nuttx-apps/examples/tcpblaster/tcpblaster_server.c

/****************************************************************************
 * examples/tcpblaster/tcpblaster-server.c
 *
 *   Copyright (C) 2018 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name Gregory Nutt nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include "config.h"

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>

#include <arpa/inet.h>

#include "tcpblaster.h"

/****************************************************************************
 * Public Functions
 ****************************************************************************/

void tcpblaster_server(void)
{
#ifdef CONFIG_EXAMPLES_TCPBLASTER_IPv6
  struct sockaddr_in6 myaddr;
#else
  struct sockaddr_in myaddr;
#endif
#ifdef TCPBLASTER_HAVE_SOLINGER
  struct linger ling;
#endif
  struct timespec start;
  unsigned long recvtotal;
  socklen_t addrlen;
  char *buffer;
  int recvcount;
  int listensd;
  int acceptsd;
  int nbytesread;
  int optval;

  /* Allocate a BIG buffer */

  buffer = (char*)malloc(SENDSIZE);
  if (!buffer)
    {
      printf("server: failed to allocate buffer\n");
      exit(1);
    }

  /* Create a new TCP socket */

  listensd = socket(PF_INETX, SOCK_STREAM, 0);
  if (listensd < 0)
    {
      printf("server: socket failure: %d\n", errno);
      goto errout_with_buffer;
    }

  /* Set socket to reuse address */

  optval = 1;
  if (setsockopt(listensd, SOL_SOCKET, SO_REUSEADDR, (void*)&optval, sizeof(int)) < 0)
    {
      printf("server: setsockopt SO_REUSEADDR failure: %d\n", errno);
      goto errout_with_listensd;
    }

  /* Bind the socket to a local address */

#ifdef CONFIG_EXAMPLES_TCPBLASTER_IPv6

  myaddr.sin6_family            = AF_INET6;
  myaddr.sin6_port              = HTONS(CONFIG_EXAMPLES_TCPBLASTER_SERVER_PORTNO);
#if defined(CONFIG_EXAMPLES_TCPBLASTER_LOOPBACK) && !defined(NET_LOOPBACK)
  memcpy(myaddr.sin6_addr.s6_addr16, g_tcpblasterserver_ipv6, 8 * sizeof(uint16_t));
#else
  memset(myaddr.sin6_addr.s6_addr16, 0, 8 * sizeof(uint16_t));
#endif
  addrlen = sizeof(struct sockaddr_in6);

  printf("Binding to IPv6 Address: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
         myaddr.sin6_addr.s6_addr16[0], myaddr.sin6_addr.s6_addr16[1],
         myaddr.sin6_addr.s6_addr16[2], myaddr.sin6_addr.s6_addr16[3],
         myaddr.sin6_addr.s6_addr16[4], myaddr.sin6_addr.s6_addr16[5],
         myaddr.sin6_addr.s6_addr16[6], myaddr.sin6_addr.s6_addr16[7]);
#else
  myaddr.sin_family             = AF_INET;
  myaddr.sin_port               = HTONS(CONFIG_EXAMPLES_TCPBLASTER_SERVER_PORTNO);

#if defined(CONFIG_EXAMPLES_TCPBLASTER_LOOPBACK) && !defined(NET_LOOPBACK)
  myaddr.sin_addr.s_addr        = (in_addr_t)g_tcpblasterserver_ipv4;
#else
  myaddr.sin_addr.s_addr        = INADDR_ANY;
#endif
  addrlen = sizeof(struct sockaddr_in);

  printf("Binding to IPv4 Address: %08lx\n",
         (unsigned long)myaddr.sin_addr.s_addr);
#endif

  if (bind(listensd, (struct sockaddr*)&myaddr, addrlen) < 0)
    {
      printf("server: bind failure: %d\n", errno);
      goto errout_with_listensd;
    }

  /* Listen for connections on the bound TCP socket */

  if (listen(listensd, 5) < 0)
    {
      printf("server: listen failure %d\n", errno);
      goto errout_with_listensd;
    }

  /* Accept only one connection */

  printf("server: Accepting connections on port %d\n",
         CONFIG_EXAMPLES_TCPBLASTER_SERVER_PORTNO);
  acceptsd = accept(listensd, (struct sockaddr*)&myaddr, &addrlen);
  if (acceptsd < 0)
    {
      printf("server: accept failure: %d\n", errno);
      goto errout_with_listensd;
    }

  printf("server: Connection accepted -- receiving\n");

  /* Configure to "linger" until all data is sent when the socket is closed */

#ifdef TCPBLASTER_HAVE_SOLINGER
  ling.l_onoff  = 1;
  ling.l_linger = 30;     /* timeout is seconds */

  if (setsockopt(acceptsd, SOL_SOCKET, SO_LINGER, &ling, sizeof(struct linger)) < 0)
    {
      printf("server: setsockopt SO_LINGER failure: %d\n", errno);
      goto errout_with_acceptsd;
    }
#endif

  /* Then receive data forever */

  recvcount = 0;
  recvtotal = 0;

  for (; ; )
    {
      nbytesread = recv(acceptsd, buffer, SENDSIZE, 0);
      if (nbytesread < 0)
        {
          printf("server: recv failed: %d\n", errno);
          goto errout_with_acceptsd;
        }
      else if (nbytesread == 0)
        {
          printf("server: The client broke the connection\n");
          goto errout_with_acceptsd;
        }

      recvtotal += nbytesread;

      if (++recvcount >= 50)
        {
          struct timespec elapsed;
          struct timespec curr;
          float fkbsent;
          float felapsed;

          (void)clock_gettime(CLOCK_REALTIME, &curr);

          elapsed.tv_sec  = curr.tv_sec - start.tv_sec;
          if (curr.tv_nsec >= start.tv_nsec)
            {
              elapsed.tv_nsec = curr.tv_nsec - start.tv_nsec;
            }
          else
            {
              unsigned long borrow = 1000000000 - start.tv_nsec;
              elapsed.tv_nsec = curr.tv_nsec + borrow;
            }

          fkbsent  = (float)recvtotal / 1024.0;
          felapsed = (float)elapsed.tv_sec + (float)elapsed.tv_nsec / 1000000000.0;
          printf("Received %d packets:  %7.1f Kb (avg %5.1f Kb) in %6.2f Sec (%7.1f Kbps)\n",
                  recvcount, fkbsent, fkbsent/recvcount, felapsed, fkbsent/felapsed);

          recvcount       = 0;
          recvtotal       = 0;

          (void)clock_gettime(CLOCK_REALTIME, &start);
       }
    }

errout_with_acceptsd:
  close(acceptsd);

errout_with_listensd:
  close(listensd);

errout_with_buffer:
  free(buffer);
  exit(1);
}