servicemanager: vintf declared API
servicemanager already has to parse VINTF configurations, so exposing
this functionality here (mirroring hwservicemanager).
Note, this API, like isDeclared is not branded as "VINTF" for future
compatibility with APEX or other interfaces.
Bug: 168715768
Test: manual
Change-Id: Ifbc44677605de757c46ef17f7f29fd83e66a8161
diff --git a/cmds/dumpsys/tests/dumpsys_test.cpp b/cmds/dumpsys/tests/dumpsys_test.cpp
index 3467898..67a77f6 100644
--- a/cmds/dumpsys/tests/dumpsys_test.cpp
+++ b/cmds/dumpsys/tests/dumpsys_test.cpp
@@ -55,6 +55,7 @@
MOCK_METHOD1(listServices, Vector<String16>(int));
MOCK_METHOD1(waitForService, sp<IBinder>(const String16&));
MOCK_METHOD1(isDeclared, bool(const String16&));
+ MOCK_METHOD1(getDeclaredInstances, Vector<String16>(const String16&));
protected:
MOCK_METHOD0(onAsBinder, IBinder*());
};
diff --git a/cmds/servicemanager/ServiceManager.cpp b/cmds/servicemanager/ServiceManager.cpp
index e80c321..c8355e2 100644
--- a/cmds/servicemanager/ServiceManager.cpp
+++ b/cmds/servicemanager/ServiceManager.cpp
@@ -37,6 +37,27 @@
namespace android {
#ifndef VENDORSERVICEMANAGER
+struct ManifestWithDescription {
+ std::shared_ptr<const vintf::HalManifest> manifest;
+ const char* description;
+};
+// func true -> stop search and forEachManifest will return true
+static bool forEachManifest(const std::function<bool(const ManifestWithDescription&)>& func) {
+ for (const ManifestWithDescription& mwd : {
+ ManifestWithDescription{ vintf::VintfObject::GetDeviceHalManifest(), "device" },
+ ManifestWithDescription{ vintf::VintfObject::GetFrameworkHalManifest(), "framework" },
+ }) {
+ if (mwd.manifest == nullptr) {
+ LOG(ERROR) << "NULL VINTF MANIFEST!: " << mwd.description;
+ // note, we explicitly do not retry here, so that we can detect VINTF
+ // or other bugs (b/151696835)
+ continue;
+ }
+ if (func(mwd)) return true;
+ }
+ return false;
+}
+
static bool isVintfDeclared(const std::string& name) {
size_t firstSlash = name.find('/');
size_t lastDot = name.rfind('.', firstSlash);
@@ -49,31 +70,41 @@
const std::string iface = name.substr(lastDot+1, firstSlash-lastDot-1);
const std::string instance = name.substr(firstSlash+1);
- struct ManifestWithDescription {
- std::shared_ptr<const vintf::HalManifest> manifest;
- const char* description;
- };
- for (const ManifestWithDescription& mwd : {
- ManifestWithDescription{ vintf::VintfObject::GetDeviceHalManifest(), "device" },
- ManifestWithDescription{ vintf::VintfObject::GetFrameworkHalManifest(), "framework" },
- }) {
- if (mwd.manifest == nullptr) {
- LOG(ERROR) << "NULL VINTF MANIFEST!: " << mwd.description;
- // note, we explicitly do not retry here, so that we can detect VINTF
- // or other bugs (b/151696835)
- continue;
- }
+ bool found = forEachManifest([&] (const ManifestWithDescription& mwd) {
if (mwd.manifest->hasAidlInstance(package, iface, instance)) {
LOG(INFO) << "Found " << name << " in " << mwd.description << " VINTF manifest.";
return true;
}
+ return false; // continue
+ });
+
+ if (!found) {
+ // Although it is tested, explicitly rebuilding qualified name, in case it
+ // becomes something unexpected.
+ LOG(ERROR) << "Could not find " << package << "." << iface << "/" << instance
+ << " in the VINTF manifest.";
}
- // Although it is tested, explicitly rebuilding qualified name, in case it
- // becomes something unexpected.
