| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * 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 "MDnsSdListener.h" |
| |
| #include <arpa/inet.h> |
| #include <dirent.h> |
| #include <errno.h> |
| #include <inttypes.h> |
| #include <linux/if.h> |
| #include <netdb.h> |
| #include <netinet/in.h> |
| #include <pthread.h> |
| #include <resolv.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/poll.h> |
| #include <sys/socket.h> |
| #include <sys/types.h> |
| |
| #define LOG_TAG "MDnsDS" |
| #define DBG 1 |
| #define VDBG 1 |
| |
| #include <cutils/properties.h> |
| #include <log/log.h> |
| #include <netdutils/ThreadUtil.h> |
| #include <sysutils/SocketClient.h> |
| |
| #include "Controllers.h" |
| #include "MDnsEventReporter.h" |
| #include "netid_client.h" |
| |
| using android::net::gCtls; |
| |
| #define MDNS_SERVICE_NAME "mdnsd" |
| #define MDNS_SERVICE_STATUS "init.svc.mdnsd" |
| |
| #define CEIL(x, y) (((x) + (y) - 1) / (y)) |
| |
| constexpr char RESCAN[] = "1"; |
| |
| using android::net::mdns::aidl::DiscoveryInfo; |
| using android::net::mdns::aidl::GetAddressInfo; |
| using android::net::mdns::aidl::IMDnsEventListener; |
| using android::net::mdns::aidl::RegistrationInfo; |
| using android::net::mdns::aidl::ResolutionInfo; |
| |
| static unsigned ifaceIndexToNetId(uint32_t interfaceIndex) { |
| char interfaceName[IFNAMSIZ] = {}; |
| unsigned netId; |
| if (if_indextoname(interfaceIndex, interfaceName) == nullptr) { |
| ALOGE("Interface %d was not found", interfaceIndex); |
| return NETID_UNSET; |
| } else if ((netId = gCtls->netCtrl.getNetworkForInterface(interfaceName)) == NETID_UNSET) { |
| ALOGE("Network was not found for interface %s", interfaceName); |
| return NETID_UNSET; |
| } |
| return netId; |
| } |
| |
| int MDnsSdListener::discover(uint32_t ifIndex, const char* regType, const char* domain, |
| const int requestId, const int requestFlags) { |
| if (VDBG) { |
| ALOGD("discover(%d, %s, %s, %d, %d)", ifIndex, regType, domain ? domain : "null", requestId, |
| requestFlags); |
| } |
| Context* context = new Context(requestId); |
| DNSServiceRef* ref = mMonitor.allocateServiceRef(requestId, context); |
| if (ref == nullptr) { |
| ALOGE("requestId %d already in use during discover call", requestId); |
| return -EBUSY; |
| } |
| if (VDBG) ALOGD("using ref %p", ref); |
| |
| DNSServiceErrorType result = DNSServiceBrowse(ref, requestFlags, ifIndex, regType, domain, |
| &MDnsSdListenerDiscoverCallback, context); |
| if (result != kDNSServiceErr_NoError) { |
| ALOGE("Discover request %d got an error from DNSServiceBrowse %d", requestId, result); |
| mMonitor.freeServiceRef(requestId); |
| // Return kDNSServiceErr_* directly instead of transferring to an UNIX error. |
| // This can help caller to know what going wrong from mdnsresponder side. |
| return -result; |
| } |
| mMonitor.startMonitoring(requestId); |
| if (VDBG) ALOGD("discover successful"); |
| return 0; |
| } |
| |
| void MDnsSdListenerDiscoverCallback(DNSServiceRef /* sdRef */, DNSServiceFlags flags, |
| uint32_t ifIndex, DNSServiceErrorType errorCode, |
| const char* serviceName, const char* regType, |
| const char* replyDomain, void* inContext) { |
| MDnsSdListener::Context *context = reinterpret_cast<MDnsSdListener::Context *>(inContext); |
| int refNumber = context->mRefNumber; |
| const std::lock_guard lock(MDnsEventReporter::getInstance().mMutex); |
| const auto& listeners = MDnsEventReporter::getInstance().getEventListeners(); |
| if (listeners.empty()) { |
| ALOGI("Discover callback not sent since no IMDnsEventListener receiver is available."); |
