openthread/src/core/net/dnssd_server.hpp

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20 KiB
C++

/*
* Copyright (c) 2021, The OpenThread Authors.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef DNS_SERVER_HPP_
#define DNS_SERVER_HPP_
#include "openthread-core-config.h"
#if OPENTHREAD_CONFIG_DNSSD_SERVER_ENABLE
#include <openthread/dnssd_server.h>
#include "common/as_core_type.hpp"
#include "common/message.hpp"
#include "common/non_copyable.hpp"
#include "common/timer.hpp"
#include "net/dns_types.hpp"
#include "net/ip6.hpp"
#include "net/netif.hpp"
#include "net/srp_server.hpp"
/**
* @file
* This file includes definitions for the DNS-SD server.
*/
namespace ot {
namespace Srp {
class Server;
}
namespace Dns {
namespace ServiceDiscovery {
/**
* This class implements DNS-SD server.
*
*/
class Server : public InstanceLocator, private NonCopyable
{
friend class Srp::Server;
public:
/**
* This class contains the counters of the DNS-SD server.
*
*/
class Counters : public otDnssdCounters, public Clearable<Counters>
{
};
/**
* This enumeration specifies a DNS-SD query type.
*
*/
enum DnsQueryType : uint8_t
{
kDnsQueryNone = OT_DNSSD_QUERY_TYPE_NONE, ///< Service type unspecified.
kDnsQueryBrowse = OT_DNSSD_QUERY_TYPE_BROWSE, ///< Service type browse service.
kDnsQueryResolve = OT_DNSSD_QUERY_TYPE_RESOLVE, ///< Service type resolve service instance.
kDnsQueryResolveHost = OT_DNSSD_QUERY_TYPE_RESOLVE_HOST, ///< Service type resolve hostname.
};
static constexpr uint16_t kPort = OPENTHREAD_CONFIG_DNSSD_SERVER_PORT; ///< The DNS-SD server port.
/**
* This constructor initializes the object.
*
* @param[in] aInstance A reference to the OpenThread instance.
*
*/
explicit Server(Instance &aInstance);
/**
* This method starts the DNS-SD server.
*
* @retval kErrorNone Successfully started the DNS-SD server.
* @retval kErrorFailed If failed to open or bind the UDP socket.
*
*/
Error Start(void);
/**
* This method stops the DNS-SD server.
*
*/
void Stop(void);
/**
* This method sets DNS-SD query callbacks.
*
* @param[in] aSubscribe A pointer to the callback function to subscribe a service or service instance.
* @param[in] aUnsubscribe A pointer to the callback function to unsubscribe a service or service instance.
* @param[in] aContext A pointer to the application-specific context.
*
*/
void SetQueryCallbacks(otDnssdQuerySubscribeCallback aSubscribe,
otDnssdQueryUnsubscribeCallback aUnsubscribe,
void * aContext);
/**
* This method notifies a discovered service instance.
*
* @param[in] aServiceFullName The null-terminated full service name.
* @param[in] aInstanceInfo A reference to the discovered service instance information.
*
*/
void HandleDiscoveredServiceInstance(const char *aServiceFullName, const otDnssdServiceInstanceInfo &aInstanceInfo);
/**
* This method notifies a discovered host.
*
* @param[in] aHostFullName The null-terminated full host name.
* @param[in] aHostInfo A reference to the discovered host information.
*
*/
void HandleDiscoveredHost(const char *aHostFullName, const otDnssdHostInfo &aHostInfo);
/**
* This method acquires the next query in the server.
*
* @param[in] aQuery The query pointer. Pass `nullptr` to get the first query.
*
* @returns A pointer to the query or `nullptr` if no more queries.
*
*/
const otDnssdQuery *GetNextQuery(const otDnssdQuery *aQuery) const;
/**
* This method acquires the DNS-SD query type and name for a specific query.
*
* @param[in] aQuery The query pointer.
