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DnssdImpl.cpp
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DnssdImpl.cpp
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/*
*
* Copyright (c) 2021-2022 Project CHIP Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "DnssdImpl.h"
#include "DnssdType.h"
#include "MdnsError.h"
#include <cstdio>
#include <lib/support/CHIPMemString.h>
#include <lib/support/CodeUtils.h>
#include <lib/support/SafeInt.h>
#include <lib/support/logging/CHIPLogging.h>
#include <platform/CHIPDeviceLayer.h>
using namespace chip::Dnssd;
using namespace chip::Dnssd::Internal;
namespace {
constexpr const char * kLocalDot = "local.";
constexpr DNSServiceFlags kRegisterFlags = kDNSServiceFlagsNoAutoRename;
constexpr DNSServiceFlags kBrowseFlags = 0;
constexpr DNSServiceFlags kGetAddrInfoFlags = kDNSServiceFlagsTimeout | kDNSServiceFlagsShareConnection;
constexpr DNSServiceFlags kResolveFlags = kDNSServiceFlagsShareConnection;
constexpr DNSServiceFlags kReconfirmRecordFlags = 0;
bool IsSupportedProtocol(DnssdServiceProtocol protocol)
{
return (protocol == DnssdServiceProtocol::kDnssdProtocolUdp) || (protocol == DnssdServiceProtocol::kDnssdProtocolTcp);
}
uint32_t GetInterfaceId(chip::Inet::InterfaceId interfaceId)
{
return interfaceId.IsPresent() ? interfaceId.GetPlatformInterface() : kDNSServiceInterfaceIndexAny;
}
std::string GetHostNameWithDomain(const char * hostname)
{
return std::string(hostname) + '.' + kLocalDot;
}
void LogOnFailure(const char * name, DNSServiceErrorType err)
{
if (kDNSServiceErr_NoError != err)
{
ChipLogError(Discovery, "%s (%s)", StringOrNullMarker(name), Error::ToString(err));
}
}
class ScopedTXTRecord
{
public:
ScopedTXTRecord() {}
~ScopedTXTRecord()
{
if (mDataSize != 0)
{
TXTRecordDeallocate(&mRecordRef);
}
}
CHIP_ERROR Init(TextEntry * textEntries, size_t textEntrySize)
{
VerifyOrReturnError(textEntrySize <= kDnssdTextMaxSize, CHIP_ERROR_INVALID_ARGUMENT);
TXTRecordCreate(&mRecordRef, sizeof(mRecordBuffer), mRecordBuffer);
for (size_t i = 0; i < textEntrySize; i++)
{
TextEntry entry = textEntries[i];
VerifyOrReturnError(chip::CanCastTo<uint8_t>(entry.mDataSize), CHIP_ERROR_INVALID_ARGUMENT);
auto err = TXTRecordSetValue(&mRecordRef, entry.mKey, static_cast<uint8_t>(entry.mDataSize), entry.mData);
VerifyOrReturnError(err == kDNSServiceErr_NoError, CHIP_ERROR_INVALID_ARGUMENT);
}
mDataSize = TXTRecordGetLength(&mRecordRef);
if (mDataSize == 0)
{
TXTRecordDeallocate(&mRecordRef);
}
mData = TXTRecordGetBytesPtr(&mRecordRef);
return CHIP_NO_ERROR;
}
uint16_t size() { return mDataSize; }
const void * data() { return mData; }
private:
uint16_t mDataSize = 0;
const void * mData = nullptr;
TXTRecordRef mRecordRef;
char mRecordBuffer[kDnssdTextMaxSize];
};
std::shared_ptr<uint32_t> GetCounterHolder(const char * name)
{
// This is a little silly, in that resolves for the same name, type, etc get
// coalesced by the underlying mDNSResponder anyway. But we need to keep
// track of our context/callback/etc, (even though in practice it's always
// exactly the same) and the interface id (which might actually be different
// for different Resolve calls). So for now just keep using a
// ResolveContext to track all that.
