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/* $OpenBSD: inet_ntop.c,v 1.9 2014/02/05 14:20:43 millert Exp $ */
/*
* SPDX-License-Identifier: ISC
*
* 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.
*/
#include <config.h>
#if !defined(HAVE_INET_NTOP)
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <sudo_compat.h>
#ifndef EAFNOSUPPORT
# define EAFNOSUPPORT EINVAL
#endif
#ifndef NS_IN6ADDRSZ
# ifdef IN6ADDRSZ
# define NS_IN6ADDRSZ IN6ADDRSZ
# else
# define NS_IN6ADDRSZ 16
# endif
#endif
#ifndef NS_INT16SZ
# ifdef INT16SZ
# define NS_INT16SZ INT16SZ
# else
# define NS_INT16SZ 2
# endif
#endif
/*
* WARNING: Don't even consider trying to compile this on a system where
* sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
*/
/* 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 unsigned char* not an in_addr as input
* author:
* Paul Vixie, 1996.
*/
static const char *
inet_ntop4(const unsigned char * restrict src, char * restrict dst, socklen_t size)
{
const char fmt[] = "%u.%u.%u.%u";
int len;
len = snprintf(dst, size, fmt, src[0], src[1], src[2], src[3]);
if (len < 0 || (socklen_t)len >= size) {
errno = ENOSPC;
return (NULL);
}
return (dst);
}
#ifdef HAVE_STRUCT_IN6_ADDR
/* const char *
* inet_ntop6(src, dst, size)
* convert IPv6 binary address into presentation (printable) format
* author:
* Paul Vixie, 1996.
*/
static const char *
inet_ntop6(const unsigned char * restrict src, char * restrict 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 *cp, *ep;
struct { int base, len; } best, cur;
unsigned int words[NS_IN6ADDRSZ / NS_INT16SZ];
int i;
int advance;
/*
* Preprocess:
* Copy the input (bytewise) array into a wordwise array.
* Find the longest run of 0x00's in src[] for :: shorthanding.
*/
memset(words, 0, sizeof(words));
for (i = 0; i < NS_IN6ADDRSZ; i++)
words[i / 2] |= (src[i] << ((1 - (i & 1)) << 3));
best.base = -1;
best.len = 0;
cur.base = -1;
cur.len = 0;
for (i = 0; i < (NS_IN6ADDRSZ / NS_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.
*/
cp = dst;
ep = dst + size;
for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ) && cp < ep; 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) {
if (cp + 1 >= ep) {
errno = ENOSPC;
return (NULL);
}
*cp++ = ':';
}
continue;
}
/* Are we following an initial run of 0x00s or any real hex? */
if (i != 0) {
if (cp + 1 >= ep) {
errno = ENOSPC;
return (NULL);
}
*cp++ = ':';
}
/* Is this address an encapsulated IPv4? */
if (i == 6 && best.base == 0 &&
(best.len == 6 ||
(best.len == 7 && words[7] != 0x0001) ||
(best.len == 5 && words[5] == 0xffff))) {
if (!inet_ntop4(src + 12, cp, (socklen_t)(ep - cp)))
return (NULL);
cp += strlen(cp);
break;
}
advance = snprintf(cp, (size_t)(ep - cp), "%x", words[i]);
if (advance <= 0 || advance >= ep - cp) {
errno = ENOSPC;
return (NULL);
}
cp += advance;
}
/* Was it a trailing run of 0x00's? */
if (best.base != -1 &&
(best.base + best.len) == (NS_IN6ADDRSZ / NS_INT16SZ)) {
if (cp + 1 >= ep) {
errno = ENOSPC;
return (NULL);
}
*cp++ = ':';
}
if (cp + 1 >= ep) {
errno = ENOSPC;
return (NULL);
}
*cp++ = '\0';
return (dst);
}
#endif /* HAVE_STRUCT_IN6_ADDR */
/* const 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).
* author:
* Paul Vixie, 1996.
*/
const char *
sudo_inet_ntop(int af, const void * restrict src, char * restrict dst, socklen_t size)
{
switch (af) {
case AF_INET:
return (inet_ntop4(src, dst, size));
#ifdef HAVE_STRUCT_IN6_ADDR
case AF_INET6:
return (inet_ntop6(src, dst, size));
#endif
default:
errno = EAFNOSUPPORT;
return (NULL);
}
/* NOTREACHED */
}
#endif /* !HAVE_INET_NTOP */
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