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      1 /*
      2  * Copyright 2003 Sun Microsystems, Inc.  All rights reserved.
      3  * Use is subject to license terms.
      4  */
      5 
      6 /*
      7  * Copyright (c) 1983, 1989, 1993
      8  *    The Regents of the University of California.  All rights reserved.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  * 	This product includes software developed by the University of
     21  * 	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 /*
     40  * Copyright (c) 1996-1999 by Internet Software Consortium.
     41  *
     42  * Permission to use, copy, modify, and distribute this software for any
     43  * purpose with or without fee is hereby granted, provided that the above
     44  * copyright notice and this permission notice appear in all copies.
     45  *
     46  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
     47  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
     48  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
     49  * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
     50  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
     51  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
     52  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
     53  * SOFTWARE.
     54  */
     55 
     56 /*
     57  *	$Id: nameser.h,v 8.50 2003/05/27 23:36:52 marka Exp $
     58  */
     59 
     60 #ifndef _ARPA_NAMESER_H
     61 #define	_ARPA_NAMESER_H
     62 
     63 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     64 
     65 #include <sys/isa_defs.h>
     66 
     67 
     68 #ifdef	__cplusplus
     69 extern "C" {
     70 #endif
     71 
     72 #define	BIND_4_COMPAT
     73 
     74 /*
     75  * Revision information.  This is the release date in YYYYMMDD format.
     76  * It can change every day so the right thing to do with it is use it
     77  * in preprocessor commands such as "#if (__NAMESER > 19931104)".  Do not
     78  * compare for equality; rather, use it to determine whether your libresolv
     79  * contains a new enough lib/nameser/ to support the feature you need.
     80  */
     81 
     82 #define	__NAMESER	19991006	/* New interface version stamp. */
     83 
     84 /*
     85  * Define constants based on RFC 883, RFC 1034, RFC 1035
     86  */
     87 #define	NS_PACKETSZ	512	/* default UDP packet size */
     88 #define	NS_MAXDNAME	1025	/* maximum domain name */
     89 #define	NS_MAXMSG	65535	/* maximum message size */
     90 #define	NS_MAXCDNAME	255	/* maximum compressed domain name */
     91 #define	NS_MAXLABEL	63	/* maximum length of domain label */
     92 #define	NS_HFIXEDSZ	12	/* #/bytes of fixed data in header */
     93 #define	NS_QFIXEDSZ	4	/* #/bytes of fixed data in query */
     94 #define	NS_RRFIXEDSZ	10	/* #/bytes of fixed data in r record */
     95 #define	NS_INT32SZ	4	/* #/bytes of data in a u_int32_t */
     96 #define	NS_INT16SZ	2	/* #/bytes of data in a u_int16_t */
     97 #define	NS_INT8SZ	1	/* #/bytes of data in a u_int8_t */
     98 #define	NS_INADDRSZ	4	/* IPv4 T_A */
     99 #define	NS_IN6ADDRSZ	16	/* IPv6 T_AAAA */
    100 #define	NS_CMPRSFLGS	0xc0	/* Flag bits indicating name compression. */
    101 #define	NS_DEFAULTPORT	53	/* For both TCP and UDP. */
    102 
    103 /*
    104  * These can be expanded with synonyms, just keep ns_parse.c:ns_parserecord()
    105  * in synch with it.
    106  */
    107 typedef enum __ns_sect {
    108 	ns_s_qd = 0,		/* Query: Question. */
    109 	ns_s_zn = 0,		/* Update: Zone. */
    110 	ns_s_an = 1,		/* Query: Answer. */
    111 	ns_s_pr = 1,		/* Update: Prerequisites. */
    112 	ns_s_ns = 2,		/* Query: Name servers. */
    113 	ns_s_ud = 2,		/* Update: Update. */
    114 	ns_s_ar = 3,		/* Query|Update: Additional records. */
    115 	ns_s_max = 4
    116 } ns_sect;
    117 
    118 /*
    119  * This is a message handle.  It is caller allocated and has no dynamic data.
