217 lines
6.8 KiB
C
217 lines
6.8 KiB
C
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#include <rtthread.h>
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#include "lwip/sockets.h"
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#define MAX_SERV 32 /* Maximum number of chargen services. Don't need too many */
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#define CHARGEN_THREAD_NAME "chargen"
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#if RT_THREAD_PRIORITY_MAX == 32
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#define CHARGEN_PRIORITY 20 /* Really low priority */
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#else
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#define CHARGEN_PRIORITY 200 /* Really low priority */
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#endif
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#define CHARGEN_THREAD_STACKSIZE 1024
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struct charcb
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{
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struct charcb *next;
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int socket;
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struct sockaddr_in cliaddr;
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socklen_t clilen;
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char nextchar;
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};
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static struct charcb *charcb_list = 0;
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static int do_read(struct charcb *p_charcb);
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static void close_chargen(struct charcb *p_charcb);
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/**************************************************************
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* void chargen_thread(void *arg)
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*
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* chargen task. This server will wait for connections on well
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* known TCP port number: 19. For every connection, the server will
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* write as much data as possible to the tcp port.
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**************************************************************/
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static void chargen_thread(void *arg)
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{
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int listenfd;
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struct sockaddr_in chargen_saddr;
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fd_set readset;
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fd_set writeset;
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int i, maxfdp1;
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struct charcb *p_charcb;
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/* First acquire our socket for listening for connections */
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listenfd = lwip_socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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LWIP_ASSERT("chargen_thread(): Socket create failed.", listenfd >= 0);
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memset(&chargen_saddr, 0, sizeof(chargen_saddr));
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chargen_saddr.sin_family = AF_INET;
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chargen_saddr.sin_addr.s_addr = htonl(INADDR_ANY);
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chargen_saddr.sin_port = htons(19); // Chargen server port
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if (lwip_bind(listenfd, (struct sockaddr *) &chargen_saddr, sizeof(chargen_saddr)) == -1)
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LWIP_ASSERT("chargen_thread(): Socket bind failed.", 0);
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/* Put socket into listening mode */
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if (lwip_listen(listenfd, MAX_SERV) == -1)
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LWIP_ASSERT("chargen_thread(): Listen failed.", 0);
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/* Wait forever for network input: This could be connections or data */
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for (;;)
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{
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maxfdp1 = listenfd+1;
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/* Determine what sockets need to be in readset */
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FD_ZERO(&readset);
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FD_ZERO(&writeset);
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FD_SET(listenfd, &readset);
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for (p_charcb = charcb_list; p_charcb; p_charcb = p_charcb->next)
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{
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if (maxfdp1 < p_charcb->socket + 1)
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maxfdp1 = p_charcb->socket + 1;
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FD_SET(p_charcb->socket, &readset);
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FD_SET(p_charcb->socket, &writeset);
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}
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/* Wait for data or a new connection */
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i = lwip_select(maxfdp1, &readset, &writeset, 0, 0);
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if (i == 0) continue;
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/* At least one descriptor is ready */
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if (FD_ISSET(listenfd, &readset))
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{
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/* We have a new connection request!!! */
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/* Lets create a new control block */
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p_charcb = (struct charcb *)rt_calloc(1, sizeof(struct charcb));
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if (p_charcb)
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{
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p_charcb->socket = lwip_accept(listenfd,
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(struct sockaddr *) &p_charcb->cliaddr,
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&p_charcb->clilen);
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if (p_charcb->socket < 0)
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rt_free(p_charcb);
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else
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{
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/* Keep this tecb in our list */
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p_charcb->next = charcb_list;
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charcb_list = p_charcb;
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p_charcb->nextchar = 0x21;
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}
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}
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else
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{
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/* No memory to accept connection. Just accept and then close */
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int sock;
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struct sockaddr cliaddr;
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socklen_t clilen;
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sock = lwip_accept(listenfd, &cliaddr, &clilen);
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if (sock >= 0)
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lwip_close(sock);
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}
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}
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/* Go through list of connected clients and process data */
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for (p_charcb = charcb_list; p_charcb; p_charcb = p_charcb->next)
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{
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if (FD_ISSET(p_charcb->socket, &readset))
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{
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/* This socket is ready for reading. This could be because someone typed
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* some characters or it could be because the socket is now closed. Try reading
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* some data to see. */
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if (do_read(p_charcb) < 0)
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break;
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}
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if (FD_ISSET(p_charcb->socket, &writeset))
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{
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char line[80];
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char setchar = p_charcb->nextchar;
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for( i = 0; i < 59; i++)
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{
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line[i] = setchar;
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if (++setchar == 0x7f)
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setchar = 0x21;
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}
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line[i] = 0;
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strcat(line, "\n\r");
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if (lwip_write(p_charcb->socket, line, strlen(line)) < 0)
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{
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close_chargen(p_charcb);
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break;
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}
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if (++p_charcb->nextchar == 0x7f)
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p_charcb->nextchar = 0x21;
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}
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}
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}
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}
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/**************************************************************
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* void close_chargen(struct charcb *p_charcb)
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*
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* Close the socket and remove this charcb from the list.
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**************************************************************/
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static void close_chargen(struct charcb *p_charcb)
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{
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struct charcb *p_search_charcb;
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/* Either an error or tcp connection closed on other
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* end. Close here */
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lwip_close(p_charcb->socket);
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/* Free charcb */
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if (charcb_list == p_charcb)
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charcb_list = p_charcb->next;
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else
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for (p_search_charcb = charcb_list; p_search_charcb; p_search_charcb = p_search_charcb->next)
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{
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if (p_search_charcb->next == p_charcb)
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{
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p_search_charcb->next = p_charcb->next;
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break;
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}
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}
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rt_free(p_charcb);
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}
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/**************************************************************
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* void do_read(struct charcb *p_charcb)
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*
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* Socket definitely is ready for reading. Read a buffer from the socket and
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* discard the data. If no data is read, then the socket is closed and the
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* charcb is removed from the list and freed.
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**************************************************************/
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static int do_read(struct charcb *p_charcb)
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{
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char buffer[80];
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int readcount;
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/* Read some data */
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readcount = lwip_read(p_charcb->socket, &buffer, 80);
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if (readcount <= 0)
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{
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close_chargen(p_charcb);
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return -1;
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}
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return 0;
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}
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void chargen_init(void)
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{
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rt_thread_t chargen;
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chargen = rt_thread_create(CHARGEN_THREAD_NAME,
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chargen_thread, RT_NULL,
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CHARGEN_THREAD_STACKSIZE,
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CHARGEN_PRIORITY, 5);
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if (chargen != RT_NULL) rt_thread_startup(chargen);
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}
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#ifdef RT_USING_FINSH
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#include <finsh.h>
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void chargen()
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{
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chargen_init();
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}
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FINSH_FUNCTION_EXPORT(chargen, start chargen server);
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#endif
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