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Annotation of src/lib/libc/resolv/res_comp.c, Revision 1.12

1.12    ! christos    1: /*     $NetBSD: res_comp.c,v 1.11 2011/08/17 09:53:53 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
1.12    ! christos   78: __RCSID("$NetBSD: res_comp.c,v 1.11 2011/08/17 09:53:53 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>
1.12    ! christos   89: #include <assert.h>
1.1       christos   90: #include <ctype.h>
                     91: #include <resolv.h>
                     92: #include <stdio.h>
                     93: #include <string.h>
                     94: #include <unistd.h>
                     95: #include "port_after.h"
                     96:
1.4       christos   97: #ifdef __weak_alias
                     98: __weak_alias(dn_expand,_dn_expand)
                     99: __weak_alias(dn_comp,__dn_comp)
1.6       christos  100: #if 0
1.4       christos  101: __weak_alias(dn_skipname,__dn_skipname)
                    102: __weak_alias(res_hnok,__res_hnok)
                    103: __weak_alias(res_ownok,__res_ownok)
                    104: __weak_alias(res_mailok,__res_mailok)
                    105: __weak_alias(res_dnok,__res_dnok)
                    106: #endif
1.5       christos  107: #endif
1.4       christos  108:
1.7       christos  109: /*%
1.1       christos  110:  * Expand compressed domain name 'src' to full domain name.
1.7       christos  111:  *
                    112:  * \li 'msg' is a pointer to the begining of the message,
                    113:  * \li 'eom' points to the first location after the message,
                    114:  * \li 'dst' is a pointer to a buffer of size 'dstsiz' for the result.
                    115:  * \li Return size of compressed name or -1 if there was an error.
1.1       christos  116:  */
                    117: int
                    118: dn_expand(const u_char *msg, const u_char *eom, const u_char *src,
                    119:          char *dst, int dstsiz)
                    120: {
                    121:        int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz);
                    122:
                    123:        if (n > 0 && dst[0] == '.')
                    124:                dst[0] = '\0';
                    125:        return (n);
                    126: }
                    127:
1.7       christos  128: /*%
1.1       christos  129:  * Pack domain name 'exp_dn' in presentation form into 'comp_dn'.
1.7       christos  130:  *
                    131:  * \li Return the size of the compressed name or -1.
                    132:  * \li 'length' is the size of the array pointed to by 'comp_dn'.
1.1       christos  133:  */
                    134: int
                    135: dn_comp(const char *src, u_char *dst, int dstsiz,
                    136:        u_char **dnptrs, u_char **lastdnptr)
                    137: {
                    138:        return (ns_name_compress(src, dst, (size_t)dstsiz,
1.11      christos  139:                                 (void *)dnptrs,
                    140:                                 (void *)lastdnptr));
1.1       christos  141: }
                    142:
1.7       christos  143: /*%
1.1       christos  144:  * Skip over a compressed domain name. Return the size or -1.
                    145:  */
                    146: int
                    147: dn_skipname(const u_char *ptr, const u_char *eom) {
                    148:        const u_char *saveptr = ptr;
                    149:
                    150:        if (ns_name_skip(&ptr, eom) == -1)
                    151:                return (-1);
1.12    ! christos  152:        _DIAGASSERT(__type_fit(int, ptr - saveptr));
        !           153:        return (int)(ptr - saveptr);
1.1       christos  154: }
                    155:
1.7       christos  156: /*%
1.1       christos  157:  * Verify that a domain name uses an acceptable character set.
1.7       christos  158:  *
1.1       christos  159:  * Note the conspicuous absence of ctype macros in these definitions.  On
                    160:  * non-ASCII hosts, we can't depend on string literals or ctype macros to
                    161:  * tell us anything about network-format data.  The rest of the BIND system
                    162:  * is not careful about this, but for some reason, we're doing it right here.
