[Added] danger feature

Cargo.toml

@@ -10,6 +10,9 @@ readme = "README.md"
 description = "Asynchronous TLS/SSL streams for Tokio using Rustls."
 categories = ["asynchronous", "cryptography", "network-programming"]
 
+[features]
+danger = [ "rustls/dangerous_configuration" ]
+
 [dependencies]
 futures = "0.1"
 tokio-io = "0.1"

src/lib.rs

@@ -22,6 +22,11 @@ pub trait ClientConfigExt {
     fn connect_async<S>(&self, domain: &str, stream: S)
         -> ConnectAsync<S>
         where S: AsyncRead + AsyncWrite;
+
+    #[cfg(feature = "danger")]
+    fn danger_connect_async_without_providing_domain_for_certificate_verification_and_server_name_indication<S>(&self, stream: S)
+        -> ConnectAsync<S>
+        where S: AsyncRead + AsyncWrite;
 }
 
 /// Extension trait for the `Arc<ServerConfig>` type in the `rustls` crate.
@@ -48,6 +53,30 @@ impl ClientConfigExt for Arc<ClientConfig> {
     {
         connect_async_with_session(stream, ClientSession::new(self, domain))
     }
+
+    #[cfg(feature = "danger")]
+    fn danger_connect_async_without_providing_domain_for_certificate_verification_and_server_name_indication<S>(&self, stream: S)
+        -> ConnectAsync<S>
+        where S: AsyncRead + AsyncWrite
+    {
+        use rustls::{ ServerCertVerifier, RootCertStore, Certificate, TLSError };
+
+        struct NoCertVerifier;
+        impl ServerCertVerifier for NoCertVerifier {
+            fn verify_server_cert(&self, _: &RootCertStore, _: &[Certificate], _: &str)
+                -> Result<(), TLSError>
+            {
+                Ok(())
+            }
+        }
+
+        let mut client_config = ClientConfig::new();
+        client_config.clone_from(self);
+        client_config.dangerous()
+            .set_certificate_verifier(Box::new(NoCertVerifier));
+
+        Arc::new(client_config).connect_async("", stream)
+    }
 }
 
 #[inline]