731 lines
15 KiB
C
731 lines
15 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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#include <sys/types.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <errno.h>
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#include <resolv.h>
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#include <string.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <limits.h>
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# define SPRINTF(x) ((size_t)sprintf x)
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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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static int dn_find(const u_char *, const u_char *,
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const u_char * const *,
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const u_char * const *);
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static int labellen(const u_char *);
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/* Public. */
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/*%
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* Convert an encoded domain name to printable ascii as per RFC1035.
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* return:
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*\li Number of bytes written to buffer, or -1 (with errno set)
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*
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* notes:
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*\li The root is returned as "."
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*\li All other domains are returned in non absolute form
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*/
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int
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ns_name_ntop(const u_char *src, char *dst, size_t dstsiz)
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{
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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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int l;
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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) == NS_CMPRSFLGS) {
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/* Some kind of compression pointer. */
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__set_errno (EMSGSIZE);
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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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__set_errno (EMSGSIZE);
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return (-1);
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}
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*dn++ = '.';
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}
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if ((l = labellen(cp - 1)) < 0) {
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__set_errno (EMSGSIZE);
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return(-1);
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}
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if (dn + l >= eom) {
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__set_errno (EMSGSIZE);
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return (-1);
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}
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for ((void)NULL; l > 0; l--) {
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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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__set_errno (EMSGSIZE);
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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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__set_errno (EMSGSIZE);
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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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__set_errno (EMSGSIZE);
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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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__set_errno (EMSGSIZE);
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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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__set_errno (EMSGSIZE);
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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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libresolv_hidden_def (ns_name_ntop)
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strong_alias (ns_name_ntop, __ns_name_ntop)
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/*%
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* Convert an ascii string into an encoded domain name as per RFC1035.
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*
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* return:
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*
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*\li -1 if it fails
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*\li 1 if string was fully qualified
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*\li 0 is string was not fully qualified
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*
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* notes:
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*\li Enforces label and domain length limits.
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*/
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int
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ns_name_pton(const char *src, u_char *dst, size_t dstsiz)
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{
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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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__set_errno (EMSGSIZE);
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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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__set_errno (EMSGSIZE);
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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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__set_errno (EMSGSIZE);
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return (-1);
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}
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c = n;
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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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__set_errno (EMSGSIZE);
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return (-1);
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}
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if (label >= eom) {
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__set_errno (EMSGSIZE);
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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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__set_errno (EMSGSIZE);
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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) > MAXCDNAME) {
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__set_errno (EMSGSIZE);
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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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__set_errno (EMSGSIZE);
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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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__set_errno (EMSGSIZE);
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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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__set_errno (EMSGSIZE);
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return (-1);
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}
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if (label >= eom) {
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__set_errno (EMSGSIZE);
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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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__set_errno (EMSGSIZE);
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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) > MAXCDNAME) { /*%< src too big */
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__set_errno (EMSGSIZE);
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return (-1);
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}
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return (0);
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}
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libresolv_hidden_def (ns_name_pton)
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/*%
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* Convert a network strings labels into all lowercase.
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*
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* return:
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*\li Number of bytes written to buffer, or -1 (with errno set)
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*
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* notes:
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*\li Enforces label and domain length limits.
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*/
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int
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ns_name_ntol(const u_char *src, u_char *dst, size_t dstsiz)
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{
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const u_char *cp;
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u_char *dn, *eom;
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u_char c;
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u_int n;
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int l;
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cp = src;
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dn = dst;
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eom = dst + dstsiz;
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if (dn >= eom) {
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__set_errno (EMSGSIZE);
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return (-1);
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}
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while ((n = *cp++) != 0) {
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if ((n & NS_CMPRSFLGS) == NS_CMPRSFLGS) {
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/* Some kind of compression pointer. */
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__set_errno (EMSGSIZE);
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return (-1);
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}
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*dn++ = n;
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if ((l = labellen(cp - 1)) < 0) {
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__set_errno (EMSGSIZE);
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return (-1);
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}
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if (dn + l >= eom) {
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__set_errno (EMSGSIZE);
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return (-1);
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}
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for ((void)NULL; l > 0; l--) {
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c = *cp++;
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if (isupper(c))
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*dn++ = tolower(c);
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else
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*dn++ = c;
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}
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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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* Unpack a domain name from a message, source may be compressed.
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*
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* return:
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*\li -1 if it fails, or consumed octets if it succeeds.