    120  * This structure is intended to be opaque to all but ns_parse.c, thus the
    121  * leading _'s on the member names.  Use the accessor functions, not the _'s.
    122  */
    123 typedef struct __ns_msg {
    124 	const uchar_t	*_msg, *_eom;
    125 	uint16_t	_id, _flags, _counts[ns_s_max];
    126 	const uchar_t	*_sections[ns_s_max];
    127 	ns_sect		_sect;
    128 	int		_rrnum;
    129 	const uchar_t	*_msg_ptr;
    130 } ns_msg;
    131 
    132 /* Private data structure - do not use from outside library. */
    133 struct _ns_flagdata {  int mask, shift;  };
    134 extern struct _ns_flagdata _ns_flagdata[];
    135 
    136 /* Accessor macros - this is part of the public interface. */
    137 #define	ns_msg_id(handle) ((handle)._id + 0)
    138 #define	ns_msg_base(handle) ((handle)._msg + 0)
    139 #define	ns_msg_end(handle) ((handle)._eom + 0)
    140 #define	ns_msg_size(handle) ((handle)._eom - (handle)._msg)
    141 #define	ns_msg_count(handle, section) ((handle)._counts[section] + 0)
    142 
    143 /*
    144  * This is a parsed record.  It is caller allocated and has no dynamic data.
    145  */
    146 typedef	struct __ns_rr {
    147 	char		name[NS_MAXDNAME];
    148 	uint16_t	type;
    149 	uint16_t	rr_class;
    150 	uint32_t	ttl;
    151 	uint16_t	rdlength;
    152 	const uchar_t	*rdata;
    153 } ns_rr;
    154 
    155 /* Accessor macros - this is part of the public interface. */
    156 #define	ns_rr_name(rr)	(((rr).name[0] != '\0') ? (rr).name : ".")
    157 #define	ns_rr_type(rr)	((ns_type)((rr).type + 0))
    158 #define	ns_rr_class(rr)	((ns_class)((rr).rr_class + 0))
    159 #define	ns_rr_ttl(rr)	((rr).ttl + 0)
    160 #define	ns_rr_rdlen(rr)	((rr).rdlength + 0)
    161 #define	ns_rr_rdata(rr)	((rr).rdata + 0)
    162 
    163 /*
    164  * These don't have to be in the same order as in the packet flags word,
    165  * and they can even overlap in some cases, but they will need to be kept
    166  * in synch with ns_parse.c:ns_flagdata[].
    167  */
    168 typedef enum __ns_flag {
    169 	ns_f_qr,		/* Question/Response. */
    170 	ns_f_opcode,		/* Operation code. */
    171 	ns_f_aa,		/* Authoritative Answer. */
    172 	ns_f_tc,		/* Truncation occurred. */
    173 	ns_f_rd,		/* Recursion Desired. */
    174 	ns_f_ra,		/* Recursion Available. */
    175 	ns_f_z,			/* MBZ. */
    176 	ns_f_ad,		/* Authentic Data (DNSSEC). */
    177 	ns_f_cd,		/* Checking Disabled (DNSSEC). */
    178 	ns_f_rcode,		/* Response code. */
    179 	ns_f_max
    180 } ns_flag;
    181 
    182 /*
    183  * Currently defined opcodes.
    184  */
    185 typedef enum __ns_opcode {
    186 	ns_o_query = 0,		/* Standard query. */
    187 	ns_o_iquery = 1,	/* Inverse query (deprecated/unsupported). */
    188 	ns_o_status = 2,	/* Name server status query (unsupported). */
    189 				/* Opcode 3 is undefined/reserved. */
    190 	ns_o_notify = 4,	/* Zone change notification. */
    191 	ns_o_update = 5,	/* Zone update message. */
    192 	ns_o_max = 6
    193 } ns_opcode;
    194 
    195 /*
    196  * Currently defined response codes.
