workbench/network/stacks/AROSTCP/dhcp/includes/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) 2004 by Internet Systems Consortium, Inc. ("ISC")
  36  * Copyright (c) 1996-2003 by Internet Software Consortium
  37  *
  38  * Permission to use, copy, modify, and distribute this software for any
  39  * purpose with or without fee is hereby granted, provided that the above
  40  * copyright notice and this permission notice appear in all copies.
  41  *
  42  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  43  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  44  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  45  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  46  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  47  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  48  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  49  *
  50  *   Internet Systems Consortium, Inc.
  51  *   950 Charter Street
  52  *   Redwood City, CA 94063
  53  *   <info@isc.org>
  54  *   http://www.isc.org/
  55  */
  56
  57 /*
  58  *      $Id$
  59  */
  60
  61 #ifndef _ARPA_NAMESER_H_
  62 #define _ARPA_NAMESER_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 libbind.a
  69  * contains a new enough lib/nameser/ to support the feature you need.
  70  */
  71
  72 #define __NAMESER       19991006        /* New interface version stamp. */
  73
  74 /*
  75  * Define constants based on RFC 883, RFC 1034, RFC 1035
  76  */
  77 #define NS_PACKETSZ     512     /* maximum packet size */
  78 #define NS_MAXDNAME     1025    /* maximum domain name */
  79 #define NS_MAXCDNAME    255     /* maximum compressed domain name */
  80 #define NS_MAXLABEL     63      /* maximum length of domain label */
  81 #define NS_HFIXEDSZ     12      /* #/bytes of fixed data in header */
  82 #define NS_QFIXEDSZ     4       /* #/bytes of fixed data in query */
  83 #define NS_RRFIXEDSZ    10      /* #/bytes of fixed data in r record */
  84 #define NS_INT32SZ      4       /* #/bytes of data in a u_int32_t */
  85 #define NS_INT16SZ      2       /* #/bytes of data in a u_int16_t */
  86 #define NS_INT8SZ       1       /* #/bytes of data in a u_int8_t */
  87 #define NS_INADDRSZ     4       /* IPv4 T_A */
  88 #define NS_IN6ADDRSZ    16      /* IPv6 T_AAAA */
  89 #define NS_CMPRSFLGS    0xc0    /* Flag bits indicating name compression. */
  90 #define NS_DEFAULTPORT  53      /* For both TCP and UDP. */
  91
  92 /*
  93  * These can be expanded with synonyms, just keep ns_parse.c:ns_parserecord()
  94  * in synch with it.
  95  */
  96 typedef enum __ns_sect {
  97         ns_s_qd = 0,            /* Query: Question. */
  98         ns_s_zn = 0,            /* Update: Zone. */
  99         ns_s_an = 1,            /* Query: Answer. */
 100         ns_s_pr = 1,            /* Update: Prerequisites. */
 101         ns_s_ns = 2,            /* Query: Name servers. */
 102         ns_s_ud = 2,            /* Update: Update. */
 103         ns_s_ar = 3,            /* Query|Update: Additional records. */
 104         ns_s_max = 4
 105 } ns_sect;
 106
 107 /*
 108  * This is a message handle.  It is caller allocated and has no dynamic data.
 109  * This structure is intended to be opaque to all but ns_parse.c, thus the
 110  * leading _'s on the member names.  Use the accessor functions, not the _'s.
 111  */
 112 typedef struct __ns_msg {
 113         const u_int8_t  *_msg, *_eom;
 114         u_int16_t       _id, _flags, _counts[ns_s_max];
 115         const u_int8_t  *_sections[ns_s_max];
 116         ns_sect         _sect;
 117         int             _rrnum;
 118         const u_int8_t  *_ptr;
 119 } ns_msg;
 120
 121 /* Private data structure - do not use from outside library. */
 122 struct _ns_flagdata {  int mask, shift;  };
 123 extern struct _ns_flagdata _ns_flagdata[];
 124
 125 /* Accessor macros - this is part of the public interface. */
 126 #define ns_msg_getflag(handle, flag) ( \
 127                         ((handle)._flags & _ns_flagdata[flag].mask) \
 128                          >> _ns_flagdata[flag].shift \
 129                         )
 130 #define ns_msg_id(handle) ((handle)._id + 0)
 131 #define ns_msg_base(handle) ((handle)._msg + 0)
 132 #define ns_msg_end(handle) ((handle)._eom + 0)
 133 #define ns_msg_size(handle) ((handle)._eom - (handle)._msg)
 134 #define ns_msg_count(handle, section) ((handle)._counts[section] + 0)
 135
 136 /*
 137  * This is a parsed record.  It is caller allocated and has no dynamic data.
