1/*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "chre/platform/shared/host_protocol_chre.h"
18
19#include <inttypes.h>
20#include <string.h>
21
22#include "chre/platform/log.h"
23#include "chre/platform/shared/host_messages_generated.h"
24
25using flatbuffers::FlatBufferBuilder;
26using flatbuffers::Offset;
27using flatbuffers::Vector;
28
29namespace chre {
30
31bool HostProtocolChre::decodeMessageFromHost(const void *message,
32                                             size_t messageLen) {
33  bool success = verifyMessage(message, messageLen);
34  if (!success) {
35    LOGE("Dropping invalid/corrupted message from host (length %zu)",
36         messageLen);
37  } else {
38    const fbs::MessageContainer *container = fbs::GetMessageContainer(message);
39    uint16_t hostClientId = container->host_addr()->client_id();
40
41    switch (container->message_type()) {
42      case fbs::ChreMessage::NanoappMessage: {
43        const auto *nanoappMsg = static_cast<const fbs::NanoappMessage *>(
44            container->message());
45        // Required field; verifier ensures that this is not null (though it
46        // may be empty)
47        const flatbuffers::Vector<uint8_t> *msgData = nanoappMsg->message();
48        HostMessageHandlers::handleNanoappMessage(
49            nanoappMsg->app_id(), nanoappMsg->message_type(),
50            nanoappMsg->host_endpoint(), msgData->data(), msgData->size());
51        break;
52      }
53
54      case fbs::ChreMessage::HubInfoRequest:
55        HostMessageHandlers::handleHubInfoRequest(hostClientId);
56        break;
57
58      case fbs::ChreMessage::NanoappListRequest:
59        HostMessageHandlers::handleNanoappListRequest(hostClientId);
60        break;
61
62      case fbs::ChreMessage::LoadNanoappRequest: {
63        const auto *request = static_cast<const fbs::LoadNanoappRequest *>(
64            container->message());
65        const flatbuffers::Vector<uint8_t> *appBinary = request->app_binary();
66        HostMessageHandlers::handleLoadNanoappRequest(
67            hostClientId, request->transaction_id(), request->app_id(),
68            request->app_version(), request->target_api_version(),
69            appBinary->data(), appBinary->size());
70        break;
71      }
72
73      case fbs::ChreMessage::UnloadNanoappRequest: {
74        const auto *request = static_cast<const fbs::UnloadNanoappRequest *>(
75            container->message());
76        HostMessageHandlers::handleUnloadNanoappRequest(
77            hostClientId, request->transaction_id(), request->app_id(),
78            request->allow_system_nanoapp_unload());
79        break;
80      }
81
82      case fbs::ChreMessage::TimeSyncMessage: {
83        const auto *request = static_cast<const fbs::TimeSyncMessage *>(
84            container->message());
85        HostMessageHandlers::handleTimeSyncMessage(request->offset());
86        break;
87      }
88
89      case fbs::ChreMessage::DebugDumpRequest:
90        HostMessageHandlers::handleDebugDumpRequest(hostClientId);
91        break;
92
93      default:
94        LOGW("Got invalid/unexpected message type %" PRIu8,
95             static_cast<uint8_t>(container->message_type()));
96        success = false;
97    }
98  }
99
100  return success;
101}
102
103void HostProtocolChre::encodeHubInfoResponse(
104    FlatBufferBuilder& builder, const char *name, const char *vendor,
105    const char *toolchain, uint32_t legacyPlatformVersion,
106    uint32_t legacyToolchainVersion, float peakMips, float stoppedPower,
107    float sleepPower, float peakPower, uint32_t maxMessageLen,
108    uint64_t platformId, uint32_t version, uint16_t hostClientId) {
109  auto nameOffset = addStringAsByteVector(builder, name);
110  auto vendorOffset = addStringAsByteVector(builder, vendor);
