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

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

#disable_output ⇒ Object

Whether or not output has been disabled.



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# File 'lib/rex/ui/text/shell.rb', line 318

def disable_output
  @disable_output
end

#framework ⇒ Object

Returns the value of attribute framework.



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# File 'lib/rex/ui/text/shell.rb', line 330

def framework
  @framework
end

#input ⇒ Object

The input handle to read user input from.



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# File 'lib/rex/ui/text/shell.rb', line 322

def input
  @input
end

#on_command_proc ⇒ Object

Returns the value of attribute on_command_proc.



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# File 'lib/rex/ui/text/shell.rb', line 328

def on_command_proc
  @on_command_proc
end

#on_print_proc ⇒ Object

Returns the value of attribute on_print_proc.



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# File 'lib/rex/ui/text/shell.rb', line 329

def on_print_proc
  @on_print_proc
end

#output ⇒ Object

The output handle to write output to.



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# File 'lib/rex/ui/text/shell.rb', line 326

def output
  @output
end

Instance Method Details

#init_tab_complete ⇒ Object 



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# File 'lib/rex/ui/text/shell.rb', line 57

def init_tab_complete
	if (self.input and self.input.supports_readline)
		self.input = Input::Readline.new(lambda { |str| tab_complete(str) })
		if Readline::HISTORY.length == 0 and histfile and File.exists?(histfile)
			File.readlines(histfile).each { |e|
				Readline::HISTORY << e.chomp
			}
			self.hist_last_saved = Readline::HISTORY.length
		end
		self.input.output = self.output
		update_prompt(input.prompt)
	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 74

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
	update_prompt('')
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 41

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.init_prompt = prompt
	self.prompt_char = prompt_char

	self.histfile = histfile
	self.hist_last_saved = 0

	self.framework = framework
end

#print(msg = '') ⇒ Object

Prints a raw message to the output handle.



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# File 'lib/rex/ui/text/shell.rb', line 309

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

#print_error(msg = '') ⇒ Object

Prints an error message to the output handle.



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# File 'lib/rex/ui/text/shell.rb', line 268

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

#print_good(msg = '') ⇒ Object

Prints a good message to the output handle.



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

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

#print_line(msg = '') ⇒ Object

Prints a line of text to the output handle.



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# File 'lib/rex/ui/text/shell.rb', line 299

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

#print_status(msg = '') ⇒ Object

Prints a status message to the output handle.



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

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

#reset_ui ⇒ Object

Resets the user interface handles.



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# File 'lib/rex/ui/text/shell.rb', line 94

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 122

def run(&block)

	begin

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

			init_tab_complete

			if framework
				if input.prompt.include?("%T")
					t = Time.now
					if framework.datastore['PromptTimeFormat']
						t = t.strftime(framework.datastore['PromptTimeFormat'])
					end
					input.prompt.gsub!(/%T/, t.to_s)
				end

				if input.prompt.include?("%H")
					hostname = ENV['HOSTNAME']
					if hostname.nil?
						hostname = `hostname`.split('.')[0]
					end

					# check if hostname is still nil
					if hostname.nil?
						hostname = ENV['COMPUTERNAME']
					end

					if hostname.nil?
						hostname = 'unknown'
					end

					input.prompt.gsub!(/%H/, hostname.chomp)
				end

				if input.prompt.include?("%U")
					user = ENV['USER']
					if user.nil?
						user = `whoami`
					end

					# check if username is still nil
					if user.nil?
						user = ENV['USERNAME']
					end

					if user.nil?
						user = 'unknown'
					end

					input.prompt.gsub!(/%U/, user.chomp)
				end

				input.prompt.gsub!(/%S/, framework.sessions.length.to_s)
				input.prompt.gsub!(/%J/, framework.jobs.length.to_s)
				input.prompt.gsub!(/%L/, Rex::Socket.source_address("50.50.50.50"))
				input.prompt.gsub!(/%D/, ::Dir.getwd)
				self.init_prompt = input.prompt
			end

			line = input.pgets()
			log_output(input.prompt)

			# If a block was passed in, pass the line to it.  If it returns true,
			# break out of the shell loop.
			if (block)
				break if (line == nil or block.call(line))
			elsif(input.eof? or line == nil)
			# If you have sessions active, this will give you a shot to exit gravefully
			# If you really are ambitious, 2 eofs will kick this out
				self.stop_count += 1
				next if(self.stop_count > 1)
				run_single("quit")
			else
			# Otherwise, call what should be an overriden instance method to
			# process the line.
				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
				if ret and self.histfile
					File.open(self.histfile, "a+") { |f|
						f.puts(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 101

def set_log_source(log_source)
	self.log_source = log_source
end

#stop ⇒ Object

Stop processing user input.



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# File 'lib/rex/ui/text/shell.rb', line 222

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 229

def stopped?
	self.stop_flag
end

#tab_complete(str) ⇒ Object

Performs tab completion on the supplied string.



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# File 'lib/rex/ui/text/shell.rb', line 115

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

#unset_log_source ⇒ Object

Unsets the log source so that logging becomes disabled.



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# File 'lib/rex/ui/text/shell.rb', line 108

def unset_log_source
	set_log_source(nil)
end

#update_prompt(prompt = nil, new_prompt_char = nil, mode = false) ⇒ Object

Change the input prompt.

prompt - the actual prompt new_prompt_char the char to append to the prompt mode - append or not to append - false = append true = make a new prompt



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# File 'lib/rex/ui/text/shell.rb', line 239

def update_prompt(prompt = nil, new_prompt_char = nil, mode = false)
	if (self.input)
		if prompt
			new_prompt = self.init_prompt + ' ' + prompt + prompt_char + ' '
		else
			new_prompt = self.prompt || ''
		end

		if mode
		  new_prompt = prompt + (new_prompt_char || prompt_char) + ' '
		end

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

		# 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(new_prompt)
		self.prompt_char  = new_prompt_char if (new_prompt_char)
	end
end