TFTPServer Class

Properties   Methods   Events   Config Settings   Errors  

The TFTPServer Class is used to create a TFTP Server.

Syntax

class ipworks.TFTPServer

Remarks

The TFTPServer class provides a simple way to create a TFTP server. Any TFTP client will be able to connect and transfer files to and from the server.

Getting Started

By default, the server will listen on port 69. You can specify the listening port by setting the local_port property.

Optionally set the local_dir property to a valid local path. If this property is set the class will serve files from this location. When clients connect, they can request files from this location. If this property is not set then the class will fire events allowing customized responses for each operation.

To start the server, call the start_listening method.

Handling Events

Event handlers are the primary method of customizing the class's functionality. When a client attempts to connect, open a file, etc, the corresponding TFTPServer event will fire to allow for custom handling of the client's request.

The following events are fired once the requested operation is executed:

• on_error
• on_log
• on_connected
• on_connection_request
• on_disconnected
• on_end_transfer
• on_start_transfer
• on_transfer

Property List

---

The following is the full list of the properties of the class with short descriptions. Click on the links for further details.

Method List

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The following is the full list of the methods of the class with short descriptions. Click on the links for further details.

Event List

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The following is the full list of the events fired by the class with short descriptions. Click on the links for further details.

Config Settings

---

The following is a list of config settings for the class with short descriptions. Click on the links for further details.

conn_count Property

The number of records in the Conn arrays.

Syntax

def get_conn_count() -> int: ...

conn_count = property(get_conn_count, None)

Default Value

0

Remarks

This property controls the size of the following arrays:

• conn_connection_id
• conn_file_data
• conn_filename
• conn_local_file
• conn_remote_host
• conn_remote_port
• conn_transfer_mode

The array indices start at 0 and end at conn_count - 1.

This property is read-only.

conn_connection_id Property

This property contains a unique indentifier for this connection.

Syntax

def get_conn_connection_id(conn_id: int) -> str: ...

Default Value

""

Remarks

This field contains a unique indentifier for this connection.

The conn_id parameter specifies the index of the item in the array. The size of the array is controlled by the conn_count property.

This property is read-only.

conn_file_data Property

This property is only available for sending data to a connected client.

Syntax

def get_conn_file_data(conn_id: int) -> bytes: ...
def set_conn_file_data(conn_id: int, value: bytes) -> None: ...

Default Value

""

Remarks

This property is only available for sending data to a connected client. If this property is set, then this will be the data sent when a connected client attempts to download a file from the server.

The conn_id parameter specifies the index of the item in the array. The size of the array is controlled by the conn_count property.

conn_filename Property

This property represents the Filename of the file the client wants to upload or download.

Syntax

def get_conn_filename(conn_id: int) -> str: ...

Default Value

""

Remarks

This property represents the Filename of the file the client wants to upload or download. Note: FileData must be empty in order to use this property.

The conn_id parameter specifies the index of the item in the array. The size of the array is controlled by the conn_count property.

This property is read-only.

conn_local_file Property

This is the local file on the server.

Syntax

def get_conn_local_file(conn_id: int) -> str: ...
def set_conn_local_file(conn_id: int, value: str) -> None: ...

Default Value

""

Remarks

This is the local file on the server. This file is written to when a client puts a file, and data is pulled from this file when a client requests a file.

The conn_id parameter specifies the index of the item in the array. The size of the array is controlled by the conn_count property.

conn_remote_host Property

This property represents the IP address of the connected client.

Syntax

def get_conn_remote_host(conn_id: int) -> str: ...

Default Value

""

Remarks

This property represents the IP address of the connected client.

The conn_id parameter specifies the index of the item in the array. The size of the array is controlled by the conn_count property.

This property is read-only.

conn_remote_port Property

This property represents the port of the connected client.

Syntax

def get_conn_remote_port(conn_id: int) -> int: ...

Default Value

0

Remarks

This property represents the port of the connected client.

The conn_id parameter specifies the index of the item in the array. The size of the array is controlled by the conn_count property.

This property is read-only.

conn_transfer_mode Property

Transfers are done in octet mode 0 or netascii mode 1 .

