bsd/include/arpa/nameser.h

   1 /*
   2  * Copyright (c) 1983, 1989, 1993
   3  *    The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Copyright (c) 1996 by Internet Software Consortium.
  36  *
  37  * Permission to use, copy, modify, and distribute this software for any
  38  * purpose with or without fee is hereby granted, provided that the above
  39  * copyright notice and this permission notice appear in all copies.
  40  *
  41  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
  42  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
  43  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
  44  * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  45  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  46  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  47  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  48  * SOFTWARE.
  49  */
  50
  51 /*
  52  *      From: Id: nameser.h,v 8.16 1998/02/06 00:35:58 halley Exp
  53  * $FreeBSD: src/include/arpa/nameser.h,v 1.12.2.1 1999/08/29 14:39:00 peter Exp $
  54  */
  55
  56 #ifndef _ARPA_NAMESER_H_
  57 #define _ARPA_NAMESER_H_
  58
  59 #define BIND_4_COMPAT
  60
  61 #include <sys/types.h>
  62 #include <sys/cdefs.h>
  63
  64 /*
  65  * revision information.  this is the release date in YYYYMMDD format.
  66  * it can change every day so the right thing to do with it is use it
  67  * in preprocessor commands such as "#if (__NAMESER > 19931104)".  do not
  68  * compare for equality; rather, use it to determine whether your libnameser.a
  69  * is new enough to contain a certain feature.
  70  */
  71
  72 /* XXXRTH I made this bigger than __BIND in 4.9.5 T6B */
  73 #define __NAMESER       19961001        /* New interface version stamp. */
  74
  75 /*
  76  * Define constants based on RFC 883, RFC 1034, RFC 1035
  77  */
  78 #define NS_PACKETSZ     512     /* maximum packet size */
  79 #define NS_MAXDNAME     1025    /* maximum domain name */
  80 #define NS_MAXCDNAME    255     /* maximum compressed domain name */
  81 #define NS_MAXLABEL     63      /* maximum length of domain label */
  82 #define NS_HFIXEDSZ     12      /* #/bytes of fixed data in header */
  83 #define NS_QFIXEDSZ     4       /* #/bytes of fixed data in query */
  84 #define NS_RRFIXEDSZ    10      /* #/bytes of fixed data in r record */
  85 #define NS_INT32SZ      4       /* #/bytes of data in a u_int32_t */
  86 #define NS_INT16SZ      2       /* #/bytes of data in a u_int16_t */
  87 #define NS_INT8SZ       1       /* #/bytes of data in a u_int8_t */
  88 #define NS_INADDRSZ     4       /* IPv4 T_A */
  89 #define NS_IN6ADDRSZ    16      /* IPv6 T_AAAA */
  90 #define NS_CMPRSFLGS    0xc0    /* Flag bits indicating name compression. */
  91 #define NS_DEFAULTPORT  53      /* For both TCP and UDP. */
  92
  93 /*
  94  * These can be expanded with synonyms, just keep ns_parse.c:ns_parserecord()
  95  * in synch with it.
  96  */
  97 typedef enum __ns_sect {
  98         ns_s_qd = 0,            /* Query: Question. */
  99         ns_s_zn = 0,            /* Update: Zone. */
 100         ns_s_an = 1,            /* Query: Answer. */
 101         ns_s_pr = 1,            /* Update: Prerequisites. */
 102         ns_s_ns = 2,            /* Query: Name servers. */
 103         ns_s_ud = 2,            /* Update: Update. */
 104         ns_s_ar = 3,            /* Query|Update: Additional records. */
 105         ns_s_max = 4
 106 } ns_sect;
 107
 108 /*
 109  * This is a message handle.  It is caller allocated and has no dynamic data.
 110  * This structure is intended to be opaque to all but ns_parse.c, thus the
 111  * leading _'s on the member names.  Use the accessor functions, not the _'s.