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*/
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int
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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, l;
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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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__set_errno (EMSGSIZE);
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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 0:
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/* Limit checks. */
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if ((l = labellen(srcp - 1)) < 0) {
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__set_errno (EMSGSIZE);
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return(-1);
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}
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if (dstp + l + 1 >= dstlim || srcp + l >= eom) {
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__set_errno (EMSGSIZE);
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return (-1);
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}
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checked += l + 1;
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*dstp++ = n;
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memcpy(dstp, srcp, l);
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dstp += l;
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srcp += l;
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break;
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case NS_CMPRSFLGS:
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if (srcp >= eom) {
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__set_errno (EMSGSIZE);
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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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__set_errno (EMSGSIZE);
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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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__set_errno (EMSGSIZE);
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return (-1);
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}
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break;
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default:
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__set_errno (EMSGSIZE);
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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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libresolv_hidden_def (ns_name_unpack)
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strong_alias (ns_name_unpack, __ns_name_unpack)
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|
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/*%
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* Pack domain name 'domain' into 'comp_dn'.
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*
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* return:
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*\li Size of the compressed name, or -1.
|
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*
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* notes:
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*\li 'dnptrs' is an array of pointers to previous compressed names.
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*\li dnptrs[0] is a pointer to the beginning of the message. The array
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* ends with NULL.
|
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*\li 'lastdnptr' is a pointer to the end of the array pointed to
|
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* by 'dnptrs'.
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*
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* Side effects:
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*\li The list of pointers in dnptrs is updated for labels inserted into
|
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* the message as we compress the name. If 'dnptr' is NULL, we don't
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* try to compress names. If 'lastdnptr' is NULL, we don't update the
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* list.
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*/
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int
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ns_name_pack(const u_char *src, u_char *dst, int dstsiz,
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const u_char **dnptrs, const u_char **lastdnptr)
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{
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u_char *dstp;
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const u_char **cpp, **lpp, *eob, *msg;
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const u_char *srcp;
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int n, l, first = 1;
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srcp = src;
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dstp = dst;
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eob = dstp + dstsiz;
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lpp = cpp = NULL;
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if (dnptrs != NULL) {
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if ((msg = *dnptrs++) != NULL) {
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for (cpp = dnptrs; *cpp != NULL; cpp++)
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(void)NULL;
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lpp = cpp; /*%< end of list to search */
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}
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} else
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msg = NULL;
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|
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/* make sure the domain we are about to add is legal */
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l = 0;
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do {
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int l0;
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n = *srcp;
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if ((n & NS_CMPRSFLGS) == NS_CMPRSFLGS) {
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__set_errno (EMSGSIZE);
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return (-1);
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}
|
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if ((l0 = labellen(srcp)) < 0) {
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__set_errno (EINVAL);
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return(-1);
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}
|
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l += l0 + 1;
|
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if (l > MAXCDNAME) {
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__set_errno (EMSGSIZE);
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return (-1);
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}
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srcp += l0 + 1;
|
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} while (n != 0);
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|
|
/* from here on we need to reset compression pointer array on error */
|
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srcp = src;
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do {
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/* Look to see if we can use pointers. */
|
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n = *srcp;
|
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if (n != 0 && msg != NULL) {
|
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l = dn_find(srcp, msg, (const u_char * const *)dnptrs,
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(const u_char * const *)lpp);
|
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if (l >= 0) {
|
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if (dstp + 1 >= eob) {
|
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goto cleanup;
|
|
}
|
|
*dstp++ = (l >> 8) | NS_CMPRSFLGS;
|
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*dstp++ = l % 256;
|
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return (dstp - dst);
|
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}
|
|
/* Not found, save it. */
|
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if (lastdnptr != NULL && cpp < lastdnptr - 1 &&
|
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(dstp - msg) < 0x4000 && first) {
|
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*cpp++ = dstp;
|
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*cpp = NULL;
|
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first = 0;
|
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}
|
|
}
|
|
/* copy label to buffer */
|
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if ((n & NS_CMPRSFLGS) == NS_CMPRSFLGS) {
|
|
/* Should not happen. */
|
|
goto cleanup;
|
|
}
|
|
n = labellen(srcp);
|
|
if (n + 1 > eob - dstp) {
|
|
goto cleanup;
|
|
}
|
|
memcpy(dstp, srcp, n + 1);
|
|
srcp += n + 1;
|
|
dstp += n + 1;
|
|
} while (n != 0);
|
|
|
|
if (dstp > eob) {
|
|
cleanup:
|
|
if (msg != NULL)
|
|
*lpp = NULL;
|
|
__set_errno (EMSGSIZE);
|
|
return (-1);
|
|
}
|
|
return (dstp - dst);
|
|
}
|
|
libresolv_hidden_def (ns_name_pack)
|
|
|
|
/*%
|
|
* Expand compressed domain name to presentation format.
