1 /*-
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #if defined(LIBC_SCCS) && !defined(lint)
31 static char sccsid[] = "@(#)linkaddr.c 8.1 (Berkeley) 6/4/93";
32 #endif /* LIBC_SCCS and not lint */
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD: stable/10/lib/libc/net/linkaddr.c 309690 2016-12-07 23:20:26Z glebius $");
35
36 #include <sys/types.h>
37 #include <sys/socket.h>
38 #include <net/if.h>
39 #include <net/if_dl.h>
40 #include <string.h>
41
42 /* States*/
43 #define NAMING 0
44 #define GOTONE 1
45 #define GOTTWO 2
46 #define RESET 3
47 /* Inputs */
48 #define DIGIT (4*0)
49 #define END (4*1)
50 #define DELIM (4*2)
51 #define LETTER (4*3)
52
53 void
link_addr(addr,sdl)54 link_addr(addr, sdl)
55 const char *addr;
56 struct sockaddr_dl *sdl;
57 {
58 char *cp = sdl->sdl_data;
59 char *cplim = sdl->sdl_len + (char *)sdl;
60 int byte = 0, state = NAMING, new;
61
62 bzero((char *)&sdl->sdl_family, sdl->sdl_len - 1);
63 sdl->sdl_family = AF_LINK;
64 do {
65 state &= ~LETTER;
66 if ((*addr >= '0') && (*addr <= '9')) {
67 new = *addr - '0';
68 } else if ((*addr >= 'a') && (*addr <= 'f')) {
69 new = *addr - 'a' + 10;
70 } else if ((*addr >= 'A') && (*addr <= 'F')) {
71 new = *addr - 'A' + 10;
72 } else if (*addr == 0) {
73 state |= END;
74 } else if (state == NAMING &&
75 (((*addr >= 'A') && (*addr <= 'Z')) ||
76 ((*addr >= 'a') && (*addr <= 'z'))))
77 state |= LETTER;
78 else
79 state |= DELIM;
80 addr++;
81 switch (state /* | INPUT */) {
82 case NAMING | DIGIT:
83 case NAMING | LETTER:
84 *cp++ = addr[-1];
85 continue;
86 case NAMING | DELIM:
87 state = RESET;
88 sdl->sdl_nlen = cp - sdl->sdl_data;
89 continue;
90 case GOTTWO | DIGIT:
91 *cp++ = byte;
92 /* FALLTHROUGH */
93 case RESET | DIGIT:
94 state = GOTONE;
95 byte = new;
96 continue;
97 case GOTONE | DIGIT:
98 state = GOTTWO;
99 byte = new + (byte << 4);
100 continue;
101 default: /* | DELIM */
102 state = RESET;
103 *cp++ = byte;
104 byte = 0;
105 continue;
106 case GOTONE | END:
107 case GOTTWO | END:
108 *cp++ = byte;
109 /* FALLTHROUGH */
110 case RESET | END:
111 break;
112 }
113 break;
114 } while (cp < cplim);
115 sdl->sdl_alen = cp - LLADDR(sdl);
116 new = cp - (char *)sdl;
117 if (new > sizeof(*sdl))
118 sdl->sdl_len = new;
119 return;
120 }
121
122 static const char hexlist[] = "0123456789abcdef";
123
124 char *
link_ntoa(sdl)125 link_ntoa(sdl)
126 const struct sockaddr_dl *sdl;
127 {
128 static char obuf[64];
129 _Static_assert(sizeof(obuf) >= IFNAMSIZ + 20, "obuf is too small");
130 char *out;
131 const u_char *in, *inlim;
132 int namelen, i, rem;
133
134 namelen = (sdl->sdl_nlen <= IFNAMSIZ) ? sdl->sdl_nlen : IFNAMSIZ;
135
136 out = obuf;
137 rem = sizeof(obuf);
138 if (namelen > 0) {
139 bcopy(sdl->sdl_data, out, namelen);
140 out += namelen;
141 rem -= namelen;
142 if (sdl->sdl_alen > 0) {
143 *out++ = ':';
144 rem--;
145 }
146 }
147
148 in = (const u_char *)sdl->sdl_data + sdl->sdl_nlen;
149 inlim = in + sdl->sdl_alen;
150
151 while (in < inlim && rem > 1) {
152 if (in != (const u_char *)sdl->sdl_data + sdl->sdl_nlen) {
153 *out++ = '.';
154 rem--;
155 }
156 i = *in++;
157 if (i > 0xf) {
158 if (rem < 3)
159 break;
160 *out++ = hexlist[i >> 4];
161 *out++ = hexlist[i & 0xf];
162 rem -= 2;
163 } else {
164 if (rem < 2)
165 break;
166 *out++ = hexlist[i];
167 rem--;
168 }
169 }
170 *out = 0;
171 return (obuf);
172 }
173