[thirdparty/pdns.git] / pdns / dns.hh

/*
    PowerDNS Versatile Database Driven Nameserver
    Copyright (C) 2002 - 2011 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

    Additionally, the license of this program contains a special
    exception which allows to distribute the program in binary form when
    it is linked against OpenSSL.

    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
*/
// $Id$ 
/* (C) 2002 POWERDNS.COM BV */
#ifndef DNS_HH
#define DNS_HH
#include <boost/multi_index_container.hpp>
#include <boost/multi_index/ordered_index.hpp>
#include <boost/tuple/tuple_comparison.hpp>
#include <boost/multi_index/key_extractors.hpp>
#include <boost/multi_index/sequenced_index.hpp>
#include <boost/serialization/string.hpp>
#include <boost/serialization/version.hpp>


#include "utility.hh"
#include "qtype.hh"
#include <time.h>
#include <sys/types.h>
class DNSBackend;

struct SOAData
{
  SOAData() : db(0), scopeMask(0) {};

  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;
  uint8_t scopeMask;
};


class RCode
{
public:
  enum rcodes_ { NoError=0, FormErr=1, ServFail=2, NXDomain=3, NotImp=4, Refused=5, YXDomain=6, YXRRSet=7, NXRRSet=8, NotAuth=9, NotZone=10};
};

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), signttl(0), last_modified(0), d_place(ANSWER), auth(1), scopeMask(0) {};
  DNSResourceRecord(const struct DNSRecord&);
  ~DNSResourceRecord(){};

  void setContent(const string& content);
  string getZoneRepresentation();

  // 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 wildcardname;
  string content; //!< what this record points to. Example: 10.1.2.3
  uint16_t priority; //!< For qtypes that support a priority or preference (MX, SRV)
  uint32_t ttl; //!< Time To Live of this record
  uint32_t signttl; //!< If non-zero, use this TTL as original TTL in the RRSIG
  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 auth;
  uint8_t scopeMask;

  template<class Archive>
  void serialize(Archive & ar, const unsigned int version)
  {
    ar & qtype;
    ar & qclass;
    ar & qname;
    ar & wildcardname;
    ar & content;
    ar & priority;
    ar & ttl;
    ar & domain_id;
    ar & last_modified;
    ar & d_place;
    ar & auth;
  }

  bool operator==(const DNSResourceRecord& rhs);

  bool operator<(const DNSResourceRecord &b) const
  {
    if(qname < b.qname)
      return true;
    if(qname == b.qname)
      return(content < b.content);
    return false;
  }
};

#define GCCPACKATTRIBUTE __attribute__((packed))

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;

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 (experimental) */
        ns_t_opt = 41,          /* EDNS0 option (meta-RR) */
        ns_t_ds = 43,           /* Delegation signer */
        ns_t_ipseckey = 45,     /* IPSEC Key */
        ns_t_rrsig = 46,        /* Resoure Record signature */
        ns_t_nsec = 47,         /* Next Record */
        ns_t_dnskey = 48,       /* DNSKEY record */
        ns_t_nsec3 = 50,        /* Next Record v3 */
        ns_t_nsec3param = 51,   /* NSEC Parameters */
        ns_t_tlsa = 52,         /* TLSA */
        ns_t_eui48 = 108,       /* EUI-48 */
        ns_t_eui64 = 109,       /* EUI-64 */
        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. */
};

#if __FreeBSD__ || __APPLE__ || __OpenBSD__
#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;          /* authoritative 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;          /* authoritative 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;
std::string questionExpand(const char* packet, uint16_t len, uint16_t& type);
bool dnspacketLessThan(const std::string& a, const std::string& b);

/** helper function for both DNSPacket and addSOARecord() - converts a line into a struct, for easier parsing */
void fillSOAData(const string &content, SOAData &data);

