min
/
boring2
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Move callbacks to a submodule

This commit is contained in:
Steven Fackler 2017-07-15 15:04:24 -07:00
parent 9290ed97c2
commit e3c7a2785c
2 changed files with 341 additions and 298 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

337
openssl/src/ssl/callbacks.rs Normal file
View File

@ -0,0 +1,337 @@
use ffi;
use libc::{c_int, c_uint, c_char, c_uchar, c_void};
use std::any::Any;
use std::ffi::CStr;
use std::ptr;
use std::slice;
use std::mem;
use foreign_types::ForeignTypeRef;
use error::ErrorStack;
use dh::Dh;
use ssl::{get_callback_idx, get_ssl_callback_idx, SslRef, SniError, NPN_PROTOS_IDX};
#[cfg(any(all(feature = "v102", ossl102), all(feature = "v110", ossl110)))]
use ssl::ALPN_PROTOS_IDX;
use x509::X509StoreContextRef;
pub extern "C" fn raw_verify<F>(preverify_ok: c_int, x509_ctx: *mut ffi::X509_STORE_CTX) -> c_int
where
F: Fn(bool, &X509StoreContextRef) -> bool + Any + 'static + Sync + Send,
{
unsafe {
let idx = ffi::SSL_get_ex_data_X509_STORE_CTX_idx();
let ssl = ffi::X509_STORE_CTX_get_ex_data(x509_ctx, idx);
let ssl_ctx = ffi::SSL_get_SSL_CTX(ssl as *const _);
let verify = ffi::SSL_CTX_get_ex_data(ssl_ctx, get_callback_idx::<F>());
let verify: &F = &*(verify as *mut F);
let ctx = X509StoreContextRef::from_ptr(x509_ctx);
verify(preverify_ok != 0, ctx) as c_int
}
}
#[cfg(not(osslconf = "OPENSSL_NO_PSK"))]
pub extern "C" fn raw_psk<F>(
ssl: *mut ffi::SSL,
hint: *const c_char,
identity: *mut c_char,
max_identity_len: c_uint,
psk: *mut c_uchar,
max_psk_len: c_uint,
) -> c_uint
where
F: Fn(&mut SslRef, Option<&[u8]>, &mut [u8], &mut [u8]) -> Result<usize, ErrorStack>
+ Any
+ 'static
+ Sync
+ Send,
{
unsafe {
let ssl_ctx = ffi::SSL_get_SSL_CTX(ssl as *const _);
let callback = ffi::SSL_CTX_get_ex_data(ssl_ctx, get_callback_idx::<F>());
let ssl = SslRef::from_ptr_mut(ssl);
let callback = &*(callback as *mut F);
let hint = if hint != ptr::null() {
Some(CStr::from_ptr(hint).to_bytes())
} else {
None
};
// Give the callback mutable slices into which it can write the identity and psk.
let identity_sl = slice::from_raw_parts_mut(identity as *mut u8, max_identity_len as usize);
let psk_sl = slice::from_raw_parts_mut(psk as *mut u8, max_psk_len as usize);
match callback(ssl, hint, identity_sl, psk_sl) {
Ok(psk_len) => psk_len as u32,
_ => 0,
}
}
}
pub extern "C" fn ssl_raw_verify<F>(
preverify_ok: c_int,
x509_ctx: *mut ffi::X509_STORE_CTX,
) -> c_int
where
F: Fn(bool, &X509StoreContextRef) -> bool + Any + 'static + Sync + Send,
{
unsafe {
let idx = ffi::SSL_get_ex_data_X509_STORE_CTX_idx();
let ssl = ffi::X509_STORE_CTX_get_ex_data(x509_ctx, idx);
let verify = ffi::SSL_get_ex_data(ssl as *const _, get_ssl_callback_idx::<F>());
let verify: &F = &*(verify as *mut F);
let ctx = X509StoreContextRef::from_ptr(x509_ctx);
verify(preverify_ok != 0, ctx) as c_int
}
}
pub extern "C" fn raw_sni<F>(ssl: *mut ffi::SSL, al: *mut c_int, _arg: *mut c_void) -> c_int
where
F: Fn(&mut SslRef) -> Result<(), SniError> + Any + 'static + Sync + Send,
{
unsafe {
let ssl_ctx = ffi::SSL_get_SSL_CTX(ssl);
let callback = ffi::SSL_CTX_get_ex_data(ssl_ctx, get_callback_idx::<F>());
let callback: &F = &*(callback as *mut F);
let ssl = SslRef::from_ptr_mut(ssl);
match callback(ssl) {
Ok(()) => ffi::SSL_TLSEXT_ERR_OK,
Err(SniError::Fatal(e)) => {
*al = e;
ffi::SSL_TLSEXT_ERR_ALERT_FATAL
}
Err(SniError::Warning(e)) => {
*al = e;
ffi::SSL_TLSEXT_ERR_ALERT_WARNING
}
Err(SniError::NoAck) => ffi::SSL_TLSEXT_ERR_NOACK,
}
}
}
pub unsafe fn select_proto_using(
ssl: *mut ffi::SSL,
out: *mut *mut c_uchar,
outlen: *mut c_uchar,
inbuf: *const c_uchar,
inlen: c_uint,
ex_data: c_int,
) -> c_int {
// First, get the list of protocols (that the client should support) saved in the context
// extra data.
