| 1 | /* Modified for emx by hv 1994,1996
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| 2 | *
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| 3 | * Copyright (c) 1983, 1989 Regents of the University of California.
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| 4 | * All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | * 1. Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * 2. Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * 3. All advertising materials mentioning features or use of this software
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| 15 | * must display the following acknowledgement:
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| 16 | * This product includes software developed by the University of
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| 17 | * California, Berkeley and its contributors.
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| 18 | * 4. Neither the name of the University nor the names of its contributors
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| 19 | * may be used to endorse or promote products derived from this software
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| 20 | * without specific prior written permission.
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| 21 | *
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| 22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 32 | * SUCH DAMAGE.
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| 33 | *
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| 34 | * from: @(#)nameser.h 5.25 (Berkeley) 4/3/91
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| 35 | * $Id: nameser.h,v 1.4 1993/10/27 00:10:40 mycroft Exp $
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| 36 | */
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| 37 |
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| 38 | #ifndef _NAMESER_H_
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| 39 | #define _NAMESER_H_
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| 40 |
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| 41 | #if defined (__cplusplus)
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| 42 | extern "C" {
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| 43 | #endif
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| 44 |
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| 45 | #include <sys/param.h> /* htons() etc. */
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| 46 | #include <machine/endian.h> /* BYTE ORDER etc. */
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| 47 |
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| 48 | /*
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| 49 | * Define constants based on rfc883
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| 50 | */
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| 51 | #define PACKETSZ 512 /* maximum packet size */
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| 52 | #define MAXDNAME 256 /* maximum domain name */
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| 53 | #define MAXCDNAME 255 /* maximum compressed domain name */
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| 54 | #define MAXLABEL 63 /* maximum length of domain label */
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| 55 | /* Number of bytes of fixed size data in query structure */
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| 56 | #define QFIXEDSZ 4
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| 57 | /* number of bytes of fixed size data in resource record */
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| 58 | #define RRFIXEDSZ 10
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| 59 |
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| 60 | /*
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| 61 | * Internet nameserver port number
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| 62 | */
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| 63 | #define NAMESERVER_PORT 53
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| 64 |
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| 65 | /*
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| 66 | * Currently defined opcodes
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| 67 | */
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| 68 | #define QUERY 0x0 /* standard query */
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| 69 | #define IQUERY 0x1 /* inverse query */
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| 70 | #define STATUS 0x2 /* nameserver status query */
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| 71 | /*#define xxx 0x3 0x3 reserved */
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| 72 | /* non standard */
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| 73 | /* IBM has changed these codes in TCP/IP for OS/2 */
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| 74 | #define UPDATEA 100 /* add resource record */
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| 75 | #define UPDATED 101 /* delete a specific resource record */
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| 76 | #define UPDATEM 102 /* modify a specific resource record */
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| 77 | #define ZONEINIT 103 /* initial zone transfer */
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| 78 | #define ZONEREF 104 /* incremental zone referesh */
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| 79 |
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| 80 | /*
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| 81 | * Currently defined response codes
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| 82 | */
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| 83 | #define NOERROR 0 /* no error */
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| 84 | #define FORMERR 1 /* format error */
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| 85 | #define SERVFAIL 2 /* server failure */
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| 86 | #define NXDOMAIN 3 /* non existent domain */
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| 87 | #define NOTIMP 4 /* not implemented */
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| 88 | #define REFUSED 5 /* query refused */
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| 89 | /* non standard */
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| 90 | #define NOCHANGE 100 /* update failed to change db */
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| 91 |
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| 92 | /*
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| 93 | * Type values for resources and queries
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| 94 | */
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| 95 | #define T_A 1 /* host address */
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| 96 | #define T_NS 2 /* authoritative server */
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| 97 | #define T_MD 3 /* mail destination */
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| 98 | #define T_MF 4 /* mail forwarder */
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| 99 | #define T_CNAME 5 /* connonical name */
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| 100 | #define T_SOA 6 /* start of authority zone */
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| 101 | #define T_MB 7 /* mailbox domain name */
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| 102 | #define T_MG 8 /* mail group member */
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| 103 | #define T_MR 9 /* mail rename name */
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| 104 | #define T_NULL 10 /* null resource record */
