1 /*
2 * Copyright (C) 2022 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/util/pigweed/rpc_helper.h"
18
19 #include <cinttypes>
20
21 #include "chre/util/nanoapp/log.h"
22
23 #ifndef LOG_TAG
24 #define LOG_TAG "[RpcHelper]"
25 #endif // LOG_TAG
26
27 namespace chre {
28
rpcEndpointsMatch(uint32_t expectedId,uint32_t actualId)29 bool rpcEndpointsMatch(uint32_t expectedId, uint32_t actualId) {
30 if ((expectedId & kRpcClientIdMask) != (actualId & kRpcClientIdMask)) {
31 LOGE("Invalid endpoint 0x%04" PRIx32 " expected 0x%04" PRIx32, actualId,
32 expectedId);
33 return false;
34 }
35
36 return true;
37 }
38
isRpcChannelIdHost(uint32_t id)39 bool isRpcChannelIdHost(uint32_t id) {
40 return id >> 16 == 1;
41 }
42
isRpcChannelIdNanoapp(uint32_t id)43 bool isRpcChannelIdNanoapp(uint32_t id) {
44 return id >> 16 == 0;
45 }
46
validateHostChannelId(const chreMessageFromHostData * msg,uint32_t channelId)47 bool validateHostChannelId(const chreMessageFromHostData *msg,
48 uint32_t channelId) {
49 struct chreHostEndpointInfo info;
50
51 if (!isRpcChannelIdHost(channelId) ||
52 !chreGetHostEndpointInfo(msg->hostEndpoint, &info)) {
53 LOGE("Invalid channelId for a host client 0x%08" PRIx32, channelId);
54 return false;
55 }
56
57 return rpcEndpointsMatch(channelId, static_cast<uint32_t>(msg->hostEndpoint));
58 }
59
validateNanoappChannelId(uint32_t nappId,uint32_t channelId)60 bool validateNanoappChannelId(uint32_t nappId, uint32_t channelId) {
61 if (nappId > kRpcNanoappMaxId) {
62 LOGE("Invalid nanoapp Id 0x%08" PRIx32, nappId);
63 return false;
64 }
65
66 if (!isRpcChannelIdNanoapp(channelId)) {
67 LOGE("Invalid channelId for a nanoapp 0x%08" PRIx32, channelId);
68 return false;
69 }
70
71 return rpcEndpointsMatch(channelId, nappId);
72 }
73
74 } // namespace chre