Class: RubySMB::SMB1::File

Inherits:
Object
  • Object
show all
Defined in:
lib/ruby_smb/smb1/file.rb

Overview

Represents a file on the Remote server that we can perform various I/O operations on.

Direct Known Subclasses

Pipe

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(tree:, response:, name:) ⇒ File

Returns a new instance of File.

Raises:

  • (ArgumentError) 


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# File 'lib/ruby_smb/smb1/file.rb', line 51

def initialize(tree:, response:, name:)
  raise ArgumentError, 'No tree provided' if tree.nil?
  raise ArgumentError, 'No response provided' if response.nil?
  raise ArgumentError, 'No file name provided' if name.nil?

  @tree = tree
  @name = name

  @attributes   = response.parameter_block.ext_file_attributes
  @fid          = response.parameter_block.fid
  @last_access  = response.parameter_block.last_access_time.to_datetime
  @last_change  = response.parameter_block.last_change_time.to_datetime
  @last_write   = response.parameter_block.last_write_time.to_datetime
  @size         = response.parameter_block.end_of_file
  @size_on_disk = response.parameter_block.allocation_size
end

Instance Attribute Details

#attributes ⇒ RubySMB::SMB1::BitField::SmbExtFileAttributes

Returns:



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# File 'lib/ruby_smb/smb1/file.rb', line 19

def attributes
  @attributes
end

#fid ⇒ Integer

Returns:

  • (Integer) 


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# File 'lib/ruby_smb/smb1/file.rb', line 24

def fid
  @fid
end

#last_access ⇒ DateTime

Returns:

  • (DateTime) 


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# File 'lib/ruby_smb/smb1/file.rb', line 29

def last_access
  @last_access
end

#last_change ⇒ DateTime

Returns:

  • (DateTime) 


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# File 'lib/ruby_smb/smb1/file.rb', line 34

def last_change
  @last_change
end

#last_write ⇒ DateTime

Returns:

  • (DateTime) 


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# File 'lib/ruby_smb/smb1/file.rb', line 39

def last_write
  @last_write
end

#name ⇒ String

Returns:

  • (String) 


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# File 'lib/ruby_smb/smb1/file.rb', line 14

def name
  @name
end

#size ⇒ Integer

Returns:

  • (Integer) 


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# File 'lib/ruby_smb/smb1/file.rb', line 44

def size
  @size
end

#size_on_disk ⇒ Integer

Returns:

  • (Integer) 


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# File 'lib/ruby_smb/smb1/file.rb', line 49

def size_on_disk
  @size_on_disk
end

#tree ⇒ RubySMB::SMB1::Tree

Returns:



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# File 'lib/ruby_smb/smb1/file.rb', line 9

def tree
  @tree
end

Instance Method Details

#append(data:) ⇒ WindowsError::ErrorCode

Appends the supplied data to the end of the file.

Parameters:

  • data (String) —

    the data to write to the file

Returns:

  • (WindowsError::ErrorCode) —

    the NTStatus code returned from the operation



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# File 'lib/ruby_smb/smb1/file.rb', line 72

def append(data:)
  write(data: data, offset: @size)
end

#close ⇒ WindowsError::ErrorCode

Closes the handle to the remote file.

Returns:

  • (WindowsError::ErrorCode) —

    the NTStatus code returned by the operation

Raises:



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# File 'lib/ruby_smb/smb1/file.rb', line 81

def close
  close_request = set_header_fields(RubySMB::SMB1::Packet::CloseRequest.new)
  raw_response  = @tree.client.send_recv(close_request)
  response = RubySMB::SMB1::Packet::CloseResponse.read(raw_response)
  unless response.smb_header.command == RubySMB::SMB1::Commands::SMB_COM_CLOSE
    raise RubySMB::Error::InvalidPacket, 'Not a CloseResponse packet'
  end
  unless response.status_code == WindowsError::NTStatus::STATUS_SUCCESS
    raise RubySMB::Error::UnexpectedStatusCode, response.status_code.name
  end
  response.status_code
end

#delete ⇒ WindowsError::ErrorCode

Delete a file on close

Returns:

  • (WindowsError::ErrorCode) —

    the NTStatus Response code



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# File 'lib/ruby_smb/smb1/file.rb', line 168

def delete
  raw_response = @tree.client.send_recv(delete_packet)
  response = RubySMB::SMB1::Packet::Trans2::SetFileInformationResponse.read(raw_response)
  response.status_code
end

#delete_packet ⇒ RubySMB::SMB1::Packet::Trans2::SetFileInformationRequest

Crafts the SetFileInformationRequest packet to be sent for delete operations.