| return; |
| } |
| |
| DiscoveryInfo info; |
| info.id = refNumber; |
| info.serviceName = serviceName; |
| info.registrationType = regType; |
| info.interfaceIdx = ifIndex; |
| // If the network is not found, still send the event and let |
| // the service decide what to do with a callback with an empty network |
| info.netId = ifaceIndexToNetId(ifIndex); |
| if (errorCode == kDNSServiceErr_NoError) { |
| if (flags & kDNSServiceFlagsAdd) { |
| if (VDBG) { |
| ALOGD("Discover found new serviceName %s, regType %s and domain %s for %d", |
| serviceName, regType, replyDomain, refNumber); |
| } |
| info.result = IMDnsEventListener::SERVICE_FOUND; |
| } else { |
| if (VDBG) { |
| ALOGD("Discover lost serviceName %s, regType %s and domain %s for %d", serviceName, |
| regType, replyDomain, refNumber); |
| } |
| info.result = IMDnsEventListener::SERVICE_LOST; |
| } |
| } else { |
| if (DBG) ALOGE("discover failure for %d, error= %d", refNumber, errorCode); |
| info.result = IMDnsEventListener::SERVICE_DISCOVERY_FAILED; |
| } |
| |
| for (const auto& it : listeners) { |
| it->getListener()->onServiceDiscoveryStatus(info); |
| } |
| } |
| |
| int MDnsSdListener::stop(int requestId) { |
| DNSServiceRef* ref = mMonitor.lookupServiceRef(requestId); |
| if (ref == nullptr) { |
| if (DBG) ALOGE("Stop used unknown requestId %d", requestId); |
| return -ESRCH; |
| } |
| if (VDBG) ALOGD("Stopping operation with ref %p", ref); |
| mMonitor.deallocateServiceRef(ref); |
| mMonitor.freeServiceRef(requestId); |
| return 0; |
| } |
| |
| int MDnsSdListener::serviceRegister(int requestId, const char* serviceName, const char* serviceType, |
| const char* domain, const char* host, int port, |
| const std::vector<unsigned char>& txtRecord, uint32_t ifIndex) { |
| if (VDBG) { |
| ALOGD("serviceRegister(%d, %d, %s, %s, %s, %s, %d, <binary>)", requestId, ifIndex, |
| serviceName, serviceType, domain ? domain : "null", host ? host : "null", port); |
| } |
| Context* context = new Context(requestId); |
| DNSServiceRef* ref = mMonitor.allocateServiceRef(requestId, context); |
| if (ref == nullptr) { |
| ALOGE("requestId %d already in use during register call", requestId); |
| return -EBUSY; |
| } |
| port = htons(port); |
| DNSServiceFlags nativeFlags = 0; |
| DNSServiceErrorType result = DNSServiceRegister( |
| ref, nativeFlags, ifIndex, serviceName, serviceType, domain, host, port, |
| txtRecord.size(), &txtRecord.front(), &MDnsSdListenerRegisterCallback, context); |
| if (result != kDNSServiceErr_NoError) { |
| ALOGE("service register request %d got an error from DNSServiceRegister %d", requestId, |
| result); |
| mMonitor.freeServiceRef(requestId); |
| // Return kDNSServiceErr_* directly instead of transferring to an UNIX error. |
| // This can help caller to know what going wrong from mdnsresponder side. |
| return -result; |
| } |
| mMonitor.startMonitoring(requestId); |
| if (VDBG) ALOGD("serviceRegister successful"); |
| return 0; |
| } |
| |
| void MDnsSdListenerRegisterCallback(DNSServiceRef /* sdRef */, DNSServiceFlags /* flags */, |
| DNSServiceErrorType errorCode, const char* serviceName, |
| const char* regType, const char* /* domain */, |
| void* inContext) { |
| MDnsSdListener::Context* context = reinterpret_cast<MDnsSdListener::Context*>(inContext); |
| int refNumber = context->mRefNumber; |
| const std::lock_guard lock(MDnsEventReporter::getInstance().mMutex); |
| const auto& listeners = MDnsEventReporter::getInstance().getEventListeners(); |
| if (listeners.empty()) { |
| ALOGI("Register callback not sent since no IMDnsEventListener receiver is available."); |
