17c478bd9Sstevel@tonic-gate /*
29525b14bSRao Shoaib  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
37c478bd9Sstevel@tonic-gate  * Copyright (c) 1998,1999 by Internet Software Consortium.
47c478bd9Sstevel@tonic-gate  *
57c478bd9Sstevel@tonic-gate  * Permission to use, copy, modify, and distribute this software for any
67c478bd9Sstevel@tonic-gate  * purpose with or without fee is hereby granted, provided that the above
77c478bd9Sstevel@tonic-gate  * copyright notice and this permission notice appear in all copies.
87c478bd9Sstevel@tonic-gate  *
99525b14bSRao Shoaib  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
109525b14bSRao Shoaib  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
119525b14bSRao Shoaib  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
129525b14bSRao Shoaib  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
139525b14bSRao Shoaib  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
149525b14bSRao Shoaib  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
159525b14bSRao Shoaib  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
167c478bd9Sstevel@tonic-gate  */
177c478bd9Sstevel@tonic-gate 
187c478bd9Sstevel@tonic-gate #if defined(LIBC_SCCS) && !defined(lint)
199525b14bSRao Shoaib static const char rcsid[] = "$Id: inet_cidr_ntop.c,v 1.7 2006/10/11 02:18:18 marka Exp $";
207c478bd9Sstevel@tonic-gate #endif
217c478bd9Sstevel@tonic-gate 
227c478bd9Sstevel@tonic-gate #include "port_before.h"
237c478bd9Sstevel@tonic-gate 
247c478bd9Sstevel@tonic-gate #include <sys/types.h>
257c478bd9Sstevel@tonic-gate #include <sys/socket.h>
267c478bd9Sstevel@tonic-gate #include <netinet/in.h>
277c478bd9Sstevel@tonic-gate #include <arpa/nameser.h>
287c478bd9Sstevel@tonic-gate #include <arpa/inet.h>
297c478bd9Sstevel@tonic-gate 
307c478bd9Sstevel@tonic-gate #include <errno.h>
317c478bd9Sstevel@tonic-gate #include <stdio.h>
327c478bd9Sstevel@tonic-gate #include <string.h>
337c478bd9Sstevel@tonic-gate #include <stdlib.h>
347c478bd9Sstevel@tonic-gate 
357c478bd9Sstevel@tonic-gate #include "port_after.h"
367c478bd9Sstevel@tonic-gate 
377c478bd9Sstevel@tonic-gate #ifdef SPRINTF_CHAR
387c478bd9Sstevel@tonic-gate # define SPRINTF(x) strlen(sprintf/**/x)
397c478bd9Sstevel@tonic-gate #else
407c478bd9Sstevel@tonic-gate # define SPRINTF(x) ((size_t)sprintf x)
417c478bd9Sstevel@tonic-gate #endif
427c478bd9Sstevel@tonic-gate 
439525b14bSRao Shoaib static char *
449525b14bSRao Shoaib inet_cidr_ntop_ipv4(const u_char *src, int bits, char *dst, size_t size);
459525b14bSRao Shoaib static char *
469525b14bSRao Shoaib inet_cidr_ntop_ipv6(const u_char *src, int bits, char *dst, size_t size);
477c478bd9Sstevel@tonic-gate 
489525b14bSRao Shoaib /*%
497c478bd9Sstevel@tonic-gate  * char *
507c478bd9Sstevel@tonic-gate  * inet_cidr_ntop(af, src, bits, dst, size)
517c478bd9Sstevel@tonic-gate  *	convert network address from network to presentation format.
527c478bd9Sstevel@tonic-gate  *	"src"'s size is determined from its "af".
537c478bd9Sstevel@tonic-gate  * return:
547c478bd9Sstevel@tonic-gate  *	pointer to dst, or NULL if an error occurred (check errno).
557c478bd9Sstevel@tonic-gate  * note:
567c478bd9Sstevel@tonic-gate  *	192.5.5.1/28 has a nonzero host part, which means it isn't a network
577c478bd9Sstevel@tonic-gate  *	as called for by inet_net_ntop() but it can be a host address with
587c478bd9Sstevel@tonic-gate  *	an included netmask.
