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Annotation of src/lib/libc/resolv/res_comp.c, Revision 1.13

1.13    ! christos    1: /*     $NetBSD: res_comp.c,v 1.12 2012/03/13 21:13:43 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.
1.13    ! christos   15:  * 3. Neither the name of the University nor the names of its contributors
1.1       christos   16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
                     31:
                     32: /*
                     33:  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
                     34:  *
                     35:  * Permission to use, copy, modify, and distribute this software for any
                     36:  * purpose with or without fee is hereby granted, provided that the above
                     37:  * copyright notice and this permission notice appear in all copies, and that
                     38:  * the name of Digital Equipment Corporation not be used in advertising or
                     39:  * publicity pertaining to distribution of the document or software without
                     40:  * specific, written prior permission.
                     41:  *
                     42:  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
                     43:  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
                     44:  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
                     45:  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
                     46:  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
                     47:  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
                     48:  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
                     49:  * SOFTWARE.
                     50:  */
                     51:
                     52: /*
                     53:  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
                     54:  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
                     55:  *
                     56:  * Permission to use, copy, modify, and distribute this software for any
                     57:  * purpose with or without fee is hereby granted, provided that the above
                     58:  * copyright notice and this permission notice appear in all copies.
                     59:  *
                     60:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
                     61:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     62:  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
                     63:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     64:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     65:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
                     66:  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     67:  */
1.3       christos   68: #include <sys/cdefs.h>
1.1       christos   69: #if defined(LIBC_SCCS) && !defined(lint)
1.3       christos   70: #ifdef notdef
1.1       christos   71: static const char sccsid[] = "@(#)res_comp.c   8.1 (Berkeley) 6/4/93";
1.9       christos   72: static const char rcsid[] = "Id: res_comp.c,v 1.5 2005/07/28 06:51:50 marka Exp";
1.3       christos   73: #else
1.13    ! christos   74: __RCSID("$NetBSD: res_comp.c,v 1.12 2012/03/13 21:13:43 christos Exp $");
1.3       christos   75: #endif
1.1       christos   76: #endif /* LIBC_SCCS and not lint */
                     77:
                     78: #include "port_before.h"
1.4       christos   79:
                     80: #include "namespace.h"
1.1       christos   81: #include <sys/types.h>
                     82: #include <sys/param.h>
                     83: #include <netinet/in.h>
                     84: #include <arpa/nameser.h>
1.12      christos   85: #include <assert.h>
1.1       christos   86: #include <ctype.h>
                     87: #include <resolv.h>
                     88: #include <stdio.h>
                     89: #include <string.h>
                     90: #include <unistd.h>
                     91: #include "port_after.h"
                     92:
1.4       christos   93: #ifdef __weak_alias
                     94: __weak_alias(dn_expand,_dn_expand)
                     95: __weak_alias(dn_comp,__dn_comp)
1.6       christos   96: #if 0
1.4       christos   97: __weak_alias(dn_skipname,__dn_skipname)
                     98: __weak_alias(res_hnok,__res_hnok)
                     99: __weak_alias(res_ownok,__res_ownok)
                    100: __weak_alias(res_mailok,__res_mailok)
                    101: __weak_alias(res_dnok,__res_dnok)
                    102: #endif
1.5       christos  103: #endif
1.4       christos  104:
1.7       christos  105: /*%
1.1       christos  106:  * Expand compressed domain name 'src' to full domain name.
1.7       christos  107:  *
                    108:  * \li 'msg' is a pointer to the begining of the message,
                    109:  * \li 'eom' points to the first location after the message,
                    110:  * \li 'dst' is a pointer to a buffer of size 'dstsiz' for the result.
                    111:  * \li Return size of compressed name or -1 if there was an error.
1.1       christos  112:  */
                    113: int
                    114: dn_expand(const u_char *msg, const u_char *eom, const u_char *src,
                    115:          char *dst, int dstsiz)
                    116: {
                    117:        int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz);
                    118:
                    119:        if (n > 0 && dst[0] == '.')
                    120:                dst[0] = '\0';
                    121:        return (n);
                    122: }
                    123:
1.7       christos  124: /*%
1.1       christos  125:  * Pack domain name 'exp_dn' in presentation form into 'comp_dn'.
1.7       christos  126:  *
                    127:  * \li Return the size of the compressed name or -1.
                    128:  * \li 'length' is the size of the array pointed to by 'comp_dn'.
1.1       christos  129:  */
                    130: int
                    131: dn_comp(const char *src, u_char *dst, int dstsiz,
                    132:        u_char **dnptrs, u_char **lastdnptr)
                    133: {
                    134:        return (ns_name_compress(src, dst, (size_t)dstsiz,
1.11      christos  135:                                 (void *)dnptrs,
                    136:                                 (void *)lastdnptr));
1.1       christos  137: }
                    138:
1.7       christos  139: /*%
1.1       christos  140:  * Skip over a compressed domain name. Return the size or -1.
                    141:  */
                    142: int
                    143: dn_skipname(const u_char *ptr, const u_char *eom) {
                    144:        const u_char *saveptr = ptr;
                    145:
                    146:        if (ns_name_skip(&ptr, eom) == -1)
                    147:                return (-1);
1.12      christos  148:        _DIAGASSERT(__type_fit(int, ptr - saveptr));
                    149:        return (int)(ptr - saveptr);
1.1       christos  150: }
                    151:
1.7       christos  152: /*%
1.1       christos  153:  * Verify that a domain name uses an acceptable character set.
