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nuttx-apps/examples/tcpecho/tcpecho_main.c

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/****************************************************************************
* examples/tcpecho/tcpecho_main.c
*
* Copyright (C) 2013 Max Holtzberg. All rights reserved.
* Copyright (C) 2008, 2011-2012 Gregory Nutt. All rights reserved.
*
* Authors: Max Holtzberg <mh@uvc.de>
* Gregory Nutt <gnutt@nuttx.org>
*
* This code is based upon the poll example from W. Richard Stevens'
* UNIX Network Programming Book.
*
* 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 <debug.h>
#include <errno.h>
#include <poll.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <net/if.h>
#include <netinet/in.h>
#include <nuttx/net/arp.h>
#include <apps/netutils/netlib.h>
#ifdef CONFIG_EXAMPLES_TCPECHO_DHCPC
# include <arpa/inet.h>
#endif
/* Here we include the header file for the application(s) we use in
* our project as defined in the config/<board-name>/defconfig file
*/
/* DHCPC may be used in conjunction with any other feature (or not) */
#ifdef CONFIG_EXAMPLES_TCPECHO_DHCPC
# include <apps/netutils/dnsclient.h>
# include <apps/netutils/dhcpc.h>
#endif
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define TCPECHO_MAXLINE 64
#define TCPECHO_POLLTIMEOUT 10000
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int tcpecho_netsetup(void);
static int tcpecho_server(void);
/****************************************************************************
* Private Functions
****************************************************************************/
static int tcpecho_netsetup()
{
/* If this task is excecutated as an NSH built-in function, then the
* network has already been configured by NSH's start-up logic.
*/
#ifndef CONFIG_NSH_BUILTIN_APPS
struct in_addr addr;
#if defined(CONFIG_EXAMPLES_TCPECHO_DHCPC) || defined(CONFIG_EXAMPLES_TCPECHO_NOMAC)
uint8_t mac[IFHWADDRLEN];
#endif
#ifdef CONFIG_EXAMPLES_TCPECHO_DHCPC
struct dhcpc_state ds;
void *handle;
#endif
/* Many embedded network interfaces must have a software assigned MAC */
#ifdef CONFIG_EXAMPLES_TCPECHO_NOMAC
mac[0] = 0x00;
mac[1] = 0xe0;
mac[2] = 0xde;
mac[3] = 0xad;
mac[4] = 0xbe;
mac[5] = 0xef;
netlib_setmacaddr("eth0", mac);
#endif
/* Set up our host address */
#ifdef CONFIG_EXAMPLES_TCPECHO_DHCPC
addr.s_addr = 0;
#else
addr.s_addr = HTONL(CONFIG_EXAMPLES_TCPECHO_IPADDR);
#endif
netlib_sethostaddr("eth0", &addr);
/* Set up the default router address */
addr.s_addr = HTONL(CONFIG_EXAMPLES_TCPECHO_DRIPADDR);
netlib_setdraddr("eth0", &addr);
/* Setup the subnet mask */
addr.s_addr = HTONL(CONFIG_EXAMPLES_TCPECHO_NETMASK);
netlib_setnetmask("eth0", &addr);
#ifdef CONFIG_EXAMPLES_TCPECHO_DHCPC
/* Set up the resolver */
dns_bind();
/* Get the MAC address of the NIC */
netlib_getmacaddr("eth0", mac);
/* Set up the DHCPC modules */
handle = dhcpc_open(&mac, IFHWADDRLEN);
/* Get an IP address. Note: there is no logic here for renewing the address in this
* example. The address should be renewed in ds.lease_time/2 seconds.
