417 lines
9.4 KiB
C
417 lines
9.4 KiB
C
/*
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* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
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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 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_net_pton.c,v 1.7.18.1 2005/04/27 05:00:53 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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/*%
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* static int
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* inet_net_pton_ipv4(src, dst, size)
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* convert IPv4 network number from presentation to network format.
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* accepts hex octets, hex strings, decimal octets, and /CIDR.
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* "size" is in bytes and describes "dst".
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* return:
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* number of bits, either imputed classfully or specified with /CIDR,
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* or -1 if some failure occurred (check errno). ENOENT means it was
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* not an IPv4 network specification.
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* note:
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* network byte order assumed. this means 192.5.5.240/28 has
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* 0b11110000 in its fourth octet.
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* author:
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* Paul Vixie (ISC), June 1996
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*/
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static int
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inet_net_pton_ipv4(const char *src, u_char *dst, size_t size) {
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static const char xdigits[] = "0123456789abcdef";
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static const char digits[] = "0123456789";
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int n, ch, tmp = 0, dirty, bits;
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const u_char *odst = dst;
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ch = *src++;
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if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
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&& isascii((unsigned char)(src[1]))
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&& isxdigit((unsigned char)(src[1]))) {
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/* Hexadecimal: Eat nybble string. */
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if (size <= 0U)
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goto emsgsize;
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dirty = 0;
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src++; /*%< skip x or X. */
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while ((ch = *src++) != '\0' && isascii(ch) && isxdigit(ch)) {
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if (isupper(ch))
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ch = tolower(ch);
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n = strchr(xdigits, ch) - xdigits;
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assert(n >= 0 && n <= 15);
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if (dirty == 0)
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tmp = n;
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else
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tmp = (tmp << 4) | n;
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if (++dirty == 2) {
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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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dirty = 0;
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}
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}
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if (dirty) { /*%< Odd trailing nybble? */
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if (size-- <= 0U)
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goto emsgsize;
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*dst++ = (u_char) (tmp << 4);
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}
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} else if (isascii(ch) && isdigit(ch)) {
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/* Decimal: eat dotted digit string. */
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for (;;) {
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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' &&
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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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ch = *src++;
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if (!isascii(ch) || !isdigit(ch))
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goto enoent;
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}
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} else
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goto enoent;
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bits = -1;
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if (ch == '/' && isascii((unsigned char)(src[0])) &&
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isdigit((unsigned char)(src[0])) && dst > odst) {
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/* CIDR width specifier. Nothing can follow it. */
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ch = *src++; /*%< Skip over the /. */
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bits = 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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bits *= 10;
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bits += n;
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} while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch));
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if (ch != '\0')
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goto enoent;
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if (bits > 32)
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goto emsgsize;
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}
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/* Firey death and destruction unless we prefetched EOS. */
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if (ch != '\0')
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goto enoent;
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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 no CIDR spec was given, infer width from net class. */
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if (bits == -1) {
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if (*odst >= 240) /*%< Class E */
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bits = 32;
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else if (*odst >= 224) /*%< Class D */
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bits = 8;
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else if (*odst >= 192) /*%< Class C */
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bits = 24;
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else if (*odst >= 128) /*%< Class B */
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bits = 16;
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else /*%< Class A */
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bits = 8;
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/* If imputed mask is narrower than specified octets, widen. */
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if (bits < ((dst - odst) * 8))
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bits = (dst - odst) * 8;
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/*
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* If there are no additional bits specified for a class D
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* address adjust bits to 4.
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*/
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if (bits == 8 && *odst == 224)
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bits = 4;
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}
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/* Extend network to cover the actual mask. */
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while (bits > ((dst - odst) * 8)) {
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if (size-- <= 0U)
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goto emsgsize;
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*dst++ = '\0';
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}
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return (bits);
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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 *bitsp) {
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static const char digits[] = "0123456789";
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int n;
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int val;
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char ch;
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val = 0;
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n = 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 != NULL) {
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if (n++ != 0 && val == 0) /*%< no leading zeros */
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return (0);
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val *= 10;
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val += (pch - digits);
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if (val > 128) /*%< range */
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return (0);
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continue;
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}
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return (0);
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}
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if (n == 0)
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return (0);
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*bitsp = val;
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return (1);
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}
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static int
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getv4(const char *src, u_char *dst, int *bitsp) {
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static const char digits[] = "0123456789";
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u_char *odst = dst;
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int n;
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u_int val;
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char ch;
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val = 0;
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n = 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 != NULL) {
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if (n++ != 0 && val == 0) /*%< no leading zeros */
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return (0);
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val *= 10;
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val += (pch - digits);
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if (val > 255) /*%< range */
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return (0);
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continue;
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}
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if (ch == '.' || ch == '/') {
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if (dst - odst > 3) /*%< too many octets? */
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return (0);
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*dst++ = val;
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if (ch == '/')
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return (getbits(src, bitsp));
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val = 0;
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n = 0;
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continue;
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}
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return (0);
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}
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if (n == 0)
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return (0);
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if (dst - odst > 3) /*%< too many octets? */
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return (0);
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*dst++ = val;
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return (1);
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}
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static int
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inet_net_pton_ipv6(const char *src, u_char *dst, size_t size) {
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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 digits;
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int bits;
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size_t bytes;
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int words;
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int ipv4;
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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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goto enoent;
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curtok = src;
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saw_xdigit = 0;
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val = 0;
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digits = 0;
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bits = -1;
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ipv4 = 0;
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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 (++digits > 4)
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goto enoent;
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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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goto enoent;
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colonp = tp;
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continue;
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} else if (*src == '\0')
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goto enoent;
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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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digits = 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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getv4(curtok, tp, &bits) > 0) {
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tp += NS_INADDRSZ;
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saw_xdigit = 0;
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ipv4 = 1;
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break; /*%< '\\0' was seen by inet_pton4(). */
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}
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if (ch == '/' && getbits(src, &bits) > 0)
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break;
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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 enoent;
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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 (bits == -1)
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bits = 128;
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words = (bits + 15) / 16;
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if (words < 2)
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words = 2;
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if (ipv4)
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words = 8;
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endp = tmp + 2 * words;
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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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if (tp != endp)
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goto enoent;
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bytes = (bits + 7) / 8;
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if (bytes > size)
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goto emsgsize;
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memcpy(dst, tmp, bytes);
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return (bits);
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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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/*%
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* int
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* inet_net_pton(af, src, dst, size)
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* convert network number from presentation to network format.
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* accepts hex octets, hex strings, decimal octets, and /CIDR.
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* "size" is in bytes and describes "dst".
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* return:
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* number of bits, either imputed classfully or specified with /CIDR,
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* or -1 if some failure occurred (check errno). ENOENT means it was
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* not a valid network specification.
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* author:
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* Paul Vixie (ISC), June 1996
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*/
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int
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inet_net_pton(int af, const char *src, void *dst, size_t size) {
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switch (af) {
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case AF_INET:
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return (inet_net_pton_ipv4(src, dst, size));
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case AF_INET6:
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return (inet_net_pton_ipv6(src, dst, size));
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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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/*
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* Weak aliases for applications that use certain private entry points,
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* and fail to include <arpa/inet.h>.
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*/
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#undef inet_net_pton
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__weak_reference(__inet_net_pton, inet_net_pton);
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/*! \file */
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