* @param[out] aName The name output buffer.
*
* @returns The DNS-SD query type.
*
*/
static DnsQueryType GetQueryTypeAndName(const otDnssdQuery *aQuery, char (&aName)[Name::kMaxNameSize]);
/**
* This method returns the counters of the DNS-SD server.
*
* @returns A reference to the `Counters` instance.
*
*/
const Counters &GetCounters(void) const { return mCounters; };
private:
class NameCompressInfo : public Clearable<NameCompressInfo>
{
public:
explicit NameCompressInfo(void) = default;
explicit NameCompressInfo(const char *aDomainName)
: mDomainName(aDomainName)
, mDomainNameOffset(kUnknownOffset)
, mServiceNameOffset(kUnknownOffset)
, mInstanceNameOffset(kUnknownOffset)
, mHostNameOffset(kUnknownOffset)
{
}
static constexpr uint16_t kUnknownOffset = 0; // Unknown offset value (used when offset is not yet set).
uint16_t GetDomainNameOffset(void) const { return mDomainNameOffset; }
void SetDomainNameOffset(uint16_t aOffset) { mDomainNameOffset = aOffset; }
const char *GetDomainName(void) const { return mDomainName; }
uint16_t GetServiceNameOffset(const Message &aMessage, const char *aServiceName) const
{
return MatchCompressedName(aMessage, mServiceNameOffset, aServiceName)
? mServiceNameOffset
: static_cast<uint16_t>(kUnknownOffset);
};
void SetServiceNameOffset(uint16_t aOffset)
{
if (mServiceNameOffset == kUnknownOffset)
{
mServiceNameOffset = aOffset;
}
}
uint16_t GetInstanceNameOffset(const Message &aMessage, const char *aName) const
{
return MatchCompressedName(aMessage, mInstanceNameOffset, aName) ? mInstanceNameOffset
: static_cast<uint16_t>(kUnknownOffset);
}
void SetInstanceNameOffset(uint16_t aOffset)
{
if (mInstanceNameOffset == kUnknownOffset)
{
mInstanceNameOffset = aOffset;
}
}
uint16_t GetHostNameOffset(const Message &aMessage, const char *aName) const
{
return MatchCompressedName(aMessage, mHostNameOffset, aName) ? mHostNameOffset
: static_cast<uint16_t>(kUnknownOffset);
}
void SetHostNameOffset(uint16_t aOffset)
{
if (mHostNameOffset == kUnknownOffset)
{
mHostNameOffset = aOffset;
}
}
private:
static bool MatchCompressedName(const Message &aMessage, uint16_t aOffset, const char *aName)
{
return aOffset != kUnknownOffset && Name::CompareName(aMessage, aOffset, aName) == kErrorNone;
}
const char *mDomainName; // The serialized domain name.
uint16_t mDomainNameOffset; // Offset of domain name serialization into the response message.
uint16_t mServiceNameOffset; // Offset of service name serialization into the response message.
uint16_t mInstanceNameOffset; // Offset of instance name serialization into the response message.
uint16_t mHostNameOffset; // Offset of host name serialization into the response message.
};
static constexpr bool kBindUnspecifiedNetif = OPENTHREAD_CONFIG_DNSSD_SERVER_BIND_UNSPECIFIED_NETIF;
static constexpr uint8_t kProtocolLabelLength = 4;
static constexpr uint8_t kSubTypeLabelLength = 4;
static constexpr uint16_t kMaxConcurrentQueries = 32;
// This structure represents the splitting information of a full name.
struct NameComponentsOffsetInfo
{
static constexpr uint8_t kNotPresent = 0xff; // Indicates the component is not present.