/** for use by DNSPacket, converts a SOAData class to a ascii line again */
string serializeSOAData(const SOAData &data);
string &attodot(string &str);  //!< for when you need to insert an email address in the SOA
string strrcode(unsigned char rcode);
#endif
Commit	Line	Data
12c86877 BH	1	/*
12c86877 BH	2	PowerDNS Versatile Database Driven Nameserver
213cc78f	3	Copyright (C) 2002 - 2011 PowerDNS.COM BV
12c86877 BH	4
12c86877 BH	5	This program is free software; you can redistribute it and/or modify
22dc646a BH	6	it under the terms of the GNU General Public License version 2
22dc646a BH	7	as published by the Free Software Foundation
f782fe38 MH	8
	9	Additionally, the license of this program contains a special
	10	exception which allows to distribute the program in binary form when
	11	it is linked against OpenSSL.
12c86877 BH	12
	13	This program is distributed in the hope that it will be useful,
	14	but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	GNU General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with this program; if not, write to the Free Software
06bd9ccf	20	Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
12c86877	21	*/
092f210a	22	// $Id$
12c86877 BH	23	/* (C) 2002 POWERDNS.COM BV */
	24	#ifndef DNS_HH
	25	#define DNS_HH
5f8fcf64 BH	26	#include <boost/multi_index_container.hpp>
	27	#include <boost/multi_index/ordered_index.hpp>
	28	#include <boost/tuple/tuple_comparison.hpp>
	29	#include <boost/multi_index/key_extractors.hpp>
	30	#include <boost/multi_index/sequenced_index.hpp>
cb433f9c BH	31	#include <boost/serialization/string.hpp>
	32	#include <boost/serialization/version.hpp>
	33
	34
12c86877 BH	35	#include "utility.hh"
	36	#include "qtype.hh"
	37	#include <time.h>
	38	#include <sys/types.h>
	39	class DNSBackend;
	40
	41	struct SOAData
	42	{
aff67420	43	SOAData() : db(0), scopeMask(0) {};
998a2450	44
12c86877 BH	45	string qname;
	46	string nameserver;
	47	string hostmaster;
092f210a BH	48	uint32_t ttl;
	49	uint32_t serial;
	50	uint32_t refresh;
	51	uint32_t retry;
	52	uint32_t expire;
	53	uint32_t default_ttl;
12c86877 BH	54	int domain_id;
12c86877 BH	55	DNSBackend *db;
af7d3ea6	56	uint8_t scopeMask;
12c86877 BH	57	};
	58
	59
	60	class RCode
	61	{
	62	public:
751ccfff	63	enum rcodes_ { NoError=0, FormErr=1, ServFail=2, NXDomain=3, NotImp=4, Refused=5, YXDomain=6, YXRRSet=7, NXRRSet=8, NotAuth=9, NotZone=10};
12c86877 BH	64	};
	65
	66	class Opcode
	67	{
	68	public:
	69	enum { Query=0, IQuery=1, Status=2, Notify=4, Update=5 };
	70	};
	71
12c86877 BH	72	//! This class represents a resource record
	73	class DNSResourceRecord
	74	{
	75	public:
794c2f92	76	DNSResourceRecord() : qclass(1), priority(0), signttl(0), last_modified(0), d_place(ANSWER), auth(1), scopeMask(0) {};
f7a69a4c	77	DNSResourceRecord(const struct DNSRecord&);
12c86877 BH	78	~DNSResourceRecord(){};
12c86877 BH	79
f7a69a4c RA	80	void setContent(const string& content);
	81	string getZoneRepresentation();
	82
12c86877 BH	83	// data
	84
	85	QType qtype; //!< qtype of this record, ie A, CNAME, MX etc
a9af3782	86	uint16_t qclass; //!< class of this record
12c86877	87	string qname; //!< the name of this record, for example: www.powerdns.com
702b226d	88	string wildcardname;
12c86877	89	string content; //!< what this record points to. Example: 10.1.2.3
cb433f9c	90	uint16_t priority; //!< For qtypes that support a priority or preference (MX, SRV)
092f210a	91	uint32_t ttl; //!< Time To Live of this record
794c2f92	92	uint32_t signttl; //!< If non-zero, use this TTL as original TTL in the RRSIG
12c86877 BH	93	int domain_id; //!< If a backend implements this, the domain_id of the zone this record is in
	94	time_t last_modified; //!< For autocalculating SOA serial numbers - the backend needs to fill this in
	95	enum Place {QUESTION=0, ANSWER=1, AUTHORITY=2, ADDITIONAL=3}; //!< Type describing the positioning of a DNSResourceRecord within, say, a DNSPacket
	96	Place d_place; //!< This specifies where a record goes within the packet
	97
