/usr/include/ircd-hybrid-8/irc_res.h is in hybrid-dev 1:8.1.13.dfsg.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* include/irc_res.h for referencing functions in src/irc_res.c
*
* $Id: irc_res.h 1180 2011-08-16 08:00:56Z michael $
*/
#ifndef INCLUDED_irc_res_h
#define INCLUDED_irc_res_h
#include "config.h"
struct Client; /* XXX */
/* 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 *);
extern void init_resolver(void);
extern void restart_resolver(void);
extern void delete_resolver_queries(const void *);
extern void report_dns_servers(struct Client *);
extern void gethost_byname_type(dns_callback_fnc , void *, const char *, int);
extern void gethost_byname(dns_callback_fnc, void *, const char *);
extern void gethost_byaddr(dns_callback_fnc, void *, const struct irc_ssaddr *);
#endif
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