Module: Rex::Ui::Text::Shell

Includes:
Text::Color
Included in:
DispatcherShell, PseudoShell
Defined in:
lib/rex/ui/text/shell.rb

Overview

The shell class provides a command-prompt style interface in a generic fashion.

Defined Under Namespace

Modules: InputShell

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#cont_flagObject (protected)

:nodoc:


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# File 'lib/rex/ui/text/shell.rb', line 487

def cont_flag
  @cont_flag
end

#cont_promptObject (protected)

:nodoc:


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# File 'lib/rex/ui/text/shell.rb', line 482

def cont_prompt
  @cont_prompt
end

#disable_outputObject

Whether or not output has been disabled.


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# File 'lib/rex/ui/text/shell.rb', line 279

def disable_output
  @disable_output
end

#frameworkObject

Returns the value of attribute framework


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# File 'lib/rex/ui/text/shell.rb', line 292

def framework
  @framework
end

#hist_last_savedObject

the number of history lines when last saved/loaded


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# File 'lib/rex/ui/text/shell.rb', line 293

def hist_last_saved
  @hist_last_saved
end

#histfileObject (protected)

:nodoc:


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# File 'lib/rex/ui/text/shell.rb', line 484

def histfile
  @histfile
end

#inputObject

The input handle to read user input from.


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# File 'lib/rex/ui/text/shell.rb', line 283

def input
  @input
end

#local_hostnameObject (protected)

:nodoc:


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# File 'lib/rex/ui/text/shell.rb', line 486

def local_hostname
  @local_hostname
end

#local_usernameObject (protected)

:nodoc:


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# File 'lib/rex/ui/text/shell.rb', line 486

def local_username
  @local_username
end

#log_sourceObject (protected)

:nodoc:


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# File 'lib/rex/ui/text/shell.rb', line 485

def log_source
  @log_source
end

#on_command_procObject

Returns the value of attribute on_command_proc


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# File 'lib/rex/ui/text/shell.rb', line 290

def on_command_proc
  @on_command_proc
end

#on_print_procObject

Returns the value of attribute on_print_proc


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# File 'lib/rex/ui/text/shell.rb', line 291

def on_print_proc
  @on_print_proc
end

#outputObject

The output handle to write output to.


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# File 'lib/rex/ui/text/shell.rb', line 287

def output
  @output
end

#promptObject

Returns the value of attribute prompt


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# File 'lib/rex/ui/text/shell.rb', line 289

def prompt
  @prompt
end

#prompt_charObject

Returns the value of attribute prompt_char


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# File 'lib/rex/ui/text/shell.rb', line 289

def prompt_char
  @prompt_char
end

#stop_countObject (protected)

:nodoc:


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# File 'lib/rex/ui/text/shell.rb', line 485

def stop_count
  @stop_count
end

#stop_flagObject (protected)

:nodoc:


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# File 'lib/rex/ui/text/shell.rb', line 482

def stop_flag
  @stop_flag
end

#tab_complete_procObject (protected)

:nodoc:


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# File 'lib/rex/ui/text/shell.rb', line 483

def tab_complete_proc
  @tab_complete_proc
end

Instance Method Details

#_print_prompt(prompt) ⇒ Object (protected)

Print the prompt, but do not log it.


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# File 'lib/rex/ui/text/shell.rb', line 361

def _print_prompt(prompt)
  output.print(prompt)
end

#format_prompt(str) ⇒ Object (protected)

Handle prompt substitutions


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# File 'lib/rex/ui/text/shell.rb', line 394

def format_prompt(str)
  return str unless framework

  # find the active session
  session = framework.sessions.values.find { |session| session.interacting }
  default = 'unknown'

  formatted = ''
  skip_next = false
  for prefix, spec in str.split('').each_cons(2) do
    if skip_next
      skip_next = false
      next
    end

    unless prefix == '%'
      formatted << prefix
      skip_next = false
      next
    end

    skip_next = true
    if spec == 'T'
      # This %T is the strftime shorthand for %H:%M:%S
      strftime_format = framework.datastore['PromptTimeFormat'] || '%T'
      formatted << Time.now.strftime(strftime_format).to_s
    elsif spec == 'W' && framework.db.active
      formatted << framework.db.workspace.name
    elsif session
      sysinfo = session.respond_to?(:sys) ? session.sys.config.sysinfo : nil