let ssl_ctx = ffi::SSL_get_SSL_CTX(ssl);
let protocols = ffi::SSL_CTX_get_ex_data(ssl_ctx, ex_data);
let protocols: &Vec<u8> = &*(protocols as *mut Vec<u8>);
// Prepare the client list parameters to be passed to the OpenSSL function...
let client = protocols.as_ptr();
let client_len = protocols.len() as c_uint;
// Finally, let OpenSSL find a protocol to be used, by matching the given server and
// client lists.
if ffi::SSL_select_next_proto(out, outlen, inbuf, inlen, client, client_len) !=
ffi::OPENSSL_NPN_NEGOTIATED
{
ffi::SSL_TLSEXT_ERR_NOACK
} else {
ffi::SSL_TLSEXT_ERR_OK
}
}
/// The function is given as the callback to `SSL_CTX_set_next_proto_select_cb`.
///
/// It chooses the protocol that the client wishes to use, out of the given list of protocols
/// supported by the server. It achieves this by delegating to the `SSL_select_next_proto`
/// function. The list of protocols supported by the client is found in the extra data of the
/// OpenSSL context.
pub extern "C" fn raw_next_proto_select_cb(
ssl: *mut ffi::SSL,
out: *mut *mut c_uchar,
outlen: *mut c_uchar,
inbuf: *const c_uchar,
inlen: c_uint,
_arg: *mut c_void,
) -> c_int {
unsafe { select_proto_using(ssl, out, outlen, inbuf, inlen, *NPN_PROTOS_IDX) }
}
#[cfg(any(all(feature = "v102", ossl102), all(feature = "v110", ossl110)))]
pub extern "C" fn raw_alpn_select_cb(
ssl: *mut ffi::SSL,
out: *mut *const c_uchar,
outlen: *mut c_uchar,
inbuf: *const c_uchar,
inlen: c_uint,
_arg: *mut c_void,
) -> c_int {
unsafe { select_proto_using(ssl, out as *mut _, outlen, inbuf, inlen, *ALPN_PROTOS_IDX) }
}
pub unsafe extern "C" fn raw_tmp_dh<F>(
ssl: *mut ffi::SSL,
is_export: c_int,
keylength: c_int,
) -> *mut ffi::DH
where
F: Fn(&mut SslRef, bool, u32) -> Result<Dh, ErrorStack> + Any + 'static + Sync + Send,
{
let ctx = ffi::SSL_get_SSL_CTX(ssl);
let callback = ffi::SSL_CTX_get_ex_data(ctx, get_callback_idx::<F>());
let callback = &*(callback as *mut F);
let ssl = SslRef::from_ptr_mut(ssl);
match callback(ssl, is_export != 0, keylength as u32) {
Ok(dh) => {
let ptr = dh.as_ptr();
mem::forget(dh);
ptr
}
Err(_) => {
// FIXME reset error stack
ptr::null_mut()
}
}
}
#[cfg(any(all(feature = "v101", ossl101), all(feature = "v102", ossl102)))]
pub unsafe extern "C" fn raw_tmp_ecdh<F>(
ssl: *mut ffi::SSL,
is_export: c_int,
keylength: c_int,
) -> *mut ffi::EC_KEY
where
F: Fn(&mut SslRef, bool, u32) -> Result<EcKey, ErrorStack> + Any + 'static + Sync + Send,
{
let ctx = ffi::SSL_get_SSL_CTX(ssl);
let callback = ffi::SSL_CTX_get_ex_data(ctx, get_callback_idx::<F>());
let callback = &*(callback as *mut F);
let ssl = SslRef::from_ptr_mut(ssl);
match callback(ssl, is_export != 0, keylength as u32) {
Ok(ec_key) => {
let ptr = ec_key.as_ptr();
mem::forget(ec_key);
ptr
}
Err(_) => {
// FIXME reset error stack
