NPN/ALPN: allow disabling via command line

when using --http2 one can now selectively disable NPN or ALPN with
--no-alpn and --no-npn. for now honored with NSS only.

TODO: honor this option with GnuTLS and OpenSSL

1 files changed, 8 insertions, 0 deletions

diff --git a/lib/url.c b/lib/url.c
index 3e621bdee..3f2112d8a 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -563,6 +563,8 @@ CURLcode Curl_init_userdefined(struct UserDefined *set)
   set->tcp_keepintvl = 60;
   set->tcp_keepidle = 60;
 
+  set->ssl_enable_npn = TRUE;
+  set->ssl_enable_alpn = TRUE;
   return res;
 }
 
@@ -2478,6 +2480,12 @@ CURLcode Curl_setopt(struct SessionHandle *data, CURLoption option,
   case CURLOPT_TCP_KEEPINTVL:
     data->set.tcp_keepintvl = va_arg(param, long);
     break;
+  case CURLOPT_SSL_ENABLE_NPN:
+    data->set.ssl_enable_npn = (0 != va_arg(param, long))?TRUE:FALSE;
+    break;
+  case CURLOPT_SSL_ENABLE_ALPN:
+    data->set.ssl_enable_alpn = (0 != va_arg(param, long))?TRUE:FALSE;
+    break;
 
   default:
     /* unknown tag and its companion, just ignore: */