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| 105 | #define T_WKS 11 /* well known service */
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| 106 | #define T_PTR 12 /* domain name pointer */
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| 107 | #define T_HINFO 13 /* host information */
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| 108 | #define T_MINFO 14 /* mailbox information */
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| 109 | #define T_MX 15 /* mail routing information */
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| 110 | #define T_TXT 16 /* text strings */
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| 111 | /* non standard */
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| 112 | #define T_UINFO 100 /* user (finger) information */
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| 113 | #define T_UID 101 /* user ID */
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| 114 | #define T_GID 102 /* group ID */
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| 115 | #define T_UNSPEC 103 /* Unspecified format (binary data) */
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| 116 | /* Query type values which do not appear in resource records */
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| 117 | #define T_AXFR 252 /* transfer zone of authority */
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| 118 | #define T_MAILB 253 /* transfer mailbox records */
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| 119 | #define T_MAILA 254 /* transfer mail agent records */
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| 120 | #define T_ANY 255 /* wildcard match */
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| 121 |
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| 122 | /*
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| 123 | * Values for class field
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| 124 | */
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| 125 | #define C_IN 1 /* the arpa internet */
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| 126 | #define C_CHAOS 3 /* for chaos net at MIT */
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| 127 | #define C_HS 4 /* for Hesiod name server at MIT */
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| 128 | /* Query class values which do not appear in resource records */
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| 129 | #define C_ANY 255 /* wildcard match */
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| 130 |
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| 131 | /*
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| 132 | * Status return codes for T_UNSPEC conversion routines
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| 133 | */
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| 134 | #define CONV_SUCCESS 0
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| 135 | #define CONV_OVERFLOW -1
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| 136 | #define CONV_BADFMT -2
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| 137 | #define CONV_BADCKSUM -3
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| 138 | #define CONV_BADBUFLEN -4
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| 139 |
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| 140 | /*
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| 141 | * Structure for query header, the order of the fields is machine and
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| 142 | * compiler dependent, in our case, the bits within a byte are assignd
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| 143 | * least significant first, while the order of transmition is most
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| 144 | * significant first. This requires a somewhat confusing rearrangement.
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| 145 | */
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| 146 | typedef struct {
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| 147 | u_short id; /* query identification number */
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| 148 | #if BYTE_ORDER == BIG_ENDIAN
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| 149 | /* fields in third byte */
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| 150 | u_char qr:1; /* response flag */
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| 151 | u_char opcode:4; /* purpose of message */
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| 152 | u_char aa:1; /* authoritive answer */
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| 153 | u_char tc:1; /* truncated message */
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| 154 | u_char rd:1; /* recursion desired */
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| 155 | /* fields in fourth byte */
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| 156 | u_char ra:1; /* recursion available */
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| 157 | u_char pr:1; /* primary server required (non standard) */
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| 158 | u_char unused:2; /* unused bits */
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| 159 | u_char rcode:4; /* response code */
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| 160 | #endif
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| 161 | #if BYTE_ORDER == LITTLE_ENDIAN || BYTE_ORDER == PDP_ENDIAN
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| 162 | /* fields in third byte */
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| 163 | u_char rd:1; /* recursion desired */
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| 164 | u_char tc:1; /* truncated message */
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| 165 | u_char aa:1; /* authoritive answer */
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| 166 | u_char opcode:4; /* purpose of message */
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| 167 | u_char qr:1; /* response flag */
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| 168 | /* fields in fourth byte */
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| 169 | u_char rcode:4; /* response code */
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| 170 | u_char unused:2; /* unused bits */
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| 171 | u_char pr:1; /* primary server required (non standard) */
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| 172 | u_char ra:1; /* recursion available */
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| 173 | #endif
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| 174 | /* remaining bytes */
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| 175 | u_short qdcount; /* number of question entries */
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| 176 | u_short ancount; /* number of answer entries */
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| 177 | u_short nscount; /* number of authority entries */
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| 178 | u_short arcount; /* number of resource entries */
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| 179 | } HEADER;
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| 180 |
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| 181 | /*
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| 182 | * Defines for handling compressed domain names
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| 183 | */
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| 184 | #define INDIR_MASK 0xc0
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| 185 |
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| 186 | /*
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| 187 | * Structure for passing resource records around.
