openssl: libressl 2.6.1 dropped suuport for npn

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>

openssl/build.rs

@@ -20,6 +20,10 @@ fn main() {
         println!("cargo:rustc-cfg=libressl");
     }
 
+    if let Ok(v) = env::var("DEP_OPENSSL_LIBRESSL_VERSION") {
+        println!("cargo:rustc-cfg=libressl{}", v);
+    }
+
     if let Ok(vars) = env::var("DEP_OPENSSL_CONF") {
         for var in vars.split(",") {
             println!("cargo:rustc-cfg=osslconf=\"{}\"", var);

openssl/src/ssl/mod.rs

@@ -652,6 +652,7 @@ impl SslContextBuilder {
 
     /// Set the protocols to be used during Next Protocol Negotiation (the protocols
     /// supported by the application).
+    #[cfg(not(libressl261))]
     pub fn set_npn_protocols(&mut self, protocols: &[&[u8]]) -> Result<(), ErrorStack> {
         // Firstly, convert the list of protocols to a byte-array that can be passed to OpenSSL
         // APIs -- a list of length-prefixed strings.
@@ -1310,6 +1311,7 @@ impl SslRef {
     ///
     /// The protocol's name is returned is an opaque sequence of bytes. It is up to the client
     /// to interpret it.
+    #[cfg(not(libressl261))]
     pub fn selected_npn_protocol(&self) -> Option<&[u8]> {
         unsafe {
             let mut data: *const c_uchar = ptr::null();

openssl/src/ssl/tests/mod.rs

@@ -503,6 +503,7 @@ fn test_connect_with_unilateral_alpn() {
 /// Tests that connecting with the client using NPN, but the server not does not
 /// break the existing connection behavior.
 #[test]
+#[cfg(not(libressl261))]
 fn test_connect_with_unilateral_npn() {
     let (_s, stream) = Server::new();
     let mut ctx = SslContext::builder(SslMethod::tls()).unwrap();
@@ -615,6 +616,7 @@ fn test_connect_with_npn_successful_single_match() {
 /// Tests that when the `SslStream` is created as a server stream, the protocols
 /// are correctly advertised to the client.
 #[test]
+#[cfg(not(libressl261))]
 fn test_npn_server_advertise_multiple() {
     let listener = TcpListener::bind("127.0.0.1:0").unwrap();
     let localhost = listener.local_addr().unwrap();