socket/tst-accept4.c

   1 /* Test the accept4 function with differing flags arguments.
   2    Copyright (C) 2017-2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <arpa/inet.h>
  20 #include <errno.h>
  21 #include <fcntl.h>
  22 #include <stdbool.h>
  23 #include <support/check.h>
  24 #include <support/xsocket.h>
  25 #include <support/xunistd.h>
  26 #include <sys/socket.h>
  27
  28 static bool
  29 is_nonblocking (int fd)
  30 {
  31   int status = fcntl (fd, F_GETFL);
  32   if (status < 0)
  33     FAIL_EXIT1 ("fcntl (F_GETFL): %m");
  34   return status & O_NONBLOCK;
  35 }
  36
  37 static bool
  38 is_cloexec (int fd)
  39 {
  40   int status = fcntl (fd, F_GETFD);
  41   if (status < 0)
  42     FAIL_EXIT1 ("fcntl (F_GETFD): %m");
  43   return status & FD_CLOEXEC;
  44 }
  45
  46 struct client
  47 {
  48   int socket;
  49   struct sockaddr_in address;
  50 };
  51
  52 /* Perform a non-blocking connect to *SERVER_ADDRESS.  */
  53 static struct client
  54 client_connect (const struct sockaddr_in *server_address)
  55 {
  56   struct client result;
  57   result.socket = xsocket (AF_INET,
  58                            SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0);
  59   TEST_VERIFY (is_nonblocking (result.socket));
  60   TEST_VERIFY (is_cloexec (result.socket));
  61   int ret = connect (result.socket, (const struct sockaddr *) server_address,
  62                      sizeof (*server_address));
  63   if (ret < 0 && errno != EINPROGRESS)
  64     FAIL_EXIT1 ("client connect: %m");
  65   socklen_t sa_len = sizeof (result.address);
  66   xgetsockname (result.socket, (struct sockaddr *) &result.address,
  67                 &sa_len);
  68   TEST_VERIFY (sa_len == sizeof (result.address));
  69   return result;
  70 }
  71
  72 static void
  73 check_same_address (const struct sockaddr_in *left,
  74                     const struct sockaddr_in *right)
  75 {
  76   TEST_VERIFY (left->sin_family == AF_INET);
  77   TEST_VERIFY (right->sin_family == AF_INET);
  78   TEST_VERIFY (left->sin_addr.s_addr == right->sin_addr.s_addr);
  79   TEST_VERIFY (left->sin_port == right->sin_port);
  80 }
  81
  82 static int
  83 do_test (void)
  84 {
  85   /* Create server socket.  */
  86   int server_socket = xsocket (AF_INET, SOCK_STREAM, 0);
  87   TEST_VERIFY (!is_nonblocking (server_socket));
  88   TEST_VERIFY (!is_cloexec (server_socket));
  89   struct sockaddr_in server_address =
  90     {
  91       .sin_family = AF_INET,
  92       .sin_addr = {.s_addr = htonl (INADDR_LOOPBACK) },
  93     };
  94   xbind (server_socket,
  95          (struct sockaddr *) &server_address, sizeof (server_address));
  96   {
  97     socklen_t sa_len = sizeof (server_address);
  98     xgetsockname (server_socket, (struct sockaddr *) &server_address,
  99                   &sa_len);
 100     TEST_VERIFY (sa_len == sizeof (server_address));
 101   }
 102   xlisten (server_socket, 5);
 103
 104   for (int do_nonblock = 0; do_nonblock < 2; ++do_nonblock)
 105     for (int do_cloexec = 0; do_cloexec < 2; ++do_cloexec)
 106       {
 107         int sockflags = 0;
 108         if (do_nonblock)
 109           sockflags |= SOCK_NONBLOCK;
 110         if (do_cloexec)
 111           sockflags |= SOCK_CLOEXEC;
 112
 113         struct client client = client_connect (&server_address);
 114         struct sockaddr_in client_address;
 115         socklen_t sa_len = sizeof (client_address);
 116         int client_socket = xaccept4 (server_socket,
 117                                       (struct sockaddr *) &client_address,
 118                                       &sa_len, sockflags);
 119         TEST_VERIFY (sa_len == sizeof (client_address));
 120         TEST_VERIFY (is_nonblocking (client_socket) == do_nonblock);
 121         TEST_VERIFY (is_cloexec (client_socket) == do_cloexec);
 122         check_same_address (&client.address, &client_address);
 123         xclose (client_socket);
 124         xclose (client.socket);
 125       }
 126
 127   xclose (server_socket);
 128   return 0;
 129 }
 130
 131 #include <support/test-driver.c>