if (auto existingCtx = MdnsContexts::GetInstance().GetExistingResolveForInstanceName(name))
{
return existingCtx->consumerCounter;
}
return std::make_shared<uint32_t>(0);
}
} // namespace
namespace chip {
namespace Dnssd {
Global<MdnsContexts> MdnsContexts::sInstance;
namespace {
static void OnRegister(DNSServiceRef sdRef, DNSServiceFlags flags, DNSServiceErrorType err, const char * name, const char * type,
const char * domain, void * context)
{
ChipLogProgress(Discovery, "Mdns: %s name: %s, type: %s, domain: %s, flags: %d", __func__, StringOrNullMarker(name),
StringOrNullMarker(type), StringOrNullMarker(domain), flags);
auto sdCtx = reinterpret_cast<RegisterContext *>(context);
sdCtx->Finalize(err);
};
CHIP_ERROR Register(void * context, DnssdPublishCallback callback, uint32_t interfaceId, const char * type, const char * name,
uint16_t port, ScopedTXTRecord & record, Inet::IPAddressType addressType, const char * hostname)
{
ChipLogProgress(Discovery, "Registering service %s on host %s with port %u and type: %s on interface id: %" PRIu32,
StringOrNullMarker(name), StringOrNullMarker(hostname), port, StringOrNullMarker(type), interfaceId);
RegisterContext * sdCtx = nullptr;
if (CHIP_NO_ERROR == MdnsContexts::GetInstance().GetRegisterContextOfTypeAndName(type, name, &sdCtx))
{
auto err = DNSServiceUpdateRecord(sdCtx->serviceRef, nullptr, kRegisterFlags, record.size(), record.data(), 0 /* ttl */);
VerifyOrReturnError(kDNSServiceErr_NoError == err, sdCtx->Finalize(err));
return CHIP_NO_ERROR;
}
sdCtx = chip::Platform::New<RegisterContext>(type, name, callback, context);
VerifyOrReturnError(nullptr != sdCtx, CHIP_ERROR_NO_MEMORY);
auto err = sdCtx->mHostNameRegistrar.Init(hostname, addressType, interfaceId);
VerifyOrReturnError(kDNSServiceErr_NoError == err, sdCtx->Finalize(err));
DNSServiceRef sdRef;
err = DNSServiceRegister(&sdRef, kRegisterFlags, interfaceId, name, type, kLocalDot, hostname, htons(port), record.size(),
record.data(), OnRegister, sdCtx);
VerifyOrReturnError(kDNSServiceErr_NoError == err, sdCtx->Finalize(err));
return MdnsContexts::GetInstance().Add(sdCtx, sdRef);
}
static void OnBrowse(DNSServiceRef sdRef, DNSServiceFlags flags, uint32_t interfaceId, DNSServiceErrorType err, const char * name,
const char * type, const char * domain, void * context)
{
auto sdCtx = reinterpret_cast<BrowseHandler *>(context);
VerifyOrReturn(kDNSServiceErr_NoError == err, sdCtx->Finalize(err));
sdCtx->OnBrowse(flags, name, type, domain, interfaceId);
}
CHIP_ERROR Browse(BrowseHandler * sdCtx, uint32_t interfaceId, const char * type)
{
ChipLogProgress(Discovery, "Browsing for: %s", StringOrNullMarker(type));
DNSServiceRef sdRef;
auto err = DNSServiceBrowse(&sdRef, kBrowseFlags, interfaceId, type, kLocalDot, OnBrowse, sdCtx);
VerifyOrReturnError(kDNSServiceErr_NoError == err, sdCtx->Finalize(err));
return MdnsContexts::GetInstance().Add(sdCtx, sdRef);
}
CHIP_ERROR Browse(void * context, DnssdBrowseCallback callback, uint32_t interfaceId, const char * type,
DnssdServiceProtocol protocol, intptr_t * browseIdentifier)
{
auto sdCtx = chip::Platform::New<BrowseContext>(context, callback, protocol);
VerifyOrReturnError(nullptr != sdCtx, CHIP_ERROR_NO_MEMORY);
ReturnErrorOnFailure(Browse(sdCtx, interfaceId, type));
*browseIdentifier = reinterpret_cast<intptr_t>(sdCtx);
return CHIP_NO_ERROR;
}
CHIP_ERROR Browse(DnssdBrowseDelegate * delegate, uint32_t interfaceId, const char * type, DnssdServiceProtocol protocol)
{
auto sdCtx = chip::Platform::New<BrowseWithDelegateContext>(delegate, protocol);
VerifyOrReturnError(nullptr != sdCtx, CHIP_ERROR_NO_MEMORY);
return Browse(sdCtx, interfaceId, type);
}
static void OnGetAddrInfo(DNSServiceRef sdRef, DNSServiceFlags flags, uint32_t interfaceId, DNSServiceErrorType err,
const char * hostname, const struct sockaddr * address, uint32_t ttl, void * context)
{
ChipLogProgress(Discovery, "Mdns: %s flags: %d, interface: %u, hostname: %s", __func__, flags, (unsigned) interfaceId,
StringOrNullMarker(hostname));
auto sdCtx = reinterpret_cast<ResolveContext *>(context);
