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      1 /*	$NetBSD: nameser.h,v 1.19 2005/12/26 19:01:47 perry Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 1989, 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. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
     34  * Copyright (c) 1996-1999 by Internet Software Consortium.
     35  *
     36  * Permission to use, copy, modify, and distribute this software for any
     37  * purpose with or without fee is hereby granted, provided that the above
     38  * copyright notice and this permission notice appear in all copies.
     39  *
     40  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
     41  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     42  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
     43  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     44  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     45  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
     46  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     47  */
     48 
     49 /*
     50  *	Id: nameser.h,v 1.2.2.4.4.1 2004/03/09 08:33:30 marka Exp
     51  */
     52 
     53 #ifndef _ARPA_NAMESER_H_
     54 #define _ARPA_NAMESER_H_
     55 
     56 #define BIND_4_COMPAT
     57 
     58 #include <sys/types.h>
     59 #include <sys/cdefs.h>
     60 
     61 /*
     62  * Revision information.  This is the release date in YYYYMMDD format.
     63  * It can change every day so the right thing to do with it is use it
     64  * in preprocessor commands such as "#if (__NAMESER > 19931104)".  Do not
     65  * compare for equality; rather, use it to determine whether your libbind.a
     66  * contains a new enough lib/nameser/ to support the feature you need.
     67  */
     68 
     69 #define __NAMESER	19991006	/* New interface version stamp. */
     70 
     71 /*
     72  * Define constants based on RFC 883, RFC 1034, RFC 1035
     73  */
     74 #define NS_PACKETSZ	512	/* default UDP packet size */
     75 #define NS_MAXDNAME	1025	/* maximum domain name */
     76 #define NS_MAXMSG	65535	/* maximum message size */
     77 #define NS_MAXCDNAME	255	/* maximum compressed domain name */
     78 #define NS_MAXLABEL	63	/* maximum length of domain label */
     79 #define NS_HFIXEDSZ	12	/* #/bytes of fixed data in header */
     80 #define NS_QFIXEDSZ	4	/* #/bytes of fixed data in query */
     81 #define NS_RRFIXEDSZ	10	/* #/bytes of fixed data in r record */
     82 #define NS_INT32SZ	4	/* #/bytes of data in a uint32_t */
     83 #define NS_INT16SZ	2	/* #/bytes of data in a uint16_t */
     84 #define NS_INT8SZ	1	/* #/bytes of data in a uint8_t */
     85 #define NS_INADDRSZ	4	/* IPv4 T_A */
     86 #define NS_IN6ADDRSZ	16	/* IPv6 T_AAAA */
     87 #define NS_CMPRSFLGS	0xc0	/* Flag bits indicating name compression. */
     88 #define NS_DEFAULTPORT	53	/* For both TCP and UDP. */
     89 
     90 /*
     91  * These can be expanded with synonyms, just keep ns_parse.c:ns_parserecord()
     92  * in synch with it.
     93  */
     94 typedef enum __ns_sect {
     95 	ns_s_qd = 0,		/* Query: Question. */
     96 	ns_s_zn = 0,		/* Update: Zone. */
     97 	ns_s_an = 1,		/* Query: Answer. */
     98 	ns_s_pr = 1,		/* Update: Prerequisites. */
     99 	ns_s_ns = 2,		/* Query: Name servers. */
    100 	ns_s_ud = 2,		/* Update: Update. */
    101 	ns_s_ar = 3,		/* Query|Update: Additional records. */
    102 	ns_s_max = 4
    103 } ns_sect;
    104 
    105 /*
    106  * This is a message handle.  It is caller allocated and has no dynamic data.
    107  * This structure is intended to be opaque to all but ns_parse.c, thus the
    108  * leading _'s on the member names.  Use the accessor functions, not the _'s.
    109  */
    110 typedef struct __ns_msg {
    111 	const u_char	*_msg, *_eom;
    112 	uint16_t	_id, _flags, _counts[ns_s_max];
    113 	const u_char	*_sections[ns_s_max];
    114 	ns_sect		_sect;
    115 	int		_rrnum;
    116 	const u_char	*_msg_ptr;
    117 } ns_msg;
    118 
    119 /* Private data structure - do not use from outside library. */
    120 struct _ns_flagdata {  int mask, shift;  };
    121 extern const struct _ns_flagdata _ns_flagdata[];
    122 
    123 /* Accessor macros - this is part of the public interface. */
    124 
    125 #define ns_msg_id(handle) ((handle)._id + 0)
    126 #define ns_msg_base(handle) ((handle)._msg + 0)
    127 #define ns_msg_end(handle) ((handle)._eom + 0)
    128 #define ns_msg_size(handle) ((size_t)((handle)._eom - (handle)._msg))
    129 #define ns_msg_count(handle, section) ((handle)._counts[section] + 0)
    130 
    131 /*
    132  * This is a parsed record.  It is caller allocated and has no dynamic data.
