mirror of
https://github.com/reactos/wine.git
synced 2024-12-05 10:17:57 +00:00
445 lines
8.8 KiB
C
445 lines
8.8 KiB
C
/*
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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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#include <sys/types.h>
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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_NAMESER_H
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# include <arpa/nameser.h>
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#endif
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#include <ctype.h>
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#include <errno.h>
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#ifdef HAVE_RESOLV_H
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# include <resolv.h>
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#endif
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#include <string.h>
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#include <ctype.h>
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/* Data. */
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static const char digits[] = "0123456789";
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/* Forward. */
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static int special(int);
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static int printable(int);
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/* Public. */
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/*
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* dns_ns_name_ntop(src, dst, dstsiz)
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* Convert an encoded domain name to printable ascii as per RFC1035.
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* return:
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* Number of bytes written to buffer, or -1 (with errno set)
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* notes:
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* The root is returned as "."
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* All other domains are returned in non absolute form
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*/
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static int
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dns_ns_name_ntop(const u_char *src, char *dst, size_t dstsiz) {
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const u_char *cp;
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char *dn, *eom;
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u_char c;
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u_int n;
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cp = src;
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dn = dst;
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eom = dst + dstsiz;
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while ((n = *cp++) != 0) {
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if ((n & NS_CMPRSFLGS) != 0 && n != 0x41) {
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/* Some kind of compression pointer. */
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return (-1);
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}
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if (dn != dst) {
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if (dn >= eom) {
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return (-1);
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}
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*dn++ = '.';
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}
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if (n == 0x41) {
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n = *cp++ / 8;
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if (dn + n * 2 + 4 >= eom) {
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return (-1);
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}
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*dn++ = '\\';
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*dn++ = '[';
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*dn++ = 'x';
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while (n-- > 0) {
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unsigned u;
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c = *cp++;
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u = c >> 4;
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*dn++ = u > 9 ? 'a' + u - 10 : '0' + u;
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u = c & 0xf;
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*dn++ = u > 9 ? 'a' + u - 10 : '0' + u;
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}
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*dn++ = ']';
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continue;
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}
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if (dn + n >= eom) {
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return (-1);
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}
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for ((void)NULL; n > 0; n--) {
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c = *cp++;
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if (special(c)) {
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if (dn + 1 >= eom) {
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return (-1);
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}
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*dn++ = '\\';
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*dn++ = (char)c;
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} else if (!printable(c)) {
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if (dn + 3 >= eom) {
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return (-1);
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}
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*dn++ = '\\';
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*dn++ = digits[c / 100];
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*dn++ = digits[(c % 100) / 10];
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*dn++ = digits[c % 10];
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} else {
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if (dn >= eom) {
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return (-1);
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}
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*dn++ = (char)c;
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}
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}
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}
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if (dn == dst) {
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if (dn >= eom) {
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return (-1);
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}
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*dn++ = '.';
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}
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if (dn >= eom) {
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return (-1);
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}
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*dn++ = '\0';
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return (dn - dst);
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}
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/*
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* dns_ns_name_pton(src, dst, dstsiz)
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* Convert a ascii string into an encoded domain name as per RFC1035.
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* return:
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* -1 if it fails
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* 1 if string was fully qualified
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* 0 is string was not fully qualified
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* notes:
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* Enforces label and domain length limits.
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*/
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int
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dns_ns_name_pton(const char *src, u_char *dst, size_t dstsiz) {
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u_char *label, *bp, *eom;
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int c, n, escaped;
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char *cp;
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escaped = 0;
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bp = dst;
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eom = dst + dstsiz;
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label = bp++;
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while ((c = *src++) != 0) {
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if (escaped) {
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if ((cp = strchr(digits, c)) != NULL) {
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n = (cp - digits) * 100;
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if ((c = *src++) == 0 ||
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(cp = strchr(digits, c)) == NULL) {
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return (-1);
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}
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n += (cp - digits) * 10;
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if ((c = *src++) == 0 ||
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(cp = strchr(digits, c)) == NULL) {
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return (-1);
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}
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n += (cp - digits);
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if (n > 255) {
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return (-1);
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}
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c = n;
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} else if (c == '[' && label == bp - 1 && *src == 'x') {
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/* Theoretically we would have to handle \[o
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as well but we do not since we do not need
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it internally. */
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*label = 0x41;
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label = bp++;
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++src;
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while (isxdigit (*src)) {
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n = *src > '9' ? *src - 'a' + 10 : *src - '0';
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++src;
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if (! isxdigit(*src)) {
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return (-1);
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}
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n <<= 4;
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n += *src > '9' ? *src - 'a' + 10 : *src - '0';
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if (bp + 1 >= eom) {
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return (-1);
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}
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*bp++ = n;
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++src;
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}
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*label = (bp - label - 1) * 8;
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if (*src++ != ']' || *src++ != '.') {
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return (-1);
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}
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escaped = 0;
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label = bp++;
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if (bp >= eom) {
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return (-1);
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}
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continue;
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}
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escaped = 0;
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} else if (c == '\\') {
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escaped = 1;
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continue;
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} else if (c == '.') {
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c = (bp - label - 1);
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if ((c & NS_CMPRSFLGS) != 0) { /* Label too big. */
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return (-1);
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}
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if (label >= eom) {
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return (-1);
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}
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*label = c;
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/* Fully qualified ? */
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if (*src == '\0') {
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if (c != 0) {
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if (bp >= eom) {
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return (-1);
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}
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*bp++ = '\0';
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}
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if ((bp - dst) > NS_MAXCDNAME) {
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return (-1);
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}
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return (1);
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}
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if (c == 0 || *src == '.') {
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return (-1);
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}
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label = bp++;
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continue;
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}
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if (bp >= eom) {
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return (-1);
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}
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*bp++ = (u_char)c;
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}
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c = (bp - label - 1);
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if ((c & NS_CMPRSFLGS) != 0) { /* Label too big. */
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return (-1);
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}
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if (label >= eom) {
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return (-1);
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}
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*label = c;
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if (c != 0) {
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if (bp >= eom) {
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return (-1);
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}
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*bp++ = 0;
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}
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if ((bp - dst) > NS_MAXCDNAME) { /* src too big */
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return (-1);
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}
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return (0);
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}
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/*
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* dns_ns_name_unpack(msg, eom, src, dst, dstsiz)
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* Unpack a domain name from a message, source may be compressed.