ReturnOnFailure(MdnsContexts::GetInstance().Has(sdCtx));
LogOnFailure(__func__, err);
if (kDNSServiceErr_NoError == err)
{
sdCtx->OnNewAddress(interfaceId, address);
}
if (!(flags & kDNSServiceFlagsMoreComing))
{
VerifyOrReturn(sdCtx->HasAddress(), sdCtx->Finalize(kDNSServiceErr_BadState));
sdCtx->Finalize();
}
}
static void GetAddrInfo(ResolveContext * sdCtx)
{
auto protocol = sdCtx->protocol;
for (auto & interface : sdCtx->interfaces)
{
auto interfaceId = interface.first;
auto hostname = interface.second.fullyQualifiedDomainName.c_str();
auto sdRefCopy = sdCtx->serviceRef; // Mandatory copy because of kDNSServiceFlagsShareConnection
auto err = DNSServiceGetAddrInfo(&sdRefCopy, kGetAddrInfoFlags, interfaceId, protocol, hostname, OnGetAddrInfo, sdCtx);
VerifyOrReturn(kDNSServiceErr_NoError == err, sdCtx->Finalize(err));
}
}
static void OnResolve(DNSServiceRef sdRef, DNSServiceFlags flags, uint32_t interfaceId, DNSServiceErrorType err,
const char * fullname, const char * hostname, uint16_t port, uint16_t txtLen, const unsigned char * txtRecord,
void * context)
{
ChipLogProgress(Discovery, "Mdns: %s flags: %d, interface: %u, fullname: %s, hostname: %s, port: %u", __func__, flags,
(unsigned) interfaceId, StringOrNullMarker(fullname), StringOrNullMarker(hostname), ntohs(port));
auto sdCtx = reinterpret_cast<ResolveContext *>(context);
ReturnOnFailure(MdnsContexts::GetInstance().Has(sdCtx));
LogOnFailure(__func__, err);
if (kDNSServiceErr_NoError == err)
{
sdCtx->OnNewInterface(interfaceId, fullname, hostname, port, txtLen, txtRecord);
}
if (!(flags & kDNSServiceFlagsMoreComing))
{
VerifyOrReturn(sdCtx->HasInterface(), sdCtx->Finalize(kDNSServiceErr_BadState));
GetAddrInfo(sdCtx);
}
}
static CHIP_ERROR Resolve(ResolveContext * sdCtx, uint32_t interfaceId, chip::Inet::IPAddressType addressType, const char * type,
const char * name)
{
ChipLogProgress(Discovery, "Resolve type=%s name=%s interface=%" PRIu32, StringOrNullMarker(type), StringOrNullMarker(name),
interfaceId);
auto err = DNSServiceCreateConnection(&sdCtx->serviceRef);
VerifyOrReturnError(kDNSServiceErr_NoError == err, sdCtx->Finalize(err));
auto sdRefCopy = sdCtx->serviceRef; // Mandatory copy because of kDNSServiceFlagsShareConnection
err = DNSServiceResolve(&sdRefCopy, kResolveFlags, interfaceId, name, type, kLocalDot, OnResolve, sdCtx);
VerifyOrReturnError(kDNSServiceErr_NoError == err, sdCtx->Finalize(err));
auto retval = MdnsContexts::GetInstance().Add(sdCtx, sdCtx->serviceRef);
if (retval == CHIP_NO_ERROR)
{
(*(sdCtx->consumerCounter))++;
}
return retval;
}
static CHIP_ERROR Resolve(void * context, DnssdResolveCallback callback, uint32_t interfaceId,
chip::Inet::IPAddressType addressType, const char * type, const char * name)
{
auto counterHolder = GetCounterHolder(name);
auto sdCtx = chip::Platform::New<ResolveContext>(context, callback, addressType, name,
BrowseContext::sContextDispatchingSuccess, std::move(counterHolder));
VerifyOrReturnError(nullptr != sdCtx, CHIP_ERROR_NO_MEMORY);
return Resolve(sdCtx, interfaceId, addressType, type, name);
}
static CHIP_ERROR Resolve(CommissioningResolveDelegate * delegate, uint32_t interfaceId, chip::Inet::IPAddressType addressType,
const char * type, const char * name)
{
auto counterHolder = GetCounterHolder(name);
auto sdCtx = chip::Platform::New<ResolveContext>(delegate, addressType, name, std::move(counterHolder));
VerifyOrReturnError(nullptr != sdCtx, CHIP_ERROR_NO_MEMORY);
return Resolve(sdCtx, interfaceId, addressType, type, name);
}
} // namespace
CHIP_ERROR ChipDnssdInit(DnssdAsyncReturnCallback successCallback, DnssdAsyncReturnCallback errorCallback, void * context)
{
VerifyOrReturnError(successCallback != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrReturnError(errorCallback != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
successCallback(context, CHIP_NO_ERROR);
return CHIP_NO_ERROR;
}
void ChipDnssdShutdown()
{
// Drop our existing advertisements now, so they don't stick around while we
// are not actually in a responsive state.
