nameser.h

/*  $NetBSD: nameser.h,v 1.19.4.1 2007/05/17 21:25:12 jdc Exp $ */

/*
 * 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. 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.
 */

/*
 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
 * Copyright (c) 1996-1999 by Internet Software Consortium.
 *
 * 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.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC 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.
 */

/*
 *  Id: nameser.h,v 1.7.18.1 2005/04/27 05:00:50 sra Exp
 */

#ifndef _ARPA_NAMESER_H_
#define _ARPA_NAMESER_H_

#define BIND_4_COMPAT

#include <sys/param.h>
#if (!defined(BSD)) || (BSD < 199306)
# include <sys/bitypes.h>
#else
# include <sys/types.h>
#endif
#include <sys/EfiCdefs.h>

/*%
 * Revision information.  This is the release date in YYYYMMDD format.
 * It can change every day so the right thing to do with it is use it
 * in preprocessor commands such as "#if (__NAMESER > 19931104)".  Do not
 * compare for equality; rather, use it to determine whether your libbind.a
 * contains a new enough lib/nameser/ to support the feature you need.
 */

#define __NAMESER 19991006  /*%< New interface version stamp. */

/*
 * Define constants based on RFC0883, RFC1034, RFC 1035
 */
#define NS_PACKETSZ 512 /*%< default UDP packet size */
#define NS_MAXDNAME 1025  /*%< maximum domain name */
#define NS_MAXMSG 65535 /*%< maximum message size */
#define NS_MAXCDNAME  255 /*%< maximum compressed domain name */
#define NS_MAXLABEL 63  /*%< maximum length of domain label */
#define NS_HFIXEDSZ 12  /*%< #/bytes of fixed data in header */
#define NS_QFIXEDSZ 4 /*%< #/bytes of fixed data in query */
#define NS_RRFIXEDSZ  10  /*%< #/bytes of fixed data in r record */
#define NS_INT32SZ  4 /*%< #/bytes of data in a u_int32_t */
#define NS_INT16SZ  2 /*%< #/bytes of data in a u_int16_t */
#define NS_INT8SZ 1 /*%< #/bytes of data in a u_int8_t */
#define NS_INADDRSZ 4 /*%< IPv4 T_A */
#define NS_IN6ADDRSZ  16  /*%< IPv6 T_AAAA */
#define NS_CMPRSFLGS  0xc0  /*%< Flag bits indicating name compression. */
#define NS_DEFAULTPORT  53  /*%< For both TCP and UDP. */

/*
 * These can be expanded with synonyms, just keep ns_parse.c:ns_parserecord()
 * in synch with it.
 */
typedef enum __ns_sect {
  ns_s_qd = 0,    /*%< Query: Question. */
  ns_s_zn = 0,    /*%< Update: Zone. */
  ns_s_an = 1,    /*%< Query: Answer. */
  ns_s_pr = 1,    /*%< Update: Prerequisites. */
  ns_s_ns = 2,    /*%< Query: Name servers. */
  ns_s_ud = 2,    /*%< Update: Update. */
  ns_s_ar = 3,    /*%< Query|Update: Additional records. */
  ns_s_max = 4
} ns_sect;

/*%
 * This is a message handle.  It is caller allocated and has no dynamic data.
 * This structure is intended to be opaque to all but ns_parse.c, thus the
 * leading _'s on the member names.  Use the accessor functions, not the _'s.
 */
typedef struct __ns_msg {
  const u_char  *_msg, *_eom;
  uint16_t  _id, _flags, _counts[ns_s_max];
  const u_char  *_sections[ns_s_max];
  ns_sect   _sect;
  int   _rrnum;
  const u_char  *_msg_ptr;
} ns_msg;

/* Private data structure - do not use from outside library. */
struct _ns_flagdata {  int mask, shift;  };
extern struct _ns_flagdata _ns_flagdata[];

/* Accessor macros - this is part of the public interface. */
#define ns_msg_getflag(handle, flag) ( \
      ((handle)._flags & _ns_flagdata[flag].mask) \
       >> _ns_flagdata[flag].shift \
      )

