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azure_iot_provisioning_client.c
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azure_iot_provisioning_client.c
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/* Copyright (c) Microsoft Corporation.
* Licensed under the MIT License. */
/**
* @file azure_iot_provisioning_client.c
* @brief Implementation of Azure IoT Provisioning client.
*
*/
#include "azure_iot_provisioning_client.h"
/* Kernel includes. */
#include "FreeRTOS.h"
#include "task.h"
/* azure iot includes. */
#include "azure_iot_mqtt.h"
#include "azure_iot_private.h"
#include "azure_iot_result.h"
/* Azure SDK for Embedded C includes */
#include "azure/az_iot.h"
#include "azure/core/az_version.h"
#ifndef azureiotprovisioningDEFAULT_TOKEN_TIMEOUT_IN_SEC
#define azureiotprovisioningDEFAULT_TOKEN_TIMEOUT_IN_SEC azureiotconfigDEFAULT_TOKEN_TIMEOUT_IN_SEC
#endif /* azureiotprovisioningDEFAULT_TOKEN_TIMEOUT_IN_SEC */
#ifndef azureiotprovisioningKEEP_ALIVE_TIMEOUT_SECONDS
#define azureiotprovisioningKEEP_ALIVE_TIMEOUT_SECONDS azureiotconfigKEEP_ALIVE_TIMEOUT_SECONDS
#endif /* azureiotprovisioningKEEP_ALIVE_TIMEOUT_SECONDS */
#ifndef azureiotprovisioningCONNACK_RECV_TIMEOUT_MS
#define azureiotprovisioningCONNACK_RECV_TIMEOUT_MS azureiotconfigCONNACK_RECV_TIMEOUT_MS
#endif /* azureiotprovisioningCONNACK_RECV_TIMEOUT_MS */
#ifndef azureiotprovisioningUSER_AGENT
#define azureiotprovisioningUSER_AGENT ""
#endif /* azureiotprovisioningUSER_AGENT */
#ifndef azureiotprovisioningPROCESS_LOOP_TIMEOUT_MS
#define azureiotprovisioningPROCESS_LOOP_TIMEOUT_MS ( 500U )
#endif /* azureiotprovisioningPROCESS_LOOP_TIMEOUT_MS */
/* Define various workflow (WF) states Provisioning can get into */
#define azureiotprovisioningWF_STATE_INIT ( 0x0 )
#define azureiotprovisioningWF_STATE_CONNECT ( 0x1 )
#define azureiotprovisioningWF_STATE_SUBSCRIBE ( 0x2 )
#define azureiotprovisioningWF_STATE_REQUEST ( 0x3 )
#define azureiotprovisioningWF_STATE_RESPONSE ( 0x4 )
#define azureiotprovisioningWF_STATE_SUBSCRIBING ( 0x5 )
#define azureiotprovisioningWF_STATE_REQUESTING ( 0x6 )
#define azureiotprovisioningWF_STATE_WAITING ( 0x7 )
#define azureiotprovisioningWF_STATE_COMPLETE ( 0x8 )
#define azureiotPrvGetMaxInt( a, b ) ( ( a ) > ( b ) ? ( a ) : ( b ) )
#define azureiotprovisioningREQUEST_PAYLOAD_LABEL "payload"
#define azureiotprovisioningREQUEST_REGISTRATION_ID_LABEL "registrationId"
#define azureiotprovisioningHMACBufferLength ( 48 )
/*-----------------------------------------------------------*/
/**
*
* State transitions :
* CONNECT -> { SUBSCRIBE | COMPLETE } -> { SUBSCRIBING | COMPLETE } -> { REQUEST | COMPLETE } ->
* REQUESTING -> { RESPONSE | COMPLETE } -> { WAITING | COMPLETE } -> { REQUEST | COMPLETE }
*
* Note : At COMPLETE state, we will check the status of lastOperation to see if WorkFlow( WF )
* finshed without error.
*
**/
static void prvProvClientUpdateState( AzureIoTProvisioningClient_t * pxAzureProvClient,
uint32_t ulActionResult )
{
uint32_t ulState = pxAzureProvClient->_internal.ulWorkflowState;
pxAzureProvClient->_internal.ulLastOperationResult = ulActionResult;
switch( ulState )
{
case azureiotprovisioningWF_STATE_CONNECT:
pxAzureProvClient->_internal.ulWorkflowState =
ulActionResult == eAzureIoTSuccess ? azureiotprovisioningWF_STATE_SUBSCRIBE :
azureiotprovisioningWF_STATE_COMPLETE;
break;
case azureiotprovisioningWF_STATE_SUBSCRIBE:
pxAzureProvClient->_internal.ulWorkflowState =
ulActionResult == eAzureIoTSuccess ? azureiotprovisioningWF_STATE_SUBSCRIBING :
azureiotprovisioningWF_STATE_COMPLETE;
break;
case azureiotprovisioningWF_STATE_SUBSCRIBING:
pxAzureProvClient->_internal.ulWorkflowState =
ulActionResult == eAzureIoTSuccess ? azureiotprovisioningWF_STATE_REQUEST :
azureiotprovisioningWF_STATE_COMPLETE;
break;
case azureiotprovisioningWF_STATE_REQUEST:
pxAzureProvClient->_internal.ulWorkflowState =
ulActionResult == eAzureIoTSuccess ? azureiotprovisioningWF_STATE_REQUESTING :
azureiotprovisioningWF_STATE_COMPLETE;
break;
case azureiotprovisioningWF_STATE_REQUESTING:
pxAzureProvClient->_internal.ulWorkflowState =
ulActionResult == eAzureIoTSuccess ? azureiotprovisioningWF_STATE_RESPONSE :
azureiotprovisioningWF_STATE_COMPLETE;
break;
case azureiotprovisioningWF_STATE_RESPONSE:
pxAzureProvClient->_internal.ulWorkflowState =
