {
134 io::ErrorKind::WouldBlock | io::ErrorKind::NotConnected => true,
135 _ => false,
136 }
137}
138
139unsafe extern "C" fn bputs<S: Write>(bio: *mut BIO, s: *const c_char) -> c_int {
140 bwrite::<S>(bio, buf:s, len:strlen(cs:s) as c_int)
141}
142
143unsafe extern "C" fn ctrl<S: Write>(
144 bio: *mut BIO,
145 cmd: c_int,
146 _num: c_long,
147 _ptr: *mut c_void,
148) -> c_long {
149 let state: &mut StreamState = state::<S>(bio);
150
151 if cmd == BIO_CTRL_FLUSH {
152 match catch_unwind(AssertUnwindSafe(|| state.stream.flush())) {
153 Ok(Ok(())) => 1,
154 Ok(Err(err: Error)) => {
155 state.error = Some(err);
156 0
157 }
158 Err(err: Box) => {
159 state.panic = Some(err);
160 0
161 }
162 }
163 } else if cmd == BIO_CTRL_DGRAM_QUERY_MTU {
164 state.dtls_mtu_size
165 } else {
166 0
167 }
168}
169
170unsafe extern "C" fn create(bio: *mut BIO) -> c_int {
171 BIO_set_init(a:bio, init:0);
172 BIO_set_num(bio, _num:0);
173 BIO_set_data(a:bio, data:ptr::null_mut());
174 BIO_set_flags(b:bio, flags:0);
175 1
176}
177
178unsafe extern "C" fn destroy<S>(bio: *mut BIO) -> c_int {
179 if bio.is_null() {
180 return 0;
181 }
182
183 let data: *mut c_void = BIO_get_data(bio);
184 assert!(!data.is_null());
185 let _ = Box::<StreamState<S>>::from_raw(data as *mut _);
186 BIO_set_data(a:bio, data:ptr::null_mut());
187 BIO_set_init(a:bio, init:0);
188 1
189}
190
191cfg_if! {
192 if #[cfg(any(ossl110, libressl273))] {
193 use ffi::{BIO_get_data, BIO_set_data, BIO_set_flags, BIO_set_init};
194 use crate::cvt;
195
196 #[allow(bad_style)]
197 unsafe fn BIO_set_num(_bio: *mut ffi::BIO, _num: c_int) {}
198
199 #[allow(bad_style, clippy::upper_case_acronyms)]
200 struct BIO_METHOD(*mut ffi::BIO_METHOD);
201
202 impl BIO_METHOD {
203 fn new<S: Read + Write>() -> Result<BIO_METHOD, ErrorStack> {
204 unsafe {
205 let ptr = cvt_p(ffi::BIO_meth_new(ffi::BIO_TYPE_NONE, b"rust\0".as_ptr() as *const _))?;
206 let method = BIO_METHOD(ptr);
207 cvt(ffi::BIO_meth_set_write__fixed_rust(method.0, Some(bwrite::<S>)))?;
208 cvt(ffi::BIO_meth_set_read__fixed_rust(method.0, Some(bread::<S>)))?;
209 cvt(ffi::BIO_meth_set_puts__fixed_rust(method.0, Some(bputs::<S>)))?;
210 cvt(ffi::BIO_meth_set_ctrl__fixed_rust(method.0, Some(ctrl::<S>)))?;
211 cvt(ffi::BIO_meth_set_create__fixed_rust(method.0, Some(create)))?;
212 cvt(ffi::BIO_meth_set_destroy__fixed_rust(method.0, Some(destroy::<S>)))?;
213 Ok(method)
214 }
215 }
216
217 fn get(&self) -> *mut ffi::BIO_METHOD {
218 self.0
219 }
220 }
221
222 impl Drop for BIO_METHOD {
223 fn drop(&mut self) {
224 unsafe {
225 ffi::BIO_meth_free(self.0);
226 }
227 }
228 }
229 } else {
230 #[allow(bad_style, clippy::upper_case_acronyms)]
231 struct BIO_METHOD(*mut ffi::BIO_METHOD);
232
233 impl BIO_METHOD {
234 fn new<S: Read + Write>() -> Result<BIO_METHOD, ErrorStack> {
235 let ptr = Box::new(ffi::BIO_METHOD {
236 type_: ffi::BIO_TYPE_NONE,
237 name: b"rust\0".as_ptr() as *const _,
238 bwrite: Some(bwrite::<S>),
239 bread: Some(bread::<S>),
240 bputs: Some(bputs::<S>),
241 bgets: None,
242 ctrl: Some(ctrl::<S>),
243 create: Some(create),
244 destroy: Some(destroy::<S>),
245 callback_ctrl: None,
246 });
247
248 Ok(BIO_METHOD(Box::into_raw(ptr)))
249 }
250
251 fn get(&self) -> *mut ffi::BIO_METHOD {
252 self.0
253 }
254 }
255
256 impl Drop for BIO_METHOD {
257 fn drop(&mut self) {
258 unsafe {
259 let _ = Box::<ffi::BIO_METHOD>::from_raw(self.0);
260 }
261 }
262 }
263
264 #[allow(bad_style)]
265 unsafe fn BIO_set_init(bio: *mut ffi::BIO, init: c_int) {
266 (*bio).init = init;
267 }
268
269 #[allow(bad_style)]
270 unsafe fn BIO_set_flags(bio: *mut ffi::BIO, flags: c_int) {
271 (*bio).flags = flags;
272 }
273
274 #[allow(bad_style)]
275 unsafe fn BIO_get_data(bio: *mut ffi::BIO) -> *mut c_void {
276 (*bio).ptr
277 }
278
279 #[allow(bad_style)]
280 unsafe fn BIO_set_data(bio: *mut ffi::BIO, data: *mut c_void) {
281 (*bio).ptr = data;
282 }
283
284 #[allow(bad_style)]
285 unsafe fn BIO_set_num(bio: *mut ffi::BIO, num: c_int) {
286 (*bio).num = num;
287 }
288 }
289}
290