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 (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2007 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 * Function implementations to convert between link layer addresses and
31 * ascii representations of the form "x:x:x:...:x:x:x" where x is a hex
32 * number between 0x00 and 0xff; the bytes are always in network order.
33 */
34
35#include <stdio.h>
36#include <ctype.h>
37#include <stdlib.h>
38#include <sys/types.h>
39#include <net/if_dl.h>
40
41/*
42 * Converts a "size" bytes long mac address to its string representation.
43 * Currently, the "mactype" is unused, but in the future, the string
44 * can be modulated by "mactype" (IFT_* value from <net/if_types.h>)
45 */
46/* ARGSUSED */
47char *
48_link_ntoa(const unsigned char *macaddr, char *str, int size, int mactype)
49{
50	char *buf;
51	int i, n;
52
53	if (((buf = str) == NULL) &&
54	    ((buf = malloc(3 * size)) == NULL))
55		return (NULL);
56	n = sprintf(buf, "%x", *macaddr++);
57	for (i = 0; i < (size - 1); i++)
58		n += sprintf(buf+n, ":%x", *macaddr++);
59	return (buf);
60}
61
62/*
63 * Converts a string possibly representing a link address into its
64 * bit format, returning length of the address in bytes.
65 */
66uchar_t *
67_link_aton(const char *ascaddr, int *maclen)
68{
69	unsigned char cval, num = 0;
70	int idx = 0, numcolons = 0, digits = 0;
71	uchar_t *netaddr;
72	const char *cptr;
73	char lastc = ':';
74
75	while (isspace(*ascaddr))
76		ascaddr++;
77
78	/*
79	 * Find how many :'s in the string. Also sanity check
80	 * the string for valid hex chars, absence of white
81	 * spaces, not starting or ending with :, absence of
82	 * consecutive :'s, excessive digits per element
83	 * and non-null string.
84	 */
85	cptr = ascaddr;
86	while ((cval = *cptr++) != '\0') {
87		if (cval == ':') {
88			if (lastc == ':')
89				break;
90			numcolons++;
91			digits = 0;
92		} else if (!isxdigit(cval)) {
93			break;
94		} else {
95			digits++;
96		}
97
98		if (digits > 2)
99			break;
100
101		lastc = cval;
102	}
103	if ((lastc == ':') || (cval != '\0' && !isspace(cval)) ||
104	    (digits > 2)) {
105		*maclen = -1;
106		return (NULL);
107	}
108
109	if ((netaddr = malloc(numcolons + 1)) == NULL) {
110		*maclen = 0;
111		return (NULL);
112	}
113
114	for (;;) {
115		cval = *ascaddr++;
116		if (isdigit(cval)) {
117			num = (num << 4) | (cval - '0');
118		} else if (isxdigit(cval)) {
119			num = (num << 4) |
120			    (cval - (isupper(cval) ? 'A' : 'a') + 10);
121		} else if (cval == ':') {
122			netaddr[idx++] = num;
123			num = 0;
124		} else {
125			/*
126			 * We must have hit a whitespace. Stop
127			 * parsing now.
128			 */
129			netaddr[idx++] = num;
130			break;
131		}
132	}
133	*maclen = idx;
134	return (netaddr);
135}
136