/usr/include/ircd-hybrid-8/res.h is in hybrid-dev 1:8.2.22+dfsg.1-1.
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* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
*
* Copyright (c) 1997-2017 ircd-hybrid development team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
* USA
*/
/*! \file res.h
* \brief ircd resolver functions
* \version $Id: res.h 7925 2016-12-31 13:57:24Z michael $
*/
#ifndef INCLUDED_res_h
#define INCLUDED_res_h
#include "config.h"
/*
* From RFC 1035:
*
* Domain names in messages are expressed in terms of a sequence of labels.
* Each label is represented as a one octet length field followed by that
* number of octets. Since every domain name ends with the null label of
* the root, a domain name is terminated by a length byte of zero. The
* high order two bits of every length octet must be zero, and the
* remaining six bits of the length field limit the label to 63 octets or
* less.
*
* To simplify implementations, the total length of a domain name (i.e.,
* label octets and label length octets) is restricted to 255 octets or
* less.
*/
#define RFC1035_MAX_DOMAIN_LENGTH 255
/* Here we define some values lifted from nameser.h */
#define NS_NOTIFY_OP 4
#define NS_INT16SZ 2
#define NS_IN6ADDRSZ 16
#define NS_INADDRSZ 4
#define NS_INT32SZ 4
#define NS_CMPRSFLGS 0xc0
#define NS_MAXCDNAME 255
#define QUERY 0
#define IQUERY 1
#define NO_ERRORS 0
#define SERVFAIL 2
#define NXDOMAIN 3
#define T_A 1
#define T_AAAA 28
#define T_PTR 12
#define T_CNAME 5
#define T_NULL 10
#define C_IN 1
#define QFIXEDSZ 4
#define RRFIXEDSZ 10
#define HFIXEDSZ 12
typedef struct
{
unsigned id :16; /* query identification number */
#ifdef WORDS_BIGENDIAN
/* fields in third byte */
unsigned qr: 1; /* response flag */
unsigned opcode: 4; /* purpose of message */
unsigned aa: 1; /* authoritive answer */
unsigned tc: 1; /* truncated message */
unsigned rd: 1; /* recursion desired */
/* fields in fourth byte */
unsigned ra: 1; /* recursion available */
unsigned unused :1; /* unused bits (MBZ as of 4.9.3a3) */
unsigned ad: 1; /* authentic data from named */
unsigned cd: 1; /* checking disabled by resolver */
unsigned rcode :4; /* response code */
#else
/* fields in third byte */
unsigned rd :1; /* recursion desired */
unsigned tc :1; /* truncated message */
unsigned aa :1; /* authoritive answer */
unsigned opcode :4; /* purpose of message */
unsigned qr :1; /* response flag */
/* fields in fourth byte */
unsigned rcode :4; /* response code */
unsigned cd: 1; /* checking disabled by resolver */
unsigned ad: 1; /* authentic data from named */
unsigned unused :1; /* unused bits (MBZ as of 4.9.3a3) */
unsigned ra :1; /* recursion available */
#endif
/* remaining bytes */
unsigned qdcount :16; /* number of question entries */
unsigned ancount :16; /* number of answer entries */
unsigned nscount :16; /* number of authority entries */
unsigned arcount :16; /* number of resource entries */
} HEADER;
typedef void (*dns_callback_fnc)(void *, const struct irc_ssaddr *, const char *, size_t);
extern void resolver_init(void);
extern void restart_resolver(void);
extern void delete_resolver_queries(const void *);
extern void gethost_byname_type(dns_callback_fnc , void *, const char *, int);
extern void gethost_byaddr(dns_callback_fnc, void *, const struct irc_ssaddr *);
#endif
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