Custom BIO infrastructure

2 files changed, 142 insertions, 0 deletions

diff --git a/openssl/src/ssl/bio.rs b/openssl/src/ssl/bio.rs
new file mode 100644
index 00000000..92479b37
--- /dev/null
+++ b/openssl/src/ssl/bio.rs
@@ -0,0 +1,141 @@
+use libc::{c_char, c_int, c_long, c_void, strlen};
+use ffi::{BIO, BIO_METHOD, BIO_CTRL_FLUSH, BIO_TYPE_NONE, BIO_new};
+use ffi_extras::{BIO_clear_retry_flags, BIO_set_retry_read, BIO_set_retry_write};
+use std::any::Any;
+use std::io;
+use std::io::prelude::*;
+use std::marker::PhantomData;
+use std::mem;
+use std::slice;
+use std::sync::Mutex;
+use std::ptr;
+
+use ssl::error::SslError;
+
+pub struct StreamState<S> {
+    pub stream: S,
+    pub error: Option<io::Error>,
+}
+
+pub fn new_bio<S: Read + Write>(stream: S) -> Result<(*mut BIO, Box<BIO_METHOD>), SslError> {
+    // "rust"
+    static NAME: [c_char; 5] = [114, 117, 115, 116, 0];
+
+    let method = Box::new(BIO_METHOD {
+        type_: BIO_TYPE_NONE,
+        name: &NAME[0],
+        bwrite: Some(bwrite::<S>),
+        bread: Some(bread::<S>),
+        bputs: Some(bputs::<S>),
+        bgets: None,
+        ctrl: Some(ctrl::<S>),
+        create: Some(create),
+        destroy: Some(destroy),
+        callback_ctrl: None,
+    });
+
+    let state = Box::new(StreamState {
+        stream: stream,
+        error: None,
+    });
+
+    unsafe {
+        let bio = BIO_new(&*method);
+        if bio.is_null() {
+            return Err(SslError::get());
+        }
+
+        (*bio).ptr = Box::into_raw(state) as *mut _;
+
+        return 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_stream<S>(bio: *mut BIO) -> S {
+    let state: Box<StreamState<S>> = Box::from_raw((*bio).ptr as *mut _);
+    (*bio).ptr = ptr::null_mut();
+    state.stream
+}
+
+unsafe fn state<'a, S: 'a>(bio: *mut BIO) -> &'a mut StreamState<S> {
+    mem::transmute((*bio).ptr)
+}
+
+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 state.stream.write(buf) {
+        Ok(len) => len as c_int,
+        Err(err) => {
+            if err.kind() == io::ErrorKind::WouldBlock {
+                BIO_set_retry_write(bio);
+            }
+            state.error = 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 state.stream.read(buf) {
+        Ok(len) => len as c_int,
+        Err(err) => {
+            if err.kind() == io::ErrorKind::WouldBlock {
+                BIO_set_retry_read(bio);
+            }
+            state.error = Some(err);
+            -1
+        }
+    }
+}
+
+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 {
+    if cmd == BIO_CTRL_FLUSH {
+        let state = state::<S>(bio);
+        match state.stream.flush() {
+            Ok(()) => 1,
+            Err(err) => {
+                state.error = Some(err);
+                0
+            }
+        }
+    } else {
+        0
+    }
+}
+
+unsafe extern "C" fn create(bio: *mut BIO) -> c_int {
+    (*bio).init = 0;
+    (*bio).num = 0;
+    (*bio).ptr = ptr::null_mut();
+    (*bio).flags = 0;
+    1
+}
+
+unsafe extern "C" fn destroy(bio: *mut BIO) -> c_int {
+    if bio.is_null() {
+        return 0;
+    }
+
+    assert!((*bio).ptr.is_null());
+    1
+}
diff --git a/openssl/src/ssl/mod.rs b/openssl/src/ssl/mod.rs
index a26b714a..2f09e4fa 100644
--- a/openssl/src/ssl/mod.rs
+++ b/openssl/src/ssl/mod.rs
@@ -28,6 +28,7 @@ use x509::{X509StoreContext, X509FileType, X509};
 use crypto::pkey::PKey;
 
 pub mod error;
+mod bio;
 #[cfg(test)]
 mod tests;