702b226d	98	bool auth;
af7d3ea6	99	uint8_t scopeMask;
702b226d	100
cb433f9c BH	101	template<class Archive>
	102	void serialize(Archive & ar, const unsigned int version)
	103	{
	104	ar & qtype;
	105	ar & qclass;
	106	ar & qname;
	107	ar & wildcardname;
	108	ar & content;
	109	ar & priority;
	110	ar & ttl;
	111	ar & domain_id;
	112	ar & last_modified;
	113	ar & d_place;
	114	ar & auth;
	115	}
914353ca	116
f7a69a4c	117	bool operator==(const DNSResourceRecord& rhs);
cb433f9c	118
728485ca BH	119	bool operator<(const DNSResourceRecord &b) const
728485ca BH	120	{
c536ca8d	121	if(qname < b.qname)
728485ca	122	return true;
c536ca8d BH	123	if(qname == b.qname)
c536ca8d BH	124	return(content < b.content);
728485ca BH	125	return false;
728485ca BH	126	}
12c86877 BH	127	};
12c86877 BH	128
76473b92 KM	129	#define GCCPACKATTRIBUTE __attribute__((packed))
76473b92 KM	130
5a57d2ea BH	131	struct dnsrecordheader
	132	{
	133	uint16_t d_type;
	134	uint16_t d_class;
	135	uint32_t d_ttl;
	136	uint16_t d_clen;
009f9f55 BH	137	} GCCPACKATTRIBUTE;
	138
	139	struct EDNS0Record
	140	{
4957a608 BH	141	uint8_t extRCode, version;
4957a608 BH	142	uint16_t Z;
009f9f55	143	} GCCPACKATTRIBUTE;
009f9f55	144
8b3cfcd3	145	enum {
5a57d2ea BH	146	ns_t_invalid = 0, /* Cookie. */
	147	ns_t_a = 1, /* Host address. */
	148	ns_t_ns = 2, /* Authoritative server. */
	149	ns_t_md = 3, /* Mail destination. */
	150	ns_t_mf = 4, /* Mail forwarder. */
	151	ns_t_cname = 5, /* Canonical name. */
	152	ns_t_soa = 6, /* Start of authority zone. */
	153	ns_t_mb = 7, /* Mailbox domain name. */
	154	ns_t_mg = 8, /* Mail group member. */
	155	ns_t_mr = 9, /* Mail rename name. */
	156	ns_t_null = 10, /* Null resource record. */
	157	ns_t_wks = 11, /* Well known service. */
	158	ns_t_ptr = 12, /* Domain name pointer. */
	159	ns_t_hinfo = 13, /* Host information. */
	160	ns_t_minfo = 14, /* Mailbox information. */
	161	ns_t_mx = 15, /* Mail routing information. */
	162	ns_t_txt = 16, /* Text strings. */
	163	ns_t_rp = 17, /* Responsible person. */
	164	ns_t_afsdb = 18, /* AFS cell database. */
	165	ns_t_x25 = 19, /* X_25 calling address. */
	166	ns_t_isdn = 20, /* ISDN calling address. */
8b3cfcd3	167	ns_t_rt = 21, /* Router. */
5a57d2ea BH	168	ns_t_nsap = 22, /* NSAP address. */
	169	ns_t_nsap_ptr = 23, /* Reverse NSAP lookup (deprecated). */
	170	ns_t_sig = 24, /* Security signature. */
	171	ns_t_key = 25, /* Security key. */
	172	ns_t_px = 26, /* X.400 mail mapping. */
	173	ns_t_gpos = 27, /* Geographical position (withdrawn). */
	174	ns_t_aaaa = 28, /* Ip6 Address. */
	175	ns_t_loc = 29, /* Location Information. */
	176	ns_t_nxt = 30, /* Next domain (security). */
	177	ns_t_eid = 31, /* Endpoint identifier. */
	178	ns_t_nimloc = 32, /* Nimrod Locator. */
	179	ns_t_srv = 33, /* Server Selection. */
	180	ns_t_atma = 34, /* ATM Address */
	181	ns_t_naptr = 35, /* Naming Authority PoinTeR */
	182	ns_t_kx = 36, /* Key Exchange */
	183	ns_t_cert = 37, /* Certification record */
	184	ns_t_a6 = 38, /* IPv6 address (deprecates AAAA) */
	185	ns_t_dname = 39, /* Non-terminal DNAME (for IPv6) */
abc1d928	186	ns_t_sink = 40, /* Kitchen sink (experimental) */
5a57d2ea	187	ns_t_opt = 41, /* EDNS0 option (meta-RR) */
59a11942	188	ns_t_ds = 43, /* Delegation signer */
7c56383a	189	ns_t_ipseckey = 45, /* IPSEC Key */
59a11942 PD	190	ns_t_rrsig = 46, /* Resoure Record signature */
	191	ns_t_nsec = 47, /* Next Record */
	192	ns_t_dnskey = 48, /* DNSKEY record */
	193	ns_t_nsec3 = 50, /* Next Record v3 */
	194	ns_t_nsec3param = 51, /* NSEC Parameters */
	195	ns_t_tlsa = 52, /* TLSA */
1708f778 AT	196	ns_t_eui48 = 108, /* EUI-48 */
1708f778 AT	197	ns_t_eui64 = 109, /* EUI-64 */
5a57d2ea BH	198	ns_t_tsig = 250, /* Transaction signature. */
	199	ns_t_ixfr = 251, /* Incremental zone transfer. */
	200	ns_t_axfr = 252, /* Transfer zone of authority. */
	201	ns_t_mailb = 253, /* Transfer mailbox records. */
	202	ns_t_maila = 254, /* Transfer mail agent records. */
	203	ns_t_any = 255, /* Wildcard match. */
	204	};
	205
