/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 * Copyright (c) 2016, Chris Fraire <cfraire@me.com>.
 */

/*
 * 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.
 */

/*
 * 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.
 */

/*
 *      $Id: nameser.h,v 8.50 2003/05/27 23:36:52 marka Exp $
 */

#ifndef _ARPA_NAMESER_H
#define _ARPA_NAMESER_H

#include <sys/isa_defs.h>


#ifdef  __cplusplus
extern "C" {
#endif

#define BIND_4_COMPAT

/*
 * 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 libresolv
 * contains a new enough lib/nameser/ to support the feature you need.
 */

#define __NAMESER       20090302        /* New interface version stamp. */

/*
 * Define constants based on RFC 883, RFC 1034, 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_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 uchar_t ns_nname[NS_MAXNNAME];
typedef const uchar_t *ns_nname_ct;
typedef uchar_t *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 uchar_t   *_msg, *_eom;
        uint16_t        _id, _flags, _counts[ns_s_max];
        const uchar_t   *_sections[ns_s_max];
        ns_sect         _sect;
        int             _rrnum;
        const uchar_t   *_msg_ptr;
} ns_msg;

/*
 * This is a newmsg handle, used when constructing new messages with
 * ns_newmsg_init, et al.
 */
struct ns_newmsg {
        ns_msg          msg;
        const uchar_t   *dnptrs[25];
        const uchar_t   **lastdnptr;
};
typedef struct ns_newmsg ns_newmsg;

/* 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];
        uint16_t        type;
        uint16_t        rr_class;
        uint32_t        ttl;
        uint16_t        rdlength;
        const uchar_t   *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;
        uint_t          ttl;
        int             rdlength;
        const uchar_t   *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 RR-like structure is particular to UPDATE.
 */
struct ns_updrec {
        struct ns_updrec *r_prev;       /* prev record */
        struct ns_updrec *r_next;       /* next record */
        uint8_t         r_section;      /* ZONE/PREREQUISITE/UPDATE */
        char            *r_dname;       /* owner of the RR */
        uint16_t        r_class;        /* class number */
        uint16_t        r_type;         /* type number */
        uint32_t        r_ttl;          /* time to live */
        uchar_t         *r_data;        /* rdata fields as text string */
        uint16_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 */
        uint16_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,         /* 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 (deprecated) */
        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 (RFC 3123) */
        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_tlsa = 52,         /* TLSA (RFC 6698) */
        ns_t_smimea = 53,       /* S/MIME cert association (RFC 8162) */
        ns_t_hip = 55,          /* Host Identity Protocol */
        ns_t_cds = 59,          /* Child DS (RFC 7344) */
        ns_t_cdnskey = 60,      /* DNSKEY(s) the Child wants reflected in DS */
        ns_t_openpgpkey = 61,   /* OpenPGP Key (RFC 7929) */
        ns_t_csync = 62,        /* Child-To-Parent Synchronization (RFC 7477) */
        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_caa = 257,         /* Certification Authority Restriction */
        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, 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 uchar_t *t_cp = (const uchar_t *)(cp); \
        (s) = ((uint16_t)t_cp[0] << 8) \
            | ((uint16_t)t_cp[1]) \
        ; \
        (cp) += NS_INT16SZ; \
} while (0)

#define NS_GET32(l, cp) do { \
        register const uchar_t *t_cp = (const uchar_t *)(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 (0)

#define NS_PUT16(s, cp) do { \
        register uint16_t t_s = (uint16_t)(s); \
        register uchar_t *t_cp = (uchar_t *)(cp); \
        *t_cp++ = t_s >> 8; \
        *t_cp   = t_s; \
        (cp) += NS_INT16SZ; \
} while (0)

