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) 1996-1999 by Internet Software Consortium.
32  *
33  * Permission to use, copy, modify, and distribute this software for any
34  * purpose with or without fee is hereby granted, provided that the above
35  * copyright notice and this permission notice appear in all copies.
36  *
37  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
38  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
39  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
40  * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
41  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
42  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
43  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
44  * SOFTWARE.
45  */
46 
47 /*
48  *	$BINDId: nameser.h,v 8.37 2000/03/30 21:16:49 vixie Exp $
49  */
50 
51 #ifndef _ARPA_NAMESER_H_
52 #define _ARPA_NAMESER_H_
53 
54 #define BIND_4_COMPAT
55 
56 #include <sys/param.h>
57 #if (!defined(BSD)) || (BSD < 199306)
58 # include <sys/bitypes.h>
59 #else
60 # include <sys/types.h>
61 #endif
62 #include <sys/cdefs.h>
63 
64 /*
65  * Revision information.  This is the release date in YYYYMMDD format.
66  * It can change every day so the right thing to do with it is use it
67  * in preprocessor commands such as "#if (__NAMESER > 19931104)".  Do not
68  * compare for equality; rather, use it to determine whether your 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_char	*_msg, *_eom;
114 	u_int16_t	_id, _flags, _counts[ns_s_max];
115 	const u_char	*_sections[ns_s_max];
116 	ns_sect		_sect;
117 	int		_rrnum;
118 	const u_char	*_ptr;
119 } ns_msg;
120 
121 /* Accessor macros - this is part of the public interface. */
122 #define ns_msg_id(handle) ((handle)._id + 0)
123 #define ns_msg_base(handle) ((handle)._msg + 0)
124 #define ns_msg_end(handle) ((handle)._eom + 0)
125 #define ns_msg_size(handle) ((handle)._eom - (handle)._msg)
126 #define ns_msg_count(handle, section) ((handle)._counts[section] + 0)
127 
128 /*
129  * This is a parsed record.  It is caller allocated and has no dynamic data.
130  */
131 typedef	struct __ns_rr {
132 	char		name[NS_MAXDNAME];
133 	u_int16_t	type;
134 	u_int16_t	rr_class;
135 	u_int32_t	ttl;
136 	u_int16_t	rdlength;
137 	const u_char *	rdata;
138 } ns_rr;
139 
140 /* Accessor macros - this is part of the public interface. */
141 #define ns_rr_name(rr)	(((rr).name[0] != '\0') ? (rr).name : ".")
142 #define ns_rr_type(rr)	((ns_type)((rr).type + 0))
143 #define ns_rr_class(rr)	((ns_class)((rr).rr_class + 0))
144 #define ns_rr_ttl(rr)	((rr).ttl + 0)
145 #define ns_rr_rdlen(rr)	((rr).rdlength + 0)
146 #define ns_rr_rdata(rr)	((rr).rdata + 0)
147 
148 /*
149  * These don't have to be in the same order as in the packet flags word,
150  * and they can even overlap in some cases, but they will need to be kept
151  * in synch with ns_parse.c:ns_flagdata[].
152  */
153 typedef enum __ns_flag {
154 	ns_f_qr,		/* Question/Response. */
155 	ns_f_opcode,		/* Operation code. */
156 	ns_f_aa,		/* Authoritative Answer. */
157 	ns_f_tc,		/* Truncation occurred. */
158 	ns_f_rd,		/* Recursion Desired. */
159 	ns_f_ra,		/* Recursion Available. */
160 	ns_f_z,			/* MBZ. */
161 	ns_f_ad,		/* Authentic Data (DNSSEC). */
162 	ns_f_cd,		/* Checking Disabled (DNSSEC). */
163 	ns_f_rcode,		/* Response code. */
164 	ns_f_max
165 } ns_flag;
166 
167 /*
168  * Currently defined opcodes.
169  */
170 typedef enum __ns_opcode {
171 	ns_o_query = 0,		/* Standard query. */
172 	ns_o_iquery = 1,	/* Inverse query (deprecated/unsupported). */
173 	ns_o_status = 2,	/* Name server status query (unsupported). */
174 				/* Opcode 3 is undefined/reserved. */
175 	ns_o_notify = 4,	/* Zone change notification. */
176 	ns_o_update = 5,	/* Zone update message. */
177 	ns_o_max = 6
178 } ns_opcode;
179 
180 /*
181  * Currently defined response codes.
