usr/src/cmd/ypcmd/stdethers.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 1987-1990,2002 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 #include <sys/types.h>
  30 #include <sys/ethernet.h>
  31
  32 #include <netdb.h>
  33 #include <stdio.h>
  34 #include <strings.h>
  35
  36 /*
  37  * Filter to convert addresses in /etc/ethers file to standard form
  38  */
  39
  40 int
  41 main(int argc, char **argv)
  42 {
  43         /*
  44          * The hostname buffer must be at least as large as the line buffer
  45          * to avoid buffer overflows when ether_line(3SOCKET) is called.
  46          * We simply use the same size for both buffers to be safe.
  47          */
  48         char line[MAXHOSTNAMELEN + 256], *lf, hostname[sizeof (line)];
  49         struct ether_addr e;
  50         FILE *in;
  51
  52         if (argc > 1) {
  53                 in = fopen(argv[1], "r");
  54                 if (in == NULL) {
  55                         fprintf(stderr,
  56                             "%s: can't open %s\n", argv[0], argv[1]);
  57                         return (1);
  58                 }
  59         } else {
  60                 in = stdin;
  61         }
  62         while (fgets(line, sizeof (line), in) != NULL) {
  63                 lf = strchr(line, '\n');
  64                 if (lf != NULL)
  65                         *lf = '\0';
  66                 if ((line[0] == '#') || (line[0] == '\0'))
  67                         continue;
  68                 if (ether_line(line, &e, hostname) == 0) {
  69                         (void) fprintf(stdout, "%s\t%s\n", ether_ntoa(&e),
  70                             hostname);
  71                 } else {
  72                         (void) fprintf(stderr,
  73                             "%s: ignoring line: %s\n", argv[0], line);
  74                 }
  75         }
  76         return (0);
  77 }