ircd-hybrid-7.2/include/irc_res.h

/*
 * include/irc_res.h for referencing functions in src/irc_res.c
 *
 * $Id$
 */

#ifndef INCLUDED_irc_res_h
#define INCLUDED_irc_res_h

#include "listener.h"
#include "setup.h"

/* 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

struct DNSReply
{
  char *h_name;
  struct irc_ssaddr addr;
};

struct DNSQuery
{
#ifdef _WIN32
  dlink_node node;
  HANDLE handle;
  char reply[MAXGETHOSTSTRUCT];
#endif
  void *ptr; /* pointer used by callback to identify request */
  void (*callback)(void* vptr, struct DNSReply *reply); /* callback to call */
};

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;

extern void init_resolver(void);
extern void restart_resolver(void);
extern void delete_resolver_queries(const struct DNSQuery *);
extern void report_dns_servers(struct Client *);
extern void gethost_byname_type(const char *, struct DNSQuery *, int);
extern void gethost_byname(const char *, struct DNSQuery *);
extern void gethost_byaddr(const struct irc_ssaddr *, struct DNSQuery *);
extern void add_local_domain(char *, size_t);

#endif
Revision:	447
Committed:	Sun Feb 12 02:59:16 2006 UTC (20 years, 6 months ago) by db
Content type:	text/x-chdr
File size:	2817 byte(s)
Log Message:	- reported by Jon, resolver was not checking for NXDOMAIN as well as SERVFAIL this caused odd DNS reports and took longer to connect. Tested by Jon (ThaPrince). (backported from head)
#	User	Rev	Content
1	adx	30	/*
2			* include/irc_res.h for referencing functions in src/irc_res.c
3			*
4	knight	31	* $Id$
5	adx	30	*/
6
7			#ifndef INCLUDED_irc_res_h
8			#define INCLUDED_irc_res_h
9
10			#include "listener.h"
11			#include "setup.h"
12
13			/* Here we define some values lifted from nameser.h */
14			#define NS_NOTIFY_OP 4
15			#define NS_INT16SZ 2
16			#define NS_IN6ADDRSZ 16
17			#define NS_INADDRSZ 4
18			#define NS_INT32SZ 4
19			#define NS_CMPRSFLGS 0xc0
20			#define NS_MAXCDNAME 255
21			#define QUERY 0
22			#define IQUERY 1
23			#define NO_ERRORS 0
24			#define SERVFAIL 2
25	db	447	#define NXDOMAIN 3
26	adx	30	#define T_A 1
27			#define T_AAAA 28
28			#define T_PTR 12
29			#define T_CNAME 5
30			#define T_NULL 10
31			#define C_IN 1
32			#define QFIXEDSZ 4
33			#define RRFIXEDSZ 10
34			#define HFIXEDSZ 12
35
36			struct DNSReply
37			{
38			char *h_name;
39			struct irc_ssaddr addr;
40			};
41
42			struct DNSQuery
43			{
44			#ifdef _WIN32
45			dlink_node node;
46			HANDLE handle;
47			char reply[MAXGETHOSTSTRUCT];
48			#endif
49			void ptr; / pointer used by callback to identify request */
50			void (callback)(void vptr, struct DNSReply reply); / callback to call */
51			};
52
53			typedef struct
54			{
55			unsigned id :16; /* query identification number */
56			#ifdef WORDS_BIGENDIAN
57			/* fields in third byte */
58			unsigned qr: 1; /* response flag */
59			unsigned opcode: 4; /* purpose of message */
60			unsigned aa: 1; /* authoritive answer */
61			unsigned tc: 1; /* truncated message */
62			unsigned rd: 1; /* recursion desired */
63			/* fields in fourth byte */
64			unsigned ra: 1; /* recursion available */
65			unsigned unused :1; /* unused bits (MBZ as of 4.9.3a3) */
66			unsigned ad: 1; /* authentic data from named */
67			unsigned cd: 1; /* checking disabled by resolver */
68			unsigned rcode :4; /* response code */
69			#else
70			/* fields in third byte */
71			unsigned rd :1; /* recursion desired */
72			unsigned tc :1; /* truncated message */
73			unsigned aa :1; /* authoritive answer */
74			unsigned opcode :4; /* purpose of message */
75			unsigned qr :1; /* response flag */
76			/* fields in fourth byte */
77			unsigned rcode :4; /* response code */
78			unsigned cd: 1; /* checking disabled by resolver */
79			unsigned ad: 1; /* authentic data from named */
80			unsigned unused :1; /* unused bits (MBZ as of 4.9.3a3) */
81			unsigned ra :1; /* recursion available */
82			#endif
83			/* remaining bytes */
84			unsigned qdcount :16; /* number of question entries */
85			unsigned ancount :16; /* number of answer entries */
86			unsigned nscount :16; /* number of authority entries */
87			unsigned arcount :16; /* number of resource entries */
88			} HEADER;
89
90			extern void init_resolver(void);
91			extern void restart_resolver(void);
92			extern void delete_resolver_queries(const struct DNSQuery *);
93			extern void report_dns_servers(struct Client *);
94			extern void gethost_byname_type(const char , struct DNSQuery , int);
95			extern void gethost_byname(const char , struct DNSQuery );
96			extern void gethost_byaddr(const struct irc_ssaddr , struct DNSQuery );
97			extern void add_local_domain(char *, size_t);
98
99			#endif