76473b92	206	#if __FreeBSD__ \|\| __APPLE__ \|\| __OpenBSD__
009f9f55	207	#include <machine/endian.h>
a1a344bf BH	208	#elif __linux__
	209	# include <endian.h>
	210
	211	#else // with thanks to <arpa/nameser.h>
	212
	213	# define LITTLE_ENDIAN 1234 /* least-significant byte first (vax, pc) */
	214	# define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */
	215	# define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp) */
	216
	217	#if defined(vax) \|\| defined(ns32000) \|\| defined(sun386) \|\| defined(i386) \|\| \
	218	defined(__i386) \|\| defined(__ia64) \|\| defined(__amd64) \|\| \
	219	defined(MIPSEL) \|\| defined(_MIPSEL) \|\| defined(BIT_ZERO_ON_RIGHT) \|\| \
	220	defined(__alpha__) \|\| defined(__alpha) \|\| \
	221	(defined(__Lynx__) && defined(__x86__))
	222	# define BYTE_ORDER LITTLE_ENDIAN
	223	#endif
	224
	225	#if defined(sel) \|\| defined(pyr) \|\| defined(mc68000) \|\| defined(sparc) \|\| \
	226	defined(__sparc) \|\| \
	227	defined(is68k) \|\| defined(tahoe) \|\| defined(ibm032) \|\| defined(ibm370) \|\| \
	228	defined(MIPSEB) \|\| defined(_MIPSEB) \|\| defined(_IBMR2) \|\| defined(DGUX) \|\|\
	229	defined(apollo) \|\| defined(__convex__) \|\| defined(_CRAY) \|\| \
	230	defined(__hppa) \|\| defined(__hp9000) \|\| \
	231	defined(__hp9000s300) \|\| defined(__hp9000s700) \|\| \
	232	defined(__hp3000s900) \|\| defined(MPE) \|\| \
	233	defined(BIT_ZERO_ON_LEFT) \|\| defined(m68k) \|\| \
	234	(defined(__Lynx__) && \
	235	(defined(__68k__) \|\| defined(__sparc__) \|\| defined(__powerpc__)))
	236	# define BYTE_ORDER BIG_ENDIAN
	237	#endif
	238
5a57d2ea BH	239	#endif
	240
	241	struct dnsheader {
	242	unsigned id :16; /* query identification number */
	243	#if BYTE_ORDER == BIG_ENDIAN
	244	/* fields in third byte */
	245	unsigned qr: 1; /* response flag */
	246	unsigned opcode: 4; /* purpose of message */
7c696097	247	unsigned aa: 1; /* authoritative answer */
5a57d2ea BH	248	unsigned tc: 1; /* truncated message */
	249	unsigned rd: 1; /* recursion desired */
	250	/* fields in fourth byte */
	251	unsigned ra: 1; /* recursion available */
	252	unsigned unused :1; /* unused bits (MBZ as of 4.9.3a3) */
	253	unsigned ad: 1; /* authentic data from named */
	254	unsigned cd: 1; /* checking disabled by resolver */
	255	unsigned rcode :4; /* response code */
	256	#endif
	257	#if BYTE_ORDER == LITTLE_ENDIAN \|\| BYTE_ORDER == PDP_ENDIAN
	258	/* fields in third byte */
	259	unsigned rd :1; /* recursion desired */
	260	unsigned tc :1; /* truncated message */
7c696097	261	unsigned aa :1; /* authoritative answer */
5a57d2ea BH	262	unsigned opcode :4; /* purpose of message */
	263	unsigned qr :1; /* response flag */
	264	/* fields in fourth byte */
	265	unsigned rcode :4; /* response code */
	266	unsigned cd: 1; /* checking disabled by resolver */
	267	unsigned ad: 1; /* authentic data from named */
	268	unsigned unused :1; /* unused bits (MBZ as of 4.9.3a3) */
	269	unsigned ra :1; /* recursion available */
	270	#endif
	271	/* remaining bytes */
	272	unsigned qdcount :16; /* number of question entries */
	273	unsigned ancount :16; /* number of answer entries */
	274	unsigned nscount :16; /* number of authority entries */
	275	unsigned arcount :16; /* number of resource entries */
	276	};
	277
	278
12c86877 BH	279	#define L theL()
12c86877 BH	280	extern time_t s_starttime;
3ea54bf0	281	std::string questionExpand(const char* packet, uint16_t len, uint16_t& type);
3d40879b	282	bool dnspacketLessThan(const std::string& a, const std::string& b);
213cc78f BH	283
	284	/** helper function for both DNSPacket and addSOARecord() - converts a line into a struct, for easier parsing */
	285	void fillSOAData(const string &content, SOAData &data);
	286
	287	/** for use by DNSPacket, converts a SOAData class to a ascii line again */
	288	string serializeSOAData(const SOAData &data);
	289	string &attodot(string &str); //!< for when you need to insert an email address in the SOA
67672ba6	290	string strrcode(unsigned char rcode);
12c86877	291	#endif