122 lines
2.6 KiB
C
122 lines
2.6 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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/* Forward. */
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static int labellen(const u_char *);
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/* Public. */
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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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* Reset dnptrs so that there are no active references to pointers at or
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* after src.
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*/
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void
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ns_name_rollback(const u_char *src, const u_char **dnptrs,
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const u_char **lastdnptr)
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{
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while (dnptrs < lastdnptr && *dnptrs != NULL) {
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if (*dnptrs >= src) {
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*dnptrs = NULL;
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break;
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}
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dnptrs++;
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}
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}
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/* Private. */
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/* Return the length of the encoded label starting at LP, or -1 for
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compression references and extended label types. */
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static int
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labellen (const unsigned char *lp)
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{
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if (*lp <= 63)
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return *lp;
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return -1;
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}
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/*! \file */
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