                    163:  */
                    164: #define PERIOD 0x2e
                    165: #define        hyphenchar(c) ((c) == 0x2d)
                    166: #define bslashchar(c) ((c) == 0x5c)
                    167: #define periodchar(c) ((c) == PERIOD)
                    168: #define asterchar(c) ((c) == 0x2a)
                    169: #define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \
                    170:                   || ((c) >= 0x61 && (c) <= 0x7a))
                    171: #define digitchar(c) ((c) >= 0x30 && (c) <= 0x39)
                    172:
                    173: #define borderchar(c) (alphachar(c) || digitchar(c))
                    174: #define middlechar(c) (borderchar(c) || hyphenchar(c))
                    175: #define        domainchar(c) ((c) > 0x20 && (c) < 0x7f)
                    176:
                    177: int
                    178: res_hnok(const char *dn) {
                    179:        int pch = PERIOD, ch = *dn++;
                    180:
                    181:        while (ch != '\0') {
                    182:                int nch = *dn++;
                    183:
                    184:                if (periodchar(ch)) {
1.2       christos  185:                        ;
1.1       christos  186:                } else if (periodchar(pch)) {
                    187:                        if (!borderchar(ch))
                    188:                                return (0);
                    189:                } else if (periodchar(nch) || nch == '\0') {
                    190:                        if (!borderchar(ch))
                    191:                                return (0);
                    192:                } else {
                    193:                        if (!middlechar(ch))
                    194:                                return (0);
                    195:                }
                    196:                pch = ch, ch = nch;
                    197:        }
                    198:        return (1);
                    199: }
                    200:
1.7       christos  201: /*%
1.1       christos  202:  * hostname-like (A, MX, WKS) owners can have "*" as their first label
                    203:  * but must otherwise be as a host name.
                    204:  */
                    205: int
                    206: res_ownok(const char *dn) {
                    207:        if (asterchar(dn[0])) {
                    208:                if (periodchar(dn[1]))
                    209:                        return (res_hnok(dn+2));
                    210:                if (dn[1] == '\0')
                    211:                        return (1);
                    212:        }
                    213:        return (res_hnok(dn));
                    214: }
                    215:
1.7       christos  216: /*%
1.1       christos  217:  * SOA RNAMEs and RP RNAMEs can have any printable character in their first
                    218:  * label, but the rest of the name has to look like a host name.
                    219:  */
                    220: int
                    221: res_mailok(const char *dn) {
                    222:        int ch, escaped = 0;
                    223:
                    224:        /* "." is a valid missing representation */
                    225:        if (*dn == '\0')
                    226:                return (1);
                    227:
                    228:        /* otherwise <label>.<hostname> */
                    229:        while ((ch = *dn++) != '\0') {
                    230:                if (!domainchar(ch))
                    231:                        return (0);
                    232:                if (!escaped && periodchar(ch))
                    233:                        break;
                    234:                if (escaped)
                    235:                        escaped = 0;
                    236:                else if (bslashchar(ch))
                    237:                        escaped = 1;
                    238:        }
                    239:        if (periodchar(ch))
                    240:                return (res_hnok(dn));
                    241:        return (0);
                    242: }
                    243:
1.7       christos  244: /*%
                    245:  * This function is quite liberal, since RFC1034's character sets are only
1.1       christos  246:  * recommendations.
                    247:  */
                    248: int
                    249: res_dnok(const char *dn) {
                    250:        int ch;
                    251:
                    252:        while ((ch = *dn++) != '\0')
                    253:                if (!domainchar(ch))
                    254:                        return (0);
                    255:        return (1);
                    256: }
                    257:
                    258: #ifdef BIND_4_COMPAT
1.7       christos  259: /*%
1.1       christos  260:  * This module must export the following externally-visible symbols:
                    261:  *     ___putlong
                    262:  *     ___putshort
                    263:  *     __getlong
                    264:  *     __getshort
                    265:  * Note that one _ comes from C and the others come from us.
                    266:  */
1.7       christos  267:
                    268: #ifdef SOLARIS2
                    269: #ifdef  __putlong
                    270: #undef  __putlong
                    271: #endif
                    272: #ifdef  __putshort
                    273: #undef  __putshort
                    274: #endif
                    275: #pragma weak    putlong         =       __putlong
                    276: #pragma weak    putshort        =       __putshort
                    277: #endif /* SOLARIS2 */
                    278:
1.1       christos  279: void __putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); }
                    280: void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); }
                    281: #ifndef __ultrix__
                    282: u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); }
                    283: u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); }
                    284: #endif /*__ultrix__*/
                    285: #endif /*BIND_4_COMPAT*/
1.7       christos  286:
                    287: /*! \file */

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