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Diffstat (limited to 'apps/examples/poll/net_listener.c')
-rw-r--r-- | apps/examples/poll/net_listener.c | 428 |
1 files changed, 428 insertions, 0 deletions
diff --git a/apps/examples/poll/net_listener.c b/apps/examples/poll/net_listener.c new file mode 100644 index 000000000..81ad7cdcc --- /dev/null +++ b/apps/examples/poll/net_listener.c @@ -0,0 +1,428 @@ +/**************************************************************************** + * examples/poll/net_listener.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/stat.h> +#include <sys/select.h> +#include <sys/socket.h> +#include <sys/ioctl.h> + +#include <stdint.h> +#include <stdbool.h> +#include <stdio.h> +#include <unistd.h> +#include <string.h> +#include <pthread.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 + ****************************************************************************/ + +struct net_listener_s +{ + struct sockaddr_in addr; + fd_set master; + fd_set working; + char buffer[IOBUFFER_SIZE]; + int listensd; + int mxsd; +}; + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: net_closeclient + ****************************************************************************/ + +static bool net_closeclient(struct net_listener_s *nls, int sd) +{ + message("net_listener: Closing host side connection sd=%d\n", sd); + close(sd); + FD_CLR(sd, &nls->master); + + /* If we just closed the max SD, then search downward for the next biggest SD. */ + + while (FD_ISSET(nls->mxsd, &nls->master) == false) + { + nls->mxsd -= 1; + } + return true; +} + +/**************************************************************************** + * Name: net_incomingdata + ****************************************************************************/ + +static inline bool net_incomingdata(struct net_listener_s *nls, int sd) +{ + char *ptr; + int nbytes; + int ret; + + /* Read data from the socket */ + +#ifdef FIONBIO + for (;;) +#endif + { + message("net_listener: Read data from sd=%d\n", sd); + ret = recv(sd, nls->buffer, IOBUFFER_SIZE, 0); + if (ret < 0) + { + if (errno != EINTR) + { + message("net_listener: recv failed sd=%d: %d\n", sd, errno); + if (errno != EAGAIN) + { + net_closeclient(nls, sd); + return false; + } + } + } + else if (ret == 0) + { + message("net_listener: Client connection lost sd=%d\n", sd); + net_closeclient(nls, sd); + return false; + } + else + { + nls->buffer[ret]='\0'; + message("poll_listener: Read '%s' (%d bytes)\n", nls->buffer, ret); + + /* Echo the data back to the client */ + + for (nbytes = ret, ptr = nls->buffer; nbytes > 0; ) + { + ret = send(sd, ptr, nbytes, 0); + if (ret < 0) + { + if (errno != EINTR) + { + message("net_listener: Send failed sd=%d: \n", sd, errno); + net_closeclient(nls, sd); + return false; + } + } + else + { + nbytes -= ret; + ptr += ret; + } + } + } + } + return 0; +} + +/**************************************************************************** + * Name: net_connection + ****************************************************************************/ + +static inline bool net_connection(struct net_listener_s *nls) +{ + int sd; + + /* Loop until all connections have been processed */ + +#ifdef FIONBIO + for (;;) +#endif + { + message("net_listener: Accepting new connection on sd=%d\n", nls->listensd); + + sd = accept(nls->listensd, NULL, NULL); + if (sd < 0) + { + message("net_listener: accept failed: %d\n", errno); + + if (errno != EINTR) + { + return false; + } + } + else + { + /* Add the new connection to the master set */ + + message("net_listener: Connection accepted for sd=%d\n", sd); + + FD_SET(sd, &nls->master); + if (sd > nls->mxsd) + { + nls->mxsd = sd; + } + return true; + } + } + return false; +} + +/**************************************************************************** + * Name: net_mksocket + ****************************************************************************/ + +static inline bool net_mksocket(struct net_listener_s *nls) +{ + int value; + int ret; + + /* Create a listening socket */ + + message("net_listener: Initializing listener socket\n"); + nls->listensd = socket(AF_INET, SOCK_STREAM, 0); + if (nls->listensd < 0) + { + message("net_listener: socket failed: %d\n", errno); + return false; + } + + /* Configure the socket */ + + value = 1; + ret = setsockopt(nls->listensd, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int)); + if (ret < 0) + { + message("net_listener: setsockopt failed: %d\n", errno); + close(nls->listensd); + return false; + } + + /* Set the socket to non-blocking */ + +#ifdef FIONBIO + ret = ioctl(nls->listensd, FIONBIO, (char *)&value); + if (ret < 0) + { + message("net_listener: ioctl failed: %d\n", errno); + close(nls->listensd); + return false; + } +#endif + + /* Bind the socket */ + + memset(&nls->addr, 0, sizeof(struct sockaddr_in)); + nls->addr.sin_family = AF_INET; + nls->addr.sin_addr.s_addr = htonl(INADDR_ANY); + nls->addr.sin_port = htons(LISTENER_PORT); + ret = bind(nls->listensd, (struct sockaddr *)&nls->addr, sizeof(struct sockaddr_in)); + if (ret < 0) + { + message("net_listener: bind failed: %d\n", errno); + close(nls->listensd); + return false; + } + + /* Mark the socket as a listener */ + + ret = listen(nls->listensd, 32); + if (ret < 0) + { + message("net_listener: bind failed: %d\n", errno); + close(nls->listensd); + return false; + } + + return true; +} + +/**************************************************************************** + * 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); +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: net_listener + ****************************************************************************/ + +void *net_listener(pthread_addr_t pvarg) +{ + struct net_listener_s nls; + struct timeval timeout; + int nsds; + int ret; + int i; + + /* Configure uIP */ + + net_configure(); + + /* Set up a listening socket */ + + memset(&nls, 0, sizeof(struct net_listener_s)); + if (!net_mksocket(&nls)) + { + return (void*)1; + } + + /* Initialize the 'master' file descriptor set */ + + FD_ZERO(&nls.master); + nls.mxsd = nls.listensd; + FD_SET(nls.listensd, &nls.master); + + /* Set up a 3 second timeout */ + + timeout.tv_sec = NET_LISTENER_DELAY; + timeout.tv_usec = 0; + + /* Loop waiting for incoming connections or for incoming data + * on any of the connect sockets. + */ + + for (;;) + { + /* Wait on select */ + + message("net_listener: Calling select(), listener sd=%d\n", nls.listensd); + memcpy(&nls.working, &nls.master, sizeof(fd_set)); + ret = select(nls.mxsd + 1, (FAR fd_set*)&nls.working, (FAR fd_set*)NULL, (FAR fd_set*)NULL, &timeout); + if (ret < 0) + { + message("net_listener: select failed: %d\n", errno); + break; + } + + /* Check for timeout */ + + if (ret == 0) + { + message("net_listener: Timeout\n"); + continue; + } + + /* Find which descriptors caused the wakeup */ + + nsds = ret; + for (i = 0; i <= nls.mxsd && nsds > 0; i++) + { + /* Is this descriptor ready? */ + + if (FD_ISSET(i, &nls.working)) + { + /* Yes, is it our listener? */ + + message("net_listener: Activity on sd=%d\n", i); + + nsds--; + if (i == nls.listensd) + { + (void)net_connection(&nls); + } + else + { + net_incomingdata(&nls, i); + } + } + } + } + + /* Cleanup */ + +#if 0 /* Don't get here */ + for (i = 0; i <= nls.mxsd; +i++) + { + if (FD_ISSET(i, &nls.master)) + { + close(i); + } + } +#endif + return NULL; /* Keeps some compilers from complaining */ +} |