182  */
183 typedef	enum __ns_rcode {
184 	ns_r_noerror = 0,	/* No error occurred. */
185 	ns_r_formerr = 1,	/* Format error. */
186 	ns_r_servfail = 2,	/* Server failure. */
187 	ns_r_nxdomain = 3,	/* Name error. */
188 	ns_r_notimpl = 4,	/* Unimplemented. */
189 	ns_r_refused = 5,	/* Operation refused. */
190 	/* these are for BIND_UPDATE */
191 	ns_r_yxdomain = 6,	/* Name exists */
192 	ns_r_yxrrset = 7,	/* RRset exists */
193 	ns_r_nxrrset = 8,	/* RRset does not exist */
194 	ns_r_notauth = 9,	/* Not authoritative for zone */
195 	ns_r_notzone = 10,	/* Zone of record different from zone section */
196 	ns_r_max = 11,
197 	/* The following are TSIG extended errors */
198 	ns_r_badsig = 16,
199 	ns_r_badkey = 17,
200 	ns_r_badtime = 18
201 } ns_rcode;
202 
203 /* BIND_UPDATE */
204 typedef enum __ns_update_operation {
205 	ns_uop_delete = 0,
206 	ns_uop_add = 1,
207 	ns_uop_max = 2
208 } ns_update_operation;
209 
210 /*
211  * This structure is used for TSIG authenticated messages
212  */
213 struct ns_tsig_key {
214         char name[NS_MAXDNAME], alg[NS_MAXDNAME];
215         unsigned char *data;
216         int len;
217 };
218 typedef struct ns_tsig_key ns_tsig_key;
219 
220 /*
221  * This structure is used for TSIG authenticated TCP messages
222  */
223 struct ns_tcp_tsig_state {
224 	int counter;
225 	struct dst_key *key;
226 	void *ctx;
227 	unsigned char sig[NS_PACKETSZ];
228 	int siglen;
229 };
230 typedef struct ns_tcp_tsig_state ns_tcp_tsig_state;
231 
232 #define NS_TSIG_FUDGE 300
233 #define NS_TSIG_TCP_COUNT 100
234 #define NS_TSIG_ALG_HMAC_MD5 "HMAC-MD5.SIG-ALG.REG.INT"
235 
236 #define NS_TSIG_ERROR_NO_TSIG -10
237 #define NS_TSIG_ERROR_NO_SPACE -11
238 #define NS_TSIG_ERROR_FORMERR -12
239 
240 /*
241  * Currently defined type values for resources and queries.
242  */
243 typedef enum __ns_type {
244 	ns_t_invalid = 0,	/* Cookie. */
245 	ns_t_a = 1,		/* Host address. */
246 	ns_t_ns = 2,		/* Authoritative server. */
247 	ns_t_md = 3,		/* Mail destination. */
248 	ns_t_mf = 4,		/* Mail forwarder. */
249 	ns_t_cname = 5,		/* Canonical name. */
250 	ns_t_soa = 6,		/* Start of authority zone. */
251 	ns_t_mb = 7,		/* Mailbox domain name. */
252 	ns_t_mg = 8,		/* Mail group member. */
253 	ns_t_mr = 9,		/* Mail rename name. */
254 	ns_t_null = 10,		/* Null resource record. */
255 	ns_t_wks = 11,		/* Well known service. */
256 	ns_t_ptr = 12,		/* Domain name pointer. */
257 	ns_t_hinfo = 13,	/* Host information. */
258 	ns_t_minfo = 14,	/* Mailbox information. */
259 	ns_t_mx = 15,		/* Mail routing information. */
260 	ns_t_txt = 16,		/* Text strings. */
261 	ns_t_rp = 17,		/* Responsible person. */
262 	ns_t_afsdb = 18,	/* AFS cell database. */
263 	ns_t_x25 = 19,		/* X_25 calling address. */
264 	ns_t_isdn = 20,		/* ISDN calling address. */
265 	ns_t_rt = 21,		/* Router. */
266 	ns_t_nsap = 22,		/* NSAP address. */
267 	ns_t_nsap_ptr = 23,	/* Reverse NSAP lookup (deprecated). */
268 	ns_t_sig = 24,		/* Security signature. */
269 	ns_t_key = 25,		/* Security key. */
270 	ns_t_px = 26,		/* X.400 mail mapping. */
271 	ns_t_gpos = 27,		/* Geographical position (withdrawn). */
272 	ns_t_aaaa = 28,		/* Ip6 Address. */
273 	ns_t_loc = 29,		/* Location Information. */
274 	ns_t_nxt = 30,		/* Next domain (security). */
275 	ns_t_eid = 31,		/* Endpoint identifier. */
