resolv/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  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 /*
  31  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  32  * Copyright (c) 1996-1999 by Internet Software Consortium.
  33  *
  34  * Permission to use, copy, modify, and distribute this software for any
  35  * purpose with or without fee is hereby granted, provided that the above
  36  * copyright notice and this permission notice appear in all copies.
  37  *
  38  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
  39  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
  40  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
  41  * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  42  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  43  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  44  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  45  * SOFTWARE.
  46  */
  47
  48 /*
  49  *      $BINDId: nameser.h,v 8.37 2000/03/30 21:16:49 vixie Exp $
  50  */
  51
  52 #ifndef _ARPA_NAMESER_H_
  53 #define _ARPA_NAMESER_H_
  54
  55 /*! \file */
  56
  57 #define BIND_4_COMPAT
  58
  59 #include <sys/param.h>
  60 #if (!defined(BSD)) || (BSD < 199306)
  61 # include <sys/bitypes.h>
  62 #else
  63 # include <sys/types.h>
  64 #endif
  65 #include <sys/cdefs.h>
  66
  67 /*%
  68  * Revision information.  This is the release date in YYYYMMDD format.
  69  * It can change every day so the right thing to do with it is use it
  70  * in preprocessor commands such as "#if (__NAMESER > 19931104)".  Do not
  71  * compare for equality; rather, use it to determine whether your libbind.a
  72  * contains a new enough lib/nameser/ to support the feature you need.
  73  */
  74
  75 #define __NAMESER       19991006        /*%< New interface version stamp. */
  76 /*
  77  * Define constants based on RFC 883, RFC 1034, RFC 1035
  78  */
  79 #define NS_PACKETSZ     512     /*%< default UDP packet size */
  80 #define NS_MAXDNAME     1025    /*%< maximum domain name */
  81 #define NS_MAXMSG       65535   /*%< maximum message size */
  82 #define NS_MAXCDNAME    255     /*%< maximum compressed domain name */
  83 #define NS_MAXLABEL     63      /*%< maximum length of domain label */
  84 #define NS_HFIXEDSZ     12      /*%< #/bytes of fixed data in header */
  85 #define NS_QFIXEDSZ     4       /*%< #/bytes of fixed data in query */
  86 #define NS_RRFIXEDSZ    10      /*%< #/bytes of fixed data in r record */
  87 #define NS_INT32SZ      4       /*%< #/bytes of data in a u_int32_t */
  88 #define NS_INT16SZ      2       /*%< #/bytes of data in a u_int16_t */
  89 #define NS_INT8SZ       1       /*%< #/bytes of data in a u_int8_t */
  90 #define NS_INADDRSZ     4       /*%< IPv4 T_A */
  91 #define NS_IN6ADDRSZ    16      /*%< IPv6 T_AAAA */
  92 #define NS_CMPRSFLGS    0xc0    /*%< Flag bits indicating name compression. */
  93 #define NS_DEFAULTPORT  53      /*%< For both TCP and UDP. */
  94 /*
  95  * These can be expanded with synonyms, just keep ns_parse.c:ns_parserecord()
  96  * in synch with it.
  97  */
  98 typedef enum __ns_sect {
  99         ns_s_qd = 0,            /*%< Query: Question. */
 100         ns_s_zn = 0,            /*%< Update: Zone. */
 101         ns_s_an = 1,            /*%< Query: Answer. */
 102         ns_s_pr = 1,            /*%< Update: Prerequisites. */
 103         ns_s_ns = 2,            /*%< Query: Name servers. */
 104         ns_s_ud = 2,            /*%< Update: Update. */
 105         ns_s_ar = 3,            /*%< Query|Update: Additional records. */
 106         ns_s_max = 4
 107 } ns_sect;
 108
 109 /*%
 110  * This is a message handle.  It is caller allocated and has no dynamic data.
 111  * This structure is intended to be opaque to all but ns_parse.c, thus the
 112  * leading _'s on the member names.  Use the accessor functions, not the _'s.