Syntax

def get_conn_transfer_mode(conn_id: int) -> str: ...

Default Value

""

Remarks

Transfers are done in octet mode 0 or netascii mode 1.

The conn_id parameter specifies the index of the item in the array. The size of the array is controlled by the conn_count property.

This property is read-only.

listening Property

If set to True, the class accepts incoming connections on LocalPort.

Syntax

def get_listening() -> bool: ...
def set_listening(value: bool) -> None: ...

listening = property(get_listening, set_listening)

Default Value

FALSE

Remarks

This property indicates whether the class is listening for connections on the port specified by the local_port property.

Note: Use the start_listening and stop_listening methods to control whether the class is listening.

local_dir Property

The local file directory for the server.

Syntax

def get_local_dir() -> str: ...
def set_local_dir(value: str) -> None: ...

local_dir = property(get_local_dir, set_local_dir)

Default Value

""

Remarks

This property defines the local file directory on the server. Files can be downloaded to or uploaded from this directory.

local_host Property

The name of the local host or user-assigned IP interface through which connections are initiated or accepted.

Syntax

def get_local_host() -> str: ...
def set_local_host(value: str) -> None: ...

local_host = property(get_local_host, set_local_host)

Default Value

""

Remarks

The local_host property contains the name of the local host as obtained by the gethostname() system call, or if the user has assigned an IP address, the value of that address.

In multi-homed hosts (machines with more than one IP interface) setting LocalHost to the value of an interface will make the class initiate connections (or accept in the case of server classs) only through that interface.

If the class is connected, the local_host property shows the IP address of the interface through which the connection is made in internet dotted format (aaa.bbb.ccc.ddd). In most cases, this is the address of the local host, except for multi-homed hosts (machines with more than one IP interface).

NOTE: local_host is not persistent. You must always set it in code, and never in the property window.

local_port Property

This is the port that the server will listen on.

Syntax

def get_local_port() -> int: ...
def set_local_port(value: int) -> None: ...

local_port = property(get_local_port, set_local_port)

Default Value

69

Remarks

This property contains the port that the TFTP Server listens on. The default value is 69.

max_retransmits Property

The number of times to retry sending a failed packet before disconnecting.

Syntax

def get_max_retransmits() -> int: ...
def set_max_retransmits(value: int) -> None: ...

max_retransmits = property(get_max_retransmits, set_max_retransmits)

Default Value

3

Remarks

This property allows you to specify the number of times that you would like to try re-sending the last data packet if the original packet fails.

The retransmit_timeout determines the wait time (in seconds) between successive retransmissions.

The default value for the max_retransmits property is 3.

retransmit_timeout Property

Maximum time in seconds to wait for a reply packet from the server before retransmitting the last packet.

Syntax

def get_retransmit_timeout() -> int: ...
def set_retransmit_timeout(value: int) -> None: ...

retransmit_timeout = property(get_retransmit_timeout, set_retransmit_timeout)

Default Value

5

Remarks

Please refer to the max_retransmits property for the number of retransmit efforts before an error is returned.

The default value for the retransmit_timeout is 5 seconds.

timeout Property

A timeout for the class.

Syntax

def get_timeout() -> int: ...
def set_timeout(value: int) -> None: ...

timeout = property(get_timeout, set_timeout)

Default Value

60

Remarks

If the timeout property is set to 0, all operations will run uninterrupted until successful completion or an error condition is encountered.

If timeout is set to a positive value, the class will wait for the operation to complete before returning control.

The class will use do_events to enter an efficient wait loop during any potential waiting period, making sure that all system events are processed immediately as they arrive. This ensures that the host application does not "freeze" and remains responsive.

If timeout expires, and the operation is not yet complete, the class fails with an error.

Please note that by default, all timeouts are inactivity timeouts, i.e. the timeout period is extended by timeout seconds when any amount of data is successfully sent or received.

The default value for the timeout property is 60 seconds.

config Method

Sets or retrieves a configuration setting.

Syntax

def config(configuration_string: str) -> str: ...

