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Annotation of src/lib/libc/resolv/res_comp.c, Revision 1.9.14.1

1.9.14.1! riz         1: /*     $NetBSD: res_comp.c,v 1.10 2009/04/12 17:07:17 christos Exp $   */
1.1       christos    2:
                      3: /*
                      4:  * Copyright (c) 1985, 1993
                      5:  *    The Regents of the University of California.  All rights reserved.
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. All advertising materials mentioning features or use of this software
                     16:  *    must display the following acknowledgement:
                     17:  *     This product includes software developed by the University of
                     18:  *     California, Berkeley and its contributors.
                     19:  * 4. Neither the name of the University nor the names of its contributors
                     20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  */
                     35:
                     36: /*
                     37:  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
                     38:  *
                     39:  * Permission to use, copy, modify, and distribute this software for any
                     40:  * purpose with or without fee is hereby granted, provided that the above
                     41:  * copyright notice and this permission notice appear in all copies, and that
                     42:  * the name of Digital Equipment Corporation not be used in advertising or
                     43:  * publicity pertaining to distribution of the document or software without
                     44:  * specific, written prior permission.
                     45:  *
                     46:  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
                     47:  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
                     48:  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
                     49:  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
                     50:  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
                     51:  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
                     52:  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
                     53:  * SOFTWARE.
                     54:  */
                     55:
                     56: /*
                     57:  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
                     58:  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
                     59:  *
                     60:  * Permission to use, copy, modify, and distribute this software for any
                     61:  * purpose with or without fee is hereby granted, provided that the above
                     62:  * copyright notice and this permission notice appear in all copies.
                     63:  *
                     64:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
                     65:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     66:  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
                     67:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     68:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     69:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
                     70:  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     71:  */
1.3       christos   72: #include <sys/cdefs.h>
1.1       christos   73: #if defined(LIBC_SCCS) && !defined(lint)
1.3       christos   74: #ifdef notdef
1.1       christos   75: static const char sccsid[] = "@(#)res_comp.c   8.1 (Berkeley) 6/4/93";
1.9       christos   76: static const char rcsid[] = "Id: res_comp.c,v 1.5 2005/07/28 06:51:50 marka Exp";
1.3       christos   77: #else
1.9.14.1! riz        78: __RCSID("$NetBSD: res_comp.c,v 1.10 2009/04/12 17:07:17 christos Exp $");
1.3       christos   79: #endif
1.1       christos   80: #endif /* LIBC_SCCS and not lint */
                     81:
                     82: #include "port_before.h"
1.4       christos   83:
                     84: #include "namespace.h"
1.1       christos   85: #include <sys/types.h>
                     86: #include <sys/param.h>
                     87: #include <netinet/in.h>
                     88: #include <arpa/nameser.h>
                     89: #include <ctype.h>
                     90: #include <resolv.h>
                     91: #include <stdio.h>
                     92: #include <string.h>
                     93: #include <unistd.h>
                     94: #include "port_after.h"
                     95:
1.4       christos   96: #ifdef __weak_alias
                     97: __weak_alias(dn_expand,_dn_expand)
                     98: __weak_alias(dn_comp,__dn_comp)
1.6       christos   99: #if 0
1.4       christos  100: __weak_alias(dn_skipname,__dn_skipname)
                    101: __weak_alias(res_hnok,__res_hnok)
                    102: __weak_alias(res_ownok,__res_ownok)
                    103: __weak_alias(res_mailok,__res_mailok)
                    104: __weak_alias(res_dnok,__res_dnok)
                    105: #endif
1.5       christos  106: #endif
1.4       christos  107:
1.7       christos  108: /*%
1.1       christos  109:  * Expand compressed domain name 'src' to full domain name.
1.7       christos  110:  *
                    111:  * \li 'msg' is a pointer to the begining of the message,
                    112:  * \li 'eom' points to the first location after the message,
                    113:  * \li 'dst' is a pointer to a buffer of size 'dstsiz' for the result.
                    114:  * \li Return size of compressed name or -1 if there was an error.
1.1       christos  115:  */
                    116: int
                    117: dn_expand(const u_char *msg, const u_char *eom, const u_char *src,
                    118:          char *dst, int dstsiz)
                    119: {
                    120:        int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz);
                    121:
                    122:        if (n > 0 && dst[0] == '.')
                    123:                dst[0] = '\0';
                    124:        return (n);
                    125: }
                    126:
1.7       christos  127: /*%
1.1       christos  128:  * Pack domain name 'exp_dn' in presentation form into 'comp_dn'.
1.7       christos  129:  *
                    130:  * \li Return the size of the compressed name or -1.
                    131:  * \li 'length' is the size of the array pointed to by 'comp_dn'.
1.1       christos  132:  */
                    133: int
                    134: dn_comp(const char *src, u_char *dst, int dstsiz,
                    135:        u_char **dnptrs, u_char **lastdnptr)
                    136: {
                    137:        return (ns_name_compress(src, dst, (size_t)dstsiz,
                    138:                                 (const u_char **)dnptrs,
                    139:                                 (const u_char **)lastdnptr));
                    140: }
                    141:
1.7       christos  142: /*%
1.1       christos  143:  * Skip over a compressed domain name. Return the size or -1.