    197  */
    198 typedef	enum __ns_rcode {
    199 	ns_r_noerror = 0,	/* No error occurred. */
    200 	ns_r_formerr = 1,	/* Format error. */
    201 	ns_r_servfail = 2,	/* Server failure. */
    202 	ns_r_nxdomain = 3,	/* Name error. */
    203 	ns_r_notimpl = 4,	/* Unimplemented. */
    204 	ns_r_refused = 5,	/* Operation refused. */
    205 	/* these are for BIND_UPDATE */
    206 	ns_r_yxdomain = 6,	/* Name exists */
    207 	ns_r_yxrrset = 7,	/* RRset exists */
    208 	ns_r_nxrrset = 8,	/* RRset does not exist */
    209 	ns_r_notauth = 9,	/* Not authoritative for zone */
    210 	ns_r_notzone = 10,	/* Zone of record different from zone section */
    211 	ns_r_max = 11,
    212 	/* The following are EDNS extended rcodes */
    213 	ns_r_badvers = 16,
    214 	/* The following are TSIG errors */
    215 	ns_r_badsig = 16,
    216 	ns_r_badkey = 17,
    217 	ns_r_badtime = 18
    218 } ns_rcode;
    219 
    220 /* BIND_UPDATE */
    221 typedef enum __ns_update_operation {
    222 	ns_uop_delete = 0,
    223 	ns_uop_add = 1,
    224 	ns_uop_max = 2
    225 } ns_update_operation;
    226 
    227 /*
    228  * This RR-like structure is particular to UPDATE.
    229  */
    230 struct ns_updrec {
    231 	struct ns_updrec *r_prev;	/* prev record */
    232 	struct ns_updrec *r_next;	/* next record */
    233 	uint8_t	r_section;	/* ZONE/PREREQUISITE/UPDATE */
    234 	char		*r_dname;	/* owner of the RR */
    235 	uint16_t	r_class;	/* class number */
    236 	uint16_t	r_type;		/* type number */
    237 	uint32_t	r_ttl;		/* time to live */
    238 	uchar_t		*r_data;	/* rdata fields as text string */
    239 	uint16_t	r_size;		/* size of r_data field */
    240 	int		r_opcode;	/* type of operation */
    241 	/* following fields for private use by the resolver/server routines */
    242 	struct ns_updrec *r_grpnext;	/* next record when grouped */
    243 	struct databuf *r_dp;		/* databuf to process */
    244 	struct databuf *r_deldp;	/* databuf's deleted/overwritten */
    245 	uint16_t	r_zone;		/* zone number on server */
    246 };
    247 typedef struct ns_updrec ns_updrec;
    248 
    249 /*
    250  * This structure is used for TSIG authenticated messages
    251  */
    252 struct ns_tsig_key {
    253 		char name[NS_MAXDNAME], alg[NS_MAXDNAME];
    254 		unsigned char *data;
    255 		int len;
    256 };
    257 typedef struct ns_tsig_key ns_tsig_key;
    258 
    259 /*
    260  * This structure is used for TSIG authenticated TCP messages
    261  */
    262 struct ns_tcp_tsig_state {
    263 	int counter;
    264 	struct dst_key *key;
    265 	void *ctx;
    266 	unsigned char sig[NS_PACKETSZ];
    267 	int siglen;
    268 };
    269 typedef struct ns_tcp_tsig_state ns_tcp_tsig_state;
    270 
    271 #define	NS_TSIG_FUDGE 300
    272 #define	NS_TSIG_TCP_COUNT 100
    273 #define	NS_TSIG_ALG_HMAC_MD5 "HMAC-MD5.SIG-ALG.REG.INT"
    274 
    275 #define	NS_TSIG_ERROR_NO_TSIG -10
    276 #define	NS_TSIG_ERROR_NO_SPACE -11
    277 #define	NS_TSIG_ERROR_FORMERR -12
    278 
    279 /*
    280  * Currently defined type values for resources and queries.
