QUIC: fixed broken token in NEW_TOKEN (ticket #2446).

Previously, since 3550b00d9dc8, the token was allocated on stack, to get
rid of pool usage.  Now the token is allocated by ngx_quic_copy_buffer()
in QUIC buffers, also used for STREAM, CRYPTO and ACK frames.

src/event/quic/ngx_event_quic_frames.c

@@ -858,6 +858,20 @@ ngx_quic_log_frame(ngx_log_t *log, ngx_quic_frame_t *f, ngx_uint_t tx)
 
     case NGX_QUIC_FT_NEW_TOKEN:
         p = ngx_slprintf(p, last, "NEW_TOKEN");
+
+#ifdef NGX_QUIC_DEBUG_FRAMES
+        {
+            ngx_chain_t  *cl;
+
+            p = ngx_slprintf(p, last, " token:");
+
+            for (cl = f->data; cl; cl = cl->next) {
+                p = ngx_slprintf(p, last, "%*xs",
+                                 cl->buf->last - cl->buf->pos, cl->buf->pos);
+            }
+        }
+#endif
+
         break;
 
     case NGX_QUIC_FT_HANDSHAKE_DONE:

src/event/quic/ngx_event_quic_output.c

@@ -1076,6 +1076,7 @@ ngx_quic_send_new_token(ngx_connection_t *c, ngx_quic_path_t *path)
 {
     time_t                  expires;
     ngx_str_t               token;
+    ngx_chain_t            *out;
     ngx_quic_frame_t       *frame;
     ngx_quic_connection_t  *qc;
 
@@ -1095,6 +1096,11 @@ ngx_quic_send_new_token(ngx_connection_t *c, ngx_quic_path_t *path)
         return NGX_ERROR;
     }
 
+    out = ngx_quic_copy_buffer(c, token.data, token.len);
+    if (out == NGX_CHAIN_ERROR) {
+        return NGX_ERROR;
+    }
+
     frame = ngx_quic_alloc_frame(c);
     if (frame == NULL) {
         return NGX_ERROR;
@@ -1102,8 +1108,8 @@ ngx_quic_send_new_token(ngx_connection_t *c, ngx_quic_path_t *path)
 
     frame->level = ssl_encryption_application;
     frame->type = NGX_QUIC_FT_NEW_TOKEN;
+    frame->data = out;
     frame->u.token.length = token.len;
-    frame->u.token.data = token.data;
 
     ngx_quic_queue_frame(qc, frame);
 

src/event/quic/ngx_event_quic_transport.c

@@ -109,7 +109,7 @@ static size_t ngx_quic_create_crypto(u_char *p,
     ngx_quic_crypto_frame_t *crypto, ngx_chain_t *data);
 static size_t ngx_quic_create_hs_done(u_char *p);
 static size_t ngx_quic_create_new_token(u_char *p,
-    ngx_quic_new_token_frame_t *token);
+    ngx_quic_new_token_frame_t *token, ngx_chain_t *data);
 static size_t ngx_quic_create_stream(u_char *p, ngx_quic_stream_frame_t *sf,
     ngx_chain_t *data);
 static size_t ngx_quic_create_max_streams(u_char *p,
@@ -1301,7 +1301,7 @@ ngx_quic_create_frame(u_char *p, ngx_quic_frame_t *f)
         return ngx_quic_create_hs_done(p);
 
     case NGX_QUIC_FT_NEW_TOKEN:
-        return ngx_quic_create_new_token(p, &f->u.token);
+        return ngx_quic_create_new_token(p, &f->u.token, f->data);
 
     case NGX_QUIC_FT_STREAM:
         return ngx_quic_create_stream(p, &f->u.stream, f->data);
@@ -1491,10 +1491,12 @@ ngx_quic_create_hs_done(u_char *p)
 
 
 static size_t
-ngx_quic_create_new_token(u_char *p, ngx_quic_new_token_frame_t *token)
+ngx_quic_create_new_token(u_char *p, ngx_quic_new_token_frame_t *token,
+    ngx_chain_t *data)
 {
-    size_t   len;
-    u_char  *start;
+    size_t      len;
+    u_char     *start;
+    ngx_buf_t  *b;
 
     if (p == NULL) {
         len = ngx_quic_varint_len(NGX_QUIC_FT_NEW_TOKEN);
@@ -1508,7 +1510,12 @@ ngx_quic_create_new_token(u_char *p, ngx_quic_new_token_frame_t *token)
 
     ngx_quic_build_int(&p, NGX_QUIC_FT_NEW_TOKEN);
     ngx_quic_build_int(&p, token->length);
-    p = ngx_cpymem(p, token->data, token->length);
+
+    while (data) {
+        b = data->buf;
+        p = ngx_cpymem(p, b->pos, b->last - b->pos);
+        data = data->next;
+    }
 
     return p - start;
 }

src/event/quic/ngx_event_quic_transport.h

@@ -167,7 +167,6 @@ typedef struct {
 
 typedef struct {
     uint64_t                                    length;
-    u_char                                     *data;
 } ngx_quic_new_token_frame_t;
 
 /*