ptr::null_mut()
}
}
}
pub unsafe extern "C" fn raw_tmp_dh_ssl<F>(
ssl: *mut ffi::SSL,
is_export: c_int,
keylength: c_int,
) -> *mut ffi::DH
where
F: Fn(&mut SslRef, bool, u32) -> Result<Dh, ErrorStack> + Any + 'static + Sync + Send,
{
let callback = ffi::SSL_get_ex_data(ssl, get_ssl_callback_idx::<F>());
let callback = &*(callback as *mut F);
let ssl = SslRef::from_ptr_mut(ssl);
match callback(ssl, is_export != 0, keylength as u32) {
Ok(dh) => {
let ptr = dh.as_ptr();
mem::forget(dh);
ptr
}
Err(_) => {
// FIXME reset error stack
ptr::null_mut()
}
}
}
#[cfg(any(all(feature = "v101", ossl101), all(feature = "v102", ossl102)))]
pub unsafe extern "C" fn raw_tmp_ecdh_ssl<F>(
ssl: *mut ffi::SSL,
is_export: c_int,
keylength: c_int,
) -> *mut ffi::EC_KEY
where
F: Fn(&mut SslRef, bool, u32) -> Result<EcKey, ErrorStack> + Any + 'static + Sync + Send,
{
let callback = ffi::SSL_get_ex_data(ssl, get_ssl_callback_idx::<F>());
let callback = &*(callback as *mut F);
let ssl = SslRef::from_ptr_mut(ssl);
match callback(ssl, is_export != 0, keylength as u32) {
Ok(ec_key) => {
let ptr = ec_key.as_ptr();
mem::forget(ec_key);
ptr
}
Err(_) => {
// FIXME reset error stack
ptr::null_mut()
}
}
}
pub unsafe extern "C" fn raw_tlsext_status<F>(ssl: *mut ffi::SSL, _: *mut c_void) -> c_int
where
F: Fn(&mut SslRef) -> Result<bool, ErrorStack> + Any + 'static + Sync + Send,
{
let ssl_ctx = ffi::SSL_get_SSL_CTX(ssl as *const _);
let callback = ffi::SSL_CTX_get_ex_data(ssl_ctx, get_callback_idx::<F>());
let callback = &*(callback as *mut F);
let ssl = SslRef::from_ptr_mut(ssl);
let ret = callback(ssl);
if ssl.is_server() {
match ret {
Ok(true) => ffi::SSL_TLSEXT_ERR_OK,
Ok(false) => ffi::SSL_TLSEXT_ERR_NOACK,
Err(_) => {
// FIXME reset error stack
ffi::SSL_TLSEXT_ERR_ALERT_FATAL
}
}
} else {
match ret {
Ok(true) => 1,
Ok(false) => 0,
Err(_) => {
// FIXME reset error stack
-1
}
}
}
}
/// The function is given as the callback to `SSL_CTX_set_next_protos_advertised_cb`.
///
/// It causes the parameter `out` to point at a `*const c_uchar` instance that
/// represents the list of protocols that the server should advertise as those
/// that it supports.
/// The list of supported protocols is found in the extra data of the OpenSSL
/// context.
pub extern "C" fn raw_next_protos_advertise_cb(
ssl: *mut ffi::SSL,
out: *mut *const c_uchar,
outlen: *mut c_uint,
_arg: *mut c_void,
) -> c_int {
unsafe {
// First, get the list of (supported) protocols saved in the context extra data.
let ssl_ctx = ffi::SSL_get_SSL_CTX(ssl);
let protocols = ffi::SSL_CTX_get_ex_data(ssl_ctx, *NPN_PROTOS_IDX);
if protocols.is_null() {
*out = b"".as_ptr();
*outlen = 0;
} else {
// If the pointer is valid, put the pointer to the actual byte array into the
// output parameter `out`, as well as its length into `outlen`.