    281  */
    282 typedef enum __ns_type {
    283 	ns_t_invalid = 0,	/* Cookie. */
    284 	ns_t_a = 1,		/* Host address. */
    285 	ns_t_ns = 2,		/* Authoritative server. */
    286 	ns_t_md = 3,		/* Mail destination. */
    287 	ns_t_mf = 4,		/* Mail forwarder. */
    288 	ns_t_cname = 5,		/* Canonical name. */
    289 	ns_t_soa = 6,		/* Start of authority zone. */
    290 	ns_t_mb = 7,		/* Mailbox domain name. */
    291 	ns_t_mg = 8,		/* Mail group member. */
    292 	ns_t_mr = 9,		/* Mail rename name. */
    293 	ns_t_null = 10,		/* Null resource record. */
    294 	ns_t_wks = 11,		/* Well known service. */
    295 	ns_t_ptr = 12,		/* Domain name pointer. */
    296 	ns_t_hinfo = 13,	/* Host information. */
    297 	ns_t_minfo = 14,	/* Mailbox information. */
    298 	ns_t_mx = 15,		/* Mail routing information. */
    299 	ns_t_txt = 16,		/* Text strings. */
    300 	ns_t_rp = 17,		/* Responsible person. */
    301 	ns_t_afsdb = 18,	/* AFS cell database. */
    302 	ns_t_x25 = 19,		/* X_25 calling address. */
    303 	ns_t_isdn = 20,		/* ISDN calling address. */
    304 	ns_t_rt = 21,		/* Router. */
    305 	ns_t_nsap = 22,		/* NSAP address. */
    306 	ns_t_nsap_ptr = 23,	/* Reverse NSAP lookup (deprecated). */
    307 	ns_t_sig = 24,		/* Security signature. */
    308 	ns_t_key = 25,		/* Security key. */
    309 	ns_t_px = 26,		/* X.400 mail mapping. */
    310 	ns_t_gpos = 27,		/* Geographical position (withdrawn). */
    311 	ns_t_aaaa = 28,		/* IPv6 Address. */
    312 	ns_t_loc = 29,		/* Location Information. */
    313 	ns_t_nxt = 30,		/* Next domain (security). */
    314 	ns_t_eid = 31,		/* Endpoint identifier. */
    315 	ns_t_nimloc = 32,	/* Nimrod Locator. */
    316 	ns_t_srv = 33,		/* Server Selection. */
    317 	ns_t_atma = 34,		/* ATM Address */
    318 	ns_t_naptr = 35,	/* Naming Authority PoinTeR */
    319 	ns_t_kx = 36,		/* Key Exchange */
    320 	ns_t_cert = 37,		/* Certification record */
    321 	ns_t_a6 = 38,		/* IPv6 address (deprecated) */
    322 	ns_t_dname = 39,	/* Non-terminal DNAME (for IPv6) */
    323 	ns_t_sink = 40,		/* Kitchen sink (experimentatl) */
    324 	ns_t_opt = 41,		/* EDNS0 option (meta-RR) */
    325 	ns_t_apl = 42,		/* Address prefix list (RFC 3123) */
    326 	ns_t_tkey = 249,	/* Transaction key */
    327 	ns_t_tsig = 250,	/* Transaction signature. */
    328 	ns_t_ixfr = 251,	/* Incremental zone transfer. */
    329 	ns_t_axfr = 252,	/* Transfer zone of authority. */
    330 	ns_t_mailb = 253,	/* Transfer mailbox records. */
    331 	ns_t_maila = 254,	/* Transfer mail agent records. */
    332 	ns_t_any = 255,		/* Wildcard match. */
    333 	ns_t_zxfr = 256,	/* BIND-specific, nonstandard. */
    334 	ns_t_max = 65536
    335 } ns_type;
    336 
    337 /* Exclusively a QTYPE? (not also an RTYPE) */
    338 #define	ns_t_qt_p(t) (ns_t_xfr_p(t) || (t) == ns_t_any || \
    339 		(t) == ns_t_mailb || (t) == ns_t_maila)
    340 /* Some kind of meta-RR? (not a QTYPE, but also not an RTYPE) */