ulActionResult == eAzureIoTErrorPending ? azureiotprovisioningWF_STATE_WAITING :
azureiotprovisioningWF_STATE_COMPLETE;
break;
case azureiotprovisioningWF_STATE_WAITING:
pxAzureProvClient->_internal.ulWorkflowState =
ulActionResult == eAzureIoTSuccess ? azureiotprovisioningWF_STATE_REQUEST :
azureiotprovisioningWF_STATE_COMPLETE;
break;
case azureiotprovisioningWF_STATE_COMPLETE:
AZLogInfo( ( "AzureIoTProvisioning state 'Complete'" ) );
break;
default:
AZLogError( ( "AzureIoTProvisioning unknown state: [%u]", ( uint16_t ) ulState ) );
configASSERT( false );
break;
}
AZLogDebug( ( "AzureIoTProvisioning updated state from [%u] -> [%u]", ( uint16_t ) ulState,
( uint16_t ) pxAzureProvClient->_internal.ulWorkflowState ) );
}
/*-----------------------------------------------------------*/
/**
*
* Implementation of the connect action. This action is only allowed in azureiotprovisioningWF_STATE_CONNECT
*
* */
static void prvProvClientConnect( AzureIoTProvisioningClient_t * pxAzureProvClient )
{
AzureIoTMQTTConnectInfo_t xConnectInfo = { 0 };
AzureIoTResult_t xResult;
AzureIoTMQTTResult_t xMQTTResult;
bool xSessionPresent;
uint32_t ulPasswordLength = 0;
size_t xMQTTUsernameLength;
az_result xCoreResult;
if( pxAzureProvClient->_internal.ulWorkflowState != azureiotprovisioningWF_STATE_CONNECT )
{
AZLogError( ( "AzureIoTProvisioning connect action called in wrong state: [%u]",
( uint16_t ) pxAzureProvClient->_internal.ulWorkflowState ) );
return;
}
xConnectInfo.pcUserName = pxAzureProvClient->_internal.pucScratchBuffer;
xConnectInfo.pcPassword = xConnectInfo.pcUserName + azureiotconfigUSERNAME_MAX;
if( az_result_failed(
xCoreResult = az_iot_provisioning_client_get_user_name( &pxAzureProvClient->_internal.xProvisioningClientCore,
( char * ) xConnectInfo.pcUserName,
azureiotconfigUSERNAME_MAX, &xMQTTUsernameLength ) ) )
{
AZLogError( ( "AzureIoTProvisioning failed to get username: core error=0x%08x", ( uint16_t ) xCoreResult ) );
xResult = AzureIoT_TranslateCoreError( xCoreResult );
}
/* Check if token refresh is set, then generate password */
else if( ( pxAzureProvClient->_internal.pxTokenRefresh ) &&
( pxAzureProvClient->_internal.pxTokenRefresh( pxAzureProvClient,
pxAzureProvClient->_internal.xGetTimeFunction() +
azureiotprovisioningDEFAULT_TOKEN_TIMEOUT_IN_SEC,
pxAzureProvClient->_internal.pucSymmetricKey,
pxAzureProvClient->_internal.ulSymmetricKeyLength,
( uint8_t * ) xConnectInfo.pcPassword,
azureiotconfigPASSWORD_MAX,
&ulPasswordLength ) ) )
{
AZLogError( ( "AzureIoTProvisioning failed to generate auth token" ) );
xResult = eAzureIoTErrorTokenGenerationFailed;
}
else
{
xConnectInfo.xCleanSession = true;
xConnectInfo.pcClientIdentifier = pxAzureProvClient->_internal.pucRegistrationID;
xConnectInfo.usClientIdentifierLength = ( uint16_t ) pxAzureProvClient->_internal.ulRegistrationIDLength;
xConnectInfo.usUserNameLength = ( uint16_t ) xMQTTUsernameLength;
xConnectInfo.usKeepAliveSeconds = azureiotprovisioningKEEP_ALIVE_TIMEOUT_SECONDS;
xConnectInfo.usPasswordLength = ( uint16_t ) ulPasswordLength;
if( ( xMQTTResult = AzureIoTMQTT_Connect( &( pxAzureProvClient->_internal.xMQTTContext ),
&xConnectInfo, NULL, azureiotprovisioningCONNACK_RECV_TIMEOUT_MS,
&xSessionPresent ) ) != eAzureIoTMQTTSuccess )
{
AZLogError( ( "AzureIoTProvisioning failed to establish MQTT connection: Server=%.*s, MQTT error=0x%08x",
( int16_t ) pxAzureProvClient->_internal.ulEndpointLength,
pxAzureProvClient->_internal.pucEndpoint,
( uint16_t ) xMQTTResult ) );
xResult = eAzureIoTErrorServerError;
}
else
{
/* Successfully established and MQTT connection with the broker. */
AZLogInfo( ( "AzureIoTProvisioning established an MQTT connection with %.*s",
( int16_t ) pxAzureProvClient->_internal.ulEndpointLength,
pxAzureProvClient->_internal.pucEndpoint ) );
xResult = eAzureIoTSuccess;
}
}
prvProvClientUpdateState( pxAzureProvClient, xResult );
}
/*-----------------------------------------------------------*/
/**
*
* Implementation of subscribe action, this action is only allowed in azureiotprovisioningWF_STATE_SUBSCRIBE
*
* */
static void prvProvClientSubscribe( AzureIoTProvisioningClient_t * pxAzureProvClient )
{
AzureIoTMQTTSubscribeInfo_t xMQTTSubscription = { 0 };
AzureIoTMQTTResult_t xMQTTResult;
AzureIoTResult_t xResult;
uint16_t usSubscribePacketIdentifier;
if( pxAzureProvClient->_internal.ulWorkflowState != azureiotprovisioningWF_STATE_SUBSCRIBE )
