1/* $NetBSD: dl_print.c,v 1.3 2016/04/06 18:04:58 christos Exp $ */
2
3/*-
4 * Copyright (c) 2014 The NetBSD Foundation, Inc.
5 * 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 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28#include <sys/cdefs.h>
29#include <sys/types.h>
30
31#ifdef _KERNEL
32__KERNEL_RCSID(0, "$NetBSD: dl_print.c,v 1.3 2016/04/06 18:04:58 christos Exp $");
33#include <sys/systm.h>
34#else
35__RCSID("$NetBSD: dl_print.c,v 1.3 2016/04/06 18:04:58 christos Exp $");
36#include <stdio.h>
37static const uint8_t hexdigits[] = "0123456789abcdef";
38#endif
39#include <net/if_dl.h>
40
41int
42dl_print(char *buf, size_t len, const struct dl_addr *dl)
43{
44 const uint8_t *ap = (const uint8_t *)dl->dl_data;
45 char abuf[256 * 3], *cp, *ecp;
46
47 ap += dl->dl_nlen;
48 cp = abuf;
49 ecp = abuf + sizeof(abuf);
50
51#define ADDC(c) do { \
52 if (cp >= ecp) {\
53 cp++; \
54 } else \
55 *cp++ = (char)(c); \
56 } while (/*CONSTCOND*/0)
57
58#define ADDX(v) do { \
59 uint8_t n = hexdigits[(v)]; \
60 ADDC(n); \
61 } while (/*CONSTCOND*/0)
62
63 for (size_t i = 0; i < dl->dl_alen; i++) {
64 ADDX((u_int)ap[i] >> 4);
65 ADDX(ap[i] & 0xf);
66 ADDC(':');
67 }
68 if (cp > abuf)
69 --cp;
70 if (ecp > abuf) {
71 if (cp < ecp)
72 *cp = '\0';
73 else
74 *--ecp = '\0';
75 }
76 return snprintf(buf, len, "%.*s/%hhu#%s",
77 (int)dl->dl_nlen, dl->dl_data, dl->dl_type, abuf);
78}
79
80int
81sdl_print(char *buf, size_t len, const void *v)
82{
83 const struct sockaddr_dl *sdl = v;
84 char abuf[LINK_ADDRSTRLEN];
85
86 if (sdl->sdl_slen == 0 && sdl->sdl_nlen == 0 && sdl->sdl_alen == 0)
87 return snprintf(buf, len, "link#%hu", sdl->sdl_index);
88
89 dl_print(abuf, sizeof(abuf), &sdl->sdl_addr);
90 return snprintf(buf, len, "[%s]:%hu", abuf, sdl->sdl_index);
91}
92