explicit NameComponentsOffsetInfo(void)
: mDomainOffset(kNotPresent)
, mProtocolOffset(kNotPresent)
, mServiceOffset(kNotPresent)
, mSubTypeOffset(kNotPresent)
, mInstanceOffset(kNotPresent)
{
}
bool IsServiceInstanceName(void) const { return mInstanceOffset != kNotPresent; }
bool IsServiceName(void) const { return mServiceOffset != kNotPresent && mInstanceOffset == kNotPresent; }
bool IsHostName(void) const { return mProtocolOffset == kNotPresent && mDomainOffset != 0; }
uint8_t mDomainOffset; // The offset to the beginning of <Domain>.
uint8_t mProtocolOffset; // The offset to the beginning of <Protocol> (i.e. _tcp or _udp) or `kNotPresent` if
// the name is not a service or instance.
uint8_t mServiceOffset; // The offset to the beginning of <Service> or `kNotPresent` if the name is not a
// service or instance.
uint8_t mSubTypeOffset; // The offset to the beginning of sub-type label or `kNotPresent` is not a sub-type.
uint8_t mInstanceOffset; // The offset to the beginning of <Instance> or `kNotPresent` if the name is not a
// instance.
};
/**
* This class contains the compress information for a dns packet.
*
*/
class QueryTransaction : public InstanceLocatorInit
{
public:
explicit QueryTransaction(void)
: mResponseMessage(nullptr)
{
}
void Init(const Header & aResponseHeader,
Message & aResponseMessage,
const NameCompressInfo &aCompressInfo,
const Ip6::MessageInfo &aMessageInfo,
Instance & aInstance);
bool IsValid(void) const { return mResponseMessage != nullptr; }
const Ip6::MessageInfo &GetMessageInfo(void) const { return mMessageInfo; }
const Header & GetResponseHeader(void) const { return mResponseHeader; }
Header & GetResponseHeader(void) { return mResponseHeader; }
const Message & GetResponseMessage(void) const { return *mResponseMessage; }
Message & GetResponseMessage(void) { return *mResponseMessage; }
TimeMilli GetStartTime(void) const { return mStartTime; }
NameCompressInfo & GetNameCompressInfo(void) { return mCompressInfo; };
void Finalize(Header::Response aResponseMessage, Ip6::Udp::Socket &aSocket);
Header mResponseHeader;
Message * mResponseMessage;
NameCompressInfo mCompressInfo;
Ip6::MessageInfo mMessageInfo;
TimeMilli mStartTime;
};
static constexpr uint32_t kQueryTimeout = OPENTHREAD_CONFIG_DNSSD_QUERY_TIMEOUT;
bool IsRunning(void) const { return mSocket.IsBound(); }
static void HandleUdpReceive(void *aContext, otMessage *aMessage, const otMessageInfo *aMessageInfo);
void HandleUdpReceive(Message &aMessage, const Ip6::MessageInfo &aMessageInfo);
void ProcessQuery(const Header &aRequestHeader, Message &aRequestMessage, const Ip6::MessageInfo &aMessageInfo);
static Header::Response AddQuestions(const Header & aRequestHeader,
const Message & aRequestMessage,
Header & aResponseHeader,
Message & aResponseMessage,
NameCompressInfo &aCompressInfo);
static Error AppendQuestion(const char * aName,
const Question & aQuestion,
Message & aMessage,
NameCompressInfo &aCompressInfo);
static Error AppendPtrRecord(Message & aMessage,
const char * aServiceName,
const char * aInstanceName,
uint32_t aTtl,
NameCompressInfo &aCompressInfo);
static Error AppendSrvRecord(Message & aMessage,
const char * aInstanceName,
const char * aHostName,
uint32_t aTtl,
uint16_t aPriority,
uint16_t aWeight,
uint16_t aPort,
NameCompressInfo &aCompressInfo);
static Error AppendTxtRecord(Message & aMessage,
const char * aInstanceName,
const void * aTxtData,