#define NS_PUT32(l, cp) do { \
        register uint32_t t_l = (uint32_t)(l); \
        register uchar_t *t_cp = (uchar_t *)(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.
 */
#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
#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_pton2           __ns_name_pton2
#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_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
#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
#define ns_newmsg_init          __ns_newmsg_init
#define ns_newmsg_copy          __ns_newmsg_copy
#define ns_newmsg_id            __ns_newmsg_id
#define ns_newmsg_flag          __ns_newmsg_flag
#define ns_newmsg_q             __ns_newmsg_q
#define ns_newmsg_rr            __ns_newmsg_rr
#define ns_newmsg_done          __ns_newmsg_done
#define ns_rdata_unpack         __ns_rdata_unpack
#define ns_rdata_equal          __ns_rdata_equal
#define ns_rdata_refers         __ns_rdata_refers

int             ns_msg_getflag(ns_msg, int);
uint_t          ns_get16(const uchar_t *);
ulong_t         ns_get32(const uchar_t *);
void            ns_put16(uint_t, uchar_t *);
void            ns_put32(ulong_t, uchar_t *);
int             ns_initparse(const uchar_t *, int, ns_msg *);
int             ns_skiprr(const uchar_t *, const uchar_t *, 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 uchar_t *, size_t, const char *,
    ns_class, ns_type, ulong_t, const uchar_t *,
    size_t, const char *, const char *,
    char *, size_t);
int             ns_format_ttl(ulong_t, char *, size_t);
int             ns_parse_ttl(const char *, ulong_t *);
uint32_t        ns_datetosecs(const char *cp, int *errp);
int             ns_name_ntol(const uchar_t *, uchar_t *, size_t);
int             ns_name_ntop(const uchar_t *, char *, size_t);
int             ns_name_pton(const char *, uchar_t *, size_t);
int             ns_name_pton2(const char *, uchar_t *, size_t, size_t *);
int             ns_name_unpack(const uchar_t *, const uchar_t *,
                                    const uchar_t *, uchar_t *, size_t);
int             ns_name_pack(const uchar_t *, uchar_t *, int,
    const uchar_t **, const uchar_t **);
int             ns_name_uncompress(const uchar_t *, const uchar_t *,
                                        const uchar_t *, char *, size_t);
int             ns_name_compress(const char *, uchar_t *, size_t,
                        const uchar_t **, const uchar_t **);
int             ns_name_skip(const uchar_t **, const uchar_t *);
void    ns_name_rollback(const uchar_t *, const uchar_t **,
                        const uchar_t **);
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);
int             ns_sign(uchar_t *, int *, int, int, void *,
                        const uchar_t *, int, uchar_t *, int *, time_t);
int             ns_sign2(uchar_t *, int *, int, int, void *,
                        const uchar_t *, int, uchar_t *, int *, time_t,
                        uchar_t **, uchar_t **);
int             ns_sign_tcp(uchar_t *, int *, int, int,
                        ns_tcp_tsig_state *, int);
int             ns_sign_tcp2(uchar_t *, int *, int, int,
                        ns_tcp_tsig_state *, int,
                        uchar_t **, uchar_t **);
int             ns_sign_tcp_init(void *, const uchar_t *, int,
                                        ns_tcp_tsig_state *);
uchar_t         *ns_find_tsig(uchar_t *, uchar_t *);
int             ns_verify(uchar_t *, int *, void *,
                        const uchar_t *, int, uchar_t *, int *,
                        time_t *, int);
int             ns_verify_tcp(uchar_t *, int *, ns_tcp_tsig_state *, int);
int             ns_verify_tcp_init(void *, const uchar_t *, 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 *);
int             ns_newmsg_init(uchar_t *buffer, size_t bufsiz, ns_newmsg *);
int             ns_newmsg_copy(ns_newmsg *, ns_msg *);
void            ns_newmsg_id(ns_newmsg *handle, uint16_t id);
void            ns_newmsg_flag(ns_newmsg *handle, ns_flag flag, uint_t value);
int             ns_newmsg_q(ns_newmsg *handle, ns_nname_ct qname,
                            ns_type qtype, ns_class qclass);
int             ns_newmsg_rr(ns_newmsg *handle, ns_sect sect,
                            ns_nname_ct name, ns_type type,
                            ns_class rr_class, uint32_t ttl,
                            uint16_t rdlen, const uchar_t *rdata);
size_t          ns_newmsg_done(ns_newmsg *handle);
ssize_t         ns_rdata_unpack(const uchar_t *, const uchar_t *, ns_type,
                                const uchar_t *, size_t, uchar_t *, size_t);
int             ns_rdata_equal(ns_type, const uchar_t *, size_t,
                                const uchar_t *, size_t);
int             ns_rdata_refers(ns_type,
                                const uchar_t *, size_t,
                                const uchar_t *);

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

#ifdef  __cplusplus
}
#endif

#endif  /* !_ARPA_NAMESER_H */