| return; |
| } |
| |
| RegistrationInfo info; |
| info.id = refNumber; |
| info.serviceName = serviceName; |
| info.registrationType = regType; |
| if (errorCode == kDNSServiceErr_NoError) { |
| if (VDBG) ALOGD("register succeeded for %d as %s", refNumber, serviceName); |
| info.result = IMDnsEventListener::SERVICE_REGISTERED; |
| } else { |
| if (DBG) ALOGE("register failure for %d, error= %d", refNumber, errorCode); |
| info.result = IMDnsEventListener::SERVICE_REGISTRATION_FAILED; |
| } |
| |
| for (const auto& it : listeners) { |
| it->getListener()->onServiceRegistrationStatus(info); |
| } |
| } |
| |
| int MDnsSdListener::resolveService(int requestId, uint32_t ifIndex, const char* serviceName, |
| const char* regType, const char* domain) { |
| if (VDBG) { |
| ALOGD("resolveService(%d, %d, %s, %s, %s)", requestId, ifIndex, serviceName, regType, |
| domain); |
| } |
| Context* context = new Context(requestId); |
| DNSServiceRef* ref = mMonitor.allocateServiceRef(requestId, context); |
| if (ref == nullptr) { |
| ALOGE("request Id %d already in use during resolve call", requestId); |
| return -EBUSY; |
| } |
| DNSServiceFlags nativeFlags = 0; |
| DNSServiceErrorType result = DNSServiceResolve(ref, nativeFlags, ifIndex, serviceName, regType, |
| domain, &MDnsSdListenerResolveCallback, context); |
| if (result != kDNSServiceErr_NoError) { |
| ALOGE("service resolve request %d on iface %d: got an error from DNSServiceResolve %d", |
| requestId, ifIndex, result); |
| mMonitor.freeServiceRef(requestId); |
| // Return kDNSServiceErr_* directly instead of transferring to an UNIX error. |
| // This can help caller to know what going wrong from mdnsresponder side. |
| return -result; |
| } |
| mMonitor.startMonitoring(requestId); |
| if (VDBG) ALOGD("resolveService successful"); |
| return 0; |
| } |
| |
| void MDnsSdListenerResolveCallback(DNSServiceRef /* sdRef */, DNSServiceFlags /* flags */, |
| uint32_t ifIndex, DNSServiceErrorType errorCode, |
| const char* fullname, const char* hosttarget, uint16_t port, |
| uint16_t txtLen, const unsigned char* txtRecord, |
| void* inContext) { |
| MDnsSdListener::Context* context = reinterpret_cast<MDnsSdListener::Context*>(inContext); |
| int refNumber = context->mRefNumber; |
| const std::lock_guard lock(MDnsEventReporter::getInstance().mMutex); |
| const auto& listeners = MDnsEventReporter::getInstance().getEventListeners(); |
| if (listeners.empty()) { |
| ALOGI("Resolve callback not sent since no IMDnsEventListener receiver is available."); |
| return; |
| } |
| port = ntohs(port); |
| |
| ResolutionInfo info; |
| info.id = refNumber; |
| info.port = port; |
| info.serviceFullName = fullname; |
| info.hostname = hosttarget; |
| info.txtRecord = std::vector<unsigned char>(txtRecord, txtRecord + txtLen); |
| info.interfaceIdx = ifIndex; |
| if (errorCode == kDNSServiceErr_NoError) { |
| if (VDBG) { |
| ALOGD("resolve succeeded for %d finding %s at %s:%d with txtLen %d", refNumber, |
| fullname, hosttarget, port, txtLen); |
| } |
| info.result = IMDnsEventListener::SERVICE_RESOLVED; |
| } else { |
| if (DBG) ALOGE("resolve failure for %d, error= %d", refNumber, errorCode); |
| info.result = IMDnsEventListener::SERVICE_RESOLUTION_FAILED; |
| } |
| |
| for (const auto& it : listeners) { |
| it->getListener()->onServiceResolutionStatus(info); |
| } |
| } |
| |
| int MDnsSdListener::getAddrInfo(int requestId, uint32_t ifIndex, uint32_t protocol, |
| const char* hostname) { |
| if (VDBG) ALOGD("getAddrInfo(%d, %u %d, %s)", requestId, ifIndex, protocol, hostname); |