Remarks

config is a generic method available in every class. It is used to set and retrieve configuration settings for the class.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, access to these internal properties is provided through the config method.

To set a configuration setting named PROPERTY, you must call Config("PROPERTY=VALUE"), where VALUE is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).

To read (query) the value of a configuration setting, you must call Config("PROPERTY"). The value will be returned as a string.

do_events Method

Processes events from the internal message queue.

Syntax

def do_events() -> None: ...

Remarks

When do_events is called, the class processes any available events. If no events are available, it waits for a preset period of time, and then returns.

start_listening Method

This method starts listening for incoming connections.

Syntax

def start_listening() -> None: ...

Remarks

This method begins listening for incoming connections on the port specified by local_port. Once listening, events will fire as new clients connect and data are transferred.

To stop listening for new connections, call stop_listening. To stop listening for new connections and to disconnect all existing clients, call shutdown.

stop_listening Method

This method stops listening for new connections.

Syntax

def stop_listening() -> None: ...

Remarks

This method stops listening for new connections. After being called, any new connection attempts will be rejected. Calling this method does not disconnect existing connections.

To stop listening and to disconnect all existing clients, call shutdown instead.

on_connected Event

This event fires immediately after a connection completes (or fails).

Syntax

class TFTPServerConnectedEventParams(object):
  @property
  def connection_id() -> int: ...

  @property
  def status_code() -> int: ...

  @property
  def description() -> str: ...

# In class TFTPServer:
@property
def on_connected() -> Callable[[TFTPServerConnectedEventParams], None]: ...
@on_connected.setter
def on_connected(event_hook: Callable[[TFTPServerConnectedEventParams], None]) -> None: ...

Remarks

The ConnectionId is the Id of the connected client that caused the event to fire.

Upon a successful connection, the SatusCode is 0, and the Description is "OK." If the connection is not successful, the StatusCode will contain the error code. The Description will contain a textual description of the error. For a list of valid error codes and their descriptions, please refer to the Error Codes section.

on_connection_request Event

This event fires anytime a connected client attempts a connection to the server.

Syntax

class TFTPServerConnectionRequestEventParams(object):
  @property
  def remote_host() -> str: ...

  @property
  def remote_port() -> int: ...

  @property
  def filename() -> str: ...

  @property
  def transfer_mode() -> str: ...

  @property
  def operation() -> int: ...

  @property
  def accept() -> bool: ...
  @accept.setter
  def accept(value) -> None: ...

# In class TFTPServer:
@property
def on_connection_request() -> Callable[[TFTPServerConnectionRequestEventParams], None]: ...
@on_connection_request.setter
def on_connection_request(event_hook: Callable[[TFTPServerConnectionRequestEventParams], None]) -> None: ...

Remarks

The RemoteHost parameter specifies the IP address (IP number in dotted internet format) of the client attempting to connect.

The RemotePort is the port of the client attempting a connection.

The Filename parameter is the path of the file to upload or download.

The TransferMode parameter specifies which transfer mode to use.

The Operation indicates whether the requested operation is read or write.

The Accept parameter indicates whether to accept or deny the connection. All connections are accepted by default. If you want to refuse a connection, set the Accept parameter to false.

on_disconnected Event

This event fires after a transfer is completed.

Syntax

class TFTPServerDisconnectedEventParams(object):
  @property
  def connection_id() -> int: ...

  @property
  def status_code() -> int: ...

  @property
  def description() -> str: ...

# In class TFTPServer:
@property
def on_disconnected() -> Callable[[TFTPServerDisconnectedEventParams], None]: ...
@on_disconnected.setter
def on_disconnected(event_hook: Callable[[TFTPServerDisconnectedEventParams], None]) -> None: ...

Remarks

ConnectionID will be the ConnectionID of the client that has disconnected.

Upon successful transfer and disconnection, the StatusCode will be 0 and the Description will be "OK." If a transfer is unsuccessful or a client disconnects due to an error, the StatusCode will contain the error code. The Description will be a textual description of the error.

on_end_transfer Event

This event fires once a transfer is completed.

Syntax

class TFTPServerEndTransferEventParams(object):
  @property
  def connection_id() -> int: ...