    341 #define	ns_t_mrr_p(t) ((t) == ns_t_tsig || (t) == ns_t_opt)
    342 /* Exclusively an RTYPE? (not also a QTYPE or a meta-RR) */
    343 #define	ns_t_rr_p(t) (!ns_t_qt_p(t) && !ns_t_mrr_p(t))
    344 #define	ns_t_udp_p(t) ((t) != ns_t_axfr && (t) != ns_t_zxfr)
    345 #define	ns_t_xfr_p(t) ((t) == ns_t_axfr || (t) == ns_t_ixfr || \
    346 		(t) == ns_t_zxfr)
    347 
    348 /*
    349  * Values for class field
    350  */
    351 typedef enum __ns_class {
    352 	ns_c_invalid = 0,	/* Cookie. */
    353 	ns_c_in = 1,		/* Internet. */
    354 	ns_c_2 = 2,		/* unallocated/unsupported. */
    355 	ns_c_chaos = 3,		/* MIT Chaos-net. */
    356 	ns_c_hs = 4,		/* MIT Hesiod. */
    357 	/* Query class values which do not appear in resource records */
    358 	ns_c_none = 254,	/* for prereq. sections in update requests */
    359 	ns_c_any = 255,		/* Wildcard match. */
    360 	ns_c_max = 65536
    361 } ns_class;
    362 
    363 /* DNSSEC constants. */
    364 
    365 typedef enum __ns_key_types {
    366 	ns_kt_rsa = 1,		/* key type RSA/MD5 */
    367 	ns_kt_dh  = 2,		/* Diffie Hellman */
    368 	ns_kt_dsa = 3,		/* Digital Signature Standard (MANDATORY) */
    369 	ns_kt_private = 254	/* Private key type starts with OID */
    370 } ns_key_types;
    371 
    372 typedef enum __ns_cert_types {
    373 	cert_t_pkix = 1,	/* PKIX (X.509v3) */
    374 	cert_t_spki = 2,	/* SPKI */
    375 	cert_t_pgp  = 3,	/* PGP */
    376 	cert_t_url  = 253,	/* URL private type */
    377 	cert_t_oid  = 254	/* OID private type */
    378 } ns_cert_types;
    379 
    380 /* Flags field of the KEY RR rdata. */
    381 #define	NS_KEY_TYPEMASK		0xC000	/* Mask for "type" bits */
    382 #define	NS_KEY_TYPE_AUTH_CONF	0x0000	/* Key usable for both */
    383 #define	NS_KEY_TYPE_CONF_ONLY	0x8000	/* Key usable for confidentiality */
    384 #define	NS_KEY_TYPE_AUTH_ONLY	0x4000	/* Key usable for authentication */
    385 #define	NS_KEY_TYPE_NO_KEY	0xC000	/* No key usable for either; no key */
    386 /* The type bits can also be interpreted independently, as single bits: */
    387 #define	NS_KEY_NO_AUTH		0x8000	/* Key unusable for authentication */
    388 #define	NS_KEY_NO_CONF		0x4000	/* Key unusable for confidentiality */
    389 #define	NS_KEY_RESERVED2	0x2000	/* Security is *mandatory* if bit=0 */
    390 #define	NS_KEY_EXTENDED_FLAGS	0x1000	/* reserved - must be zero */
    391 #define	NS_KEY_RESERVED4	0x0800  /* reserved - must be zero */
    392 #define	NS_KEY_RESERVED5	0x0400  /* reserved - must be zero */
    393 #define	NS_KEY_NAME_TYPE	0x0300	/* these bits determine the type */
    394 #define	NS_KEY_NAME_USER	0x0000	/* key is assoc. with user */
    395 #define	NS_KEY_NAME_ENTITY	0x0200	/* key is assoc. with entity eg host */
    396 #define	NS_KEY_NAME_ZONE	0x0100	/* key is zone key */
    397 #define	NS_KEY_NAME_RESERVED	0x0300	/* reserved meaning */
    398 #define	NS_KEY_RESERVED8	0x0080  /* reserved - must be zero */