 138  */
 139 typedef struct __ns_rr {
 140         char            name[NS_MAXDNAME];
 141         u_int16_t       type;
 142         u_int16_t       rr_class;
 143         u_int32_t       ttl;
 144         u_int16_t       rdlength;
 145         const u_int8_t *rdata;
 146 } ns_rr;
 147
 148 /* Accessor macros - this is part of the public interface. */
 149 #define ns_rr_name(rr)  (((rr).name[0] != '\0') ? (rr).name : ".")
 150 #define ns_rr_type(rr)  ((ns_type)((rr).type + 0))
 151 #define ns_rr_class(rr) ((ns_class)((rr).rr_class + 0))
 152 #define ns_rr_ttl(rr)   ((rr).ttl + 0)
 153 #define ns_rr_rdlen(rr) ((rr).rdlength + 0)
 154 #define ns_rr_rdata(rr) ((rr).rdata + 0)
 155
 156 /*
 157  * These don't have to be in the same order as in the packet flags word,
 158  * and they can even overlap in some cases, but they will need to be kept
 159  * in synch with ns_parse.c:ns_flagdata[].
 160  */
 161 typedef enum __ns_flag {
 162         ns_f_qr,                /* Question/Response. */
 163         ns_f_opcode,            /* Operation code. */
 164         ns_f_aa,                /* Authoritative Answer. */
 165         ns_f_tc,                /* Truncation occurred. */
 166         ns_f_rd,                /* Recursion Desired. */
 167         ns_f_ra,                /* Recursion Available. */
 168         ns_f_z,                 /* MBZ. */
 169         ns_f_ad,                /* Authentic Data (DNSSEC). */
 170         ns_f_cd,                /* Checking Disabled (DNSSEC). */
 171         ns_f_rcode,             /* Response code. */
 172         ns_f_max
 173 } ns_flag;
 174
 175 /*
 176  * Currently defined opcodes.
 177  */
 178 typedef enum __ns_opcode {
 179         ns_o_query = 0,         /* Standard query. */
 180         ns_o_iquery = 1,        /* Inverse query (deprecated/unsupported). */
 181         ns_o_status = 2,        /* Name server status query (unsupported). */
 182                                 /* Opcode 3 is undefined/reserved. */
 183         ns_o_notify = 4,        /* Zone change notification. */
 184         ns_o_update = 5,        /* Zone update message. */
 185         ns_o_max = 6
 186 } ns_opcode;
 187
 188 /*
 189  * Currently defined response codes.
 190  */
 191 typedef enum __ns_rcode {
 192         ns_r_noerror = 0,       /* No error occurred. */
 193         ns_r_formerr = 1,       /* Format error. */
 194         ns_r_servfail = 2,      /* Server failure. */
 195         ns_r_nxdomain = 3,      /* Name error. */
 196         ns_r_notimpl = 4,       /* Unimplemented. */
 197         ns_r_refused = 5,       /* Operation refused. */
 198         /* these are for BIND_UPDATE */
 199         ns_r_yxdomain = 6,      /* Name exists */
 200         ns_r_yxrrset = 7,       /* RRset exists */
 201         ns_r_nxrrset = 8,       /* RRset does not exist */
 202         ns_r_notauth = 9,       /* Not authoritative for zone */
 203         ns_r_notzone = 10,      /* Zone of record different from zone section */
 204         ns_r_max = 11,
 205         /* The following are TSIG extended errors */
 206         ns_r_badsig = 16,
 207         ns_r_badkey = 17,
 208         ns_r_badtime = 18
 209 } ns_rcode;
 210
 211 /* BIND_UPDATE */
 212 typedef enum __ns_update_operation {
 213         ns_uop_delete = 0,
 214         ns_uop_add = 1,
 215         ns_uop_max = 2
 216 } ns_update_operation;
 217
 218 /*
 219  * This structure is used for TSIG authenticated messages
 220  */
 221 struct ns_tsig_key {
 222         char name[NS_MAXDNAME], alg[NS_MAXDNAME];
 223         unsigned char *data;
 224         unsigned len;
 225 };
 226 typedef struct ns_tsig_key ns_tsig_key;
 227
 228 /*
 229  * This structure is used for TSIG authenticated TCP messages
 230  */
 231 struct ns_tcp_tsig_state {
 232         int counter;
 233         struct dst_key *key;
 234         void *ctx;
 235         unsigned char sig[NS_PACKETSZ];
 236         unsigned siglen;
 237 };
 238 typedef struct ns_tcp_tsig_state ns_tcp_tsig_state;
 239
 240 #define NS_TSIG_FUDGE 300
 241 #define NS_TSIG_TCP_COUNT 100
 242 #define NS_TSIG_ALG_HMAC_MD5 "HMAC-MD5.SIG-ALG.REG.INT"
 243
 244 #define NS_TSIG_ERROR_NO_TSIG -10
 245 #define NS_TSIG_ERROR_NO_SPACE -11
 246 #define NS_TSIG_ERROR_FORMERR -12
 247
 248 /*
 249  * Currently defined type values for resources and queries.