{
AZLogWarn( ( "AzureIoTProvisioning subscribe action called in wrong state: [%u]",
( uint16_t ) pxAzureProvClient->_internal.ulWorkflowState ) );
}
else
{
xMQTTSubscription.xQoS = eAzureIoTMQTTQoS0;
xMQTTSubscription.pcTopicFilter = ( const uint8_t * ) AZ_IOT_PROVISIONING_CLIENT_REGISTER_SUBSCRIBE_TOPIC;
xMQTTSubscription.usTopicFilterLength = ( uint16_t ) sizeof( AZ_IOT_PROVISIONING_CLIENT_REGISTER_SUBSCRIBE_TOPIC ) - 1;
usSubscribePacketIdentifier = AzureIoTMQTT_GetPacketId( &( pxAzureProvClient->_internal.xMQTTContext ) );
AZLogInfo( ( "AzureIoTProvisioning attempting to subscribe to the MQTT topic: %s", AZ_IOT_HUB_CLIENT_C2D_SUBSCRIBE_TOPIC ) );
if( ( xMQTTResult = AzureIoTMQTT_Subscribe( &( pxAzureProvClient->_internal.xMQTTContext ),
&xMQTTSubscription, 1, usSubscribePacketIdentifier ) ) != eAzureIoTMQTTSuccess )
{
AZLogError( ( "AzureIoTProvisioning failed to subscribe to MQTT topic: MQTT error=0x%08x", ( uint16_t ) xMQTTResult ) );
xResult = eAzureIoTErrorSubscribeFailed;
}
else
{
xResult = eAzureIoTSuccess;
}
prvProvClientUpdateState( pxAzureProvClient, xResult );
}
}
/*-----------------------------------------------------------*/
/**
*
* Implementation of request action. This action is only allowed in azureiotprovisioningWF_STATE_REQUEST
*
* */
static void prvProvClientRequest( AzureIoTProvisioningClient_t * pxAzureProvClient )
{
AzureIoTMQTTResult_t xMQTTResult;
AzureIoTResult_t xResult;
AzureIoTMQTTPublishInfo_t xMQTTPublishInfo = { 0 };
size_t xMQTTTopicLength;
size_t xMQTTPayloadLength = 0;
uint16_t usPublishPacketIdentifier;
az_result xCoreResult;
az_span xCustomPayloadProperty = az_span_create( ( uint8_t * ) pxAzureProvClient->_internal.pucRegistrationPayload,
( int32_t ) pxAzureProvClient->_internal.ulRegistrationPayloadLength );
/* Check the state. */
if( pxAzureProvClient->_internal.ulWorkflowState != azureiotprovisioningWF_STATE_REQUEST )
{
AZLogWarn( ( "AzureIoTProvisioning request action called in wrong state: [%u]",
( uint16_t ) pxAzureProvClient->_internal.ulWorkflowState ) );
}
else
{
/* Check if previous this is the 1st request or subsequent query request */
if( pxAzureProvClient->_internal.xLastResponsePayloadLength == 0 )
{
xCoreResult =
az_iot_provisioning_client_register_get_publish_topic( &pxAzureProvClient->_internal.xProvisioningClientCore,
( char * ) pxAzureProvClient->_internal.pucScratchBuffer,
azureiotconfigTOPIC_MAX, &xMQTTTopicLength );
}
else
{
xCoreResult =
az_iot_provisioning_client_query_status_get_publish_topic( &pxAzureProvClient->_internal.xProvisioningClientCore,
pxAzureProvClient->_internal.xRegisterResponse.operation_id,
( char * ) pxAzureProvClient->_internal.pucScratchBuffer,
azureiotconfigTOPIC_MAX, &xMQTTTopicLength );
}
if( az_result_failed( xCoreResult ) )
{
prvProvClientUpdateState( pxAzureProvClient, eAzureIoTErrorFailed );
return;
}
xMQTTPayloadLength = pxAzureProvClient->_internal.ulScratchBufferLength - ( uint32_t ) xMQTTTopicLength;
xCoreResult =
az_iot_provisioning_client_get_request_payload( &pxAzureProvClient->_internal.xProvisioningClientCore,
xCustomPayloadProperty, NULL,
( uint8_t * ) ( pxAzureProvClient->_internal.pucScratchBuffer +
xMQTTTopicLength ),
( size_t ) xMQTTPayloadLength, &xMQTTPayloadLength );
if( az_result_failed( xCoreResult ) )
{
prvProvClientUpdateState( pxAzureProvClient, eAzureIoTErrorFailed );
return;
}
xMQTTPublishInfo.xQOS = eAzureIoTMQTTQoS0;
xMQTTPublishInfo.pcTopicName = pxAzureProvClient->_internal.pucScratchBuffer;
xMQTTPublishInfo.usTopicNameLength = ( uint16_t ) xMQTTTopicLength;
xMQTTPublishInfo.pvPayload = pxAzureProvClient->_internal.pucScratchBuffer + xMQTTTopicLength;
xMQTTPublishInfo.xPayloadLength = xMQTTPayloadLength;
usPublishPacketIdentifier = AzureIoTMQTT_GetPacketId( &( pxAzureProvClient->_internal.xMQTTContext ) );
if( ( xMQTTResult = AzureIoTMQTT_Publish( &( pxAzureProvClient->_internal.xMQTTContext ),
&xMQTTPublishInfo, usPublishPacketIdentifier ) ) != eAzureIoTMQTTSuccess )
{
AZLogError( ( "AzureIoTProvisioning failed to publish prov request: MQTT error=0x%08x", ( uint16_t ) xMQTTResult ) );
xResult = eAzureIoTErrorPublishFailed;
}
else
{
xResult = eAzureIoTSuccess;
}
prvProvClientUpdateState( pxAzureProvClient, xResult );
}
}
/*-----------------------------------------------------------*/
/**
*
