132 lines
3.4 KiB
C++
132 lines
3.4 KiB
C++
/*
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* Copyright (C) 2021 The Android Open Sourete 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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#define LOG_TAG "metrics"
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#include <android-base/logging.h>
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#include <fcntl.h>
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#include <poll.h>
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#include <trusty/metrics/metrics.h>
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#include <trusty/metrics/tipc.h>
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#include <trusty/tipc.h>
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#include <unistd.h>
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namespace android {
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namespace trusty {
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namespace metrics {
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using android::base::ErrnoError;
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using android::base::Error;
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Result<void> TrustyMetrics::Open() {
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int fd = tipc_connect(tipc_dev_.c_str(), METRICS_PORT);
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if (fd < 0) {
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return ErrnoError() << "failed to connect to Trusty metrics TA";
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}
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int flags = fcntl(fd, F_GETFL, 0);
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if (flags < 0) {
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return ErrnoError() << "failed F_GETFL";
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}
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int rc = fcntl(fd, F_SETFL, flags | O_NONBLOCK);
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if (rc < 0) {
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return ErrnoError() << "failed F_SETFL";
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}
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metrics_fd_.reset(fd);
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return {};
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}
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Result<void> TrustyMetrics::WaitForEvent(int timeout_ms) {
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if (!metrics_fd_.ok()) {
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return Error() << "connection to Metrics TA has not been initialized yet";
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}
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struct pollfd pfd = {
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.fd = metrics_fd_,
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.events = POLLIN,
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};
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int rc = poll(&pfd, 1, timeout_ms);
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if (rc != 1) {
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return ErrnoError() << "failed poll()";
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}
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if (!(pfd.revents & POLLIN)) {
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return ErrnoError() << "channel not ready";
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}
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return {};
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}
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Result<void> TrustyMetrics::HandleEvent() {
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if (!metrics_fd_.ok()) {
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return Error() << "connection to Metrics TA has not been initialized yet";
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}
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struct metrics_msg metrics_msg;
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int rc = read(metrics_fd_, &metrics_msg, sizeof(metrics_msg));
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if (rc < 0) {
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return ErrnoError() << "failed to read metrics message";
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}
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size_t msg_len = rc;
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if (msg_len < sizeof(metrics_req)) {
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return Error() << "message too small: " << rc;
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}
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uint32_t cmd = metrics_msg.req.cmd;
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uint32_t status = METRICS_NO_ERROR;
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switch (cmd) {
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case METRICS_CMD_REPORT_CRASH: {
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struct metrics_report_crash_req crash_args = metrics_msg.crash_args;
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auto app_id_ptr = crash_args.app_id;
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std::string app_id(app_id_ptr, UUID_STR_SIZE);
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HandleCrash(app_id);
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break;
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}
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case METRICS_CMD_REPORT_EVENT_DROP:
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HandleEventDrop();
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break;
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default:
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status = METRICS_ERR_UNKNOWN_CMD;
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break;
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}
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metrics_resp resp = {
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.cmd = cmd | METRICS_CMD_RESP_BIT,
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.status = status,
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};
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rc = write(metrics_fd_, &resp, sizeof(resp));
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if (rc < 0) {
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return ErrnoError() << "failed to request next metrics event";
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}
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if (rc != (int)sizeof(resp)) {
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return Error() << "unexpected number of bytes sent event: " << rc;
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}
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return {};
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}
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} // namespace metrics
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} // namespace trusty
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} // namespace android
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