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// Copyright 2020-2021 The Mumble Developers. All rights reserved.
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file at the root of the
// Mumble source tree or at <https://www.mumble.info/LICENSE>.
#include "Zeroconf.h"
#define GET_SYMBOL(symbol) (symbol = reinterpret_cast< decltype(symbol) >(GetProcAddress(handle, #symbol)))
Zeroconf::Zeroconf() : m_ok(false) {
#ifdef Q_OS_WIN
auto handle = GetModuleHandle(L"dnsapi.dll");
if (handle) {
GET_SYMBOL(DnsServiceConstructInstance);
GET_SYMBOL(DnsServiceFreeInstance);
GET_SYMBOL(DnsServiceRegister);
GET_SYMBOL(DnsServiceDeRegister);
GET_SYMBOL(DnsServiceRegisterCancel);
if (DnsServiceConstructInstance && DnsServiceFreeInstance && DnsServiceRegister && DnsServiceDeRegister
&& DnsServiceRegisterCancel) {
m_ok = true;
return;
}
}
qWarning("Zeroconf: Native mDNS/DNS-SD API not available, falling back to third-party API");
handle = LoadLibrary(L"dnssd.dll");
if (!handle) {
qWarning("Zeroconf: Failed to load dnssd.dll, assuming third-party API is not available");
return;
}
FreeLibrary(handle);
#endif
resetHelper();
m_ok = true;
}
Zeroconf::~Zeroconf() {
if (!m_helper) {
unregisterService();
}
}
void Zeroconf::resetHelper() {
m_helper.reset(new BonjourServiceRegister(this));
connect(m_helper.get(), &BonjourServiceRegister::error, this, &Zeroconf::helperError);
}
bool Zeroconf::registerService(const BonjourRecord &record, const uint16_t port) {
if (!m_ok) {
return false;
}
unregisterService();
if (m_helper) {
m_helper->registerService(record, port);
return true;
}
#ifdef Q_OS_WIN
DWORD size = 0;
GetComputerNameEx(ComputerNameDnsHostname, nullptr, &size);
std::vector< wchar_t > hostname(size);
if (!GetComputerNameEx(ComputerNameDnsHostname, &hostname[0], &size)) {
qWarning("Zeroconf: GetComputerNameEx() failed with error %u!", GetLastError());
return false;
}
const auto domain = record.replyDomain.isEmpty() ? L".local" : L"." + record.replyDomain.toStdWString();
const auto qualifiedHostname = &hostname[0] + domain;
auto service = record.serviceName.isEmpty() ? &hostname[0] : record.serviceName.toStdWString();
service += L".";
service += record.registeredType.toStdWString();
service += domain;
auto instance = DnsServiceConstructInstance(service.c_str(), qualifiedHostname.c_str(), nullptr, nullptr, port, 0,
0, 0, nullptr, nullptr);
if (!instance) {
qWarning("Zeroconf: DnsServiceConstructInstance() returned nullptr!");
return false;
}
m_request.reset(new DNS_SERVICE_REGISTER_REQUEST{});
m_request->Version = DNS_QUERY_REQUEST_VERSION1;
m_request->pServiceInstance = instance;
m_request->pRegisterCompletionCallback = callbackRegisterComplete;
m_request->pQueryContext = this;
m_cancel.reset(new DNS_SERVICE_CANCEL{});
const auto ret = DnsServiceRegister(m_request.get(), m_cancel.get());
DnsServiceFreeInstance(instance);
if (ret == DNS_REQUEST_PENDING) {
return true;
}
qWarning("Zeroconf: DnsServiceRegister() failed with error %u!", ret);
m_request.reset();
m_cancel.reset();
#endif
return false;
}
bool Zeroconf::unregisterService() {
if (!m_ok) {
return false;
}
if (m_helper) {
resetHelper();
return true;
}
#ifdef Q_OS_WIN
if (m_cancel) {
const auto ret = DnsServiceRegisterCancel(m_cancel.get());
if (ret == ERROR_SUCCESS || ret == ERROR_CANCELLED) {
return true;
}
m_cancel.reset();
qWarning("Zeroconf: DnsServiceRegisterCancel() failed with error %u!", ret);
} else if (m_request) {
const auto ret = DnsServiceDeRegister(m_request.get(), nullptr);
if (ret == DNS_REQUEST_PENDING) {
return true;
}
qWarning("Zeroconf: DnsServiceDeRegister() failed with error %u!", ret);
}
#endif
return false;
}
void Zeroconf::helperError(const DNSServiceErrorType error) {
qWarning("Zeroconf: Third-party API reports error %d, service registration probably failed", error);
}
#ifdef Q_OS_WIN
void WINAPI Zeroconf::callbackRegisterComplete(const DWORD status, void *context, DNS_SERVICE_INSTANCE *instance) {
auto zeroconf = static_cast< Zeroconf * >(context);
if (instance) {
zeroconf->DnsServiceFreeInstance(instance);
}
if (status == ERROR_CANCELLED) {
return;
}
zeroconf->m_cancel.reset();
if (status != ERROR_SUCCESS) {
qWarning("Zeroconf: DnsServiceRegister() reports status code %u, service registration probably failed", status);
}
}
#endif
#undef GET_SYMBOL
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