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/* This is from the BIND 4.9.4 release, modified to compile by itself */
/* Copyright (c) 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.
*
* SPDX-License-Identifier: ISC
*/
#include "curl_setup.h"
#ifndef HAVE_INET_PTON
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#include "inet_pton.h"
#define IN6ADDRSZ 16
#define INADDRSZ 4
#define INT16SZ 2
/*
* If USE_IPV6 is disabled, we still want to parse IPv6 addresses, so make
* sure we have _some_ value for AF_INET6 without polluting our fake value
* everywhere.
*/
#if !defined(USE_IPV6) && !defined(AF_INET6)
#define AF_INET6 (AF_INET + 1)
#endif
/*
* WARNING: Do not even consider trying to compile this on a system where
* sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
*/
static int inet_pton4(const char *src, unsigned char *dst);
static int inet_pton6(const char *src, unsigned char *dst);
/* int
* inet_pton(af, src, dst)
* convert from presentation format (which usually means ASCII printable)
* to network format (which is usually some kind of binary format).
* return:
* 1 if the address was valid for the specified address family
* 0 if the address was not valid (`dst' is untouched in this case)
* -1 if some other error occurred (`dst' is untouched in this case, too)
* notice:
* On Windows we store the error in the thread errno, not
* in the Winsock error code. This is to avoid losing the
* actual last Winsock error. When this function returns
* -1, check errno not SOCKERRNO.
* author:
* Paul Vixie, 1996.
*/
int
Curl_inet_pton(int af, const char *src, void *dst)
{
switch(af) {
case AF_INET:
return (inet_pton4(src, (unsigned char *)dst));
case AF_INET6:
return (inet_pton6(src, (unsigned char *)dst));
default:
errno = EAFNOSUPPORT;
return (-1);
}
/* NOTREACHED */
}
/* int
* inet_pton4(src, dst)
* like inet_aton() but without all the hexadecimal and shorthand.
* return:
* 1 if `src' is a valid dotted quad, else 0.
* notice:
* does not touch `dst' unless it is returning 1.
* author:
* Paul Vixie, 1996.
*/
static int
inet_pton4(const char *src, unsigned char *dst)
{
static const char digits[] = "0123456789";
int saw_digit, octets, ch;
unsigned char tmp[INADDRSZ], *tp;
saw_digit = 0;
octets = 0;
tp = tmp;
*tp = 0;
while((ch = *src++) != '\0') {
const char *pch;
pch = strchr(digits, ch);
if(pch) {
unsigned int val = (unsigned int)(*tp * 10) +
(unsigned int)(pch - digits);
if(saw_digit && *tp == 0)
return (0);
if(val > 255)
return (0);
*tp = (unsigned char)val;
if(!saw_digit) {
if(++octets > 4)
return (0);
saw_digit = 1;
}
}
else if(ch == '.' && saw_digit) {
if(octets == 4)
return (0);
*++tp = 0;
saw_digit = 0;
}
else
return (0);
}
if(octets < 4)
return (0);
memcpy(dst, tmp, INADDRSZ);
return (1);
}
/* int
* inet_pton6(src, dst)
* convert presentation level address to network order binary form.
* return:
* 1 if `src' is a valid [RFC1884 2.2] address, else 0.
* notice:
* (1) does not touch `dst' unless it is returning 1.
* (2) :: in a full address is silently ignored.
* credit:
* inspired by Mark Andrews.
* author:
* Paul Vixie, 1996.
*/
static int
inet_pton6(const char *src, unsigned char *dst)
{
static const char xdigits_l[] = "0123456789abcdef",
xdigits_u[] = "0123456789ABCDEF";
unsigned char tmp[IN6ADDRSZ], *tp, *endp, *colonp;
const char *curtok;
int ch, saw_xdigit;
size_t val;
memset((tp = tmp), 0, IN6ADDRSZ);
endp = tp + IN6ADDRSZ;
colonp = NULL;
/* Leading :: requires some special handling. */
if(*src == ':')
if(*++src != ':')
return (0);
curtok = src;
saw_xdigit = 0;
val = 0;
while((ch = *src++) != '\0') {
const char *xdigits;
const char *pch;
pch = strchr((xdigits = xdigits_l), ch);
if(!pch)
pch = strchr((xdigits = xdigits_u), ch);
if(pch) {
val <<= 4;
val |= (pch - xdigits);
if(++saw_xdigit > 4)
return (0);
continue;
}
if(ch == ':') {
curtok = src;
if(!saw_xdigit) {
if(colonp)
return (0);
colonp = tp;
continue;
}
if(tp + INT16SZ > endp)
return (0);
*tp++ = (unsigned char) ((val >> 8) & 0xff);
*tp++ = (unsigned char) (val & 0xff);
saw_xdigit = 0;
val = 0;
continue;
}
if(ch == '.' && ((tp + INADDRSZ) <= endp) &&
inet_pton4(curtok, tp) > 0) {
tp += INADDRSZ;
saw_xdigit = 0;
break; /* '\0' was seen by inet_pton4(). */
}
return (0);
}
if(saw_xdigit) {
if(tp + INT16SZ > endp)
return (0);
*tp++ = (unsigned char) ((val >> 8) & 0xff);
*tp++ = (unsigned char) (val & 0xff);
}
if(colonp) {
/*
* Since some memmove()'s erroneously fail to handle
* overlapping regions, we will do the shift by hand.
*/
const ssize_t n = tp - colonp;
ssize_t i;
if(tp == endp)
return (0);
for(i = 1; i <= n; i++) {
*(endp - i) = *(colonp + n - i);
*(colonp + n - i) = 0;
}
tp = endp;
}
if(tp != endp)
return (0);
memcpy(dst, tmp, IN6ADDRSZ);
return (1);
}
#endif /* HAVE_INET_PTON */
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