1/*
2 * Copyright (c) 1999-2008 Apple Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
7 * Reserved.  This file contains Original Code and/or Modifications of
8 * Original Code as defined in and that are subject to the Apple Public
9 * Source License Version 1.1 (the "License").  You may not use this file
10 * except in compliance with the License.  Please obtain a copy of the
11 * License at http://www.apple.com/publicsource and read it before using
12 * this file.
13 *
14 * The Original Code and all software distributed under the License are
15 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
19 * License for the specific language governing rights and limitations
20 * under the License.
21 *
22 * @APPLE_LICENSE_HEADER_END@
23 */
24#if !defined(lint) && defined(SCCSIDS)
25static  char sccsid[] = "@(#)ether_addr.c	1.2 88/05/10 4.0NFSSRC; from 1.9 88/02/08 Copyr 1985 Sun Micro";
26#endif
27
28/*
29 * Copyright (c) 1985 by Sun Microsystems, Inc.
30 *
31 * All routines necessary to deal with the file /etc/ethers.  The file
32 * contains mappings from 48 bit ethernet addresses to their corresponding
33 * hosts name.  The addresses have an ascii representation of the form
34 * "x:x:x:x:x:x" where x is a hex number between 0x00 and 0xff;  the
35 * bytes are always in network order.
36 */
37
38#include <stdlib.h>
39#include <string.h>
40#include <stdio.h>
41#include <sys/types.h>
42#include <sys/socket.h>
43#include <net/if.h>
44#include <netinet/in.h>
45#include <netinet/if_ether.h>
46
47static const 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 */
56int
57ether_line(const char *s, struct ether_addr *e, char *hostname)
58{
59	int i;
60	unsigned int t[6];
61
62	i = sscanf(s, " %x:%x:%x:%x:%x:%x %s", &t[0], &t[1], &t[2], &t[3], &t[4], &t[5], hostname);
63	if (i != 7) return (7 - i);
64
65	for (i = 0; i < 6; i++) e->ether_addr_octet[i] = t[i];
66	return 0;
67}
68
69/*
70 * Converts a 48 bit ethernet number to its string representation.
71 */
72#define EI(i) (unsigned int)(e->ether_addr_octet[(i)])
73char *
74ether_ntoa(const struct ether_addr *e)
75{
76	static char *s;
77
78	if (s == 0)
79	{
80		s = (char *)malloc(18);
81		if (s == 0) return NULL;
82	}
83
84	s[0] = 0;
85	sprintf(s, "%x:%x:%x:%x:%x:%x", EI(0), EI(1), EI(2), EI(3), EI(4), EI(5));
86	return s;
87}
88
89/*
90 * Converts a ethernet address representation back into its 48 bits.
91 */
92struct ether_addr *
93ether_aton(const char *s)
94{
95	static struct ether_addr *ep;
96	int i;
97	unsigned int t[6];
98
99	if (ep == 0)
100	{
101		ep = (struct ether_addr *)calloc(1, sizeof (struct ether_addr));
102		if (ep == 0) return NULL;
103	}
104
105	i = sscanf(s, " %x:%x:%x:%x:%x:%x", &t[0], &t[1], &t[2], &t[3], &t[4], &t[5]);
106	if (i != 6) return NULL;
107
108	for (i = 0; i < 6; i++) ep->ether_addr_octet[i] = t[i];
109	return ep;
110}
111