/*-
 * SPDX-License-Identifier: (ISC AND BSD-3-Clause)
 *
 * Portions Copyright (C) 2004, 2005, 2008, 2009  Internet Systems Consortium, Inc. ("ISC")
 * Portions Copyright (C) 1996-2003  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and/or 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.
 */

/*-
 * 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.
 */

/*
 *      $Id: nameser.h,v 1.16 2009/03/03 01:52:48 each Exp $
 */

#ifndef _ARPA_NAMESER_H_
#define _ARPA_NAMESER_H_

/*! \file */

#define BIND_4_COMPAT

#include <sys/param.h>
#include <sys/types.h>
#include <sys/cdefs.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       20090302        /*%< 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 (presentation format)*/
#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_MAXLABELS    128     /*%< theoretical max #/labels per domain name */
#define NS_MAXNNAME     256     /*%< maximum uncompressed (binary) domain name*/
#define NS_MAXPADDR     (sizeof "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")
#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;

/*%
 * Network name (compressed or not) type.  Equivalent to a pointer when used
 * in a function prototype.  Can be const'd.
 */
typedef u_char ns_nname[NS_MAXNNAME];
typedef const u_char *ns_nname_ct;
typedef u_char *ns_nname_t;

struct ns_namemap { ns_nname_ct base; int len; };
typedef struct ns_namemap *ns_namemap_t;
typedef const struct ns_namemap *ns_namemap_ct;

/*%
 * 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;
        u_int16_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_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) ((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];
        u_int16_t       type;
        u_int16_t       rr_class;
        u_int32_t       ttl;
        u_int16_t       rdlength;
        const u_char *  rdata;
} ns_rr;

/*
 * Same thing, but using uncompressed network binary names, and real C types.
 */
typedef struct __ns_rr2 {
        ns_nname        nname;
        size_t          nnamel;
        int             type;
        int             rr_class;
        u_int           ttl;
        int             rdlength;
        const u_char *  rdata;
} ns_rr2;

/* Accessor macros - this is part of the public interface. */
#define ns_rr_name(rr)  (((rr).name[0] != '\0') ? (rr).name : ".")
#define ns_rr_nname(rr) ((const ns_nname_t)(rr).nname)
#define ns_rr_nnamel(rr) ((rr).nnamel + 0)
#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)   ((rr).ttl + 0)
#define ns_rr_rdlen(rr) ((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 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,         /*%< IPv6 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 (experimental) */
        ns_t_dname = 39,        /*%< Non-terminal DNAME */
        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_ds = 43,           /*%< Delegation Signer */
        ns_t_sshfp = 44,        /*%< SSH Fingerprint */
        ns_t_ipseckey = 45,     /*%< IPSEC Key */
        ns_t_rrsig = 46,        /*%< RRset Signature */
        ns_t_nsec = 47,         /*%< Negative security */
        ns_t_dnskey = 48,       /*%< DNS Key */
        ns_t_dhcid = 49,        /*%< Dynamic host configuratin identifier */
        ns_t_nsec3 = 50,        /*%< Negative security type 3 */
        ns_t_nsec3param = 51,   /*%< Negative security type 3 parameters */
        ns_t_hip = 55,          /*%< Host Identity Protocol */
        ns_t_spf = 99,          /*%< Sender Policy Framework */
        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_dlv = 32769,       /*%< DNSSEC look-aside validatation. */
        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 and option codes, host order.
 */
#define NS_OPT_DNSSEC_OK        0x8000U
#define NS_OPT_NSID             3

/*%
 * Inline versions of get/put short/long.  Pointer is advanced.
 */
#define NS_GET16(s, cp) do { \
        register const u_char *t_cp = (const u_char *)(cp); \
        (s) = ((u_int16_t)t_cp[0] << 8) \
            | ((u_int16_t)t_cp[1]) \
            ; \
        (cp) += NS_INT16SZ; \
} while (0)

#define NS_GET32(l, cp) do { \
        register const u_char *t_cp = (const u_char *)(cp); \
        (l) = ((u_int32_t)t_cp[0] << 24) \
            | ((u_int32_t)t_cp[1] << 16) \
            | ((u_int32_t)t_cp[2] << 8) \
            | ((u_int32_t)t_cp[3]) \
            ; \
        (cp) += NS_INT32SZ; \
} while (0)

#define NS_PUT16(s, cp) do { \
        register u_int16_t t_s = (u_int16_t)(s); \
        register u_char *t_cp = (u_char *)(cp); \
        *t_cp++ = t_s >> 8; \
        *t_cp   = t_s; \
        (cp) += NS_INT16SZ; \
} while (0)

#define NS_PUT32(l, cp) do { \
        register u_int32_t t_l = (u_int32_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) += NS_INT32SZ; \
} while (0)

/*%
 * ANSI C identifier hiding for bind's lib/nameser.
 */
#define ns_msg_getflag          __ns_msg_getflag
#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_parserr2             __ns_parserr2
#define ns_sprintrr             __ns_sprintrr
#define ns_sprintrrf            __ns_sprintrrf
#define ns_format_ttl           __ns_format_ttl
#define ns_parse_ttl            __ns_parse_ttl
#if 0
#define ns_datetosecs           __ns_datetosecs
#endif
#define ns_name_ntol            __ns_name_ntol
#define ns_name_ntop            __ns_name_ntop
#define ns_name_pton            __ns_name_pton
#define ns_name_pton2           __ns_name_pton2
#define ns_name_unpack          __ns_name_unpack
#define ns_name_unpack2         __ns_name_unpack2
#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_name_length          __ns_name_length
#define ns_name_eq              __ns_name_eq
#define ns_name_owned           __ns_name_owned
#define ns_name_map             __ns_name_map
#define ns_name_labels          __ns_name_labels
#if 0
#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
#endif
#define ns_samedomain           __ns_samedomain
#if 0
#define ns_subdomain            __ns_subdomain
#endif
#define ns_makecanon            __ns_makecanon
#define ns_samename             __ns_samename

__BEGIN_DECLS
int             ns_msg_getflag(ns_msg, int);
u_int           ns_get16(const u_char *);
u_long          ns_get32(const u_char *);
void            ns_put16(u_int, u_char *);
void            ns_put32(u_long, 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_parserr2(ns_msg *, ns_sect, int, ns_rr2 *);
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 *);
#if 0
u_int32_t       ns_datetosecs(const char *cp, int *errp);
#endif
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_pton2(const char *, u_char *, size_t, size_t *);
int             ns_name_unpack(const u_char *, const u_char *,
                               const u_char *, u_char *, size_t);
int             ns_name_unpack2(const u_char *, const u_char *,
                                const u_char *, u_char *, size_t,
                                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 **);
ssize_t         ns_name_length(ns_nname_ct, size_t);
int             ns_name_eq(ns_nname_ct, size_t, ns_nname_ct, size_t);
int             ns_name_owned(ns_namemap_ct, int, ns_namemap_ct, int);
int             ns_name_map(ns_nname_ct, size_t, ns_namemap_t, int);
int             ns_name_labels(ns_nname_ct, size_t);
#if 0
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 *);
#endif
int             ns_samedomain(const char *, const char *);
#if 0
int             ns_subdomain(const char *, const char *);
#endif
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_ */
/*! \file */