uint16_t aTxtLength,
uint32_t aTtl,
NameCompressInfo &aCompressInfo);
static Error AppendAaaaRecord(Message & aMessage,
const char * aHostName,
const Ip6::Address &aAddress,
uint32_t aTtl,
NameCompressInfo & aCompressInfo);
static Error AppendServiceName(Message &aMessage, const char *aName, NameCompressInfo &aCompressInfo);
static Error AppendInstanceName(Message &aMessage, const char *aName, NameCompressInfo &aCompressInfo);
static Error AppendHostName(Message &aMessage, const char *aName, NameCompressInfo &aCompressInfo);
static void IncResourceRecordCount(Header &aHeader, bool aAdditional);
static Error FindNameComponents(const char *aName, const char *aDomain, NameComponentsOffsetInfo &aInfo);
static Error FindPreviousLabel(const char *aName, uint8_t &aStart, uint8_t &aStop);
void SendResponse(Header aHeader,
Header::Response aResponseCode,
Message & aMessage,
const Ip6::MessageInfo &aMessageInfo,
Ip6::Udp::Socket & aSocket);
#if OPENTHREAD_CONFIG_SRP_SERVER_ENABLE
Header::Response ResolveBySrp(Header & aResponseHeader,
Message & aResponseMessage,
Server::NameCompressInfo &aCompressInfo);
Header::Response ResolveQuestionBySrp(const char * aName,
const Question & aQuestion,
Header & aResponseHeader,
Message & aResponseMessage,
NameCompressInfo &aCompressInfo,
bool aAdditional);
const Srp::Server::Host * GetNextSrpHost(const Srp::Server::Host *aHost);
static const Srp::Server::Service *GetNextSrpService(const Srp::Server::Host & aHost,
const Srp::Server::Service *aService);
#endif
Error ResolveByQueryCallbacks(Header & aResponseHeader,
Message & aResponseMessage,
NameCompressInfo & aCompressInfo,
const Ip6::MessageInfo &aMessageInfo);
QueryTransaction *NewQuery(const Header & aResponseHeader,
Message & aResponseMessage,
const NameCompressInfo &aCompressInfo,
const Ip6::MessageInfo &aMessageInfo);
static bool CanAnswerQuery(const QueryTransaction & aQuery,
const char * aServiceFullName,
const otDnssdServiceInstanceInfo &aInstanceInfo);
void AnswerQuery(QueryTransaction & aQuery,
const char * aServiceFullName,
const otDnssdServiceInstanceInfo &aInstanceInfo);
static bool CanAnswerQuery(const Server::QueryTransaction &aQuery, const char *aHostFullName);
void AnswerQuery(QueryTransaction &aQuery, const char *aHostFullName, const otDnssdHostInfo &aHostInfo);
void FinalizeQuery(QueryTransaction &aQuery, Header::Response aResponseCode);
static DnsQueryType GetQueryTypeAndName(const Header & aHeader,
const Message &aMessage,
char (&aName)[Name::kMaxNameSize]);
static bool HasQuestion(const Header &aHeader, const Message &aMessage, const char *aName, uint16_t aQuestionType);
static void HandleTimer(Timer &aTimer);
void HandleTimer(void);
void ResetTimer(void);
void UpdateResponseCounters(Header::Response aResponseCode);
static const char kDnssdProtocolUdp[];
static const char kDnssdProtocolTcp[];
static const char kDnssdSubTypeLabel[];
static const char kDefaultDomainName[];
Ip6::Udp::Socket mSocket;
QueryTransaction mQueryTransactions[kMaxConcurrentQueries];
void * mQueryCallbackContext;
otDnssdQuerySubscribeCallback mQuerySubscribe;
otDnssdQueryUnsubscribeCallback mQueryUnsubscribe;
TimerMilli mTimer;
Counters mCounters;
};
} // namespace ServiceDiscovery
} // namespace Dns
DefineMapEnum(otDnssdQueryType, Dns::ServiceDiscovery::Server::DnsQueryType);
} // namespace ot
#endif // OPENTHREAD_CONFIG_DNSSD_SERVER_ENABLE
#endif // DNS_SERVER_HPP_