px4-firmware/apps/examples/nettest/nettest_server.c

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/****************************************************************************
* examples/nettest/nettest-server.c
*
* Copyright (C) 2007, 2011-2012 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 <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include "nettest.h"
/****************************************************************************
* Public Functions
****************************************************************************/
void recv_server(void)
{
struct sockaddr_in myaddr;
#ifdef NETTEST_HAVE_SOLINGER
struct linger ling;
#endif
char *buffer;
int listensd;
int acceptsd;
socklen_t addrlen;
int nbytesread;
#ifndef CONFIG_EXAMPLE_NETTEST_PERFORMANCE
int totalbytesread;
int nbytessent;
int ch;
int i;
#endif
int optval;
/* Allocate a BIG buffer */
buffer = (char*)malloc(2*SENDSIZE);
if (!buffer)
{
message("server: failed to allocate buffer\n");
exit(1);
}
/* Create a new TCP socket */
listensd = socket(PF_INET, SOCK_STREAM, 0);
if (listensd < 0)
{
message("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)
{
message("server: setsockopt SO_REUSEADDR failure: %d\n", errno);
goto errout_with_listensd;
}
/* Bind the socket to a local address */
myaddr.sin_family = AF_INET;
myaddr.sin_port = HTONS(PORTNO);
myaddr.sin_addr.s_addr = INADDR_ANY;
if (bind(listensd, (struct sockaddr*)&myaddr, sizeof(struct sockaddr_in)) < 0)
{
message("server: bind failure: %d\n", errno);
goto errout_with_listensd;
}
/* Listen for connections on the bound TCP socket */
if (listen(listensd, 5) < 0)
{
message("server: listen failure %d\n", errno);
goto errout_with_listensd;
}
/* Accept only one connection */
message("server: Accepting connections on port %d\n", PORTNO);
addrlen = sizeof(struct sockaddr_in);
acceptsd = accept(listensd, (struct sockaddr*)&myaddr, &addrlen);
if (acceptsd < 0)
{
message("server: accept failure: %d\n", errno);
goto errout_with_listensd;
}
message("server: Connection accepted -- receiving\n");
/* Configure to "linger" until all data is sent when the socket is closed */
#ifdef NETTEST_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)
{
message("server: setsockopt SO_LINGER failure: %d\n", errno);
goto errout_with_acceptsd;
}
#endif
#ifdef CONFIG_EXAMPLE_NETTEST_PERFORMANCE
/* Then receive data forever */
for (;;)
{
nbytesread = recv(acceptsd, buffer, 2*SENDSIZE, 0);
if (nbytesread < 0)
{
message("server: recv failed: %d\n", errno);
goto errout_with_acceptsd;
}
else if (nbytesread == 0)
{
message("server: The client broke the connection\n");
goto errout_with_acceptsd;
}
message("Received %d bytes\n", nbytesread);
}
#else
/* Receive canned message */
totalbytesread = 0;
while (totalbytesread < SENDSIZE)
{
message("server: Reading...\n");
nbytesread = recv(acceptsd, &buffer[totalbytesread], 2*SENDSIZE - totalbytesread, 0);
if (nbytesread < 0)
{
message("server: recv failed: %d\n", errno);
goto errout_with_acceptsd;
}
else if (nbytesread == 0)
{
message("server: The client broke the connection\n");
goto errout_with_acceptsd;
}
totalbytesread += nbytesread;
message("server: Received %d of %d bytes\n", totalbytesread, SENDSIZE);
}
/* Verify the message */
if (totalbytesread != SENDSIZE)
{
message("server: Received %d / Expected %d bytes\n", totalbytesread, SENDSIZE);
goto errout_with_acceptsd;
}
ch = 0x20;
for (i = 0; i < SENDSIZE; i++ )
{
if (buffer[i] != ch)
{
message("server: Byte %d is %02x / Expected %02x\n", i, buffer[i], ch);
goto errout_with_acceptsd;
}
if (++ch > 0x7e)
{
ch = 0x20;
}
}
/* Then send the same data back to the client */
message("server: Sending %d bytes\n", totalbytesread);
nbytessent = send(acceptsd, buffer, totalbytesread, 0);
if (nbytessent <= 0)
{
message("server: send failed: %d\n", errno);
goto errout_with_acceptsd;
}
message("server: Sent %d bytes\n", nbytessent);
/* If this platform only does abortive disconnects, then wait a bit to get the
* client side a change to receive the data.
*/
#if 1 /* Do it for all platforms */
message("server: Wait before closing\n");
sleep(60);
#endif
close(listensd);
close(acceptsd);
free(buffer);
return;
#endif
errout_with_acceptsd:
close(acceptsd);
errout_with_listensd:
close(listensd);
errout_with_buffer:
free(buffer);
exit(1);
}