    133  */
    134 typedef	struct __ns_rr {
    135 	char		name[NS_MAXDNAME];
    136 	uint16_t	type;
    137 	uint16_t	rr_class;
    138 	uint32_t	ttl;
    139 	uint16_t	rdlength;
    140 	const u_char *	rdata;
    141 } ns_rr;
    142 
    143 /* Accessor macros - this is part of the public interface. */
    144 #define ns_rr_name(rr)	(((rr).name[0] != '\0') ? (rr).name : ".")
    145 #define ns_rr_type(rr)	((ns_type)((rr).type + 0))
    146 #define ns_rr_class(rr)	((ns_class)((rr).rr_class + 0))
    147 #define ns_rr_ttl(rr)	((u_long)(rr).ttl + 0)
    148 #define ns_rr_rdlen(rr)	((size_t)(rr).rdlength + 0)
    149 #define ns_rr_rdata(rr)	((rr).rdata + 0)
    150 
    151 /*
    152  * These don't have to be in the same order as in the packet flags word,
    153  * and they can even overlap in some cases, but they will need to be kept
    154  * in synch with ns_parse.c:ns_flagdata[].
    155  */
    156 typedef enum __ns_flag {
    157 	ns_f_qr,		/* Question/Response. */
    158 	ns_f_opcode,		/* Operation code. */
    159 	ns_f_aa,		/* Authoritative Answer. */
    160 	ns_f_tc,		/* Truncation occurred. */
    161 	ns_f_rd,		/* Recursion Desired. */
    162 	ns_f_ra,		/* Recursion Available. */
    163 	ns_f_z,			/* MBZ. */
    164 	ns_f_ad,		/* Authentic Data (DNSSEC). */
    165 	ns_f_cd,		/* Checking Disabled (DNSSEC). */
    166 	ns_f_rcode,		/* Response code. */
    167 	ns_f_max
    168 } ns_flag;
    169 
    170 /*
    171  * Currently defined opcodes.
    172  */
    173 typedef enum __ns_opcode {
    174 	ns_o_query = 0,		/* Standard query. */
    175 	ns_o_iquery = 1,	/* Inverse query (deprecated/unsupported). */
    176 	ns_o_status = 2,	/* Name server status query (unsupported). */
    177 				/* Opcode 3 is undefined/reserved. */
    178 	ns_o_notify = 4,	/* Zone change notification. */
    179 	ns_o_update = 5,	/* Zone update message. */
    180 	ns_o_max = 6
    181 } ns_opcode;
    182 
    183 /*
    184  * Currently defined response codes.
    185  */
    186 typedef	enum __ns_rcode {
    187 	ns_r_noerror = 0,	/* No error occurred. */
    188 	ns_r_formerr = 1,	/* Format error. */
    189 	ns_r_servfail = 2,	/* Server failure. */
    190 	ns_r_nxdomain = 3,	/* Name error. */
    191 	ns_r_notimpl = 4,	/* Unimplemented. */
    192 	ns_r_refused = 5,	/* Operation refused. */
    193 	/* these are for BIND_UPDATE */
    194 	ns_r_yxdomain = 6,	/* Name exists */
    195 	ns_r_yxrrset = 7,	/* RRset exists */
    196 	ns_r_nxrrset = 8,	/* RRset does not exist */
    197 	ns_r_notauth = 9,	/* Not authoritative for zone */
    198 	ns_r_notzone = 10,	/* Zone of record different from zone section */
    199 	ns_r_max = 11,
    200 	/* The following are EDNS extended rcodes */
    201 	ns_r_badvers = 16,
    202 	/* The following are TSIG errors */
    203 	ns_r_badsig = 16,
    204 	ns_r_badkey = 17,
    205 	ns_r_badtime = 18
    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 structure is used for TSIG authenticated messages
    217  */
    218 struct ns_tsig_key {
    219         char name[NS_MAXDNAME], alg[NS_MAXDNAME];
    220         unsigned char *data;
    221         int len;
    222 };
    223 typedef struct ns_tsig_key ns_tsig_key;
    224 
    225 /*
    226  * This structure is used for TSIG authenticated TCP messages
    227  */
    228 struct ns_tcp_tsig_state {
    229 	int counter;
    230 	struct dst_key *key;
    231 	void *ctx;
    232 	unsigned char sig[NS_PACKETSZ];
    233 	int siglen;
    234 };
    235 typedef struct ns_tcp_tsig_state ns_tcp_tsig_state;
    236 
    237 #define NS_TSIG_FUDGE 300
    238 #define NS_TSIG_TCP_COUNT 100
    239 #define NS_TSIG_ALG_HMAC_MD5 "HMAC-MD5.SIG-ALG.REG.INT"
    240 
    241 #define NS_TSIG_ERROR_NO_TSIG -10
    242 #define NS_TSIG_ERROR_NO_SPACE -11
    243 #define NS_TSIG_ERROR_FORMERR -12
    244 
    245 /*
    246  * Currently defined type values for resources and queries.