276 	ns_t_nimloc = 32,	/* Nimrod Locator. */
277 	ns_t_srv = 33,		/* Server Selection. */
278 	ns_t_atma = 34,		/* ATM Address */
279 	ns_t_naptr = 35,	/* Naming Authority PoinTeR */
280 	ns_t_kx = 36,		/* Key Exchange */
281 	ns_t_cert = 37,		/* Certification record */
282 	ns_t_a6 = 38,		/* IPv6 address (deprecated, use ns_t_aaaa) */
283 	ns_t_dname = 39,	/* Non-terminal DNAME (for IPv6) */
284 	ns_t_sink = 40,		/* Kitchen sink (experimentatl) */
285 	ns_t_opt = 41,		/* EDNS0 option (meta-RR) */
286 	ns_t_tsig = 250,	/* Transaction signature. */
287 	ns_t_ixfr = 251,	/* Incremental zone transfer. */
288 	ns_t_axfr = 252,	/* Transfer zone of authority. */
289 	ns_t_mailb = 253,	/* Transfer mailbox records. */
290 	ns_t_maila = 254,	/* Transfer mail agent records. */
291 	ns_t_any = 255,		/* Wildcard match. */
292 	ns_t_zxfr = 256,	/* BIND-specific, nonstandard. */
293 	ns_t_max = 65536
294 } ns_type;
295 
296 /* Exclusively a QTYPE? (not also an RTYPE) */
297 #define	ns_t_qt_p(t) (ns_t_xfr_p(t) || (t) == ns_t_any || \
298 		      (t) == ns_t_mailb || (t) == ns_t_maila)
299 /* Some kind of meta-RR? (not a QTYPE, but also not an RTYPE) */
300 #define	ns_t_mrr_p(t) ((t) == ns_t_tsig || (t) == ns_t_opt)
301 /* Exclusively an RTYPE? (not also a QTYPE or a meta-RR) */
302 #define ns_t_rr_p(t) (!ns_t_qt_p(t) && !ns_t_mrr_p(t))
303 #define ns_t_udp_p(t) ((t) != ns_t_axfr && (t) != ns_t_zxfr)
304 #define ns_t_xfr_p(t) ((t) == ns_t_axfr || (t) == ns_t_ixfr || \
305 		       (t) == ns_t_zxfr)
306 
307 /*
308  * Values for class field
309  */
310 typedef enum __ns_class {
311 	ns_c_invalid = 0,	/* Cookie. */
312 	ns_c_in = 1,		/* Internet. */
313 	ns_c_2 = 2,		/* unallocated/unsupported. */
314 	ns_c_chaos = 3,		/* MIT Chaos-net. */
315 	ns_c_hs = 4,		/* MIT Hesiod. */
316 	/* Query class values which do not appear in resource records */
317 	ns_c_none = 254,	/* for prereq. sections in update requests */
318 	ns_c_any = 255,		/* Wildcard match. */
319 	ns_c_max = 65536
320 } ns_class;
321 
322 /* DNSSEC constants. */
323 
324 typedef enum __ns_key_types {
325 	ns_kt_rsa = 1,		/* key type RSA/MD5 */
326 	ns_kt_dh  = 2,		/* Diffie Hellman */
327 	ns_kt_dsa = 3,		/* Digital Signature Standard (MANDATORY) */
328 	ns_kt_private = 254	/* Private key type starts with OID */
329 } ns_key_types;
330 
331 typedef enum __ns_cert_types {
332 	cert_t_pkix = 1,	/* PKIX (X.509v3) */
333 	cert_t_spki = 2,	/* SPKI */
334 	cert_t_pgp  = 3,	/* PGP */
335 	cert_t_url  = 253,	/* URL private type */
336 	cert_t_oid  = 254	/* OID private type */
337 } ns_cert_types;
338 
339 /* Flags field of the KEY RR rdata. */
340 #define	NS_KEY_TYPEMASK		0xC000	/* Mask for "type" bits */
341 #define	NS_KEY_TYPE_AUTH_CONF	0x0000	/* Key usable for both */
342 #define	NS_KEY_TYPE_CONF_ONLY	0x8000	/* Key usable for confidentiality */
343 #define	NS_KEY_TYPE_AUTH_ONLY	0x4000	/* Key usable for authentication */
344 #define	NS_KEY_TYPE_NO_KEY	0xC000	/* No key usable for either; no key */
345 /* The type bits can also be interpreted independently, as single bits: */
346 #define	NS_KEY_NO_AUTH		0x8000	/* Key unusable for authentication */
347 #define	NS_KEY_NO_CONF		0x4000	/* Key unusable for confidentiality */
348 #define	NS_KEY_RESERVED2	0x2000	/* Security is *mandatory* if bit=0 */
349 #define	NS_KEY_EXTENDED_FLAGS	0x1000	/* reserved - must be zero */