|
|
*
|
|
* return:
|
|
*\li Number of bytes read out of `src', or -1 (with errno set).
|
|
*
|
|
* note:
|
|
*\li Root domain returns as "." not "".
|
|
*/
|
|
int
|
|
ns_name_uncompress(const u_char *msg, const u_char *eom, const u_char *src,
|
|
char *dst, size_t dstsiz)
|
|
{
|
|
u_char tmp[NS_MAXCDNAME];
|
|
int n;
|
|
|
|
if ((n = ns_name_unpack(msg, eom, src, tmp, sizeof tmp)) == -1)
|
|
return (-1);
|
|
if (ns_name_ntop(tmp, dst, dstsiz) == -1)
|
|
return (-1);
|
|
return (n);
|
|
}
|
|
libresolv_hidden_def (ns_name_uncompress)
|
|
|
|
/*%
|
|
* Compress a domain name into wire format, using compression pointers.
|
|
*
|
|
* return:
|
|
*\li Number of bytes consumed in `dst' or -1 (with errno set).
|
|
*
|
|
* notes:
|
|
*\li 'dnptrs' is an array of pointers to previous compressed names.
|
|
*\li dnptrs[0] is a pointer to the beginning of the message.
|
|
*\li The list ends with NULL. 'lastdnptr' is a pointer to the end of the
|
|
* array pointed to by 'dnptrs'. Side effect is to update the list of
|
|
* pointers for labels inserted into the message as we compress the name.
|
|
*\li If 'dnptr' is NULL, we don't try to compress names. If 'lastdnptr'
|
|
* is NULL, we don't update the list.
|
|
*/
|
|
int
|
|
ns_name_compress(const char *src, u_char *dst, size_t dstsiz,
|
|
const u_char **dnptrs, const u_char **lastdnptr)
|
|
{
|
|
u_char tmp[NS_MAXCDNAME];
|
|
|
|
if (ns_name_pton(src, tmp, sizeof tmp) == -1)
|
|
return (-1);
|
|
return (ns_name_pack(tmp, dst, dstsiz, dnptrs, lastdnptr));
|
|
}
|
|
libresolv_hidden_def (ns_name_compress)
|
|
|
|
/*%
|
|
* Reset dnptrs so that there are no active references to pointers at or
|
|
* after src.
|
|
*/
|
|
void
|
|
ns_name_rollback(const u_char *src, const u_char **dnptrs,
|
|
const u_char **lastdnptr)
|
|
{
|
|
while (dnptrs < lastdnptr && *dnptrs != NULL) {
|
|
if (*dnptrs >= src) {
|
|
*dnptrs = NULL;
|
|
break;
|
|
}
|
|
dnptrs++;
|
|
}
|
|
}
|
|
|
|
/*%
|
|
* Advance *ptrptr to skip over the compressed name it points at.
|
|
*
|
|
* return:
|
|
*\li 0 on success, -1 (with errno set) on failure.
|
|
*/
|
|
int
|
|
ns_name_skip(const u_char **ptrptr, const u_char *eom)
|
|
{
|
|
const u_char *cp;
|
|
u_int n;
|
|
|
|
cp = *ptrptr;
|
|
while (cp < eom && (n = *cp++) != 0) {
|
|
/* Check for indirection. */
|
|
switch (n & NS_CMPRSFLGS) {
|
|
case 0: /*%< normal case, n == len */
|
|
cp += n;
|
|
continue;
|
|
case NS_CMPRSFLGS: /*%< indirection */
|
|
cp++;
|
|
break;
|
|
default: /*%< illegal type */
|
|
__set_errno (EMSGSIZE);
|
|
return (-1);
|
|
}
|
|
break;
|
|
}
|
|
if (cp > eom) {
|
|
__set_errno (EMSGSIZE);
|
|
return (-1);
|
|
}
|
|
*ptrptr = cp;
|
|
return (0);
|
|
}
|
|
libresolv_hidden_def (ns_name_skip)
|
|
|
|
/* Private. */
|
|
|
|
/*%
|
|
* Thinking in noninternationalized USASCII (per the DNS spec),
|
|
* is this character special ("in need of quoting") ?
