2
* Copyright (c) 1985, 1993
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* The Regents of the University of California. All rights reserved.
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* Redistribution and use in source and binary forms, with or without
6
* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* Portions Copyright (c) 1993 by Digital Equipment Corporation.
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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, and that
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* the name of Digital Equipment Corporation not be used in advertising or
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* publicity pertaining to distribution of the document or software without
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* specific, written prior permission.
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* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
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* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
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* CORPORATION 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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* Portions Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
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* Portions Copyright (c) 1996-2003 by Internet Software Consortium
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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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* 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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* Internet Systems Consortium, Inc.
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* Redwood City, CA 94063
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#if defined(LIBC_SCCS) && !defined(lint)
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static const char sccsid[] = "@(#)res_comp.c 8.1 (Berkeley) 6/4/93";
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static const char rcsid[] = "$Id: res_comp.c,v 1.3 2005/03/17 20:15:18 dhankins Exp $";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <sys/param.h>
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#include <netinet/in.h>
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#include <sys/socket.h>
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#include "minires/minires.h"
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#include "arpa/nameser.h"
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* Expand compressed domain name 'comp_dn' to full domain name.
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* 'msg' is a pointer to the begining of the message,
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* 'eomorig' points to the first location after the message,
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* 'exp_dn' is a pointer to a buffer of size 'length' for the result.
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* Return size of compressed name or -1 if there was an error.
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dn_expand(const u_char *msg, const u_char *eom, const u_char *src,
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char *dst, unsigned dstsiz)
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int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz);
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if (n > 0 && dst[0] == '.')
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* Pack domain name 'exp_dn' in presentation form into 'comp_dn'.
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* Return the size of the compressed name or -1.
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* 'length' is the size of the array pointed to by 'comp_dn'.
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dn_comp(const char *src, u_char *dst, unsigned dstsiz,
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u_char **dnptrs, u_char **lastdnptr)
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return (ns_name_compress(src, dst, (size_t)dstsiz,
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(const u_char **)dnptrs,
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(const u_char **)lastdnptr));
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* Skip over a compressed domain name. Return the size or -1.
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dn_skipname(const u_char *ptr, const u_char *eom) {
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const u_char *saveptr = ptr;
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if (ns_name_skip(&ptr, eom) == -1)
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return (ptr - saveptr);
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* Verify that a domain name uses an acceptable character set.
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* Note the conspicuous absence of ctype macros in these definitions. On
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* non-ASCII hosts, we can't depend on string literals or ctype macros to
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* tell us anything about network-format data. The rest of the BIND system
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* is not careful about this, but for some reason, we're doing it right here.
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#define hyphenchar(c) ((c) == 0x2d)
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#define bslashchar(c) ((c) == 0x5c)
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#define periodchar(c) ((c) == PERIOD)
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#define asterchar(c) ((c) == 0x2a)
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#define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \
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|| ((c) >= 0x61 && (c) <= 0x7a))
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#define digitchar(c) ((c) >= 0x30 && (c) <= 0x39)
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#define borderchar(c) (alphachar(c) || digitchar(c))
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#define middlechar(c) (borderchar(c) || hyphenchar(c))
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#define domainchar(c) ((c) > 0x20 && (c) < 0x7f)
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res_hnok(const char *dn) {
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int ppch = '\0', pch = PERIOD, ch = *dn++;
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if (periodchar(ch)) {
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} else if (periodchar(pch)) {
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} else if (periodchar(nch) || nch == '\0') {
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ppch = pch, pch = ch, ch = nch;
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* hostname-like (A, MX, WKS) owners can have "*" as their first label
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* but must otherwise be as a host name.
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res_ownok(const char *dn) {
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if (asterchar(dn[0])) {
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if (periodchar(dn[1]))
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return (res_hnok(dn+2));
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return (res_hnok(dn));
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* SOA RNAMEs and RP RNAMEs can have any printable character in their first
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* label, but the rest of the name has to look like a host name.
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res_mailok(const char *dn) {
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/* "." is a valid missing representation */
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/* otherwise <label>.<hostname> */
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while ((ch = *dn++) != '\0') {
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if (!escaped && periodchar(ch))
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else if (bslashchar(ch))
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return (res_hnok(dn));
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* This function is quite liberal, since RFC 1034's character sets are only
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res_dnok(const char *dn) {
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while ((ch = *dn++) != '\0')
added
removed
minires/res_comp.c
