2
* Copyright (C) 1996-2001 Internet Software Consortium.
4
* Permission to use, copy, modify, and distribute this software for any
5
* purpose with or without fee is hereby granted, provided that the above
6
* copyright notice and this permission notice appear in all copies.
8
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
9
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
10
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
11
* INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
12
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
13
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
14
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
15
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20
#include "system/network.h"
23
#define NS_IN6ADDRSZ 16
26
* WARNING: Don't even consider trying to compile this on a system where
27
* sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
30
static const char *inet_ntop4(const unsigned char *src, char *dst,
34
static const char *inet_ntop6(const unsigned char *src, char *dst,
39
* isc_net_ntop(af, src, dst, size)
40
* convert a network format address to presentation format.
42
* pointer to presentation format address (`dst'), or NULL (see errno).
47
rep_inet_ntop(int af, const void *src, char *dst, socklen_t size)
51
return (inet_ntop4(src, dst, size));
54
return (inet_ntop6(src, dst, size));
64
* inet_ntop4(src, dst, size)
65
* format an IPv4 address
70
* (2) takes a unsigned char* not an in_addr as input
75
inet_ntop4(const unsigned char *src, char *dst, socklen_t size)
77
static const char *fmt = "%u.%u.%u.%u";
78
char tmp[sizeof "255.255.255.255"];
81
len = snprintf(tmp, sizeof tmp, fmt, src[0], src[1], src[2], src[3]);
86
memcpy(dst, tmp, len + 1);
92
* isc_inet_ntop6(src, dst, size)
93
* convert IPv6 binary address into presentation (printable) format
99
inet_ntop6(const unsigned char *src, char *dst, socklen_t size)
102
* Note that int32_t and int16_t need only be "at least" large enough
103
* to contain a value of the specified size. On some systems, like
104
* Crays, there is no such thing as an integer variable with 16 bits.
105
* Keep this in mind if you think this function should have been coded
106
* to use pointer overlays. All the world's not a VAX.
108
char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp;
109
struct { int base, len; } best, cur;
110
unsigned int words[NS_IN6ADDRSZ / NS_INT16SZ];
115
* Copy the input (bytewise) array into a wordwise array.
116
* Find the longest run of 0x00's in src[] for :: shorthanding.
118
memset(words, '\0', sizeof words);
119
for (i = 0; i < NS_IN6ADDRSZ; i++)
120
words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));
125
for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) {
128
cur.base = i, cur.len = 1;
132
if (cur.base != -1) {
133
if (best.base == -1 || cur.len > best.len)
139
if (cur.base != -1) {
140
if (best.base == -1 || cur.len > best.len)
143
if (best.base != -1 && best.len < 2)
150
for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) {
151
/* Are we inside the best run of 0x00's? */
152
if (best.base != -1 && i >= best.base &&
153
i < (best.base + best.len)) {
158
/* Are we following an initial run of 0x00s or any real hex? */
161
/* Is this address an encapsulated IPv4? */
162
if (i == 6 && best.base == 0 &&
163
(best.len == 6 || (best.len == 5 && words[5] == 0xffff))) {
164
if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp)))
169
inc = snprintf(tp, 5, "%x", words[i]);
175
/* Was it a trailing run of 0x00's? */
176
if (best.base != -1 && (best.base + best.len) ==
177
(NS_IN6ADDRSZ / NS_INT16SZ))
182
* Check for overflow, copy, and we're done.
184
if ((size_t)(tp - tmp) > size) {
188
memcpy(dst, tmp, tp - tmp);
191
#endif /* AF_INET6 */