|
|
*
|
|
* return:
|
|
*\li boolean.
|
|
*/
|
|
static int
|
|
special(int ch) {
|
|
switch (ch) {
|
|
case 0x22: /*%< '"' */
|
|
case 0x2E: /*%< '.' */
|
|
case 0x3B: /*%< ';' */
|
|
case 0x5C: /*%< '\\' */
|
|
case 0x28: /*%< '(' */
|
|
case 0x29: /*%< ')' */
|
|
/* Special modifiers in zone files. */
|
|
case 0x40: /*%< '@' */
|
|
case 0x24: /*%< '$' */
|
|
return (1);
|
|
default:
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
/*%
|
|
* Thinking in noninternationalized USASCII (per the DNS spec),
|
|
* is this character visible and not a space when printed ?
|
|
*
|
|
* return:
|
|
*\li boolean.
|
|
*/
|
|
static int
|
|
printable(int ch) {
|
|
return (ch > 0x20 && ch < 0x7f);
|
|
}
|
|
|
|
/*%
|
|
* Thinking in noninternationalized USASCII (per the DNS spec),
|
|
* convert this character to lower case if it's upper case.
|
|
*/
|
|
static int
|
|
mklower(int ch) {
|
|
if (ch >= 0x41 && ch <= 0x5A)
|
|
return (ch + 0x20);
|
|
return (ch);
|
|
}
|
|
|
|
/*%
|
|
* Search for the counted-label name in an array of compressed names.
|
|
*
|
|
* return:
|
|
*\li offset from msg if found, or -1.
|
|
*
|
|
* notes:
|
|
*\li dnptrs is the pointer to the first name on the list,
|
|
*\li not the pointer to the start of the message.
|
|
*/
|
|
static int
|
|
dn_find(const u_char *domain, const u_char *msg,
|
|
const u_char * const *dnptrs,
|
|
const u_char * const *lastdnptr)
|
|
{
|
|
const u_char *dn, *cp, *sp;
|
|
const u_char * const *cpp;
|
|
u_int n;
|
|
|
|
for (cpp = dnptrs; cpp < lastdnptr; cpp++) {
|
|
sp = *cpp;
|
|
/*
|
|
* terminate search on:
|
|
* root label
|
|
* compression pointer
|
|
* unusable offset
|
|
*/
|
|
while (*sp != 0 && (*sp & NS_CMPRSFLGS) == 0 &&
|
|
(sp - msg) < 0x4000) {
|
|
dn = domain;
|
|
cp = sp;
|
|
while ((n = *cp++) != 0) {
|
|
/*
|
|
* check for indirection
|
|
*/
|
|
switch (n & NS_CMPRSFLGS) {
|
|
case 0: /*%< normal case, n == len */
|
|
n = labellen(cp - 1); /*%< XXX */
|
|
if (n != *dn++)
|
|
goto next;
|
|
|
|
for ((void)NULL; n > 0; n--)
|
|
if (mklower(*dn++) !=
|
|
mklower(*cp++))
|
|
goto next;
|
|
/* Is next root for both ? */
|
|
if (*dn == '\0' && *cp == '\0')
|
|
return (sp - msg);
|
|
if (*dn)
|
|
continue;
|
|
goto next;
|
|
case NS_CMPRSFLGS: /*%< indirection */
|
|
cp = msg + (((n & 0x3f) << 8) | *cp);
|
|
break;
|
|
|
|
default: /*%< illegal type */
|
|
__set_errno (EMSGSIZE);
|
|
return (-1);
|
|
}
|
|
}
|
|
next: ;
|
|
sp += *sp + 1;
|
|
}
|
|
}
|
|
__set_errno (ENOENT);
|
|
return (-1);
|
|
}
|
|
|
|
/* Return the length of the encoded label starting at LP, or -1 for
|
|
compression references and extended label types. */
|
|
static int
|
|
labellen (const unsigned char *lp)
|
|
{
|
|
if (*lp <= 63)
|
|
return *lp;
|
|
return -1;
|
|
}
|
|
|
|
/*! \file */
|