350 #define	NS_KEY_RESERVED4	0x0800  /* reserved - must be zero */
351 #define	NS_KEY_RESERVED5	0x0400  /* reserved - must be zero */
352 #define	NS_KEY_NAME_TYPE	0x0300	/* these bits determine the type */
353 #define	NS_KEY_NAME_USER	0x0000	/* key is assoc. with user */
354 #define	NS_KEY_NAME_ENTITY	0x0200	/* key is assoc. with entity eg host */
355 #define	NS_KEY_NAME_ZONE	0x0100	/* key is zone key */
356 #define	NS_KEY_NAME_RESERVED	0x0300	/* reserved meaning */
357 #define	NS_KEY_RESERVED8	0x0080  /* reserved - must be zero */
358 #define	NS_KEY_RESERVED9	0x0040  /* reserved - must be zero */
359 #define	NS_KEY_RESERVED10	0x0020  /* reserved - must be zero */
360 #define	NS_KEY_RESERVED11	0x0010  /* reserved - must be zero */
361 #define	NS_KEY_SIGNATORYMASK	0x000F	/* key can sign RR's of same name */
362 #define	NS_KEY_RESERVED_BITMASK ( NS_KEY_RESERVED2 | \
363 				  NS_KEY_RESERVED4 | \
364 				  NS_KEY_RESERVED5 | \
365 				  NS_KEY_RESERVED8 | \
366 				  NS_KEY_RESERVED9 | \
367 				  NS_KEY_RESERVED10 | \
368 				  NS_KEY_RESERVED11 )
369 #define NS_KEY_RESERVED_BITMASK2 0xFFFF /* no bits defined here */
370 
371 /* The Algorithm field of the KEY and SIG RR's is an integer, {1..254} */
372 #define	NS_ALG_MD5RSA		1	/* MD5 with RSA */
373 #define	NS_ALG_DH               2	/* Diffie Hellman KEY */
374 #define	NS_ALG_DSA              3	/* DSA KEY */
375 #define	NS_ALG_DSS              NS_ALG_DSA
376 #define	NS_ALG_EXPIRE_ONLY	253	/* No alg, no security */
377 #define	NS_ALG_PRIVATE_OID	254	/* Key begins with OID giving alg */
378 
379 /* Protocol values  */
380 /* value 0 is reserved */
381 #define NS_KEY_PROT_TLS         1
382 #define NS_KEY_PROT_EMAIL       2
383 #define NS_KEY_PROT_DNSSEC      3
384 #define NS_KEY_PROT_IPSEC       4
385 #define NS_KEY_PROT_ANY		255
386 
387 /* Signatures */
388 #define	NS_MD5RSA_MIN_BITS	 512	/* Size of a mod or exp in bits */
389 #define	NS_MD5RSA_MAX_BITS	2552
390 	/* Total of binary mod and exp */
391 #define	NS_MD5RSA_MAX_BYTES	((NS_MD5RSA_MAX_BITS+7/8)*2+3)
392 	/* Max length of text sig block */
393 #define	NS_MD5RSA_MAX_BASE64	(((NS_MD5RSA_MAX_BYTES+2)/3)*4)
394 #define NS_MD5RSA_MIN_SIZE	((NS_MD5RSA_MIN_BITS+7)/8)
395 #define NS_MD5RSA_MAX_SIZE	((NS_MD5RSA_MAX_BITS+7)/8)
396 
397 #define NS_DSA_SIG_SIZE         41
398 #define NS_DSA_MIN_SIZE         213
399 #define NS_DSA_MAX_BYTES        405
400 
401 /* Offsets into SIG record rdata to find various values */
402 #define	NS_SIG_TYPE	0	/* Type flags */
403 #define	NS_SIG_ALG	2	/* Algorithm */
404 #define	NS_SIG_LABELS	3	/* How many labels in name */
405 #define	NS_SIG_OTTL	4	/* Original TTL */
406 #define	NS_SIG_EXPIR	8	/* Expiration time */
407 #define	NS_SIG_SIGNED	12	/* Signature time */
408 #define	NS_SIG_FOOT	16	/* Key footprint */
409 #define	NS_SIG_SIGNER	18	/* Domain name of who signed it */
410 
411 /* How RR types are represented as bit-flags in NXT records */
412 #define	NS_NXT_BITS 8
413 #define	NS_NXT_BIT_SET(  n,p) (p[(n)/NS_NXT_BITS] |=  (0x80>>((n)%NS_NXT_BITS)))
414 #define	NS_NXT_BIT_CLEAR(n,p) (p[(n)/NS_NXT_BITS] &= ~(0x80>>((n)%NS_NXT_BITS)))
415 #define	NS_NXT_BIT_ISSET(n,p) (p[(n)/NS_NXT_BITS] &   (0x80>>((n)%NS_NXT_BITS)))
416 #define NS_NXT_MAX 127
417 
418 /*
419  * Inline versions of get/put short/long.  Pointer is advanced.
