281 lines
6.4 KiB
C
281 lines
6.4 KiB
C
/*-
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
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* Copyright (c) 1998,1999 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 ISC DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static const char rcsid[] = "$Id: inet_cidr_pton.c,v 1.6 2005/04/27 04:56:19 sra Exp $";
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "port_before.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <arpa/inet.h>
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#include <assert.h>
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#include <ctype.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "port_after.h"
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#ifdef SPRINTF_CHAR
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# define SPRINTF(x) strlen(sprintf/**/x)
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#else
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# define SPRINTF(x) ((size_t)sprintf x)
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#endif
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static int inet_cidr_pton_ipv4 (const char *src, u_char *dst, int *bits,
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int ipv6);
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static int inet_cidr_pton_ipv6 (const char *src, u_char *dst, int *bits);
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static int getbits(const char *, int ipv6);
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/*%
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* int
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* inet_cidr_pton(af, src, dst, *bits)
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* convert network address from presentation to network format.
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* accepts inet_pton()'s input for this "af" plus trailing "/CIDR".
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* "dst" is assumed large enough for its "af". "bits" is set to the
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* /CIDR prefix length, which can have defaults (like /32 for IPv4).
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* return:
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* -1 if an error occurred (inspect errno; ENOENT means bad format).
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* 0 if successful conversion occurred.
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* note:
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* 192.5.5.1/28 has a nonzero host part, which means it isn't a network
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* as called for by inet_net_pton() but it can be a host address with
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* an included netmask.
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* author:
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* Paul Vixie (ISC), October 1998
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*/
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int
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inet_cidr_pton(int af, const char *src, void *dst, int *bits) {
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switch (af) {
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case AF_INET:
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return (inet_cidr_pton_ipv4(src, dst, bits, 0));
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case AF_INET6:
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return (inet_cidr_pton_ipv6(src, dst, bits));
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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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}
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static const char digits[] = "0123456789";
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static int
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inet_cidr_pton_ipv4(const char *src, u_char *dst, int *pbits, int ipv6) {
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const u_char *odst = dst;
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int n, ch, tmp, bits;
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size_t size = 4;
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/* Get the mantissa. */
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while (ch = *src++, (isascii(ch) && isdigit(ch))) {
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tmp = 0;
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do {
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n = strchr(digits, ch) - digits;
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assert(n >= 0 && n <= 9);
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tmp *= 10;
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tmp += n;
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if (tmp > 255)
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goto enoent;
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} while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch));
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if (size-- == 0U)
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goto emsgsize;
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*dst++ = (u_char) tmp;
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if (ch == '\0' || ch == '/')
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break;
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if (ch != '.')
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goto enoent;
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}
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/* Get the prefix length if any. */
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bits = -1;
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if (ch == '/' && dst > odst) {
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bits = getbits(src, ipv6);
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if (bits == -2)
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goto enoent;
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} else if (ch != '\0')
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goto enoent;
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/* Prefix length can default to /32 only if all four octets spec'd. */
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if (bits == -1) {
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if (dst - odst == 4)
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bits = ipv6 ? 128 : 32;
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else
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goto enoent;
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}
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/* If nothing was written to the destination, we found no address. */
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if (dst == odst)
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goto enoent;
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/* If prefix length overspecifies mantissa, life is bad. */
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if (((bits - (ipv6 ? 96 : 0)) / 8) > (dst - odst))
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goto enoent;
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/* Extend address to four octets. */
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while (size-- > 0U)
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*dst++ = 0;
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*pbits = bits;
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return (0);
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enoent:
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errno = ENOENT;
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return (-1);
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emsgsize:
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errno = EMSGSIZE;
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return (-1);
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}
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static int
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inet_cidr_pton_ipv6(const char *src, u_char *dst, int *pbits) {
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static const char xdigits_l[] = "0123456789abcdef",
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xdigits_u[] = "0123456789ABCDEF";
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u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
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const char *xdigits, *curtok;
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int ch, saw_xdigit;
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u_int val;
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int bits;
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memset((tp = 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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bits = -1;
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while ((ch = *src++) != '\0') {
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const char *pch;
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if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
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pch = strchr((xdigits = xdigits_u), ch);
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if (pch != NULL) {
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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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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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} else if (*src == '\0') {
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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_cidr_pton_ipv4(curtok, tp, &bits, 1) == 0) {
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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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if (ch == '/') {
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bits = getbits(src, 1);
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if (bits == -2)
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goto enoent;
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break;
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}
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goto enoent;
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}
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if (saw_xdigit) {
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if (tp + NS_INT16SZ > endp)
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goto emsgsize;
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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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* 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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goto enoent;
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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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memcpy(dst, tmp, NS_IN6ADDRSZ);
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*pbits = bits;
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return (0);
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enoent:
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errno = ENOENT;
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return (-1);
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emsgsize:
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errno = EMSGSIZE;
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return (-1);
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}
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static int
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getbits(const char *src, int ipv6) {
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int bits = 0;
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char *cp, ch;
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if (*src == '\0') /*%< syntax */
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return (-2);
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do {
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ch = *src++;
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cp = strchr(digits, ch);
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if (cp == NULL) /*%< syntax */
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return (-2);
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bits *= 10;
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bits += cp - digits;
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if (bits == 0 && *src != '\0') /*%< no leading zeros */
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return (-2);
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if (bits > (ipv6 ? 128 : 32)) /*%< range error */
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return (-2);
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} while (*src != '\0');
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return (bits);
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}
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/*! \file */
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