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100 lines
3.1 KiB
100 lines
3.1 KiB
/*
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* Copyright (C) 2020 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 "chpp/services/discovery.h"
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include "chpp/app.h"
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#include "chpp/common/discovery.h"
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#include "chpp/log.h"
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#include "chpp/macros.h"
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#include "chpp/services.h"
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#include "chpp/transport.h"
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/************************************************
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* Prototypes
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***********************************************/
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static void chppDiscoveryDiscoverAll(struct ChppAppState *context,
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const struct ChppAppHeader *rxHeader);
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/************************************************
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* Private Functions
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***********************************************/
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/**
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* Processes the Discover All Services (0x0001) request.
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*
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* @param context Maintains status for each app layer instance.
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* @param requestHeader Request datagram header. Cannot be null.
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*/
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static void chppDiscoveryDiscoverAll(
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struct ChppAppState *context, const struct ChppAppHeader *requestHeader) {
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// Allocate response
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size_t responseLen =
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sizeof(struct ChppAppHeader) +
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context->registeredServiceCount * sizeof(struct ChppServiceDescriptor);
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struct ChppDiscoveryResponse *response = chppAllocServiceResponseTypedArray(
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requestHeader, struct ChppDiscoveryResponse,
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context->registeredServiceCount, services);
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if (response == NULL) {
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CHPP_LOG_OOM();
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CHPP_ASSERT(false);
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} else {
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CHPP_LOGI("Discovery resp count=%" PRIu8, context->registeredServiceCount);
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response->header.error = CHPP_APP_ERROR_NONE;
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// Populate list of services
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for (size_t i = 0; i < context->registeredServiceCount; i++) {
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response->services[i] = context->registeredServices[i]->descriptor;
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}
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// Send out response datagram
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chppEnqueueTxDatagramOrFail(context->transportContext, response,
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responseLen);
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}
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}
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/************************************************
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* Public Functions
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***********************************************/
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bool chppDispatchDiscoveryClientRequest(struct ChppAppState *context,
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const uint8_t *buf, size_t len) {
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UNUSED_VAR(len);
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const struct ChppAppHeader *rxHeader = (const struct ChppAppHeader *)buf;
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bool success = true;
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switch (rxHeader->command) {
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case CHPP_DISCOVERY_COMMAND_DISCOVER_ALL: {
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// Send back a list of services supported by this platform.
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chppDiscoveryDiscoverAll(context, rxHeader);
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break;
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}
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default: {
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success = false;
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}
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}
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return success;
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}
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