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* return:
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* -1 if it fails, or consumed octets if it succeeds.
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*/
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static int
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dns_ns_name_unpack(const u_char *msg, const u_char *eom, const u_char *src,
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u_char *dst, size_t dstsiz)
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{
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const u_char *srcp, *dstlim;
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u_char *dstp;
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int n, len, checked;
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len = -1;
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checked = 0;
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dstp = dst;
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srcp = src;
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dstlim = dst + dstsiz;
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if (srcp < msg || srcp >= eom) {
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return (-1);
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}
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/* Fetch next label in domain name. */
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while ((n = *srcp++) != 0) {
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/* Check for indirection. */
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switch (n & NS_CMPRSFLGS) {
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case 0x40:
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if (n == 0x41) {
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if (dstp + 1 >= dstlim) {
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return (-1);
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}
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*dstp++ = 0x41;
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n = *srcp++ / 8;
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++checked;
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} else {
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return (-1); /* flag error */
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}
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/* FALLTHROUGH */
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case 0:
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/* Limit checks. */
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if (dstp + n + 1 >= dstlim || srcp + n >= eom) {
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return (-1);
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}
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checked += n + 1;
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dstp = memcpy(dstp, srcp - 1, n + 1);
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dstp += n + 1;
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srcp += n;
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break;
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case NS_CMPRSFLGS:
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if (srcp >= eom) {
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return (-1);
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}
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if (len < 0)
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len = srcp - src + 1;
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srcp = msg + (((n & 0x3f) << 8) | (*srcp & 0xff));
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if (srcp < msg || srcp >= eom) { /* Out of range. */
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return (-1);
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}
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checked += 2;
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/*
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* Check for loops in the compressed name;
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* if we've looked at the whole message,
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* there must be a loop.
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*/
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if (checked >= eom - msg) {
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return (-1);
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}
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break;
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default:
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return (-1); /* flag error */
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}
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}
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*dstp = '\0';
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if (len < 0)
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len = srcp - src;
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return (len);
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}
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/*
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* dns_ns_name_uncompress(msg, eom, src, dst, dstsiz)
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* Expand compressed domain name to presentation format.
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* return:
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* Number of bytes read out of `src', or -1 (with errno set).
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* note:
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* Root domain returns as "." not "".
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*/
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int
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dns_ns_name_uncompress(const u_char *msg, const u_char *eom, const u_char *src,
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char *dst, size_t dstsiz)
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{
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u_char tmp[NS_MAXCDNAME];
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int n;
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if ((n = dns_ns_name_unpack(msg, eom, src, tmp, sizeof tmp)) == -1)
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return (-1);
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if (dns_ns_name_ntop(tmp, dst, dstsiz) == -1)
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return (-1);
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return (n);
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}
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/*
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* dns_ns_name_skip(ptrptr, eom)
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* Advance *ptrptr to skip over the compressed name it points at.
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* return:
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* 0 on success, -1 (with errno set) on failure.
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*/
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int
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dns_ns_name_skip(const u_char **ptrptr, const u_char *eom) {
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const u_char *cp;
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u_int n;
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cp = *ptrptr;
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while (cp < eom && (n = *cp++) != 0) {
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/* Check for indirection. */
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switch (n & NS_CMPRSFLGS) {
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case 0: /* normal case, n == len */
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cp += n;
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continue;
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case NS_CMPRSFLGS: /* indirection */
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cp++;
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break;
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default: /* illegal type */
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return (-1);
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}
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break;
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}
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if (cp > eom) {
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return (-1);
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}
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*ptrptr = cp;
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return (0);
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}
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/* Private. */
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/*
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* special(ch)
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* Thinking in noninternationalized USASCII (per the DNS spec),
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* is this characted special ("in need of quoting") ?
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* return:
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* boolean.
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*/
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static int
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special(int ch) {
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switch (ch) {
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case 0x22: /* '"' */
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case 0x2E: /* '.' */
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case 0x3B: /* ';' */
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case 0x5C: /* '\\' */
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/* Special modifiers in zone files. */
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case 0x40: /* '@' */
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case 0x24: /* '$' */
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return (1);
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default:
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return (0);
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}
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}
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/*
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* printable(ch)
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* Thinking in noninternationalized USASCII (per the DNS spec),
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* is this character visible and not a space when printed ?
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* return:
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* boolean.
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*/
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static int
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printable(int ch) {
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return (ch > 0x20 && ch < 0x7f);
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}
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