#!/usr/bin/env ruby

module Rex

###
#
# Base mixin for all exceptions that can be thrown from inside Rex.
#
###
module Exception
end

###
# 
# This exception is raised when a timeout occurs.
#
###
class TimeoutError < Interrupt
	include Exception

	def to_s
		"Operation timed out."
	end
end

###
#
# This exception is raised when a method is called or a feature is used that
# is not implemented.
#
###
class NotImplementedError < ::NotImplementedError
	include Exception

	def to_s
		"The requested method is not implemented."
	end
end

###
#
# This exception is raised when a generalized runtime error occurs.
#
###
class RuntimeError < ::RuntimeError
	include Exception
end

###
#
# This exception is raised when an invalid argument is supplied to a method.
#
###
class ArgumentError < ::ArgumentError
	include Exception
	
	def initialize(message = nil)
		@message = message
	end

	def to_s
		str = 'An invalid argument was specified.'
		if @message
			str += " #{@message}"
		end
		str
	end
end

###
#
# This exception is raised when an argument that was supplied to a method
# could not be parsed correctly.
#
###
class ArgumentParseError < ::ArgumentError
	include Exception

	def to_s
		"The argument could not be parsed correctly."
	end
end

###
#
# This exception is raised when an argument is ambiguous.
#
###
class AmbiguousArgumentError < ::RuntimeError
	include Exception

	def initialize(name = nil)
		@name = name
	end

	def to_s
		"The name #{@name} is ambiguous."
	end
end

###
#
# This error is thrown when a stream is detected as being closed.
#
###
class StreamClosedError < ::IOError
	include Exception

	def initialize(stream)
		@stream = stream
	end

	def stream
		@stream
	end

	def to_s
		"Stream #{@stream} is closed."
	end
end

##
#
# Socket exceptions
#
##

###
#
# This exception is raised when a general socket error occurs.
#
###
module SocketError
	include Exception

	def to_s
		"A socket error occurred."
	end
end

###
# 
# This exception is raised when there is some kind of error related to
# communication with a host.
#
###
module HostCommunicationError
	def initialize(addr = nil, port = nil)
		self.host = addr
		self.port = port
	end

	#
	# This method returns a printable address and port associated with the host
	# that triggered the exception.
	#
	def addr_to_s
		(host && port) ? " (#{host}:#{port})" : ""
	end

	attr_accessor :host, :port
end

###
#
# This exception is raised when a connection attempt fails because the remote
# side refused the connection.
#
###
class ConnectionRefused < ::IOError
	include SocketError
	include HostCommunicationError

	def to_s
		"The connection was refused by the remote host#{addr_to_s}."
	end
end

###
#
# This exception is raised when a connection attempt times out.
#
###
class ConnectionTimeout < ::Interrupt
	include SocketError
	include HostCommunicationError

	def to_s
		"The connection timed out#{addr_to_s}."
	end
end

###
#
# This exception is raised when an attempt to use an address or port that is
# already in use occurs, such as binding to a host on a given port that is
# already in use.
#
###
class AddressInUse < ::RuntimeError
	include SocketError
	include HostCommunicationError

	def to_s
		"The address is already in use#{addr_to_s}."
	end
end

###
#
# This exception is raised when an unsupported internet protocol is specified.
#
###
class UnsupportedProtocol < ::ArgumentError
	include SocketError

	def initialize(proto = nil)
		self.proto = proto
	end

	def to_s
		"The protocol #{proto} is not supported."	
	end

	attr_accessor :proto
end

end