289 lines
6.5 KiB
C
289 lines
6.5 KiB
C
/*
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* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
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* Copyright (c) 1996,1999 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_net_ntop.c,v 1.3.18.2 2006/06/20 02:51:32 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/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 * inet_net_ntop_ipv4(const u_char *src, int bits, char *dst,
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size_t size);
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static char * inet_net_ntop_ipv6(const u_char *src, int bits, char *dst,
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size_t size);
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/*%
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* char *
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* inet_net_ntop(af, src, bits, dst, size)
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* convert network number from network to presentation format.
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* generates CIDR style result always.
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* return:
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* pointer to dst, or NULL if an error occurred (check errno).
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* author:
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* Paul Vixie (ISC), July 1996
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*/
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char *
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inet_net_ntop(af, src, bits, dst, size)
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int af;
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const void *src;
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int bits;
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char *dst;
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size_t size;
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{
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switch (af) {
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case AF_INET:
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return (inet_net_ntop_ipv4(src, bits, dst, size));
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case AF_INET6:
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return (inet_net_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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/*%
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* static char *
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* inet_net_ntop_ipv4(src, bits, dst, size)
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* convert IPv4 network number from network to presentation format.
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* generates CIDR style result always.
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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), July 1996
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*/
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static char *
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inet_net_ntop_ipv4(src, bits, dst, size)
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const u_char *src;
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int bits;
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char *dst;
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size_t size;
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{
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char *odst = dst;
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char *t;
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u_int m;
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int b;
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if (bits < 0 || bits > 32) {
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errno = EINVAL;
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return (NULL);
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}
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if (bits == 0) {
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if (size < sizeof "0")
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goto emsgsize;
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*dst++ = '0';
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size--;
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*dst = '\0';
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}
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/* Format whole octets. */
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for (b = bits / 8; b > 0; b--) {
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if (size <= sizeof "255.")
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goto emsgsize;
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t = dst;
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dst += SPRINTF((dst, "%u", *src++));
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if (b > 1) {
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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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/* Format partial octet. */
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b = bits % 8;
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if (b > 0) {
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if (size <= sizeof ".255")
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goto emsgsize;
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t = dst;
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if (dst != odst)
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*dst++ = '.';
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m = ((1 << b) - 1) << (8 - b);
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dst += SPRINTF((dst, "%u", *src & m));
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size -= (size_t)(dst - t);
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}
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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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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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/*%
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* static char *
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* inet_net_ntop_ipv6(src, bits, fakebits, dst, size)
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* convert IPv6 network number from network to presentation format.
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* generates CIDR style result always. Picks the shortest representation
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* unless the IP is really IPv4.
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* always prints specified number of bits (bits).
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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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* Vadim Kogan (UCB), June 2001
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* Original version (IPv4) by Paul Vixie (ISC), July 1996
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*/
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static char *
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inet_net_ntop_ipv6(const u_char *src, int bits, char *dst, size_t size) {
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u_int m;
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int b;
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int p;
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int zero_s, zero_l, tmp_zero_s, tmp_zero_l;
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int i;
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int is_ipv4 = 0;
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unsigned char inbuf[16];
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char outbuf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255/128")];
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char *cp;
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int words;
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u_char *s;
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if (bits < 0 || bits > 128) {
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errno = EINVAL;
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return (NULL);
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}
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cp = outbuf;
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if (bits == 0) {
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*cp++ = ':';
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*cp++ = ':';
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*cp = '\0';
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} else {
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/* Copy src to private buffer. Zero host part. */
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p = (bits + 7) / 8;
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memcpy(inbuf, src, p);
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memset(inbuf + p, 0, 16 - p);
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b = bits % 8;
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if (b != 0) {
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m = ~0 << (8 - b);
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inbuf[p-1] &= m;
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}
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s = inbuf;
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/* how many words need to be displayed in output */
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words = (bits + 15) / 16;
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if (words == 1)
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words = 2;
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/* Find the longest substring of zero's */
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zero_s = zero_l = tmp_zero_s = tmp_zero_l = 0;
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for (i = 0; i < (words * 2); i += 2) {
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if ((s[i] | s[i+1]) == 0) {
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if (tmp_zero_l == 0)
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tmp_zero_s = i / 2;
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tmp_zero_l++;
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} else {
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if (tmp_zero_l && zero_l < tmp_zero_l) {
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zero_s = tmp_zero_s;
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zero_l = tmp_zero_l;
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tmp_zero_l = 0;
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}
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}
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}
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if (tmp_zero_l && zero_l < tmp_zero_l) {
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zero_s = tmp_zero_s;
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zero_l = tmp_zero_l;
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}
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if (zero_l != words && zero_s == 0 && ((zero_l == 6) ||
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((zero_l == 5 && s[10] == 0xff && s[11] == 0xff) ||
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((zero_l == 7 && s[14] != 0 && s[15] != 1)))))
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is_ipv4 = 1;
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/* Format whole words. */
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for (p = 0; p < words; p++) {
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if (zero_l != 0 && p >= zero_s && p < zero_s + zero_l) {
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/* Time to skip some zeros */
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if (p == zero_s)
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*cp++ = ':';
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if (p == words - 1)
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*cp++ = ':';
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s++;
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s++;
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continue;
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}
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if (is_ipv4 && p > 5 ) {
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*cp++ = (p == 6) ? ':' : '.';
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cp += SPRINTF((cp, "%u", *s++));
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/* we can potentially drop the last octet */
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if (p != 7 || bits > 120) {
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*cp++ = '.';
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cp += SPRINTF((cp, "%u", *s++));
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}
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} else {
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if (cp != outbuf)
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*cp++ = ':';
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cp += SPRINTF((cp, "%x", *s * 256 + s[1]));
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s += 2;
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}
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}
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}
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/* Format CIDR /width. */
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sprintf(cp, "/%u", bits);
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if (strlen(outbuf) + 1 > size)
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goto emsgsize;
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strcpy(dst, outbuf);
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return (dst);
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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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/*
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* Weak aliases for applications that use certain private entry points,
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* and fail to include <arpa/inet.h>.
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*/
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#undef inet_net_ntop
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__weak_reference(__inet_net_ntop, inet_net_ntop);
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/*! \file */
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