lib/ronin/support/network/tcp.rb
# frozen_string_literal: true
#
# Copyright (c) 2006-2023 Hal Brodigan (postmodern.mod3 at gmail.com)
#
# ronin-support is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# ronin-support is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with ronin-support. If not, see <https://www.gnu.org/licenses/>.
#
require 'ronin/support/network/tcp/proxy'
require 'ronin/support/network/dns/idn'
require 'socket'
require 'timeout'
module Ronin
module Support
module Network
#
# @since 1.0.0
#
module TCP
#
# Tests whether a remote TCP port is open.
#
# @param [String] host
# The host to connect to.
#
# @param [Integer] port
# The port to connect to.
#
# @param [Integer] timeout (5)
# The maximum time to attempt connecting.
#
# @param [Hash{Symbol => Object}] kwargs
# Additional keyword arguments for {connect}.
#
# @option kwargs [String, nil] bind_host
# The local host to bind to.
#
# @option kwargs [Integer, nil] bind_port
# The local port to bind to.
#
# @return [Boolean, nil]
# Specifies whether the remote TCP port is open.
# If the connection was not accepted, `nil` will be returned.
#
# @example
# open?('example.com',80)
# # => true
#
# @example Using a timeout:
# TCP.open?('example.com',1111, timeout: 5)
# # => nil
#
# @api public
#
# @since 0.5.0
#
def self.open?(host,port, timeout: 5, **kwargs)
Timeout.timeout(timeout) do
socket = connect(host,port,**kwargs)
socket.close
end
return true
rescue Timeout::Error
return nil
rescue SocketError, SystemCallError
return false
end
#
# Creates a new TCP socket connected to a given host and port.
#
# @param [String] host
# The host to connect to.
#
# @param [Integer] port
# The port to connect to.
#
# @param [String, nil] bind_host
# The local host to bind to.
#
# @param [Integer, nil] bind_port
# The local port to bind to.
#
# @yield [socket]
# If a block is given, it will be passed the newly created socket.
# Once the block returns the socket will be closed.
#
# @yieldparam [TCPsocket] socket
# The newly created TCP socket.
#
# @return [TCPSocket, nil]
# The newly created TCPSocket object. If a block is given a `nil`
# will be returned.
#
# @example
# TCP.connect('www.example.com',80)
# # => #<TCPSocket:fd 5, AF_INET, 192.168.122.165, 40364>
#
# @example
# TCP.connect('www.wired.com',80) do |socket|
# socket.write("GET /\n\n")
#
# puts socket.readlines
# end
#
# @see https://rubydoc.info/stdlib/socket/TCPSocket
#
# @api public
#
def self.connect(host,port, bind_host: nil, bind_port: nil)
host = DNS::IDN.to_ascii(host)
port = port.to_i
socket = if bind_host || bind_port
TCPSocket.new(host,port,bind_host.to_s,bind_port.to_i)
else
TCPSocket.new(host,port)
end
if block_given?
begin
yield socket
ensure
socket.close
end
else
return socket
end
end
#
# Creates a new TCPSocket object, connected to a given host and port.
# The given data will then be written to the newly created TCPSocket.
#
# @param [String] data
# The data to send through the connection.
#
# @param [String] host
# The host to connect to.
#
# @param [Integer] port
# The port to connect to.
#
# @param [Hash{Symbol => Object}] kwargs
# Additional keyword arguments for {connect}.
#
# @option kwargs [String, nil] :bind_host
# The local host to bind to.
#
# @option kwargs [Integer, nil] :bind_port
# The local port to bind to.
#
# @yield [socket]
# If a block is given, it will be passed the newly created socket.
#
# @yieldparam [TCPSocket] socket
# The newly created TCPSocket object.
#
# @return [TCPSocket]
# The newly created TCPSocket object.
#
# @api public
#
def self.connect_and_send(data,host,port,**kwargs)
socket = connect(host,port,**kwargs)
socket.write(data)
yield socket if block_given?
