132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
/* $NetBSD: inet_cidr_ntop.c,v 1.1.1.1 1999/11/20 18:54:07 veego Exp $ */
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/*
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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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* 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 8.4 1999/10/07 20:44:02 vixie Exp";
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#endif
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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_cidr_ntop_ipv4 __P((const u_char *src, int bits,
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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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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_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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char *t;
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size_t len = 4;
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int b, tb;
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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 = 3;
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else
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for (len = 0,b = 1 ; b < 4; b++)
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if (*(src + b))
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len = b;
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/* Format whole octets plus nonzero trailing octets. */
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tb = (bits <= 0) ? 1 : (bits - 1);
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for (b = 0; b <= (tb / 8) || (b <= len); 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 <= (tb / 8) || (b + 1 <= len)) {
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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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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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