1.7       christos  154:  *
1.1       christos  155:  * Note the conspicuous absence of ctype macros in these definitions.  On
                    156:  * non-ASCII hosts, we can't depend on string literals or ctype macros to
                    157:  * tell us anything about network-format data.  The rest of the BIND system
                    158:  * is not careful about this, but for some reason, we're doing it right here.
                    159:  */
                    160: #define PERIOD 0x2e
                    161: #define        hyphenchar(c) ((c) == 0x2d)
                    162: #define bslashchar(c) ((c) == 0x5c)
                    163: #define periodchar(c) ((c) == PERIOD)
                    164: #define asterchar(c) ((c) == 0x2a)
                    165: #define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \
                    166:                   || ((c) >= 0x61 && (c) <= 0x7a))
                    167: #define digitchar(c) ((c) >= 0x30 && (c) <= 0x39)
                    168:
                    169: #define borderchar(c) (alphachar(c) || digitchar(c))
                    170: #define middlechar(c) (borderchar(c) || hyphenchar(c))
                    171: #define        domainchar(c) ((c) > 0x20 && (c) < 0x7f)
                    172:
                    173: int
                    174: res_hnok(const char *dn) {
                    175:        int pch = PERIOD, ch = *dn++;
                    176:
                    177:        while (ch != '\0') {
                    178:                int nch = *dn++;
                    179:
                    180:                if (periodchar(ch)) {
1.2       christos  181:                        ;
1.1       christos  182:                } else if (periodchar(pch)) {
                    183:                        if (!borderchar(ch))
                    184:                                return (0);
                    185:                } else if (periodchar(nch) || nch == '\0') {
                    186:                        if (!borderchar(ch))
                    187:                                return (0);
                    188:                } else {
                    189:                        if (!middlechar(ch))
                    190:                                return (0);
                    191:                }
                    192:                pch = ch, ch = nch;
                    193:        }
                    194:        return (1);
                    195: }
                    196:
1.7       christos  197: /*%
1.1       christos  198:  * hostname-like (A, MX, WKS) owners can have "*" as their first label
                    199:  * but must otherwise be as a host name.
                    200:  */
                    201: int
                    202: res_ownok(const char *dn) {
                    203:        if (asterchar(dn[0])) {
                    204:                if (periodchar(dn[1]))
                    205:                        return (res_hnok(dn+2));
                    206:                if (dn[1] == '\0')
                    207:                        return (1);
                    208:        }
                    209:        return (res_hnok(dn));
                    210: }
                    211:
1.7       christos  212: /*%
1.1       christos  213:  * SOA RNAMEs and RP RNAMEs can have any printable character in their first
                    214:  * label, but the rest of the name has to look like a host name.
                    215:  */
                    216: int
                    217: res_mailok(const char *dn) {
                    218:        int ch, escaped = 0;
                    219:
                    220:        /* "." is a valid missing representation */
                    221:        if (*dn == '\0')
                    222:                return (1);
                    223:
                    224:        /* otherwise <label>.<hostname> */
                    225:        while ((ch = *dn++) != '\0') {
                    226:                if (!domainchar(ch))
                    227:                        return (0);
                    228:                if (!escaped && periodchar(ch))
                    229:                        break;
                    230:                if (escaped)
                    231:                        escaped = 0;
                    232:                else if (bslashchar(ch))
                    233:                        escaped = 1;
                    234:        }
                    235:        if (periodchar(ch))
                    236:                return (res_hnok(dn));
                    237:        return (0);
                    238: }
                    239:
1.7       christos  240: /*%
                    241:  * This function is quite liberal, since RFC1034's character sets are only
1.1       christos  242:  * recommendations.
                    243:  */
                    244: int
                    245: res_dnok(const char *dn) {
                    246:        int ch;
                    247:
                    248:        while ((ch = *dn++) != '\0')
                    249:                if (!domainchar(ch))
                    250:                        return (0);
                    251:        return (1);
                    252: }
                    253:
                    254: #ifdef BIND_4_COMPAT
1.7       christos  255: /*%
1.1       christos  256:  * This module must export the following externally-visible symbols:
                    257:  *     ___putlong
                    258:  *     ___putshort
                    259:  *     __getlong
                    260:  *     __getshort
                    261:  * Note that one _ comes from C and the others come from us.
                    262:  */
1.7       christos  263:
                    264: #ifdef SOLARIS2
                    265: #ifdef  __putlong
                    266: #undef  __putlong
                    267: #endif
                    268: #ifdef  __putshort
                    269: #undef  __putshort
                    270: #endif
                    271: #pragma weak    putlong         =       __putlong
                    272: #pragma weak    putshort        =       __putshort
                    273: #endif /* SOLARIS2 */
                    274:
1.1       christos  275: void __putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); }
                    276: void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); }
                    277: #ifndef __ultrix__
                    278: u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); }
                    279: u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); }
                    280: #endif /*__ultrix__*/
                    281: #endif /*BIND_4_COMPAT*/
1.7       christos  282:
                    283: /*! \file */

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