 112  */
 113 typedef struct __ns_msg {
 114         const u_char    *_msg, *_eom;
 115         u_int16_t       _id, _flags, _counts[ns_s_max];
 116         const u_char    *_sections[ns_s_max];
 117         ns_sect         _sect;
 118         int             _rrnum;
 119         const u_char    *_ptr;
 120 } ns_msg;
 121
 122 /* Private data structure - do not use from outside library. */
 123 struct _ns_flagdata {  int mask, shift;  };
 124 extern struct _ns_flagdata _ns_flagdata[];
 125
 126 /* Accessor macros - this is part of the public interface. */
 127 #define ns_msg_getflag(handle, flag) ( \
 128                         ((handle)._flags & _ns_flagdata[flag].mask) \
 129                          >> _ns_flagdata[flag].shift \
 130                         )
 131 #define ns_msg_id(handle) ((handle)._id + 0)
 132 #define ns_msg_base(handle) ((handle)._msg + 0)
 133 #define ns_msg_end(handle) ((handle)._eom + 0)
 134 #define ns_msg_size(handle) ((handle)._eom - (handle)._msg)
 135 #define ns_msg_count(handle, section) ((handle)._counts[section] + 0)
 136
 137 /*
 138  * This is a parsed record.  It is caller allocated and has no dynamic data.
 139  */
 140 typedef struct __ns_rr {
 141         char            name[NS_MAXDNAME];      /* XXX need to malloc */
 142         u_int16_t       type;
 143         u_int16_t       class;
 144         u_int32_t       ttl;
 145         u_int16_t       rdlength;
 146         const u_char    *rdata;
 147 } ns_rr;
 148
 149 /* Accessor macros - this is part of the public interface. */
 150 #define ns_rr_name(rr)  (((rr).name[0] != '\0') ? (rr).name : ".")
 151 #define ns_rr_type(rr)  ((rr).type + 0)
 152 #define ns_rr_class(rr) ((rr).class + 0)
 153 #define ns_rr_ttl(rr)   ((rr).ttl + 0)
 154 #define ns_rr_rdlen(rr) ((rr).rdlength + 0)
 155 #define ns_rr_rdata(rr) ((rr).rdata + 0)
 156
 157 /*
 158  * These don't have to be in the same order as in the packet flags word,
 159  * and they can even overlap in some cases, but they will need to be kept
 160  * in synch with ns_parse.c:ns_flagdata[].
 161  */
 162 typedef enum __ns_flag {
 163         ns_f_qr,                /* Question/Response. */
 164         ns_f_opcode,            /* Operation code. */
 165         ns_f_aa,                /* Authoritative Answer. */
 166         ns_f_tc,                /* Truncation occurred. */
 167         ns_f_rd,                /* Recursion Desired. */
 168         ns_f_ra,                /* Recursion Available. */
 169         ns_f_z,                 /* MBZ. */
 170         ns_f_ad,                /* Authentic Data (DNSSEC). */
 171         ns_f_cd,                /* Checking Disabled (DNSSEC). */
 172         ns_f_rcode,             /* Response code. */
 173         ns_f_max
 174 } ns_flag;
 175
 176 /*
 177  * Currently defined opcodes.
 178  */
 179 typedef enum __ns_opcode {
 180         ns_o_query = 0,         /* Standard query. */
 181         ns_o_iquery = 1,        /* Inverse query (deprecated/unsupported). */
 182         ns_o_status = 2,        /* Name server status query (unsupported). */
 183                                 /* Opcode 3 is undefined/reserved. */
 184         ns_o_notify = 4,        /* Zone change notification. */
 185         ns_o_update = 5,        /* Zone update message. */
 186         ns_o_max = 6
 187 } ns_opcode;
 188
 189 /*
 190  * Currently defined response codes.
 191  */
 192 typedef enum __ns_rcode {
 193         ns_r_noerror = 0,       /* No error occurred. */
 194         ns_r_formerr = 1,       /* Format error. */
 195         ns_r_servfail = 2,      /* Server failure. */
 196         ns_r_nxdomain = 3,      /* Name error. */
 197         ns_r_notimpl = 4,       /* Unimplemented. */
 198         ns_r_refused = 5,       /* Operation refused. */
 199         /* these are for BIND_UPDATE */
 200         ns_r_yxdomain = 6,      /* Name exists */
 201         ns_r_yxrrset = 7,       /* RRset exists */
 202         ns_r_nxrrset = 8,       /* RRset does not exist */
 203         ns_r_notauth = 9,       /* Not authoritative for zone */
 204         ns_r_notzone = 10,      /* Zone of record different from zone section */
 205         ns_r_max = 11
 206 } ns_rcode;
 207
 208 /* BIND_UPDATE */
 209 typedef enum __ns_update_operation {
 210         ns_uop_delete = 0,
 211         ns_uop_add = 1,
 212         ns_uop_max = 2
 213 } ns_update_operation;
 214
 215 /*
 216  * This RR-like structure is particular to UPDATE.