| Context* context = new Context(requestId); |
| DNSServiceRef* ref = mMonitor.allocateServiceRef(requestId, context); |
| if (ref == nullptr) { |
| ALOGE("request ID %d already in use during getAddrInfo call", requestId); |
| return -EBUSY; |
| } |
| DNSServiceFlags nativeFlags = 0; |
| DNSServiceErrorType result = |
| DNSServiceGetAddrInfo(ref, nativeFlags, ifIndex, protocol, hostname, |
| &MDnsSdListenerGetAddrInfoCallback, context); |
| if (result != kDNSServiceErr_NoError) { |
| ALOGE("getAddrInfo request %d got an error from DNSServiceGetAddrInfo %d", requestId, |
| result); |
| mMonitor.freeServiceRef(requestId); |
| // Return kDNSServiceErr_* directly instead of transferring to an UNIX error. |
| // This can help caller to know what going wrong from mdnsresponder side. |
| return -result; |
| } |
| mMonitor.startMonitoring(requestId); |
| if (VDBG) ALOGD("getAddrInfo successful"); |
| return 0; |
| } |
| |
| void MDnsSdListenerGetAddrInfoCallback(DNSServiceRef /* sdRef */, DNSServiceFlags /* flags */, |
| uint32_t ifIndex, DNSServiceErrorType errorCode, |
| const char* hostname, const struct sockaddr* const sa, |
| uint32_t /* ttl */, void* inContext) { |
| MDnsSdListener::Context *context = reinterpret_cast<MDnsSdListener::Context *>(inContext); |
| int refNumber = context->mRefNumber; |
| const std::lock_guard lock(MDnsEventReporter::getInstance().mMutex); |
| const auto& listeners = MDnsEventReporter::getInstance().getEventListeners(); |
| if (listeners.empty()) { |
| ALOGI("Get address callback not sent since no IMDnsEventListener receiver is available."); |
| return; |
| } |
| |
| GetAddressInfo info; |
| info.id = refNumber; |
| info.hostname = hostname; |
| info.interfaceIdx = ifIndex; |
| // If the network is not found, still send the event with an empty network |
| // and let the service decide what to do with it |
| info.netId = ifaceIndexToNetId(ifIndex); |
| if (errorCode == kDNSServiceErr_NoError) { |
| char addr[INET6_ADDRSTRLEN]; |
| if (sa->sa_family == AF_INET) { |
| inet_ntop(sa->sa_family, &(((struct sockaddr_in *)sa)->sin_addr), addr, sizeof(addr)); |
| } else { |
| inet_ntop(sa->sa_family, &(((struct sockaddr_in6 *)sa)->sin6_addr), addr, sizeof(addr)); |
| } |
| info.address = addr; |
| if (VDBG) { |
| ALOGD("getAddrInfo succeeded for %d:", refNumber); |
| } |
| info.result = IMDnsEventListener::SERVICE_GET_ADDR_SUCCESS; |
| } else { |
| if (DBG) ALOGE("getAddrInfo failure for %d, error= %d", refNumber, errorCode); |
| info.result = IMDnsEventListener::SERVICE_GET_ADDR_FAILED; |
| } |
| for (const auto& it : listeners) { |
| it->getListener()->onGettingServiceAddressStatus(info); |
| } |
| } |
| |
| int MDnsSdListener::startDaemon() { |
| if (!mMonitor.startService()) { |
| ALOGE("Failed to start: Service already running"); |
| return -EBUSY; |
| } |
| return 0; |
| } |
| |
| int MDnsSdListener::stopDaemon() { |
| if (!mMonitor.stopService()) { |
| ALOGE("Failed to stop: Service still in use"); |
| return -EBUSY; |
| } |
| return 0; |
| } |
| |
| MDnsSdListener::Monitor::Monitor() { |
| mHead = nullptr; |
| mLiveCount = 0; |
| mPollFds = nullptr; |
| mPollRefs = nullptr; |
| mPollSize = 10; |
| socketpair(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, mCtrlSocketPair); |
| |
| const int rval = ::android::netdutils::threadLaunch(this); |
| if (rval != 0) { |
| ALOGW("Error spawning monitor thread: %s (%d)", strerror(-rval), -rval); |
| } |
| } |
| |
| #define NAP_TIME 200 // 200 ms between polls |
| static int wait_for_property(const char *name, const char *desired_value, int maxwait) |
| { |
