StdLib/BsdSocketLib/res_comp.c

   1 /** @file
   2   Copyright (c) 1999 - 2014, Intel Corporation. All rights reserved.<BR>
   3   This program and the accompanying materials are licensed and made available
   4   under the terms and conditions of the BSD License which accompanies this
   5   distribution.  The full text of the license may be found at
   6   http://opensource.org/licenses/bsd-license.php.
   7
   8   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
   9   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  10 **/
  11 /*
  12  * Copyright (c) 1985, 1993
  13  *    The Regents of the University of California.  All rights reserved.
  14  *
  15  * Portions copyright (c) 1999, 2000
  16  * Intel Corporation.
  17  * All rights reserved.
  18  *
  19  * Redistribution and use in source and binary forms, with or without
  20  * modification, are permitted provided that the following conditions
  21  * are met:
  22  *
  23  * 1. Redistributions of source code must retain the above copyright
  24  *    notice, this list of conditions and the following disclaimer.
  25  *
  26  * 2. Redistributions in binary form must reproduce the above copyright
  27  *    notice, this list of conditions and the following disclaimer in the
  28  *    documentation and/or other materials provided with the distribution.
  29  *
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *
  33  *    This product includes software developed by the University of
  34  *    California, Berkeley, Intel Corporation, and its contributors.
  35  *
  36  * 4. Neither the name of University, Intel Corporation, or their respective
  37  *    contributors may be used to endorse or promote products derived from
  38  *    this software without specific prior written permission.
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE REGENTS, INTEL CORPORATION AND
  41  * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
  42  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  43  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS,
  44  * INTEL CORPORATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  45  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  47  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  48  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  49  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  50  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  51  *
  52  */
  53
  54 /*
  55  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  56  *
  57  * Permission to use, copy, modify, and distribute this software for any
  58  * purpose with or without fee is hereby granted, provided that the above
  59  * copyright notice and this permission notice appear in all copies, and that
  60  * the name of Digital Equipment Corporation not be used in advertising or
  61  * publicity pertaining to distribution of the document or software without
  62  * specific, written prior permission.
  63  *
  64  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  65  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  66  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  67  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  68  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  69  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  70  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  71  * SOFTWARE.
  72  */
  73
  74 /*
  75  * Portions Copyright (c) 1996 by Internet Software Consortium.
  76  *
  77  * Permission to use, copy, modify, and distribute this software for any
  78  * purpose with or without fee is hereby granted, provided that the above
  79  * copyright notice and this permission notice appear in all copies.
  80  *
  81  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
  82  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
  83  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
  84  * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  85  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  86  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  87  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  88  * SOFTWARE.
  89  */
  90
  91 #if defined(LIBC_SCCS) && !defined(lint)
  92 static char sccsid[] = "@(#)res_comp.c  8.1 (Berkeley) 6/4/93";
  93 static char orig_rcsid[] = "From: Id: res_comp.c,v 8.11 1997/05/21 19:31:04 halley Exp $";
  94 static char rcsid[] = "$Id: res_comp.c,v 1.1.1.1 2003/11/19 01:51:35 kyu3 Exp $";
  95 #endif /* LIBC_SCCS and not lint */
  96
  97 #include <sys/types.h>
  98 #include <sys/param.h>
  99 #include <netinet/in.h>
 100 #include <arpa/nameser.h>
 101 #include <ctype.h>
 102 #include <resolv.h>
 103 #include <stdio.h>
 104 #include <string.h>
 105 #include <unistd.h>
 106
 107 #define BIND_4_COMPAT
 108
 109 /*
 110  * Expand compressed domain name 'comp_dn' to full domain name.
 111  * 'msg' is a pointer to the begining of the message,
 112  * 'eomorig' points to the first location after the message,
 113  * 'exp_dn' is a pointer to a buffer of size 'length' for the result.
 114  * Return size of compressed name or -1 if there was an error.
 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
 127 /*
 128  * Pack domain name 'exp_dn' in presentation form into 'comp_dn'.
 129  * Return the size of the compressed name or -1.
 130  * 'length' is the size of the array pointed to by 'comp_dn'.
 131  */
 132 int
 133 dn_comp(const char *src, u_char *dst, int dstsiz,
 134     u_char **dnptrs, u_char **lastdnptr)
 135 {
 136     return (ns_name_compress(src, dst, (size_t)dstsiz,
 137                  (const u_char **)dnptrs,
 138                  (const u_char **)lastdnptr));
 139 }
 140
 141 /*
 142  * Skip over a compressed domain name. Return the size or -1.
