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
40int
41main(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}
78