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/*
*
* (C) 2003-2023 Anope Team
* Contact us at team@anope.org
*
* Please read COPYING and README for further details.
*
* Based on the original code of Epona by Lara.
* Based on the original code of Services by Andy Church.
*/
#ifndef DNS_H
#define DNS_H
namespace DNS
{
/** Valid query types
*/
enum QueryType
{
/* Nothing */
QUERY_NONE,
/* A simple A lookup */
QUERY_A = 1,
/* An authoritative name server */
QUERY_NS = 2,
/* A CNAME lookup */
QUERY_CNAME = 5,
/* Start of a zone of authority */
QUERY_SOA = 6,
/* Reverse DNS lookup */
QUERY_PTR = 12,
/* IPv6 AAAA lookup */
QUERY_AAAA = 28,
/* Zone transfer */
QUERY_AXFR = 252,
/* A lookup for any record */
QUERY_ANY = 255
};
/** Flags that can be AND'd into DNSPacket::flags to receive certain values
*/
enum
{
QUERYFLAGS_QR = 0x8000,
QUERYFLAGS_OPCODE = 0x7800,
QUERYFLAGS_OPCODE_NOTIFY = 0x2000,
QUERYFLAGS_AA = 0x400,
QUERYFLAGS_TC = 0x200,
QUERYFLAGS_RD = 0x100,
QUERYFLAGS_RA = 0x80,
QUERYFLAGS_Z = 0x70,
QUERYFLAGS_RCODE = 0xF
};
enum Error
{
ERROR_NONE,
ERROR_UNKNOWN,
ERROR_UNLOADED,
ERROR_TIMEDOUT,
ERROR_NOT_AN_ANSWER,
ERROR_NONSTANDARD_QUERY,
ERROR_FORMAT_ERROR,
ERROR_SERVER_FAILURE,
ERROR_DOMAIN_NOT_FOUND,
ERROR_NOT_IMPLEMENTED,
ERROR_REFUSED,
ERROR_NO_RECORDS,
ERROR_INVALIDTYPE
};
struct Question
{
Anope::string name;
QueryType type;
unsigned short qclass;
Question() : type(QUERY_NONE), qclass(0) { }
Question(const Anope::string &n, QueryType t, unsigned short c = 1) : name(n), type(t), qclass(c) { }
inline bool operator==(const Question & other) const { return name == other.name && type == other.type && qclass == other.qclass; }
struct hash
{
size_t operator()(const Question &q) const
{
return Anope::hash_ci()(q.name);
}
};
};
struct ResourceRecord : Question
{
unsigned int ttl;
Anope::string rdata;
time_t created;
ResourceRecord(const Anope::string &n, QueryType t, unsigned short c = 1) : Question(n, t, c), ttl(0), created(Anope::CurTime) { }
ResourceRecord(const Question &q) : Question(q), ttl(0), created(Anope::CurTime) { }
};
struct Query
{
std::vector<Question> questions;
std::vector<ResourceRecord> answers, authorities, additional;
Error error;
Query() : error(ERROR_NONE) { }
Query(const Question &q) : error(ERROR_NONE) { questions.push_back(q); }
};
class ReplySocket;
class Request;
/** DNS manager
*/
class Manager : public Service
{
public:
Manager(Module *creator) : Service(creator, "DNS::Manager", "dns/manager") { }
virtual ~Manager() { }
virtual void Process(Request *req) = 0;
virtual void RemoveRequest(Request *req) = 0;
virtual bool HandlePacket(ReplySocket *s, const unsigned char *const data, int len, sockaddrs *from) = 0;
virtual void UpdateSerial() = 0;
virtual void Notify(const Anope::string &zone) = 0;
virtual uint32_t GetSerial() const = 0;
};
/** A DNS query.
*/
class Request : public Timer, public Question
{
Manager *manager;
public:
/* Use result cache if available */
bool use_cache;
/* Request id */
unsigned short id;
/* Creator of this request */
Module *creator;
Request(Manager *mgr, Module *c, const Anope::string &addr, QueryType qt, bool cache = false) : Timer(0), Question(addr, qt), manager(mgr),
use_cache(cache), id(0), creator(c) { }
virtual ~Request()
{
manager->RemoveRequest(this);
}
/** Called when this request succeeds
* @param r The query sent back from the nameserver
*/
virtual void OnLookupComplete(const Query *r) = 0;
/** Called when this request fails or times out.
* @param r The query sent back from the nameserver, check the error code.
*/
virtual void OnError(const Query *r) { }
/** Used to time out the query, xalls OnError and lets the TimerManager
* delete this request.
*/
void Tick(time_t) anope_override
{
Log(LOG_DEBUG_2) << "Resolver: timeout for query " << this->name;
Query rr(*this);
rr.error = ERROR_TIMEDOUT;
this->OnError(&rr);
}
};
} // namespace DNS
#endif // DNS_H
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