ISC DHCP  4.3.3
A reference DHCPv4 and DHCPv6 implementation
nameser.h
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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
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8  * 1. Redistributions of source code must retain the above copyright
9  * notice, this list of conditions and the following disclaimer.
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29 
30 /*
31  * Copyright (c) 2004,2009 by Internet Systems Consortium, Inc. ("ISC")
32  * Copyright (c) 1996-2003 by Internet Software Consortium
33  *
34  * Permission to use, copy, modify, and distribute this software for any
35  * purpose with or without fee is hereby granted, provided that the above
36  * copyright notice and this permission notice appear in all copies.
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39  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
40  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
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42  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
43  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
44  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
45  *
46  * Internet Systems Consortium, Inc.
47  * 950 Charter Street
48  * Redwood City, CA 94063
49  * <info@isc.org>
50  * https://www.isc.org/
51  */
52 
53 /*
54  * $Id: nameser.h,v 1.7 2009/11/24 02:06:56 sar Exp $
55  */
56 
57 #ifndef _ARPA_NAMESER_H_
58 #define _ARPA_NAMESER_H_
59 
60 /*
61  * Revision information. This is the release date in YYYYMMDD format.
62  * It can change every day so the right thing to do with it is use it
63  * in preprocessor commands such as "#if (__NAMESER > 19931104)". Do not
64  * compare for equality; rather, use it to determine whether your libbind.a
65  * contains a new enough lib/nameser/ to support the feature you need.
66  */
67 
68 #define __NAMESER 19991006 /* New interface version stamp. */
69 
70 /*
71  * Define constants based on RFC 883, RFC 1034, RFC 1035
72  */
73 #define NS_PACKETSZ 512 /* maximum packet size */
74 #define NS_MAXDNAME 1025 /* maximum domain name */
75 #define NS_MAXCDNAME 255 /* maximum compressed domain name */
76 #define NS_MAXLABEL 63 /* maximum length of domain label */
77 #define NS_HFIXEDSZ 12 /* #/bytes of fixed data in header */
78 #define NS_QFIXEDSZ 4 /* #/bytes of fixed data in query */
79 #define NS_RRFIXEDSZ 10 /* #/bytes of fixed data in r record */
80 #define NS_INT32SZ 4 /* #/bytes of data in a u_int32_t */
81 #define NS_INT16SZ 2 /* #/bytes of data in a u_int16_t */
82 #define NS_INT8SZ 1 /* #/bytes of data in a u_int8_t */
83 #define NS_INADDRSZ 4 /* IPv4 T_A */
84 #define NS_IN6ADDRSZ 16 /* IPv6 T_AAAA */
85 #define NS_CMPRSFLGS 0xc0 /* Flag bits indicating name compression. */
86 #define NS_DEFAULTPORT 53 /* For both TCP and UDP. */
87 
88 /*
89  * These can be expanded with synonyms, just keep ns_parse.c:ns_parserecord()
90  * in synch with it.
91  */
92 typedef enum __ns_sect {
93  ns_s_qd = 0, /* Query: Question. */
94  ns_s_zn = 0, /* Update: Zone. */
95  ns_s_an = 1, /* Query: Answer. */
96  ns_s_pr = 1, /* Update: Prerequisites. */
97  ns_s_ns = 2, /* Query: Name servers. */
98  ns_s_ud = 2, /* Update: Update. */
99  ns_s_ar = 3, /* Query|Update: Additional records. */
101 } ns_sect;
102 
103 /*
104  * This is a message handle. It is caller allocated and has no dynamic data.
105  * This structure is intended to be opaque to all but ns_parse.c, thus the
106  * leading _'s on the member names. Use the accessor functions, not the _'s.