| char value[PROPERTY_VALUE_MAX] = {'\0'}; |
| int maxnaps = (maxwait * 1000) / NAP_TIME; |
| |
| if (maxnaps < 1) { |
| maxnaps = 1; |
| } |
| |
| while (maxnaps-- > 0) { |
| usleep(NAP_TIME * 1000); |
| if (property_get(name, value, nullptr)) { |
| if (desired_value == nullptr || strcmp(value, desired_value) == 0) { |
| return 0; |
| } |
| } |
| } |
| return -1; /* failure */ |
| } |
| |
| int MDnsSdListener::Monitor::startService() { |
| char property_value[PROPERTY_VALUE_MAX]; |
| std::lock_guard guard(mMutex); |
| property_get(MDNS_SERVICE_STATUS, property_value, ""); |
| if (strcmp("running", property_value) != 0) { |
| ALOGD("Starting MDNSD"); |
| property_set("ctl.start", MDNS_SERVICE_NAME); |
| wait_for_property(MDNS_SERVICE_STATUS, "running", 5); |
| return -1; |
| } |
| return 0; |
| } |
| |
| int MDnsSdListener::Monitor::stopService() { |
| std::lock_guard guard(mMutex); |
| if (mHead == nullptr) { |
| ALOGD("Stopping MDNSD"); |
| property_set("ctl.stop", MDNS_SERVICE_NAME); |
| wait_for_property(MDNS_SERVICE_STATUS, "stopped", 5); |
| return -1; |
| } |
| return 0; |
| } |
| |
| void MDnsSdListener::Monitor::run() { |
| int pollCount = 1; |
| |
| mPollFds = (struct pollfd *)calloc(sizeof(struct pollfd), mPollSize); |
| mPollRefs = (DNSServiceRef **)calloc(sizeof(DNSServiceRef *), mPollSize); |
| LOG_ALWAYS_FATAL_IF((mPollFds == nullptr), "initial calloc failed on mPollFds with a size of %d", |
| ((int)sizeof(struct pollfd)) * mPollSize); |
| LOG_ALWAYS_FATAL_IF((mPollRefs == nullptr), "initial calloc failed on mPollRefs with a size of %d", |
| ((int)sizeof(DNSServiceRef *)) * mPollSize); |
| |
| mPollFds[0].fd = mCtrlSocketPair[0]; |
| mPollFds[0].events = POLLIN; |
| |
| if (VDBG) ALOGD("MDnsSdListener starting to monitor"); |
| while (1) { |
| if (VDBG) ALOGD("Going to poll with pollCount %d", pollCount); |
| int pollResults = poll(mPollFds, pollCount, 10000000); |
| if (VDBG) ALOGD("pollResults=%d", pollResults); |
| if (pollResults < 0) { |
| ALOGE("Error in poll - got %d", errno); |
| } else if (pollResults > 0) { |
| if (VDBG) ALOGD("Monitor poll got data pollCount = %d, %d", pollCount, pollResults); |
| for(int i = 1; i < pollCount; i++) { |
| if (mPollFds[i].revents != 0) { |
| if (VDBG) { |
| ALOGD("Monitor found [%d].revents = %d - calling ProcessResults", |
| i, mPollFds[i].revents); |
| } |
| std::lock_guard guard(mMutex); |
| DNSServiceProcessResult(*(mPollRefs[i])); |
| mPollFds[i].revents = 0; |
| } |
| } |
| if (VDBG) ALOGD("controlSocket shows revent= %d", mPollFds[0].revents); |
| switch (mPollFds[0].revents) { |
| case POLLIN: { |
| char readBuf[2]; |
| read(mCtrlSocketPair[0], &readBuf, 1); |
| if (DBG) ALOGD("MDnsSdListener::Monitor got %c", readBuf[0]); |
| if (memcmp(RESCAN, readBuf, 1) == 0) { |
| pollCount = rescan(); |
| } |
| } |
| } |
| mPollFds[0].revents = 0; |
| } else { |
| if (VDBG) ALOGD("MDnsSdListener::Monitor poll timed out"); |
| } |
| } |
| free(mPollFds); |
| free(mPollRefs); |
| } |
| |
| #define DBG_RESCAN 0 |
| |
| int MDnsSdListener::Monitor::rescan() { |
| // rescan the list from mHead and make new pollfds and serviceRefs |
| if (VDBG) { |
| ALOGD("MDnsSdListener::Monitor poll rescanning - size=%d, live=%d", mPollSize, mLiveCount); |
| } |
| std::lock_guard guard(mMutex); |
| Element **prevPtr = &mHead; |
| int i = 1; |
| if (mPollSize <= mLiveCount) { |
| mPollSize = mLiveCount + 5; |
| free(mPollFds); |
| free(mPollRefs); |
| mPollFds = (struct pollfd *)calloc(sizeof(struct pollfd), mPollSize); |
| mPollRefs = (DNSServiceRef **)calloc(sizeof(DNSServiceRef *), mPollSize); |
