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/* $OpenBSD: inet_net_ntop.c,v 1.9 2019/07/03 03:24:04 deraadt Exp $ */
/*
* Copyright (c) 2012 by Gilles Chehade <gilles@openbsd.org>
* 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.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
static char *inet_net_ntop_ipv4(const u_char *, int, char *, size_t);
static char *inet_net_ntop_ipv6(const u_char *, int, char *, size_t);
/*
* char *
* inet_net_ntop(af, src, bits, dst, size)
* convert network number from network to presentation format.
* generates CIDR style result always.
* return:
* pointer to dst, or NULL if an error occurred (check errno).
* author:
* Paul Vixie (ISC), July 1996
*/
char *
inet_net_ntop(int af, const void *src, int bits, char *dst, size_t size)
{
switch (af) {
case AF_INET:
return (inet_net_ntop_ipv4(src, bits, dst, size));
case AF_INET6:
return (inet_net_ntop_ipv6(src, bits, dst, size));
default:
errno = EAFNOSUPPORT;
return (NULL);
}
}
/*
* static char *
* inet_net_ntop_ipv4(src, bits, dst, size)
* convert IPv4 network number from network to presentation format.
* generates CIDR style result always.
* return:
* pointer to dst, or NULL if an error occurred (check errno).
* note:
* network byte order assumed. this means 192.5.5.240/28 has
* 0x11110000 in its fourth octet.
* author:
* Paul Vixie (ISC), July 1996
*/
static char *
inet_net_ntop_ipv4(const u_char *src, int bits, char *dst, size_t size)
{
char *odst = dst;
u_int m;
int b;
char *ep;
int advance;
ep = dst + size;
if (ep <= dst)
goto emsgsize;
if (bits < 0 || bits > 32) {
errno = EINVAL;
return (NULL);
}
if (bits == 0) {
if (ep - dst < sizeof "0")
goto emsgsize;
*dst++ = '0';
*dst = '\0';
}
/* Format whole octets. */
for (b = bits / 8; b > 0; b--) {
if (ep - dst < sizeof "255.")
goto emsgsize;
advance = snprintf(dst, ep - dst, "%u", *src++);
if (advance <= 0 || advance >= ep - dst)
goto emsgsize;
dst += advance;
if (b > 1) {
if (dst + 1 >= ep)
goto emsgsize;
*dst++ = '.';
*dst = '\0';
}
}
/* Format partial octet. */
b = bits % 8;
if (b > 0) {
if (ep - dst < sizeof ".255")
goto emsgsize;
if (dst != odst)
*dst++ = '.';
m = ((1 << b) - 1) << (8 - b);
advance = snprintf(dst, ep - dst, "%u", *src & m);
if (advance <= 0 || advance >= ep - dst)
goto emsgsize;
dst += advance;
}
/* Format CIDR /width. */
if (ep - dst < sizeof "/32")
goto emsgsize;
advance = snprintf(dst, ep - dst, "/%u", bits);
if (advance <= 0 || advance >= ep - dst)
goto emsgsize;
dst += advance;
return (odst);
emsgsize:
errno = EMSGSIZE;
return (NULL);
}
static char *
inet_net_ntop_ipv6(const u_char *src, int bits, char *dst, size_t size)
{
int ret;
char buf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255:255:255:255/128")];
if (bits < 0 || bits > 128) {
errno = EINVAL;
return (NULL);
}
if (inet_ntop(AF_INET6, src, buf, size) == NULL)
return (NULL);
ret = snprintf(dst, size, "%s/%d", buf, bits);
if (ret < 0 || ret >= size) {
errno = EMSGSIZE;
return (NULL);
}
return (dst);
}
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