1 /*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * 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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #if defined(LIBC_SCCS) && !defined(lint)
35 static char sccsid[] = "@(#)linkaddr.c 5.2 (Berkeley) 2/24/91";
36 #endif /* LIBC_SCCS and not lint */
37
38 #include <sys/types.h>
39 #include <sys/socket.h>
40 #include <net/if_dl.h>
41 #include <string.h>
42
43 /* States*/
44 #define NAMING 0
45 #define GOTONE 1
46 #define GOTTWO 2
47 #define RESET 3
48 /* Inputs */
49 #define DIGIT (4*0)
50 #define END (4*1)
51 #define DELIM (4*2)
52 #define LETTER (4*3)
53
54 void
link_addr(addr,sdl)55 link_addr(addr, sdl)
56 register const char *addr;
57 register struct sockaddr_dl *sdl;
58 {
59 register char *cp = sdl->sdl_data;
60 char *cplim = sdl->sdl_len + (char *)sdl;
61 register int byte = 0, state = NAMING, new;
62
63 bzero((char *)&sdl->sdl_family, sdl->sdl_len - 1);
64 sdl->sdl_family = AF_LINK;
65 do {
66 state &= ~LETTER;
67 if ((*addr >= '0') && (*addr <= '9')) {
68 new = *addr - '0';
69 } else if ((*addr >= 'a') && (*addr <= 'f')) {
70 new = *addr - 'a' + 10;
71 } else if ((*addr >= 'A') && (*addr <= 'F')) {
72 new = *addr - 'A' + 10;
73 } else if (*addr == 0) {
74 state |= END;
75 } else if (state == NAMING &&
76 (((*addr >= 'A') && (*addr <= 'Z')) ||
77 ((*addr >= 'a') && (*addr <= 'z'))))
78 state |= LETTER;
79 else
80 state |= DELIM;
81 addr++;
82 switch (state /* | INPUT */) {
83 case NAMING | DIGIT:
84 case NAMING | LETTER:
85 *cp++ = addr[-1]; continue;
86 case NAMING | DELIM:
87 state = RESET; sdl->sdl_nlen = cp - sdl->sdl_data; continue;
88 case GOTTWO | DIGIT:
89 *cp++ = byte; /*FALLTHROUGH*/
90 case RESET | DIGIT:
91 state = GOTONE; byte = new; continue;
92 case GOTONE | DIGIT:
93 state = GOTTWO; byte = new + (byte << 4); continue;
94 default: /* | DELIM */
95 state = RESET; *cp++ = byte; byte = 0; continue;
96 case GOTONE | END:
97 case GOTTWO | END:
98 *cp++ = byte; /* FALLTHROUGH */
99 case RESET | END:
100 break;
101 }
102 break;
103 } while (cp < cplim);
104 sdl->sdl_alen = cp - LLADDR(sdl);
105 new = cp - (char *)sdl;
106 if (new > sizeof(*sdl))
107 sdl->sdl_len = new;
108 return;
109 }
110
111 static char hexlist[] = "0123456789abcdef";
112
113 char *
link_ntoa(sdl)114 link_ntoa(sdl)
115 register const struct sockaddr_dl *sdl;
116 {
117 static char obuf[64];
118 register char *out = obuf;
119 register int i;
120 register u_char *in = (u_char *)LLADDR(sdl);
121 u_char *inlim = in + sdl->sdl_nlen;
122 int firsttime = 1;
123
124 if (sdl->sdl_nlen) {
125 bcopy(sdl->sdl_data, obuf, sdl->sdl_nlen);
126 out += sdl->sdl_nlen;
127 *out++ = ':';
128 }
129 while (in < inlim) {
130 if (firsttime) firsttime = 0; else *out++ = '.';
131 i = *in++;
132 if (i > 0xf) {
133 out[1] = hexlist[i & 0xf];
134 i >>= 4;
135 out[0] = hexlist[i];
136 out += 2;
137 } else
138 *out++ = hexlist[i];
139 }
140 *out = 0;
141 return(obuf);
142 }
143