 250  */
 251 typedef enum __ns_type {
 252         ns_t_invalid = 0,       /* Cookie. */
 253         ns_t_a = 1,             /* Host address. */
 254         ns_t_ns = 2,            /* Authoritative server. */
 255         ns_t_md = 3,            /* Mail destination. */
 256         ns_t_mf = 4,            /* Mail forwarder. */
 257         ns_t_cname = 5,         /* Canonical name. */
 258         ns_t_soa = 6,           /* Start of authority zone. */
 259         ns_t_mb = 7,            /* Mailbox domain name. */
 260         ns_t_mg = 8,            /* Mail group member. */
 261         ns_t_mr = 9,            /* Mail rename name. */
 262         ns_t_null = 10,         /* Null resource record. */
 263         ns_t_wks = 11,          /* Well known service. */
 264         ns_t_ptr = 12,          /* Domain name pointer. */
 265         ns_t_hinfo = 13,        /* Host information. */
 266         ns_t_minfo = 14,        /* Mailbox information. */
 267         ns_t_mx = 15,           /* Mail routing information. */
 268         ns_t_txt = 16,          /* Text strings. */
 269         ns_t_rp = 17,           /* Responsible person. */
 270         ns_t_afsdb = 18,        /* AFS cell database. */
 271         ns_t_x25 = 19,          /* X_25 calling address. */
 272         ns_t_isdn = 20,         /* ISDN calling address. */
 273         ns_t_rt = 21,           /* Router. */
 274         ns_t_nsap = 22,         /* NSAP address. */
 275         ns_t_nsap_ptr = 23,     /* Reverse NSAP lookup (deprecated). */
 276         ns_t_sig = 24,          /* Security signature. */
 277         ns_t_key = 25,          /* Security key. */
 278         ns_t_px = 26,           /* X.400 mail mapping. */
 279         ns_t_gpos = 27,         /* Geographical position (withdrawn). */
 280         ns_t_aaaa = 28,         /* Ip6 Address. */
 281         ns_t_loc = 29,          /* Location Information. */
 282         ns_t_nxt = 30,          /* Next domain (security). */
 283         ns_t_eid = 31,          /* Endpoint identifier. */
 284         ns_t_nimloc = 32,       /* Nimrod Locator. */
 285         ns_t_srv = 33,          /* Server Selection. */
 286         ns_t_atma = 34,         /* ATM Address */
 287         ns_t_naptr = 35,        /* Naming Authority PoinTeR */
 288         ns_t_kx = 36,           /* Key Exchange */
 289         ns_t_cert = 37,         /* Certification record */
 290         ns_t_a6 = 38,           /* IPv6 address (deprecates AAAA) */
 291         ns_t_dname = 39,        /* Non-terminal DNAME (for IPv6) */
 292         ns_t_sink = 40,         /* Kitchen sink (experimentatl) */
 293         ns_t_opt = 41,          /* EDNS0 option (meta-RR) */
 294         ns_t_tsig = 250,        /* Transaction signature. */
 295         ns_t_ixfr = 251,        /* Incremental zone transfer. */
 296         ns_t_axfr = 252,        /* Transfer zone of authority. */
 297         ns_t_mailb = 253,       /* Transfer mailbox records. */
 298         ns_t_maila = 254,       /* Transfer mail agent records. */
 299         ns_t_any = 255,         /* Wildcard match. */
 300         ns_t_zxfr = 256,        /* BIND-specific, nonstandard. */
 301         ns_t_max = 65536
 302 } ns_type;
 303
 304 /* Exclusively a QTYPE? (not also an RTYPE) */
 305 #define ns_t_qt_p(t) (ns_t_xfr_p(t) || (t) == ns_t_any || \
 306                       (t) == ns_t_mailb || (t) == ns_t_maila)
 307 /* Some kind of meta-RR? (not a QTYPE, but also not an RTYPE) */
 308 #define ns_t_mrr_p(t) ((t) == ns_t_tsig || (t) == ns_t_opt)
 309 /* Exclusively an RTYPE? (not also a QTYPE or a meta-RR) */
 310 #define ns_t_rr_p(t) (!ns_t_qt_p(t) && !ns_t_mrr_p(t))
