1 /*
2 * Copyright (C) 2020 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 "chpp/services/timesync.h"
18
19 #include <stdbool.h>
20 #include <stddef.h>
21 #include <stdint.h>
22
23 #include "chpp/app.h"
24 #include "chpp/common/timesync.h"
25 #include "chpp/log.h"
26 #include "chpp/macros.h"
27 #include "chpp/services.h"
28 #include "chpp/time.h"
29 #include "chpp/transport.h"
30
31 /**
32 * Processes the GetTime (0x0001) request and responds with the time as on the
33 * service. This should be the same clock used to timestamp any data samples
34 * provided to CHPP.
35 *
36 * @param context Maintains status for each app layer instance.
37 * @param requestHeader Header of the request.
38 */
chppTimesyncGetTime(struct ChppAppState * context,const struct ChppAppHeader * requestHeader)39 static void chppTimesyncGetTime(struct ChppAppState *context,
40 const struct ChppAppHeader *requestHeader) {
41 struct ChppTimesyncResponse *response =
42 chppAllocResponseFixed(requestHeader, struct ChppTimesyncResponse);
43 size_t responseLen = sizeof(*response);
44
45 if (response == NULL) {
46 CHPP_LOG_OOM();
47 CHPP_DEBUG_ASSERT(false);
48 } else {
49 response->timeNs = chppGetCurrentTimeNs();
50 CHPP_LOGD("chppTimesyncGetTime returning %" PRIuSIZE
51 " bytes at time=%" PRIu64,
52 responseLen, response->timeNs / CHPP_NSEC_PER_MSEC);
53
54 chppEnqueueTxDatagramOrFail(context->transportContext, response,
55 responseLen);
56 }
57 }
58
59 /************************************************
60 * Public Functions
61 ***********************************************/
62
chppDispatchTimesyncClientRequest(struct ChppAppState * context,const uint8_t * buf,size_t len)63 bool chppDispatchTimesyncClientRequest(struct ChppAppState *context,
64 const uint8_t *buf, size_t len) {
65 UNUSED_VAR(len);
66 const struct ChppAppHeader *rxHeader = (const struct ChppAppHeader *)buf;
67 bool success = true;
68
69 switch (rxHeader->command) {
70 case CHPP_TIMESYNC_COMMAND_GETTIME: {
71 chppTimesyncGetTime(context, rxHeader);
72 break;
73 }
74 default: {
75 success = false;
76 }
77 }
78 return success;
79 }
80