    399 #define	NS_KEY_RESERVED9	0x0040  /* reserved - must be zero */
    400 #define	NS_KEY_RESERVED10	0x0020  /* reserved - must be zero */
    401 #define	NS_KEY_RESERVED11	0x0010  /* reserved - must be zero */
    402 #define	NS_KEY_SIGNATORYMASK	0x000F	/* key can sign RR's of same name */
    403 #define	NS_KEY_RESERVED_BITMASK (NS_KEY_RESERVED2 | \
    404     NS_KEY_RESERVED4 | \
    405     NS_KEY_RESERVED5 | \
    406     NS_KEY_RESERVED8 | \
    407     NS_KEY_RESERVED9 | \
    408     NS_KEY_RESERVED10 | \
    409     NS_KEY_RESERVED11)
    410 #define	NS_KEY_RESERVED_BITMASK2	0xFFFF /* no bits defined here */
    411 
    412 /* The Algorithm field of the KEY and SIG RR's is an integer, {1..254} */
    413 #define	NS_ALG_MD5RSA		1	/* MD5 with RSA */
    414 #define	NS_ALG_DH		2	/* Diffie Hellman KEY */
    415 #define	NS_ALG_DSA		3	/* DSA KEY */
    416 #define	NS_ALG_DSS		NS_ALG_DSA
    417 #define	NS_ALG_EXPIRE_ONLY	253	/* No alg, no security */
    418 #define	NS_ALG_PRIVATE_OID	254	/* Key begins with OID giving alg */
    419 
    420 /* Protocol values  */
    421 /* value 0 is reserved */
    422 #define	NS_KEY_PROT_TLS		1
    423 #define	NS_KEY_PROT_EMAIL	2
    424 #define	NS_KEY_PROT_DNSSEC	3
    425 #define	NS_KEY_PROT_IPSEC	4
    426 #define	NS_KEY_PROT_ANY		255
    427 
    428 /* Signatures */
    429 #define	NS_MD5RSA_MIN_BITS	 512	/* Size of a mod or exp in bits */
    430 #define	NS_MD5RSA_MAX_BITS	4096
    431 	/* Total of binary mod and exp */
    432 #define	NS_MD5RSA_MAX_BYTES	((NS_MD5RSA_MAX_BITS+7/8)*2+3)
    433 	/* Max length of text sig block */
    434 #define	NS_MD5RSA_MAX_BASE64	(((NS_MD5RSA_MAX_BYTES+2)/3)*4)
    435 #define	NS_MD5RSA_MIN_SIZE	((NS_MD5RSA_MIN_BITS+7)/8)
    436 #define	NS_MD5RSA_MAX_SIZE	((NS_MD5RSA_MAX_BITS+7)/8)
    437 
    438 #define	NS_DSA_SIG_SIZE		41
    439 #define	NS_DSA_MIN_SIZE		213
    440 #define	NS_DSA_MAX_BYTES	405
    441 
    442 /* Offsets into SIG record rdata to find various values */
    443 #define	NS_SIG_TYPE	0	/* Type flags */
    444 #define	NS_SIG_ALG	2	/* Algorithm */
    445 #define	NS_SIG_LABELS	3	/* How many labels in name */
    446 #define	NS_SIG_OTTL	4	/* Original TTL */
    447 #define	NS_SIG_EXPIR	8	/* Expiration time */
    448 #define	NS_SIG_SIGNED	12	/* Signature time */
    449 #define	NS_SIG_FOOT	16	/* Key footprint */
    450 #define	NS_SIG_SIGNER	18	/* Domain name of who signed it */
    451 
    452 /* How RR types are represented as bit-flags in NXT records */
    453 #define	NS_NXT_BITS 8
    454 #define	NS_NXT_BIT_SET(n, p) \
    455 	(p[(n)/NS_NXT_BITS] |=  (0x80>>((n)%NS_NXT_BITS)))
    456 #define	NS_NXT_BIT_CLEAR(n, p) \
    457 	(p[(n)/NS_NXT_BITS] &= ~(0x80>>((n)%NS_NXT_BITS)))
    458 #define	NS_NXT_BIT_ISSET(n, p) \
    459 	(p[(n)/NS_NXT_BITS] &   (0x80>>((n)%NS_NXT_BITS)))
    460 #define	NS_NXT_MAX	127
    461 
    462 /*
    463  * EDNS0 extended flags, host order.
