| 1 |
/* |
| 2 |
* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd) |
| 3 |
* |
| 4 |
* 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 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| 19 |
* USA |
| 20 |
*/ |
| 21 |
|
| 22 |
/*! \file irc_res.h |
| 23 |
* \brief ircd resolver functions |
| 24 |
* \version $Id$ |
| 25 |
*/ |
| 26 |
|
| 27 |
#ifndef INCLUDED_irc_res_h |
| 28 |
#define INCLUDED_irc_res_h |
| 29 |
|
| 30 |
#include "config.h" |
| 31 |
|
| 32 |
struct Client; /* XXX */ |
| 33 |
|
| 34 |
/* Here we define some values lifted from nameser.h */ |
| 35 |
#define NS_NOTIFY_OP 4 |
| 36 |
#define NS_INT16SZ 2 |
| 37 |
#define NS_IN6ADDRSZ 16 |
| 38 |
#define NS_INADDRSZ 4 |
| 39 |
#define NS_INT32SZ 4 |
| 40 |
#define NS_CMPRSFLGS 0xc0 |
| 41 |
#define NS_MAXCDNAME 255 |
| 42 |
#define QUERY 0 |
| 43 |
#define IQUERY 1 |
| 44 |
#define NO_ERRORS 0 |
| 45 |
#define SERVFAIL 2 |
| 46 |
#define NXDOMAIN 3 |
| 47 |
#define T_A 1 |
| 48 |
#define T_AAAA 28 |
| 49 |
#define T_PTR 12 |
| 50 |
#define T_CNAME 5 |
| 51 |
#define T_NULL 10 |
| 52 |
#define C_IN 1 |
| 53 |
#define QFIXEDSZ 4 |
| 54 |
#define RRFIXEDSZ 10 |
| 55 |
#define HFIXEDSZ 12 |
| 56 |
|
| 57 |
|
| 58 |
typedef struct |
| 59 |
{ |
| 60 |
unsigned id :16; /* query identification number */ |
| 61 |
#ifdef WORDS_BIGENDIAN |
| 62 |
/* fields in third byte */ |
| 63 |
unsigned qr: 1; /* response flag */ |
| 64 |
unsigned opcode: 4; /* purpose of message */ |
| 65 |
unsigned aa: 1; /* authoritive answer */ |
| 66 |
unsigned tc: 1; /* truncated message */ |
| 67 |
unsigned rd: 1; /* recursion desired */ |
| 68 |
|
| 69 |
/* fields in fourth byte */ |
| 70 |
unsigned ra: 1; /* recursion available */ |
| 71 |
unsigned unused :1; /* unused bits (MBZ as of 4.9.3a3) */ |
| 72 |
unsigned ad: 1; /* authentic data from named */ |
| 73 |
unsigned cd: 1; /* checking disabled by resolver */ |
| 74 |
unsigned rcode :4; /* response code */ |
| 75 |
#else |
| 76 |
/* fields in third byte */ |
| 77 |
unsigned rd :1; /* recursion desired */ |
| 78 |
unsigned tc :1; /* truncated message */ |
| 79 |
unsigned aa :1; /* authoritive answer */ |
| 80 |
unsigned opcode :4; /* purpose of message */ |
| 81 |
unsigned qr :1; /* response flag */ |
| 82 |
|
| 83 |
/* fields in fourth byte */ |
| 84 |
unsigned rcode :4; /* response code */ |
| 85 |
unsigned cd: 1; /* checking disabled by resolver */ |
| 86 |
unsigned ad: 1; /* authentic data from named */ |
| 87 |
unsigned unused :1; /* unused bits (MBZ as of 4.9.3a3) */ |
| 88 |
unsigned ra :1; /* recursion available */ |
| 89 |
#endif |
| 90 |
/* remaining bytes */ |
| 91 |
unsigned qdcount :16; /* number of question entries */ |
| 92 |
unsigned ancount :16; /* number of answer entries */ |
| 93 |
unsigned nscount :16; /* number of authority entries */ |
| 94 |
unsigned arcount :16; /* number of resource entries */ |
| 95 |
} HEADER; |
| 96 |
|
| 97 |
typedef void (*dns_callback_fnc)(void *, const struct irc_ssaddr *, const char *); |
| 98 |
|
| 99 |
extern void init_resolver(void); |
| 100 |
extern void restart_resolver(void); |
| 101 |
extern void delete_resolver_queries(const void *); |
| 102 |
extern void report_dns_servers(struct Client *); |
| 103 |
extern void gethost_byname_type(dns_callback_fnc , void *, const char *, int); |
| 104 |
extern void gethost_byname(dns_callback_fnc, void *, const char *); |
| 105 |
extern void gethost_byaddr(dns_callback_fnc, void *, const struct irc_ssaddr *); |
| 106 |
#endif |