 113  */
 114 typedef struct __ns_msg {
 115         const u_char    *_msg, *_eom;
 116         u_int16_t       _id, _flags, _counts[ns_s_max];
 117         const u_char    *_sections[ns_s_max];
 118         ns_sect         _sect;
 119         int             _rrnum;
 120         const u_char    *_msg_ptr;
 121 } ns_msg;
 122
 123 /* Private data structure - do not use from outside library. */
 124 struct _ns_flagdata {  int mask, shift;  };
 125 extern const struct _ns_flagdata _ns_flagdata[];
 126
 127 /* Accessor macros - this is part of the public interface. */
 128
 129 #define ns_msg_id(handle) ((handle)._id + 0)
 130 #define ns_msg_base(handle) ((handle)._msg + 0)
 131 #define ns_msg_end(handle) ((handle)._eom + 0)
 132 #define ns_msg_size(handle) ((handle)._eom - (handle)._msg)
 133 #define ns_msg_count(handle, section) ((handle)._counts[section] + 0)
 134
 135 /*%
 136  * This is a parsed record.  It is caller allocated and has no dynamic data.
 137  */
 138 typedef struct __ns_rr {
 139         char            name[NS_MAXDNAME];
 140         u_int16_t       type;
 141         u_int16_t       rr_class;
 142         u_int32_t       ttl;
 143         u_int16_t       rdlength;
 144         const u_char *  rdata;
 145 } ns_rr;
 146
 147 /* Accessor macros - this is part of the public interface. */
 148 #define ns_rr_name(rr)  (((rr).name[0] != '\0') ? (rr).name : ".")
 149 #define ns_rr_type(rr)  ((ns_type)((rr).type + 0))
 150 #define ns_rr_class(rr) ((ns_class)((rr).rr_class + 0))
 151 #define ns_rr_ttl(rr)   ((rr).ttl + 0)
 152 #define ns_rr_rdlen(rr) ((rr).rdlength + 0)
 153 #define ns_rr_rdata(rr) ((rr).rdata + 0)
 154
 155 /*%
 156  * These don't have to be in the same order as in the packet flags word,
 157  * and they can even overlap in some cases, but they will need to be kept
 158  * in synch with ns_parse.c:ns_flagdata[].
 159  */
 160 typedef enum __ns_flag {
 161         ns_f_qr,                /*%< Question/Response. */
 162         ns_f_opcode,            /*%< Operation code. */
 163         ns_f_aa,                /*%< Authoritative Answer. */
 164         ns_f_tc,                /*%< Truncation occurred. */
 165         ns_f_rd,                /*%< Recursion Desired. */
 166         ns_f_ra,                /*%< Recursion Available. */
 167         ns_f_z,                 /*%< MBZ. */
 168         ns_f_ad,                /*%< Authentic Data (DNSSEC). */
 169         ns_f_cd,                /*%< Checking Disabled (DNSSEC). */
 170         ns_f_rcode,             /*%< Response code. */
 171         ns_f_max
 172 } ns_flag;
 173
 174 /*%
 175  * Currently defined opcodes.
 176  */
 177 typedef enum __ns_opcode {
 178         ns_o_query = 0,         /*%< Standard query. */
 179         ns_o_iquery = 1,        /*%< Inverse query (deprecated/unsupported). */
 180         ns_o_status = 2,        /*%< Name server status query (unsupported). */
 181                                 /* Opcode 3 is undefined/reserved. */
 182         ns_o_notify = 4,        /*%< Zone change notification. */
 183         ns_o_update = 5,        /*%< Zone update message. */
 184         ns_o_max = 6
 185 } ns_opcode;
 186
 187 /*%
 188  * Currently defined response codes.