597c478bd9Sstevel@tonic-gate  * author:
607c478bd9Sstevel@tonic-gate  *	Paul Vixie (ISC), October 1998
617c478bd9Sstevel@tonic-gate  */
627c478bd9Sstevel@tonic-gate char *
inet_cidr_ntop(int af,const void * src,int bits,char * dst,size_t size)637c478bd9Sstevel@tonic-gate inet_cidr_ntop(int af, const void *src, int bits, char *dst, size_t size) {
647c478bd9Sstevel@tonic-gate 	switch (af) {
657c478bd9Sstevel@tonic-gate 	case AF_INET:
667c478bd9Sstevel@tonic-gate 		return (inet_cidr_ntop_ipv4(src, bits, dst, size));
677c478bd9Sstevel@tonic-gate 	case AF_INET6:
687c478bd9Sstevel@tonic-gate 		return (inet_cidr_ntop_ipv6(src, bits, dst, size));
697c478bd9Sstevel@tonic-gate 	default:
707c478bd9Sstevel@tonic-gate 		errno = EAFNOSUPPORT;
717c478bd9Sstevel@tonic-gate 		return (NULL);
727c478bd9Sstevel@tonic-gate 	}
737c478bd9Sstevel@tonic-gate }
747c478bd9Sstevel@tonic-gate 
757c478bd9Sstevel@tonic-gate static int
decoct(const u_char * src,int bytes,char * dst,size_t size)767c478bd9Sstevel@tonic-gate decoct(const u_char *src, int bytes, char *dst, size_t size) {
777c478bd9Sstevel@tonic-gate 	char *odst = dst;
787c478bd9Sstevel@tonic-gate 	char *t;
797c478bd9Sstevel@tonic-gate 	int b;
807c478bd9Sstevel@tonic-gate 
817c478bd9Sstevel@tonic-gate 	for (b = 1; b <= bytes; b++) {
827c478bd9Sstevel@tonic-gate 		if (size < sizeof "255.")
837c478bd9Sstevel@tonic-gate 			return (0);
847c478bd9Sstevel@tonic-gate 		t = dst;
857c478bd9Sstevel@tonic-gate 		dst += SPRINTF((dst, "%u", *src++));
867c478bd9Sstevel@tonic-gate 		if (b != bytes) {
877c478bd9Sstevel@tonic-gate 			*dst++ = '.';
887c478bd9Sstevel@tonic-gate 			*dst = '\0';
897c478bd9Sstevel@tonic-gate 		}
907c478bd9Sstevel@tonic-gate 		size -= (size_t)(dst - t);
917c478bd9Sstevel@tonic-gate 	}
927c478bd9Sstevel@tonic-gate 	return (dst - odst);
937c478bd9Sstevel@tonic-gate }
947c478bd9Sstevel@tonic-gate 
959525b14bSRao Shoaib /*%
967c478bd9Sstevel@tonic-gate  * static char *
977c478bd9Sstevel@tonic-gate  * inet_cidr_ntop_ipv4(src, bits, dst, size)
987c478bd9Sstevel@tonic-gate  *	convert IPv4 network address from network to presentation format.
997c478bd9Sstevel@tonic-gate  *	"src"'s size is determined from its "af".
1007c478bd9Sstevel@tonic-gate  * return:
1017c478bd9Sstevel@tonic-gate  *	pointer to dst, or NULL if an error occurred (check errno).
1027c478bd9Sstevel@tonic-gate  * note:
1037c478bd9Sstevel@tonic-gate  *	network byte order assumed.  this means 192.5.5.240/28 has
1047c478bd9Sstevel@tonic-gate  *	0b11110000 in its fourth octet.