 143  */
 144 int
 145 dn_skipname(const u_char *ptr, const u_char *eom) {
 146     const u_char *saveptr = ptr;
 147
 148     if (ns_name_skip(&ptr, eom) == -1)
 149         return (-1);
 150     return ((int)(ptr - saveptr));
 151 }
 152
 153 /*
 154  * Verify that a domain name uses an acceptable character set.
 155  */
 156
 157 /*
 158  * Note the conspicuous absence of ctype macros in these definitions.  On
 159  * non-ASCII hosts, we can't depend on string literals or ctype macros to
 160  * tell us anything about network-format data.  The rest of the BIND system
 161  * is not careful about this, but for some reason, we're doing it right here.
 162  */
 163 #define PERIOD 0x2e
 164 #define hyphenchar(c) ((c) == 0x2d)
 165 #define bslashchar(c) ((c) == 0x5c)
 166 #define periodchar(c) ((c) == PERIOD)
 167 #define asterchar(c) ((c) == 0x2a)
 168 #define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \
 169            || ((c) >= 0x61 && (c) <= 0x7a))
 170 #define digitchar(c) ((c) >= 0x30 && (c) <= 0x39)
 171
 172 #define borderchar(c) (alphachar(c) || digitchar(c))
 173 #define middlechar(c) (borderchar(c) || hyphenchar(c))
 174 #define domainchar(c) ((c) > 0x20 && (c) < 0x7f)
 175
 176 int
 177 res_hnok(
 178     const char *dn
 179     )
 180 {
 181     int pch = PERIOD, ch = *dn++;
 182
 183     while (ch != '\0') {
 184         int nch = *dn++;
 185
 186         if (periodchar(ch)) {
 187             (void)NULL;
 188         } else if (periodchar(pch)) {
 189             if (!borderchar(ch))
 190                 return (0);
 191         } else if (periodchar(nch) || nch == '\0') {
 192             if (!borderchar(ch))
 193                 return (0);
 194         } else {
 195             if (!middlechar(ch))
 196                 return (0);
 197         }
 198         pch = ch;
 199         ch = nch;
 200     }
 201     return (1);
 202 }
 203
 204 /*
 205  * hostname-like (A, MX, WKS) owners can have "*" as their first label
 206  * but must otherwise be as a host name.
 207  */
 208 int
 209 res_ownok(
 210     const char *dn
 211     )
 212 {
 213     if (asterchar(dn[0])) {
 214         if (periodchar(dn[1]))
 215             return (res_hnok(dn+2));
 216         if (dn[1] == '\0')
 217             return (1);
 218     }
 219     return (res_hnok(dn));
 220 }
 221
 222 /*
 223  * SOA RNAMEs and RP RNAMEs can have any printable character in their first
 224  * label, but the rest of the name has to look like a host name.
 225  */
 226 int
 227 res_mailok(
 228     const char *dn
 229     )
 230 {
 231     int ch, escaped = 0;
 232
 233     /* "." is a valid missing representation */
 234     if (*dn == '\0')
 235         return (1);
 236
 237     /* otherwise <label>.<hostname> */
 238     while ((ch = *dn++) != '\0') {
 239         if (!domainchar(ch))
 240             return (0);
 241         if (!escaped && periodchar(ch))
 242             break;
 243         if (escaped)
 244             escaped = 0;
 245         else if (bslashchar(ch))
 246             escaped = 1;
 247     }
 248     if (periodchar(ch))
 249         return (res_hnok(dn));
 250     return (0);
 251 }
 252
 253 /*
 254  * This function is quite liberal, since RFC 1034's character sets are only
 255  * recommendations.
 256  */
 257 int
 258 res_dnok(
 259     const char *dn
 260     )
 261 {
 262     int ch;
 263
 264     while ((ch = *dn++) != '\0')
 265         if (!domainchar(ch))
 266             return (0);
 267     return (1);
 268 }
 269
 270 #ifdef BIND_4_COMPAT
 271 /*
 272  * This module must export the following externally-visible symbols:
 273  *    ___putlong
 274  *    ___putshort
 275  *    __getlong
 276  *    __getshort
 277  * Note that one _ comes from C and the others come from us.
 278  */
 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 u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); }
 282 u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); }
 283 #endif /*BIND_4_COMPAT*/