 189  */
 190 typedef enum __ns_rcode {
 191         ns_r_noerror = 0,       /*%< No error occurred. */
 192         ns_r_formerr = 1,       /*%< Format error. */
 193         ns_r_servfail = 2,      /*%< Server failure. */
 194         ns_r_nxdomain = 3,      /*%< Name error. */
 195         ns_r_notimpl = 4,       /*%< Unimplemented. */
 196         ns_r_refused = 5,       /*%< Operation refused. */
 197         /* these are for BIND_UPDATE */
 198         ns_r_yxdomain = 6,      /*%< Name exists */
 199         ns_r_yxrrset = 7,       /*%< RRset exists */
 200         ns_r_nxrrset = 8,       /*%< RRset does not exist */
 201         ns_r_notauth = 9,       /*%< Not authoritative for zone */
 202         ns_r_notzone = 10,      /*%< Zone of record different from zone section */
 203         ns_r_max = 11,
 204         /* The following are EDNS extended rcodes */
 205         ns_r_badvers = 16,
 206         /* The following are TSIG errors */
 207         ns_r_badsig = 16,
 208         ns_r_badkey = 17,
 209         ns_r_badtime = 18
 210 } ns_rcode;
 211
 212 /* BIND_UPDATE */
 213 typedef enum __ns_update_operation {
 214         ns_uop_delete = 0,
 215         ns_uop_add = 1,
 216         ns_uop_max = 2
 217 } ns_update_operation;
 218
 219 /*%
 220  * This structure is used for TSIG authenticated messages
 221  */
 222 struct ns_tsig_key {
 223         char name[NS_MAXDNAME], alg[NS_MAXDNAME];
 224         unsigned char *data;
 225         int len;
 226 };
 227 typedef struct ns_tsig_key ns_tsig_key;
 228
 229 /*%
 230  * This structure is used for TSIG authenticated TCP messages
 231  */
 232 struct ns_tcp_tsig_state {
 233         int counter;
 234         struct dst_key *key;
 235         void *ctx;
 236         unsigned char sig[NS_PACKETSZ];
 237         int siglen;
 238 };
 239 typedef struct ns_tcp_tsig_state ns_tcp_tsig_state;
 240
 241 #define NS_TSIG_FUDGE 300
 242 #define NS_TSIG_TCP_COUNT 100
 243 #define NS_TSIG_ALG_HMAC_MD5 "HMAC-MD5.SIG-ALG.REG.INT"
 244
 245 #define NS_TSIG_ERROR_NO_TSIG -10
 246 #define NS_TSIG_ERROR_NO_SPACE -11
 247 #define NS_TSIG_ERROR_FORMERR -12
 248
 249 /*%
 250  * Currently defined type values for resources and queries.
 251  */
 252 typedef enum __ns_type {
 253         ns_t_invalid = 0,       /*%< Cookie. */
 254         ns_t_a = 1,             /*%< Host address. */
 255         ns_t_ns = 2,            /*%< Authoritative server. */
 256         ns_t_md = 3,            /*%< Mail destination. */
 257         ns_t_mf = 4,            /*%< Mail forwarder. */
 258         ns_t_cname = 5,         /*%< Canonical name. */
 259         ns_t_soa = 6,           /*%< Start of authority zone. */
 260         ns_t_mb = 7,            /*%< Mailbox domain name. */
 261         ns_t_mg = 8,            /*%< Mail group member. */
 262         ns_t_mr = 9,            /*%< Mail rename name. */
 263         ns_t_null = 10,         /*%< Null resource record. */
 264         ns_t_wks = 11,          /*%< Well known service. */
 265         ns_t_ptr = 12,          /*%< Domain name pointer. */
 266         ns_t_hinfo = 13,        /*%< Host information. */
 267         ns_t_minfo = 14,        /*%< Mailbox information. */
 268         ns_t_mx = 15,           /*%< Mail routing information. */
 269         ns_t_txt = 16,          /*%< Text strings. */
 270         ns_t_rp = 17,           /*%< Responsible person. */
 271         ns_t_afsdb = 18,        /*%< AFS cell database. */
 272         ns_t_x25 = 19,          /*%< X_25 calling address. */