#define ns_msg_id(handle) ((handle)._id + 0)
#define ns_msg_base(handle) ((handle)._msg + 0)
#define ns_msg_end(handle) ((handle)._eom + 0)
#define ns_msg_size(handle) ((size_t)((handle)._eom - (handle)._msg))
#define ns_msg_count(handle, section) ((handle)._counts[section] + 0)

/*%
 * This is a parsed record.  It is caller allocated and has no dynamic data.
 */
typedef struct __ns_rr {
  char    name[NS_MAXDNAME];
  uint16_t  type;
  uint16_t  rr_class;
  uint32_t  ttl;
  uint16_t  rdlength;
  const u_char *  rdata;
} ns_rr;

/* Accessor macros - this is part of the public interface. */
#define ns_rr_name(rr)  (((rr).name[0] != '\0') ? (rr).name : ".")
#define ns_rr_type(rr)  ((ns_type)((rr).type + 0))
#define ns_rr_class(rr) ((ns_class)((rr).rr_class + 0))
#define ns_rr_ttl(rr) ((u_long)(rr).ttl + 0)
#define ns_rr_rdlen(rr) ((size_t)(rr).rdlength + 0)
#define ns_rr_rdata(rr) ((rr).rdata + 0)

/*%
 * These don't have to be in the same order as in the packet flags word,
 * and they can even overlap in some cases, but they will need to be kept
 * in synch with ns_parse.c:ns_flagdata[].
 */
typedef enum __ns_flag {
  ns_f_qr,    /*%< Question/Response. */
  ns_f_opcode,    /*%< Operation code. */
  ns_f_aa,    /*%< Authoritative Answer. */
  ns_f_tc,    /*%< Truncation occurred. */
  ns_f_rd,    /*%< Recursion Desired. */
  ns_f_ra,    /*%< Recursion Available. */
  ns_f_z,     /*%< MBZ. */
  ns_f_ad,    /*%< Authentic Data (DNSSEC). */
  ns_f_cd,    /*%< Checking Disabled (DNSSEC). */
  ns_f_rcode,   /*%< Response code. */
  ns_f_max
} ns_flag;

/*%
 * Currently defined opcodes.
 */
typedef enum __ns_opcode {
  ns_o_query = 0,   /*%< Standard query. */
  ns_o_iquery = 1,  /*%< Inverse query (deprecated/unsupported). */
  ns_o_status = 2,  /*%< Name server status query (unsupported). */
        /* Opcode 3 is undefined/reserved. */
  ns_o_notify = 4,  /*%< Zone change notification. */
  ns_o_update = 5,  /*%< Zone update message. */
  ns_o_max = 6
} ns_opcode;

/*%
 * Currently defined response codes.
 */
typedef enum __ns_rcode {
  ns_r_noerror = 0, /*%< No error occurred. */
  ns_r_formerr = 1, /*%< Format error. */
  ns_r_servfail = 2,  /*%< Server failure. */
  ns_r_nxdomain = 3,  /*%< Name error. */
  ns_r_notimpl = 4, /*%< Unimplemented. */
  ns_r_refused = 5, /*%< Operation refused. */
  /* these are for BIND_UPDATE */
  ns_r_yxdomain = 6,  /*%< Name exists */
  ns_r_yxrrset = 7, /*%< RRset exists */
  ns_r_nxrrset = 8, /*%< RRset does not exist */
  ns_r_notauth = 9, /*%< Not authoritative for zone */
  ns_r_notzone = 10,  /*%< Zone of record different from zone section */
  ns_r_max = 11,
  /* The following are EDNS extended rcodes */
  ns_r_badvers = 16,
  /* The following are TSIG errors */
  ns_r_badsig = 16,
  ns_r_badkey = 17,
  ns_r_badtime = 18
} ns_rcode;

/* BIND_UPDATE */
typedef enum __ns_update_operation {
  ns_uop_delete = 0,
  ns_uop_add = 1,
  ns_uop_max = 2
} ns_update_operation;

