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/*
PowerDNS Versatile Database Driven Nameserver
Copyright (C) 2002 PowerDNS.COM BV
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2
as published by the Free Software Foundation
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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
// $Id: dns.hh 1185 2008-06-08 08:41:01Z ahu $
/* (C) 2002 POWERDNS.COM BV */
#ifndef DNS_HH
#define DNS_HH
#include "utility.hh"
#include "qtype.hh"
#include <time.h>
#include <sys/types.h>
class DNSBackend;
struct SOAData
{
string qname;
string nameserver;
string hostmaster;
uint32_t ttl;
uint32_t serial;
uint32_t refresh;
uint32_t retry;
uint32_t expire;
uint32_t default_ttl;
int domain_id;
DNSBackend *db;
};
class RCode
{
public:
enum rcodes_ { NoError=0, FormErr=1, ServFail=2, NXDomain=3, NotImp=4, Refused=5 };
};
class Opcode
{
public:
enum { Query=0, IQuery=1, Status=2, Notify=4, Update=5 };
};
//! This class represents a resource record
class DNSResourceRecord
{
public:
DNSResourceRecord() : qclass(1), priority(0), d_place(ANSWER) {};
~DNSResourceRecord(){};
string serialize() const;
int unSerialize(const string &str);
// data
QType qtype; //!< qtype of this record, ie A, CNAME, MX etc
uint16_t qclass; //!< class of this record
string qname; //!< the name of this record, for example: www.powerdns.com
string content; //!< what this record points to. Example: 10.1.2.3
uint16_t priority; //!< For qtype's that support a priority or preference. Currently only MX
uint32_t ttl; //!< Time To Live of this record
int domain_id; //!< If a backend implements this, the domain_id of the zone this record is in
time_t last_modified; //!< For autocalculating SOA serial numbers - the backend needs to fill this in
enum Place {QUESTION=0, ANSWER=1, AUTHORITY=2, ADDITIONAL=3}; //!< Type describing the positioning of a DNSResourceRecord within, say, a DNSPacket
Place d_place; //!< This specifies where a record goes within the packet
bool operator<(const DNSResourceRecord &b) const
{
if(qname < b.qname)
return true;
if(qname == b.qname)
return(content < b.content);
return false;
}
private:
string escape(const string &str) const;
};
#ifdef _MSC_VER
# pragma pack ( push )
# pragma pack ( 1 )
# define GCCPACKATTRIBUTE
#else
# define GCCPACKATTRIBUTE __attribute__((packed))
#endif
struct dnsrecordheader
{
uint16_t d_type;
uint16_t d_class;
uint32_t d_ttl;
uint16_t d_clen;
} GCCPACKATTRIBUTE;
struct EDNS0Record
{
uint8_t extRCode, version;
uint16_t Z;
} GCCPACKATTRIBUTE;
#ifdef _MSC_VER
#pragma pack (pop)
#endif
enum {
ns_t_invalid = 0, /* Cookie. */
ns_t_a = 1, /* Host address. */
ns_t_ns = 2, /* Authoritative server. */
ns_t_md = 3, /* Mail destination. */
ns_t_mf = 4, /* Mail forwarder. */
ns_t_cname = 5, /* Canonical name. */
ns_t_soa = 6, /* Start of authority zone. */
ns_t_mb = 7, /* Mailbox domain name. */
ns_t_mg = 8, /* Mail group member. */
ns_t_mr = 9, /* Mail rename name. */
ns_t_null = 10, /* Null resource record. */
ns_t_wks = 11, /* Well known service. */
ns_t_ptr = 12, /* Domain name pointer. */
ns_t_hinfo = 13, /* Host information. */
ns_t_minfo = 14, /* Mailbox information. */