* Implementation of parsing response action, this action is only allowed in azureiotprovisioningWF_STATE_RESPONSE
*
* */
static void prvProvClientParseResponse( AzureIoTProvisioningClient_t * pxAzureProvClient )
{
az_result xCoreResult;
az_span xTopic = az_span_create( pxAzureProvClient->_internal.ucProvisioningLastResponse,
( int32_t ) pxAzureProvClient->_internal.usLastResponseTopicLength );
az_span xPayload = az_span_create( pxAzureProvClient->_internal.ucProvisioningLastResponse +
pxAzureProvClient->_internal.usLastResponseTopicLength,
( int32_t ) pxAzureProvClient->_internal.xLastResponsePayloadLength );
/* Check the state. */
if( pxAzureProvClient->_internal.ulWorkflowState != azureiotprovisioningWF_STATE_RESPONSE )
{
AZLogWarn( ( "AzureIoTProvisioning parse response action called in wrong state: [%u]",
( uint16_t ) pxAzureProvClient->_internal.ulWorkflowState ) );
return;
}
if( ( pxAzureProvClient->_internal.usLastResponseTopicLength == 0 ) ||
( pxAzureProvClient->_internal.xLastResponsePayloadLength == 0 ) )
{
AZLogError( ( "AzureIoTProvisioning client failed with invalid server response" ) );
prvProvClientUpdateState( pxAzureProvClient, eAzureIoTErrorInvalidResponse );
return;
}
xCoreResult =
az_iot_provisioning_client_parse_received_topic_and_payload( &pxAzureProvClient->_internal.xProvisioningClientCore,
xTopic, xPayload, &pxAzureProvClient->_internal.xRegisterResponse );
if( xCoreResult == AZ_ERROR_IOT_TOPIC_NO_MATCH )
{
AZLogInfo( ( "AzureIoTProvisioning ignoring unknown topic." ) );
/* Maintaining the same state. */
return;
}
else if( az_result_failed( xCoreResult ) )
{
AZLogError( ( "AzureIoTProvisioning client failed to parse packet: core error=0x%08x", ( uint16_t ) xCoreResult ) );
prvProvClientUpdateState( pxAzureProvClient, eAzureIoTErrorFailed );
return;
}
if( az_iot_provisioning_client_operation_complete( pxAzureProvClient->_internal.xRegisterResponse.operation_status ) )
{
switch( pxAzureProvClient->_internal.xRegisterResponse.operation_status )
{
case AZ_IOT_PROVISIONING_STATUS_ASSIGNED:
prvProvClientUpdateState( pxAzureProvClient, eAzureIoTSuccess );
break;
case AZ_IOT_PROVISIONING_STATUS_FAILED:
AZLogError( ( "AzureIoTProvisioning client registration failed with error %u: TrackingID: [%.*s] \"%.*s\"",
( uint16_t ) pxAzureProvClient->_internal.xRegisterResponse.registration_state.extended_error_code,
( int16_t ) az_span_size( pxAzureProvClient->_internal.xRegisterResponse.registration_state.error_tracking_id ),
az_span_ptr( pxAzureProvClient->_internal.xRegisterResponse.registration_state.error_tracking_id ),
( int16_t ) az_span_size( pxAzureProvClient->_internal.xRegisterResponse.registration_state.error_message ),
az_span_ptr( pxAzureProvClient->_internal.xRegisterResponse.registration_state.error_message ) ) );
prvProvClientUpdateState( pxAzureProvClient, eAzureIoTErrorServerError );
break;
case AZ_IOT_PROVISIONING_STATUS_DISABLED:
AZLogError( ( "AzureIoTProvisioning client: device is disabled." ) );
prvProvClientUpdateState( pxAzureProvClient, eAzureIoTErrorServerError );
break;
default:
AZLogError( ( "AzureIoTProvisioning unexpected operation status %d", pxAzureProvClient->_internal.xRegisterResponse.operation_status ) );
}
}
else /* Operation is not complete. */
{
if( pxAzureProvClient->_internal.xRegisterResponse.retry_after_seconds == 0 )
{
pxAzureProvClient->_internal.xRegisterResponse.retry_after_seconds = azureiotconfigPROVISIONING_POLLING_INTERVAL_S;
}
pxAzureProvClient->_internal.ullRetryAfter =
pxAzureProvClient->_internal.xGetTimeFunction() +
pxAzureProvClient->_internal.xRegisterResponse.retry_after_seconds;
prvProvClientUpdateState( pxAzureProvClient, eAzureIoTErrorPending );
}
}
/*-----------------------------------------------------------*/
/**
*
* Implementation of wait check action. this action is only allowed in azureiotprovisioningWF_STATE_WAITING
*
* */
static void prvProvClientCheckTimeout( AzureIoTProvisioningClient_t * pxAzureProvClient )
{
if( pxAzureProvClient->_internal.ulWorkflowState == azureiotprovisioningWF_STATE_WAITING )
{
if( pxAzureProvClient->_internal.xGetTimeFunction() >
pxAzureProvClient->_internal.ullRetryAfter )
{
pxAzureProvClient->_internal.ullRetryAfter = 0;
prvProvClientUpdateState( pxAzureProvClient, eAzureIoTSuccess );
}
}
}
/*-----------------------------------------------------------*/
/**
* Trigger state machine action base on the state.