107  */
108 typedef struct __ns_msg {
109  const u_int8_t *_msg, *_eom;
110  u_int16_t _id, _flags, _counts[ns_s_max];
111  const u_int8_t *_sections[ns_s_max];
113  int _rrnum;
114  const u_int8_t *_ptr;
115 } ns_msg;
116 
117 /* Private data structure - do not use from outside library. */
118 struct _ns_flagdata { int mask, shift; };
119 extern struct _ns_flagdata _ns_flagdata[];
120 
121 /* Accessor macros - this is part of the public interface. */
122 #define ns_msg_getflag(handle, flag) ( \
123  ((handle)._flags & _ns_flagdata[flag].mask) \
124  >> _ns_flagdata[flag].shift \
125  )
126 #define ns_msg_id(handle) ((handle)._id + 0)
127 #define ns_msg_base(handle) ((handle)._msg + 0)
128 #define ns_msg_end(handle) ((handle)._eom + 0)
129 #define ns_msg_size(handle) ((handle)._eom - (handle)._msg)
130 #define ns_msg_count(handle, section) ((handle)._counts[section] + 0)
131 
132 /*
133  * This is a parsed record. It is caller allocated and has no dynamic data.
134  */
135 typedef struct __ns_rr {
137  u_int16_t type;
138  u_int16_t rr_class;
139  u_int32_t ttl;
140  u_int16_t rdlength;
141  const u_int8_t *rdata;
142 } ns_rr;
143 
144 /* Accessor macros - this is part of the public interface. */
145 #define ns_rr_name(rr) (((rr).name[0] != '\0') ? (rr).name : ".")
146 #define ns_rr_type(rr) ((ns_type)((rr).type + 0))
147 #define ns_rr_class(rr) ((ns_class)((rr).rr_class + 0))
148 #define ns_rr_ttl(rr) ((rr).ttl + 0)
149 #define ns_rr_rdlen(rr) ((rr).rdlength + 0)
150 #define ns_rr_rdata(rr) ((rr).rdata + 0)
151 
152 /*
153  * These don't have to be in the same order as in the packet flags word,
154  * and they can even overlap in some cases, but they will need to be kept
155  * in synch with ns_parse.c:ns_flagdata[].
156  */
157 typedef enum __ns_flag {
158  ns_f_qr, /* Question/Response. */
159  ns_f_opcode, /* Operation code. */
160  ns_f_aa, /* Authoritative Answer. */
161  ns_f_tc, /* Truncation occurred. */
162  ns_f_rd, /* Recursion Desired. */
163  ns_f_ra, /* Recursion Available. */
164  ns_f_z, /* MBZ. */
165  ns_f_ad, /* Authentic Data (DNSSEC). */
166  ns_f_cd, /* Checking Disabled (DNSSEC). */
167  ns_f_rcode, /* Response code. */
169 } ns_flag;
170 
171 /*
172  * Currently defined opcodes.
173  */
174 typedef enum __ns_opcode {
175  ns_o_query = 0, /* Standard query. */
176  ns_o_iquery = 1, /* Inverse query (deprecated/unsupported). */
177  ns_o_status = 2, /* Name server status query (unsupported). */
178  /* Opcode 3 is undefined/reserved. */
179  ns_o_notify = 4, /* Zone change notification. */
180  ns_o_update = 5, /* Zone update message. */
182 } ns_opcode;
183 
184 /*
185  * Currently defined response codes.
186  */
187 typedef enum __ns_rcode {
188  ns_r_noerror = 0, /* No error occurred. */
189  ns_r_formerr = 1, /* Format error. */
190  ns_r_servfail = 2, /* Server failure. */
191  ns_r_nxdomain = 3, /* Name error. */
192  ns_r_notimpl = 4, /* Unimplemented. */
193  ns_r_refused = 5, /* Operation refused. */
194  /* these are for BIND_UPDATE */
195  ns_r_yxdomain = 6, /* Name exists */
196  ns_r_yxrrset = 7, /* RRset exists */
197  ns_r_nxrrset = 8, /* RRset does not exist */
198  ns_r_notauth = 9, /* Not authoritative for zone */
199  ns_r_notzone = 10, /* Zone of record different from zone section */
200  ns_r_max = 11,
201  /* The following are TSIG extended errors */
205 } ns_rcode;
206 
207 /* BIND_UPDATE */
208 typedef enum __ns_update_operation {
213 
214 /*
215  * This structure is used for TSIG authenticated messages
216  */
217 struct ns_tsig_key {
219  unsigned char *data;
220  unsigned len;
221 };
222 typedef struct ns_tsig_key ns_tsig_key;
223 
224 /*
225  * This structure is used for TSIG authenticated TCP messages
226  */
228  int counter;
229  struct dst_key *key;
230  void *ctx;
231  unsigned char sig[NS_PACKETSZ];
232  unsigned siglen;
233 };
235 
236 #define NS_TSIG_FUDGE 300
237 #define NS_TSIG_TCP_COUNT 100
238 #define NS_TSIG_ALG_HMAC_MD5 "HMAC-MD5.SIG-ALG.REG.INT"
239 
240 #define NS_TSIG_ERROR_NO_TSIG -10
241 #define NS_TSIG_ERROR_NO_SPACE -11
242 #define NS_TSIG_ERROR_FORMERR -12
243 
244 /*
245  * Currently defined type values for resources and queries.
