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> |
37 | static const uint8_t hexdigits[] = "0123456789abcdef" ; |
38 | #endif |
39 | #include <net/if_dl.h> |
40 | |
41 | int |
42 | dl_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 | |
80 | int |
81 | sdl_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 | |