# HG changeset patch
# User Vladimir Homutov <vl@nginx.com>
# Date 1607339160 -10800
# Node ID 43f3574b3e6f07a7f894f223598ef46c40b0d043
# Parent  f596a4e5794bb2ec916500a690af69a70514e298
QUIC: fixed handling of clients connected to wildcard address.

The patch replaces c->send() occurences with c->send_chain(), because the
latter accounts for the local address, which may be different if the wildcard
listener is used.

Previously, server sent response to client using address different from
one client connected to.

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
@@ -333,6 +333,7 @@ static ngx_int_t ngx_quic_output_frames(
 static void ngx_quic_free_frames(ngx_connection_t *c, ngx_queue_t *frames);
 static ngx_int_t ngx_quic_send_frames(ngx_connection_t *c,
     ngx_quic_send_ctx_t *ctx, ngx_queue_t *frames);
+static ssize_t ngx_quic_send(ngx_connection_t *c, u_char *buf, size_t len);
 
 static void ngx_quic_set_packet_number(ngx_quic_header_t *pkt,
     ngx_quic_send_ctx_t *ctx);
@@ -1171,7 +1172,7 @@ ngx_quic_send_stateless_reset(ngx_connec
         return NGX_ERROR;
     }
 
-    (void) c->send(c, buf, len);
+    (void) ngx_quic_send(c, buf, len);
 
     return NGX_DECLINED;
 }
@@ -1243,7 +1244,7 @@ ngx_quic_negotiate_version(ngx_connectio
                    "quic vnego packet to send len:%uz %*xs", len, len, buf);
 #endif
 
-    (void) c->send(c, buf, len);
+    (void) ngx_quic_send(c, buf, len);
 
     return NGX_ERROR;
 }
@@ -1298,8 +1299,8 @@ ngx_quic_send_retry(ngx_connection_t *c)
                    "quic packet to send len:%uz %xV", res.len, &res);
 #endif
 
-    len = c->send(c, res.data, res.len);
-    if (len == NGX_ERROR || (size_t) len != res.len) {
+    len = ngx_quic_send(c, res.data, res.len);
+    if (len == NGX_ERROR) {
         return NGX_ERROR;
     }
 
@@ -4906,8 +4907,8 @@ ngx_quic_send_frames(ngx_connection_t *c
         return NGX_ERROR;
     }
 
-    len = c->send(c, res.data, res.len);
-    if (len == NGX_ERROR || (size_t) len != res.len) {
+    len = ngx_quic_send(c, res.data, res.len);
+    if (len == NGX_ERROR) {
         ngx_quic_free_frames(c, frames);
         return NGX_ERROR;
     }
@@ -4946,6 +4947,31 @@ ngx_quic_send_frames(ngx_connection_t *c
 }
 
 
+static ssize_t
+ngx_quic_send(ngx_connection_t *c, u_char *buf, size_t len)
+{
+    ngx_buf_t    b;
+    ngx_chain_t  cl, *res;
+
+    ngx_memzero(&b, sizeof(ngx_buf_t));
+
+    b.pos = b.start = buf;
+    b.last = b.end = buf + len;
+    b.last_buf = 1;
+    b.temporary = 1;
+
+    cl.buf = &b;
+    cl.next= NULL;
+
+    res = c->send_chain(c, &cl, 0);
+    if (res == NGX_CHAIN_ERROR) {
+        return NGX_ERROR;
+    }
+
+    return len;
+}
+
+
 static void
 ngx_quic_set_packet_number(ngx_quic_header_t *pkt, ngx_quic_send_ctx_t *ctx)
 {