*/
if (!handle)
{
return ERROR;
}
if (dhcpc_request(handle, &ds) != OK)
{
return ERROR;
}
netlib_sethostaddr("eth0", &ds.ipaddr);
if (ds.netmask.s_addr != 0)
{
netlib_setnetmask("eth0", &ds.netmask);
}
if (ds.default_router.s_addr != 0)
{
netlib_setdraddr("eth0", &ds.default_router);
}
if (ds.dnsaddr.s_addr != 0)
{
dns_setserver(&ds.dnsaddr);
}
dhcpc_close(handle);
printf("IP: %s\n", inet_ntoa(ds.ipaddr));
#endif /* CONFIG_EXAMPLES_TCPECHO_DHCPC */
#endif /* CONFIG_NSH_BUILTIN_APPS */
return OK;
}
static int tcpecho_server(void)
{
int i, maxi, listenfd, connfd, sockfd;
int nready;
int ret;
ssize_t n;
char buf[TCPECHO_MAXLINE];
socklen_t clilen;
bool stop = false;
struct pollfd client[CONFIG_EXAMPLES_TCPECHO_NCONN];
struct sockaddr_in cliaddr, servaddr;
listenfd = socket(AF_INET, SOCK_STREAM, 0);
if (listenfd < 0)
{
perror("ERROR: failed to create socket.\n");
return ERROR;
}
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(CONFIG_EXAMPLES_TCPECHO_PORT);
ret = bind(listenfd, (struct sockaddr*)&servaddr, sizeof(servaddr));
if (ret < 0)
{
perror("ERROR: failed to bind socket.\n");
return ERROR;
}
ndbg("start listening on port: %d\n", CONFIG_EXAMPLES_TCPECHO_PORT);
ret = listen(listenfd, CONFIG_EXAMPLES_TCPECHO_BACKLOG);
if (ret < 0)
{
perror("ERROR: failed to start listening\n");
return ERROR;
}
client[0].fd = listenfd;
client[0].events = POLLRDNORM;
for (i = 1; i < CONFIG_EXAMPLES_TCPECHO_NCONN; i++)
{
client[i].fd = -1; /* -1 indicates available entry */
}
maxi = 0; /* max index into client[] array */
while (!stop)
{
nready = poll(client, maxi+1, TCPECHO_POLLTIMEOUT);
if (client[0].revents & POLLRDNORM)
{
/* new client connection */
clilen = sizeof(cliaddr);
connfd = accept(listenfd, (struct sockaddr*)&cliaddr, &clilen);
ndbg("new client: %s\n", inet_ntoa(cliaddr.sin_addr));
for (i = 1; i < CONFIG_EXAMPLES_TCPECHO_NCONN; i++)
{
if (client[i].fd < 0)
{
client[i].fd = connfd; /* save descriptor */
break;
}
}
if (i == CONFIG_EXAMPLES_TCPECHO_NCONN)
{
perror("ERROR: too many clients");
return ERROR;
}
client[i].events = POLLRDNORM;
if (i > maxi)
{
maxi = i; /* max index in client[] array */
}
if (--nready <= 0)
{
continue; /* no more readable descriptors */
}
}
for (i = 1; i <= maxi; i++)
{
/* check all clients for data */
if ((sockfd = client[i].fd) < 0)
{
continue;
}
if (client[i].revents & (POLLRDNORM | POLLERR))
{
if ( (n = read(sockfd, buf, TCPECHO_MAXLINE)) < 0)
{
if (errno == ECONNRESET)
{
/* connection reset by client */
ndbg("client[%d] aborted connection\n", i);
close(sockfd);
client[i].fd = -1;
}
else
{
perror("ERROR: readline error\n");
close(sockfd);
client[i].fd = -1;
}
}
else if (n == 0)
{
/* connection closed by client */
ndbg("client[%d] closed connection\n", i);
close(sockfd);
client[i].fd = -1;
}
else
{
if (strcmp(buf, "exit\r\n") == 0)
{
ndbg("client[%d] closed connection\n", i);
close(sockfd);
client[i].fd = -1;
}
else
{
write(sockfd, buf, n);
}
}
if (--nready <= 0)
{
break; /* no more readable descriptors */
}
}
}
}
for (i = 0; i <= maxi; i++)
{
if (client[i].fd < 0)
{
continue;
}
close(client[i].fd);
}
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* tcpecho_main
****************************************************************************/
#ifdef CONFIG_BUILD_KERNEL
int main(int argc, FAR char *argv[])
#else
int tcpecho_main(int argc, char *argv[])
#endif
{
int ret;
ret = tcpecho_netsetup();
if (ret != OK)
{
perror("ERROR: failed to setup network\n");
exit(1);
}
printf("Start echo server\n");
ret = tcpecho_server();
return ret;
}
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