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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [libc/] [res_comp.c] - Blame information for rev 173

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/*
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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 1.2 2001-09-27 12:01:53 chris 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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