- LOG(ERROR) << "Could not find " << package << "." << iface << "/" << instance
- << " in the VINTF manifest.";
- return false;
+ return found;
+}
+
+static std::vector<std::string> getVintfInstances(const std::string& interface) {
+ size_t lastDot = interface.rfind('.');
+ if (lastDot == std::string::npos) {
+ LOG(ERROR) << "VINTF interfaces require names in Java package format (e.g. some.package.foo.IFoo) but got: " << interface;
+ return {};
+ }
+ const std::string package = interface.substr(0, lastDot);
+ const std::string iface = interface.substr(lastDot+1);
+
+ std::vector<std::string> ret;
+ (void)forEachManifest([&](const ManifestWithDescription& mwd) {
+ auto instances = mwd.manifest->getAidlInstances(package, iface);
+ ret.insert(ret.end(), instances.begin(), instances.end());
+ return false; // continue
+ });
+
+ return ret;
}
static bool meetsDeclarationRequirements(const sp<IBinder>& binder, const std::string& name) {
@@ -331,6 +362,30 @@
return Status::ok();
}
+binder::Status ServiceManager::getDeclaredInstances(const std::string& interface, std::vector<std::string>* outReturn) {
+ auto ctx = mAccess->getCallingContext();
+
+ std::vector<std::string> allInstances;
+#ifndef VENDORSERVICEMANAGER
+ allInstances = getVintfInstances(interface);
+#endif
+
+ outReturn->clear();
+
+ for (const std::string& instance : allInstances) {
+ // TODO(b/169275998): allow checking policy only once for the interface
+ if (mAccess->canFind(ctx, interface + "/" + instance)) {
+ outReturn->push_back(instance);
+ }
+ }
+
+ if (outReturn->size() == 0 && allInstances.size() != 0) {
+ return Status::fromExceptionCode(Status::EX_SECURITY);
+ }
+
+ return Status::ok();
+}
+
void ServiceManager::removeRegistrationCallback(const wp<IBinder>& who,
ServiceCallbackMap::iterator* it,
bool* found) {
diff --git a/cmds/servicemanager/ServiceManager.h b/cmds/servicemanager/ServiceManager.h
index a2fc5a8..9f43eb4 100644
--- a/cmds/servicemanager/ServiceManager.h
+++ b/cmds/servicemanager/ServiceManager.h
@@ -44,6 +44,7 @@
const sp<IServiceCallback>& callback) override;
binder::Status isDeclared(const std::string& name, bool* outReturn) override;
+ binder::Status getDeclaredInstances(const std::string& interface, std::vector<std::string>* outReturn) override;
binder::Status registerClientCallback(const std::string& name, const sp<IBinder>& service,
const sp<IClientCallback>& cb) override;
binder::Status tryUnregisterService(const std::string& name, const sp<IBinder>& binder) override;
diff --git a/libs/binder/IServiceManager.cpp b/libs/binder/IServiceManager.cpp
index 9aa82d9..6d728dc 100644
--- a/libs/binder/IServiceManager.cpp
+++ b/libs/binder/IServiceManager.cpp
@@ -74,6 +74,7 @@
Vector<String16> listServices(int dumpsysPriority) override;
sp<IBinder> waitForService(const String16& name16) override;
bool isDeclared(const String16& name) override;
+ Vector<String16> getDeclaredInstances(const String16& interface) override;
// for legacy ABI
const String16& getInterfaceDescriptor() const override {
@@ -373,4 +374,18 @@
return declared;
}
+Vector<String16> ServiceManagerShim::getDeclaredInstances(const String16& interface) {
+ std::vector<std::string> out;
+ if (!mTheRealServiceManager->getDeclaredInstances(String8(interface).c_str(), &out).isOk()) {
+ return {};
+ }
+
+ Vector<String16> res;
+ res.setCapacity(out.size());
+ for (const std::string& instance : out) {
+ res.push(String16(instance.c_str()));
+ }
+ return res;
+}
+
} // namespace android
diff --git a/libs/binder/aidl/android/os/IServiceManager.aidl b/libs/binder/aidl/android/os/IServiceManager.aidl
index ff15460..2b1e492 100644
--- a/libs/binder/aidl/android/os/IServiceManager.aidl
+++ b/libs/binder/aidl/android/os/IServiceManager.aidl
@@ -99,6 +99,14 @@
boolean isDeclared(@utf8InCpp String name);
/**
+ * Returns all declared instances for a particular interface.
+ *
+ * For instance, if 'android.foo.IFoo/foo' is declared, and 'android.foo.IFoo' is
+ * passed here, then ["foo"] would be returned.
+ */
+ @utf8InCpp String[] getDeclaredInstances(@utf8InCpp String iface);
+
+ /**
* Request a callback when the number of clients of the service changes.
* Used by LazyServiceRegistrar to dynamically stop services that have no clients.
*/
diff --git a/libs/binder/include/binder/IServiceManager.h b/libs/binder/include/binder/IServiceManager.h
index 1d520c1..3c5ccc1 100644
--- a/libs/binder/include/binder/IServiceManager.h
+++ b/libs/binder/include/binder/IServiceManager.h
@@ -96,6 +96,11 @@
* service.
*/
virtual bool isDeclared(const String16& name) = 0;
+
+ /**
+ * Get all instances of a service as declared in the VINTF manifest
+ */
+ virtual Vector<String16> getDeclaredInstances(const String16& interface) = 0;
};
sp<IServiceManager> defaultServiceManager();
diff --git a/libs/fakeservicemanager/ServiceManager.cpp b/libs/fakeservicemanager/ServiceManager.cpp
index 6964324..4ecbe53 100644
--- a/libs/fakeservicemanager/ServiceManager.cpp
+++ b/libs/fakeservicemanager/ServiceManager.cpp
@@ -61,4 +61,16 @@
return mNameToService.find(name) != mNameToService.end();
}
+Vector<String16> ServiceManager::getDeclaredInstances(const String16& name) {
+ Vector<String16> out;
+ const String16 prefix = name + String16("/");
+ for (const auto& [registeredName, service] : mNameToService) {
+ (void) service;
+ if (registeredName.startsWith(prefix)) {
+ out.add(String16(registeredName.string() + prefix.size()));
+ }
+ }
+ return out;
+}
+
} // namespace android
diff --git a/libs/fakeservicemanager/ServiceManager.h b/libs/fakeservicemanager/ServiceManager.h
index a6b6b84..4ef47fb 100644
--- a/libs/fakeservicemanager/ServiceManager.h
+++ b/libs/fakeservicemanager/ServiceManager.h
@@ -46,6 +46,8 @@
bool isDeclared(const String16& name) override;
+ Vector<String16> getDeclaredInstances(const String16& iface) override;
+
private:
std::map<String16, sp<IBinder>> mNameToService;
};