*
**/
static void prvProvClientTriggerAction( AzureIoTProvisioningClient_t * pxAzureProvClient )
{
switch( pxAzureProvClient->_internal.ulWorkflowState )
{
case azureiotprovisioningWF_STATE_CONNECT:
prvProvClientConnect( pxAzureProvClient );
break;
case azureiotprovisioningWF_STATE_SUBSCRIBE:
prvProvClientSubscribe( pxAzureProvClient );
break;
case azureiotprovisioningWF_STATE_REQUEST:
prvProvClientRequest( pxAzureProvClient );
break;
case azureiotprovisioningWF_STATE_RESPONSE:
prvProvClientParseResponse( pxAzureProvClient );
break;
case azureiotprovisioningWF_STATE_SUBSCRIBING:
case azureiotprovisioningWF_STATE_REQUESTING:
case azureiotprovisioningWF_STATE_COMPLETE:
/* None action taken here, as these states are waiting for receive path. */
break;
case azureiotprovisioningWF_STATE_WAITING:
prvProvClientCheckTimeout( pxAzureProvClient );
break;
default:
AZLogError( ( "AzureIoTProvisioning state not handled: [%u]",
( uint16_t ) pxAzureProvClient->_internal.ulWorkflowState ) );
configASSERT( false );
}
}
/*-----------------------------------------------------------*/
/**
* Run the workflow : trigger action on state and process receive path in MQTT loop
*
*/
static AzureIoTResult_t prvProvClientRunWorkflow( AzureIoTProvisioningClient_t * pxAzureProvClient,
uint32_t ulTimeoutMilliseconds )
{
AzureIoTMQTTResult_t xMQTTResult;
AzureIoTResult_t xResult;
uint32_t ulWaitTime;
do
{
if( pxAzureProvClient->_internal.ulWorkflowState == azureiotprovisioningWF_STATE_COMPLETE )
{
AZLogDebug( ( "AzureIoTProvisioning state is already in complete state" ) );
break;
}
if( ulTimeoutMilliseconds > azureiotprovisioningPROCESS_LOOP_TIMEOUT_MS )
{
ulTimeoutMilliseconds -= azureiotprovisioningPROCESS_LOOP_TIMEOUT_MS;
ulWaitTime = azureiotprovisioningPROCESS_LOOP_TIMEOUT_MS;
}
else
{
ulWaitTime = ulTimeoutMilliseconds;
ulTimeoutMilliseconds = 0;
}
prvProvClientTriggerAction( pxAzureProvClient );
if( pxAzureProvClient->_internal.ulWorkflowState == azureiotprovisioningWF_STATE_COMPLETE )
{
AZLogDebug( ( "AzureIoTProvisioning is in complete state: status=0x%08x",
( uint16_t ) pxAzureProvClient->_internal.ulLastOperationResult ) );
break;
}
else if( ( xMQTTResult =
AzureIoTMQTT_ProcessLoop( &( pxAzureProvClient->_internal.xMQTTContext ),
ulWaitTime ) ) != eAzureIoTMQTTSuccess )
{
AZLogError( ( "AzureIoTProvisioning failed to process loop: ProcessLoopDuration=%u, MQTT error=0x%08x",
( uint16_t ) ulTimeoutMilliseconds, ( uint16_t ) xMQTTResult ) );
prvProvClientUpdateState( pxAzureProvClient, eAzureIoTErrorFailed );
break;
}
} while( ulTimeoutMilliseconds );
if( ( pxAzureProvClient->_internal.ulWorkflowState != azureiotprovisioningWF_STATE_COMPLETE ) )
{
xResult = eAzureIoTErrorPending;
}
else
{
xResult = pxAzureProvClient->_internal.ulLastOperationResult;
}
return xResult;
}
/*-----------------------------------------------------------*/
/**
* Process MQTT Subscribe Ack from Provisioning Service
*
*/
static void prvProvClientMQTTProcessSubAck( AzureIoTProvisioningClient_t * pxAzureProvClient,
AzureIoTMQTTPublishInfo_t * pxPacketInfo )
{
( void ) pxPacketInfo;
/* We assume success since IoT Provisioning would disconnect if there was a problem subscribing. */
prvProvClientUpdateState( pxAzureProvClient, eAzureIoTSuccess );
}
/*-----------------------------------------------------------*/
/**
* Process MQTT Response from Provisioning Service
*
*/
static void prvProvClientMQTTProcessResponse( AzureIoTProvisioningClient_t * pxAzureProvClient,
AzureIoTMQTTPublishInfo_t * pxPublishInfo )
{
if( pxAzureProvClient->_internal.ulWorkflowState == azureiotprovisioningWF_STATE_REQUESTING )
{
if( ( pxPublishInfo->xPayloadLength + pxPublishInfo->usTopicNameLength ) <=
sizeof( pxAzureProvClient->_internal.ucProvisioningLastResponse ) )
{
/* Copy topic + payload into the response buffer.