246  */
247 typedef enum __ns_type {
248  ns_t_invalid = 0, /* Cookie. */
249  ns_t_a = 1, /* Host address. */
250  ns_t_ns = 2, /* Authoritative server. */
251  ns_t_md = 3, /* Mail destination. */
252  ns_t_mf = 4, /* Mail forwarder. */
253  ns_t_cname = 5, /* Canonical name. */
254  ns_t_soa = 6, /* Start of authority zone. */
255  ns_t_mb = 7, /* Mailbox domain name. */
256  ns_t_mg = 8, /* Mail group member. */
257  ns_t_mr = 9, /* Mail rename name. */
258  ns_t_null = 10, /* Null resource record. */
259  ns_t_wks = 11, /* Well known service. */
260  ns_t_ptr = 12, /* Domain name pointer. */
261  ns_t_hinfo = 13, /* Host information. */
262  ns_t_minfo = 14, /* Mailbox information. */
263  ns_t_mx = 15, /* Mail routing information. */
264  ns_t_txt = 16, /* Text strings. */
265  ns_t_rp = 17, /* Responsible person. */
266  ns_t_afsdb = 18, /* AFS cell database. */
267  ns_t_x25 = 19, /* X_25 calling address. */
268  ns_t_isdn = 20, /* ISDN calling address. */
269  ns_t_rt = 21, /* Router. */
270  ns_t_nsap = 22, /* NSAP address. */
271  ns_t_nsap_ptr = 23, /* Reverse NSAP lookup (deprecated). */
272  ns_t_sig = 24, /* Security signature. */
273  ns_t_key = 25, /* Security key. */
274  ns_t_px = 26, /* X.400 mail mapping. */
275  ns_t_gpos = 27, /* Geographical position (withdrawn). */
276  ns_t_aaaa = 28, /* Ip6 Address. */
277  ns_t_loc = 29, /* Location Information. */
278  ns_t_nxt = 30, /* Next domain (security). */
279  ns_t_eid = 31, /* Endpoint identifier. */
280  ns_t_nimloc = 32, /* Nimrod Locator. */
281  ns_t_srv = 33, /* Server Selection. */
282  ns_t_atma = 34, /* ATM Address */
283  ns_t_naptr = 35, /* Naming Authority PoinTeR */
284  ns_t_kx = 36, /* Key Exchange */
285  ns_t_cert = 37, /* Certification record */
286  ns_t_a6 = 38, /* IPv6 address (deprecates AAAA) */
287  ns_t_dname = 39, /* Non-terminal DNAME (for IPv6) */
288  ns_t_sink = 40, /* Kitchen sink (experimentatl) */
289  ns_t_opt = 41, /* EDNS0 option (meta-RR) */
290  ns_t_tsig = 250, /* Transaction signature. */
291  ns_t_ixfr = 251, /* Incremental zone transfer. */
292  ns_t_axfr = 252, /* Transfer zone of authority. */
293  ns_t_mailb = 253, /* Transfer mailbox records. */
294  ns_t_maila = 254, /* Transfer mail agent records. */
295  ns_t_any = 255, /* Wildcard match. */
296  ns_t_zxfr = 256, /* BIND-specific, nonstandard. */
297  ns_t_max = 65536
298 } ns_type;
299 
300 /* Exclusively a QTYPE? (not also an RTYPE) */
301 #define ns_t_qt_p(t) (ns_t_xfr_p(t) || (t) == ns_t_any || \
302  (t) == ns_t_mailb || (t) == ns_t_maila)
303 /* Some kind of meta-RR? (not a QTYPE, but also not an RTYPE) */
304 #define ns_t_mrr_p(t) ((t) == ns_t_tsig || (t) == ns_t_opt)