    247  */
    248 typedef enum __ns_type {
    249 	ns_t_invalid = 0,	/* Cookie. */
    250 	ns_t_a = 1,		/* Host address. */
    251 	ns_t_ns = 2,		/* Authoritative server. */
    252 	ns_t_md = 3,		/* Mail destination. */
    253 	ns_t_mf = 4,		/* Mail forwarder. */
    254 	ns_t_cname = 5,		/* Canonical name. */
    255 	ns_t_soa = 6,		/* Start of authority zone. */
    256 	ns_t_mb = 7,		/* Mailbox domain name. */
    257 	ns_t_mg = 8,		/* Mail group member. */
    258 	ns_t_mr = 9,		/* Mail rename name. */
    259 	ns_t_null = 10,		/* Null resource record. */
    260 	ns_t_wks = 11,		/* Well known service. */
    261 	ns_t_ptr = 12,		/* Domain name pointer. */
    262 	ns_t_hinfo = 13,	/* Host information. */
    263 	ns_t_minfo = 14,	/* Mailbox information. */
    264 	ns_t_mx = 15,		/* Mail routing information. */
    265 	ns_t_txt = 16,		/* Text strings. */
    266 	ns_t_rp = 17,		/* Responsible person. */
    267 	ns_t_afsdb = 18,	/* AFS cell database. */
    268 	ns_t_x25 = 19,		/* X_25 calling address. */
    269 	ns_t_isdn = 20,		/* ISDN calling address. */
    270 	ns_t_rt = 21,		/* Router. */
    271 	ns_t_nsap = 22,		/* NSAP address. */
    272 	ns_t_nsap_ptr = 23,	/* Reverse NSAP lookup (deprecated). */
    273 	ns_t_sig = 24,		/* Security signature. */
    274 	ns_t_key = 25,		/* Security key. */
    275 	ns_t_px = 26,		/* X.400 mail mapping. */
    276 	ns_t_gpos = 27,		/* Geographical position (withdrawn). */
    277 	ns_t_aaaa = 28,		/* Ip6 Address. */
    278 	ns_t_loc = 29,		/* Location Information. */
    279 	ns_t_nxt = 30,		/* Next domain (security). */
    280 	ns_t_eid = 31,		/* Endpoint identifier. */
    281 	ns_t_nimloc = 32,	/* Nimrod Locator. */
    282 	ns_t_srv = 33,		/* Server Selection. */
    283 	ns_t_atma = 34,		/* ATM Address */
    284 	ns_t_naptr = 35,	/* Naming Authority PoinTeR */
    285 	ns_t_kx = 36,		/* Key Exchange */
    286 	ns_t_cert = 37,		/* Certification record */
    287 	ns_t_a6 = 38,		/* IPv6 address (deprecates AAAA) */
    288 	ns_t_dname = 39,	/* Non-terminal DNAME (for IPv6) */
    289 	ns_t_sink = 40,		/* Kitchen sink (experimentatl) */
    290 	ns_t_opt = 41,		/* EDNS0 option (meta-RR) */
    291 	ns_t_apl = 42,		/* Address prefix list (RFC 3123) */
    292 	ns_t_tkey = 249,	/* Transaction key */
    293 	ns_t_tsig = 250,	/* Transaction signature. */
    294 	ns_t_ixfr = 251,	/* Incremental zone transfer. */
    295 	ns_t_axfr = 252,	/* Transfer zone of authority. */
    296 	ns_t_mailb = 253,	/* Transfer mailbox records. */
    297 	ns_t_maila = 254,	/* Transfer mail agent records. */
    298 	ns_t_any = 255,		/* Wildcard match. */
    299 	ns_t_zxfr = 256,	/* BIND-specific, nonstandard. */
    300 	ns_t_max = 65536
    301 } ns_type;
    302 
    303 /* Exclusively a QTYPE? (not also an RTYPE) */
    304 #define	ns_t_qt_p(t) (ns_t_xfr_p(t) || (t) == ns_t_any || \
    305 		      (t) == ns_t_mailb || (t) == ns_t_maila)
    306 /* Some kind of meta-RR? (not a QTYPE, but also not an RTYPE) */
