init repo.
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243
third_party/curl/lib/inet_pton.c
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243
third_party/curl/lib/inet_pton.c
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/* This is from the BIND 4.9.4 release, modified to compile by itself */
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/* Copyright (c) Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*
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* SPDX-License-Identifier: ISC
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*/
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#include "curl_setup.h"
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#ifndef HAVE_INET_PTON
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#ifdef HAVE_SYS_PARAM_H
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#include <sys/param.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#ifdef HAVE_ARPA_INET_H
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#include <arpa/inet.h>
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#endif
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#include "inet_pton.h"
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#define IN6ADDRSZ 16
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#define INADDRSZ 4
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#define INT16SZ 2
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/*
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* If USE_IPV6 is disabled, we still want to parse IPv6 addresses, so make
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* sure we have _some_ value for AF_INET6 without polluting our fake value
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* everywhere.
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*/
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#if !defined(USE_IPV6) && !defined(AF_INET6)
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#define AF_INET6 (AF_INET + 1)
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#endif
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/*
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* WARNING: Don't even consider trying to compile this on a system where
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* sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
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*/
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static int inet_pton4(const char *src, unsigned char *dst);
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static int inet_pton6(const char *src, unsigned char *dst);
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/* int
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* inet_pton(af, src, dst)
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* convert from presentation format (which usually means ASCII printable)
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* to network format (which is usually some kind of binary format).
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* return:
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* 1 if the address was valid for the specified address family
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* 0 if the address wasn't valid (`dst' is untouched in this case)
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* -1 if some other error occurred (`dst' is untouched in this case, too)
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* notice:
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* On Windows we store the error in the thread errno, not
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* in the winsock error code. This is to avoid losing the
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* actual last winsock error. So when this function returns
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* -1, check errno not SOCKERRNO.
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* author:
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* Paul Vixie, 1996.
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*/
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int
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Curl_inet_pton(int af, const char *src, void *dst)
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{
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switch(af) {
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case AF_INET:
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return (inet_pton4(src, (unsigned char *)dst));
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case AF_INET6:
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return (inet_pton6(src, (unsigned char *)dst));
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default:
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errno = EAFNOSUPPORT;
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return (-1);
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}
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/* NOTREACHED */
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}
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/* int
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* inet_pton4(src, dst)
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* like inet_aton() but without all the hexadecimal and shorthand.
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* return:
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* 1 if `src' is a valid dotted quad, else 0.
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* notice:
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* does not touch `dst' unless it's returning 1.
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* author:
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* Paul Vixie, 1996.
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*/
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static int
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inet_pton4(const char *src, unsigned char *dst)
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{
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static const char digits[] = "0123456789";
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int saw_digit, octets, ch;
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unsigned char tmp[INADDRSZ], *tp;
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saw_digit = 0;
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octets = 0;
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tp = tmp;
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*tp = 0;
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while((ch = *src++) != '\0') {
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const char *pch;
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pch = strchr(digits, ch);
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if(pch) {
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unsigned int val = (unsigned int)(*tp * 10) +
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(unsigned int)(pch - digits);
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if(saw_digit && *tp == 0)
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return (0);
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if(val > 255)
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return (0);
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*tp = (unsigned char)val;
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if(!saw_digit) {
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if(++octets > 4)
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return (0);
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saw_digit = 1;
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}
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}
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else if(ch == '.' && saw_digit) {
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if(octets == 4)
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return (0);
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*++tp = 0;
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saw_digit = 0;
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}
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else
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return (0);
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}
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if(octets < 4)
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return (0);
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memcpy(dst, tmp, INADDRSZ);
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return (1);
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}
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/* int
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* inet_pton6(src, dst)
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* convert presentation level address to network order binary form.
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* return:
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* 1 if `src' is a valid [RFC1884 2.2] address, else 0.
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* notice:
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* (1) does not touch `dst' unless it's returning 1.
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* (2) :: in a full address is silently ignored.
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* credit:
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* inspired by Mark Andrews.
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* author:
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* Paul Vixie, 1996.
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*/
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static int
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inet_pton6(const char *src, unsigned char *dst)
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{
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static const char xdigits_l[] = "0123456789abcdef",
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xdigits_u[] = "0123456789ABCDEF";
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unsigned char tmp[IN6ADDRSZ], *tp, *endp, *colonp;
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const char *curtok;
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int ch, saw_xdigit;
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size_t val;
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memset((tp = tmp), 0, IN6ADDRSZ);
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endp = tp + IN6ADDRSZ;
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colonp = NULL;
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/* Leading :: requires some special handling. */
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if(*src == ':')
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if(*++src != ':')
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return (0);
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curtok = src;
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saw_xdigit = 0;
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val = 0;
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while((ch = *src++) != '\0') {
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const char *xdigits;
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const char *pch;
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pch = strchr((xdigits = xdigits_l), ch);
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if(!pch)
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pch = strchr((xdigits = xdigits_u), ch);
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if(pch) {
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val <<= 4;
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val |= (pch - xdigits);
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if(++saw_xdigit > 4)
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return (0);
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continue;
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}
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if(ch == ':') {
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curtok = src;
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if(!saw_xdigit) {
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if(colonp)
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return (0);
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colonp = tp;
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continue;
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}
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if(tp + INT16SZ > endp)
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return (0);
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*tp++ = (unsigned char) ((val >> 8) & 0xff);
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*tp++ = (unsigned char) (val & 0xff);
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saw_xdigit = 0;
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val = 0;
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continue;
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}
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if(ch == '.' && ((tp + INADDRSZ) <= endp) &&
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inet_pton4(curtok, tp) > 0) {
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tp += INADDRSZ;
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saw_xdigit = 0;
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break; /* '\0' was seen by inet_pton4(). */
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}
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return (0);
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}
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if(saw_xdigit) {
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if(tp + INT16SZ > endp)
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return (0);
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*tp++ = (unsigned char) ((val >> 8) & 0xff);
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*tp++ = (unsigned char) (val & 0xff);
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}
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if(colonp) {
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/*
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* Since some memmove()'s erroneously fail to handle
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* overlapping regions, we'll do the shift by hand.
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*/
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const ssize_t n = tp - colonp;
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ssize_t i;
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if(tp == endp)
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return (0);
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for(i = 1; i <= n; i++) {
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*(endp - i) = *(colonp + n - i);
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*(colonp + n - i) = 0;
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}
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tp = endp;
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}
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if(tp != endp)
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return (0);
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memcpy(dst, tmp, IN6ADDRSZ);
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return (1);
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}
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#endif /* HAVE_INET_PTON */
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