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nameser.h
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nameser.h
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/*
* Copyright (c) 1983, 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)nameser.h 8.2 (Berkeley) 2/16/94
* -
* Portions Copyright (c) 1993 by Digital Equipment Corporation.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies, and that
* the name of Digital Equipment Corporation not be used in advertising or
* publicity pertaining to distribution of the document or software without
* specific, written prior permission.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
* -
* --Copyright--
*/
#ifndef _NAMESER_H_
#define _NAMESER_H_
#include <sys/types.h>
/*
* Define constants based on rfc883
*/
#define PACKETSZ 512 /* maximum packet size */
#define MAXDNAME 256 /* maximum domain name */
#define MAXCDNAME 255 /* maximum compressed domain name */
#define MAXLABEL 63 /* maximum length of domain label */
/* Number of bytes of fixed size data in query structure */
#define QFIXEDSZ 4
/* number of bytes of fixed size data in resource record */
#define RRFIXEDSZ 10
/*
* Internet nameserver port number
*/
#define NAMESERVER_PORT 53
/*
* Port for multicast DNS; see
*
* http://files.multicastdns.org/draft-cheshire-dnsext-multicastdns.txt
*
* for the current mDNS spec.
*/
#define MULTICASTDNS_PORT 5353
/*
* Currently defined opcodes
*/
#define QUERY 0x0 /* standard query */
#define IQUERY 0x1 /* inverse query */
#define STATUS 0x2 /* nameserver status query */
#if 0
#define xxx 0x3 /* 0x3 reserved */
#endif
/* non standard - supports ALLOW_UPDATES stuff from Mike Schwartz */
#define UPDATEA 0x9 /* add resource record */
#define UPDATED 0xa /* delete a specific resource record */
#define UPDATEDA 0xb /* delete all named resource record */
#define UPDATEM 0xc /* modify a specific resource record */
#define UPDATEMA 0xd /* modify all named resource record */
#define ZONEINIT 0xe /* initial zone transfer */
#define ZONEREF 0xf /* incremental zone referesh */
/*
* Undefine various #defines from various System V-flavored OSes (Solaris,
* SINIX, HP-UX) so the compiler doesn't whine that we redefine them.
*/
#ifdef T_NULL
#undef T_NULL
#endif
#ifdef T_OPT
#undef T_OPT
#endif
#ifdef T_UNSPEC
#undef T_UNSPEC
#endif
#ifdef NOERROR
#undef NOERROR
#endif
/*
* Currently defined response codes
*/
#define NOERROR 0 /* no error */
#define FORMERR 1 /* format error */
#define SERVFAIL 2 /* server failure */
#define NXDOMAIN 3 /* non existent domain */
#define NOTIMP 4 /* not implemented */
#define REFUSED 5 /* query refused */
/* non standard */
#define NOCHANGE 0xf /* update failed to change db */
/*
* Type values for resources and queries
*/
#define T_A 1 /* host address */
#define T_NS 2 /* authoritative server */
#define T_MD 3 /* mail destination */
#define T_MF 4 /* mail forwarder */
#define T_CNAME 5 /* connonical name */
#define T_SOA 6 /* start of authority zone */
#define T_MB 7 /* mailbox domain name */
#define T_MG 8 /* mail group member */
#define T_MR 9 /* mail rename name */
#define T_NULL 10 /* null resource record */
#define T_WKS 11 /* well known service */
#define T_PTR 12 /* domain name pointer */
#define T_HINFO 13 /* host information */
#define T_MINFO 14 /* mailbox information */
#define T_MX 15 /* mail routing information */
#define T_TXT 16 /* text strings */
#define T_RP 17 /* responsible person */
#define T_AFSDB 18 /* AFS cell database */
#define T_X25 19 /* X_25 calling address */
#define T_ISDN 20 /* ISDN calling address */
#define T_RT 21 /* router */
#define T_NSAP 22 /* NSAP address */
#define T_NSAP_PTR 23 /* reverse lookup for NSAP */
#define T_SIG 24 /* security signature */
#define T_KEY 25 /* security key */
#define T_PX 26 /* X.400 mail mapping */
#define T_GPOS 27 /* geographical position (withdrawn) */
#define T_AAAA 28 /* IP6 Address */
#define T_LOC 29 /* Location Information */
#define T_NXT 30 /* Next Valid Name in Zone */
#define T_EID 31 /* Endpoint identifier */
#define T_NIMLOC 32 /* Nimrod locator */
#define T_SRV 33 /* Server selection */
#define T_ATMA 34 /* ATM Address */
#define T_NAPTR 35 /* Naming Authority PoinTeR */
#define T_KX 36 /* Key Exchanger */
#define T_CERT 37 /* Certificates in the DNS */
#define T_A6 38 /* IP6 address */
#define T_DNAME 39 /* non-terminal redirection */