let protocols: &Vec<u8> = &*(protocols as *mut Vec<u8>);
*out = protocols.as_ptr();
*outlen = protocols.len() as c_uint;
}
}
ffi::SSL_TLSEXT_ERR_OK
}

302
openssl/src/ssl/mod.rs
View File

@ -73,7 +73,7 @@
use ffi;
use foreign_types::{ForeignType, ForeignTypeRef};
use libc::{c_int, c_void, c_long, c_ulong};
use libc::{c_char, c_uchar, c_uint};
use libc::{c_uchar, c_uint};
use std::any::Any;
use std::any::TypeId;
use std::borrow::Borrow;
@ -110,12 +110,14 @@ use util::Opaque;
use stack::{Stack, StackRef};
mod error;
mod callbacks;
mod connector;
mod bio;
#[cfg(test)]
mod tests;
use self::bio::BioMethod;
use ssl::bio::BioMethod;
use ssl::callbacks::*;
pub use ssl::connector::{SslConnectorBuilder, SslConnector, SslAcceptorBuilder, SslAcceptor,
ConnectConfiguration};
@ -301,302 +303,6 @@ fn get_new_ssl_idx<T>() -> c_int {
}
}
extern "C" fn raw_verify<F>(preverify_ok: c_int, x509_ctx: *mut ffi::X509_STORE_CTX) -> c_int
where F: Fn(bool, &X509StoreContextRef) -> bool + Any + 'static + Sync + Send
{
unsafe {
let idx = ffi::SSL_get_ex_data_X509_STORE_CTX_idx();
let ssl = ffi::X509_STORE_CTX_get_ex_data(x509_ctx, idx);
let ssl_ctx = ffi::SSL_get_SSL_CTX(ssl as *const _);
let verify = ffi::SSL_CTX_get_ex_data(ssl_ctx, get_callback_idx::<F>());
let verify: &F = &*(verify as *mut F);
let ctx = X509StoreContextRef::from_ptr(x509_ctx);
verify(preverify_ok != 0, ctx) as c_int
}
}
#[cfg(not(osslconf = "OPENSSL_NO_PSK"))]
extern "C" fn raw_psk<F>(ssl: *mut ffi::SSL,
hint: *const c_char,
identity: *mut c_char,
max_identity_len: c_uint,
psk: *mut c_uchar,
max_psk_len: c_uint) -> c_uint
where F: Fn(&mut SslRef, Option<&[u8]>, &mut [u8], &mut [u8]) -> Result<usize, ErrorStack> + Any + 'static + Sync + Send
{
unsafe {
let ssl_ctx = ffi::SSL_get_SSL_CTX(ssl as *const _);
let callback = ffi::SSL_CTX_get_ex_data(ssl_ctx, get_callback_idx::<F>());
let ssl = SslRef::from_ptr_mut(ssl);
let callback = &*(callback as *mut F);
let hint = if hint != ptr::null() {
Some(CStr::from_ptr(hint).to_bytes())
} else {
None
};
// Give the callback mutable slices into which it can write the identity and psk.
let identity_sl = slice::from_raw_parts_mut(identity as *mut u8,
max_identity_len as usize);
let psk_sl = slice::from_raw_parts_mut(psk as *mut u8, max_psk_len as usize);
match callback(ssl, hint, identity_sl, psk_sl) {
Ok(psk_len) => psk_len as u32,
_ => 0,
}
}
}
extern "C" fn ssl_raw_verify<F>(preverify_ok: c_int, x509_ctx: *mut ffi::X509_STORE_CTX) -> c_int
where F: Fn(bool, &X509StoreContextRef) -> bool + Any + 'static + Sync + Send
{
unsafe {
let idx = ffi::SSL_get_ex_data_X509_STORE_CTX_idx();
let ssl = ffi::X509_STORE_CTX_get_ex_data(x509_ctx, idx);
let verify = ffi::SSL_get_ex_data(ssl as *const _, get_ssl_callback_idx::<F>());
let verify: &F = &*(verify as *mut F);
let ctx = X509StoreContextRef::from_ptr(x509_ctx);
verify(preverify_ok != 0, ctx) as c_int
}
}
extern "C" fn raw_sni<F>(ssl: *mut ffi::SSL, al: *mut c_int, _arg: *mut c_void) -> c_int
where F: Fn(&mut SslRef) -> Result<(), SniError> + Any + 'static + Sync + Send
{
unsafe {
let ssl_ctx = ffi::SSL_get_SSL_CTX(ssl);
let callback = ffi::SSL_CTX_get_ex_data(ssl_ctx, get_callback_idx::<F>());
let callback: &F = &*(callback as *mut F);
let ssl = SslRef::from_ptr_mut(ssl);
match callback(ssl) {
Ok(()) => ffi::SSL_TLSEXT_ERR_OK,
Err(SniError::Fatal(e)) => {
*al = e;
ffi::SSL_TLSEXT_ERR_ALERT_FATAL
}
Err(SniError::Warning(e)) => {
*al = e;
ffi::SSL_TLSEXT_ERR_ALERT_WARNING
}
Err(SniError::NoAck) => ffi::SSL_TLSEXT_ERR_NOACK,
}
}
}
unsafe fn select_proto_using(ssl: *mut ffi::SSL,
out: *mut *mut c_uchar,
outlen: *mut c_uchar,
inbuf: *const c_uchar,
inlen: c_uint,
ex_data: c_int)
-> c_int {
// First, get the list of protocols (that the client should support) saved in the context
// extra data.
