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