305 /* Exclusively an RTYPE? (not also a QTYPE or a meta-RR) */
306 #define ns_t_rr_p(t) (!ns_t_qt_p(t) && !ns_t_mrr_p(t))
307 #define ns_t_udp_p(t) ((t) != ns_t_axfr && (t) != ns_t_zxfr)
308 #define ns_t_xfr_p(t) ((t) == ns_t_axfr || (t) == ns_t_ixfr || \
309  (t) == ns_t_zxfr)
310 
311 /*
312  * Values for class field
313  */
314 typedef enum __ns_class {
315  ns_c_invalid = 0, /* Cookie. */
316  ns_c_in = 1, /* Internet. */
317  ns_c_2 = 2, /* unallocated/unsupported. */
318  ns_c_chaos = 3, /* MIT Chaos-net. */
319  ns_c_hs = 4, /* MIT Hesiod. */
320  /* Query class values which do not appear in resource records */
321  ns_c_none = 254, /* for prereq. sections in update requests */
322  ns_c_any = 255, /* Wildcard match. */
323  ns_c_max = 65536
324 } ns_class;
325 
326 /* DNSSEC constants. */
327 
328 typedef enum __ns_key_types {
329  ns_kt_rsa = 1, /* key type RSA/MD5 */
330  ns_kt_dh = 2, /* Diffie Hellman */
331  ns_kt_dsa = 3, /* Digital Signature Standard (MANDATORY) */
332  ns_kt_private = 254 /* Private key type starts with OID */
333 } ns_key_types;
334 
335 typedef enum __ns_cert_types {
336  cert_t_pkix = 1, /* PKIX (X.509v3) */
337  cert_t_spki = 2, /* SPKI */
338  cert_t_pgp = 3, /* PGP */
339  cert_t_url = 253, /* URL private type */
340  cert_t_oid = 254 /* OID private type */
341 } ns_cert_types;
342 
343 /* Flags field of the KEY RR rdata. */
344 #define NS_KEY_TYPEMASK 0xC000 /* Mask for "type" bits */
345 #define NS_KEY_TYPE_AUTH_CONF 0x0000 /* Key usable for both */
346 #define NS_KEY_TYPE_CONF_ONLY 0x8000 /* Key usable for confidentiality */
347 #define NS_KEY_TYPE_AUTH_ONLY 0x4000 /* Key usable for authentication */
348 #define NS_KEY_TYPE_NO_KEY 0xC000 /* No key usable for either; no key */
349 /* The type bits can also be interpreted independently, as single bits: */
350 #define NS_KEY_NO_AUTH 0x8000 /* Key unusable for authentication */
351 #define NS_KEY_NO_CONF 0x4000 /* Key unusable for confidentiality */
352 #define NS_KEY_RESERVED2 0x2000 /* Security is *mandatory* if bit=0 */
353 #define NS_KEY_EXTENDED_FLAGS 0x1000 /* reserved - must be zero */
354 #define NS_KEY_RESERVED4 0x0800 /* reserved - must be zero */
355 #define NS_KEY_RESERVED5 0x0400 /* reserved - must be zero */
356 #define NS_KEY_NAME_TYPE 0x0300 /* these bits determine the type */
357 #define NS_KEY_NAME_USER 0x0000 /* key is assoc. with user */
358 #define NS_KEY_NAME_ENTITY 0x0200 /* key is assoc. with entity eg host */
359 #define NS_KEY_NAME_ZONE 0x0100 /* key is zone key */
360 #define NS_KEY_NAME_RESERVED 0x0300 /* reserved meaning */
361 #define NS_KEY_RESERVED8 0x0080 /* reserved - must be zero */