  @property
  def direction() -> int: ...

# In class TFTPServer:
@property
def on_end_transfer() -> Callable[[TFTPServerEndTransferEventParams], None]: ...
@on_end_transfer.setter
def on_end_transfer(event_hook: Callable[[TFTPServerEndTransferEventParams], None]) -> None: ...

Remarks

The ConnectionId will be the the ConnectionId of the connected client.

The Direction parameter shows whether the client (0) or the server (1) is sending the data.

on_error Event

Fired when information is available about errors during data delivery.

Syntax

class TFTPServerErrorEventParams(object):
  @property
  def error_code() -> int: ...

  @property
  def description() -> str: ...

# In class TFTPServer:
@property
def on_error() -> Callable[[TFTPServerErrorEventParams], None]: ...
@on_error.setter
def on_error(event_hook: Callable[[TFTPServerErrorEventParams], None]) -> None: ...

Remarks

The on_error event is fired in case of exceptional conditions during message processing. Normally the class fails with an error.

The ErrorCode parameter contains an error code, and the Description parameter contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the Error Codes section.

on_log Event

This event fires once for each log message.

Syntax

class TFTPServerLogEventParams(object):
  @property
  def connection_id() -> int: ...

  @property
  def log_level() -> int: ...

  @property
  def message() -> str: ...

  @property
  def log_type() -> str: ...

# In class TFTPServer:
@property
def on_log() -> Callable[[TFTPServerLogEventParams], None]: ...
@on_log.setter
def on_log(event_hook: Callable[[TFTPServerLogEventParams], None]) -> None: ...

Remarks

This event fires once for each log message generated by the class. The verbosity is controlled by the LogLevel setting.

LogLevel indicates the level of message. Possible values are as follows:

The value 1 (Info) logs basic information, including users logging in and out, files transferred, and directories listed.

The value 2 (Verbose) includes logs from the on_pi_trail event as well as basic information about data transfer channels.

The value 3 (Debug) logs additional debug information, such as extended socket connection and data transfer information.

Message is the log entry.

LogType identifies the type of log entry. Possible values are as follows:

• "Info"
• "Error"
• "Verbose"
• "Debug"
• "PITrail"

on_start_transfer Event

This event fires immediately after a client initiates a file transfer.

Syntax

class TFTPServerStartTransferEventParams(object):
  @property
  def connection_id() -> int: ...

  @property
  def direction() -> int: ...

# In class TFTPServer:
@property
def on_start_transfer() -> Callable[[TFTPServerStartTransferEventParams], None]: ...
@on_start_transfer.setter
def on_start_transfer(event_hook: Callable[[TFTPServerStartTransferEventParams], None]) -> None: ...

Remarks

ConnectionId is the ConnectionId of the connected client. Direction represents the direction in which the transfer is going.

on_transfer Event

This event fires repeatedly while data is being transferred. A transfer is marked as complete once a packet that is less than 512 bytes is received.

Syntax

class TFTPServerTransferEventParams(object):
  @property
  def connection_id() -> int: ...

  @property
  def direction() -> int: ...

  @property
  def bytes_transferred() -> int: ...

  @property
  def percent_done() -> int: ...

  @property
  def text() -> bytes: ...

# In class TFTPServer:
@property
def on_transfer() -> Callable[[TFTPServerTransferEventParams], None]: ...
@on_transfer.setter
def on_transfer(event_hook: Callable[[TFTPServerTransferEventParams], None]) -> None: ...

Remarks

The ConnectionId parameter is the ConnectionId of the client who initiated the transfer.

BytesTransferred specifies the number of bytes transferred.

The Text parameter contains the data being transferred.

The Direction parameter shows whether the client (0) or the server (1) is sending the data.

The PercentDone parameter shows the progress of the transfer in the corresponding direction. If PercentDone can not be calculated the value will be -1.

Note: Events are not re-entrant. Performing time-consuming operations within this event will prevent it from firing again in a timely manner and may affect overall performance.

TFTPServer Config Settings

The class accepts one or more of the following configuration settings. Configuration settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, access to these internal properties is provided through the config method.