1057c478bd9Sstevel@tonic-gate  * author:
1067c478bd9Sstevel@tonic-gate  *	Paul Vixie (ISC), October 1998
1077c478bd9Sstevel@tonic-gate  */
1087c478bd9Sstevel@tonic-gate static char *
inet_cidr_ntop_ipv4(const u_char * src,int bits,char * dst,size_t size)1097c478bd9Sstevel@tonic-gate inet_cidr_ntop_ipv4(const u_char *src, int bits, char *dst, size_t size) {
1107c478bd9Sstevel@tonic-gate 	char *odst = dst;
1117c478bd9Sstevel@tonic-gate 	size_t len = 4;
1127c478bd9Sstevel@tonic-gate 	size_t b;
1137c478bd9Sstevel@tonic-gate 	size_t bytes;
1147c478bd9Sstevel@tonic-gate 
1157c478bd9Sstevel@tonic-gate 	if ((bits < -1) || (bits > 32)) {
1167c478bd9Sstevel@tonic-gate 		errno = EINVAL;
1177c478bd9Sstevel@tonic-gate 		return (NULL);
1187c478bd9Sstevel@tonic-gate 	}
1197c478bd9Sstevel@tonic-gate 
1207c478bd9Sstevel@tonic-gate 	/* Find number of significant bytes in address. */
1217c478bd9Sstevel@tonic-gate 	if (bits == -1)
1227c478bd9Sstevel@tonic-gate 		len = 4;
1237c478bd9Sstevel@tonic-gate 	else
1249525b14bSRao Shoaib 		for (len = 1, b = 1 ; b < 4U; b++)
1257c478bd9Sstevel@tonic-gate 			if (*(src + b))
1267c478bd9Sstevel@tonic-gate 				len = b + 1;
1277c478bd9Sstevel@tonic-gate 
1287c478bd9Sstevel@tonic-gate 	/* Format whole octets plus nonzero trailing octets. */
1297c478bd9Sstevel@tonic-gate 	bytes = (((bits <= 0) ? 1 : bits) + 7) / 8;
1307c478bd9Sstevel@tonic-gate 	if (len > bytes)
1317c478bd9Sstevel@tonic-gate 		bytes = len;
1327c478bd9Sstevel@tonic-gate 	b = decoct(src, bytes, dst, size);
1339525b14bSRao Shoaib 	if (b == 0U)
1347c478bd9Sstevel@tonic-gate 		goto emsgsize;
1357c478bd9Sstevel@tonic-gate 	dst += b;
1367c478bd9Sstevel@tonic-gate 	size -= b;
1377c478bd9Sstevel@tonic-gate 
1387c478bd9Sstevel@tonic-gate 	if (bits != -1) {
1397c478bd9Sstevel@tonic-gate 		/* Format CIDR /width. */
1407c478bd9Sstevel@tonic-gate 		if (size < sizeof "/32")
1417c478bd9Sstevel@tonic-gate 			goto emsgsize;
1427c478bd9Sstevel@tonic-gate 		dst += SPRINTF((dst, "/%u", bits));
1437c478bd9Sstevel@tonic-gate 	}
1447c478bd9Sstevel@tonic-gate 
1457c478bd9Sstevel@tonic-gate 	return (odst);
1467c478bd9Sstevel@tonic-gate 
1477c478bd9Sstevel@tonic-gate  emsgsize:
1487c478bd9Sstevel@tonic-gate 	errno = EMSGSIZE;
1497c478bd9Sstevel@tonic-gate 	return (NULL);
1507c478bd9Sstevel@tonic-gate }
151*55fea89dSDan Cross 
1527c478bd9Sstevel@tonic-gate static char *
inet_cidr_ntop_ipv6(const u_char * src,int bits,char * dst,size_t size)1537c478bd9Sstevel@tonic-gate inet_cidr_ntop_ipv6(const u_char *src, int bits, char *dst, size_t size) {
1547c478bd9Sstevel@tonic-gate 	/*
1557c478bd9Sstevel@tonic-gate 	 * Note that int32_t and int16_t need only be "at least" large enough
1567c478bd9Sstevel@tonic-gate 	 * to contain a value of the specified size.  On some systems, like
1577c478bd9Sstevel@tonic-gate 	 * Crays, there is no such thing as an integer variable with 16 bits.
1587c478bd9Sstevel@tonic-gate 	 * Keep this in mind if you think this function should have been coded
1597c478bd9Sstevel@tonic-gate 	 * to use pointer overlays.  All the world's not a VAX.
