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 1990 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 * All routines necessary to deal with the file /etc/ethers.  The file
31 * contains mappings from 48 bit ethernet addresses to their corresponding
32 * hosts name.  The addresses have an ascii representation of the form
33 * "x:x:x:x:x:x" where x is a hex number between 0x00 and 0xff;  the
34 * bytes are always in network order.
35 */
36
37#include <stdio.h>
38#include <sys/types.h>
39#include <sys/socket.h>
40#include <net/if.h>
41#include <netinet/in.h>
42#include <net/if_arp.h>
43#include <netinet/if_ether.h>
44
45static char *domain; /* NIS domain name */
46static int usingyellow;
47static char *ethers = "/etc/ethers";
48
49/*
50 * Parses a line from /etc/ethers into its components.  The line has the form
51 * 8:0:20:1:17:c8	krypton
52 * where the first part is a 48 bit ethernet addrerss and the second is
53 * the corresponding hosts name.
54 * Returns zero if successful, non-zero otherwise.
55 *
56 * Arguments
57 *	s:		the string to be parsed
58 *	e:		ethernet address struct to be filled in
59 *	hostname:	hosts name to be set
60 */
61int
62ether_line(char *s, struct ether_addr *e, char *hostname)
63{
64	int i;
65	unsigned int t[6];
66
67	i = sscanf(s, " %x:%x:%x:%x:%x:%x %s",
68	    &t[0], &t[1], &t[2], &t[3], &t[4], &t[5], hostname);
69	if (i != 7) {
70		return (7 - i);
71	}
72	for (i = 0; i < 6; i++)
73		e->ether_addr_octet[i] = t[i];
74	return (0);
75}
76
77/*
78 * Converts a 48 bit ethernet number to its string representation.
79 */
80#define EI(i)	(unsigned int)(e->ether_addr_octet[(i)])
81char *
82ether_ntoa(struct ether_addr *e)
83{
84	static char *s;
85
86	if (s == 0) {
87		s = (char *)malloc(18);
88		if (s == 0)
89			return (0);
90	}
91	s[0] = 0;
92	sprintf(s, "%x:%x:%x:%x:%x:%x",
93	    EI(0), EI(1), EI(2), EI(3), EI(4), EI(5));
94	return (s);
95}
96
97/*
98 * Converts a ethernet address representation back into its 48 bits.
99 */
100struct ether_addr *
101ether_aton(char *s)
102{
103	static struct ether_addr *ep;
104	int i;
105	unsigned int t[6];
106
107	if (ep == 0) {
108		ep = (struct ether_addr *)calloc(1, sizeof (struct ether_addr));
109		if (ep == 0)
110			return (0);
111	}
112	i = sscanf(s, " %x:%x:%x:%x:%x:%x",
113	    &t[0], &t[1], &t[2], &t[3], &t[4], &t[5]);
114	if (i != 6)
115	    return ((struct ether_addr *)NULL);
116	for (i = 0; i < 6; i++)
117		ep->ether_addr_octet[i] = t[i];
118	return (ep);
119}
120