 273         ns_t_isdn = 20,         /*%< ISDN calling address. */
 274         ns_t_rt = 21,           /*%< Router. */
 275         ns_t_nsap = 22,         /*%< NSAP address. */
 276         ns_t_nsap_ptr = 23,     /*%< Reverse NSAP lookup (deprecated). */
 277         ns_t_sig = 24,          /*%< Security signature. */
 278         ns_t_key = 25,          /*%< Security key. */
 279         ns_t_px = 26,           /*%< X.400 mail mapping. */
 280         ns_t_gpos = 27,         /*%< Geographical position (withdrawn). */
 281         ns_t_aaaa = 28,         /*%< Ip6 Address. */
 282         ns_t_loc = 29,          /*%< Location Information. */
 283         ns_t_nxt = 30,          /*%< Next domain (security). */
 284         ns_t_eid = 31,          /*%< Endpoint identifier. */
 285         ns_t_nimloc = 32,       /*%< Nimrod Locator. */
 286         ns_t_srv = 33,          /*%< Server Selection. */
 287         ns_t_atma = 34,         /*%< ATM Address */
 288         ns_t_naptr = 35,        /*%< Naming Authority PoinTeR */
 289         ns_t_kx = 36,           /*%< Key Exchange */
 290         ns_t_cert = 37,         /*%< Certification record */
 291         ns_t_a6 = 38,           /*%< IPv6 address (deprecated, use ns_t_aaaa) */
 292         ns_t_dname = 39,        /*%< Non-terminal DNAME (for IPv6) */
 293         ns_t_sink = 40,         /*%< Kitchen sink (experimentatl) */
 294         ns_t_opt = 41,          /*%< EDNS0 option (meta-RR) */
 295         ns_t_apl = 42,          /*%< Address prefix list (RFC3123) */
 296         ns_t_tkey = 249,        /*%< Transaction key */
 297         ns_t_tsig = 250,        /*%< Transaction signature. */
 298         ns_t_ixfr = 251,        /*%< Incremental zone transfer. */
 299         ns_t_axfr = 252,        /*%< Transfer zone of authority. */
 300         ns_t_mailb = 253,       /*%< Transfer mailbox records. */
 301         ns_t_maila = 254,       /*%< Transfer mail agent records. */
 302         ns_t_any = 255,         /*%< Wildcard match. */
 303         ns_t_zxfr = 256,        /*%< BIND-specific, nonstandard. */
 304         ns_t_max = 65536
 305 } ns_type;
 306
 307 /* Exclusively a QTYPE? (not also an RTYPE) */
 308 #define ns_t_qt_p(t) (ns_t_xfr_p(t) || (t) == ns_t_any || \
 309                       (t) == ns_t_mailb || (t) == ns_t_maila)
 310 /* Some kind of meta-RR? (not a QTYPE, but also not an RTYPE) */
 311 #define ns_t_mrr_p(t) ((t) == ns_t_tsig || (t) == ns_t_opt)
 312 /* Exclusively an RTYPE? (not also a QTYPE or a meta-RR) */
 313 #define ns_t_rr_p(t) (!ns_t_qt_p(t) && !ns_t_mrr_p(t))
 314 #define ns_t_udp_p(t) ((t) != ns_t_axfr && (t) != ns_t_zxfr)
 315 #define ns_t_xfr_p(t) ((t) == ns_t_axfr || (t) == ns_t_ixfr || \
 316                        (t) == ns_t_zxfr)
 317
 318 /*%
 319  * Values for class field
 320  */
 321 typedef enum __ns_class {
 322         ns_c_invalid = 0,       /*%< Cookie. */
 323         ns_c_in = 1,            /*%< Internet. */
 324         ns_c_2 = 2,             /*%< unallocated/unsupported. */
 325         ns_c_chaos = 3,         /*%< MIT Chaos-net. */
 326         ns_c_hs = 4,            /*%< MIT Hesiod. */
 327         /* Query class values which do not appear in resource records */
 328         ns_c_none = 254,        /*%< for prereq. sections in update requests */
 329         ns_c_any = 255,         /*%< Wildcard match. */
 330         ns_c_max = 65536
 331 } ns_class;
 332
 333 /* DNSSEC constants. */
 334
 335 typedef enum __ns_key_types {
 336         ns_kt_rsa = 1,          /*%< key type RSA/MD5 */