362 #define NS_KEY_RESERVED9 0x0040 /* reserved - must be zero */
363 #define NS_KEY_RESERVED10 0x0020 /* reserved - must be zero */
364 #define NS_KEY_RESERVED11 0x0010 /* reserved - must be zero */
365 #define NS_KEY_SIGNATORYMASK 0x000F /* key can sign RR's of same name */
366 #define NS_KEY_RESERVED_BITMASK ( NS_KEY_RESERVED2 | \
367  NS_KEY_RESERVED4 | \
368  NS_KEY_RESERVED5 | \
369  NS_KEY_RESERVED8 | \
370  NS_KEY_RESERVED9 | \
371  NS_KEY_RESERVED10 | \
372  NS_KEY_RESERVED11 )
373 #define NS_KEY_RESERVED_BITMASK2 0xFFFF /* no bits defined here */
374 
375 /* The Algorithm field of the KEY and SIG RR's is an integer, {1..254} */
376 #define NS_ALG_MD5RSA 1 /* MD5 with RSA */
377 #define NS_ALG_DH 2 /* Diffie Hellman KEY */
378 #define NS_ALG_DSA 3 /* DSA KEY */
379 #define NS_ALG_DSS NS_ALG_DSA
380 #define NS_ALG_EXPIRE_ONLY 253 /* No alg, no security */
381 #define NS_ALG_PRIVATE_OID 254 /* Key begins with OID giving alg */
382 
383 /* Protocol values */
384 /* value 0 is reserved */
385 #define NS_KEY_PROT_TLS 1
386 #define NS_KEY_PROT_EMAIL 2
387 #define NS_KEY_PROT_DNSSEC 3
388 #define NS_KEY_PROT_IPSEC 4
389 #define NS_KEY_PROT_ANY 255
390 
391 /* Signatures */
392 #define NS_MD5RSA_MIN_BITS 512 /* Size of a mod or exp in bits */
393 #define NS_MD5RSA_MAX_BITS 2552
394  /* Total of binary mod and exp */
395 #define NS_MD5RSA_MAX_BYTES ((NS_MD5RSA_MAX_BITS+7/8)*2+3)
396  /* Max length of text sig block */
397 #define NS_MD5RSA_MAX_BASE64 (((NS_MD5RSA_MAX_BYTES+2)/3)*4)
398 #define NS_MD5RSA_MIN_SIZE ((NS_MD5RSA_MIN_BITS+7)/8)
399 #define NS_MD5RSA_MAX_SIZE ((NS_MD5RSA_MAX_BITS+7)/8)
400 
401 #define NS_DSA_SIG_SIZE 41
402 #define NS_DSA_MIN_SIZE 213
403 #define NS_DSA_MAX_BYTES 405
404 
405 /* Offsets into SIG record rdata to find various values */
406 #define NS_SIG_TYPE 0 /* Type flags */
407 #define NS_SIG_ALG 2 /* Algorithm */
408 #define NS_SIG_LABELS 3 /* How many labels in name */
409 #define NS_SIG_OTTL 4 /* Original TTL */
410 #define NS_SIG_EXPIR 8 /* Expiration time */
411 #define NS_SIG_SIGNED 12 /* Signature time */
412 #define NS_SIG_FOOT 16 /* Key footprint */
413 #define NS_SIG_SIGNER 18 /* Domain name of who signed it */
414 
415 /* How RR types are represented as bit-flags in NXT records */
416 #define NS_NXT_BITS 8
417 #define NS_NXT_BIT_SET( n,p) (p[(n)/NS_NXT_BITS] |= (0x80>>((n)%NS_NXT_BITS)))
418 #define NS_NXT_BIT_CLEAR(n,p) (p[(n)/NS_NXT_BITS] &= ~(0x80>>((n)%NS_NXT_BITS)))
419 #define NS_NXT_BIT_ISSET(n,p) (p[(n)/NS_NXT_BITS] & (0x80>>((n)%NS_NXT_BITS)))
420 #define NS_NXT_MAX 127
421 
422 /*
423  * Inline versions of get/put short/long. Pointer is advanced.
