unix,tcp: avoid marking server sockets connected

It shouldn't be setting READABLE and WRITABLE on the socket server,
since they aren't, and this could confuse the client.

PR-URL: https://github.com/libuv/libuv/pull/1655
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>

src/unix/stream.c

@@ -1411,6 +1411,9 @@ int uv_write2(uv_write_t* req,
   if (uv__stream_fd(stream) < 0)
     return -EBADF;
 
+  if (!(stream->flags & UV_STREAM_WRITABLE))
+    return -EPIPE;
+
   if (send_handle) {
     if (stream->type != UV_NAMED_PIPE || !((uv_pipe_t*)stream)->ipc)
       return -EINVAL;
@@ -1562,6 +1565,9 @@ int uv_read_start(uv_stream_t* stream,
   if (stream->flags & UV_CLOSING)
     return -EINVAL;
 
+  if (!(stream->flags & UV_STREAM_READABLE))
+    return -ENOTCONN;
+
   /* The UV_STREAM_READING flag is irrelevant of the state of the tcp - it just
    * expresses the desired state of the user.
    */

src/unix/tcp.c

@@ -158,9 +158,7 @@ int uv__tcp_bind(uv_tcp_t* tcp,
   if ((flags & UV_TCP_IPV6ONLY) && addr->sa_family != AF_INET6)
     return -EINVAL;
 
-  err = maybe_new_socket(tcp,
-                         addr->sa_family,
-                         UV_STREAM_READABLE | UV_STREAM_WRITABLE);
+  err = maybe_new_socket(tcp, addr->sa_family, 0);
   if (err)
     return err;
 
@@ -335,14 +333,14 @@ int uv_tcp_listen(uv_tcp_t* tcp, int backlog, uv_connection_cb cb) {
   if (single_accept)
     tcp->flags |= UV_TCP_SINGLE_ACCEPT;
 
-  flags = UV_STREAM_READABLE;
+  flags = 0;
 #if defined(__MVS__)
   /* on zOS the listen call does not bind automatically
      if the socket is unbound. Hence the manual binding to
      an arbitrary port is required to be done manually
   */
   flags |= UV_HANDLE_BOUND;
-#endif  
+#endif
   err = maybe_new_socket(tcp, AF_INET, flags);
   if (err)
     return err;

test/test-list.h

@@ -93,6 +93,7 @@ TEST_DECLARE   (tcp_bind_error_fault)
 TEST_DECLARE   (tcp_bind_error_inval)
 TEST_DECLARE   (tcp_bind_localhost_ok)
 TEST_DECLARE   (tcp_bind_invalid_flags)
+TEST_DECLARE   (tcp_bind_writable_flags)
 TEST_DECLARE   (tcp_listen_without_bind)
 TEST_DECLARE   (tcp_connect_error_fault)
 TEST_DECLARE   (tcp_connect_timeout)
@@ -530,6 +531,7 @@ TASK_LIST_START
   TEST_ENTRY  (tcp_bind_error_inval)
   TEST_ENTRY  (tcp_bind_localhost_ok)
   TEST_ENTRY  (tcp_bind_invalid_flags)
+  TEST_ENTRY  (tcp_bind_writable_flags)
   TEST_ENTRY  (tcp_listen_without_bind)
   TEST_ENTRY  (tcp_connect_error_fault)
   TEST_ENTRY  (tcp_connect_timeout)

test/test-tcp-bind-error.c

@@ -214,3 +214,45 @@ TEST_IMPL(tcp_listen_without_bind) {
   MAKE_VALGRIND_HAPPY();
   return 0;
 }
+
+
+TEST_IMPL(tcp_bind_writable_flags) {
+  struct sockaddr_in addr;
+  uv_tcp_t server;
+  uv_buf_t buf;
+  uv_write_t write_req;
+  uv_shutdown_t shutdown_req;
+  int r;
+
+  ASSERT(0 == uv_ip4_addr("0.0.0.0", TEST_PORT, &addr));
+  r = uv_tcp_init(uv_default_loop(), &server);
+  ASSERT(r == 0);
+  r = uv_tcp_bind(&server, (const struct sockaddr*) &addr, 0);
+  ASSERT(r == 0);
+  r = uv_listen((uv_stream_t*)&server, 128, NULL);
+  ASSERT(r == 0);
+
+  ASSERT(0 == uv_is_writable((uv_stream_t*) &server));
+  ASSERT(0 == uv_is_readable((uv_stream_t*) &server));
+
+  buf = uv_buf_init("PING", 4);
+  r = uv_write(&write_req, (uv_stream_t*) &server, &buf, 1, NULL);
+  ASSERT(r == UV_EPIPE);
+  r = uv_shutdown(&shutdown_req, (uv_stream_t*) &server, NULL);
+#ifdef _WIN32
+  ASSERT(r == UV_EPIPE);
+#else
+  ASSERT(r == UV_ENOTCONN);
+#endif
+  r = uv_read_start((uv_stream_t*) &server, NULL, NULL);
+  ASSERT(r == UV_ENOTCONN);
+
+  uv_close((uv_handle_t*)&server, close_cb);
+
+  uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+
+  ASSERT(close_cb_called == 1);
+
+  MAKE_VALGRIND_HAPPY();
+  return 0;
+}