    307 #define	ns_t_mrr_p(t) ((t) == ns_t_tsig || (t) == ns_t_opt)
    308 /* Exclusively an RTYPE? (not also a QTYPE or a meta-RR) */
    309 #define ns_t_rr_p(t) (!ns_t_qt_p(t) && !ns_t_mrr_p(t))
    310 #define ns_t_udp_p(t) ((t) != ns_t_axfr && (t) != ns_t_zxfr)
    311 #define ns_t_xfr_p(t) ((t) == ns_t_axfr || (t) == ns_t_ixfr || \
    312 		       (t) == ns_t_zxfr)
    313 
    314 /*
    315  * Values for class field
    316  */
    317 typedef enum __ns_class {
    318 	ns_c_invalid = 0,	/* Cookie. */
    319 	ns_c_in = 1,		/* Internet. */
    320 	ns_c_2 = 2,		/* unallocated/unsupported. */
    321 	ns_c_chaos = 3,		/* MIT Chaos-net. */
    322 	ns_c_hs = 4,		/* MIT Hesiod. */
    323 	/* Query class values which do not appear in resource records */
    324 	ns_c_none = 254,	/* for prereq. sections in update requests */
    325 	ns_c_any = 255,		/* Wildcard match. */
    326 	ns_c_max = 65536
    327 } ns_class;
    328 
    329 /* DNSSEC constants. */
    330 
    331 typedef enum __ns_key_types {
    332 	ns_kt_rsa = 1,		/* key type RSA/MD5 */
    333 	ns_kt_dh  = 2,		/* Diffie Hellman */
    334 	ns_kt_dsa = 3,		/* Digital Signature Standard (MANDATORY) */
    335 	ns_kt_private = 254	/* Private key type starts with OID */
    336 } ns_key_types;
    337 
    338 typedef enum __ns_cert_types {
    339 	cert_t_pkix = 1,	/* PKIX (X.509v3) */
    340 	cert_t_spki = 2,	/* SPKI */
    341 	cert_t_pgp  = 3,	/* PGP */
    342 	cert_t_url  = 253,	/* URL private type */
    343 	cert_t_oid  = 254	/* OID private type */
    344 } ns_cert_types;
    345 
    346 /* Flags field of the KEY RR rdata. */
    347 #define	NS_KEY_TYPEMASK		0xC000	/* Mask for "type" bits */
    348 #define	NS_KEY_TYPE_AUTH_CONF	0x0000	/* Key usable for both */
    349 #define	NS_KEY_TYPE_CONF_ONLY	0x8000	/* Key usable for confidentiality */
    350 #define	NS_KEY_TYPE_AUTH_ONLY	0x4000	/* Key usable for authentication */
    351 #define	NS_KEY_TYPE_NO_KEY	0xC000	/* No key usable for either; no key */
    352 /* The type bits can also be interpreted independently, as single bits: */
    353 #define	NS_KEY_NO_AUTH		0x8000	/* Key unusable for authentication */
    354 #define	NS_KEY_NO_CONF		0x4000	/* Key unusable for confidentiality */
    355 #define	NS_KEY_RESERVED2	0x2000	/* Security is *mandatory* if bit=0 */
    356 #define	NS_KEY_EXTENDED_FLAGS	0x1000	/* reserved - must be zero */
    357 #define	NS_KEY_RESERVED4	0x0800  /* reserved - must be zero */
    358 #define	NS_KEY_RESERVED5	0x0400  /* reserved - must be zero */
    359 #define	NS_KEY_NAME_TYPE	0x0300	/* these bits determine the type */
    360 #define	NS_KEY_NAME_USER	0x0000	/* key is assoc. with user */
    361 #define	NS_KEY_NAME_ENTITY	0x0200	/* key is assoc. with entity eg host */
    362 #define	NS_KEY_NAME_ZONE	0x0100	/* key is zone key */
    363 #define	NS_KEY_NAME_RESERVED	0x0300	/* reserved meaning */
    364 #define	NS_KEY_RESERVED8	0x0080  /* reserved - must be zero */