 337         ns_kt_dh  = 2,          /*%< Diffie Hellman */
 338         ns_kt_dsa = 3,          /*%< Digital Signature Standard (MANDATORY) */
 339         ns_kt_private = 254     /*%< Private key type starts with OID */
 340 } ns_key_types;
 341
 342 typedef enum __ns_cert_types {
 343         cert_t_pkix = 1,        /*%< PKIX (X.509v3) */
 344         cert_t_spki = 2,        /*%< SPKI */
 345         cert_t_pgp  = 3,        /*%< PGP */
 346         cert_t_url  = 253,      /*%< URL private type */
 347         cert_t_oid  = 254       /*%< OID private type */
 348 } ns_cert_types;
 349
 350 /* Flags field of the KEY RR rdata. */
 351 #define NS_KEY_TYPEMASK         0xC000  /*%< Mask for "type" bits */
 352 #define NS_KEY_TYPE_AUTH_CONF   0x0000  /*%< Key usable for both */
 353 #define NS_KEY_TYPE_CONF_ONLY   0x8000  /*%< Key usable for confidentiality */
 354 #define NS_KEY_TYPE_AUTH_ONLY   0x4000  /*%< Key usable for authentication */
 355 #define NS_KEY_TYPE_NO_KEY      0xC000  /*%< No key usable for either; no key */
 356 /* The type bits can also be interpreted independently, as single bits: */
 357 #define NS_KEY_NO_AUTH          0x8000  /*%< Key unusable for authentication */
 358 #define NS_KEY_NO_CONF          0x4000  /*%< Key unusable for confidentiality */
 359 #define NS_KEY_RESERVED2        0x2000  /* Security is *mandatory* if bit=0 */
 360 #define NS_KEY_EXTENDED_FLAGS   0x1000  /*%< reserved - must be zero */
 361 #define NS_KEY_RESERVED4        0x0800  /*%< reserved - must be zero */
 362 #define NS_KEY_RESERVED5        0x0400  /*%< reserved - must be zero */
 363 #define NS_KEY_NAME_TYPE        0x0300  /*%< these bits determine the type */
 364 #define NS_KEY_NAME_USER        0x0000  /*%< key is assoc. with user */
 365 #define NS_KEY_NAME_ENTITY      0x0200  /*%< key is assoc. with entity eg host */
 366 #define NS_KEY_NAME_ZONE        0x0100  /*%< key is zone key */
 367 #define NS_KEY_NAME_RESERVED    0x0300  /*%< reserved meaning */
 368 #define NS_KEY_RESERVED8        0x0080  /*%< reserved - must be zero */
 369 #define NS_KEY_RESERVED9        0x0040  /*%< reserved - must be zero */
 370 #define NS_KEY_RESERVED10       0x0020  /*%< reserved - must be zero */
 371 #define NS_KEY_RESERVED11       0x0010  /*%< reserved - must be zero */
 372 #define NS_KEY_SIGNATORYMASK    0x000F  /*%< key can sign RR's of same name */
 373 #define NS_KEY_RESERVED_BITMASK ( NS_KEY_RESERVED2 | \
 374                                   NS_KEY_RESERVED4 | \
 375                                   NS_KEY_RESERVED5 | \
 376                                   NS_KEY_RESERVED8 | \
 377                                   NS_KEY_RESERVED9 | \
 378                                   NS_KEY_RESERVED10 | \
 379                                   NS_KEY_RESERVED11 )
 380 #define NS_KEY_RESERVED_BITMASK2 0xFFFF /*%< no bits defined here */
 381 /* The Algorithm field of the KEY and SIG RR's is an integer, {1..254} */
 382 #define NS_ALG_MD5RSA           1       /*%< MD5 with RSA */
 383 #define NS_ALG_DH               2       /*%< Diffie Hellman KEY */
 384 #define NS_ALG_DSA              3       /*%< DSA KEY */
 385 #define NS_ALG_DSS              NS_ALG_DSA
 386 #define NS_ALG_EXPIRE_ONLY      253     /*%< No alg, no security */
 387 #define NS_ALG_PRIVATE_OID      254     /*%< Key begins with OID giving alg */
 388 /* Protocol values  */
 389 /* value 0 is reserved */
 390 #define NS_KEY_PROT_TLS         1
 391 #define NS_KEY_PROT_EMAIL       2
 392 #define NS_KEY_PROT_DNSSEC      3
