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/* $Id$ */
/*
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
* 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 ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC 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 "setup.h"
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
# include <arpa/inet.h>
#endif
#ifdef HAVE_ARPA_NAMESER_H
# include <arpa/nameser.h>
#else
# include "nameser.h"
#endif
#ifdef HAVE_ARPA_NAMESER_COMPAT_H
# include <arpa/nameser_compat.h>
#endif
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "ares_ipv6.h"
#include "inet_net_pton.h"
#if !defined(HAVE_INET_NET_PTON) || !defined(HAVE_INET_NET_PTON_IPV6)
/*
* static int
* inet_net_pton_ipv4(src, dst, size)
* convert IPv4 network number from presentation to network format.
* accepts hex octets, hex strings, decimal octets, and /CIDR.
* "size" is in bytes and describes "dst".
* return:
* number of bits, either imputed classfully or specified with /CIDR,
* or -1 if some failure occurred (check errno). ENOENT means it was
* not an IPv4 network specification.
* note:
* network byte order assumed. this means 192.5.5.240/28 has
* 0b11110000 in its fourth octet.
* note:
* On Windows we store the error in the thread errno, not
* in the winsock error code. This is to avoid loosing the
* actual last winsock error. So use macro ERRNO to fetch the
* errno this funtion sets when returning (-1), not SOCKERRNO.
* author:
* Paul Vixie (ISC), June 1996
*/
static int
inet_net_pton_ipv4(const char *src, unsigned char *dst, size_t size)
{
static const char xdigits[] = "0123456789abcdef";
static const char digits[] = "0123456789";
int n, ch, tmp = 0, dirty, bits;
const unsigned char *odst = dst;
ch = *src++;
if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
&& ISXDIGIT(src[1])) {
/* Hexadecimal: Eat nybble string. */
if (size <= 0U)
goto emsgsize;
dirty = 0;
src++; /* skip x or X. */
while ((ch = *src++) != '\0' && ISXDIGIT(ch)) {
if (ISUPPER(ch))
ch = tolower(ch);
n = (int)(strchr(xdigits, ch) - xdigits);
if (dirty == 0)
tmp = n;
else
tmp = (tmp << 4) | n;
if (++dirty == 2) {
if (size-- <= 0U)
goto emsgsize;
*dst++ = (unsigned char) tmp;
dirty = 0;
}
}
if (dirty) { /* Odd trailing nybble? */
if (size-- <= 0U)
goto emsgsize;
*dst++ = (unsigned char) (tmp << 4);
}
} else if (ISDIGIT(ch)) {
/* Decimal: eat dotted digit string. */
for (;;) {
tmp = 0;
do {
n = (int)(strchr(digits, ch) - digits);
tmp *= 10;
tmp += n;
if (tmp > 255)
goto enoent;
} while ((ch = *src++) != '\0' &&
ISDIGIT(ch));
if (size-- <= 0U)
goto emsgsize;
*dst++ = (unsigned char) tmp;
if (ch == '\0' || ch == '/')
break;
if (ch != '.')
goto enoent;
ch = *src++;
if (!ISDIGIT(ch))
goto enoent;
}
} else
goto enoent;
bits = -1;
if (ch == '/' &&
ISDIGIT(src[0]) && dst > odst) {
/* CIDR width specifier. Nothing can follow it. */
ch = *src++; /* Skip over the /. */
bits = 0;
do {
n = (int)(strchr(digits, ch) - digits);
bits *= 10;
bits += n;
} while ((ch = *src++) != '\0' && ISDIGIT(ch));
if (ch != '\0')
goto enoent;
if (bits > 32)
goto emsgsize;
}
/* Firey death and destruction unless we prefetched EOS. */
if (ch != '\0')
goto enoent;
/* If nothing was written to the destination, we found no address. */
if (dst == odst)
goto enoent;
/* If no CIDR spec was given, infer width from net class. */
if (bits == -1) {
if (*odst >= 240) /* Class E */
bits = 32;
else if (*odst >= 224) /* Class D */
bits = 8;
else if (*odst >= 192) /* Class C */
bits = 24;
else if (*odst >= 128) /* Class B */
bits = 16;
else /* Class A */
bits = 8;
/* If imputed mask is narrower than specified octets, widen. */
if (bits < ((dst - odst) * 8))
bits = (int)(dst - odst) * 8;
/*
* If there are no additional bits specified for a class D
* address adjust bits to 4.