    365 #define	NS_KEY_RESERVED9	0x0040  /* reserved - must be zero */
    366 #define	NS_KEY_RESERVED10	0x0020  /* reserved - must be zero */
    367 #define	NS_KEY_RESERVED11	0x0010  /* reserved - must be zero */
    368 #define	NS_KEY_SIGNATORYMASK	0x000F	/* key can sign RR's of same name */
    369 #define	NS_KEY_RESERVED_BITMASK ( NS_KEY_RESERVED2 | \
    370 				  NS_KEY_RESERVED4 | \
    371 				  NS_KEY_RESERVED5 | \
    372 				  NS_KEY_RESERVED8 | \
    373 				  NS_KEY_RESERVED9 | \
    374 				  NS_KEY_RESERVED10 | \
    375 				  NS_KEY_RESERVED11 )
    376 #define NS_KEY_RESERVED_BITMASK2 0xFFFF /* no bits defined here */
    377 
    378 /* The Algorithm field of the KEY and SIG RR's is an integer, {1..254} */
    379 #define	NS_ALG_MD5RSA		1	/* MD5 with RSA */
    380 #define	NS_ALG_DH               2	/* Diffie Hellman KEY */
    381 #define	NS_ALG_DSA              3	/* DSA KEY */
    382 #define	NS_ALG_DSS              NS_ALG_DSA
    383 #define	NS_ALG_EXPIRE_ONLY	253	/* No alg, no security */
    384 #define	NS_ALG_PRIVATE_OID	254	/* Key begins with OID giving alg */
    385 
    386 /* Protocol values  */
    387 /* value 0 is reserved */
    388 #define NS_KEY_PROT_TLS         1
    389 #define NS_KEY_PROT_EMAIL       2
    390 #define NS_KEY_PROT_DNSSEC      3
    391 #define NS_KEY_PROT_IPSEC       4
    392 #define NS_KEY_PROT_ANY		255
    393 
    394 /* Signatures */
    395 #define	NS_MD5RSA_MIN_BITS	 512	/* Size of a mod or exp in bits */
    396 #define	NS_MD5RSA_MAX_BITS	4096
    397 	/* Total of binary mod and exp */
    398 #define	NS_MD5RSA_MAX_BYTES	((NS_MD5RSA_MAX_BITS+7/8)*2+3)
    399 	/* Max length of text sig block */
    400 #define	NS_MD5RSA_MAX_BASE64	(((NS_MD5RSA_MAX_BYTES+2)/3)*4)
    401 #define NS_MD5RSA_MIN_SIZE	((NS_MD5RSA_MIN_BITS+7)/8)
    402 #define NS_MD5RSA_MAX_SIZE	((NS_MD5RSA_MAX_BITS+7)/8)
    403 
    404 #define NS_DSA_SIG_SIZE         41
    405 #define NS_DSA_MIN_SIZE         213
    406 #define NS_DSA_MAX_BYTES        405
    407 
    408 /* Offsets into SIG record rdata to find various values */
    409 #define	NS_SIG_TYPE	0	/* Type flags */
    410 #define	NS_SIG_ALG	2	/* Algorithm */
    411 #define	NS_SIG_LABELS	3	/* How many labels in name */
    412 #define	NS_SIG_OTTL	4	/* Original TTL */
    413 #define	NS_SIG_EXPIR	8	/* Expiration time */
    414 #define	NS_SIG_SIGNED	12	/* Signature time */
    415 #define	NS_SIG_FOOT	16	/* Key footprint */
    416 #define	NS_SIG_SIGNER	18	/* Domain name of who signed it */
    417 
    418 /* How RR types are represented as bit-flags in NXT records */
    419 #define	NS_NXT_BITS 8
    420 #define	NS_NXT_BIT_SET(  n,p) (p[(n)/NS_NXT_BITS] |=  (0x80>>((n)%NS_NXT_BITS)))
    421 #define	NS_NXT_BIT_CLEAR(n,p) (p[(n)/NS_NXT_BITS] &= ~(0x80>>((n)%NS_NXT_BITS)))
    422 #define	NS_NXT_BIT_ISSET(n,p) (p[(n)/NS_NXT_BITS] &   (0x80>>((n)%NS_NXT_BITS)))
    423 #define NS_NXT_MAX 127
    424 
    425 /*
    426  * EDNS0 extended flags, host order.