ns_t_mx = 15, /* Mail routing information. */
ns_t_txt = 16, /* Text strings. */
ns_t_rp = 17, /* Responsible person. */
ns_t_afsdb = 18, /* AFS cell database. */
ns_t_x25 = 19, /* X_25 calling address. */
ns_t_isdn = 20, /* ISDN calling address. */
ns_t_rt = 21, /* Router. */
ns_t_nsap = 22, /* NSAP address. */
ns_t_nsap_ptr = 23, /* Reverse NSAP lookup (deprecated). */
ns_t_sig = 24, /* Security signature. */
ns_t_key = 25, /* Security key. */
ns_t_px = 26, /* X.400 mail mapping. */
ns_t_gpos = 27, /* Geographical position (withdrawn). */
ns_t_aaaa = 28, /* Ip6 Address. */
ns_t_loc = 29, /* Location Information. */
ns_t_nxt = 30, /* Next domain (security). */
ns_t_eid = 31, /* Endpoint identifier. */
ns_t_nimloc = 32, /* Nimrod Locator. */
ns_t_srv = 33, /* Server Selection. */
ns_t_atma = 34, /* ATM Address */
ns_t_naptr = 35, /* Naming Authority PoinTeR */
ns_t_kx = 36, /* Key Exchange */
ns_t_cert = 37, /* Certification record */
ns_t_a6 = 38, /* IPv6 address (deprecates AAAA) */
ns_t_dname = 39, /* Non-terminal DNAME (for IPv6) */
ns_t_sink = 40, /* Kitchen sink (experimentatl) */
ns_t_opt = 41, /* EDNS0 option (meta-RR) */
ns_t_tsig = 250, /* Transaction signature. */
ns_t_ixfr = 251, /* Incremental zone transfer. */
ns_t_axfr = 252, /* Transfer zone of authority. */
ns_t_mailb = 253, /* Transfer mailbox records. */
ns_t_maila = 254, /* Transfer mail agent records. */
ns_t_any = 255, /* Wildcard match. */
};
#ifdef WIN32
#define BYTE_ORDER 1
#define LITTLE_ENDIAN 1
#elif __FreeBSD__ || __APPLE__
#include <machine/endian.h>
#elif __linux__
# include <endian.h>
#else // with thanks to <arpa/nameser.h>
# define LITTLE_ENDIAN 1234 /* least-significant byte first (vax, pc) */
# define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */
# define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp) */
#if defined(vax) || defined(ns32000) || defined(sun386) || defined(i386) || \
defined(__i386) || defined(__ia64) || defined(__amd64) || \
defined(MIPSEL) || defined(_MIPSEL) || defined(BIT_ZERO_ON_RIGHT) || \
defined(__alpha__) || defined(__alpha) || \
(defined(__Lynx__) && defined(__x86__))
# define BYTE_ORDER LITTLE_ENDIAN
#endif
#if defined(sel) || defined(pyr) || defined(mc68000) || defined(sparc) || \
defined(__sparc) || \
defined(is68k) || defined(tahoe) || defined(ibm032) || defined(ibm370) || \
defined(MIPSEB) || defined(_MIPSEB) || defined(_IBMR2) || defined(DGUX) ||\
defined(apollo) || defined(__convex__) || defined(_CRAY) || \
defined(__hppa) || defined(__hp9000) || \
defined(__hp9000s300) || defined(__hp9000s700) || \
defined(__hp3000s900) || defined(MPE) || \
defined(BIT_ZERO_ON_LEFT) || defined(m68k) || \
(defined(__Lynx__) && \
(defined(__68k__) || defined(__sparc__) || defined(__powerpc__)))
# define BYTE_ORDER BIG_ENDIAN
#endif
#endif
struct dnsheader {
unsigned id :16; /* query identification number */
#if BYTE_ORDER == BIG_ENDIAN
/* 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 */
#endif
#if BYTE_ORDER == LITTLE_ENDIAN || BYTE_ORDER == PDP_ENDIAN
/* 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 */
};
#define L theL()
extern time_t s_starttime;
#endif
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