269 lines
6.7 KiB
C
269 lines
6.7 KiB
C
/* inet_pton.c -- convert IPv4 and IPv6 addresses from text to binary form
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Copyright (C) 2006, 2008-2021 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/*
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* Copyright (c) 1996,1999 by 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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#include <config.h>
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/* Specification. */
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#include <arpa/inet.h>
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#if HAVE_DECL_INET_PTON
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# undef inet_pton
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int
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rpl_inet_pton (int af, const char *restrict src, void *restrict dst)
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{
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return inet_pton (af, src, dst);
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}
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#else
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# include <c-ctype.h>
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# include <string.h>
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# include <errno.h>
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# define NS_INADDRSZ 4
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# define NS_IN6ADDRSZ 16
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# define NS_INT16SZ 2
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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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# if HAVE_IPV6
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static int inet_pton6 (const char *src, unsigned char *dst);
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# endif
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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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* author:
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* Paul Vixie, 1996.
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*/
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int
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inet_pton (int af, const char *restrict src, void *restrict dst)
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{
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switch (af)
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{
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case AF_INET:
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return (inet_pton4 (src, dst));
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# if HAVE_IPV6
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case AF_INET6:
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return (inet_pton6 (src, dst));
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# endif
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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, octal (with the
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* exception of 0) 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 *restrict src, unsigned char *restrict dst)
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{
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int saw_digit, octets, ch;
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unsigned char tmp[NS_INADDRSZ], *tp;
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saw_digit = 0;
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octets = 0;
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*(tp = tmp) = 0;
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while ((ch = *src++) != '\0')
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{
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if (ch >= '0' && ch <= '9')
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{
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unsigned new = *tp * 10 + (ch - '0');
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if (saw_digit && *tp == 0)
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return (0);
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if (new > 255)
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return (0);
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*tp = new;
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if (!saw_digit)
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{
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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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{
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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, NS_INADDRSZ);
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return (1);
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}
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# if HAVE_IPV6
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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 *restrict src, unsigned char *restrict dst)
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{
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static const char xdigits[] = "0123456789abcdef";
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unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
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const char *curtok;
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int ch, saw_xdigit;
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unsigned val;
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tp = memset (tmp, '\0', NS_IN6ADDRSZ);
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endp = tp + NS_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 = c_tolower (*src++)) != '\0')
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{
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const char *pch;
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pch = strchr (xdigits, ch);
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if (pch != NULL)
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{
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val <<= 4;
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val |= (pch - xdigits);
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if (val > 0xffff)
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return (0);
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saw_xdigit = 1;
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continue;
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}
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if (ch == ':')
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{
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curtok = src;
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if (!saw_xdigit)
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{
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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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else if (*src == '\0')
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{
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return (0);
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}
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if (tp + NS_INT16SZ > endp)
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return (0);
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*tp++ = (u_char) (val >> 8) & 0xff;
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*tp++ = (u_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 + NS_INADDRSZ) <= endp) &&
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inet_pton4 (curtok, tp) > 0)
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{
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tp += NS_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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{
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if (tp + NS_INT16SZ > endp)
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return (0);
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*tp++ = (u_char) (val >> 8) & 0xff;
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*tp++ = (u_char) val & 0xff;
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}
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if (colonp != NULL)
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{
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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 int n = tp - colonp;
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int 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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{
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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, NS_IN6ADDRSZ);
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return (1);
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}
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# endif
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#endif
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