DLT.CONF(5)

NAME
dlt.conf - DLT daemon configuration file

DESCRIPTION
The DLT daemon is the central application which gathers logs and traces from different applications, stores them temporarily or permanently and transfers them to a DLT client application, which could run directly on the COVESA system or more likely on some external tester device.

The configuration file dlt.conf allows one to configure the different runtime behaviour of the dlt-daemon. It is loaded during startup of dlt-daemon.

GENERAL OPTIONS

  Verbose
Start daemon in debug mode, so that all internal debug information is printed out on the console.

        Default: Off

  Daemonize
If set to 1 DLT daemon is started in background as daemon. This option is only needed in System V init systems. In systemd based startup systems the daemon is started by spawning own process.

        Default: 0

  SendSerialHeader
If set to 1 DLT daemon sends each DLT message to the client with prepanding the serial header “DLS0x01”.

        Default: 0

  SendContextRegistration
If set to 1 each context which is registered from an application in the DLT daemon generates a message to inform the DLT client about the new context.

        Default: 1

  SendMessageTime
If set to 1 DLt daemon sends each second a DLT control message to the client with the current timestamp from the system.

        Default: 0

  ECUId
This value sets the ECU Id, which is sent with each DLT message.

        Default: ECU1

  SharedMemorySize
This value sets the size of the shared memory, which is used to exchange DLT messages between applications and daemon. This value is defined in bytes. If this value is changed the system must be rebooted to take effect.

        Default: 100000

  PersistanceStoragePath
This is the directory path, where the DLT daemon stores its runtime configuration. Runtime configuration includes stored log levels, trace status and changed logging mode.

        Default: /tmp

  LoggingMode
The logging console for internal logging of dlt-daemon. 0 = log to stdout, 1 = log to syslog, 2 = log to file (see LoggingFilename), 3 = log to stderr

        Default: 0

  LoggingLevel
The internal log level, up to which logs are written. LOG_EMERG = 0, LOG_ALERT = 1, LOG_CRIT = 2, LOG_ERR = 3, LOG_WARNING = 4, LOG_NOTICE = 5, LOG_INFO = 6, LOG_DEBUG = 7

        Default: 6

  LoggingFilename
If LoggingMode is set to 2 logs are written to the file path given here.

        Default: /tmp/dlt.log

  EnableLoggingFileLimit
Only relevant for logging in file (LoggingMode = 2). If EnableLoggingFileLimit is set to 0, the daemon logs to one logging file without any size limit. If EnableLoggingFileLimit is set to 1, the daemon considers the size limits configured by LoggingFileSize and LoggingFileMaxSize. If the limits are configured accordingly, multiple log files are used.

        Default: 0

  LoggingFileSize
Only considered for logging in file (LoggingMode = 2) and EnableLoggingFileLimit = 1. Maximum size in bytes of one logging file.

        Default: 250000

  LoggingFileMaxSize
Only considered for logging in file (LoggingMode = 2) and EnableLoggingFileLimit = 1. Maximum size in bytes of all logging files.

        Default: 1000000

  TimeOutOnSend
Socket timeout in seconds for sending to clients.

        Default: 4

  RingbufferMinSize
The minimum size of the Ringbuffer, used for storing temporary DLT messages, until client is connected.

        Default: 500000

  RingbufferMaxSize
The max size of the Ringbuffer, used for storing temporary DLT messages, until client is connected.

        Default: 10000000

  RingbufferStepSize
The step size the Ringbuffer is increased, used for storing temporary DLT messages, until client is connected.

        Default: 500000

  Daemon FIFOSize
The size of Daemon FIFO (MinSize: depend on pagesize of system, MaxSize: please check /proc/sys/fs/pipe-max-size) This is only supported for Linux.

        Default: 65536

  ContextLogLevel
Initial log-level that is sent when an application registers. DLT_LOG_OFF = 0, DLT_LOG_FATAL = 1, DLT_LOG_ERROR = 2, DLT_LOG_WARN = 3, DLT_LOG_INFO = 4, DLT_LOG_DEBUG = 5, DLT_LOG_VERBOSE = 6

        Default: 4

  ContextTraceStatus
Initial trace-status that is sent when an application registers. DLT_TRACE_STATUS_OFF = 0, DLT_TRACE_STATUS_ON = 1

        Default: 0

  ForceContextLogLevelAndTraceStatus
Force log level and trace status of contexts to not exceed “ContextLogLevel” and “ContextTraceStatus”. If set to 1 (ON) whenever a context registers or changes the log-level it has to be lower or equal to ContextLogLevel.

        Default: 0

  InjectionMode
If set to 0, the injection mode (see here) is disabled.

        Default: 1

GATEWAY CONFIGURATION

  GatewayMode
Enable Gateway mode

        Default: 0

  GatewayConfigFile
Read gateway configuration from another location

        Default: /etc/dlt_gateway.conf

Permission configuration
DLT daemon runs with e.g. User: covesa_dlt Group: covesa_dlt

DLT user applications run with different user and group than dlt-daemon but with supplimentory group: dlt_user_apps_group

/dlt FIFO will be created by dlt-daemon with User: covesa_dlt Group: dlt_user_apps_group Permission: 620

so that only dlt-daemon can read and only processes in dlt_user_apps_group can write.

