1 /* $NetBSD: in6_print.c,v 1.1 2014/12/02 19:36:58 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
30 #include <sys/types.h>
31 #ifdef _KERNEL
32 __KERNEL_RCSID(0, "$NetBSD: in6_print.c,v 1.1 2014/12/02 19:36:58 christos Exp $");
33 #include <sys/systm.h>
34 #else
35 __RCSID("$NetBSD: in6_print.c,v 1.1 2014/12/02 19:36:58 christos Exp $");
36 #include <stdio.h>
37 #define s6_addr32 __u6_addr.__u6_addr32
38 static const uint8_t hexdigits[] = "0123456789abcdef";
39 #endif
40
41 #include <netinet/in.h>
42
43 int
in6_print(char * buf,size_t len,const struct in6_addr * ia6)44 in6_print(char *buf, size_t len, const struct in6_addr *ia6)
45 {
46 int i;
47 char *bp;
48 char *cp, *ecp;
49 const uint16_t *a;
50 const uint8_t *d;
51 int dcolon = 0;
52
53 if (IN6_IS_ADDR_V4MAPPED(ia6)) {
54 char buf4[INET_ADDRSTRLEN];
55 struct in_addr ia = { .s_addr = ia6->s6_addr32[3] };
56 in_print(buf4, sizeof(buf4), &ia);
57 return snprintf(buf, len, "::ffff:%s", buf4);
58 }
59
60 #define ADDC(c) do { \
61 if (cp >= ecp) {\
62 cp++; \
63 } else \
64 *cp++ = (char)(c); \
65 } while (/*CONSTCOND*/0)
66 #define ADDX(v) do { \
67 uint8_t n = hexdigits[(v)]; \
68 ADDC(n); \
69 if (cp == bp && n == '0') \
70 cp--; \
71 } while (/*CONSTCOND*/0)
72
73 cp = buf;
74 ecp = buf + len;
75 a = (const uint16_t *)ia6;
76 for (i = 0; i < 8; i++) {
77 if (dcolon == 1) {
78 if (*a == 0) {
79 if (i == 7)
80 ADDC(':');
81 a++;
82 continue;
83 } else
84 dcolon = 2;
85 }
86 if (*a == 0) {
87 if (dcolon == 0 && *(a + 1) == 0) {
88 if (i == 0)
89 ADDC(':');
90 ADDC(':');
91 dcolon = 1;
92 } else {
93 ADDC('0');
94 ADDC(':');
95 }
96 a++;
97 continue;
98 }
99 d = (const u_char *)a;
100 bp = cp + 1;
101
102 ADDX((u_int)*d >> 4);
103 ADDX(*d & 0xf);
104 d++;
105 ADDX((u_int)*d >> 4);
106 ADDX(*d & 0xf);
107 ADDC(':');
108 a++;
109 }
110 if (cp > buf)
111 --cp;
112 if (ecp > buf) {
113 if (cp < ecp)
114 *cp = '\0';
115 else
116 *--ecp = '\0';
117 }
118 return (int)(cp - buf);
119 }
120
121 int
sin6_print(char * buf,size_t len,const void * v)122 sin6_print(char *buf, size_t len, const void *v)
123 {
124 const struct sockaddr_in6 *sin6 = v;
125 const struct in6_addr *ia6 = &sin6->sin6_addr;
126 char abuf[INET6_ADDRSTRLEN];
127
128 if (!sin6->sin6_port)
129 return in6_print(buf, len, ia6);
130 in6_print(abuf, sizeof(abuf), ia6);
131 return snprintf(buf, len, "[%s]:%hu", abuf, ntohs(sin6->sin6_port));
132 }
133