 393 #define NS_KEY_PROT_IPSEC       4
 394 #define NS_KEY_PROT_ANY         255
 395
 396 /* Signatures */
 397 #define NS_MD5RSA_MIN_BITS       512    /*%< Size of a mod or exp in bits */
 398 #define NS_MD5RSA_MAX_BITS      4096
 399         /* Total of binary mod and exp */
 400 #define NS_MD5RSA_MAX_BYTES     ((NS_MD5RSA_MAX_BITS+7/8)*2+3)
 401         /* Max length of text sig block */
 402 #define NS_MD5RSA_MAX_BASE64    (((NS_MD5RSA_MAX_BYTES+2)/3)*4)
 403 #define NS_MD5RSA_MIN_SIZE      ((NS_MD5RSA_MIN_BITS+7)/8)
 404 #define NS_MD5RSA_MAX_SIZE      ((NS_MD5RSA_MAX_BITS+7)/8)
 405
 406 #define NS_DSA_SIG_SIZE         41
 407 #define NS_DSA_MIN_SIZE         213
 408 #define NS_DSA_MAX_BYTES        405
 409
 410 /* Offsets into SIG record rdata to find various values */
 411 #define NS_SIG_TYPE     0       /*%< Type flags */
 412 #define NS_SIG_ALG      2       /*%< Algorithm */
 413 #define NS_SIG_LABELS   3       /*%< How many labels in name */
 414 #define NS_SIG_OTTL     4       /*%< Original TTL */
 415 #define NS_SIG_EXPIR    8       /*%< Expiration time */
 416 #define NS_SIG_SIGNED   12      /*%< Signature time */
 417 #define NS_SIG_FOOT     16      /*%< Key footprint */
 418 #define NS_SIG_SIGNER   18      /*%< Domain name of who signed it */
 419 /* How RR types are represented as bit-flags in NXT records */
 420 #define NS_NXT_BITS 8
 421 #define NS_NXT_BIT_SET(  n,p) (p[(n)/NS_NXT_BITS] |=  (0x80>>((n)%NS_NXT_BITS)))
 422 #define NS_NXT_BIT_CLEAR(n,p) (p[(n)/NS_NXT_BITS] &= ~(0x80>>((n)%NS_NXT_BITS)))
 423 #define NS_NXT_BIT_ISSET(n,p) (p[(n)/NS_NXT_BITS] &   (0x80>>((n)%NS_NXT_BITS)))
 424 #define NS_NXT_MAX 127
 425
 426 /*%
 427  * EDNS0 extended flags and option codes, host order.
 428  */
 429 #define NS_OPT_DNSSEC_OK        0x8000U
 430 #define NS_OPT_NSID             3
 431
 432 /*%
 433  * Inline versions of get/put short/long.  Pointer is advanced.
 434  */
 435 #define NS_GET16(s, cp) do { \
 436         const u_char *t_cp = (const u_char *)(cp); \
 437         (s) = ((u_int16_t)t_cp[0] << 8) \
 438             | ((u_int16_t)t_cp[1]) \
 439             ; \
 440         (cp) += NS_INT16SZ; \
 441 } while (0)
 442
 443 #define NS_GET32(l, cp) do { \
 444         const u_char *t_cp = (const u_char *)(cp); \
 445         (l) = ((u_int32_t)t_cp[0] << 24) \
 446             | ((u_int32_t)t_cp[1] << 16) \
 447             | ((u_int32_t)t_cp[2] << 8) \
 448             | ((u_int32_t)t_cp[3]) \
 449             ; \
 450         (cp) += NS_INT32SZ; \
 451 } while (0)
 452
 453 #define NS_PUT16(s, cp) do { \
 454         u_int16_t t_s = (u_int16_t)(s); \
 455         u_char *t_cp = (u_char *)(cp); \
 456         *t_cp++ = t_s >> 8; \
 457         *t_cp   = t_s; \
 458         (cp) += NS_INT16SZ; \
 459 } while (0)
 460
 461 #define NS_PUT32(l, cp) do { \
 462         u_int32_t t_l = (u_int32_t)(l); \
 463         u_char *t_cp = (u_char *)(cp); \
 464         *t_cp++ = t_l >> 24; \
 465         *t_cp++ = t_l >> 16; \
 466         *t_cp++ = t_l >> 8; \
 467         *t_cp   = t_l; \
 468         (cp) += NS_INT32SZ; \
 469 } while (0)
 470
 471 __BEGIN_DECLS
 472 int             ns_msg_getflag (ns_msg, int) __THROW;
 473 u_int           ns_get16 (const u_char *) __THROW;
 474 u_long          ns_get32 (const u_char *) __THROW;
 475 void            ns_put16 (u_int, u_char *) __THROW;
 476 void            ns_put32 (u_long, u_char *) __THROW;
 477 int             ns_initparse (const u_char *, int, ns_msg *) __THROW;
 478 int             ns_skiprr (const u_char *, const u_char *, ns_sect, int)
