1 files changed, 39 insertions, 1 deletions
diff --git a/Utilities/cmcurl/lib/vtls/vtls_int.h b/Utilities/cmcurl/lib/vtls/vtls_int.h
index a20ca7d..ed49339 100644
--- a/Utilities/cmcurl/lib/vtls/vtls_int.h
+++ b/Utilities/cmcurl/lib/vtls/vtls_int.h
@@ -29,17 +29,55 @@
 
 #ifdef USE_SSL
 
+/* see https://www.iana.org/assignments/tls-extensiontype-values/ */
+#define ALPN_HTTP_1_1_LENGTH 8
+#define ALPN_HTTP_1_1 "http/1.1"
+#define ALPN_HTTP_1_0_LENGTH 8
+#define ALPN_HTTP_1_0 "http/1.0"
+#define ALPN_H2_LENGTH 2
+#define ALPN_H2 "h2"
+#define ALPN_H3_LENGTH 2
+#define ALPN_H3 "h3"
+
+/* conservative sizes on the ALPN entries and count we are handling,
+ * we can increase these if we ever feel the need or have to accommodate
+ * ALPN strings from the "outside". */
+#define ALPN_NAME_MAX     10
+#define ALPN_ENTRIES_MAX  3
+#define ALPN_PROTO_BUF_MAX   (ALPN_ENTRIES_MAX * (ALPN_NAME_MAX + 1))
+
+struct alpn_spec {
+  const char entries[ALPN_ENTRIES_MAX][ALPN_NAME_MAX];
+  size_t count; /* number of entries */
+};
+
+struct alpn_proto_buf {
+  unsigned char data[ALPN_PROTO_BUF_MAX];
+  int len;
+};
+
+CURLcode Curl_alpn_to_proto_buf(struct alpn_proto_buf *buf,
+                                const struct alpn_spec *spec);
+CURLcode Curl_alpn_to_proto_str(struct alpn_proto_buf *buf,
+                                const struct alpn_spec *spec);
+
+CURLcode Curl_alpn_set_negotiated(struct Curl_cfilter *cf,
+                                  struct Curl_easy *data,
+                                  const unsigned char *proto,
+                                  size_t proto_len);
+
 /* Information in each SSL cfilter context: cf->ctx */
 struct ssl_connect_data {
   ssl_connection_state state;
   ssl_connect_state connecting_state;
   char *hostname;                   /* hostname for verification */
   char *dispname;                   /* display version of hostname */
-  int port;                         /* remote port at origin */
   const struct alpn_spec *alpn;     /* ALPN to use or NULL for none */
   struct ssl_backend_data *backend; /* vtls backend specific props */
   struct cf_call_data call_data;    /* data handle used in current call */
   struct curltime handshake_done;   /* time when handshake finished */
+  int port;                         /* remote port at origin */
+  BIT(use_alpn);                    /* if ALPN shall be used in handshake */
 };