                    144:  */
                    145: int
                    146: dn_skipname(const u_char *ptr, const u_char *eom) {
                    147:        const u_char *saveptr = ptr;
                    148:
                    149:        if (ns_name_skip(&ptr, eom) == -1)
                    150:                return (-1);
                    151:        return (ptr - saveptr);
                    152: }
                    153:
1.7       christos  154: /*%
1.1       christos  155:  * Verify that a domain name uses an acceptable character set.
1.7       christos  156:  *
1.1       christos  157:  * Note the conspicuous absence of ctype macros in these definitions.  On
                    158:  * non-ASCII hosts, we can't depend on string literals or ctype macros to
                    159:  * tell us anything about network-format data.  The rest of the BIND system
                    160:  * is not careful about this, but for some reason, we're doing it right here.
                    161:  */
                    162: #define PERIOD 0x2e
                    163: #define        hyphenchar(c) ((c) == 0x2d)
                    164: #define bslashchar(c) ((c) == 0x5c)
                    165: #define periodchar(c) ((c) == PERIOD)
                    166: #define asterchar(c) ((c) == 0x2a)
                    167: #define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \
                    168:                   || ((c) >= 0x61 && (c) <= 0x7a))
                    169: #define digitchar(c) ((c) >= 0x30 && (c) <= 0x39)
                    170:
                    171: #define borderchar(c) (alphachar(c) || digitchar(c))
                    172: #define middlechar(c) (borderchar(c) || hyphenchar(c))
                    173: #define        domainchar(c) ((c) > 0x20 && (c) < 0x7f)
                    174:
                    175: int
                    176: res_hnok(const char *dn) {
                    177:        int pch = PERIOD, ch = *dn++;
                    178:
                    179:        while (ch != '\0') {
                    180:                int nch = *dn++;
                    181:
                    182:                if (periodchar(ch)) {
1.2       christos  183:                        ;
1.1       christos  184:                } else if (periodchar(pch)) {
                    185:                        if (!borderchar(ch))
                    186:                                return (0);
                    187:                } else if (periodchar(nch) || nch == '\0') {
                    188:                        if (!borderchar(ch))
                    189:                                return (0);
                    190:                } else {
                    191:                        if (!middlechar(ch))
                    192:                                return (0);
                    193:                }
                    194:                pch = ch, ch = nch;
                    195:        }
                    196:        return (1);
                    197: }
                    198:
1.7       christos  199: /*%
1.1       christos  200:  * hostname-like (A, MX, WKS) owners can have "*" as their first label
                    201:  * but must otherwise be as a host name.
                    202:  */
                    203: int
                    204: res_ownok(const char *dn) {
                    205:        if (asterchar(dn[0])) {
                    206:                if (periodchar(dn[1]))
                    207:                        return (res_hnok(dn+2));
                    208:                if (dn[1] == '\0')
                    209:                        return (1);
                    210:        }
                    211:        return (res_hnok(dn));
                    212: }
                    213:
1.7       christos  214: /*%
1.1       christos  215:  * SOA RNAMEs and RP RNAMEs can have any printable character in their first
                    216:  * label, but the rest of the name has to look like a host name.
                    217:  */
                    218: int
                    219: res_mailok(const char *dn) {
                    220:        int ch, escaped = 0;
                    221:
                    222:        /* "." is a valid missing representation */
                    223:        if (*dn == '\0')
                    224:                return (1);
                    225:
                    226:        /* otherwise <label>.<hostname> */
                    227:        while ((ch = *dn++) != '\0') {
                    228:                if (!domainchar(ch))
                    229:                        return (0);
                    230:                if (!escaped && periodchar(ch))
                    231:                        break;
                    232:                if (escaped)
                    233:                        escaped = 0;
                    234:                else if (bslashchar(ch))
                    235:                        escaped = 1;
                    236:        }
                    237:        if (periodchar(ch))
                    238:                return (res_hnok(dn));
                    239:        return (0);
                    240: }
                    241:
1.7       christos  242: /*%
                    243:  * This function is quite liberal, since RFC1034's character sets are only
1.1       christos  244:  * recommendations.
                    245:  */
                    246: int
                    247: res_dnok(const char *dn) {
                    248:        int ch;
                    249:
                    250:        while ((ch = *dn++) != '\0')
                    251:                if (!domainchar(ch))
                    252:                        return (0);
                    253:        return (1);
                    254: }
                    255:
                    256: #ifdef BIND_4_COMPAT
1.7       christos  257: /*%
1.1       christos  258:  * This module must export the following externally-visible symbols:
                    259:  *     ___putlong
                    260:  *     ___putshort
                    261:  *     __getlong
                    262:  *     __getshort
                    263:  * Note that one _ comes from C and the others come from us.
                    264:  */
1.7       christos  265:
                    266: #ifdef SOLARIS2
                    267: #ifdef  __putlong
                    268: #undef  __putlong
                    269: #endif
                    270: #ifdef  __putshort
                    271: #undef  __putshort
                    272: #endif
                    273: #pragma weak    putlong         =       __putlong
                    274: #pragma weak    putshort        =       __putshort
                    275: #endif /* SOLARIS2 */
                    276:
1.1       christos  277: void __putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); }
                    278: void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); }
                    279: #ifndef __ultrix__
                    280: u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); }
                    281: u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); }
                    282: #endif /*__ultrix__*/
                    283: #endif /*BIND_4_COMPAT*/
1.7       christos  284:
                    285: /*! \file */

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