CellularError_t Cellular_GetHostByName()

in qgsm/cellular_qgsm_api.c [2554:2644]

• 76 lines of code
• 11 McCabe index (conditional complexity)

CellularError_t Cellular_GetHostByName( CellularHandle_t cellularHandle,
                                        uint8_t contextId,
                                        const char * pcHostName,
                                        char * pResolvedAddress )
{
    CellularContext_t * pContext = ( CellularContext_t * ) cellularHandle;
    CellularError_t cellularStatus = CELLULAR_SUCCESS;
    CellularPktStatus_t pktStatus = CELLULAR_PKT_STATUS_OK;
    char cmdBuf[ CELLULAR_AT_CMD_QUERY_DNS_MAX_SIZE ];
    cellularDnsQueryResult_t dnsQueryResult = CELLULAR_DNS_QUERY_UNKNOWN;
    cellularModuleContext_t * pModuleContext = NULL;
    CellularAtReq_t atReqQueryDns =
    {
        cmdBuf,
        CELLULAR_AT_NO_RESULT,
        NULL,
        NULL,
        NULL,
        0,
    };

    /* pContext is checked in _Cellular_CheckLibraryStatus function. */
    cellularStatus = _Cellular_CheckLibraryStatus( pContext );

    if( cellularStatus != CELLULAR_SUCCESS )
    {
        LogDebug( ( "_Cellular_CheckLibraryStatus failed" ) );
    }
    else if( ( pcHostName == NULL ) || ( pResolvedAddress == NULL ) )
    {
        cellularStatus = CELLULAR_BAD_PARAMETER;
    }
    else
    {
        cellularStatus = _Cellular_IsValidPdn( contextId );
    }

    if( cellularStatus == CELLULAR_SUCCESS )
    {
        cellularStatus = _Cellular_GetModuleContext( pContext, ( void ** ) &pModuleContext );
    }

    if( cellularStatus == CELLULAR_SUCCESS )
    {
        PlatformMutex_Lock( &pModuleContext->dnsQueryMutex );
        pModuleContext->dnsResultNumber = 0;
        pModuleContext->dnsIndex = 0;
        ( void ) xQueueReset( pModuleContext->pktDnsQueue );
        cellularStatus = registerDnsEventCallback( pModuleContext, _dnsResultCallback, pResolvedAddress );
    }

    /* Send the AT command and wait the URC result. */
    if( cellularStatus == CELLULAR_SUCCESS )
    {
        /* The return value of snprintf is not used.
         * The max length of the string is fixed and checked offline. */
        /* coverity[misra_c_2012_rule_21_6_violation]. */
        ( void ) snprintf( cmdBuf, CELLULAR_AT_CMD_QUERY_DNS_MAX_SIZE,
                           "AT+QIDNSGIP=%u,\"%s\"", contextId, pcHostName );
        pktStatus = _Cellular_AtcmdRequestWithCallback( pContext, atReqQueryDns );

        if( pktStatus != CELLULAR_PKT_STATUS_OK )
        {
            LogError( ( "Cellular_GetHostByName: couldn't resolve host name" ) );
            cellularStatus = _Cellular_TranslatePktStatus( pktStatus );
            PlatformMutex_Unlock( &pModuleContext->dnsQueryMutex );
        }
    }

    /* URC handler calls the callback to unblock this function. */
    if( cellularStatus == CELLULAR_SUCCESS )
    {
        if( xQueueReceive( pModuleContext->pktDnsQueue, &dnsQueryResult,
                           pdMS_TO_TICKS( DNS_QUERY_TIMEOUT_MS ) ) == pdTRUE )
        {
            if( dnsQueryResult != CELLULAR_DNS_QUERY_SUCCESS )
            {
                cellularStatus = CELLULAR_UNKNOWN;
            }
        }
        else
        {
            ( void ) registerDnsEventCallback( pModuleContext, NULL, NULL );
            cellularStatus = CELLULAR_TIMEOUT;
        }

        PlatformMutex_Unlock( &pModuleContext->dnsQueryMutex );
    }

    return cellularStatus;
}