cb690d1f0b
and res_* modules in a way that works for ELF. I moved the aliases out of res_stubs.c and into the individual modules where the entry points are defined. Weak aliases don't work in ELF unless that is the case. (Actually, I'm surprised it worked for a.out.) This should fix the undefined "inet_addr" and related symbols in various applications that fail to include <arpa/inet.h> or <resolv.h> as they are supposed to do.
268 lines
8.4 KiB
C
268 lines
8.4 KiB
C
/*
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* Copyright (c) 1985, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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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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*
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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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* SUCH DAMAGE.
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*/
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/*
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* Portions Copyright (c) 1993 by Digital Equipment Corporation.
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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, 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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*
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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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* SOFTWARE.
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*/
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/*
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* Portions Copyright (c) 1996 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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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)res_comp.c 8.1 (Berkeley) 6/4/93";
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static char orig_rcsid[] = "From: Id: res_comp.c,v 8.11 1997/05/21 19:31:04 halley Exp $";
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static char rcsid[] = "$Id: res_comp.c,v 1.14 1998/06/11 09:02:46 peter 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 <arpa/nameser.h>
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#include <ctype.h>
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#include <resolv.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#define BIND_4_COMPAT
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/*
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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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*/
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int
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dn_expand(const u_char *msg, const u_char *eom, const u_char *src,
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char *dst, int dstsiz)
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{
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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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dst[0] = '\0';
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return (n);
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}
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/*
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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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*/
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int
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dn_comp(const char *src, u_char *dst, int dstsiz,
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u_char **dnptrs, u_char **lastdnptr)
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{
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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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}
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/*
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* Skip over a compressed domain name. Return the size or -1.
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*/
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int
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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 (-1);
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return (ptr - saveptr);
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}
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/*
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* Verify that a domain name uses an acceptable character set.
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*/
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/*
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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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*/
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#define PERIOD 0x2e
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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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int
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res_hnok(dn)
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const char *dn;
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{
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int ppch = '\0', pch = PERIOD, ch = *dn++;
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while (ch != '\0') {
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int nch = *dn++;
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if (periodchar(ch)) {
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(void)NULL;
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} else if (periodchar(pch)) {
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if (!borderchar(ch))
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return (0);
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} else if (periodchar(nch) || nch == '\0') {
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if (!borderchar(ch))
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return (0);
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} else {
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if (!middlechar(ch))
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return (0);
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}
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ppch = pch, pch = ch, ch = nch;
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}
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return (1);
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}
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/*
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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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*/
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int
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res_ownok(dn)
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const char *dn;
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{
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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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if (dn[1] == '\0')
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return (1);
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}
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return (res_hnok(dn));
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}
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/*
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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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*/
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int
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res_mailok(dn)
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const char *dn;
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{
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int ch, escaped = 0;
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/* "." is a valid missing representation */
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if (*dn == '\0')
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return (1);
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/* otherwise <label>.<hostname> */
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while ((ch = *dn++) != '\0') {
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if (!domainchar(ch))
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return (0);
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if (!escaped && periodchar(ch))
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break;
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if (escaped)
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escaped = 0;
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else if (bslashchar(ch))
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escaped = 1;
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}
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if (periodchar(ch))
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return (res_hnok(dn));
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return (0);
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}
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/*
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* This function is quite liberal, since RFC 1034's character sets are only
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* recommendations.
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*/
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int
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res_dnok(dn)
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const char *dn;
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{
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int ch;
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while ((ch = *dn++) != '\0')
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if (!domainchar(ch))
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return (0);
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return (1);
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}
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#ifdef BIND_4_COMPAT
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/*
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* This module must export the following externally-visible symbols:
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* ___putlong
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* ___putshort
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* __getlong
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* __getshort
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* Note that one _ comes from C and the others come from us.
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*/
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void __putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); }
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void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); }
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u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); }
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u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); }
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#endif /*BIND_4_COMPAT*/
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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 <resolv.h>.
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*/
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#undef dn_comp
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__weak_reference(__dn_comp, dn_comp);
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#undef dn_expand
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__weak_reference(__dn_expand, dn_expand);
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