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
47/*
48 * Parses a line from /etc/ethers into its components.  The line has the form
49 * 8:0:20:1:17:c8	krypton
50 * where the first part is a 48 bit ethernet addrerss and the second is
51 * the corresponding hosts name.
52 * Returns zero if successful, non-zero otherwise.
53 */
54int
55ether_line(const char *s, struct ether_addr *e, char *hostname)
56{
57	int i;
58	unsigned int t[6];
59
60	i = sscanf(s, " %x:%x:%x:%x:%x:%x %s", &t[0], &t[1], &t[2], &t[3], &t[4], &t[5], hostname);
61	if (i != 7) return (7 - i);
62
63	for (i = 0; i < 6; i++) e->ether_addr_octet[i] = t[i];
64	return 0;
65}
66
67/*
68 * Converts a 48 bit ethernet number to its string representation.
69 */
70#define EI(i) (unsigned int)(e->ether_addr_octet[(i)])
71char *
72ether_ntoa(const struct ether_addr *e)
73{
74	static char *s;
75
76	if (s == 0)
77	{
78		s = (char *)malloc(18);
79		if (s == 0) return NULL;
80	}
81
82	s[0] = 0;
83	sprintf(s, "%x:%x:%x:%x:%x:%x", EI(0), EI(1), EI(2), EI(3), EI(4), EI(5));
84	return s;
85}
86
87/*
88 * Converts a ethernet address representation back into its 48 bits.
89 */
90struct ether_addr *
91ether_aton(const char *s)
92{
93	static struct ether_addr *ep;
94	int i;
95	unsigned int t[6];
96
97	if (ep == 0)
98	{
99		ep = (struct ether_addr *)calloc(1, sizeof (struct ether_addr));
100		if (ep == 0) return NULL;
101	}
102
103	i = sscanf(s, " %x:%x:%x:%x:%x:%x", &t[0], &t[1], &t[2], &t[3], &t[4], &t[5]);
104	if (i != 6) return NULL;
105
106	for (i = 0; i < 6; i++) ep->ether_addr_octet[i] = t[i];
107	return ep;
108}
109