/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright (c) 1996 by Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include "mt.h"
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <strings.h>
#include <netdb.h>
#include <stdio.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <errno.h>
static const char *inet_ntop4(const uchar_t *, char *, socklen_t);
static const char *inet_ntop6(const uchar_t *, char *, socklen_t);
/*
* char *
* inet_ntop(af, src, dst, size)
* convert a network format address to presentation format.
* return:
* pointer to presentation format address (`dst'), or NULL (see errno).
*/
const char *
inet_ntop(int af, const void *src, char *dst, socklen_t size)
{
switch (af) {
case AF_INET:
return (inet_ntop4(src, dst, size));
case AF_INET6:
return (inet_ntop6(src, dst, size));
default:
errno = EAFNOSUPPORT;
return (NULL);
}
/* NOTREACHED */
}
/*
* const char *
* inet_ntop4(src, dst, size)
* format an IPv4 address, more or less like inet_ntoa()
* return:
* `dst' (as a const)
* notes:
* (1) uses no statics
* (2) takes a uchar_t* not an in_addr as input
*/
#ifdef SPRINTF_CHAR
/* CSTYLED */
#define SPRINTF(x) strlen(sprintf/**/x)
#else
#define SPRINTF(x) ((size_t)sprintf x)
#endif
static const char *
inet_ntop4(const uchar_t *src, char *dst, socklen_t size)
{
static const char fmt[] = "%u.%u.%u.%u";
char tmp[sizeof ("255.255.255.255")];
if (SPRINTF((tmp, fmt, src[0], src[1], src[2], src[3])) > size) {
errno = ENOSPC;
return (NULL);
}
(void) strcpy(dst, tmp);
return (dst);
}
/*
* const char *
* inet_ntop6(src, dst, size)
* convert IPv6 binary address into presentation (printable) format
*/
#define INADDRSZ 4
#define IN6ADDRSZ 16
#define INT16SZ 2
static const char *
inet_ntop6(const uchar_t *src, char *dst, socklen_t size)
{
/*
* Note that int32_t and int16_t need only be "at least" large enough
* to contain a value of the specified size. On some systems, like
* Crays, there is no such thing as an integer variable with 16 bits.
* Keep this in mind if you think this function should have been coded
* to use pointer overlays. All the world's not a VAX.
*/
char tmp[sizeof ("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")], *tp;
struct { int base, len; } best, cur;
uint_t words[IN6ADDRSZ / INT16SZ];
int i;
/*
* Preprocess:
* Copy the input (bytewise) array into a wordwise array.
* Find the longest run of 0x00's in src[] for :: shorthanding.
*/
(void) memset(words, '\0', sizeof (words));
for (i = 0; i < IN6ADDRSZ; i++)
words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));
best.base = -1;
cur.base = -1;
for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++) {
if (words[i] == 0) {
if (cur.base == -1)
cur.base = i, cur.len = 1;
else
cur.len++;
} else {
if (cur.base != -1) {
if (best.base == -1 || cur.len > best.len)
best = cur;
cur.base = -1;
}
}
}
if (cur.base != -1) {
if (best.base == -1 || cur.len > best.len)
best = cur;
}
if (best.base != -1 && best.len < 2)
best.base = -1;
/*
* Format the result.
*/
tp = tmp;
for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++) {
/* Are we inside the best run of 0x00's? */
if (best.base != -1 && i >= best.base &&
i < (best.base + best.len)) {
if (i == best.base)
*tp++ = ':';
continue;
}
/* Are we following an initial run of 0x00s or any real hex? */
if (i != 0)
*tp++ = ':';
/* Is this address an encapsulated IPv4? */
if (i == 6 && best.base == 0 &&
(best.len == 6 || (best.len == 5 && words[5] == 0xffff))) {
if (!inet_ntop4(src+12, tp, sizeof (tmp) - (tp - tmp)))
return (NULL);
tp += strlen(tp);
break;
}
tp += SPRINTF((tp, "%x", words[i]));
}
/* Was it a trailing run of 0x00's? */
if (best.base != -1 && (best.base + best.len) == (IN6ADDRSZ / INT16SZ))
*tp++ = ':';
*tp++ = '\0';
/*
* Check for overflow, copy, and we're done.
*/
if ((int)(tp - tmp) > size) {
errno = ENOSPC;
return (NULL);
}
(void) strcpy(dst, tmp);
return (dst);
}