TFTPServer Config Settings

UDP Config Settings

Socket Config Settings

Base Config Settings

TFTPServer Errors

TFTPServer Errors

	122   Packet too large.
	123   Wrong response type from server.
	124   Server error. Description contains detailed information.
	125   Invalid server response.
	126   A valid LocalFile must be provided for PUT operations.
	127   Can't open local file.
	128   Can't write to local file.
	129   Can't read local file.
	130   Busy performing the current transfer.
	301   Timeout while waiting for server.
	305   Server error.
	306   Wrong or invalid response type received from server.
	307   Invalid response from server.

The class may also return one of the following error codes, which are inherited from other classes.

UDP Errors

	104   UDP is already active.
	106   You cannot change the local_port while the class is active.
	107   You cannot change the local_host at this time. A connection is in progress.
	109   The class must be active for this operation.
	112   Cannot change MaxPacketSize while the class is active.
	113   Cannot change ShareLocalPort option while the class is active.
	114   Cannot change remote_host when UseConnection is set and the class active.
	115   Cannot change remote_port when UseConnection is set and the class is active.
	116   remote_port can't be zero when UseConnection is set. Please specify a valid service port number.
	117   Cannot change UseConnection while the class is active.
	118   Message can't be longer than MaxPacketSize.
	119   Message too short.
	434   Unable to convert string to selected CodePage

SSL Errors

	270   Cannot load specified security library.
	271   Cannot open certificate store.
	272   Cannot find specified certificate.
	273   Cannot acquire security credentials.
	274   Cannot find certificate chain.
	275   Cannot verify certificate chain.
	276   Error during handshake.
	280   Error verifying certificate.
	281   Could not find client certificate.
	282   Could not find server certificate.
	283   Error encrypting data.
	284   Error decrypting data.

TCP/IP Errors

	10004   [10004] Interrupted system call.
	10009   [10009] Bad file number.
	10013   [10013] Access denied.
	10014   [10014] Bad address.
	10022   [10022] Invalid argument.
	10024   [10024] Too many open files.
	10035   [10035] Operation would block.
	10036   [10036] Operation now in progress.
	10037   [10037] Operation already in progress.
	10038   [10038] Socket operation on non-socket.
	10039   [10039] Destination address required.
	10040   [10040] Message too long.
	10041   [10041] Protocol wrong type for socket.
	10042   [10042] Bad protocol option.
	10043   [10043] Protocol not supported.
	10044   [10044] Socket type not supported.
	10045   [10045] Operation not supported on socket.
	10046   [10046] Protocol family not supported.
	10047   [10047] Address family not supported by protocol family.
	10048   [10048] Address already in use.
	10049   [10049] Can't assign requested address.
	10050   [10050] Network is down.
	10051   [10051] Network is unreachable.
	10052   [10052] Net dropped connection or reset.
	10053   [10053] Software caused connection abort.
	10054   [10054] Connection reset by peer.
	10055   [10055] No buffer space available.
	10056   [10056] Socket is already connected.
	10057   [10057] Socket is not connected.
	10058   [10058] Can't send after socket shutdown.
	10059   [10059] Too many references, can't splice.
	10060   [10060] Connection timed out.
	10061   [10061] Connection refused.
	10062   [10062] Too many levels of symbolic links.
	10063   [10063] File name too long.
	10064   [10064] Host is down.
	10065   [10065] No route to host.
	10066   [10066] Directory not empty
	10067   [10067] Too many processes.
	10068   [10068] Too many users.
	10069   [10069] Disc Quota Exceeded.
	10070   [10070] Stale NFS file handle.
	10071   [10071] Too many levels of remote in path.
	10091   [10091] Network subsystem is unavailable.
	10092   [10092] WINSOCK DLL Version out of range.
	10093   [10093] Winsock not loaded yet.
	11001   [11001] Host not found.
	11002   [11002] Non-authoritative 'Host not found' (try again or check DNS setup).
	11003   [11003] Non-recoverable errors: FORMERR, REFUSED, NOTIMP.
	11004   [11004] Valid name, no data record (check DNS setup).