420  */
421 #define NS_GET16(s, cp) do { \
422 	register u_char *t_cp = (u_char *)(cp); \
423 	(s) = ((u_int16_t)t_cp[0] << 8) \
424 	    | ((u_int16_t)t_cp[1]) \
425 	    ; \
426 	(cp) += NS_INT16SZ; \
427 } while (0)
428 
429 #define NS_GET32(l, cp) do { \
430 	register u_char *t_cp = (u_char *)(cp); \
431 	(l) = ((u_int32_t)t_cp[0] << 24) \
432 	    | ((u_int32_t)t_cp[1] << 16) \
433 	    | ((u_int32_t)t_cp[2] << 8) \
434 	    | ((u_int32_t)t_cp[3]) \
435 	    ; \
436 	(cp) += NS_INT32SZ; \
437 } while (0)
438 
439 #define NS_PUT16(s, cp) do { \
440 	register u_int16_t t_s = (u_int16_t)(s); \
441 	register u_char *t_cp = (u_char *)(cp); \
442 	*t_cp++ = t_s >> 8; \
443 	*t_cp   = t_s; \
444 	(cp) += NS_INT16SZ; \
445 } while (0)
446 
447 #define NS_PUT32(l, cp) do { \
448 	register u_int32_t t_l = (u_int32_t)(l); \
449 	register u_char *t_cp = (u_char *)(cp); \
450 	*t_cp++ = t_l >> 24; \
451 	*t_cp++ = t_l >> 16; \
452 	*t_cp++ = t_l >> 8; \
453 	*t_cp   = t_l; \
454 	(cp) += NS_INT32SZ; \
455 } while (0)
456 
457 /*
458  * ANSI C identifier hiding for bind's lib/nameser.
459  */
460 #define ns_get16		__ns_get16
461 #define ns_get32		__ns_get32
462 #define ns_put16		__ns_put16
463 #define ns_put32		__ns_put32
464 #define ns_initparse		__ns_initparse
465 #define ns_skiprr		__ns_skiprr
466 #define ns_parserr		__ns_parserr
467 #define	ns_sprintrr		__ns_sprintrr
468 #define	ns_sprintrrf		__ns_sprintrrf
469 #define	ns_format_ttl		__ns_format_ttl
470 #define	ns_parse_ttl		__ns_parse_ttl
471 #define ns_datetosecs		__ns_datetosecs
472 #define	ns_name_ntol		__ns_name_ntol
473 #define	ns_name_ntop		__ns_name_ntop
474 #define	ns_name_pton		__ns_name_pton
475 #define	ns_name_unpack		__ns_name_unpack
476 #define	ns_name_pack		__ns_name_pack
477 #define	ns_name_compress	__ns_name_compress
478 #define	ns_name_uncompress	__ns_name_uncompress
479 #define	ns_name_skip		__ns_name_skip
480 #define	ns_name_rollback	__ns_name_rollback
481 #define	ns_sign			__ns_sign
482 #define	ns_sign_tcp		__ns_sign_tcp
483 #define	ns_sign_tcp_init	__ns_sign_tcp_init
484 #define ns_find_tsig		__ns_find_tsig
485 #define	ns_verify		__ns_verify
486 #define	ns_verify_tcp		__ns_verify_tcp
487 #define	ns_verify_tcp_init	__ns_verify_tcp_init
488 #define	ns_samedomain		__ns_samedomain
489 #define	ns_subdomain		__ns_subdomain
490 #define	ns_makecanon		__ns_makecanon
491 #define	ns_samename		__ns_samename
492 
493 __BEGIN_DECLS
494 int			ns_msg_getflag (ns_msg, int) __THROW;
495 u_int		ns_get16 (const u_char *) __THROW;
496 u_long		ns_get32 (const u_char *) __THROW;
497 void		ns_put16 (u_int, u_char *) __THROW;
498 void		ns_put32 (u_long, u_char *) __THROW;
499 int		ns_initparse (const u_char *, int, ns_msg *) __THROW;
500 int		ns_skiprr (const u_char *, const u_char *, ns_sect, int)