1607c478bd9Sstevel@tonic-gate 	 */
1617c478bd9Sstevel@tonic-gate 	char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255/128"];
1627c478bd9Sstevel@tonic-gate 	char *tp;
1637c478bd9Sstevel@tonic-gate 	struct { int base, len; } best, cur;
1647c478bd9Sstevel@tonic-gate 	u_int words[NS_IN6ADDRSZ / NS_INT16SZ];
1657c478bd9Sstevel@tonic-gate 	int i;
1667c478bd9Sstevel@tonic-gate 
1677c478bd9Sstevel@tonic-gate 	if ((bits < -1) || (bits > 128)) {
1687c478bd9Sstevel@tonic-gate 		errno = EINVAL;
1697c478bd9Sstevel@tonic-gate 		return (NULL);
1707c478bd9Sstevel@tonic-gate 	}
1717c478bd9Sstevel@tonic-gate 
1727c478bd9Sstevel@tonic-gate 	/*
1737c478bd9Sstevel@tonic-gate 	 * Preprocess:
1747c478bd9Sstevel@tonic-gate 	 *	Copy the input (bytewise) array into a wordwise array.
1757c478bd9Sstevel@tonic-gate 	 *	Find the longest run of 0x00's in src[] for :: shorthanding.
1767c478bd9Sstevel@tonic-gate 	 */
1777c478bd9Sstevel@tonic-gate 	memset(words, '\0', sizeof words);
1787c478bd9Sstevel@tonic-gate 	for (i = 0; i < NS_IN6ADDRSZ; i++)
1797c478bd9Sstevel@tonic-gate 		words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));
1807c478bd9Sstevel@tonic-gate 	best.base = -1;
1819525b14bSRao Shoaib 	best.len = 0;
1827c478bd9Sstevel@tonic-gate 	cur.base = -1;
1839525b14bSRao Shoaib 	cur.len = 0;
1847c478bd9Sstevel@tonic-gate 	for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) {
1857c478bd9Sstevel@tonic-gate 		if (words[i] == 0) {
1867c478bd9Sstevel@tonic-gate 			if (cur.base == -1)
1877c478bd9Sstevel@tonic-gate 				cur.base = i, cur.len = 1;
1887c478bd9Sstevel@tonic-gate 			else
1897c478bd9Sstevel@tonic-gate 				cur.len++;
1907c478bd9Sstevel@tonic-gate 		} else {
1917c478bd9Sstevel@tonic-gate 			if (cur.base != -1) {
1927c478bd9Sstevel@tonic-gate 				if (best.base == -1 || cur.len > best.len)
1937c478bd9Sstevel@tonic-gate 					best = cur;
1947c478bd9Sstevel@tonic-gate 				cur.base = -1;
1957c478bd9Sstevel@tonic-gate 			}
1967c478bd9Sstevel@tonic-gate 		}
1977c478bd9Sstevel@tonic-gate 	}
1987c478bd9Sstevel@tonic-gate 	if (cur.base != -1) {
1997c478bd9Sstevel@tonic-gate 		if (best.base == -1 || cur.len > best.len)
2007c478bd9Sstevel@tonic-gate 			best = cur;
2017c478bd9Sstevel@tonic-gate 	}
2027c478bd9Sstevel@tonic-gate 	if (best.base != -1 && best.len < 2)
2037c478bd9Sstevel@tonic-gate 		best.base = -1;
2047c478bd9Sstevel@tonic-gate 
2057c478bd9Sstevel@tonic-gate 	/*
2067c478bd9Sstevel@tonic-gate 	 * Format the result.