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| 188 | */
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| 189 | #pragma pack(4)
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| 190 | struct rrec {
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| 191 | short r_zone; /* zone number */
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| 192 | short r_class; /* class number */
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| 193 | short r_type; /* type number */
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| 194 | u_long r_ttl; /* time to live */
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| 195 | int r_size; /* size of data area */
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| 196 | char *r_data; /* pointer to data */
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| 197 | };
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| 198 | #pragma pack()
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| 199 |
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| 200 | /*
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| 201 | * Inline versions of get/put short/long.
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| 202 | * Pointer is advanced; we assume that both arguments
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| 203 | * are lvalues and will already be in registers.
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| 204 | * cp MUST be u_char *.
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| 205 | */
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| 206 | #define GETSHORT(s, cp) { \
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| 207 | (s) = *(cp)++ << 8; \
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| 208 | (s) |= *(cp)++; \
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| 209 | }
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| 210 |
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| 211 | #define GETLONG(l, cp) { \
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| 212 | (l) = *(cp)++ << 8; \
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| 213 | (l) |= *(cp)++; (l) <<= 8; \
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| 214 | (l) |= *(cp)++; (l) <<= 8; \
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| 215 | (l) |= *(cp)++; \
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| 216 | }
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| 217 |
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| 218 |
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| 219 | #define PUTSHORT(s, cp) { \
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| 220 | *(cp)++ = (s) >> 8; \
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| 221 | *(cp)++ = (s); \
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| 222 | }
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| 223 |
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| 224 | /*
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| 225 | * Warning: PUTLONG destroys its first argument.
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| 226 | */
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| 227 | #define PUTLONG(l, cp) { \
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| 228 | (cp)[3] = l; \
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| 229 | (cp)[2] = (l >>= 8); \
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| 230 | (cp)[1] = (l >>= 8); \
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| 231 | (cp)[0] = l >> 8; \
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| 232 | (cp) += sizeof(u_long); \
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| 233 | }
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| 234 |
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| 235 | /* function prototypes */
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| 236 | u_short _getshort(u_char*);
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| 237 | u_long _getlong(u_char*);
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| 238 | void putshort(u_short, u_char *);
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| 239 | void putlong(u_long, u_char *);
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| 240 | int dn_expand(__const__ u_char*, __const__ u_char*, __const__ u_char*,
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| 241 | u_char*, int);
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| 242 | int dn_comp(__const__ u_char*, u_char*, int, u_char**, u_char**);
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| 243 | int dn_find(u_char*, u_char*, u_char**, u_char**);
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| 244 | int dn_skipname(__const__ u_char*, __const__ u_char*);
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| 245 | int res_init(void);
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| 246 | int res_mkquery(int, __const__ char*, int, int, __const__ char*,
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| 247 | int, __const__ struct rrec*, char*, int);
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| 248 | int res_send(__const__ char*, int, char*, int);
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| 249 | int res_query(char*, int, int, u_char*, int);
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| 250 | int res_search(char*, int, int, u_char*, int);
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| 251 | int res_querydomain(char*, char*, int, int, u_char*, int);
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| 252 |
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| 253 | #if defined (__cplusplus)
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| 254 | }
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| 255 | #endif
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| 256 |
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| 257 | #endif /* !_NAMESER_H_ */
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