 217  */
 218 struct ns_updrec {
 219         struct ns_updrec *r_prev;       /* prev record */
 220         struct ns_updrec *r_next;       /* next record */
 221         u_int8_t        r_section;      /* ZONE/PREREQUISITE/UPDATE */
 222         char *          r_dname;        /* owner of the RR */
 223         u_int16_t       r_class;        /* class number */
 224         u_int16_t       r_type;         /* type number */
 225         u_int32_t       r_ttl;          /* time to live */
 226         u_char *        r_data;         /* rdata fields as text string */
 227         u_int16_t       r_size;         /* size of r_data field */
 228         int             r_opcode;       /* type of operation */
 229         /* following fields for private use by the resolver/server routines */
 230         struct ns_updrec *r_grpnext;    /* next record when grouped */
 231         struct databuf *r_dp;           /* databuf to process */
 232         struct databuf *r_deldp;        /* databuf's deleted/overwritten */
 233         u_int16_t       r_zone;         /* zone number on server */
 234 };
 235 typedef struct ns_updrec ns_updrec;
 236
 237 /*
 238  * Currently defined type values for resources and queries.
 239  */
 240 typedef enum __ns_type {
 241         ns_t_a = 1,             /* Host address. */
 242         ns_t_ns = 2,            /* Authoritative server. */
 243         ns_t_md = 3,            /* Mail destination. */
 244         ns_t_mf = 4,            /* Mail forwarder. */
 245         ns_t_cname = 5,         /* Canonical name. */
 246         ns_t_soa = 6,           /* Start of authority zone. */
 247         ns_t_mb = 7,            /* Mailbox domain name. */
 248         ns_t_mg = 8,            /* Mail group member. */
 249         ns_t_mr = 9,            /* Mail rename name. */
 250         ns_t_null = 10,         /* Null resource record. */
 251         ns_t_wks = 11,          /* Well known service. */
 252         ns_t_ptr = 12,          /* Domain name pointer. */
 253         ns_t_hinfo = 13,        /* Host information. */
 254         ns_t_minfo = 14,        /* Mailbox information. */
 255         ns_t_mx = 15,           /* Mail routing information. */
 256         ns_t_txt = 16,          /* Text strings. */
 257         ns_t_rp = 17,           /* Responsible person. */
 258         ns_t_afsdb = 18,        /* AFS cell database. */
 259         ns_t_x25 = 19,          /* X_25 calling address. */
 260         ns_t_isdn = 20,         /* ISDN calling address. */
 261         ns_t_rt = 21,           /* Router. */
 262         ns_t_nsap = 22,         /* NSAP address. */
 263         ns_t_nsap_ptr = 23,     /* Reverse NSAP lookup (deprecated). */
 264         ns_t_sig = 24,          /* Security signature. */
 265         ns_t_key = 25,          /* Security key. */
 266         ns_t_px = 26,           /* X.400 mail mapping. */
 267         ns_t_gpos = 27,         /* Geographical position (withdrawn). */
 268         ns_t_aaaa = 28,         /* Ip6 Address. */
 269         ns_t_loc = 29,          /* Location Information. */
 270         ns_t_nxt = 30,          /* Next domain (security). */
 271         ns_t_eid = 31,          /* Endpoint identifier. */
 272         ns_t_nimloc = 32,       /* Nimrod Locator. */
 273         ns_t_srv = 33,          /* Server Selection. */
 274         ns_t_atma = 34,         /* ATM Address */
 275         ns_t_naptr = 35,        /* Naming Authority PoinTeR */
 276         /* Query type values which do not appear in resource records. */
 277         ns_t_ixfr = 251,        /* Incremental zone transfer. */
 278         ns_t_axfr = 252,        /* Transfer zone of authority. */
 279         ns_t_mailb = 253,       /* Transfer mailbox records. */
 280         ns_t_maila = 254,       /* Transfer mail agent records. */
 281         ns_t_any = 255,         /* Wildcard match. */
 282         ns_t_max = 65536
 283 } ns_type;
 284
 285 /*
 286  * Values for class field
 287  */
 288 typedef enum __ns_class {