* ucProvisioningLastResponse = [ topic payload ] */
pxAzureProvClient->_internal.usLastResponseTopicLength =
pxPublishInfo->usTopicNameLength;
memcpy( pxAzureProvClient->_internal.ucProvisioningLastResponse,
pxPublishInfo->pcTopicName, pxPublishInfo->usTopicNameLength );
pxAzureProvClient->_internal.xLastResponsePayloadLength =
pxPublishInfo->xPayloadLength;
memcpy( pxAzureProvClient->_internal.ucProvisioningLastResponse +
pxAzureProvClient->_internal.usLastResponseTopicLength,
pxPublishInfo->pvPayload, pxPublishInfo->xPayloadLength );
prvProvClientUpdateState( pxAzureProvClient, eAzureIoTSuccess );
}
else
{
AZLogError( ( "AzureIoTProvisioning process response failed with buffer too small required size is %d bytes",
pxPublishInfo->xPayloadLength + pxPublishInfo->usTopicNameLength ) );
prvProvClientUpdateState( pxAzureProvClient, eAzureIoTErrorOutOfMemory );
}
}
}
/*-----------------------------------------------------------*/
/**
* Callback that receives all the Event from MQTT
*
*/
static void prvProvClientEventCallback( AzureIoTMQTTHandle_t pxMQTTContext,
AzureIoTMQTTPacketInfo_t * pxPacketInfo,
AzureIoTMQTTDeserializedInfo_t * pxDeserializedInfo )
{
AzureIoTProvisioningClient_t * pxAzureProvClient = ( AzureIoTProvisioningClient_t * ) pxMQTTContext;
if( ( pxPacketInfo->ucType & 0xF0U ) == azureiotmqttPACKET_TYPE_SUBACK )
{
prvProvClientMQTTProcessSubAck( pxAzureProvClient,
pxDeserializedInfo->pxPublishInfo );
}
else if( ( pxPacketInfo->ucType & 0xF0U ) == azureiotmqttPACKET_TYPE_PUBLISH )
{
prvProvClientMQTTProcessResponse( pxAzureProvClient,
pxDeserializedInfo->pxPublishInfo );
}
else
{
AZLogDebug( ( "AzureIoTProvisioning received packet of type: %d", pxPacketInfo->ucType ) );
}
}
/*-----------------------------------------------------------*/
/**
* Generate the SAS token based on :
* https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-devguide-security#use-a-shared-access-policy
*
*/
static uint32_t prvProvClientGetToken( AzureIoTProvisioningClient_t * pxAzureProvClient,
uint64_t ullExpiryTimeSecs,
const uint8_t * ucKey,
uint32_t ulKeyLen,
uint8_t * pucSASBuffer,
uint32_t ulSasBufferLen,
uint32_t * pulSaSLength )
{
uint8_t * pucHMACBuffer;
az_span xSpan = az_span_create( pucSASBuffer, ( int32_t ) ulSasBufferLen );
az_result xCoreResult;
uint32_t ulBytesUsed;
uint32_t ulSignatureLength;
uint32_t ulBufferLeft;
size_t xLength;
xCoreResult = az_iot_provisioning_client_sas_get_signature( &( pxAzureProvClient->_internal.xProvisioningClientCore ),
ullExpiryTimeSecs, xSpan, &xSpan );
if( az_result_failed( xCoreResult ) )
{
AZLogError( ( "AzureIoTProvisioning failed to get signature: core error=0x%08x", ( uint16_t ) xCoreResult ) );
return AzureIoT_TranslateCoreError( xCoreResult );
}
ulBytesUsed = ( uint32_t ) az_span_size( xSpan );
ulBufferLeft = ulSasBufferLen - ulBytesUsed;
if( ulBufferLeft < azureiotprovisioningHMACBufferLength )
{
AZLogError( ( "AzureIoTProvisioning token generation failed with insufficient buffer size" ) );
return eAzureIoTErrorOutOfMemory;
}
/* Calculate HMAC at the end of buffer, so we do less data movement when returning back to caller. */
ulBufferLeft -= azureiotprovisioningHMACBufferLength;
pucHMACBuffer = pucSASBuffer + ulSasBufferLen - azureiotprovisioningHMACBufferLength;
if( AzureIoT_Base64HMACCalculate( pxAzureProvClient->_internal.xHMACFunction,
ucKey, ulKeyLen, pucSASBuffer, ulBytesUsed, pucSASBuffer + ulBytesUsed, ulBufferLeft,
pucHMACBuffer, azureiotprovisioningHMACBufferLength,
&ulSignatureLength ) )
{
AZLogError( ( "AzureIoTProvisioning failed to encoded HMAC hash" ) );
return eAzureIoTErrorFailed;
}
if( ( ulSasBufferLen <= azureiotprovisioningHMACBufferLength ) )
{
AZLogError( ( "AzureIoTProvisioning failed with insufficient buffer size" ) );
return eAzureIoTErrorOutOfMemory;
}
xSpan = az_span_create( pucHMACBuffer, ( int32_t ) ulSignatureLength );
xCoreResult = az_iot_provisioning_client_sas_get_password( &( pxAzureProvClient->_internal.xProvisioningClientCore ),
xSpan, ullExpiryTimeSecs, AZ_SPAN_EMPTY, ( char * ) pucSASBuffer,
ulSasBufferLen - azureiotprovisioningHMACBufferLength,
&xLength );
if( az_result_failed( xCoreResult ) )
{
AZLogError( ( "AzureIoTProvisioning failed to generate token: core error=0x%08x", ( uint16_t ) xCoreResult ) );
return AzureIoT_TranslateCoreError( xCoreResult );
}
*pulSaSLength = ( uint32_t ) xLength;
return eAzureIoTSuccess;
}
/*-----------------------------------------------------------*/
/**
* Get number of millseconds passed to MQTT stack
*
*/
static uint32_t prvProvClientGetTimeMillseconds( void )
{
TickType_t xTickCount = 0;
uint32_t ulTimeMs = 0UL;
/* Get the current tick count. */
xTickCount = xTaskGetTickCount();
/* Convert the ticks to milliseconds. */
ulTimeMs = ( uint32_t ) xTickCount * azureiotMILLISECONDS_PER_TICK;
return ulTimeMs;
}