ChipDnssdRemoveServices();
}
CHIP_ERROR ChipDnssdPublishService(const DnssdService * service, DnssdPublishCallback callback, void * context)
{
VerifyOrReturnError(service != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrReturnError(IsSupportedProtocol(service->mProtocol), CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrReturnError(callback != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrReturnError(strcmp(service->mHostName, "") != 0, CHIP_ERROR_INVALID_ARGUMENT);
ScopedTXTRecord record;
ReturnErrorOnFailure(record.Init(service->mTextEntries, service->mTextEntrySize));
auto regtype = GetFullTypeWithSubTypes(service);
auto interfaceId = GetInterfaceId(service->mInterface);
auto hostname = GetHostNameWithDomain(service->mHostName);
return Register(context, callback, interfaceId, regtype.c_str(), service->mName, service->mPort, record, service->mAddressType,
hostname.c_str());
}
CHIP_ERROR ChipDnssdRemoveServices()
{
assertChipStackLockedByCurrentThread();
auto err = MdnsContexts::GetInstance().RemoveAllOfType(ContextType::Register);
if (CHIP_ERROR_KEY_NOT_FOUND == err)
{
err = CHIP_NO_ERROR;
}
return err;
}
CHIP_ERROR ChipDnssdFinalizeServiceUpdate()
{
return CHIP_NO_ERROR;
}
CHIP_ERROR ChipDnssdBrowse(const char * type, DnssdServiceProtocol protocol, chip::Inet::IPAddressType addressType,
chip::Inet::InterfaceId interface, DnssdBrowseCallback callback, void * context,
intptr_t * browseIdentifier)
{
VerifyOrReturnError(type != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrReturnError(callback != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrReturnError(IsSupportedProtocol(protocol), CHIP_ERROR_INVALID_ARGUMENT);
auto regtype = GetFullTypeWithSubTypes(type, protocol);
auto interfaceId = GetInterfaceId(interface);
return Browse(context, callback, interfaceId, regtype.c_str(), protocol, browseIdentifier);
}
CHIP_ERROR ChipDnssdStopBrowse(intptr_t browseIdentifier)
{
auto ctx = reinterpret_cast<GenericContext *>(browseIdentifier);
if (MdnsContexts::GetInstance().Has(ctx) != CHIP_NO_ERROR)
{
return CHIP_ERROR_NOT_FOUND;
}
// We know this is an actual context now, so can check the type.
if (ctx->type != ContextType::Browse)
{
// stale pointer that got reallocated.
return CHIP_ERROR_NOT_FOUND;
}
// We have been canceled. Don't bother delivering the partial
// results we have queued up in the BrowseContext, if any. In practice
// there shouldn't be anything there long-term anyway.
//
// Make sure to cancel all the resolves first, before we cancel the
// browse (just to avoid dangling pointers in the resolves, even though we
// only use them for equality compares).