let ssl_ctx = ffi::SSL_get_SSL_CTX(ssl);
let protocols = ffi::SSL_CTX_get_ex_data(ssl_ctx, ex_data);
let protocols: &Vec<u8> = &*(protocols as *mut Vec<u8>);
// Prepare the client list parameters to be passed to the OpenSSL function...
let client = protocols.as_ptr();
let client_len = protocols.len() as c_uint;
// Finally, let OpenSSL find a protocol to be used, by matching the given server and
// client lists.
if ffi::SSL_select_next_proto(out, outlen, inbuf, inlen, client, client_len) !=
ffi::OPENSSL_NPN_NEGOTIATED {
ffi::SSL_TLSEXT_ERR_NOACK
} else {
ffi::SSL_TLSEXT_ERR_OK
}
}
/// The function is given as the callback to `SSL_CTX_set_next_proto_select_cb`.
///
/// It chooses the protocol that the client wishes to use, out of the given list of protocols
/// supported by the server. It achieves this by delegating to the `SSL_select_next_proto`
/// function. The list of protocols supported by the client is found in the extra data of the
/// OpenSSL context.
extern "C" fn raw_next_proto_select_cb(ssl: *mut ffi::SSL,
out: *mut *mut c_uchar,
outlen: *mut c_uchar,
inbuf: *const c_uchar,
inlen: c_uint,
_arg: *mut c_void)
-> c_int {
unsafe { select_proto_using(ssl, out, outlen, inbuf, inlen, *NPN_PROTOS_IDX) }
}
#[cfg(any(all(feature = "v102", ossl102), all(feature = "v110", ossl110)))]
extern "C" fn raw_alpn_select_cb(ssl: *mut ffi::SSL,
out: *mut *const c_uchar,
outlen: *mut c_uchar,
inbuf: *const c_uchar,
inlen: c_uint,
_arg: *mut c_void)
-> c_int {
unsafe { select_proto_using(ssl, out as *mut _, outlen, inbuf, inlen, *ALPN_PROTOS_IDX) }
}
unsafe extern "C" fn raw_tmp_dh<F>(ssl: *mut ffi::SSL,
is_export: c_int,
keylength: c_int)
-> *mut ffi::DH
where F: Fn(&mut SslRef, bool, u32) -> Result<Dh, ErrorStack> + Any + 'static + Sync + Send
{
let ctx = ffi::SSL_get_SSL_CTX(ssl);
let callback = ffi::SSL_CTX_get_ex_data(ctx, get_callback_idx::<F>());
let callback = &*(callback as *mut F);
let ssl = SslRef::from_ptr_mut(ssl);
match callback(ssl, is_export != 0, keylength as u32) {
Ok(dh) => {
let ptr = dh.as_ptr();
mem::forget(dh);
ptr
}
Err(_) => {
// FIXME reset error stack
ptr::null_mut()
}
}
}
#[cfg(any(all(feature = "v101", ossl101), all(feature = "v102", ossl102)))]
unsafe extern "C" fn raw_tmp_ecdh<F>(ssl: *mut ffi::SSL,
is_export: c_int,
keylength: c_int)
-> *mut ffi::EC_KEY
where F: Fn(&mut SslRef, bool, u32) -> Result<EcKey, ErrorStack> + Any + 'static + Sync + Send
{
let ctx = ffi::SSL_get_SSL_CTX(ssl);
let callback = ffi::SSL_CTX_get_ex_data(ctx, get_callback_idx::<F>());
let callback = &*(callback as *mut F);
let ssl = SslRef::from_ptr_mut(ssl);
match callback(ssl, is_export != 0, keylength as u32) {
Ok(ec_key) => {
let ptr = ec_key.as_ptr();
mem::forget(ec_key);
ptr
}
Err(_) => {
// FIXME reset error stack
ptr::null_mut()
}
}
}
unsafe extern "C" fn raw_tmp_dh_ssl<F>(ssl: *mut ffi::SSL,
is_export: c_int,
keylength: c_int)
-> *mut ffi::DH
where F: Fn(&mut SslRef, bool, u32) -> Result<Dh, ErrorStack> + Any + 'static + Sync + Send