    427  */
    428 #define NS_OPT_DNSSEC_OK	0x8000U
    429 
    430 /*
    431  * Inline versions of get/put short/long.  Pointer is advanced.
    432  */
    433 #define NS_GET16(s, cp) do { \
    434 	const u_char *t_cp = (const u_char *)(cp); \
    435 	(s) = ((uint16_t)t_cp[0] << 8) \
    436 	    | ((uint16_t)t_cp[1]) \
    437 	    ; \
    438 	(cp) += NS_INT16SZ; \
    439 } while (/*CONSTCOND*/0)
    440 
    441 #define NS_GET32(l, cp) do { \
    442 	const u_char *t_cp = (const u_char *)(cp); \
    443 	(l) = ((uint32_t)t_cp[0] << 24) \
    444 	    | ((uint32_t)t_cp[1] << 16) \
    445 	    | ((uint32_t)t_cp[2] << 8) \
    446 	    | ((uint32_t)t_cp[3]) \
    447 	    ; \
    448 	(cp) += NS_INT32SZ; \
    449 } while (/*CONSTCOND*/0)
    450 
    451 #define NS_PUT16(s, cp) do { \
    452 	uint32_t t_s = (uint32_t)(s); \
    453 	u_char *t_cp = (u_char *)(cp); \
    454 	*t_cp++ = t_s >> 8; \
    455 	*t_cp   = t_s; \
    456 	(cp) += NS_INT16SZ; \
    457 } while (/*CONSTCOND*/0)
    458 
    459 #define NS_PUT32(l, cp) do { \
    460 	uint32_t t_l = (uint32_t)(l); \
    461 	u_char *t_cp = (u_char *)(cp); \
    462 	*t_cp++ = t_l >> 24; \
    463 	*t_cp++ = t_l >> 16; \
    464 	*t_cp++ = t_l >> 8; \
    465 	*t_cp   = t_l; \
    466 	(cp) += NS_INT32SZ; \
    467 } while (/*CONSTCOND*/0)
    468 
    469 /*
    470  * ANSI C identifier hiding for bind's lib/nameser.
    471  */
    472 #define	ns_msg_getflag		__ns_msg_getflag
    473 #define ns_get16		__ns_get16
    474 #define ns_get32		__ns_get32
    475 #define ns_put16		__ns_put16
    476 #define ns_put32		__ns_put32
    477 #define ns_initparse		__ns_initparse
    478 #define ns_skiprr		__ns_skiprr
    479 #define ns_parserr		__ns_parserr
    480 #define	ns_sprintrr		__ns_sprintrr
    481 #define	ns_sprintrrf		__ns_sprintrrf
    482 #define	ns_format_ttl		__ns_format_ttl
    483 #define	ns_parse_ttl		__ns_parse_ttl
    484 #define ns_datetosecs		__ns_datetosecs
    485 #define	ns_name_ntol		__ns_name_ntol
    486 #define	ns_name_ntop		__ns_name_ntop
    487 #define	ns_name_pton		__ns_name_pton
    488 #define	ns_name_unpack		__ns_name_unpack
    489 #define	ns_name_pack		__ns_name_pack
    490 #define	ns_name_compress	__ns_name_compress
    491 #define	ns_name_uncompress	__ns_name_uncompress
    492 #define	ns_name_skip		__ns_name_skip
    493 #define	ns_name_rollback	__ns_name_rollback
    494 #define	ns_sign			__ns_sign
    495 #define	ns_sign2		__ns_sign2
    496 #define	ns_sign_tcp		__ns_sign_tcp
    497 #define	ns_sign_tcp2		__ns_sign_tcp2
    498 #define	ns_sign_tcp_init	__ns_sign_tcp_init
    499 #define ns_find_tsig		__ns_find_tsig
    500 #define	ns_verify		__ns_verify
    501 #define	ns_verify_tcp		__ns_verify_tcp
    502 #define	ns_verify_tcp_init	__ns_verify_tcp_init
    503 #define	ns_samedomain		__ns_samedomain
    504 #define	ns_subdomain		__ns_subdomain
    505 #define	ns_makecanon		__ns_makecanon
    506 #define	ns_samename		__ns_samename
    507 
    508 __BEGIN_DECLS
    509 int		ns_msg_getflag(ns_msg, int);
    510 uint16_t	ns_get16(const u_char *);
    511 uint32_t	ns_get32(const u_char *);
