other-licenses/android/res_comp.c

   1 /*      $NetBSD: res_comp.c,v 1.6 2004/05/22 23:47:09 christos Exp $    */
   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  */
  72
  73 /*
  74  * This version of this file is derived from Android 2.3 "Gingerbread",
  75  * which contains uncredited changes by Android/Google developers.  It has
  76  * been modified in 2011 for use in the Android build of Mozilla Firefox by
  77  * Mozilla contributors (including Michael Edwards <m.k.edwards@gmail.com>,
  78  * and Steve Workman <sjhworkman@gmail.com>).
  79  * These changes are offered under the same license as the original NetBSD
  80  * file, whose copyright and license are unchanged above.
  81  */
  82
  83 #define ANDROID_CHANGES 1
  84 #define MOZILLA_NECKO_EXCLUDE_CODE 1
  85
  86 #include <sys/cdefs.h>
  87 #if defined(LIBC_SCCS) && !defined(lint)
  88 #ifdef notdef
  89 static const char sccsid[] = "@(#)res_comp.c    8.1 (Berkeley) 6/4/93";
  90 static const char rcsid[] = "Id: res_comp.c,v 1.1.2.1.4.1 2004/03/09 08:33:54 marka Exp";
  91 #else
  92 __RCSID("$NetBSD: res_comp.c,v 1.6 2004/05/22 23:47:09 christos Exp $");
  93 #endif
  94 #endif /* LIBC_SCCS and not lint */
  95
  96 #include <sys/types.h>
  97 #include <sys/param.h>
  98 #include <netinet/in.h>
  99 #include "arpa_nameser.h"
 100 #include <ctype.h>
 101 #ifdef ANDROID_CHANGES
 102 #include "resolv_private.h"
 103 #else
 104 #include <resolv.h>
 105 #endif
 106 #include <stdio.h>
 107 #include <string.h>
 108 #include <unistd.h>
 109
 110 /*
 111  * Expand compressed domain name 'src' to full domain name.
 112  * 'msg' is a pointer to the begining of the message,
 113  * 'eom' points to the first location after the message,
 114  * 'dst' is a pointer to a buffer of size 'dstsiz' for the result.
 115  * Return size of compressed name or -1 if there was an error.
 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
 128 /*
 129  * Pack domain name 'exp_dn' in presentation form into 'comp_dn'.
 130  * Return the size of the compressed name or -1.
 131  * 'length' is the size of the array pointed to by 'comp_dn'.
 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
 142 /*
 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
 154 /*
 155  * Verify that a domain name uses an acceptable character set.
 156  */
 157
 158 /*
 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
 165 /* BIONIC: We also accept underscores in the middle of labels.
 166  *         This extension is needed to make resolution on some VPN networks
 167  *         work properly.
 168  */
 169
 170 #define PERIOD 0x2e
 171 #define hyphenchar(c) ((c) == 0x2d)
 172 #define bslashchar(c) ((c) == 0x5c)
 173 #define periodchar(c) ((c) == PERIOD)
 174 #define asterchar(c) ((c) == 0x2a)
 175 #define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \
 176                    || ((c) >= 0x61 && (c) <= 0x7a))
 177 #define digitchar(c) ((c) >= 0x30 && (c) <= 0x39)
 178 #define underscorechar(c)  ((c) == 0x5f)
 179
 180 #define borderchar(c) (alphachar(c) || digitchar(c))
 181 #define middlechar(c) (borderchar(c) || hyphenchar(c) || underscorechar(c))
 182 #define domainchar(c) ((c) > 0x20 && (c) < 0x7f)
 183
 184 int
 185 res_hnok(const char *dn) {
 186         int pch = PERIOD, ch = *dn++;
 187
 188         while (ch != '\0') {
 189                 int nch = *dn++;
 190
 191                 if (periodchar(ch)) {
 192                         ;
 193                 } else if (periodchar(pch)) {
 194                         if (!borderchar(ch))
 195                                 return (0);
 196                 } else if (periodchar(nch) || nch == '\0') {
 197                         if (!borderchar(ch))
 198                                 return (0);
 199                 } else {
 200                         if (!middlechar(ch))
 201                                 return (0);
 202                 }
 203                 pch = ch, ch = nch;
 204         }
 205         return (1);
 206 }
 207
 208 #ifndef MOZILLA_NECKO_EXCLUDE_CODE
 209 /*
 210  * hostname-like (A, MX, WKS) owners can have "*" as their first label
 211  * but must otherwise be as a host name.
 212  */
 213 int
 214 res_ownok(const char *dn) {
 215         if (asterchar(dn[0])) {
 216                 if (periodchar(dn[1]))
 217                         return (res_hnok(dn+2));
 218                 if (dn[1] == '\0')
 219                         return (1);
 220         }
 221         return (res_hnok(dn));
 222 }
 223
 224 /*
 225  * SOA RNAMEs and RP RNAMEs can have any printable character in their first
 226  * label, but the rest of the name has to look like a host name.
 227  */
 228 int
 229 res_mailok(const char *dn) {
 230         int ch, escaped = 0;
 231
 232         /* "." is a valid missing representation */
 233         if (*dn == '\0')
 234                 return (1);
 235
 236         /* otherwise <label>.<hostname> */
 237         while ((ch = *dn++) != '\0') {
 238                 if (!domainchar(ch))
 239                         return (0);
 240                 if (!escaped && periodchar(ch))
 241                         break;
 242                 if (escaped)
 243                         escaped = 0;
 244                 else if (bslashchar(ch))
 245                         escaped = 1;
 246         }
 247         if (periodchar(ch))
 248                 return (res_hnok(dn));
 249         return (0);
 250 }
 251
 252 /*
 253  * This function is quite liberal, since RFC 1034's character sets are only
 254  * recommendations.
 255  */
 256 int
 257 res_dnok(const char *dn) {
 258         int ch;
 259
 260         while ((ch = *dn++) != '\0')
 261                 if (!domainchar(ch))
 262                         return (0);
 263         return (1);
 264 }
 265 #endif
 266
 267 #ifdef BIND_4_COMPAT
 268 /*
 269  * This module must export the following externally-visible symbols:
 270  *      ___putlong
 271  *      ___putshort
 272  *      __getlong
 273  *      __getshort
 274  * Note that one _ comes from C and the others come from us.
 275  */
 276 void __putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); }
 277 void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); }
 278 #ifndef __ultrix__
 279 u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); }
 280 u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); }
 281 #endif /*__ultrix__*/
 282 #endif /*BIND_4_COMPAT*/