 479      __THROW;
 480 int             ns_parserr (ns_msg *, ns_sect, int, ns_rr *) __THROW;
 481 int             ns_sprintrr (const ns_msg *, const ns_rr *,
 482                              const char *, const char *, char *, size_t)
 483      __THROW;
 484 int             ns_sprintrrf (const u_char *, size_t, const char *,
 485                               ns_class, ns_type, u_long, const u_char *,
 486                               size_t, const char *, const char *,
 487                               char *, size_t) __THROW;
 488 int             ns_format_ttl (u_long, char *, size_t) __THROW;
 489 int             ns_parse_ttl (const char *, u_long *) __THROW;
 490 u_int32_t       ns_datetosecs (const char *, int *) __THROW;
 491 int             ns_name_ntol (const u_char *, u_char *, size_t) __THROW;
 492 int             ns_name_ntop (const u_char *, char *, size_t) __THROW;
 493 int             ns_name_pton (const char *, u_char *, size_t) __THROW;
 494 int             ns_name_unpack (const u_char *, const u_char *,
 495                                 const u_char *, u_char *, size_t) __THROW;
 496 int             ns_name_pack (const u_char *, u_char *, int,
 497                               const u_char **, const u_char **) __THROW;
 498 int             ns_name_uncompress (const u_char *, const u_char *,
 499                                     const u_char *, char *, size_t) __THROW;
 500 int             ns_name_compress (const char *, u_char *, size_t,
 501                                   const u_char **, const u_char **) __THROW;
 502 int             ns_name_skip (const u_char **, const u_char *) __THROW;
 503 void            ns_name_rollback (const u_char *, const u_char **,
 504                                   const u_char **) __THROW;
 505 int             ns_sign (u_char *, int *, int, int, void *,
 506                          const u_char *, int, u_char *, int *, time_t) __THROW;
 507 int             ns_sign2 (u_char *, int *, int, int, void *,
 508                           const u_char *, int, u_char *, int *, time_t,
 509                           u_char **, u_char **) __THROW;
 510 int             ns_sign_tcp (u_char *, int *, int, int,
 511                              ns_tcp_tsig_state *, int) __THROW;
 512 int             ns_sign_tcp2 (u_char *, int *, int, int,
 513                               ns_tcp_tsig_state *, int,
 514                               u_char **, u_char **) __THROW;
 515 int             ns_sign_tcp_init (void *, const u_char *, int,
 516                                   ns_tcp_tsig_state *) __THROW;
 517 u_char          *ns_find_tsig (u_char *, u_char *) __THROW;
 518 int             ns_verify (u_char *, int *, void *, const u_char *, int,
 519                            u_char *, int *, time_t *, int) __THROW;
 520 int             ns_verify_tcp (u_char *, int *, ns_tcp_tsig_state *, int)
 521      __THROW;
 522 int             ns_verify_tcp_init (void *, const u_char *, int,
 523                                     ns_tcp_tsig_state *) __THROW;
 524 int             ns_samedomain (const char *, const char *) __THROW;
 525 int             ns_subdomain (const char *, const char *) __THROW;
 526 int             ns_makecanon (const char *, char *, size_t) __THROW;
 527 int             ns_samename (const char *, const char *) __THROW;
 528 __END_DECLS
 529
 530 #ifdef BIND_4_COMPAT
 531 #include <arpa/nameser_compat.h>
 532 #endif
 533
 534 #endif /* !_ARPA_NAMESER_H_ */
 535 /*! \file */