/* This is from the BIND 4.9.4 release, modified to compile by itself *//* 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. */#ifndef HAVE_INET_NTOP#include "config_unix.h"#include "config_win32.h"#include "inet_ntop.h"#define	IN6ADDRSZ	16#define	INT16SZ		 2#ifndef	AF_INET6#define	AF_INET6	AF_MAX+1	/* just to let this compile */#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(const u_char *src, char *dst, size_t size);static const char *inet_ntop6(const u_char *src, char *dst, size_t size);/* 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 *inet_ntop(af, src, dst, size)	int af;	const void *src;	char *dst;	size_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 u_char* not an in_addr as input * author: *	Paul Vixie, 1996. */static const char *inet_ntop4(src, dst, size)	const u_char *src;	char *dst;	size_t size;{	static const char fmt[] = "%u.%u.%u.%u";	char tmp[sizeof "255.255.255.255"];	sprintf(tmp, fmt, src[0], src[1], src[2], src[3]);	if ((size_t)strlen(tmp) > size) {		errno = ENOSPC;		return (NULL);	}	strcpy(dst, tmp);	return (dst);}/* const char * * inet_ntop6(src, dst, size) *	convert IPv6 binary address into presentation (printable) format * author: *	Paul Vixie, 1996. */static const char *inet_ntop6(src, dst, size)	const u_char *src;	char *dst;	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, cur;	uint32_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.	 */	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;		}		sprintf(tp, "%x", words[i]);		tp += strlen(tp);	}	/* 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 ((size_t) (tp - tmp) > size) {		errno = ENOSPC;		return (NULL);	}	strcpy(dst, tmp);	return (dst);}#endif