/*
 * This RR-like structure is particular to UPDATE.
 */
struct _ns_updrec {
  struct _ns_updrec *r_prev; /* prev record */
  struct _ns_updrec *r_next; /* next record */
  u_int8_t  r_section;  /* ZONE/PREREQUISITE/UPDATE */
  char *    r_dname;  /* owner of the RR */
  u_int16_t r_class;  /* class number */
  u_int16_t r_type;   /* type number */
  u_int32_t r_ttl;    /* time to live */
  u_char *  r_data;   /* rdata fields as text string */
  u_int16_t r_size;   /* size of r_data field */
  int   r_opcode; /* type of operation */
  /* following fields for private use by the resolver/server routines */
  struct _ns_updrec *r_grpnext;  /* next record when grouped */
  struct databuf *r_dp;   /* databuf to process */
  struct databuf *r_deldp;  /* databuf's deleted/overwritten */
  u_int16_t r_zone;   /* zone number on server */
};
typedef struct _ns_updrec ns_updrec;

/*%
 * This structure is used for TSIG authenticated messages
 */
struct ns_tsig_key {
        char name[NS_MAXDNAME], alg[NS_MAXDNAME];
        unsigned char *data;
        int len;
};
typedef struct ns_tsig_key ns_tsig_key;

/*%
 * This structure is used for TSIG authenticated TCP messages
 */
struct ns_tcp_tsig_state {
  int counter;
  struct dst_key *key;
  void *ctx;
  unsigned char sig[NS_PACKETSZ];
  int siglen;
};
typedef struct ns_tcp_tsig_state ns_tcp_tsig_state;

#define NS_TSIG_FUDGE 300
#define NS_TSIG_TCP_COUNT 100
#define NS_TSIG_ALG_HMAC_MD5 "HMAC-MD5.SIG-ALG.REG.INT"

#define NS_TSIG_ERROR_NO_TSIG -10
#define NS_TSIG_ERROR_NO_SPACE -11
#define NS_TSIG_ERROR_FORMERR -12

/*%
 * Currently defined type values for resources and queries.
 */
typedef enum __ns_type {
  ns_t_invalid = 0, /*%< Cookie. */
  ns_t_a = 1,   /*%< Host address. */
  ns_t_ns = 2,    /*%< Authoritative server. */
  ns_t_md = 3,    /*%< Mail destination. */
  ns_t_mf = 4,    /*%< Mail forwarder. */
  ns_t_cname = 5,   /*%< Canonical name. */
  ns_t_soa = 6,   /*%< Start of authority zone. */
  ns_t_mb = 7,    /*%< Mailbox domain name. */
  ns_t_mg = 8,    /*%< Mail group member. */
  ns_t_mr = 9,    /*%< Mail rename name. */
  ns_t_null = 10,   /*%< Null resource record. */
  ns_t_wks = 11,    /*%< Well known service. */
  ns_t_ptr = 12,    /*%< Domain name pointer. */
  ns_t_hinfo = 13,  /*%< Host information. */
  ns_t_minfo = 14,  /*%< Mailbox information. */
  ns_t_mx = 15,   /*%< Mail routing information. */
  ns_t_txt = 16,    /*%< Text strings. */
  ns_t_rp = 17,   /*%< Responsible person. */
  ns_t_afsdb = 18,  /*%< AFS cell database. */
  ns_t_x25 = 19,    /*%< X_25 calling address. */
  ns_t_isdn = 20,   /*%< ISDN calling address. */
  ns_t_rt = 21,   /*%< Router. */
  ns_t_nsap = 22,   /*%< NSAP address. */
  ns_t_nsap_ptr = 23, /*%< Reverse NSAP lookup (deprecated). */
  ns_t_sig = 24,    /*%< Security signature. */
  ns_t_key = 25,    /*%< Security key. */
  ns_t_px = 26,   /*%< X.400 mail mapping. */
  ns_t_gpos = 27,   /*%< Geographical position (withdrawn). */
  ns_t_aaaa = 28,   /*%< Ip6 Address. */
  ns_t_loc = 29,    /*%< Location Information. */
  ns_t_nxt = 30,    /*%< Next domain (security). */
  ns_t_eid = 31,    /*%< Endpoint identifier. */
  ns_t_nimloc = 32, /*%< Nimrod Locator. */
  ns_t_srv = 33,    /*%< Server Selection. */
  ns_t_atma = 34,   /*%< ATM Address */
  ns_t_naptr = 35,  /*%< Naming Authority PoinTeR */
  ns_t_kx = 36,   /*%< Key Exchange */
  ns_t_cert = 37,   /*%< Certification record */
  ns_t_a6 = 38,   /*%< IPv6 address (deprecates AAAA) */
  ns_t_dname = 39,  /*%< Non-terminal DNAME (for IPv6) */
  ns_t_sink = 40,   /*%< Kitchen sink (experimentatl) */
  ns_t_opt = 41,    /*%< EDNS0 option (meta-RR) */
  ns_t_apl = 42,    /*%< Address prefix list (RFC3123) */
  ns_t_tkey = 249,  /*%< Transaction key */
  ns_t_tsig = 250,  /*%< Transaction signature. */
  ns_t_ixfr = 251,  /*%< Incremental zone transfer. */
  ns_t_axfr = 252,  /*%< Transfer zone of authority. */
  ns_t_mailb = 253, /*%< Transfer mailbox records. */
  ns_t_maila = 254, /*%< Transfer mail agent records. */
  ns_t_any = 255,   /*%< Wildcard match. */
  ns_t_zxfr = 256,  /*%< BIND-specific, nonstandard. */
  ns_t_max = 65536
} ns_type;