{
let callback = ffi::SSL_get_ex_data(ssl, get_ssl_callback_idx::<F>());
let callback = &*(callback as *mut F);
let ssl = SslRef::from_ptr_mut(ssl);
match callback(ssl, is_export != 0, keylength as u32) {
Ok(dh) => {
let ptr = dh.as_ptr();
mem::forget(dh);
ptr
}
Err(_) => {
// FIXME reset error stack
ptr::null_mut()
}
}
}
#[cfg(any(all(feature = "v101", ossl101), all(feature = "v102", ossl102)))]
unsafe extern "C" fn raw_tmp_ecdh_ssl<F>(ssl: *mut ffi::SSL,
is_export: c_int,
keylength: c_int)
-> *mut ffi::EC_KEY
where F: Fn(&mut SslRef, bool, u32) -> Result<EcKey, ErrorStack> + Any + 'static + Sync + Send
{
let callback = ffi::SSL_get_ex_data(ssl, get_ssl_callback_idx::<F>());
let callback = &*(callback as *mut F);
let ssl = SslRef::from_ptr_mut(ssl);
match callback(ssl, is_export != 0, keylength as u32) {
Ok(ec_key) => {
let ptr = ec_key.as_ptr();
mem::forget(ec_key);
ptr
}
Err(_) => {
// FIXME reset error stack
ptr::null_mut()
}
}
}
unsafe extern "C" fn raw_tlsext_status<F>(ssl: *mut ffi::SSL, _: *mut c_void) -> c_int
where F: Fn(&mut SslRef) -> Result<bool, ErrorStack> + Any + 'static + Sync + Send
{
let ssl_ctx = ffi::SSL_get_SSL_CTX(ssl as *const _);
let callback = ffi::SSL_CTX_get_ex_data(ssl_ctx, get_callback_idx::<F>());
let callback = &*(callback as *mut F);
let ssl = SslRef::from_ptr_mut(ssl);
let ret = callback(ssl);
if ssl.is_server() {
match ret {
Ok(true) => ffi::SSL_TLSEXT_ERR_OK,
Ok(false) => ffi::SSL_TLSEXT_ERR_NOACK,
Err(_) => {
// FIXME reset error stack
ffi::SSL_TLSEXT_ERR_ALERT_FATAL
}
}
} else {
match ret {
Ok(true) => 1,
Ok(false) => 0,
Err(_) => {
// FIXME reset error stack
-1
}
}
}
}
/// The function is given as the callback to `SSL_CTX_set_next_protos_advertised_cb`.
///
/// It causes the parameter `out` to point at a `*const c_uchar` instance that
/// represents the list of protocols that the server should advertise as those
/// that it supports.
/// The list of supported protocols is found in the extra data of the OpenSSL
/// context.
extern "C" fn raw_next_protos_advertise_cb(ssl: *mut ffi::SSL,
out: *mut *const c_uchar,
outlen: *mut c_uint,
_arg: *mut c_void)
-> c_int {
unsafe {
// First, get the list of (supported) protocols saved in the context extra data.
let ssl_ctx = ffi::SSL_get_SSL_CTX(ssl);
let protocols = ffi::SSL_CTX_get_ex_data(ssl_ctx, *NPN_PROTOS_IDX);
if protocols.is_null() {
*out = b"".as_ptr();
*outlen = 0;
} else {
// If the pointer is valid, put the pointer to the actual byte array into the
// output parameter `out`, as well as its length into `outlen`.
let protocols: &Vec<u8> = &*(protocols as *mut Vec<u8>);
*out = protocols.as_ptr();
*outlen = protocols.len() as c_uint;
}
}
ffi::SSL_TLSEXT_ERR_OK
}
/// Convert a set of byte slices into a series of byte strings encoded for SSL. Encoding is a byte
/// containing the length followed by the string.
fn ssl_encode_byte_strings(strings: &[&[u8]]) -> Vec<u8> {