 289         ns_c_in = 1,            /* Internet. */
 290                                 /* Class 2 unallocated/unsupported. */
 291         ns_c_chaos = 3,         /* MIT Chaos-net. */
 292         ns_c_hs = 4,            /* MIT Hesiod. */
 293         /* Query class values which do not appear in resource records */
 294         ns_c_none = 254,        /* for prereq. sections in update requests */
 295         ns_c_any = 255,         /* Wildcard match. */
 296         ns_c_max = 65536
 297 } ns_class;
 298
 299 /*
 300  * Flags field of the KEY RR rdata
 301  */
 302 #define NS_KEY_TYPEMASK         0xC000  /* Mask for "type" bits */
 303 #define NS_KEY_TYPE_AUTH_CONF   0x0000  /* Key usable for both */
 304 #define NS_KEY_TYPE_CONF_ONLY   0x8000  /* Key usable for confidentiality */
 305 #define NS_KEY_TYPE_AUTH_ONLY   0x4000  /* Key usable for authentication */
 306 #define NS_KEY_TYPE_NO_KEY      0xC000  /* No key usable for either; no key */
 307 /* The type bits can also be interpreted independently, as single bits: */
 308 #define NS_KEY_NO_AUTH          0x8000  /* Key unusable for authentication */
 309 #define NS_KEY_NO_CONF          0x4000  /* Key unusable for confidentiality */
 310 #define NS_KEY_EXPERIMENTAL     0x2000  /* Security is *mandatory* if bit=0 */
 311 #define NS_KEY_RESERVED3        0x1000  /* reserved - must be zero */
 312 #define NS_KEY_RESERVED4        0x0800  /* reserved - must be zero */
 313 #define NS_KEY_USERACCOUNT      0x0400  /* key is assoc. with a user acct */
 314 #define NS_KEY_ENTITY           0x0200  /* key is assoc. with entity eg host */
 315 #define NS_KEY_ZONEKEY          0x0100  /* key is zone key */
 316 #define NS_KEY_IPSEC            0x0080  /* key is for IPSEC (host or user)*/
 317 #define NS_KEY_EMAIL            0x0040  /* key is for email (MIME security) */
 318 #define NS_KEY_RESERVED10       0x0020  /* reserved - must be zero */
 319 #define NS_KEY_RESERVED11       0x0010  /* reserved - must be zero */
 320 #define NS_KEY_SIGNATORYMASK    0x000F  /* key can sign RR's of same name */
 321
 322 #define NS_KEY_RESERVED_BITMASK ( NS_KEY_RESERVED3 | \
 323                                   NS_KEY_RESERVED4 | \
 324                                   NS_KEY_RESERVED10 | \
 325                                   NS_KEY_RESERVED11 )
 326
 327 /* The Algorithm field of the KEY and SIG RR's is an integer, {1..254} */
 328 #define NS_ALG_MD5RSA           1       /* MD5 with RSA */
 329 #define NS_ALG_EXPIRE_ONLY      253     /* No alg, no security */
 330 #define NS_ALG_PRIVATE_OID      254     /* Key begins with OID giving alg */
 331
 332 /* Signatures */
 333 #define NS_MD5RSA_MIN_BITS       512    /* Size of a mod or exp in bits */
 334 #define NS_MD5RSA_MAX_BITS      2552
 335         /* Total of binary mod and exp */
 336 #define NS_MD5RSA_MAX_BYTES     ((NS_MD5RSA_MAX_BITS+7/8)*2+3)
 337         /* Max length of text sig block */
 338 #define NS_MD5RSA_MAX_BASE64    (((NS_MD5RSA_MAX_BYTES+2)/3)*4)
 339
 340 /* Offsets into SIG record rdata to find various values */
 341 #define NS_SIG_TYPE     0       /* Type flags */
 342 #define NS_SIG_ALG      2       /* Algorithm */
 343 #define NS_SIG_LABELS   3       /* How many labels in name */
 344 #define NS_SIG_OTTL     4       /* Original TTL */
 345 #define NS_SIG_EXPIR    8       /* Expiration time */
 346 #define NS_SIG_SIGNED   12      /* Signature time */
 347 #define NS_SIG_FOOT     16      /* Key footprint */
 348 #define NS_SIG_SIGNER   18      /* Domain name of who signed it */
 349
 350 /* How RR types are represented as bit-flags in NXT records */
 351 #define NS_NXT_BITS 8
 352 #define NS_NXT_BIT_SET(  n,p) (p[(n)/NS_NXT_BITS] |=  (0x80>>((n)%NS_NXT_BITS)))
 353 #define NS_NXT_BIT_CLEAR(n,p) (p[(n)/NS_NXT_BITS] &= ~(0x80>>((n)%NS_NXT_BITS)))
 354 #define NS_NXT_BIT_ISSET(n,p) (p[(n)/NS_NXT_BITS] &   (0x80>>((n)%NS_NXT_BITS)))
 355
 356
 357 /*
 358  * Inline versions of get/put short/long.  Pointer is advanced.
