Gatekeeperd maintenance

* Move gatekeeper aidl definition to system/core/gatekeeperd
  * Retire hand written IGateKeeperService and use generated instead
  * Adjust gatekeeperd to use the generated aidl stubs.
  * Annotated enroll parameters with @nullable to match the
    documentation and the way it was used. (The hand written
    code was tolerant to null parameters, but it was undefined behavior.)
* Removed Software implementation from gatekeeperd.
  * Also removed the upgrade path.
  * Software implementation including test moved to
    hardware/interfaces/gatekeeper/1.0/software

Change-Id: I72b734db6f67b79b29c2629764490d75d179908a
Test: Manually tested setting pin and login.

gatekeeperd/Android.bp

@@ -23,8 +23,6 @@ cc_binary {
         "-Wunused",
     ],
     srcs: [
-        "SoftGateKeeperDevice.cpp",
-        "IGateKeeperService.cpp",
         "gatekeeperd.cpp",
     ],
 
@@ -43,9 +41,44 @@ cc_binary {
         "libhidltransport",
         "libhwbinder",
         "[email protected]",
+        "libgatekeeper_aidl",
     ],
 
     static_libs: ["libscrypt_static"],
     include_dirs: ["external/scrypt/lib/crypto"],
     init_rc: ["gatekeeperd.rc"],
 }
+
+filegroup {
+    name: "gatekeeper_aidl",
+    srcs: [
+        "binder/android/service/gatekeeper/IGateKeeperService.aidl",
+    ],
+    path: "binder",
+}
+
+cc_library_shared {
+    name: "libgatekeeper_aidl",
+    srcs: [
+        ":gatekeeper_aidl",
+        "GateKeeperResponse.cpp",
+    ],
+    aidl: {
+        export_aidl_headers: true,
+        include_dirs: [
+            "system/core/gatekeeperd/binder",
+            "frameworks/base/core/java/",
+        ],
+    },
+    export_include_dirs: ["include"],
+    shared_libs: [
+        "libbase",
+        "libbinder",
+        "libcutils",
+        "liblog",
+        "libutils",
+    ],
+    export_shared_lib_headers: [
+        "libbinder",
+    ],
+}

gatekeeperd/GateKeeperResponse.cpp

@@ -0,0 +1,83 @@
+/*
+**
+** Copyright 2019, 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.
+*/
+
+#define LOG_TAG "gatekeeperd"
+
+#include <gatekeeper/GateKeeperResponse.h>
+
+#include <binder/Parcel.h>
+
+#include <android-base/logging.h>
+
+namespace android {
+namespace service {
+namespace gatekeeper {
+
+status_t GateKeeperResponse::readFromParcel(const Parcel* in) {
+    if (in == nullptr) {
+        LOG(ERROR) << "readFromParcel got null in parameter";
+        return BAD_VALUE;
+    }
+    timeout_ = 0;
+    should_reenroll_ = false;
+    payload_ = {};
+    response_code_ = ResponseCode(in->readInt32());
+    if (response_code_ == ResponseCode::OK) {
+        should_reenroll_ = in->readInt32();
+        ssize_t length = in->readInt32();
+        if (length > 0) {
+            length = in->readInt32();
+            const uint8_t* buf = reinterpret_cast<const uint8_t*>(in->readInplace(length));
+            if (buf == nullptr) {
+                LOG(ERROR) << "readInplace returned null buffer for length " << length;
+                return BAD_VALUE;
+            }
+            payload_.resize(length);
+            std::copy(buf, buf + length, payload_.data());
+        }
+    } else if (response_code_ == ResponseCode::RETRY) {
+        timeout_ = in->readInt32();
+    }
+    return NO_ERROR;
+}
+status_t GateKeeperResponse::writeToParcel(Parcel* out) const {
+    if (out == nullptr) {
+        LOG(ERROR) << "writeToParcel got null out parameter";
+        return BAD_VALUE;
+    }
+    out->writeInt32(int32_t(response_code_));
+    if (response_code_ == ResponseCode::OK) {
+        out->writeInt32(should_reenroll_);
+        out->writeInt32(payload_.size());
+        if (payload_.size() != 0) {
+            out->writeInt32(payload_.size());
+            uint8_t* buf = reinterpret_cast<uint8_t*>(out->writeInplace(payload_.size()));
+            if (buf == nullptr) {
+                LOG(ERROR) << "writeInplace returned null buffer for length " << payload_.size();
+                return BAD_VALUE;
+            }
+            std::copy(payload_.begin(), payload_.end(), buf);
+        }
+    } else if (response_code_ == ResponseCode::RETRY) {
+        out->writeInt32(timeout_);
+    }
+    return NO_ERROR;
+}
+
+}  // namespace gatekeeper
+}  // namespace service
+}  // namespace android