std::vector<GenericContext *> resolves;
MdnsContexts::GetInstance().FindAllMatchingPredicate(
[ctx](GenericContext * item) {
return item->type == ContextType::Resolve && static_cast<ResolveContext *>(item)->browseThatCausedResolve == ctx;
},
resolves);
for (auto & resolve : resolves)
{
resolve->Finalize(CHIP_ERROR_CANCELLED);
}
ctx->Finalize(CHIP_ERROR_CANCELLED);
return CHIP_NO_ERROR;
}
CHIP_ERROR ChipDnssdBrowse(const char * type, DnssdServiceProtocol protocol, chip::Inet::IPAddressType addressType,
chip::Inet::InterfaceId interface, DnssdBrowseDelegate * delegate)
{
VerifyOrReturnError(type != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrReturnError(delegate != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrReturnError(IsSupportedProtocol(protocol), CHIP_ERROR_INVALID_ARGUMENT);
auto regtype = GetFullTypeWithSubTypes(type, protocol);
auto interfaceId = GetInterfaceId(interface);
return Browse(delegate, interfaceId, regtype.c_str(), protocol);
}
CHIP_ERROR ChipDnssdStopBrowse(DnssdBrowseDelegate * delegate)
{
auto existingCtx = MdnsContexts::GetInstance().GetExistingBrowseForDelegate(delegate);
if (existingCtx == nullptr)
{
return CHIP_ERROR_NOT_FOUND;
}
return existingCtx->Finalize(kDNSServiceErr_NoError);
}
CHIP_ERROR ChipDnssdResolve(DnssdService * service, chip::Inet::InterfaceId interface, DnssdResolveCallback callback,
void * context)
{
VerifyOrReturnError(service != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrReturnError(IsSupportedProtocol(service->mProtocol), CHIP_ERROR_INVALID_ARGUMENT);
auto regtype = GetFullType(service);
auto interfaceId = GetInterfaceId(interface);
return Resolve(context, callback, interfaceId, service->mAddressType, regtype.c_str(), service->mName);
}
CHIP_ERROR ChipDnssdResolve(DnssdService * service, chip::Inet::InterfaceId interface, CommissioningResolveDelegate * delegate)
{
VerifyOrReturnError(service != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
VerifyOrReturnError(IsSupportedProtocol(service->mProtocol), CHIP_ERROR_INVALID_ARGUMENT);
auto regtype = GetFullType(service);
auto interfaceId = GetInterfaceId(interface);
return Resolve(delegate, interfaceId, service->mAddressType, regtype.c_str(), service->mName);
}
void ChipDnssdResolveNoLongerNeeded(const char * instanceName)
{
ChipLogProgress(Discovery, "No longer need resolve for %s", instanceName);
auto existingCtx = MdnsContexts::GetInstance().GetExistingResolveForInstanceName(instanceName);
VerifyOrReturn(existingCtx != nullptr);
VerifyOrReturn(*existingCtx->consumerCounter != 0);
(*existingCtx->consumerCounter)--;
if (*existingCtx->consumerCounter == 0)
{
// No more consumers; clear out all of these resolves so they don't
// stick around. Dispatch a "cancelled" failure on all of them to make
// sure whatever kicked them off cleans up resources as needed.
do
{
existingCtx->Finalize(CHIP_ERROR_CANCELLED);
existingCtx = MdnsContexts::GetInstance().GetExistingResolveForInstanceName(instanceName);
} while (existingCtx != nullptr);
}
}
CHIP_ERROR ChipDnssdReconfirmRecord(const char * hostname, chip::Inet::IPAddress address, chip::Inet::InterfaceId interface)
{
VerifyOrReturnError(hostname != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
auto interfaceId = interface.GetPlatformInterface();
auto rrclass = kDNSServiceClass_IN;
auto fullname = GetHostNameWithDomain(hostname);
uint16_t rrtype;
uint16_t rdlen;
const void * rdata;
in6_addr ipv6;
#if INET_CONFIG_ENABLE_IPV4
in_addr ipv4;
#endif // INET_CONFIG_ENABLE_IPV4
if (address.IsIPv6())
{
ipv6 = address.ToIPv6();
rrtype = kDNSServiceType_AAAA;
rdlen = static_cast<uint16_t>(sizeof(in6_addr));
rdata = &ipv6;
}
#if INET_CONFIG_ENABLE_IPV4
else if (address.IsIPv4())
{
ipv4 = address.ToIPv4();
rrtype = kDNSServiceType_A;
rdlen = static_cast<uint16_t>(sizeof(in_addr));
rdata = &ipv4;
}
#endif // INET_CONFIG_ENABLE_IPV4
else
{
return CHIP_ERROR_INVALID_ARGUMENT;
}
auto error = DNSServiceReconfirmRecord(kReconfirmRecordFlags, interfaceId, fullname.c_str(), rrtype, rrclass, rdlen, rdata);
LogOnFailure(__func__, error);
return Error::ToChipError(error);
}
} // namespace Dnssd
} // namespace chip