424  */
425 #define NS_GET16(s, cp) do { \
426  register u_int8_t *t_cp = (u_int8_t *)(cp); \
427  (s) = ((u_int16_t)t_cp[0] << 8) \
428  | ((u_int16_t)t_cp[1]) \
429  ; \
430  (cp) += NS_INT16SZ; \
431 } while (0)
432 
433 #define NS_GET32(l, cp) do { \
434  register u_int8_t *t_cp = (u_int8_t *)(cp); \
435  (l) = ((u_int32_t)t_cp[0] << 24) \
436  | ((u_int32_t)t_cp[1] << 16) \
437  | ((u_int32_t)t_cp[2] << 8) \
438  | ((u_int32_t)t_cp[3]) \
439  ; \
440  (cp) += NS_INT32SZ; \
441 } while (0)
442 
443 #define NS_PUT16(s, cp) do { \
444  register u_int16_t t_s = (u_int16_t)(s); \
445  register u_int8_t *t_cp = (u_int8_t *)(cp); \
446  *t_cp++ = t_s >> 8; \
447  *t_cp = t_s; \
448  (cp) += NS_INT16SZ; \
449 } while (0)
450 
451 #define NS_PUT32(l, cp) do { \
452  register u_int32_t t_l = (u_int32_t)(l); \
453  register u_int8_t *t_cp = (u_int8_t *)(cp); \
454  *t_cp++ = t_l >> 24; \
455  *t_cp++ = t_l >> 16; \
456  *t_cp++ = t_l >> 8; \
457  *t_cp = t_l; \
458  (cp) += NS_INT32SZ; \
459 } while (0)
460 
461 #include <arpa/nameser_compat.h>
462 
463 #endif /* !_ARPA_NAMESER_H_ */
enum __ns_sect ns_sect
#define NS_PACKETSZ
Definition: nameser.h:73
__ns_rcode
Definition: nameser.h:187
unsigned siglen
Definition: nameser.h:232
__ns_flag
Definition: nameser.h:157
enum __ns_key_types ns_key_types
__ns_update_operation
Definition: nameser.h:208
u_int16_t rr_class
Definition: nameser.h:138
#define NS_MAXDNAME
Definition: nameser.h:74
__ns_sect
Definition: nameser.h:92
struct dst_key * key
Definition: nameser.h:229
const u_int8_t * _eom
Definition: nameser.h:109
u_int16_t _counts[ns_s_max]
Definition: nameser.h:110
u_int16_t rdlength
Definition: nameser.h:140
u_int16_t _flags
Definition: nameser.h:110
unsigned char sig[NS_PACKETSZ]
Definition: nameser.h:231
enum __ns_opcode ns_opcode
char alg[NS_MAXDNAME]
Definition: nameser.h:218
char name[NS_MAXDNAME]
Definition: nameser.h:218
__ns_opcode
Definition: nameser.h:174
u_int16_t _id
Definition: nameser.h:110
char name[NS_MAXDNAME]
Definition: nameser.h:136
enum __ns_cert_types ns_cert_types
u_int32_t ttl
Definition: nameser.h:139
__ns_type
Definition: nameser.h:247
const u_int8_t * rdata
Definition: nameser.h:141
enum __ns_flag ns_flag
ns_sect _sect
Definition: nameser.h:112
Definition: dst.h:5
const u_int8_t * _sections[ns_s_max]
Definition: nameser.h:111
enum __ns_class ns_class
struct __ns_rr ns_rr
unsigned char * data
Definition: nameser.h:219
enum __ns_update_operation ns_update_operation
enum __ns_rcode ns_rcode
__ns_cert_types
Definition: nameser.h:335
struct __ns_msg ns_msg
u_int16_t type
Definition: nameser.h:137
__ns_class
Definition: nameser.h:314
__ns_key_types
Definition: nameser.h:328
int _rrnum
Definition: nameser.h:113
enum __ns_type ns_type
const u_int8_t * _msg
Definition: nameser.h:109
unsigned len
Definition: nameser.h:220
const u_int8_t * _ptr
Definition: nameser.h:114