    512 void		ns_put16(uint16_t, u_char *);
    513 void		ns_put32(uint32_t, u_char *);
    514 int		ns_initparse(const u_char *, int, ns_msg *);
    515 int		ns_skiprr(const u_char *, const u_char *, ns_sect, int);
    516 int		ns_parserr(ns_msg *, ns_sect, int, ns_rr *);
    517 int		ns_sprintrr(const ns_msg *, const ns_rr *,
    518 				 const char *, const char *, char *, size_t);
    519 int		ns_sprintrrf(const u_char *, size_t, const char *,
    520 				  ns_class, ns_type, u_long, const u_char *,
    521 				  size_t, const char *, const char *,
    522 				  char *, size_t);
    523 int		ns_format_ttl(u_long, char *, size_t);
    524 int		ns_parse_ttl(const char *, u_long *);
    525 uint32_t	ns_datetosecs(const char *cp, int *errp);
    526 int		ns_name_ntol(const u_char *, u_char *, size_t);
    527 int		ns_name_ntop(const u_char *, char *, size_t);
    528 int		ns_name_pton(const char *, u_char *, size_t);
    529 int		ns_name_unpack(const u_char *, const u_char *,
    530 				    const u_char *, u_char *, size_t);
    531 int		ns_name_pack(const u_char *, u_char *, int,
    532 				  const u_char **, const u_char **);
    533 int		ns_name_uncompress(const u_char *, const u_char *,
    534 					const u_char *, char *, size_t);
    535 int		ns_name_compress(const char *, u_char *, size_t,
    536 				      const u_char **, const u_char **);
    537 int		ns_name_skip(const u_char **, const u_char *);
    538 void		ns_name_rollback(const u_char *, const u_char **,
    539 				      const u_char **);
    540 int		ns_sign(u_char *, int *, int, int, void *,
    541 			     const u_char *, int, u_char *, int *, time_t);
    542 int		ns_sign2(u_char *, int *, int, int, void *,
    543 			      const u_char *, int, u_char *, int *, time_t,
    544 			      u_char **, u_char **);
    545 int		ns_sign_tcp(u_char *, int *, int, int,
    546 				 ns_tcp_tsig_state *, int);
    547 int		ns_sign_tcp2(u_char *, int *, int, int,
    548 				  ns_tcp_tsig_state *, int,
    549 				  u_char **, u_char **);
    550 int		ns_sign_tcp_init(void *, const u_char *, int,
    551 					ns_tcp_tsig_state *);
    552 u_char		*ns_find_tsig(u_char *, u_char *);
    553 int		ns_verify(u_char *, int *, void *,
    554 			       const u_char *, int, u_char *, int *,
    555 			       time_t *, int);
    556 int		ns_verify_tcp(u_char *, int *, ns_tcp_tsig_state *, int);
    557 int		ns_verify_tcp_init(void *, const u_char *, int,
    558 					ns_tcp_tsig_state *);
    559 int		ns_samedomain(const char *, const char *);
    560 int		ns_subdomain(const char *, const char *);
    561 int		ns_makecanon(const char *, char *, size_t);
    562 int		ns_samename(const char *, const char *);
    563 __END_DECLS
    564 
    565 #ifdef BIND_4_COMPAT
    566 #include "arpa_nameser_compat.h"
    567 #endif
    568 
    569 #if 0
    570 #  include <logd.h>
    571 #  define  XLOG(...)   \
    572     __libc_android_log_print(ANDROID_LOG_DEBUG,"libc",__VA_ARGS__)
    573 #else
    574 #define  XLOG(...)   do {} while (0)
    575 #endif
    576 
    577 #endif /* !_ARPA_NAMESER_H_ */
    578