#define T_SINK 40 /* unknown */
#define T_OPT 41 /* EDNS0 option (meta-RR) */
#define T_APL 42 /* lists of address prefixes */
#define T_DS 43 /* Delegation Signer */
#define T_SSHFP 44 /* SSH Fingerprint */
#define T_IPSECKEY 45 /* IPsec keying material */
#define T_RRSIG 46 /* new security signature */
#define T_NSEC 47 /* provable insecure information */
#define T_DNSKEY 48 /* new security key */
/* non standard */
#define T_SPF 99 /* sender policy framework */
#define T_UINFO 100 /* user (finger) information */
#define T_UID 101 /* user ID */
#define T_GID 102 /* group ID */
#define T_UNSPEC 103 /* Unspecified format (binary data) */
#define T_UNSPECA 104 /* "unspecified ascii". Ugly MIT hack */
/* Query type values which do not appear in resource records */
#define T_TKEY 249 /* Transaction Key [RFC2930] */
#define T_TSIG 250 /* Transaction Signature [RFC2845] */
#define T_IXFR 251 /* incremental transfer [RFC1995] */
#define T_AXFR 252 /* transfer zone of authority */
#define T_MAILB 253 /* transfer mailbox records */
#define T_MAILA 254 /* transfer mail agent records */
#define T_ANY 255 /* wildcard match */
/*
* Values for class field
*/
#define C_IN 1 /* the arpa internet */
#define C_CHAOS 3 /* for chaos net (MIT) */
#define C_HS 4 /* for Hesiod name server (MIT) (XXX) */
/* Query class values which do not appear in resource records */
#define C_ANY 255 /* wildcard match */
#define C_QU 0x8000 /* mDNS QU flag in queries */
#define C_CACHE_FLUSH 0x8000 /* mDNS cache flush flag in replies */
/*
* Status return codes for T_UNSPEC conversion routines
*/
#define CONV_SUCCESS 0
#define CONV_OVERFLOW -1
#define CONV_BADFMT -2
#define CONV_BADCKSUM -3
#define CONV_BADBUFLEN -4
/*
* Structure for query header.
*/
typedef struct {
uint16_t id; /* query identification number */
uint8_t flags1; /* first byte of flags */
uint8_t flags2; /* second byte of flags */
uint16_t qdcount; /* number of question entries */
uint16_t ancount; /* number of answer entries */
uint16_t nscount; /* number of authority entries */
uint16_t arcount; /* number of resource entries */
} HEADER;
/*
* Macros for subfields of flag fields.
*/
#define DNS_QR(np) ((np)->flags1 & 0x80) /* response flag */
#define DNS_OPCODE(np) ((((np)->flags1) >> 3) & 0xF) /* purpose of message */
#define DNS_AA(np) ((np)->flags1 & 0x04) /* authoritative answer */
#define DNS_TC(np) ((np)->flags1 & 0x02) /* truncated message */
#define DNS_RD(np) ((np)->flags1 & 0x01) /* recursion desired */
#define DNS_RA(np) ((np)->flags2 & 0x80) /* recursion available */
#define DNS_AD(np) ((np)->flags2 & 0x20) /* authentic data from named */
#define DNS_CD(np) ((np)->flags2 & 0x10) /* checking disabled by resolver */
#define DNS_RCODE(np) ((np)->flags2 & 0xF) /* response code */
/*
* Defines for handling compressed domain names, EDNS0 labels, etc.
*/
#define INDIR_MASK 0xc0 /* 11.... */
#define EDNS0_MASK 0x40 /* 01.... */
# define EDNS0_ELT_BITLABEL 0x01
/*
* Structure for passing resource records around.
*/
struct rrec {
int16_t r_zone; /* zone number */
int16_t r_class; /* class number */
int16_t r_type; /* type number */
uint32_t r_ttl; /* time to live */
int r_size; /* size of data area */
char *r_data; /* pointer to data */
};
/*
* Inline versions of get/put short/long. Pointer is advanced.
* We also assume that a "uint16_t" holds 2 "chars"
* and that a "uint32_t" holds 4 "chars".
*
* These macros demonstrate the property of C whereby it can be
* portable or it can be elegant but never both.
*/
#define GETSHORT(s, cp) { \
register u_char *t_cp = (u_char *)(cp); \
(s) = ((uint16_t)t_cp[0] << 8) | (uint16_t)t_cp[1]; \
(cp) += 2; \
}
#define GETLONG(l, cp) { \
register u_char *t_cp = (u_char *)(cp); \
(l) = (((uint32_t)t_cp[0]) << 24) \
| (((uint32_t)t_cp[1]) << 16) \
| (((uint32_t)t_cp[2]) << 8) \
| (((uint32_t)t_cp[3])); \
(cp) += 4; \
}
#define PUTSHORT(s, cp) { \
register uint16_t t_s = (uint16_t)(s); \
register u_char *t_cp = (u_char *)(cp); \
*t_cp++ = t_s >> 8; \
*t_cp = t_s; \
(cp) += 2; \
}
/*
* Warning: PUTLONG --no-longer-- destroys its first argument. if you
* were depending on this "feature", you will lose.
*/
#define PUTLONG(l, cp) { \
register uint32_t t_l = (uint32_t)(l); \
register u_char *t_cp = (u_char *)(cp); \
*t_cp++ = t_l >> 24; \
*t_cp++ = t_l >> 16; \
*t_cp++ = t_l >> 8; \
*t_cp = t_l; \
(cp) += 4; \
}
#endif /* !_NAMESER_H_ */