 359  */
 360 #define NS_GET16(s, cp) { \
 361         register u_char *t_cp = (u_char *)(cp); \
 362         (s) = ((u_int16_t)t_cp[0] << 8) \
 363             | ((u_int16_t)t_cp[1]) \
 364             ; \
 365         (cp) += NS_INT16SZ; \
 366 }
 367
 368 #define NS_GET32(l, cp) { \
 369         register u_char *t_cp = (u_char *)(cp); \
 370         (l) = ((u_int32_t)t_cp[0] << 24) \
 371             | ((u_int32_t)t_cp[1] << 16) \
 372             | ((u_int32_t)t_cp[2] << 8) \
 373             | ((u_int32_t)t_cp[3]) \
 374             ; \
 375         (cp) += NS_INT32SZ; \
 376 }
 377
 378 #define NS_PUT16(s, cp) { \
 379         register u_int16_t t_s = (u_int16_t)(s); \
 380         register u_char *t_cp = (u_char *)(cp); \
 381         *t_cp++ = t_s >> 8; \
 382         *t_cp   = t_s; \
 383         (cp) += NS_INT16SZ; \
 384 }
 385
 386 #define NS_PUT32(l, cp) { \
 387         register u_int32_t t_l = (u_int32_t)(l); \
 388         register u_char *t_cp = (u_char *)(cp); \
 389         *t_cp++ = t_l >> 24; \
 390         *t_cp++ = t_l >> 16; \
 391         *t_cp++ = t_l >> 8; \
 392         *t_cp   = t_l; \
 393         (cp) += NS_INT32SZ; \
 394 }
 395
 396 /*
 397  * ANSI C identifier hiding.
 398  */
 399 #define ns_get16                __ns_get16
 400 #define ns_get32                __ns_get32
 401 #define ns_put16                __ns_put16
 402 #define ns_put32                __ns_put32
 403 #define ns_initparse            __ns_initparse
 404 #define ns_parserr              __ns_parserr
 405 #define ns_sprintrr             __ns_sprintrr
 406 #define ns_sprintrrf            __ns_sprintrrf
 407 #define ns_format_ttl           __ns_format_ttl
 408 #define ns_parse_ttl            __ns_parse_ttl
 409 #define ns_name_ntop            __ns_name_ntop
 410 #define ns_name_pton            __ns_name_pton
 411 #define ns_name_unpack          __ns_name_unpack
 412 #define ns_name_pack            __ns_name_pack
 413 #define ns_name_compress        __ns_name_compress
 414 #define ns_name_uncompress      __ns_name_uncompress
 415
 416 __BEGIN_DECLS
 417 u_int           ns_get16 __P((const u_char *));
 418 u_long          ns_get32 __P((const u_char *));
 419 void            ns_put16 __P((u_int, u_char *));
 420 void            ns_put32 __P((u_long, u_char *));
 421 int             ns_initparse __P((const u_char *, int, ns_msg *));
 422 int             ns_parserr __P((ns_msg *, ns_sect, int, ns_rr *));
 423 int             ns_sprintrr __P((const ns_msg *, const ns_rr *,
 424                                  const char *, const char *, char *, size_t));
 425 int             ns_sprintrrf __P((const u_char *, size_t, const char *,
 426                                   ns_class, ns_type, u_long, const u_char *,
 427                                   size_t, const char *, const char *,
 428                                   char *, size_t));
 429 int             ns_format_ttl __P((u_long, char *, size_t));
 430 int             ns_parse_ttl __P((const char *, u_long *));
 431 int             ns_name_ntop __P((const u_char *, char *, size_t));
 432 int             ns_name_pton __P((const char *, u_char *, size_t));
 433 int             ns_name_unpack __P((const u_char *, const u_char *,
 434                                     const u_char *, u_char *, size_t));
 435 int             ns_name_pack __P((const u_char *, u_char *, int,
 436                                   const u_char **, const u_char **));
 437 int             ns_name_uncompress __P((const u_char *, const u_char *,
 438                                         const u_char *, char *, size_t));
 439 int             ns_name_compress __P((const char *, u_char *, size_t,
 440                                       const u_char **, const u_char **));
 441 int             ns_name_skip __P((const u_char **, const u_char *));
 442 __END_DECLS
 443
 444 #ifdef BIND_4_COMPAT
 445 #include <arpa/nameser_compat.h>
 446 #endif
 447
 448 #endif /* !_ARPA_NAMESER_H_ */