      case spec
      when 'A'
        formatted << (sysinfo.nil? ? default : sysinfo['Architecture'])
      when 'D'
        formatted << (session.respond_to?(:fs) ? session.fs.dir.getwd(refresh: false) : default)
      when 'd'
        formatted << ::Dir.getwd
      when 'H'
        formatted << (sysinfo.nil? ? default : sysinfo['Computer'])
      when 'h'
        formatted << (self.local_hostname || default).chomp
      when 'I'
        formatted << session.tunnel_peer
      when 'i'
        formatted << session.tunnel_local
      when 'M'
        formatted << session.session_type
      when 'S'
        formatted << session.sid.to_s
      when 'U'
        formatted << (session.respond_to?(:sys) ? session.sys.config.getuid(refresh: false) : default)
      when 'u'
        formatted << (self.local_username || default).chomp
      else
        formatted << prefix
        skip_next = false
      end
    else
      case spec
      when 'H'
        formatted << (self.local_hostname || default).chomp
      when 'J'
        formatted << framework.jobs.length.to_s
      when 'U'
        formatted << (self.local_username || default).chomp
      when 'S'
        formatted << framework.sessions.length.to_s
      when 'L'
        formatted << Rex::Socket.source_address
      when 'D'
        formatted << ::Dir.getwd
      else
        formatted << prefix
        skip_next = false
      end
    end
  end

  if str.length > 0 && !skip_next
    formatted << str[-1]
  end

  formatted
end

#get_input_lineObject (protected)

Get a single line of input, following continuation directives as necessary.


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# File 'lib/rex/ui/text/shell.rb', line 304

def get_input_line
  line = "\\\n"
  prompt_needs_reset = false

  self.cont_flag = false
  while line =~ /(^|[^\\])\\\s*$/
    # Strip \ and all the trailing whitespace
    line.sub!(/\\\s*/, '')

    if line.length > 0
      # Using update_prompt will overwrite the primary prompt
      input.prompt = output.update_prompt(self.cont_prompt)
      self.cont_flag = true
      prompt_needs_reset = true
    end

    output.input = input
    str = input.pgets
    if str
      line << str
    else
      line = nil
    end

    output.input = nil
    log_output(input.prompt)
  end
  self.cont_flag = false

  if prompt_needs_reset
    # The continuation prompt was used so reset the prompt
    update_prompt
  end

  line
end

#init_tab_completeObject


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# File 'lib/rex/ui/text/shell.rb', line 66

def init_tab_complete
  if (self.input and self.input.supports_readline)
    # Unless cont_flag because there's no tab complete for continuation lines
    self.input = Input::Readline.new(lambda { |str| tab_complete(str) unless cont_flag })
    if Readline::HISTORY.length == 0 and histfile and File.exist?(histfile)
      File.readlines(histfile).each { |e|
        Readline::HISTORY << e.chomp
      }
      self.hist_last_saved = Readline::HISTORY.length
    end
    self.input.output = self.output
  end
end

#init_ui(in_input = nil, in_output = nil) ⇒ Object

Initializes the user interface input/output classes.


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# File 'lib/rex/ui/text/shell.rb', line 83

def init_ui(in_input = nil, in_output = nil)
  # Initialize the input and output methods
  self.input  = in_input
  self.output = in_output

  if (self.input)
    # Extend the input medium as an input shell if the input medium
    # isn't intrinsicly a shell.
    if (self.input.intrinsic_shell? == false)
      self.input.extend(InputShell)
    end

    self.input.output = self.output
  end
end

#initialize(prompt, prompt_char = '>', histfile = nil, framework = nil) ⇒ Object

Initializes a shell that has a prompt and can be interacted with.


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# File 'lib/rex/ui/text/shell.rb', line 44

def initialize(prompt, prompt_char = '>', histfile = nil, framework = nil)
  # Set the stop flag to false
  self.stop_flag      = false
  self.disable_output = false
  self.stop_count     = 0

  # Initialize the prompt
  self.cont_prompt = ' > '
  self.cont_flag = false
  self.prompt = prompt
  self.prompt_char = prompt_char

  self.histfile = histfile
  self.hist_last_saved = 0

  # Static prompt variables
  self.local_hostname = ENV['HOSTNAME'] || `hostname`.split('.')[0] || ENV['COMPUTERNAME']
  self.local_username = ENV['USER'] || `whoami` || ENV['USERNAME']

  self.framework = framework
end

#log_input(buf) ⇒ Object (protected)

Writes the supplied input to the log source if one has been registered.


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# File 'lib/rex/ui/text/shell.rb', line 368

def log_input(buf)
  rlog(buf, log_source) if (log_source)
end

#log_output(buf) ⇒ Object (protected)

Writes the supplied output to the log source if one has been registered.


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# File 'lib/rex/ui/text/shell.rb', line 375

def log_output(buf)
  rlog(buf, log_source) if (log_source)
end

#parse_line(line) ⇒ Object (protected)

Parse a line into an array of arguments.


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# File 'lib/rex/ui/text/shell.rb', line 344

def parse_line(line)
  log_input(line)

  line.gsub!(/(\r|\n)/, '')

  begin
    return args = Rex::Parser::Arguments.from_s(line)
  rescue ::ArgumentError
    print_error("Parse error: #{$!}")
  end

  return []
end

Prints a raw message to the output handle.


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# File 'lib/rex/ui/text/shell.rb', line 270

def print(msg='')
  return if (disable_output == true)
  self.on_print_proc.call(msg) if self.on_print_proc
  log_output(output.print(msg))
end

Prints an error message to the output handle.