/dltpipes will be created by dlt-daemon with User: covesa_dlt Group: covesa_dlt Permission: 3733 (i.e Sticky bit and SGID turned on)

/dltpipes/dlt FIFO will be created by dlt application (user lib) with User: Group: covesa_dlt (inherited from dltpipes/ due to SGID) Permission: 620

Thus DLT user applications (and also or attackers) can create the dlt FIFO (for communication from dlt-daemon to DLT user application) under /dltpipes/. Since sticky bit is set the applications who creates the FIFO can only rename/delete it.

Since SGID of /dltpipes is set the group of dlt FIFO will be covesa_dlt which enables dlt daemon to have write permission on all the dlt FIFO.

One dlt user application cannot access dlt FIFO created by other dlt user application(if they run with different user).

Owner group of daemon FIFO directory(Default: /tmp/dlt) (If not set, primary group of dlt-daemon process is used). Application should have write permission to this group for tracing into dlt. For this opton to work, dlt-daemon should have this group in it’s supplementary group.

  DaemonFifoGroup
Owner group of daemon FIFO directory (If not set, primary group of dlt-daemon process is used) Application should have write permission to this group for tracing into dlt For this opton to work, dlt-daemon should have this group in it’s Supplementary group

        Default: group of dlt-daemon process (/tmp/dlt)

CONTROL APPLICATION OPTIONS

  ControlSocketPath
Path to control socket.

        Default: /tmp/dlt-ctrl.sock

OFFLINE TRACE OPTIONS

  OfflineTraceDirectory
Store DLT messages to local directory, if not set offline Trace is off.

        Default: /tmp

  OfflineTraceFileSize
This value defines the max size of a offline trace file, if offline trace is enabled. This value is defined in bytes. If the files size of the current used log file is exceeded, a new log file is created.

        Default: 1000000

  OfflineTraceMaxSize
This value defines the max offline Trace memory size, if offline trace is enabled. This value is defined in bytes. If the overall offline trace size is exceeded, the oldest log files are deleted, until a new trace file fits the overall offline trace max size.

        Default: 4000000

  OfflineTraceFileNameTimestampBased
Filename timestamp based or index based. 1 = timestamp based, 0 = index based

        Default: Function is disabled

LOCAL CONSOLE OUTPUT OPTIONS

  PrintASCII
Prints each received DLT message from the application in ASCII to the local console. This option should only be anabled for debugging purpose.

        Default: Function is disabled

  PrintHex
Prints each received DLT message from the application in ASCII to the local console. The payload is printed in Hex. This option should only be anabled for debugging purpose.

        Default: Function is disabled

  PrintHeadersOnly
Prints each received DLT message from the application in ASCII to the local console. Only the header is printed. This option should only be anabled for debugging purpose.

        Default: Function is disabled

SERIAL CLIENT OPTIONS

  RS232DeviceName
If this value is set to a serial device name, e.g. /dev/ttyS0, a serial port is used for logging to a client.

        Default: Serial port for logging is disabled

  RS232Baudrate
The used serial baud rate, if serial logging is enabled. The RS232DeviceName must be set to enable serial logging.

        Default: 115200

  RS232SyncSerialHeader
If serial logging is enabled, each received DLT message is checked to contain a serial header. If the DLT message contains no serial header, the message is ignored.

        Default: Function is disabled

TCP CLIENT OPTIONS

  TCPSyncSerialHeader
Each received DLT message on a TCP connection is checked to contain a serial header. If the DLT message contains no serial header, the message is ignored.

        Default: Function is disabled

ECU SOFTWARE VERSION OPTIONS

  SendECUSoftwareVersion
Periodically send ECU version info. 0 = disabled, 1 = enabled

        Default: Function is disabled

PathToECUSoftwareVersion
Absolute path to file storing version information - if disabled the DLT version will be send.

        Default: Function is disabled.

TIMEZONE INFO OPTIONS

SendTimezone
Periodically send timezone info. 0 = disabled, 1 = enabled

        Default: Function is disabled

OFFLINE LOGSTORAGE OPTIONS

  OfflineLogstorageMaxDevices
Maximum devices to be used as offline logstorage devices. 0 = disabled, 1 .. DLT_OFFLINE_LOGSTORAGE_MAX_DEVICES

        Default: 0 (Function is disabled)

  OfflineLogstorageDirPath
Path to store DLT offline log storage messages.

        Default: off

  OfflineLogstorageTimestamp
Appends timestamp in log file name. 0 = disabled, 1 = enabled

        Default: 0

  OfflineLogstorageDelimiter
Appends delimiter in log file name, only punctuation characters allowed.

        Default: _

  OfflineLogstorageMaxCounter
Wrap around value for log file count in file name.

        Default: UINT_MAX

  OfflineLogstorageCacheSize
Maximal used memory for log storage cache in KB.

        Default: 30000 KB

  UDPConnectionSetup
Enable or disable UDP connection. 0 = disabled, 1 = enabled

  UDPMulticastIPAddress
The address on which daemon multicasts the log messages

  UDPMulticastIPPort
The Multicase IP port. Default: 3491

AUTHOR
Alexander Wenzel (alexander.aw.wenzel (at) bmw (dot) de)

COPYRIGHT
Copyright (C) 2015 BMW AG. License MPL-2.0: Mozilla Public License version 2.0 http://mozilla.org/MPL/2.0/ .

BUGS
See Github issue: https://github.com/COVESA/dlt-daemon/issues

SEE ALSO
dlt-daemon(1), dlt-system(1)