268 lines
6.5 KiB
C
268 lines
6.5 KiB
C
/*-
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
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* Copyright (c) 1998,1999 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static const char rcsid[] = "$Id: inet_cidr_ntop.c,v 1.7 2006/10/11 02:18:18 marka Exp $";
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "port_before.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "port_after.h"
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#ifdef SPRINTF_CHAR
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# define SPRINTF(x) strlen(sprintf/**/x)
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#else
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# define SPRINTF(x) ((size_t)sprintf x)
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#endif
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static char *
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inet_cidr_ntop_ipv4(const u_char *src, int bits, char *dst, size_t size);
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static char *
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inet_cidr_ntop_ipv6(const u_char *src, int bits, char *dst, size_t size);
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/*%
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* char *
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* inet_cidr_ntop(af, src, bits, dst, size)
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* convert network address from network to presentation format.
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* "src"'s size is determined from its "af".
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* return:
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* pointer to dst, or NULL if an error occurred (check errno).
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* note:
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* 192.5.5.1/28 has a nonzero host part, which means it isn't a network
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* as called for by inet_net_ntop() but it can be a host address with
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* an included netmask.
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* author:
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* Paul Vixie (ISC), October 1998
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*/
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char *
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inet_cidr_ntop(int af, const void *src, int bits, char *dst, size_t size) {
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switch (af) {
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case AF_INET:
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return (inet_cidr_ntop_ipv4(src, bits, dst, size));
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case AF_INET6:
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return (inet_cidr_ntop_ipv6(src, bits, dst, size));
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default:
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errno = EAFNOSUPPORT;
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return (NULL);
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}
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}
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static int
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decoct(const u_char *src, int bytes, char *dst, size_t size) {
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char *odst = dst;
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char *t;
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int b;
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for (b = 1; b <= bytes; b++) {
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if (size < sizeof "255.")
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return (0);
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t = dst;
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dst += SPRINTF((dst, "%u", *src++));
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if (b != bytes) {
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*dst++ = '.';
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*dst = '\0';
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}
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size -= (size_t)(dst - t);
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}
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return (dst - odst);
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}
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/*%
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* static char *
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* inet_cidr_ntop_ipv4(src, bits, dst, size)
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* convert IPv4 network address from network to presentation format.
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* "src"'s size is determined from its "af".
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* return:
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* pointer to dst, or NULL if an error occurred (check errno).
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* note:
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* network byte order assumed. this means 192.5.5.240/28 has
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* 0b11110000 in its fourth octet.
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* author:
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* Paul Vixie (ISC), October 1998
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*/
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static char *
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inet_cidr_ntop_ipv4(const u_char *src, int bits, char *dst, size_t size) {
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char *odst = dst;
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size_t len = 4;
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size_t b;
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size_t bytes;
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if ((bits < -1) || (bits > 32)) {
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errno = EINVAL;
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return (NULL);
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}
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/* Find number of significant bytes in address. */
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if (bits == -1)
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len = 4;
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else
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for (len = 1, b = 1 ; b < 4U; b++)
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if (*(src + b))
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len = b + 1;
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/* Format whole octets plus nonzero trailing octets. */
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bytes = (((bits <= 0) ? 1 : bits) + 7) / 8;
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if (len > bytes)
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bytes = len;
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b = decoct(src, bytes, dst, size);
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if (b == 0U)
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goto emsgsize;
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dst += b;
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size -= b;
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if (bits != -1) {
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/* Format CIDR /width. */
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if (size < sizeof "/32")
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goto emsgsize;
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dst += SPRINTF((dst, "/%u", bits));
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}
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return (odst);
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emsgsize:
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errno = EMSGSIZE;
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return (NULL);
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}
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static char *
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inet_cidr_ntop_ipv6(const u_char *src, int bits, char *dst, size_t size) {
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/*
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* Note that int32_t and int16_t need only be "at least" large enough
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* to contain a value of the specified size. On some systems, like
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* Crays, there is no such thing as an integer variable with 16 bits.
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* Keep this in mind if you think this function should have been coded
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* to use pointer overlays. All the world's not a VAX.
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*/
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char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255/128"];
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char *tp;
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struct { int base, len; } best, cur;
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u_int words[NS_IN6ADDRSZ / NS_INT16SZ];
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int i;
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if ((bits < -1) || (bits > 128)) {
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errno = EINVAL;
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return (NULL);
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}
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/*
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* Preprocess:
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* Copy the input (bytewise) array into a wordwise array.
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* Find the longest run of 0x00's in src[] for :: shorthanding.
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*/
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memset(words, '\0', sizeof words);
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for (i = 0; i < NS_IN6ADDRSZ; i++)
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words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));
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best.base = -1;
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best.len = 0;
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cur.base = -1;
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cur.len = 0;
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for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) {
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if (words[i] == 0) {
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if (cur.base == -1)
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cur.base = i, cur.len = 1;
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else
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cur.len++;
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} else {
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if (cur.base != -1) {
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if (best.base == -1 || cur.len > best.len)
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best = cur;
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cur.base = -1;
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}
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}
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}
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if (cur.base != -1) {
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if (best.base == -1 || cur.len > best.len)
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best = cur;
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}
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if (best.base != -1 && best.len < 2)
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best.base = -1;
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/*
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* Format the result.
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*/
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tp = tmp;
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for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) {
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/* Are we inside the best run of 0x00's? */
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if (best.base != -1 && i >= best.base &&
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i < (best.base + best.len)) {
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if (i == best.base)
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*tp++ = ':';
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continue;
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}
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/* Are we following an initial run of 0x00s or any real hex? */
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if (i != 0)
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*tp++ = ':';
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/* Is this address an encapsulated IPv4? */
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if (i == 6 && best.base == 0 && (best.len == 6 ||
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(best.len == 7 && words[7] != 0x0001) ||
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(best.len == 5 && words[5] == 0xffff))) {
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int n;
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if (src[15] || bits == -1 || bits > 120)
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n = 4;
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else if (src[14] || bits > 112)
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n = 3;
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else
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n = 2;
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n = decoct(src+12, n, tp, sizeof tmp - (tp - tmp));
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if (n == 0) {
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errno = EMSGSIZE;
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return (NULL);
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}
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tp += strlen(tp);
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break;
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}
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tp += SPRINTF((tp, "%x", words[i]));
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}
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/* Was it a trailing run of 0x00's? */
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if (best.base != -1 && (best.base + best.len) ==
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(NS_IN6ADDRSZ / NS_INT16SZ))
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*tp++ = ':';
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*tp = '\0';
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if (bits != -1)
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tp += SPRINTF((tp, "/%u", bits));
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/*
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* Check for overflow, copy, and we're done.
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*/
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if ((size_t)(tp - tmp) > size) {
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errno = EMSGSIZE;
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return (NULL);
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}
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strcpy(dst, tmp);
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return (dst);
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}
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/*! \file */
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