/* Exclusively a QTYPE? (not also an RTYPE) */
#define ns_t_qt_p(t) (ns_t_xfr_p(t) || (t) == ns_t_any || \
          (t) == ns_t_mailb || (t) == ns_t_maila)
/* Some kind of meta-RR? (not a QTYPE, but also not an RTYPE) */
#define ns_t_mrr_p(t) ((t) == ns_t_tsig || (t) == ns_t_opt)
/* Exclusively an RTYPE? (not also a QTYPE or a meta-RR) */
#define ns_t_rr_p(t) (!ns_t_qt_p(t) && !ns_t_mrr_p(t))
#define ns_t_udp_p(t) ((t) != ns_t_axfr && (t) != ns_t_zxfr)
#define ns_t_xfr_p(t) ((t) == ns_t_axfr || (t) == ns_t_ixfr || \
           (t) == ns_t_zxfr)

/*%
 * Values for class field
 */
typedef enum __ns_class {
  ns_c_invalid = 0, /*%< Cookie. */
  ns_c_in = 1,    /*%< Internet. */
  ns_c_2 = 2,   /*%< unallocated/unsupported. */
  ns_c_chaos = 3,   /*%< MIT Chaos-net. */
  ns_c_hs = 4,    /*%< MIT Hesiod. */
  /* Query class values which do not appear in resource records */
  ns_c_none = 254,  /*%< for prereq. sections in update requests */
  ns_c_any = 255,   /*%< Wildcard match. */
  ns_c_max = 65536
} ns_class;

/* DNSSEC constants. */

typedef enum __ns_key_types {
  ns_kt_rsa = 1,    /*%< key type RSA/MD5 */
  ns_kt_dh  = 2,    /*%< Diffie Hellman */
  ns_kt_dsa = 3,    /*%< Digital Signature Standard (MANDATORY) */
  ns_kt_private = 254 /*%< Private key type starts with OID */
} ns_key_types;

typedef enum __ns_cert_types {
  cert_t_pkix = 1,  /*%< PKIX (X.509v3) */
  cert_t_spki = 2,  /*%< SPKI */
  cert_t_pgp  = 3,  /*%< PGP */
  cert_t_url  = 253,  /*%< URL private type */
  cert_t_oid  = 254 /*%< OID private type */
} ns_cert_types;

