trunk/include/res.h

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 1997-2014 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 $Id$
 */

#ifndef INCLUDED_irc_res_h
#define INCLUDED_irc_res_h

#include "config.h"

struct Client; /* XXX */


/*
 * 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 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_byaddr(dns_callback_fnc, void *, const struct irc_ssaddr *);
#endif
Revision:	4565
Committed:	Sun Aug 24 10:27:40 2014 UTC (11 years ago) by michael
Content type:	text/x-chdr
File size:	4149 byte(s)
Log Message:	- Update GPL 2 license headers
#	User	Rev	Content
1	adx	30	/*
2	michael	2935	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	adx	30	*
4	michael	2935	* Copyright (c) 1997-2014 ircd-hybrid development team
5			*
6			* This program is free software; you can redistribute it and/or modify
7			* it under the terms of the GNU General Public License as published by
8			* the Free Software Foundation; either version 2 of the License, or
9			* (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18	michael	4565	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
19	michael	2935	* USA
20	adx	30	*/
21
22	michael	3322	/*! \file res.h
23	michael	2935	* \brief ircd resolver functions
24			* \version $Id$
25			*/
26
27	adx	30	#ifndef INCLUDED_irc_res_h
28			#define INCLUDED_irc_res_h
29
30	michael	912	#include "config.h"
31	adx	30
32	michael	1011	struct Client; /* XXX */
33
34	michael	4408
35	michael	4444	/*
36			* From RFC 1035:
37			*
38			* Domain names in messages are expressed in terms of a sequence of labels.
39			* Each label is represented as a one octet length field followed by that
40			* number of octets. Since every domain name ends with the null label of
41			* the root, a domain name is terminated by a length byte of zero. The
42			* high order two bits of every length octet must be zero, and the
43			* remaining six bits of the length field limit the label to 63 octets or
44			* less.
45			*
46			* To simplify implementations, the total length of a domain name (i.e.,
47			* label octets and label length octets) is restricted to 255 octets or
48			* less.
49			*/
50	michael	4408	#define RFC1035_MAX_DOMAIN_LENGTH 255
51	michael	4444
52
53	adx	30	/* Here we define some values lifted from nameser.h */
54			#define NS_NOTIFY_OP 4
55			#define NS_INT16SZ 2
56			#define NS_IN6ADDRSZ 16
57	michael	2935	#define NS_INADDRSZ 4
58	adx	30	#define NS_INT32SZ 4
59			#define NS_CMPRSFLGS 0xc0
60			#define NS_MAXCDNAME 255
61			#define QUERY 0
62			#define IQUERY 1
63			#define NO_ERRORS 0
64			#define SERVFAIL 2
65	db	447	#define NXDOMAIN 3
66	adx	30	#define T_A 1
67			#define T_AAAA 28
68			#define T_PTR 12
69			#define T_CNAME 5
70			#define T_NULL 10
71			#define C_IN 1
72			#define QFIXEDSZ 4
73			#define RRFIXEDSZ 10
74			#define HFIXEDSZ 12
75
76
77			typedef struct
78			{
79	michael	2935	unsigned id :16; /* query identification number */
80	adx	30	#ifdef WORDS_BIGENDIAN
81	michael	2935	/* fields in third byte */
82			unsigned qr: 1; /* response flag */
83			unsigned opcode: 4; /* purpose of message */
84			unsigned aa: 1; /* authoritive answer */
85			unsigned tc: 1; /* truncated message */
86			unsigned rd: 1; /* recursion desired */
87
88			/* fields in fourth byte */
89			unsigned ra: 1; /* recursion available */
90			unsigned unused :1; /* unused bits (MBZ as of 4.9.3a3) */
91			unsigned ad: 1; /* authentic data from named */
92			unsigned cd: 1; /* checking disabled by resolver */
93			unsigned rcode :4; /* response code */
94	adx	30	#else
95	michael	2935	/* fields in third byte */
96			unsigned rd :1; /* recursion desired */
97			unsigned tc :1; /* truncated message */
98			unsigned aa :1; /* authoritive answer */
99			unsigned opcode :4; /* purpose of message */
100			unsigned qr :1; /* response flag */
101
102			/* fields in fourth byte */
103			unsigned rcode :4; /* response code */
104			unsigned cd: 1; /* checking disabled by resolver */
105			unsigned ad: 1; /* authentic data from named */
106			unsigned unused :1; /* unused bits (MBZ as of 4.9.3a3) */
107			unsigned ra :1; /* recursion available */
108	adx	30	#endif
109	michael	2935	/* remaining bytes */
110			unsigned qdcount :16; /* number of question entries */
111			unsigned ancount :16; /* number of answer entries */
112			unsigned nscount :16; /* number of authority entries */
113			unsigned arcount :16; /* number of resource entries */
114	adx	30	} HEADER;
115
116	michael	4408	typedef void (dns_callback_fnc)(void , const struct irc_ssaddr , const char , size_t);
117	michael	992
118	adx	30	extern void init_resolver(void);
119			extern void restart_resolver(void);
120	michael	992	extern void delete_resolver_queries(const void *);
121	adx	30	extern void report_dns_servers(struct Client *);
122	michael	992	extern void gethost_byname_type(dns_callback_fnc , void , const char , int);
123			extern void gethost_byaddr(dns_callback_fnc, void , const struct irc_ssaddr );
124	adx	30	#endif