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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.

 */

/*

 * Copyright (c) 1996 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS

 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE

 * CONSORTIUM 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.

 */

/*

 *      From: Id: nameser.h,v 8.16 1998/02/06 00:35:58 halley Exp

 *      $Id: nameser.h,v 1.2 2001-09-27 12:01:48 chris Exp $

 */

#ifndef _ARPA_NAMESER_H_

#define _ARPA_NAMESER_H_

#define BIND_4_COMPAT

#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 libnameser.a

 * is new enough to contain a certain feature.

 */

/* XXXRTH I made this bigger than __BIND in 4.9.5 T6B */

#define __NAMESER       19961001        /* New interface version stamp. */

/*

 * Define constants based on RFC 883, RFC 1034, RFC 1035

 */

#define NS_PACKETSZ     512     /* maximum packet size */

#define NS_MAXDNAME     1025    /* maximum domain name */

#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;

        u_int16_t       _id, _flags, _counts[ns_s_max];

        const u_char    *_sections[ns_s_max];

        ns_sect         _sect;

        int             _rrnum;

        const u_char    *_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) ((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];      /* XXX need to malloc */

        u_int16_t       type;

        u_int16_t       class;

        u_int32_t       ttl;

        u_int16_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)  ((rr).type + 0)

#define ns_rr_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

} 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;

/*

 * Currently defined type values for resources and queries.

 */

typedef enum __ns_type {

        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 */

        /* Query type values which do not appear in resource records. */

        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_max = 65536

} ns_type;

/*

 * Values for class field

 */

typedef enum __ns_class {

        ns_c_in = 1,            /* Internet. */

                                /* Class 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;

/*

 * 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_EXPERIMENTAL     0x2000  /* Security is *mandatory* if bit=0 */

#define NS_KEY_RESERVED3        0x1000  /* reserved - must be zero */

#define NS_KEY_RESERVED4        0x0800  /* reserved - must be zero */

#define NS_KEY_USERACCOUNT      0x0400  /* key is assoc. with a user acct */

#define NS_KEY_ENTITY           0x0200  /* key is assoc. with entity eg host */

#define NS_KEY_ZONEKEY          0x0100  /* key is zone key */

#define NS_KEY_IPSEC            0x0080  /* key is for IPSEC (host or user)*/

#define NS_KEY_EMAIL            0x0040  /* key is for email (MIME security) */

#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_RESERVED3 | \

                                  NS_KEY_RESERVED4 | \

                                  NS_KEY_RESERVED10 | \

                                  NS_KEY_RESERVED11 )

/* 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_EXPIRE_ONLY      253     /* No alg, no security */

#define NS_ALG_PRIVATE_OID      254     /* Key begins with OID giving alg */

/* Signatures */

#define NS_MD5RSA_MIN_BITS       512    /* Size of a mod or exp in bits */

#define NS_MD5RSA_MAX_BITS      2552

        /* 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)

/* 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)))

/*

 * Inline versions of get/put short/long.  Pointer is advanced.

 */

#define NS_GET16(s, cp) { \

        register u_char *t_cp = (u_char *)(cp); \

        (s) = ((u_int16_t)t_cp[0] << 8) \

            | ((u_int16_t)t_cp[1]) \

            ; \

        (cp) += NS_INT16SZ; \

}

#define NS_GET32(l, cp) { \

        register u_char *t_cp = (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; \

}

#define NS_PUT16(s, cp) { \

        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; \

}

#define NS_PUT32(l, cp) { \

        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; \

}

/*

 * ANSI C identifier hiding.

 */

#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_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_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

__BEGIN_DECLS

u_int           ns_get16 __P((const u_char *));

u_long          ns_get32 __P((const u_char *));

void            ns_put16 __P((u_int, u_char *));

void            ns_put32 __P((u_long, u_char *));

int             ns_initparse __P((const u_char *, int, ns_msg *));

int             ns_parserr __P((ns_msg *, ns_sect, int, ns_rr *));

int             ns_sprintrr __P((const ns_msg *, const ns_rr *,

                                 const char *, const char *, char *, size_t));

int             ns_sprintrrf __P((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 __P((u_long, char *, size_t));

int             ns_parse_ttl __P((const char *, u_long *));

int             ns_name_ntop __P((const u_char *, char *, size_t));

int             ns_name_pton __P((const char *, u_char *, size_t));

int             ns_name_unpack __P((const u_char *, const u_char *,

                                    const u_char *, u_char *, size_t));

int             ns_name_pack __P((const u_char *, u_char *, int,

                                  const u_char **, const u_char **));

int             ns_name_uncompress __P((const u_char *, const u_char *,

                                        const u_char *, char *, size_t));

int             ns_name_compress __P((const char *, u_char *, size_t,

                                      const u_char **, const u_char **));

int             ns_name_skip __P((const u_char **, const u_char *));

__END_DECLS

#ifdef BIND_4_COMPAT

#include <arpa/nameser_compat.h>

#endif

#endif /* !_ARPA_NAMESER_H_ */