#include "apr_private.h"
#include "apr_arch_networkio.h"
#include "apr_strings.h"
#if APR_HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if APR_HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if APR_HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if APR_HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#include <string.h>
#if APR_HAVE_ERRNO_H
#include <errno.h>
#endif
#include <stdio.h>
#ifndef IN6ADDRSZ
#define IN6ADDRSZ 16
#endif
#ifndef INT16SZ
#define INT16SZ sizeof(apr_int16_t)
#endif
#ifndef __P
#define __P(x) x
#endif
#if !defined(EAFNOSUPPORT) && defined(WSAEAFNOSUPPORT)
#define EAFNOSUPPORT WSAEAFNOSUPPORT
#endif
static const char *inet_ntop4 __P((const unsigned char *src, char *dst, apr_size_t size));
#if APR_HAVE_IPV6
static const char *inet_ntop6 __P((const unsigned char *src, char *dst, apr_size_t size));
#endif
const char *
apr_inet_ntop(int af, const void *src, char *dst, apr_size_t size)
{
switch (af) {
case AF_INET:
return (inet_ntop4(src, dst, size));
#if APR_HAVE_IPV6
case AF_INET6:
return (inet_ntop6(src, dst, size));
#endif
default:
errno = EAFNOSUPPORT;
return (NULL);
}
}
static const char *
inet_ntop4(const unsigned char *src, char *dst, apr_size_t size)
{
const apr_size_t MIN_SIZE = 16;
int n = 0;
char *next = dst;
if (size < MIN_SIZE) {
errno = ENOSPC;
return NULL;
}
do {
unsigned char u = *src++;
if (u > 99) {
*next++ = '0' + u/100;
u %= 100;
*next++ = '0' + u/10;
u %= 10;
}
else if (u > 9) {
*next++ = '0' + u/10;
u %= 10;
}
*next++ = '0' + u;
*next++ = '.';
n++;
} while (n < 4);
*--next = 0;
return dst;
}
#if APR_HAVE_IPV6
static const char *
inet_ntop6(const unsigned char *src, char *dst, apr_size_t size)
{
char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp;
struct { int base, len; } best = {-1, 0}, cur = {-1, 0};
unsigned int words[IN6ADDRSZ / INT16SZ];
int i;
const unsigned char *next_src, *src_end;
unsigned int *next_dest;
next_src = src;
src_end = src + IN6ADDRSZ;
next_dest = words;
i = 0;
do {
unsigned int next_word = (unsigned int)*next_src++;
next_word <<= 8;
next_word |= (unsigned int)*next_src++;
*next_dest++ = next_word;
if (next_word == 0) {
if (cur.base == -1) {
cur.base = i;
cur.len = 1;
}
else {
cur.len++;
}
} else {
if (cur.base != -1) {
if (best.base == -1 || cur.len > best.len) {
best = cur;
}
cur.base = -1;
}
}
i++;
} while (next_src < src_end);
if (cur.base != -1) {
if (best.base == -1 || cur.len > best.len) {
best = cur;
}
}
if (best.base != -1 && best.len < 2) {
best.base = -1;
}
tp = tmp;
for (i = 0; i < (IN6ADDRSZ / INT16SZ);) {
if (i == best.base) {
*tp++ = ':';
i += best.len;
continue;
}
if (i != 0) {
*tp++ = ':';
}
if (i == 6 && best.base == 0 &&
(best.len == 6 || (best.len == 5 && words[5] == 0xffff))) {
if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp))) {
return (NULL);
}
tp += strlen(tp);
break;
}
tp += apr_snprintf(tp, sizeof tmp - (tp - tmp), "%x", words[i]);
i++;
}
if (best.base != -1 && (best.base + best.len) == (IN6ADDRSZ / INT16SZ)) {
*tp++ = ':';
}
*tp++ = '\0';
if ((apr_size_t)(tp - tmp) > size) {
errno = ENOSPC;
return (NULL);
}
strcpy(dst, tmp);
return (dst);
}
#endif