usr/src/cmd/cmd-inet/usr.lib/in.discardd/in.discardd.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  * discard inetd service - both stream and dgram based.
  31  */
  32
  33 #include <sys/types.h>
  34 #include <sys/socket.h>
  35 #include <unistd.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <netinet/in.h>
  39 #include <inetsvc.h>
  40
  41
  42 static void
  43 discard_stream(int s, char *argv[])
  44 {
  45         char buffer[BUFSIZ];
  46
  47         setproctitle("discard", s, argv);
  48         while (read(s, buffer, sizeof (buffer)) > 0)
  49                 ;
  50 }
  51
  52 /* ARGSUSED0 */
  53 static void
  54 noop(int s, const struct sockaddr *sap, int sa_size, const void *buf, size_t sz)
  55 {
  56 }
  57
  58 int
  59 main(int argc, char *argv[])
  60 {
  61         opterr = 0;     /* disable getopt error msgs */
  62         switch (getopt(argc, argv, "ds")) {
  63         case 'd':
  64                 /*
  65                  * We don't need to do any work since dg_template consumes the
  66                  * datagrams for us, and we just ignore them.
  67                  */
  68                 dg_template(noop, STDIN_FILENO, NULL, 0);
  69                 break;
  70         case 's':
  71                 discard_stream(STDIN_FILENO, argv);
  72                 break;
  73         default:
  74                 return (1);
  75         }
  76
  77         return (0);
  78 }