501      __THROW;
502 libc_hidden_proto(ns_skiprr)
503 int		ns_parserr (ns_msg *, ns_sect, int, ns_rr *) __THROW;
504 int		ns_sprintrr (const ns_msg *, const ns_rr *,
505 			     const char *, const char *, char *, size_t)
506      __THROW;
507 int		ns_sprintrrf (const u_char *, size_t, const char *,
508 			      ns_class, ns_type, u_long, const u_char *,
509 			      size_t, const char *, const char *,
510 			      char *, size_t) __THROW;
511 int		ns_format_ttl (u_long, char *, size_t) __THROW;
512 int		ns_parse_ttl (const char *, u_long *) __THROW;
513 u_int32_t	ns_datetosecs (const char *cp, int *errp) __THROW;
514 int		ns_name_ntol (const u_char *, u_char *, size_t) __THROW;
515 int		ns_name_ntop (const u_char *, char *, size_t) __THROW;
516 libc_hidden_proto(ns_name_ntop)
517 int		ns_name_pton (const char *, u_char *, size_t) __THROW;
518 libc_hidden_proto(ns_name_pton)
519 int		ns_name_unpack (const u_char *, const u_char *,
520 				const u_char *, u_char *, size_t) __THROW;
521 libc_hidden_proto(ns_name_unpack)
522 int		ns_name_pack (const u_char *, u_char *, int,
523 			      const u_char **, const u_char **) __THROW;
524 libc_hidden_proto(ns_name_pack)
525 int		ns_name_uncompress (const u_char *, const u_char *,
526 				    const u_char *, char *, size_t) __THROW;
527 libc_hidden_proto(ns_name_uncompress)
528 int		ns_name_compress (const char *, u_char *, size_t,
529 				  const u_char **, const u_char **) __THROW;
530 libc_hidden_proto(ns_name_compress)
531 int		ns_name_skip (const u_char **, const u_char *) __THROW;
532 libc_hidden_proto(ns_name_skip)
533 void		ns_name_rollback (const u_char *, const u_char **,
534 				  const u_char **) __THROW;
535 int		ns_sign (u_char *, int *, int, int, void *,
536 			 const u_char *, int, u_char *, int *, time_t) __THROW;
537 int		ns_sign_tcp (u_char *, int *, int, int,
538 			     ns_tcp_tsig_state *, int) __THROW;
539 int		ns_sign_tcp_init (void *, const u_char *, int,
540 				  ns_tcp_tsig_state *) __THROW;
541 u_char		*ns_find_tsig (u_char *, u_char *) __THROW;
542 int		ns_verify (u_char *, int *, void *, const u_char *, int,
543 			   u_char *, int *, time_t *, int) __THROW;
544 int		ns_verify_tcp (u_char *, int *, ns_tcp_tsig_state *, int)
545      __THROW;
546 int		ns_verify_tcp_init (void *, const u_char *, int,
547 				    ns_tcp_tsig_state *) __THROW;
548 int		ns_samedomain (const char *, const char *) __THROW;
549 int		ns_subdomain (const char *, const char *) __THROW;
550 int		ns_makecanon (const char *, char *, size_t) __THROW;
551 int		ns_samename (const char *, const char *) __THROW;
552 __END_DECLS
553 
554 #ifdef BIND_4_COMPAT
555 #include <arpa/nameser_compat.h>
556 #endif
557 
558 #endif /* !_ARPA_NAMESER_H_ */
559