Returns:



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# File 'lib/ruby_smb/smb1/file.rb', line 177

def delete_packet
  delete_request = RubySMB::SMB1::Packet::Trans2::SetFileInformationRequest.new
  delete_request = @tree.set_header_fields(delete_request)
  delete_request.data_block.trans2_parameters.fid = @fid
  passthrough_info_level = RubySMB::Fscc::FileInformation::FILE_DISPOSITION_INFORMATION +
    RubySMB::Fscc::FileInformation::SMB_INFO_PASSTHROUGH
  delete_request.data_block.trans2_parameters.information_level = passthrough_info_level
  delete_request.data_block.trans2_data.info_level_struct.delete_pending = 1
  set_trans2_params(delete_request)
end

#read(bytes: @size, offset: 0) ⇒ String

Read from the file, a specific number of bytes from a specific offset. If no parameters are given it will read the entire file.

Parameters:

  • bytes (Integer) (defaults to: @size) —

    the number of bytes to read

  • offset (Integer) (defaults to: 0) —

    the byte offset in the file to start reading from

Returns:

  • (String) —

    the data read from the file

Raises:



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# File 'lib/ruby_smb/smb1/file.rb', line 103

def read(bytes: @size, offset: 0)
  atomic_read_size = if bytes > @tree.client.max_buffer_size
                       @tree.client.max_buffer_size
                     else
                       bytes
                     end
  remaining_bytes = bytes
  data = ''

  loop do
    read_request = read_packet(read_length: atomic_read_size, offset: offset)
    raw_response = @tree.client.send_recv(read_request)
    response = RubySMB::SMB1::Packet::ReadAndxResponse.read(raw_response)
    unless response.smb_header.command == RubySMB::SMB1::Commands::SMB_COM_READ_ANDX
      raise RubySMB::Error::InvalidPacket, 'Not a ReadAndxResponse packet'
    end
    unless response.status_code == WindowsError::NTStatus::STATUS_SUCCESS
      raise RubySMB::Error::UnexpectedStatusCode, response.status_code.name
    end

    if response.is_a?(RubySMB::SMB1::Packet::ReadAndxResponse)
      data << response.data_block.data.to_binary_s
    else
      # Returns the current data immediately if we got an empty packet with an
      # SMB_COM_READ_ANDX command and a STATUS_SUCCESS (just in case)
      return data
    end

    remaining_bytes -= atomic_read_size
    break unless remaining_bytes > 0

    offset += atomic_read_size
    atomic_read_size = remaining_bytes if remaining_bytes < @tree.client.max_buffer_size
  end

  data
end

#read_packet(read_length: 0, offset: 0) ⇒ RubySMB::SMB1::Packet::ReadAndxRequest

Crafts the ReadRequest packet to be sent for read operations.

Parameters:

  • bytes (Integer) —

    the number of bytes to read

  • offset (Integer) (defaults to: 0) —

    the byte offset in the file to start reading from

Returns:



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# File 'lib/ruby_smb/smb1/file.rb', line 146

def read_packet(read_length: 0, offset: 0)
  read_request = set_header_fields(RubySMB::SMB1::Packet::ReadAndxRequest.new)
  read_request.parameter_block.max_count_of_bytes_to_return = read_length
  read_request.parameter_block.offset = offset
  read_request
end

#rename(new_file_name) ⇒ WindowsError::ErrorCode

Rename a file

Parameters:

  • new_file_name (String) —

    the new name

Returns:

  • (WindowsError::ErrorCode) —

    the NTStatus Response code



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# File 'lib/ruby_smb/smb1/file.rb', line 251

def rename(new_file_name)
  raw_response = tree.client.send_recv(rename_packet(new_file_name))
  response = RubySMB::SMB1::Packet::Trans2::SetFileInformationResponse.read(raw_response)
  response.status_code
end

#rename_packet(new_file_name) ⇒ RubySMB::SMB1::Packet::Trans2::SetFileInformationRequest

Crafts the SetFileInformationRequest packet to be sent for rename operations.