| LOG_ALWAYS_FATAL_IF((mPollFds == nullptr), "calloc failed on mPollFds with a size of %d", |
| ((int)sizeof(struct pollfd)) * mPollSize); |
| LOG_ALWAYS_FATAL_IF((mPollRefs == nullptr), "calloc failed on mPollRefs with a size of %d", |
| ((int)sizeof(DNSServiceRef *)) * mPollSize); |
| } else { |
| memset(mPollFds, 0, sizeof(struct pollfd) * mPollSize); |
| memset(mPollRefs, 0, sizeof(DNSServiceRef *) * mPollSize); |
| } |
| mPollFds[0].fd = mCtrlSocketPair[0]; |
| mPollFds[0].events = POLLIN; |
| if (DBG_RESCAN) ALOGD("mHead = %p", mHead); |
| while (*prevPtr != nullptr) { |
| if (DBG_RESCAN) ALOGD("checking %p, mReady = %d", *prevPtr, (*prevPtr)->mReady); |
| if ((*prevPtr)->mReady == 1) { |
| int fd = DNSServiceRefSockFD((*prevPtr)->mRef); |
| if (fd != -1) { |
| if (DBG_RESCAN) ALOGD(" adding FD %d", fd); |
| mPollFds[i].fd = fd; |
| mPollFds[i].events = POLLIN; |
| mPollRefs[i] = &((*prevPtr)->mRef); |
| i++; |
| } else { |
| ALOGE("Error retreving socket FD for live ServiceRef"); |
| } |
| prevPtr = &((*prevPtr)->mNext); // advance to the next element |
| } else if ((*prevPtr)->mReady == -1) { |
| if (DBG_RESCAN) ALOGD(" removing %p from play", *prevPtr); |
| Element *cur = *prevPtr; |
| *prevPtr = (cur)->mNext; // change our notion of this element and don't advance |
| delete cur; |
| } else if ((*prevPtr)->mReady == 0) { |
| // Not ready so just skip this node and continue on |
| if (DBG_RESCAN) ALOGD("%p not ready. Continuing.", *prevPtr); |
| prevPtr = &((*prevPtr)->mNext); |
| } |
| } |
| |
| return i; |
| } |
| |
| DNSServiceRef *MDnsSdListener::Monitor::allocateServiceRef(int id, Context *context) { |
| if (lookupServiceRef(id) != nullptr) { |
| delete(context); |
| return nullptr; |
| } |
| Element *e = new Element(id, context); |
| std::lock_guard guard(mMutex); |
| e->mNext = mHead; |
| mHead = e; |
| return &(e->mRef); |
| } |
| |
| DNSServiceRef *MDnsSdListener::Monitor::lookupServiceRef(int id) { |
| std::lock_guard guard(mMutex); |
| Element *cur = mHead; |
| while (cur != nullptr) { |
| if (cur->mId == id) { |
| DNSServiceRef *result = &(cur->mRef); |
| return result; |
| } |
| cur = cur->mNext; |
| } |
| return nullptr; |
| } |
| |
| void MDnsSdListener::Monitor::startMonitoring(int id) { |
| if (VDBG) ALOGD("startMonitoring %d", id); |
| std::lock_guard guard(mMutex); |
| for (Element* cur = mHead; cur != nullptr; cur = cur->mNext) { |
| if (cur->mId == id) { |
| if (DBG_RESCAN) ALOGD("marking %p as ready to be added", cur); |
| mLiveCount++; |
| cur->mReady = 1; |
| write(mCtrlSocketPair[1], RESCAN, 1); // trigger a rescan for a fresh poll |
| if (VDBG) ALOGD("triggering rescan"); |
| return; |
| } |
| } |
| } |
| |
| void MDnsSdListener::Monitor::freeServiceRef(int id) { |
| if (VDBG) ALOGD("freeServiceRef %d", id); |
| std::lock_guard guard(mMutex); |
| Element* cur; |
| for (Element** prevPtr = &mHead; *prevPtr != nullptr; prevPtr = &(cur->mNext)) { |
| cur = *prevPtr; |
| if (cur->mId == id) { |
| if (DBG_RESCAN) ALOGD("marking %p as ready to be removed", cur); |
| mLiveCount--; |
| if (cur->mReady == 1) { |
| cur->mReady = -1; // tell poll thread to delete |
| cur->mRef = nullptr; // do not process further results |
| write(mCtrlSocketPair[1], RESCAN, 1); // trigger a rescan for a fresh poll |
| if (VDBG) ALOGD("triggering rescan"); |
| } else { |
| *prevPtr = cur->mNext; |
| delete cur; |
| } |
| return; |
| } |
| } |
| } |
| |
| void MDnsSdListener::Monitor::deallocateServiceRef(DNSServiceRef* ref) { |
| std::lock_guard guard(mMutex); |
| DNSServiceRefDeallocate(*ref); |
| *ref = nullptr; |
| } |
