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[gapil.git] / sources / TCP_iter_daytimed.c

diff --git a/sources/TCP_iter_daytimed.c b/sources/TCP_iter_daytimed.c
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+/* TCP_iter_daytimed.c
+ * 
+ * Copyright (C) 2001 Simone Piccardi
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+/****************************************************************
+ *
+ * Program daytimed: 
+ * Elementary TCP server for daytime service (port 13)
+ *
+ * Author: Simone Piccardi
+ * Apr. 2001
+ *
+ * Usage: daytimed -h give all info
+ *
+ * $Id: TCP_iter_daytimed.c,v 1.3 2003/05/02 09:55:14 piccardi Exp $
+ *
+ ****************************************************************/
+/* 
+ * Include needed headers
+ */
+#include <sys/types.h>   /* predefined types */
+#include <unistd.h>      /* include unix standard library */
+#include <arpa/inet.h>   /* IP addresses conversion utiliites */
+#include <sys/socket.h>  /* socket library */
+#include <stdio.h>      /* include standard I/O library */
+#include <time.h>
+
+#define MAXLINE 80
+#define BACKLOG 10
+/* Program begin */
+void usage(void);
+int main(int argc, char *argv[])
+{
+/* 
+ * Variables definition  
+ */
+    int list_fd, conn_fd;
+    int i;
+    struct sockaddr_in serv_add;
+    char buffer[MAXLINE];
+    time_t timeval;
+    /*
+     * Input section: decode parameters passed in the calling 
+     * Use getopt function
+     */
+    opterr = 0;         /* don't want writing to stderr */
+    while ( (i = getopt(argc, argv, "h")) != -1) {
+       switch (i) {
+       /* 
+        * Handling options 
+        */ 
+       case 'h':  
+           printf("Wrong -h option use\n");
+           usage();
+           return(0);
+           break;
+       case '?':   /* unrecognized options */
+           printf("Unrecognized options -%c\n",optopt);
+           usage();
+       default:    /* should not reached */
+           usage();
+       }
+    }
+    /* ***********************************************************
+     * 
+     *          Options processing completed
+     *
+     *               Main code beginning
+     * 
+     * ***********************************************************/
+    /* create socket */
+    if ( (list_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
+       perror("Socket creation error");
+       exit(-1);
+    }
+    /* initialize address */
+    memset((void *)&serv_add, 0, sizeof(serv_add)); /* clear server address */
+    serv_add.sin_family = AF_INET;                  /* address type is INET */
+    serv_add.sin_port = htons(13);                  /* daytime port is 13 */
+    serv_add.sin_addr.s_addr = htonl(INADDR_ANY);   /* connect from anywhere */
+    /* bind socket */
+    if (bind(list_fd, (struct sockaddr *)&serv_add, sizeof(serv_add)) < 0) {
+       perror("bind error");
+       exit(-1);
+    }
+    /* listen on socket */
+    if (listen(list_fd, BACKLOG) < 0 ) {
+       perror("listen error");
+       exit(-1);
+    }
+    /* write daytime to client */
+    while (1) {
+       if ( (conn_fd = accept(list_fd, (struct sockaddr *) NULL, NULL)) <0 ) {
+           perror("accept error");
+           exit(-1);
+       }
+       timeval = time(NULL);
+       snprintf(buffer, sizeof(buffer), "%.24s\r\n", ctime(&timeval));
+       if ( (write(conn_fd, buffer, strlen(buffer))) < 0 ) {
+           perror("write error");
+           exit(-1);
+       }
+       close(conn_fd);
+    }
+
+    /* normal exit */
+    exit(0);
+}
+/*
+ * routine to print usage info and exit
+ */
+void usage(void) {
+    printf("Simple daytime server\n");
+    printf("Usage:\n");
+    printf("  daytimed [-h] \n");
+    printf("  -h          print this help\n");
+    exit(1);
+}