/*-----------------------------------------------------------*/
AzureIoTResult_t AzureIoTProvisioningClient_OptionsInit( AzureIoTProvisioningClientOptions_t * pxProvisioningClientOptions )
{
AzureIoTResult_t xResult;
if( pxProvisioningClientOptions == NULL )
{
AZLogError( ( "AzureIoTProvisioningClient_OptionsInit failed: invalid argument" ) );
xResult = eAzureIoTErrorInvalidArgument;
}
else
{
pxProvisioningClientOptions->pucUserAgent = ( const uint8_t * ) azureiotprovisioningUSER_AGENT;
pxProvisioningClientOptions->ulUserAgentLength = sizeof( azureiotprovisioningUSER_AGENT ) - 1;
xResult = eAzureIoTSuccess;
}
return xResult;
}
/*-----------------------------------------------------------*/
AzureIoTResult_t AzureIoTProvisioningClient_Init( AzureIoTProvisioningClient_t * pxAzureProvClient,
const uint8_t * pucEndpoint,
uint32_t ulEndpointLength,
const uint8_t * pucIDScope,
uint32_t ulIDScopeLength,
const uint8_t * pucRegistrationID,
uint32_t ulRegistrationIDLength,
AzureIoTProvisioningClientOptions_t * pxProvisioningClientOptions,
uint8_t * pucBuffer,
uint32_t ulBufferLength,
AzureIoTGetCurrentTimeFunc_t xGetTimeFunction,
const AzureIoTTransportInterface_t * pxTransportInterface )
{
AzureIoTResult_t xResult;
az_span xEndpoint = az_span_create( ( uint8_t * ) pucEndpoint, ( int32_t ) ulEndpointLength );
az_span xIDScope = az_span_create( ( uint8_t * ) pucIDScope, ( int32_t ) ulIDScopeLength );
az_span xRegistrationID = az_span_create( ( uint8_t * ) pucRegistrationID, ( int32_t ) ulRegistrationIDLength );
az_result xCoreResult;
AzureIoTMQTTResult_t xMQTTResult;
az_iot_provisioning_client_options xOptions = az_iot_provisioning_client_options_default();
uint8_t * pucNetworkBuffer;
uint32_t ulNetworkBufferLength;
if( ( pxAzureProvClient == NULL ) ||
( pucEndpoint == NULL ) || ( ulEndpointLength == 0 ) ||
( pucIDScope == NULL ) || ( ulIDScopeLength == 0 ) ||
( pucRegistrationID == NULL ) || ( ulRegistrationIDLength == 0 ) ||
( pucBuffer == NULL ) || ( ulBufferLength == 0 ) ||
( xGetTimeFunction == NULL ) || ( pxTransportInterface == NULL ) )
{
AZLogError( ( "AzureIoTProvisioningClient_Init failed: invalid argument" ) );
xResult = eAzureIoTErrorInvalidArgument;
}
else if( ( ulBufferLength < ( azureiotconfigTOPIC_MAX + azureiotconfigPROVISIONING_REQUEST_PAYLOAD_MAX ) ) ||
( ulBufferLength < ( azureiotconfigUSERNAME_MAX + azureiotconfigPASSWORD_MAX ) ) )
{
AZLogError( ( "AzureIoTProvisioningClient_Init failed: insufficient buffer size" ) );
xResult = eAzureIoTErrorOutOfMemory;
}
else
{
memset( pxAzureProvClient, 0, sizeof( AzureIoTProvisioningClient_t ) );
/* Setup scratch buffer to be used by middleware */
pxAzureProvClient->_internal.ulScratchBufferLength =
azureiotPrvGetMaxInt( ( azureiotconfigUSERNAME_MAX + azureiotconfigPASSWORD_MAX ),
( azureiotconfigTOPIC_MAX + azureiotconfigPROVISIONING_REQUEST_PAYLOAD_MAX ) );
pxAzureProvClient->_internal.pucScratchBuffer = pucBuffer;
pucNetworkBuffer = pucBuffer + pxAzureProvClient->_internal.ulScratchBufferLength;
ulNetworkBufferLength = ulBufferLength - pxAzureProvClient->_internal.ulScratchBufferLength;
pxAzureProvClient->_internal.pucEndpoint = pucEndpoint;
pxAzureProvClient->_internal.ulEndpointLength = ulEndpointLength;
pxAzureProvClient->_internal.pucIDScope = pucIDScope;
pxAzureProvClient->_internal.ulIDScopeLength = ulIDScopeLength;
pxAzureProvClient->_internal.pucRegistrationID = pucRegistrationID;
pxAzureProvClient->_internal.ulRegistrationIDLength = ulRegistrationIDLength;
pxAzureProvClient->_internal.xGetTimeFunction = xGetTimeFunction;
if( pxProvisioningClientOptions )
{
xOptions.user_agent = az_span_create( ( uint8_t * ) pxProvisioningClientOptions->pucUserAgent,
( int32_t ) pxProvisioningClientOptions->ulUserAgentLength );
}
else
{
xOptions.user_agent = az_span_create( ( uint8_t * ) azureiotprovisioningUSER_AGENT,
sizeof( azureiotprovisioningUSER_AGENT ) - 1 );
}
xCoreResult = az_iot_provisioning_client_init( &( pxAzureProvClient->_internal.xProvisioningClientCore ),
xEndpoint, xIDScope, xRegistrationID, &xOptions );
if( az_result_failed( xCoreResult ) )
{
AZLogError( ( "AzureIoTProvisioning initialization failed: core error=0x%08x", ( uint16_t ) xCoreResult ) );
xResult = AzureIoT_TranslateCoreError( xCoreResult );
}
else if( ( xMQTTResult = AzureIoTMQTT_Init( &( pxAzureProvClient->_internal.xMQTTContext ),
pxTransportInterface, prvProvClientGetTimeMillseconds,
prvProvClientEventCallback, pucNetworkBuffer,
ulNetworkBufferLength ) ) != eAzureIoTMQTTSuccess )
{
AZLogError( ( "AzureIoTProvisioning initialization failed: MQTT error=0x%08x", ( uint16_t ) xMQTTResult ) );
xResult = eAzureIoTErrorInitFailed;
}
else
{
xResult = eAzureIoTSuccess;
}
}
return xResult;
}
/*-----------------------------------------------------------*/
void AzureIoTProvisioningClient_Deinit( AzureIoTProvisioningClient_t * pxAzureProvClient )
{
if( pxAzureProvClient == NULL )
