usr/src/cmd/cmd-inet/usr.lib/in.daytimed/in.daytimed.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 /*
  30  * daytime inetd service - both stream and dgram based.
  31  * Return human-readable time of day.
  32  */
  33
  34 #include <sys/types.h>
  35 #include <sys/socket.h>
  36 #include <unistd.h>
  37 #include <stdio.h>
  38 #include <strings.h>
  39 #include <netinet/in.h>
  40 #include <inetsvc.h>
  41
  42
  43 #define TIMEBUF_SIZE    26
  44
  45
  46 static const char *
  47 daytime(void)
  48 {
  49         time_t          clock;
  50         static char     buf[TIMEBUF_SIZE];
  51
  52         clock = time(NULL);
  53         (void) strlcpy(buf, ctime(&clock), sizeof (buf));
  54         /*
  55          * Format of ctime is "Fri Sep 13 00:00:00 1986\n\0". To conform to the
  56          * required format as specified in RFCs 867 and 854 we replace the
  57          * "\n\0" with "\r\n".
  58          */
  59         buf[TIMEBUF_SIZE - 2] = '\r';
  60         buf[TIMEBUF_SIZE - 1] = '\n';
  61
  62         return (buf);
  63 }
  64
  65 /* ARGSUSED3 */
  66 static void
  67 daytime_dg(int s, const struct sockaddr *sap, int sa_size, const void *buf,
  68     size_t sz)
  69 {
  70         (void) safe_sendto(s, daytime(), TIMEBUF_SIZE, 0, sap, sa_size);
  71 }
  72
  73 int
  74 main(int argc, char *argv[])
  75 {
  76         opterr = 0;     /* disable getopt error msgs */
  77         switch (getopt(argc, argv, "ds")) {
  78         case 'd':
  79                 dg_template(daytime_dg, STDIN_FILENO, NULL, 0);
  80                 break;
  81         case 's':
  82                 (void) safe_write(STDIN_FILENO, daytime(), TIMEBUF_SIZE);
  83                 break;
  84         default:
  85                 return (1);
  86         }
  87
  88         return (0);
  89 }