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# File 'lib/rex/ui/text/shell.rb', line 216

def print_error(msg='')
  return if (output.nil?)
  return if (msg.nil?)

  self.on_print_proc.call(msg) if self.on_print_proc
  # Errors are not subject to disabled output
  log_output(output.print_error(msg))
end

Prints a good message to the output handle.


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# File 'lib/rex/ui/text/shell.rb', line 240

def print_good(msg='')
  return if (disable_output == true)

  self.on_print_proc.call(msg) if self.on_print_proc
  log_output(output.print_good(msg))
end

Prints a line of text to the output handle.


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# File 'lib/rex/ui/text/shell.rb', line 250

def print_line(msg='')
  return if (disable_output == true)

  self.on_print_proc.call(msg) if self.on_print_proc
  log_output(output.print_line(msg))
end

Prints a status message to the output handle.


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# File 'lib/rex/ui/text/shell.rb', line 230

def print_status(msg='')
  return if (disable_output == true)

  self.on_print_proc.call(msg) if self.on_print_proc
  log_output(output.print_status(msg))
end

Prints a warning message to the output handle.


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# File 'lib/rex/ui/text/shell.rb', line 260

def print_warning(msg='')
  return if (disable_output == true)

  self.on_print_proc.call(msg) if self.on_print_proc
  log_output(output.print_warning(msg))
end

#prompt_yesno(query) ⇒ Object (protected)

Prompt the user for input if possible. Special edition for use inside commands.


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# File 'lib/rex/ui/text/shell.rb', line 382

def prompt_yesno(query)
  p = "#{query} [y/N]"
  old_p = [self.prompt, self.prompt_char]
  update_prompt p, ' '
  /^y/i === get_input_line
ensure
  update_prompt *old_p
end

#reset_uiObject

Resets the user interface handles.


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# File 'lib/rex/ui/text/shell.rb', line 102

def reset_ui
  init_ui
end

#run(&block) ⇒ Object

Run the command processing loop.


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# File 'lib/rex/ui/text/shell.rb', line 130

def run(&block)

  begin

    while true
      # If the stop flag was set or we've hit EOF, break out
      break if self.stop_flag || self.stop_count > 1

      init_tab_complete
      update_prompt

      line = get_input_line

      # If you have sessions active, this will give you a shot to exit
      # gracefully. If you really are ambitious, 2 eofs will kick this out
      if input.eof? || line == nil
        self.stop_count += 1
        next if self.stop_count > 1
        run_single("quit")

      # If a block was passed in, pass the line to it.  If it returns true,
      # break out of the shell loop.
      elsif block
        break if block.call(line)

      # Otherwise, call what should be an overriden instance method to
      # process the line.
      else
        ret = run_single(line)
        # don't bother saving lines that couldn't be found as a
        # command, create the file if it doesn't exist, don't save dupes
        if ret && self.histfile && line != @last_line
          File.open(self.histfile, "a+") { |f| f.puts(line) }
          @last_line = line
        end
        self.stop_count = 0
      end

    end
  # Prevent accidental console quits
  rescue ::Interrupt
    output.print("Interrupt: use the 'exit' command to quit\n")
    retry
  end
end

#set_log_source(log_source) ⇒ Object

Sets the log source that should be used for logging input and output.


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# File 'lib/rex/ui/text/shell.rb', line 109

def set_log_source(log_source)
  self.log_source = log_source
end

#stopObject

Stop processing user input.


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# File 'lib/rex/ui/text/shell.rb', line 179

def stop
  self.stop_flag = true
end

#stopped?Boolean

Checks to see if the shell has stopped.

Returns:

  • (Boolean)

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# File 'lib/rex/ui/text/shell.rb', line 186

def stopped?
  self.stop_flag
end

#supports_color?Boolean (protected)

Returns:

  • (Boolean)

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# File 'lib/rex/ui/text/shell.rb', line 297

def supports_color?
  true
end

#tab_complete(str) ⇒ Object

Performs tab completion on the supplied string.


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# File 'lib/rex/ui/text/shell.rb', line 123

def tab_complete(str)
  return tab_complete_proc(str) if (tab_complete_proc)
end

#unset_log_sourceObject

Unsets the log source so that logging becomes disabled.


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# File 'lib/rex/ui/text/shell.rb', line 116

def unset_log_source
  set_log_source(nil)
end

#update_prompt(new_prompt = self.prompt, new_prompt_char = self.prompt_char) ⇒ Object

Change the input prompt.

prompt - the actual prompt new_prompt_char the char to append to the prompt


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# File 'lib/rex/ui/text/shell.rb', line 195

def update_prompt(new_prompt = self.prompt, new_prompt_char = self.prompt_char)
  if (self.input)
    p = substitute_colors(new_prompt + ' ' + new_prompt_char + ' ', true)

    # Save the prompt before any substitutions
    self.prompt = new_prompt
    self.prompt_char  = new_prompt_char

    # Set the actual prompt to the saved prompt with any substitutions
    # or updates from our output driver, be they color or whatever
    self.input.prompt = self.output.update_prompt(format_prompt(p))
  end
end