*/
if (bits == 8 && *odst == 224)
bits = 4;
}
/* Extend network to cover the actual mask. */
while (bits > ((dst - odst) * 8)) {
if (size-- <= 0U)
goto emsgsize;
*dst++ = '\0';
}
return (bits);
enoent:
SET_ERRNO(ENOENT);
return (-1);
emsgsize:
SET_ERRNO(EMSGSIZE);
return (-1);
}
static int
getbits(const char *src, int *bitsp)
{
static const char digits[] = "0123456789";
int n;
int val;
char ch;
val = 0;
n = 0;
while ((ch = *src++) != '\0') {
const char *pch;
pch = strchr(digits, ch);
if (pch != NULL) {
if (n++ != 0 && val == 0) /* no leading zeros */
return (0);
val *= 10;
val += (pch - digits);
if (val > 128) /* range */
return (0);
continue;
}
return (0);
}
if (n == 0)
return (0);
*bitsp = val;
return (1);
}
static int
getv4(const char *src, unsigned char *dst, int *bitsp)
{
static const char digits[] = "0123456789";
unsigned char *odst = dst;
int n;
unsigned int val;
char ch;
val = 0;
n = 0;
while ((ch = *src++) != '\0') {
const char *pch;
pch = strchr(digits, ch);
if (pch != NULL) {
if (n++ != 0 && val == 0) /* no leading zeros */
return (0);
val *= 10;
val += (pch - digits);
if (val > 255) /* range */
return (0);
continue;
}
if (ch == '.' || ch == '/') {
if (dst - odst > 3) /* too many octets? */
return (0);
*dst++ = (unsigned char)val;
if (ch == '/')
return (getbits(src, bitsp));
val = 0;
n = 0;
continue;
}
return (0);
}
if (n == 0)
return (0);
if (dst - odst > 3) /* too many octets? */
return (0);
*dst++ = (unsigned char)val;
return (1);
}
static int
inet_net_pton_ipv6(const char *src, unsigned char *dst, size_t size)
{
static const char xdigits_l[] = "0123456789abcdef",
xdigits_u[] = "0123456789ABCDEF";
unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
const char *xdigits, *curtok;
int ch, saw_xdigit;
unsigned int val;
int digits;
int bits;
size_t bytes;
int words;
int ipv4;
memset((tp = tmp), '\0', NS_IN6ADDRSZ);
endp = tp + NS_IN6ADDRSZ;
colonp = NULL;
/* Leading :: requires some special handling. */
if (*src == ':')
if (*++src != ':')
goto enoent;
curtok = src;
saw_xdigit = 0;
val = 0;
digits = 0;
bits = -1;
ipv4 = 0;
while ((ch = *src++) != '\0') {
const char *pch;
if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
pch = strchr((xdigits = xdigits_u), ch);
if (pch != NULL) {
val <<= 4;
val |= (pch - xdigits);
if (++digits > 4)
goto enoent;
saw_xdigit = 1;
continue;
}
if (ch == ':') {
curtok = src;
if (!saw_xdigit) {
if (colonp)
goto enoent;
colonp = tp;
continue;
} else if (*src == '\0')
goto enoent;
if (tp + NS_INT16SZ > endp)
return (0);
*tp++ = (unsigned char)((val >> 8) & 0xff);
*tp++ = (unsigned char)(val & 0xff);
saw_xdigit = 0;
digits = 0;
val = 0;
continue;
}
if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
getv4(curtok, tp, &bits) > 0) {
tp += NS_INADDRSZ;
saw_xdigit = 0;
ipv4 = 1;
break; /* '\0' was seen by inet_pton4(). */
}
if (ch == '/' && getbits(src, &bits) > 0)
break;
goto enoent;
}
if (saw_xdigit) {
if (tp + NS_INT16SZ > endp)
goto enoent;
*tp++ = (unsigned char)((val >> 8) & 0xff);
*tp++ = (unsigned char)(val & 0xff);
}
if (bits == -1)
bits = 128;
words = (bits + 15) / 16;
if (words < 2)
words = 2;
if (ipv4)
words = 8;
endp = tmp + 2 * words;
if (colonp != NULL) {
/*
* Since some memmove()'s erroneously fail to handle
* overlapping regions, we'll do the shift by hand.
*/
const int n = (int)(tp - colonp);
int i;
if (tp == endp)
goto enoent;
for (i = 1; i <= n; i++) {
endp[- i] = colonp[n - i];
colonp[n - i] = 0;
}
tp = endp;
}
if (tp != endp)
goto enoent;
bytes = (bits + 7) / 8;
if (bytes > size)
goto emsgsize;
memcpy(dst, tmp, bytes);
return (bits);
enoent:
SET_ERRNO(ENOENT);
return (-1);
emsgsize:
SET_ERRNO(EMSGSIZE);
return (-1);
}
/*
* int
* inet_net_pton(af, src, dst, size)
* convert network number from presentation to network format.
* accepts hex octets, hex strings, decimal octets, and /CIDR.
* "size" is in bytes and describes "dst".
* return:
* number of bits, either imputed classfully or specified with /CIDR,
* or -1 if some failure occurred (check errno). ENOENT means it was
* not a valid network specification.
* note:
* On Windows we store the error in the thread errno, not
* in the winsock error code. This is to avoid loosing the
* actual last winsock error. So use macro ERRNO to fetch the
* errno this funtion sets when returning (-1), not SOCKERRNO.
* author:
* Paul Vixie (ISC), June 1996
*/
int
ares_inet_net_pton(int af, const char *src, void *dst, size_t size)
{
switch (af) {
case AF_INET:
return (inet_net_pton_ipv4(src, dst, size));
case AF_INET6:
return (inet_net_pton_ipv6(src, dst, size));
default:
SET_ERRNO(EAFNOSUPPORT);
return (-1);
}
}
#endif
#ifndef HAVE_INET_PTON
int ares_inet_pton(int af, const char *src, void *dst)
{
int size, result;
if (af == AF_INET)
size = sizeof(struct in_addr);
else if (af == AF_INET6)
size = sizeof(struct in6_addr);
else
{
SET_ERRNO(EAFNOSUPPORT);
return -1;
}
result = ares_inet_net_pton(af, src, dst, size);
if (result == -1 && ERRNO == ENOENT)
return 0;
return (result > -1 ? 1 : -1);
}
#endif
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