tests/socket-client.h

   1 /* Create sockets for use in tests (client side).
   2    Copyright (C) 2011-2025 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2011.  */
  18
  19 #include <stdio.h>
  20 #include <sys/socket.h>
  21 #include <netinet/in.h>
  22 #include <arpa/inet.h>
  23
  24 /* Creates a client socket, by connecting to a server on the given port.  */
  25 static int
  26 create_client_socket (int port)
  27 {
  28   int client_socket;
  29
  30   /* Create a client socket.  */
  31   client_socket = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
  32   ASSERT (client_socket >= 0);
  33   /* Connect to the server process at the specified port.  */
  34   {
  35     struct sockaddr_in addr;
  36
  37     memset (&addr, 0, sizeof (addr)); /* needed on AIX and OSF/1 */
  38     addr.sin_family = AF_INET;
  39     #if 0 /* Unoptimized */
  40     inet_pton (AF_INET, "127.0.0.1", &addr.sin_addr);
  41     #elif 0 /* Nearly optimized */
  42     addr.sin_addr.s_addr = htonl (0x7F000001); /* 127.0.0.1 */
  43     #else /* Fully optimized */
  44     {
  45       unsigned char dotted[4] = { 127, 0, 0, 1 }; /* 127.0.0.1 */
  46       memcpy (&addr.sin_addr.s_addr, dotted, 4);
  47     }
  48     #endif
  49     addr.sin_port = htons (port);
  50
  51     ASSERT (connect (client_socket,
  52                      (const struct sockaddr *) &addr, sizeof (addr))
  53             == 0);
  54   }
  55
  56   return client_socket;
  57 }