    464  */
    465 #define	NS_OPT_DNSSEC_OK	0x8000U
    466 
    467 /*
    468  * Inline versions of get/put short/long.  Pointer is advanced.
    469  */
    470 #define	NS_GET16(s, cp) do { \
    471 	register const uchar_t *t_cp = (const uchar_t *)(cp); \
    472 	(s) = ((uint16_t)t_cp[0] << 8) \
    473 	    | ((uint16_t)t_cp[1]) \
    474 	; \
    475 	(cp) += NS_INT16SZ; \
    476 } while (0)
    477 
    478 #define	NS_GET32(l, cp) do { \
    479 	register const uchar_t *t_cp = (const uchar_t *)(cp); \
    480 	(l) = ((uint32_t)t_cp[0] << 24) \
    481 	    | ((uint32_t)t_cp[1] << 16) \
    482 	    | ((uint32_t)t_cp[2] << 8) \
    483 	    | ((uint32_t)t_cp[3]) \
    484 	; \
    485 	(cp) += NS_INT32SZ; \
    486 } while (0)
    487 
    488 #define	NS_PUT16(s, cp) do { \
    489 	register uint16_t t_s = (uint16_t)(s); \
    490 	register uchar_t *t_cp = (uchar_t *)(cp); \
    491 	*t_cp++ = t_s >> 8; \
    492 	*t_cp   = t_s; \
    493 	(cp) += NS_INT16SZ; \
    494 } while (0)
    495 
    496 #define	NS_PUT32(l, cp) do { \
    497 	register uint32_t t_l = (uint32_t)(l); \
    498 	register uchar_t *t_cp = (uchar_t *)(cp); \
    499 	*t_cp++ = t_l >> 24; \
    500 	*t_cp++ = t_l >> 16; \
    501 	*t_cp++ = t_l >> 8; \
    502 	*t_cp   = t_l; \
    503 	(cp) += NS_INT32SZ; \
    504 } while (0)
    505 
    506 /*
    507  * ANSI C identifier hiding.
    508  */
    509 #define	ns_msg_getflag		__ns_msg_getflag
    510 #define	ns_get16		__ns_get16
    511 #define	ns_get32		__ns_get32
    512 #define	ns_put16		__ns_put16
    513 #define	ns_put32		__ns_put32
    514 #define	ns_initparse		__ns_initparse
    515 #define	ns_skiprr		__ns_skiprr
    516 #define	ns_parserr		__ns_parserr
    517 #define	ns_sprintrr		__ns_sprintrr
    518 #define	ns_sprintrrf		__ns_sprintrrf
    519 #define	ns_format_ttl		__ns_format_ttl
    520 #define	ns_parse_ttl		__ns_parse_ttl
    521 #define	ns_datetosecs		__ns_datetosecs
    522 #define	ns_name_ntol		__ns_name_ntol
    523 #define	ns_name_ntop		__ns_name_ntop
    524 #define	ns_name_pton		__ns_name_pton
    525 #define	ns_name_unpack		__ns_name_unpack
    526 #define	ns_name_pack		__ns_name_pack
    527 #define	ns_name_compress	__ns_name_compress
    528 #define	ns_name_uncompress	__ns_name_uncompress
    529 #define	ns_name_skip		__ns_name_skip
    530 #define	ns_name_rollback	__ns_name_rollback
    531 #define	ns_sign			__ns_sign
    532 #define	ns_sign2		__ns_sign2
    533 #define	ns_sign_tcp		__ns_sign_tcp
    534 #define	ns_sign_tcp2		__ns_sign_tcp2
    535 #define	ns_sign_tcp_init	__ns_sign_tcp_init
    536 #define	ns_find_tsig		__ns_find_tsig
    537 #define	ns_verify		__ns_verify
    538 #define	ns_verify_tcp		__ns_verify_tcp
    539 #define	ns_verify_tcp_init	__ns_verify_tcp_init
    540 #define	ns_samedomain		__ns_samedomain
    541 #define	ns_subdomain		__ns_subdomain
    542 #define	ns_makecanon		__ns_makecanon
    543 #define	ns_samename		__ns_samename
    544 
    545 int		ns_msg_getflag(ns_msg, int);
