330 lines
9.4 KiB
C
330 lines
9.4 KiB
C
/****************************************************************************
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* examples/poll/net_reader.c
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*
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* Copyright (C) 2008-2009, 2011-2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/select.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <pthread.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <debug.h>
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#include <net/if.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include "netutils/netlib.h"
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#include "poll_internal.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define IOBUFFER_SIZE 80
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: net_configure
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****************************************************************************/
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static void net_configure(void)
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{
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struct in_addr addr;
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#if defined(CONFIG_EXAMPLES_POLL_NOMAC)
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uint8_t mac[IFHWADDRLEN];
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#endif
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/* Configure the network */
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/* Many embedded network interfaces must have a software assigned MAC */
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#ifdef CONFIG_EXAMPLES_POLL_NOMAC
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mac[0] = 0x00;
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mac[1] = 0xe0;
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mac[2] = 0xde;
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mac[3] = 0xad;
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mac[4] = 0xbe;
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mac[5] = 0xef;
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netlib_setmacaddr("eth0", mac);
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#endif
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/* Set up our host address */
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addr.s_addr = HTONL(CONFIG_EXAMPLES_POLL_IPADDR);
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netlib_set_ipv4addr("eth0", &addr);
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/* Set up the default router address */
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addr.s_addr = HTONL(CONFIG_EXAMPLES_POLL_DRIPADDR);
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netlib_set_dripv4addr("eth0", &addr);
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/* Setup the subnet mask */
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addr.s_addr = HTONL(CONFIG_EXAMPLES_POLL_NETMASK);
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netlib_set_ipv4netmask("eth0", &addr);
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/* New versions of netlib_set_ipvXaddr will not bring the network up,
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* So ensure the network is really up at this point.
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*/
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netlib_ifup("eth0");
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}
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/****************************************************************************
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* Name: net_receive
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****************************************************************************/
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static void net_receive(int sd)
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{
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struct timeval timeout;
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char buffer[IOBUFFER_SIZE];
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char *ptr;
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fd_set readset;
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int nbytes;
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int ret;
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/* Set up the timeout */
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timeout.tv_sec = NET_LISTENER_DELAY;
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timeout.tv_usec = 0;
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/* Loop while we have the connection */
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for (;;)
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{
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/* Wait for incoming message */
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do
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{
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FD_ZERO(&readset);
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FD_SET(sd, &readset);
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ret = select(sd + 1, (FAR fd_set*)&readset, (FAR fd_set*)NULL, (FAR fd_set*)NULL, &timeout);
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}
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while (ret < 0 && errno == EINTR);
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/* Something has happened */
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if (ret < 0)
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{
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printf("net_reader: select failed: %d\n", errno);
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return;
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}
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else if (ret == 0)
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{
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printf("net_reader: Timeout\n");
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}
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else
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{
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printf("net_reader: Read data from sd=%d\n", sd);
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memset(buffer, '?', IOBUFFER_SIZE); /* Just to make sure we really receive something */
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ret = recv(sd, buffer, IOBUFFER_SIZE, 0);
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if (ret < 0)
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{
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if (errno != EINTR)
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{
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printf("net_reader: recv failed sd=%d: %d\n", sd, errno);
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if (errno != EAGAIN)
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{
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return;
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}
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}
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}
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else if (ret == 0)
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{
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printf("net_reader: Client connection lost sd=%d\n", sd);
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return;
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}
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else
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{
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buffer[ret]='\0';
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printf("net_reader: Read '%s' (%d bytes)\n", buffer, ret);
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/* Echo the data back to the client */
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for (nbytes = ret, ptr = buffer; nbytes > 0; )
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{
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ret = send(sd, ptr, nbytes, 0);
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if (ret < 0)
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{
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if (errno != EINTR)
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{
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printf("net_reader: Send failed sd=%d: %d\n", sd, errno);
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return;
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}
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}
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else
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{
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nbytes -= ret;
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ptr += ret;
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}
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}
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}
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}
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}
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: net_reader
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****************************************************************************/
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void *net_reader(pthread_addr_t pvarg)
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{
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struct sockaddr_in addr;
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#ifdef POLL_HAVE_SOLINGER
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struct linger ling;
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#endif
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int listensd;
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int acceptsd;
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socklen_t addrlen;
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int optval;
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/* Configure the network */
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net_configure();
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/* Create a new TCP socket */
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listensd = socket(PF_INET, SOCK_STREAM, 0);
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if (listensd < 0)
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{
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printf("net_reader: socket failure: %d\n", errno);
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goto errout;
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}
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/* Set socket to reuse address */
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optval = 1;
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if (setsockopt(listensd, SOL_SOCKET, SO_REUSEADDR, (void*)&optval, sizeof(int)) < 0)
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{
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printf("net_reader: setsockopt SO_REUSEADDR failure: %d\n", errno);
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goto errout_with_listensd;
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}
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/* Bind the socket to a local address */
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addr.sin_family = AF_INET;
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addr.sin_port = HTONS(LISTENER_PORT);
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addr.sin_addr.s_addr = INADDR_ANY;
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if (bind(listensd, (struct sockaddr*)&addr, sizeof(struct sockaddr_in)) < 0)
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{
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printf("net_reader: bind failure: %d\n", errno);
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goto errout_with_listensd;
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}
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/* Listen for connections on the bound TCP socket */
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if (listen(listensd, 5) < 0)
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{
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printf("net_reader: listen failure %d\n", errno);
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goto errout_with_listensd;
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}
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/* Connection loop */
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for (;;)
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{
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/* Accept only one connection */
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printf("net_reader: Accepting new connections on port %d\n", LISTENER_PORT);
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addrlen = sizeof(struct sockaddr_in);
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acceptsd = accept(listensd, (struct sockaddr*)&addr, &addrlen);
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if (acceptsd < 0)
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{
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printf("net_reader: accept failure: %d\n", errno);
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continue;
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}
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printf("net_reader: Connection accepted on sd=%d\n", acceptsd);
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/* Configure to "linger" until all data is sent when the socket is closed */
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#ifdef POLL_HAVE_SOLINGER
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ling.l_onoff = 1;
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ling.l_linger = 30; /* timeout is seconds */
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if (setsockopt(acceptsd, SOL_SOCKET, SO_LINGER, &ling, sizeof(struct linger)) < 0)
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{
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printf("net_reader: setsockopt SO_LINGER failure: %d\n", errno);
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goto errout_with_acceptsd;
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}
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#endif
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/* Handle incoming messages on the connection. */
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net_receive(acceptsd);
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printf("net_reader: Closing sd=%d\n", acceptsd);
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close(acceptsd);
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}
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#ifdef POLL_HAVE_SOLINGER
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errout_with_acceptsd:
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close(acceptsd);
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#endif
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errout_with_listensd:
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close(listensd);
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errout:
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return NULL;
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}
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