# HG changeset patch
# User Sergey Kandaurov <pluknet@nginx.com>
# Date 1604957576 -10800
# Node ID e0947c952d43d46cff68d47ac2cf6fa2f934b2a7
# Parent  4416b7ab0a27d2bb4568595a88ca0fe6dc8f2289
QUIC: multiple versions support in ALPN.

Previously, a version based on NGX_QUIC_DRAFT_VERSION was always set.
Now it is taken from the negotiated QUIC version that may differ.

diff --git a/src/event/ngx_event_quic.c b/src/event/ngx_event_quic.c
--- a/src/event/ngx_event_quic.c
+++ b/src/event/ngx_event_quic.c
@@ -5813,3 +5813,14 @@ ngx_quic_free_frame(ngx_connection_t *c,
                    "quic free frame n:%ui", qc->nframes);
 #endif
 }
+
+
+uint32_t
+ngx_quic_version(ngx_connection_t *c)
+{
+    uint32_t  version;
+
+    version = c->quic->version;
+
+    return (version & 0xff000000) == 0xff000000 ? version & 0xff : version;
+}
diff --git a/src/event/ngx_event_quic.h b/src/event/ngx_event_quic.h
--- a/src/event/ngx_event_quic.h
+++ b/src/event/ngx_event_quic.h
@@ -122,6 +122,7 @@ void ngx_quic_run(ngx_connection_t *c, n
 ngx_connection_t *ngx_quic_open_stream(ngx_connection_t *c, ngx_uint_t bidi);
 void ngx_quic_finalize_connection(ngx_connection_t *c, ngx_uint_t err,
     const char *reason);
+uint32_t ngx_quic_version(ngx_connection_t *c);
 
 
 /********************************* DEBUG *************************************/
diff --git a/src/http/modules/ngx_http_quic_module.h b/src/http/modules/ngx_http_quic_module.h
--- a/src/http/modules/ngx_http_quic_module.h
+++ b/src/http/modules/ngx_http_quic_module.h
@@ -14,9 +14,8 @@
 #include <ngx_http.h>
 
 
-#define NGX_HTTP_QUIC_ALPN(s)         NGX_HTTP_QUIC_ALPN_DRAFT(s)
-#define NGX_HTTP_QUIC_ALPN_DRAFT(s)   "\x05hq-" #s
-#define NGX_HTTP_QUIC_ALPN_ADVERTISE  NGX_HTTP_QUIC_ALPN(NGX_QUIC_DRAFT_VERSION)
+#define NGX_HTTP_QUIC_ALPN_ADVERTISE  "\x02hq"
+#define NGX_HTTP_QUIC_ALPN_DRAFT_FMT  "\x05hq-%02uD"
 
 
 extern ngx_module_t  ngx_http_quic_module;
diff --git a/src/http/modules/ngx_http_ssl_module.c b/src/http/modules/ngx_http_ssl_module.c
--- a/src/http/modules/ngx_http_ssl_module.c
+++ b/src/http/modules/ngx_http_ssl_module.c
@@ -418,6 +418,9 @@ ngx_http_ssl_alpn_select(ngx_ssl_conn_t 
     unsigned char *outlen, const unsigned char *in, unsigned int inlen,
     void *arg)
 {
+#if (NGX_HTTP_QUIC)
+    const char             *fmt;
+#endif
     unsigned int            srvlen;
     unsigned char          *srv;
 #if (NGX_DEBUG)
@@ -452,16 +455,32 @@ ngx_http_ssl_alpn_select(ngx_ssl_conn_t 
 
     } else
 #endif
-#if (NGX_HTTP_V3)
-    if (hc->addr_conf->http3) {
-        srv = (unsigned char *) NGX_HTTP_V3_ALPN_ADVERTISE;
-        srvlen = sizeof(NGX_HTTP_V3_ALPN_ADVERTISE) - 1;
-    } else
-#endif
 #if (NGX_HTTP_QUIC)
     if (hc->addr_conf->quic) {
-        srv = (unsigned char *) NGX_HTTP_QUIC_ALPN_ADVERTISE;
-        srvlen = sizeof(NGX_HTTP_QUIC_ALPN_ADVERTISE) - 1;
+#if (NGX_HTTP_V3)
+        if (hc->addr_conf->http3) {
+            srv = (unsigned char *) NGX_HTTP_V3_ALPN_ADVERTISE;
+            srvlen = sizeof(NGX_HTTP_V3_ALPN_ADVERTISE) - 1;
+            fmt = NGX_HTTP_V3_ALPN_DRAFT_FMT;
+
+        } else
+#endif
+        {
+            srv = (unsigned char *) NGX_HTTP_QUIC_ALPN_ADVERTISE;
+            srvlen = sizeof(NGX_HTTP_QUIC_ALPN_ADVERTISE) - 1;
+            fmt = NGX_HTTP_QUIC_ALPN_DRAFT_FMT;
+        }
+
+        /* QUIC draft */
+
+        if (ngx_quic_version(c) > 1) {
+            srv = ngx_pnalloc(c->pool, sizeof("\x05h3-xx") - 1);
+            if (srv == NULL) {
+                return SSL_TLSEXT_ERR_NOACK;
+            }
+            srvlen = ngx_sprintf(srv, fmt, ngx_quic_version(c)) - srv;
+        }
+
     } else
 #endif
     {
diff --git a/src/http/v3/ngx_http_v3.h b/src/http/v3/ngx_http_v3.h
--- a/src/http/v3/ngx_http_v3.h
+++ b/src/http/v3/ngx_http_v3.h
@@ -15,9 +15,8 @@
 #include <ngx_http_v3_parse.h>
 
 
-#define NGX_HTTP_V3_ALPN(s)         NGX_HTTP_V3_ALPN_DRAFT(s)
-#define NGX_HTTP_V3_ALPN_DRAFT(s)   "\x05h3-" #s
-#define NGX_HTTP_V3_ALPN_ADVERTISE  NGX_HTTP_V3_ALPN(NGX_QUIC_DRAFT_VERSION)
+#define NGX_HTTP_V3_ALPN_ADVERTISE                 "\x02h3"
+#define NGX_HTTP_V3_ALPN_DRAFT_FMT                 "\x05h3-%02uD"
 
 #define NGX_HTTP_V3_VARLEN_INT_LEN                 4
 #define NGX_HTTP_V3_PREFIX_INT_LEN                 11