    546 uint_t		ns_get16(const uchar_t *);
    547 ulong_t		ns_get32(const uchar_t *);
    548 void		ns_put16(uint_t, uchar_t *);
    549 void		ns_put32(ulong_t, uchar_t *);
    550 int		ns_initparse(const uchar_t *, int, ns_msg *);
    551 int		ns_skiprr(const uchar_t *, const uchar_t *, ns_sect, int);
    552 int		ns_parserr(ns_msg *, ns_sect, int, ns_rr *);
    553 int		ns_sprintrr(const ns_msg *, const ns_rr *,
    554     const char *, const char *, char *, size_t);
    555 int		ns_sprintrrf(const uchar_t *, size_t, const char *,
    556     ns_class, ns_type, ulong_t, const uchar_t *,
    557     size_t, const char *, const char *,
    558     char *, size_t);
    559 int		ns_format_ttl(ulong_t, char *, size_t);
    560 int		ns_parse_ttl(const char *, ulong_t *);
    561 uint32_t	ns_datetosecs(const char *cp, int *errp);
    562 int		ns_name_ntol(const uchar_t *, uchar_t *, size_t);
    563 int		ns_name_ntop(const uchar_t *, char *, size_t);
    564 int		ns_name_pton(const char *, uchar_t *, size_t);
    565 int		ns_name_unpack(const uchar_t *, const uchar_t *,
    566 				    const uchar_t *, uchar_t *, size_t);
    567 int		ns_name_pack(const uchar_t *, uchar_t *, int,
    568     const uchar_t **, const uchar_t **);
    569 int		ns_name_uncompress(const uchar_t *, const uchar_t *,
    570 					const uchar_t *, char *, size_t);
    571 int		ns_name_compress(const char *, uchar_t *, size_t,
    572 			const uchar_t **, const uchar_t **);
    573 int		ns_name_skip(const uchar_t **, const uchar_t *);
    574 void	ns_name_rollback(const uchar_t *, const uchar_t **,
    575 			const uchar_t **);
    576 int		ns_sign(uchar_t *, int *, int, int, void *,
    577 			const uchar_t *, int, uchar_t *, int *, time_t);
    578 int		ns_sign2(uchar_t *, int *, int, int, void *,
    579 			const uchar_t *, int, uchar_t *, int *, time_t,
    580 			uchar_t **, uchar_t **);
    581 int		ns_sign_tcp(uchar_t *, int *, int, int,
    582 			ns_tcp_tsig_state *, int);
    583 int		ns_sign_tcp2(uchar_t *, int *, int, int,
    584 			ns_tcp_tsig_state *, int,
    585 			uchar_t **, uchar_t **);
    586 int		ns_sign_tcp_init(void *, const uchar_t *, int,
    587 					ns_tcp_tsig_state *);
    588 uchar_t		*ns_find_tsig(uchar_t *, uchar_t *);
    589 int		ns_verify(uchar_t *, int *, void *,
    590 			const uchar_t *, int, uchar_t *, int *,
    591 			time_t *, int);
    592 int		ns_verify_tcp(uchar_t *, int *, ns_tcp_tsig_state *, int);
    593 int		ns_verify_tcp_init(void *, const uchar_t *, int,
    594 					ns_tcp_tsig_state *);
    595 int		ns_samedomain(const char *, const char *);
    596 int		ns_subdomain(const char *, const char *);
    597 int		ns_makecanon(const char *, char *, size_t);
    598 int		ns_samename(const char *, const char *);
    599 
    600 #ifdef BIND_4_COMPAT
    601 #include <arpa/nameser_compat.h>
    602 #endif
    603 
    604 #ifdef	__cplusplus
    605 }
    606 #endif
    607 
    608 #endif	/* !_ARPA_NAMESER_H */
    609