#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "$Id: inet_net_ntop.c,v 1.3.18.2 2006/06/20 02:51:32 marka Exp $";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/inet/inet_net_ntop.c,v 1.4 2007/06/03 17:20:26 ume Exp $");
#include "port_before.h"
#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>
#include "port_after.h"
#ifdef SPRINTF_CHAR
# define SPRINTF(x) strlen(sprintfx)
#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);
static char * inet_net_ntop_ipv6(const u_char *src, int bits, char *dst,
size_t size);
char *
inet_net_ntop(af, src, bits, dst, size)
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)
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) {
errno = EINVAL;
return (NULL);
}
if (bits == 0) {
if (size < sizeof "0")
goto emsgsize;
*dst++ = '0';
size--;
*dst = '\0';
}
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);
}
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);
}
if (size <= sizeof "/32")
goto emsgsize;
dst += SPRINTF((dst, "/%u", bits));
return (odst);
emsgsize:
errno = EMSGSIZE;
return (NULL);
}
static char *
inet_net_ntop_ipv6(const u_char *src, int bits, char *dst, size_t size) {
u_int m;
int b;
int p;
int zero_s, zero_l, tmp_zero_s, tmp_zero_l;
int i;
int is_ipv4 = 0;
unsigned char inbuf[16];
char outbuf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255/128")];
char *cp;
int words;
u_char *s;
if (bits < 0 || bits > 128) {
errno = EINVAL;
return (NULL);
}
cp = outbuf;
if (bits == 0) {
*cp++ = ':';
*cp++ = ':';
*cp = '\0';
} else {
p = (bits + 7) / 8;
memcpy(inbuf, src, p);
memset(inbuf + p, 0, 16 - p);
b = bits % 8;
if (b != 0) {
m = ~0 << (8 - b);
inbuf[p-1] &= m;
}
s = inbuf;
words = (bits + 15) / 16;
if (words == 1)
words = 2;
zero_s = zero_l = tmp_zero_s = tmp_zero_l = 0;
for (i = 0; i < (words * 2); i += 2) {
if ((s[i] | s[i+1]) == 0) {
if (tmp_zero_l == 0)
tmp_zero_s = i / 2;
tmp_zero_l++;
} else {
if (tmp_zero_l && zero_l < tmp_zero_l) {
zero_s = tmp_zero_s;
zero_l = tmp_zero_l;
tmp_zero_l = 0;
}
}
}
if (tmp_zero_l && zero_l < tmp_zero_l) {
zero_s = tmp_zero_s;
zero_l = tmp_zero_l;
}
if (zero_l != words && zero_s == 0 && ((zero_l == 6) ||
((zero_l == 5 && s[10] == 0xff && s[11] == 0xff) ||
((zero_l == 7 && s[14] != 0 && s[15] != 1)))))
is_ipv4 = 1;
for (p = 0; p < words; p++) {
if (zero_l != 0 && p >= zero_s && p < zero_s + zero_l) {
if (p == zero_s)
*cp++ = ':';
if (p == words - 1)
*cp++ = ':';
s++;
s++;
continue;
}
if (is_ipv4 && p > 5 ) {
*cp++ = (p == 6) ? ':' : '.';
cp += SPRINTF((cp, "%u", *s++));
if (p != 7 || bits > 120) {
*cp++ = '.';
cp += SPRINTF((cp, "%u", *s++));
}
} else {
if (cp != outbuf)
*cp++ = ':';
cp += SPRINTF((cp, "%x", *s * 256 + s[1]));
s += 2;
}
}
}
sprintf(cp, "/%u", bits);
if (strlen(outbuf) + 1 > size)
goto emsgsize;
strcpy(dst, outbuf);
return (dst);
emsgsize:
errno = EMSGSIZE;
return (NULL);
}
#undef inet_net_ntop
__weak_reference(__inet_net_ntop, inet_net_ntop);