111  auto toolchainOffset = addStringAsByteVector(builder, toolchain);
112
113  auto response = fbs::CreateHubInfoResponse(
114      builder, nameOffset, vendorOffset, toolchainOffset, legacyPlatformVersion,
115      legacyToolchainVersion, peakMips, stoppedPower, sleepPower, peakPower,
116      maxMessageLen, platformId, version);
117  finalize(builder, fbs::ChreMessage::HubInfoResponse, response.Union(),
118           hostClientId);
119}
120
121void HostProtocolChre::addNanoappListEntry(
122    FlatBufferBuilder& builder,
123    DynamicVector<Offset<fbs::NanoappListEntry>>& offsetVector,
124    uint64_t appId, uint32_t appVersion, bool enabled, bool isSystemNanoapp) {
125  auto offset = fbs::CreateNanoappListEntry(
126      builder, appId, appVersion, enabled, isSystemNanoapp);
127  if (!offsetVector.push_back(offset)) {
128    LOGE("Couldn't push nanoapp list entry offset!");
129  }
130}
131
132void HostProtocolChre::finishNanoappListResponse(
133    FlatBufferBuilder& builder,
134    DynamicVector<Offset<fbs::NanoappListEntry>>& offsetVector,
135    uint16_t hostClientId) {
136  auto vectorOffset = builder.CreateVector<Offset<fbs::NanoappListEntry>>(
137      offsetVector);
138  auto response = fbs::CreateNanoappListResponse(builder, vectorOffset);
139  finalize(builder, fbs::ChreMessage::NanoappListResponse, response.Union(),
140           hostClientId);
141}
142
143void HostProtocolChre::encodeLoadNanoappResponse(
144    flatbuffers::FlatBufferBuilder& builder, uint16_t hostClientId,
145    uint32_t transactionId, bool success) {
146  auto response = fbs::CreateLoadNanoappResponse(builder, transactionId,
147                                                 success);
148  finalize(builder, fbs::ChreMessage::LoadNanoappResponse, response.Union(),
149           hostClientId);
150}
151
152void HostProtocolChre::encodeUnloadNanoappResponse(
153    flatbuffers::FlatBufferBuilder& builder, uint16_t hostClientId,
154    uint32_t transactionId, bool success) {
155  auto response = fbs::CreateUnloadNanoappResponse(builder, transactionId,
156                                                   success);
157  finalize(builder, fbs::ChreMessage::UnloadNanoappResponse, response.Union(),
158           hostClientId);
159}
160
161void HostProtocolChre::encodeLogMessages(
162    flatbuffers::FlatBufferBuilder& builder, const char *logBuffer,
163    size_t bufferSize) {
164  auto logBufferOffset = builder.CreateVector(
165      reinterpret_cast<const int8_t *>(logBuffer), bufferSize);
166  auto message = fbs::CreateLogMessage(builder, logBufferOffset);
167  finalize(builder, fbs::ChreMessage::LogMessage, message.Union());
168}
169
170void HostProtocolChre::encodeDebugDumpData(
171    flatbuffers::FlatBufferBuilder& builder, uint16_t hostClientId,
172    const char *debugStr, size_t debugStrSize) {
173  auto debugStrOffset = builder.CreateVector(
174      reinterpret_cast<const int8_t *>(debugStr), debugStrSize);
175  auto message = fbs::CreateDebugDumpData(builder, debugStrOffset);
176  finalize(builder, fbs::ChreMessage::DebugDumpData, message.Union(),
177           hostClientId);
178}
179
180void HostProtocolChre::encodeDebugDumpResponse(
181      flatbuffers::FlatBufferBuilder& builder, uint16_t hostClientId,
182      bool success, uint32_t dataCount) {
183  auto response = fbs::CreateDebugDumpResponse(builder, success, dataCount);
184  finalize(builder, fbs::ChreMessage::DebugDumpResponse, response.Union(),
185           hostClientId);
186}
187
188void HostProtocolChre::encodeTimeSyncRequest(
189    flatbuffers::FlatBufferBuilder& builder) {
190  auto request = fbs::CreateTimeSyncRequest(builder);
191  finalize(builder, fbs::ChreMessage::TimeSyncRequest, request.Union());
192}
193
194}  // namespace chre
195