/* Flags field of the KEY RR rdata. */
#define NS_KEY_TYPEMASK   0xC000  /*%< Mask for "type" bits */
#define NS_KEY_TYPE_AUTH_CONF 0x0000  /*%< Key usable for both */
#define NS_KEY_TYPE_CONF_ONLY 0x8000  /*%< Key usable for confidentiality */
#define NS_KEY_TYPE_AUTH_ONLY 0x4000  /*%< Key usable for authentication */
#define NS_KEY_TYPE_NO_KEY  0xC000  /*%< No key usable for either; no key */
/* The type bits can also be interpreted independently, as single bits: */
#define NS_KEY_NO_AUTH    0x8000  /*%< Key unusable for authentication */
#define NS_KEY_NO_CONF    0x4000  /*%< Key unusable for confidentiality */
#define NS_KEY_RESERVED2  0x2000  /* Security is *mandatory* if bit=0 */
#define NS_KEY_EXTENDED_FLAGS 0x1000  /*%< reserved - must be zero */
#define NS_KEY_RESERVED4  0x0800  /*%< reserved - must be zero */
#define NS_KEY_RESERVED5  0x0400  /*%< reserved - must be zero */
#define NS_KEY_NAME_TYPE  0x0300  /*%< these bits determine the type */
#define NS_KEY_NAME_USER  0x0000  /*%< key is assoc. with user */
#define NS_KEY_NAME_ENTITY  0x0200  /*%< key is assoc. with entity eg host */
#define NS_KEY_NAME_ZONE  0x0100  /*%< key is zone key */
#define NS_KEY_NAME_RESERVED  0x0300  /*%< reserved meaning */
#define NS_KEY_RESERVED8  0x0080  /*%< reserved - must be zero */
#define NS_KEY_RESERVED9  0x0040  /*%< reserved - must be zero */
#define NS_KEY_RESERVED10 0x0020  /*%< reserved - must be zero */
#define NS_KEY_RESERVED11 0x0010  /*%< reserved - must be zero */
#define NS_KEY_SIGNATORYMASK  0x000F  /*%< key can sign RR's of same name */
#define NS_KEY_RESERVED_BITMASK ( NS_KEY_RESERVED2 | \
          NS_KEY_RESERVED4 | \
          NS_KEY_RESERVED5 | \
          NS_KEY_RESERVED8 | \
          NS_KEY_RESERVED9 | \
          NS_KEY_RESERVED10 | \
          NS_KEY_RESERVED11 )
#define NS_KEY_RESERVED_BITMASK2 0xFFFF /*%< no bits defined here */

/* The Algorithm field of the KEY and SIG RR's is an integer, {1..254} */
#define NS_ALG_MD5RSA   1 /*%< MD5 with RSA */
#define NS_ALG_DH               2 /*%< Diffie Hellman KEY */
#define NS_ALG_DSA              3 /*%< DSA KEY */
#define NS_ALG_DSS              NS_ALG_DSA
#define NS_ALG_EXPIRE_ONLY  253 /*%< No alg, no security */
#define NS_ALG_PRIVATE_OID  254 /*%< Key begins with OID giving alg */

/* Protocol values  */
/* value 0 is reserved */
#define NS_KEY_PROT_TLS         1
#define NS_KEY_PROT_EMAIL       2
#define NS_KEY_PROT_DNSSEC      3
#define NS_KEY_PROT_IPSEC       4
#define NS_KEY_PROT_ANY   255

/* Signatures */
#define NS_MD5RSA_MIN_BITS   512  /*%< Size of a mod or exp in bits */
#define NS_MD5RSA_MAX_BITS  4096
  /* Total of binary mod and exp */
#define NS_MD5RSA_MAX_BYTES ((NS_MD5RSA_MAX_BITS+7/8)*2+3)
  /* Max length of text sig block */
#define NS_MD5RSA_MAX_BASE64  (((NS_MD5RSA_MAX_BYTES+2)/3)*4)
#define NS_MD5RSA_MIN_SIZE  ((NS_MD5RSA_MIN_BITS+7)/8)
#define NS_MD5RSA_MAX_SIZE  ((NS_MD5RSA_MAX_BITS+7)/8)

