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142 lines
4.3 KiB
142 lines
4.3 KiB
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <android-base/logging.h>
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#include <cutils/sockets.h>
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#include <nvram/hal/nvram_device_adapter.h>
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#include <nvram/messages/nvram_messages.h>
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namespace {
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constexpr char kFakeNvramControlSocketName[] = "nvram";
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// This instantiates an |NvramManager| with the storage interface wired up with
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// an in-memory implementation. This *DOES NOT* meet the persistence and tamper
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// evidence requirements of the HAL, but is useful for demonstration and running
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// tests against the |NvramManager| implementation.
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class TestingNvramImplementation : public nvram::NvramImplementation {
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public:
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~TestingNvramImplementation() override;
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void Execute(const nvram::Request& request,
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nvram::Response* response) override;
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private:
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// Connects the fake NVRAM control socket it it is not open already. Returns
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// true if the channel is open, false on errors.
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bool Connect();
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// Sends a request to the fake NVRAM daemon. Returns true if successful, false
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// on any I/O errors.
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bool SendRequest(const nvram::Request& request, nvram::Response* response);
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// A file descriptor of the socket connected to the fake NVRAM daemon.
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int nvram_socket_fd_ = -1;
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// The command buffer, used for encoding request and decoding responses.
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uint8_t command_buffer_[4096];
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};
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TestingNvramImplementation::~TestingNvramImplementation() {
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if (nvram_socket_fd_ != -1) {
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// No need to handle EINTR specially here as bionic filters it out.
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if (close(nvram_socket_fd_)) {
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PLOG(ERROR) << "Failed to close NVRAM command socket";
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}
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nvram_socket_fd_ = -1;
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}
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}
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void TestingNvramImplementation::Execute(const nvram::Request& request,
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nvram::Response* response) {
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if (!SendRequest(request, response)) {
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response->result = NV_RESULT_INTERNAL_ERROR;
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}
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}
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bool TestingNvramImplementation::Connect() {
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if (nvram_socket_fd_ != -1) {
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return true;
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}
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int rc =
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socket_local_client(kFakeNvramControlSocketName,
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ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_SEQPACKET);
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if (rc < 0) {
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PLOG(ERROR) << "Failed to connect fake NVRAM control socket";
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return false;
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}
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nvram_socket_fd_ = rc;
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return true;
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}
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bool TestingNvramImplementation::SendRequest(const nvram::Request& request,
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nvram::Response* response) {
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if (!Connect()) {
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return false;
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}
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size_t request_size = sizeof(command_buffer_);
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if (!nvram::Encode(request, command_buffer_, &request_size)) {
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LOG(ERROR) << "Failed to encode NVRAM request.";
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return false;
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}
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ssize_t rc = TEMP_FAILURE_RETRY(
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write(nvram_socket_fd_, command_buffer_, request_size));
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if (rc < 0) {
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PLOG(ERROR) << "Failed to send request on NVRAM control socket";
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return false;
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}
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rc = TEMP_FAILURE_RETRY(
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read(nvram_socket_fd_, command_buffer_, sizeof(command_buffer_)));
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if (rc < 0 || static_cast<size_t>(rc) > sizeof(command_buffer_)) {
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PLOG(ERROR) << "Failed to read NVRAM response";
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return false;
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}
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if (!nvram::Decode(command_buffer_, static_cast<size_t>(rc), response)) {
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LOG(ERROR) << "Failed to decode NVRAM response.";
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return false;
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}
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return true;
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}
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} // namespace
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extern "C" int testing_nvram_open(const hw_module_t* module,
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const char* device_id,
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hw_device_t** device_ptr) {
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if (strcmp(NVRAM_HARDWARE_DEVICE_ID, device_id) != 0) {
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return -EINVAL;
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}
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nvram::NvramDeviceAdapter* adapter =
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new nvram::NvramDeviceAdapter(module, new TestingNvramImplementation);
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*device_ptr = adapter->as_device();
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return 0;
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}
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