 311 #define ns_t_udp_p(t) ((t) != ns_t_axfr && (t) != ns_t_zxfr)
 312 #define ns_t_xfr_p(t) ((t) == ns_t_axfr || (t) == ns_t_ixfr || \
 313                        (t) == ns_t_zxfr)
 314
 315 /*
 316  * Values for class field
 317  */
 318 typedef enum __ns_class {
 319         ns_c_invalid = 0,       /* Cookie. */
 320         ns_c_in = 1,            /* Internet. */
 321         ns_c_2 = 2,             /* unallocated/unsupported. */
 322         ns_c_chaos = 3,         /* MIT Chaos-net. */
 323         ns_c_hs = 4,            /* MIT Hesiod. */
 324         /* Query class values which do not appear in resource records */
 325         ns_c_none = 254,        /* for prereq. sections in update requests */
 326         ns_c_any = 255,         /* Wildcard match. */
 327         ns_c_max = 65536
 328 } ns_class;
 329
 330 /* DNSSEC constants. */
 331
 332 typedef enum __ns_key_types {
 333         ns_kt_rsa = 1,          /* key type RSA/MD5 */
 334         ns_kt_dh  = 2,          /* Diffie Hellman */
 335         ns_kt_dsa = 3,          /* Digital Signature Standard (MANDATORY) */
 336         ns_kt_private = 254     /* Private key type starts with OID */
 337 } ns_key_types;
 338
 339 typedef enum __ns_cert_types {
 340         cert_t_pkix = 1,        /* PKIX (X.509v3) */
 341         cert_t_spki = 2,        /* SPKI */
 342         cert_t_pgp  = 3,        /* PGP */
 343         cert_t_url  = 253,      /* URL private type */
 344         cert_t_oid  = 254       /* OID private type */
 345 } ns_cert_types;
 346
 347 /* Flags field of the KEY RR rdata. */
 348 #define NS_KEY_TYPEMASK         0xC000  /* Mask for "type" bits */
 349 #define NS_KEY_TYPE_AUTH_CONF   0x0000  /* Key usable for both */
 350 #define NS_KEY_TYPE_CONF_ONLY   0x8000  /* Key usable for confidentiality */
 351 #define NS_KEY_TYPE_AUTH_ONLY   0x4000  /* Key usable for authentication */
 352 #define NS_KEY_TYPE_NO_KEY      0xC000  /* No key usable for either; no key */
 353 /* The type bits can also be interpreted independently, as single bits: */
 354 #define NS_KEY_NO_AUTH          0x8000  /* Key unusable for authentication */
 355 #define NS_KEY_NO_CONF          0x4000  /* Key unusable for confidentiality */
 356 #define NS_KEY_RESERVED2        0x2000  /* Security is *mandatory* if bit=0 */
 357 #define NS_KEY_EXTENDED_FLAGS   0x1000  /* reserved - must be zero */
 358 #define NS_KEY_RESERVED4        0x0800  /* reserved - must be zero */
 359 #define NS_KEY_RESERVED5        0x0400  /* reserved - must be zero */
 360 #define NS_KEY_NAME_TYPE        0x0300  /* these bits determine the type */
 361 #define NS_KEY_NAME_USER        0x0000  /* key is assoc. with user */
 362 #define NS_KEY_NAME_ENTITY      0x0200  /* key is assoc. with entity eg host */
 363 #define NS_KEY_NAME_ZONE        0x0100  /* key is zone key */
 364 #define NS_KEY_NAME_RESERVED    0x0300  /* reserved meaning */
 365 #define NS_KEY_RESERVED8        0x0080  /* reserved - must be zero */
 366 #define NS_KEY_RESERVED9        0x0040  /* reserved - must be zero */
 367 #define NS_KEY_RESERVED10       0x0020  /* reserved - must be zero */
 368 #define NS_KEY_RESERVED11       0x0010  /* reserved - must be zero */
 369 #define NS_KEY_SIGNATORYMASK    0x000F  /* key can sign RR's of same name */
 370 #define NS_KEY_RESERVED_BITMASK ( NS_KEY_RESERVED2 | \
 371                                   NS_KEY_RESERVED4 | \
 372                                   NS_KEY_RESERVED5 | \
 373                                   NS_KEY_RESERVED8 | \
 374                                   NS_KEY_RESERVED9 | \
 375                                   NS_KEY_RESERVED10 | \