#define NS_DSA_SIG_SIZE         41
#define NS_DSA_MIN_SIZE         213
#define NS_DSA_MAX_BYTES        405

/* Offsets into SIG record rdata to find various values */
#define NS_SIG_TYPE 0 /*%< Type flags */
#define NS_SIG_ALG  2 /*%< Algorithm */
#define NS_SIG_LABELS 3 /*%< How many labels in name */
#define NS_SIG_OTTL 4 /*%< Original TTL */
#define NS_SIG_EXPIR  8 /*%< Expiration time */
#define NS_SIG_SIGNED 12  /*%< Signature time */
#define NS_SIG_FOOT 16  /*%< Key footprint */
#define NS_SIG_SIGNER 18  /*%< Domain name of who signed it */

/* How RR types are represented as bit-flags in NXT records */
#define NS_NXT_BITS 8
#define NS_NXT_BIT_SET(  n,p) (p[(n)/NS_NXT_BITS] |=  (0x80>>((n)%NS_NXT_BITS)))
#define NS_NXT_BIT_CLEAR(n,p) (p[(n)/NS_NXT_BITS] &= ~(0x80>>((n)%NS_NXT_BITS)))
#define NS_NXT_BIT_ISSET(n,p) (p[(n)/NS_NXT_BITS] &   (0x80>>((n)%NS_NXT_BITS)))
#define NS_NXT_MAX 127

/*%
 * EDNS0 extended flags, host order.
 */
#define NS_OPT_DNSSEC_OK  0x8000U

/*%
 * Inline versions of get/put short/long.  Pointer is advanced.
 */
#define NS_GET16(s, cp) do { \
  const u_char *t_cp = (const u_char *)(cp); \
  (s) = ((uint16_t)t_cp[0] << 8) \
      | ((uint16_t)t_cp[1]) \
      ; \
  (cp) += NS_INT16SZ; \
} while (/*CONSTCOND*/0)

#define NS_GET32(l, cp) do { \
  const u_char *t_cp = (const 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) += NS_INT32SZ; \
} while (/*CONSTCOND*/0)

#define NS_PUT16(s, cp) do { \
  uint32_t t_s = (uint32_t)(s); \
  u_char *t_cp = (u_char *)(cp); \
  *t_cp++ = (u_char)( t_s >> 8 ); \
  *t_cp   = (u_char)( t_s ); \
  (cp) += NS_INT16SZ; \
} while (/*CONSTCOND*/0)

#define NS_PUT32(l, cp) do { \
  uint32_t t_l = (uint32_t)(l); \
  u_char *t_cp = (u_char *)(cp); \
  *t_cp++ = (u_char)( t_l >> 24 ); \
  *t_cp++ = (u_char)( t_l >> 16 ); \
  *t_cp++ = (u_char)( t_l >> 8 ); \
  *t_cp   = (u_char)( t_l ); \
  (cp) += NS_INT32SZ; \
} while (/*CONSTCOND*/0)

