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 */
47 char *
_link_ntoa(const unsigned char * macaddr,char * str,int size,int mactype)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 */
66 uchar_t *
_link_aton(const char * ascaddr,int * maclen)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