 376                                   NS_KEY_RESERVED11 )
 377 #define NS_KEY_RESERVED_BITMASK2 0xFFFF /* no bits defined here */
 378
 379 /* The Algorithm field of the KEY and SIG RR's is an integer, {1..254} */
 380 #define NS_ALG_MD5RSA           1       /* MD5 with RSA */
 381 #define NS_ALG_DH               2       /* Diffie Hellman KEY */
 382 #define NS_ALG_DSA              3       /* DSA KEY */
 383 #define NS_ALG_DSS              NS_ALG_DSA
 384 #define NS_ALG_EXPIRE_ONLY      253     /* No alg, no security */
 385 #define NS_ALG_PRIVATE_OID      254     /* Key begins with OID giving alg */
 386
 387 /* Protocol values  */
 388 /* value 0 is reserved */
 389 #define NS_KEY_PROT_TLS         1
 390 #define NS_KEY_PROT_EMAIL       2
 391 #define NS_KEY_PROT_DNSSEC      3
 392 #define NS_KEY_PROT_IPSEC       4
 393 #define NS_KEY_PROT_ANY         255
 394
 395 /* Signatures */
 396 #define NS_MD5RSA_MIN_BITS       512    /* Size of a mod or exp in bits */
 397 #define NS_MD5RSA_MAX_BITS      2552
 398         /* Total of binary mod and exp */
 399 #define NS_MD5RSA_MAX_BYTES     ((NS_MD5RSA_MAX_BITS+7/8)*2+3)
 400         /* Max length of text sig block */
 401 #define NS_MD5RSA_MAX_BASE64    (((NS_MD5RSA_MAX_BYTES+2)/3)*4)
 402 #define NS_MD5RSA_MIN_SIZE      ((NS_MD5RSA_MIN_BITS+7)/8)
 403 #define NS_MD5RSA_MAX_SIZE      ((NS_MD5RSA_MAX_BITS+7)/8)
 404
 405 #define NS_DSA_SIG_SIZE         41
 406 #define NS_DSA_MIN_SIZE         213
 407 #define NS_DSA_MAX_BYTES        405
 408
 409 /* Offsets into SIG record rdata to find various values */
 410 #define NS_SIG_TYPE     0       /* Type flags */
 411 #define NS_SIG_ALG      2       /* Algorithm */
 412 #define NS_SIG_LABELS   3       /* How many labels in name */
 413 #define NS_SIG_OTTL     4       /* Original TTL */
 414 #define NS_SIG_EXPIR    8       /* Expiration time */
 415 #define NS_SIG_SIGNED   12      /* Signature time */
 416 #define NS_SIG_FOOT     16      /* Key footprint */
 417 #define NS_SIG_SIGNER   18      /* Domain name of who signed it */
 418
 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  * Inline versions of get/put short/long.  Pointer is advanced.
 428  */
 429 #define NS_GET16(s, cp) do { \
 430         register u_int8_t *t_cp = (u_int8_t *)(cp); \
 431         (s) = ((u_int16_t)t_cp[0] << 8) \
 432             | ((u_int16_t)t_cp[1]) \
 433             ; \
 434         (cp) += NS_INT16SZ; \
 435         (void)(s); /* prevents 'set but unused' compiler lint */ \
 436 } while (0)
 437
 438 #define NS_GET32(l, cp) do { \
 439         register u_int8_t *t_cp = (u_int8_t *)(cp); \
 440         (l) = ((u_int32_t)t_cp[0] << 24) \
 441             | ((u_int32_t)t_cp[1] << 16) \
 442             | ((u_int32_t)t_cp[2] << 8) \
 443             | ((u_int32_t)t_cp[3]) \
 444             ; \
 445         (cp) += NS_INT32SZ; \
 446         (void)(l); /* prevents 'set but unused' compiler lint */ \
 447 } while (0)
 448
 449 #define NS_PUT16(s, cp) do { \
 450         register u_int16_t t_s = (u_int16_t)(s); \
 451         register u_int8_t *t_cp = (u_int8_t *)(cp); \
 452         *t_cp++ = t_s >> 8; \
 453         *t_cp   = t_s; \
 454         (cp) += NS_INT16SZ; \
 455 } while (0)
 456
 457 #define NS_PUT32(l, cp) do { \
 458         register u_int32_t t_l = (u_int32_t)(l); \
 459         register u_int8_t *t_cp = (u_int8_t *)(cp); \
 460         *t_cp++ = t_l >> 24; \
 461         *t_cp++ = t_l >> 16; \
 462         *t_cp++ = t_l >> 8; \
 463         *t_cp   = t_l; \
 464         (cp) += NS_INT32SZ; \
 465 } while (0)
 466
 467 #include <arpa/nameser_compat.h>
 468
 469 #endif /* !_ARPA_NAMESER_H_ */