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/* 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 "apr_private.h"
#include "apr_arch_networkio.h"
#include "apr_strings.h"
#if APR_HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if APR_HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if APR_HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if APR_HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#include <string.h>
#if APR_HAVE_ERRNO_H
#include <errno.h>
#endif
#include <stdio.h>
#ifndef IN6ADDRSZ
#define IN6ADDRSZ 16
#endif
#ifndef INT16SZ
#define INT16SZ sizeof(apr_int16_t)
#endif
#ifndef __P
#define __P(x) x
#endif
#if !defined(EAFNOSUPPORT) && defined(WSAEAFNOSUPPORT)
#define EAFNOSUPPORT WSAEAFNOSUPPORT
#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.
*/
static const char *inet_ntop4 __P((const unsigned char *src, char *dst, apr_size_t size));
#if APR_HAVE_IPV6
static const char *inet_ntop6 __P((const unsigned char *src, char *dst, apr_size_t size));
#endif
/* 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 *
apr_inet_ntop(int af, const void *src, char *dst, apr_size_t size)
{
switch (af) {
case AF_INET:
return (inet_ntop4(src, dst, size));
#if APR_HAVE_IPV6
case AF_INET6:
return (inet_ntop6(src, dst, size));
#endif
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 u_char* not an in_addr as input
* author:
* Paul Vixie, 1996.
*/
static const char *
inet_ntop4(const unsigned char *src, char *dst, apr_size_t size)
{
const apr_size_t MIN_SIZE = 16; /* space for 255.255.255.255\0 */
int n = 0;
char *next = dst;
if (size < MIN_SIZE) {
errno = ENOSPC;
return NULL;
}
do {
unsigned char u = *src++;
if (u > 99) {
*next++ = '0' + u/100;
u %= 100;
*next++ = '0' + u/10;
u %= 10;
}
else if (u > 9) {
*next++ = '0' + u/10;
u %= 10;
}
*next++ = '0' + u;
*next++ = '.';
n++;
} while (n < 4);
*--next = 0;
return dst;
}
#if APR_HAVE_IPV6
/* 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 *src, char *dst, apr_size_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 = {-1, 0}, cur = {-1, 0};
unsigned int words[IN6ADDRSZ / INT16SZ];
int i;
const unsigned char *next_src, *src_end;
unsigned int *next_dest;
/*
* Preprocess:
* Copy the input (bytewise) array into a wordwise array.
* Find the longest run of 0x00's in src[] for :: shorthanding.
*/
next_src = src;
src_end = src + IN6ADDRSZ;
next_dest = words;
i = 0;
do {
unsigned int next_word = (unsigned int)*next_src++;
next_word <<= 8;
next_word |= (unsigned int)*next_src++;
*next_dest++ = next_word;
if (next_word == 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;
}
}
i++;
} while (next_src < src_end);
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);) {
/* Are we inside the best run of 0x00's? */
if (i == best.base) {
*tp++ = ':';
i += best.len;
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 += apr_snprintf(tp, sizeof tmp - (tp - tmp), "%x", words[i]);
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 ((apr_size_t)(tp - tmp) > size) {
errno = ENOSPC;
return (NULL);
}
strcpy(dst, tmp);
return (dst);
}
#endif
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