Parameters:

  • new_file_name (String) —

    the new name

Returns:



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# File 'lib/ruby_smb/smb1/file.rb', line 261

def rename_packet(new_file_name)
  rename_request = RubySMB::SMB1::Packet::Trans2::SetFileInformationRequest.new
  rename_request = @tree.set_header_fields(rename_request)
  rename_request.data_block.trans2_parameters.fid = @fid
  passthrough_info_level = RubySMB::Fscc::FileInformation::FILE_RENAME_INFORMATION +
    RubySMB::Fscc::FileInformation::SMB_INFO_PASSTHROUGH
  rename_request.data_block.trans2_parameters.information_level = passthrough_info_level
  rename_request.data_block.trans2_data.info_level_struct.file_name = new_file_name.encode('utf-16le')
  set_trans2_params(rename_request)
end

#send_recv_read(read_length: 0, offset: 0) ⇒ Object 



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# File 'lib/ruby_smb/smb1/file.rb', line 153

def send_recv_read(read_length: 0, offset: 0)
  read_request = read_packet(read_length: read_length, offset: offset)
  raw_response = tree.client.send_recv(read_request)

  response = RubySMB::SMB1::Packet::ReadAndxResponse.read(raw_response)
  unless response.status_code == WindowsError::NTStatus::STATUS_SUCCESS
    raise RubySMB::Error::UnexpectedStatusCode, response.status_code.name
  end

  response.data_block.data.to_binary_s
end

#send_recv_write(data: '', offset: 0) ⇒ Object 



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# File 'lib/ruby_smb/smb1/file.rb', line 239

def send_recv_write(data:'', offset: 0)
  pkt = write_packet(data: data, offset: offset)
  pkt.set_64_bit_offset(true)
  raw_response = @tree.client.send_recv(pkt)
  response = RubySMB::SMB1::Packet::WriteAndxResponse.read(raw_response)
  response.parameter_block.count_low
end

#set_header_fields(request) ⇒ RubySMB::GenericPacket

Sets the header fields that we have to set on every packet we send for File operations.

Parameters:

Returns:



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# File 'lib/ruby_smb/smb1/file.rb', line 277

def set_header_fields(request)
  request = @tree.set_header_fields(request)
  request.parameter_block.fid = @fid
  request
end

#write(data:, offset: 0) ⇒ Integer

Write the supplied data to the file at the given offset.

Parameters:

  • data (String) —

    the data to write to the file

  • offset (Integer) (defaults to: 0) —

    the offset in the file to start writing from

Returns:

  • (Integer) —

    the count of bytes written

Raises:



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# File 'lib/ruby_smb/smb1/file.rb', line 195

def write(data:, offset: 0)
  buffer = data.dup
  bytes  = data.length
  total_bytes_written = 0

  loop do
    atomic_write_size = if bytes > @tree.client.max_buffer_size
                         @tree.client.max_buffer_size
                        else
                          bytes
                        end
    write_request = write_packet(data: buffer.slice!(0, atomic_write_size), offset: offset)
    raw_response = @tree.client.send_recv(write_request)
    response = RubySMB::SMB1::Packet::WriteAndxResponse.read(raw_response)
    unless response.smb_header.command == RubySMB::SMB1::Commands::SMB_COM_WRITE_ANDX
      raise RubySMB::Error::InvalidPacket, 'Not a WriteAndxResponse packet'
    end
    unless response.status_code == WindowsError::NTStatus::STATUS_SUCCESS
      raise RubySMB::Error::UnexpectedStatusCode, response.status_code.name
    end
    bytes_written = response.parameter_block.count_low + (response.parameter_block.count_high << 16)
    total_bytes_written += bytes_written
    offset += bytes_written
    bytes -= bytes_written
    break unless buffer.length > 0
  end

  total_bytes_written
end

#write_packet(data: '', offset: 0) ⇒ RubySMB::SMB1::Packet::WriteAndxRequest

Creates the Request packet for the #write command

Parameters:

  • data (String) (defaults to: '') —

    the data to write to the file

  • offset (Integer) (defaults to: 0) —

    the offset in the file to start writing from

Returns:



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# File 'lib/ruby_smb/smb1/file.rb', line 230

def write_packet(data:'', offset: 0)
  write_request = set_header_fields(RubySMB::SMB1::Packet::WriteAndxRequest.new)
  write_request.parameter_block.offset = offset
  write_request.parameter_block.write_mode.writethrough_mode = 1
  write_request.data_block.data = data
  write_request.parameter_block.remaining = write_request.parameter_block.data_length
  write_request
end