{
AZLogError( ( "AzureIoTProvisioningClient_Deinit failed: invalid argument" ) );
}
}
/*-----------------------------------------------------------*/
AzureIoTResult_t AzureIoTProvisioningClient_SetSymmetricKey( AzureIoTProvisioningClient_t * pxAzureProvClient,
const uint8_t * pucSymmetricKey,
uint32_t ulSymmetricKeyLength,
AzureIoTGetHMACFunc_t xHmacFunction )
{
AzureIoTResult_t xResult;
if( ( pxAzureProvClient == NULL ) ||
( pucSymmetricKey == NULL ) || ( ulSymmetricKeyLength == 0 ) ||
( xHmacFunction == NULL ) )
{
AZLogError( ( "AzureIoTProvisioningClient_SetSymmetricKey failed: invalid argument" ) );
xResult = eAzureIoTErrorInvalidArgument;
}
else
{
pxAzureProvClient->_internal.pucSymmetricKey = pucSymmetricKey;
pxAzureProvClient->_internal.ulSymmetricKeyLength = ulSymmetricKeyLength;
pxAzureProvClient->_internal.pxTokenRefresh = prvProvClientGetToken;
pxAzureProvClient->_internal.xHMACFunction = xHmacFunction;
xResult = eAzureIoTSuccess;
}
return xResult;
}
/*-----------------------------------------------------------*/
AzureIoTResult_t AzureIoTProvisioningClient_Register( AzureIoTProvisioningClient_t * pxAzureProvClient,
uint32_t ulTimeoutMilliseconds )
{
AzureIoTResult_t xResult;
if( pxAzureProvClient == NULL )
{
AZLogError( ( "AzureIoTProvisioningClient_Register failed: invalid argument" ) );
xResult = eAzureIoTErrorInvalidArgument;
}
else
{
if( pxAzureProvClient->_internal.ulWorkflowState == azureiotprovisioningWF_STATE_INIT )
{
pxAzureProvClient->_internal.ulWorkflowState = azureiotprovisioningWF_STATE_CONNECT;
}
xResult = prvProvClientRunWorkflow( pxAzureProvClient, ulTimeoutMilliseconds );
}
return xResult;
}
/*-----------------------------------------------------------*/
AzureIoTResult_t AzureIoTProvisioningClient_GetDeviceAndHub( AzureIoTProvisioningClient_t * pxAzureProvClient,
uint8_t * pucHubHostname,
uint32_t * pulHostnameLength,
uint8_t * pucDeviceID,
uint32_t * pulDeviceIDLength )
{
uint32_t ulHostnameLength;
uint32_t ulDeviceIDLength;
AzureIoTResult_t xResult;
az_span * pxHostname;
az_span * pxDeviceID;
if( ( pxAzureProvClient == NULL ) || ( pucHubHostname == NULL ) ||
( pulHostnameLength == NULL ) || ( pucDeviceID == NULL ) || ( pulDeviceIDLength == NULL ) )
{
AZLogError( ( "AzureIoTProvisioningClient_GetDeviceAndHub failed: invalid argument" ) );
xResult = eAzureIoTErrorInvalidArgument;
}
else if( pxAzureProvClient->_internal.ulWorkflowState != azureiotprovisioningWF_STATE_COMPLETE )
{
AZLogError( ( "AzureIoTProvisioning client state is not in complete state" ) );
xResult = eAzureIoTErrorFailed;
}
else if( pxAzureProvClient->_internal.ulLastOperationResult )
{
xResult = pxAzureProvClient->_internal.ulLastOperationResult;
}
else
{
pxHostname = &pxAzureProvClient->_internal.xRegisterResponse.registration_state.assigned_hub_hostname;
pxDeviceID = &pxAzureProvClient->_internal.xRegisterResponse.registration_state.device_id;
ulHostnameLength = ( uint32_t ) az_span_size( *pxHostname );
ulDeviceIDLength = ( uint32_t ) az_span_size( *pxDeviceID );
if( ( *pulHostnameLength < ulHostnameLength ) || ( *pulDeviceIDLength < ulDeviceIDLength ) )
{
AZLogWarn( ( "AzureIoTProvisioning memory buffer passed is not enough to store hub info" ) );
xResult = eAzureIoTErrorFailed;
}
else
{
memcpy( pucHubHostname, az_span_ptr( *pxHostname ), ulHostnameLength );
memcpy( pucDeviceID, az_span_ptr( *pxDeviceID ), ulDeviceIDLength );
*pulHostnameLength = ulHostnameLength;
*pulDeviceIDLength = ulDeviceIDLength;
xResult = eAzureIoTSuccess;
}
}
return xResult;
}
/*-----------------------------------------------------------*/
AzureIoTResult_t AzureIoTProvisioningClient_GetExtendedCode( AzureIoTProvisioningClient_t * pxAzureProvClient,
uint32_t * pulExtendedErrorCode )
{
AzureIoTResult_t xResult;
if( ( pxAzureProvClient == NULL ) ||
( pulExtendedErrorCode == NULL ) )
{
AZLogError( ( "AzureIoTProvisioningClient_GetExtendedCode failed: invalid argument" ) );
xResult = eAzureIoTErrorInvalidArgument;
}
else if( pxAzureProvClient->_internal.ulWorkflowState != azureiotprovisioningWF_STATE_COMPLETE )
{
AZLogError( ( "AzureIoTProvisioning client state is not in complete state" ) );
xResult = eAzureIoTErrorFailed;
}
else
{
*pulExtendedErrorCode =
pxAzureProvClient->_internal.xRegisterResponse.registration_state.extended_error_code;
xResult = eAzureIoTSuccess;
}
return xResult;
}
/*-----------------------------------------------------------*/
AzureIoTResult_t AzureIoTProvisioningClient_SetRegistrationPayload( AzureIoTProvisioningClient_t * pxAzureProvClient,
const uint8_t * pucPayload,
uint32_t ulPayloadLength )
{
AzureIoTResult_t xResult;
if( ( pxAzureProvClient == NULL ) ||
( pucPayload == NULL ) || ( ulPayloadLength == 0 ) )
{
AZLogError( ( "AzureIoTProvisioningClient_SetRegistrationPayload failed: invalid argument" ) );
xResult = eAzureIoTErrorInvalidArgument;
}