/*%
 * ANSI C identifier hiding for bind's lib/nameser.
 */
#define ns_get16    __ns_get16
#define ns_get32    __ns_get32
#define ns_put16    __ns_put16
#define ns_put32    __ns_put32
#define ns_initparse    __ns_initparse
#define ns_skiprr   __ns_skiprr
#define ns_parserr    __ns_parserr
#define ns_sprintrr   __ns_sprintrr
#define ns_sprintrrf    __ns_sprintrrf
#define ns_format_ttl   __ns_format_ttl
#define ns_parse_ttl    __ns_parse_ttl
#define ns_datetosecs   __ns_datetosecs
#define ns_name_ntol    __ns_name_ntol
#define ns_name_ntop    __ns_name_ntop
#define ns_name_pton    __ns_name_pton
#define ns_name_unpack    __ns_name_unpack
#define ns_name_pack    __ns_name_pack
#define ns_name_compress  __ns_name_compress
#define ns_name_uncompress  __ns_name_uncompress
#define ns_name_skip    __ns_name_skip
#define ns_name_rollback  __ns_name_rollback
#define ns_sign     __ns_sign
#define ns_sign2    __ns_sign2
#define ns_sign_tcp   __ns_sign_tcp
#define ns_sign_tcp2    __ns_sign_tcp2
#define ns_sign_tcp_init  __ns_sign_tcp_init
#define ns_find_tsig    __ns_find_tsig
#define ns_verify   __ns_verify
#define ns_verify_tcp   __ns_verify_tcp
#define ns_verify_tcp_init  __ns_verify_tcp_init
#define ns_samedomain   __ns_samedomain
#define ns_subdomain    __ns_subdomain
#define ns_makecanon    __ns_makecanon
#define ns_samename   __ns_samename

__BEGIN_DECLS
uint16_t  ns_get16(const u_char *);
uint32_t  ns_get32(const u_char *);
void    ns_put16(uint16_t, u_char *);
void    ns_put32(uint32_t, u_char *);
int   ns_initparse(const u_char *, int, ns_msg *);
int   ns_skiprr(const u_char *, const u_char *, ns_sect, int);
int   ns_parserr(ns_msg *, ns_sect, int, ns_rr *);
int   ns_sprintrr(const ns_msg *, const ns_rr *,
         const char *, const char *, char *, size_t);
int   ns_sprintrrf(const u_char *, size_t, const char *,
          ns_class, ns_type, u_long, const u_char *,
          size_t, const char *, const char *,
          char *, size_t);
int   ns_format_ttl(u_long, char *, size_t);
int   ns_parse_ttl(const char *, u_long *);
uint32_t  ns_datetosecs(const char *cp, int *errp);
int   ns_name_ntol(const u_char *, u_char *, size_t);
int   ns_name_ntop(const u_char *, char *, size_t);
int   ns_name_pton(const char *, u_char *, size_t);
int   ns_name_unpack(const u_char *, const u_char *,
            const u_char *, u_char *, size_t);
int   ns_name_pack(const u_char *, u_char *, int,
          const u_char **, const u_char **);
int   ns_name_uncompress(const u_char *, const u_char *,
          const u_char *, char *, size_t);
int   ns_name_compress(const char *, u_char *, size_t,
              const u_char **, const u_char **);
int   ns_name_skip(const u_char **, const u_char *);
void    ns_name_rollback(const u_char *, const u_char **,
              const u_char **);
int   ns_sign(u_char *, int *, int, int, void *,
           const u_char *, int, u_char *, int *, time_t);
int   ns_sign2(u_char *, int *, int, int, void *,
            const u_char *, int, u_char *, int *, time_t,
            u_char **, u_char **);
int   ns_sign_tcp(u_char *, int *, int, int,
         ns_tcp_tsig_state *, int);
int   ns_sign_tcp2(u_char *, int *, int, int,
          ns_tcp_tsig_state *, int,
          u_char **, u_char **);
int   ns_sign_tcp_init(void *, const u_char *, int,
          ns_tcp_tsig_state *);
u_char    *ns_find_tsig(u_char *, u_char *);
int   ns_verify(u_char *, int *, void *,
             const u_char *, int, u_char *, int *,
             time_t *, int);
int   ns_verify_tcp(u_char *, int *, ns_tcp_tsig_state *, int);
int   ns_verify_tcp_init(void *, const u_char *, int,
          ns_tcp_tsig_state *);
int   ns_samedomain(const char *, const char *);
int   ns_subdomain(const char *, const char *);
int   ns_makecanon(const char *, char *, size_t);
int   ns_samename(const char *, const char *);
__END_DECLS

#ifdef BIND_4_COMPAT
#include <arpa/nameser_compat.h>
#endif

#endif /* !_ARPA_NAMESER_H_ */