mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-27 05:00:15 +00:00
128 lines
3.1 KiB
C
128 lines
3.1 KiB
C
/*
|
|
* Copyright (c) 1996,1999 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>
|
|
|
|
#ifdef SPRINTF_CHAR
|
|
# define SPRINTF(x) strlen(sprintf/**/x)
|
|
#else
|
|
# define SPRINTF(x) ((size_t)sprintf x)
|
|
#endif
|
|
|
|
static char * inet_net_ntop_ipv4 (const u_char *src, int bits,
|
|
char *dst, size_t size) __THROW;
|
|
|
|
/*
|
|
* 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));
|
|
default:
|
|
__set_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
|
|
* 0b11110000 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;
|
|
char *t;
|
|
u_int m;
|
|
int b;
|
|
|
|
if (bits < 0 || bits > 32) {
|
|
__set_errno (EINVAL);
|
|
return (NULL);
|
|
}
|
|
if (bits == 0) {
|
|
if (size < sizeof "0")
|
|
goto emsgsize;
|
|
*dst++ = '0';
|
|
size--;
|
|
*dst = '\0';
|
|
}
|
|
|
|
/* Format whole octets. */
|
|
for (b = bits / 8; b > 0; b--) {
|
|
if (size < sizeof "255.")
|
|
goto emsgsize;
|
|
t = dst;
|
|
dst += SPRINTF((dst, "%u", *src++));
|
|
if (b > 1) {
|
|
*dst++ = '.';
|
|
*dst = '\0';
|
|
}
|
|
size -= (size_t)(dst - t);
|
|
}
|
|
|
|
/* Format partial octet. */
|
|
b = bits % 8;
|
|
if (b > 0) {
|
|
if (size < sizeof ".255")
|
|
goto emsgsize;
|
|
t = dst;
|
|
if (dst != odst)
|
|
*dst++ = '.';
|
|
m = ((1 << b) - 1) << (8 - b);
|
|
dst += SPRINTF((dst, "%u", *src & m));
|
|
size -= (size_t)(dst - t);
|
|
}
|
|
|
|
/* Format CIDR /width. */
|
|
if (size < sizeof "/32")
|
|
goto emsgsize;
|
|
dst += SPRINTF((dst, "/%u", bits));
|
|
return (odst);
|
|
|
|
emsgsize:
|
|
__set_errno (EMSGSIZE);
|
|
return (NULL);
|
|
}
|