2077c478bd9Sstevel@tonic-gate 	 */
2087c478bd9Sstevel@tonic-gate 	tp = tmp;
2097c478bd9Sstevel@tonic-gate 	for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) {
2107c478bd9Sstevel@tonic-gate 		/* Are we inside the best run of 0x00's? */
2117c478bd9Sstevel@tonic-gate 		if (best.base != -1 && i >= best.base &&
2127c478bd9Sstevel@tonic-gate 		    i < (best.base + best.len)) {
2137c478bd9Sstevel@tonic-gate 			if (i == best.base)
2147c478bd9Sstevel@tonic-gate 				*tp++ = ':';
2157c478bd9Sstevel@tonic-gate 			continue;
2167c478bd9Sstevel@tonic-gate 		}
2177c478bd9Sstevel@tonic-gate 		/* Are we following an initial run of 0x00s or any real hex? */
2187c478bd9Sstevel@tonic-gate 		if (i != 0)
2197c478bd9Sstevel@tonic-gate 			*tp++ = ':';
2207c478bd9Sstevel@tonic-gate 		/* Is this address an encapsulated IPv4? */
2217c478bd9Sstevel@tonic-gate 		if (i == 6 && best.base == 0 && (best.len == 6 ||
2227c478bd9Sstevel@tonic-gate 		    (best.len == 7 && words[7] != 0x0001) ||
2237c478bd9Sstevel@tonic-gate 		    (best.len == 5 && words[5] == 0xffff))) {
2247c478bd9Sstevel@tonic-gate 			int n;
2257c478bd9Sstevel@tonic-gate 
2267c478bd9Sstevel@tonic-gate 			if (src[15] || bits == -1 || bits > 120)
2277c478bd9Sstevel@tonic-gate 				n = 4;
2287c478bd9Sstevel@tonic-gate 			else if (src[14] || bits > 112)
2297c478bd9Sstevel@tonic-gate 				n = 3;
2307c478bd9Sstevel@tonic-gate 			else
2317c478bd9Sstevel@tonic-gate 				n = 2;
2327c478bd9Sstevel@tonic-gate 			n = decoct(src+12, n, tp, sizeof tmp - (tp - tmp));
2337c478bd9Sstevel@tonic-gate 			if (n == 0) {
2347c478bd9Sstevel@tonic-gate 				errno = EMSGSIZE;
2357c478bd9Sstevel@tonic-gate 				return (NULL);
2367c478bd9Sstevel@tonic-gate 			}
2377c478bd9Sstevel@tonic-gate 			tp += strlen(tp);
2387c478bd9Sstevel@tonic-gate 			break;
2397c478bd9Sstevel@tonic-gate 		}
2407c478bd9Sstevel@tonic-gate 		tp += SPRINTF((tp, "%x", words[i]));
2417c478bd9Sstevel@tonic-gate 	}
2427c478bd9Sstevel@tonic-gate 
2437c478bd9Sstevel@tonic-gate 	/* Was it a trailing run of 0x00's? */
244*55fea89dSDan Cross 	if (best.base != -1 && (best.base + best.len) ==
2457c478bd9Sstevel@tonic-gate 	    (NS_IN6ADDRSZ / NS_INT16SZ))
2467c478bd9Sstevel@tonic-gate 		*tp++ = ':';
2477c478bd9Sstevel@tonic-gate 	*tp = '\0';
2487c478bd9Sstevel@tonic-gate 
2497c478bd9Sstevel@tonic-gate 	if (bits != -1)
2507c478bd9Sstevel@tonic-gate 		tp += SPRINTF((tp, "/%u", bits));
2517c478bd9Sstevel@tonic-gate 
2527c478bd9Sstevel@tonic-gate 	/*
2537c478bd9Sstevel@tonic-gate 	 * Check for overflow, copy, and we're done.
2547c478bd9Sstevel@tonic-gate 	 */
2557c478bd9Sstevel@tonic-gate 	if ((size_t)(tp - tmp) > size) {
2567c478bd9Sstevel@tonic-gate 		errno = EMSGSIZE;
2577c478bd9Sstevel@tonic-gate 		return (NULL);
2587c478bd9Sstevel@tonic-gate 	}
2597c478bd9Sstevel@tonic-gate 	strcpy(dst, tmp);
2607c478bd9Sstevel@tonic-gate 	return (dst);
2617c478bd9Sstevel@tonic-gate }
2629525b14bSRao Shoaib 
2639525b14bSRao Shoaib /*! \file */
264