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px4-firmware/apps/examples/poll/net_reader.c

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/****************************************************************************
* examples/poll/net_reader.c
*
* Copyright (C) 2008-2009, 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 NuttX 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 <nuttx/config.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <stdint.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <pthread.h>
#include <fcntl.h>
#include <errno.h>
#include <debug.h>
#include <net/if.h>
#include <apps/netutils/uiplib.h>
#include "poll_internal.h"
/****************************************************************************
* Definitions
****************************************************************************/
#define IOBUFFER_SIZE 80
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: net_configure
****************************************************************************/
static void net_configure(void)
{
struct in_addr addr;
#if defined(CONFIG_EXAMPLE_POLL_NOMAC)
uint8_t mac[IFHWADDRLEN];
#endif
/* Configure uIP */
/* Many embedded network interfaces must have a software assigned MAC */
#ifdef CONFIG_EXAMPLE_POLL_NOMAC
mac[0] = 0x00;
mac[1] = 0xe0;
mac[2] = 0xde;
mac[3] = 0xad;
mac[4] = 0xbe;
mac[5] = 0xef;
uip_setmacaddr("eth0", mac);
#endif
/* Set up our host address */
addr.s_addr = HTONL(CONFIG_EXAMPLE_POLL_IPADDR);
uip_sethostaddr("eth0", &addr);
/* Set up the default router address */
addr.s_addr = HTONL(CONFIG_EXAMPLE_POLL_DRIPADDR);
uip_setdraddr("eth0", &addr);
/* Setup the subnet mask */
addr.s_addr = HTONL(CONFIG_EXAMPLE_POLL_NETMASK);
uip_setnetmask("eth0", &addr);
}
/****************************************************************************
* Name: net_receive
****************************************************************************/
static void net_receive(int sd)
{
struct timeval timeout;
char buffer[IOBUFFER_SIZE];
char *ptr;
fd_set readset;
int nbytes;
int ret;
/* Set up the timeout */
timeout.tv_sec = NET_LISTENER_DELAY;
timeout.tv_usec = 0;
/* Loop while we have the connection */
for (;;)
{
/* Wait for incoming message */
do
{
FD_ZERO(&readset);
FD_SET(sd, &readset);
ret = select(sd + 1, (FAR fd_set*)&readset, (FAR fd_set*)NULL, (FAR fd_set*)NULL, &timeout);
}
while (ret < 0 && errno == EINTR);
/* Something has happened */
if (ret < 0)
{
message("net_reader: select failed: %d\n", errno);
return;
}
else if (ret == 0)
{
message("net_reader: Timeout\n");
}
else
{
message("net_reader: Read data from sd=%d\n", sd);
memset(buffer, '?', IOBUFFER_SIZE); /* Just to make sure we really receive something */
ret = recv(sd, buffer, IOBUFFER_SIZE, 0);
if (ret < 0)
{
if (errno != EINTR)
{
message("net_reader: recv failed sd=%d: %d\n", sd, errno);
if (errno != EAGAIN)
{
return;
}
}
}
else if (ret == 0)
{
message("net_reader: Client connection lost sd=%d\n", sd);
return;
}
else
{
buffer[ret]='\0';
message("net_reader: Read '%s' (%d bytes)\n", buffer, ret);
/* Echo the data back to the client */
for (nbytes = ret, ptr = buffer; nbytes > 0; )
{
ret = send(sd, ptr, nbytes, 0);
if (ret < 0)
{
if (errno != EINTR)
{
message("net_reader: Send failed sd=%d: %d\n", sd, errno);
return;
}
}
else
{
nbytes -= ret;
ptr += ret;
}
}
}
}
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: net_reader
****************************************************************************/
void *net_reader(pthread_addr_t pvarg)
{
struct sockaddr_in addr;
#ifdef POLL_HAVE_SOLINGER
struct linger ling;
#endif
int listensd;
int acceptsd;
socklen_t addrlen;
int optval;
/* Configure uIP */
net_configure();
/* Create a new TCP socket */
listensd = socket(PF_INET, SOCK_STREAM, 0);
if (listensd < 0)
{
message("net_reader: socket failure: %d\n", errno);
goto errout;
}
/* Set socket to reuse address */
optval = 1;
if (setsockopt(listensd, SOL_SOCKET, SO_REUSEADDR, (void*)&optval, sizeof(int)) < 0)
{
message("net_reader: setsockopt SO_REUSEADDR failure: %d\n", errno);
goto errout_with_listensd;
}
/* Bind the socket to a local address */
addr.sin_family = AF_INET;
addr.sin_port = HTONS(LISTENER_PORT);
addr.sin_addr.s_addr = INADDR_ANY;
if (bind(listensd, (struct sockaddr*)&addr, sizeof(struct sockaddr_in)) < 0)
{
message("net_reader: bind failure: %d\n", errno);
goto errout_with_listensd;
}
/* Listen for connections on the bound TCP socket */
if (listen(listensd, 5) < 0)
{
message("net_reader: listen failure %d\n", errno);
goto errout_with_listensd;
}
/* Connection loop */
for (;;)
{
/* Accept only one connection */
message("net_reader: Accepting new connections on port %d\n", LISTENER_PORT);
addrlen = sizeof(struct sockaddr_in);
acceptsd = accept(listensd, (struct sockaddr*)&addr, &addrlen);
if (acceptsd < 0)
{
message("net_reader: accept failure: %d\n", errno);
continue;
}
message("net_reader: Connection accepted on sd=%d\n", acceptsd);
/* Configure to "linger" until all data is sent when the socket is closed */
#ifdef POLL_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("net_reader: setsockopt SO_LINGER failure: %d\n", errno);
goto errout_with_acceptsd;
}
#endif
/* Handle incoming messsages on the connection. */
net_receive(acceptsd);
message("net_reader: Closing sd=%d\n", acceptsd);
close(acceptsd);
}
#ifdef POLL_HAVE_SOLINGER
errout_with_acceptsd:
close(acceptsd);
#endif
errout_with_listensd:
close(listensd);
errout:
return NULL;
}
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