return socket
end
#
# Reads the banner from the service running on the given host and
# port.
#
# @param [String] host
# The host to connect to.
#
# @param [Integer] port
# The port to connect to.
#
# @param [Hash{Symbol => Object}] kwargs
# Additional keyword arguments for {connect}.
#
# @option kwargs [String] :bind_host
# The local host to bind to.
#
# @option kwargs [Integer] :bind_port
# The local port to bind to.
#
# @yield [banner]
# If a block is given, it will be passed the grabbed banner.
#
# @yieldparam [String] banner
# The grabbed banner.
#
# @return [String]
# The grabbed banner.
#
# @example
# TCP.banner('pop.gmail.com',25)
# # => "220 mx.google.com ESMTP c20sm3096959rvf.1"
#
# @api public
#
def self.banner(host,port,**kwargs)
banner = nil
connect(host,port,**kwargs) do |socket|
banner = socket.readline.strip
end
yield banner if block_given?
return banner
end
#
# Connects to a specified host and port, sends the given data and then
# closes the connection.
#
# @param [String] data
# The data to send through the connection.
#
# @param [String] host
# The host to connect to.
#
# @param [Integer] port
# The port to connect to.
#
# @param [Hash{Symbol => Object}] kwargs
# Additional keyword arguments for {connect}.
#
# @option kwargs [String] :bind_host
# The local host to bind to.
#
# @option kwargs [Integer] :bind_port
# The local port to bind to.
#
# @return [true]
# The data was successfully sent.
#
# @example
# buffer = "GET /" + ('A' * 4096) + "\n\r"
# TCP.send(buffer,'victim.com',80)
# # => true
#
# @api public
#
def self.send(data,host,port,**kwargs)
connect(host,port,**kwargs) do |socket|
socket.write(data)
end
return true
end
#
# Creates a new TCPServer listening on a given host and port.
#
# @param [Integer, nil] port
# The local port to listen on.
#
# @param [String, nil] host
# The host to bind to.
#
# @param [Integer] backlog
# The maximum backlog of pending connections.
#
# @yield [server]
# The block which will be called after the server has been created.
#
# @yieldparam [TCPServer] server
# The newly created TCP server.
#
# @return [TCPServer]
# The new TCP server.
#
# @example
# server = TCP.server(port: 1337)
#
# @see https://rubydoc.info/stdlib/socket/TCPServer
#
# @api public
#
def self.server(port: 0, host: nil, backlog: 5)
server = if host
TCPServer.new(host.to_s,port.to_i)
else
TCPServer.new(port.to_i)
end
server.listen(backlog)
yield server if block_given?
return server
end
#
# Creates a new temporary TCPServer listening on a host and port.
#
# @param [Hash{Symbol => Object}] kwargs
# Additional keyword arguments for {server}.
#
# @option kwargs [Integer, nil] :port (0)
# The local port to bind to.
#
# @option kwargs [String, nil] :host
# The host to bind to.
#
# @option kwargs [Integer] :backlog (5)
# The maximum backlog of pending connections.
#
# @yield [server]
# The block which will be called after the server has been created.
# After the block has finished, the server will be closed.
#
# @yieldparam [TCPServer] server
# The newly created TCP server.
#
# @return [nil]
#
# @example
# TCP.server_session(port: 1337) do |server|
# client1 = server.accept
# client2 = server.accept
#
# client2.write(server.read_line)
#
# client1.close
# client2.close
# end
#
# @api public
#
def self.server_session(**kwargs,&block)
server = server(**kwargs,&block)
server.close
return nil
end
#
# Creates a new TCPServer listening on a given host and port,
# accepting clients in a loop.
#
# @param [Hash{Symbol => Object}] kwargs
# Additional keyword arguments for {server}.
#
# @option kwargs [Integer, nil] :port (0)
# The local port to bind to.
#
# @option kwargs [String, nil] :host
# The host to bind to.
#
# @option kwargs [Integer] :backlog (5)
# The maximum backlog of pending connections.
#
# @yield [client]
# The given block will be passed the newly connected client.
# After the block has finished, the client will be closed.
#
# @yieldparam [TCPSocket] client
# A newly connected client.
#
# @return [nil]
#
# @example
# TCP.server_loop(port: 1337) do |client|
# client.puts 'lol'
# end
#
# @api public
#
# @since 0.5.0
#
def self.server_loop(**kwargs)
server_session(**kwargs) do |server|
loop do
client = server.accept
yield client if block_given?
client.close
end
end
end
#
# Creates a new TCPServer listening on a given host and port,
# accepts only one client and then stops listening.
#
# @param [Integer] backlog
# The maximum backlog of pending connections.
#
# @param [Hash{Symbol => Object}] kwargs
# Additional keyword arguments for {server}.
#
# @option kwargs [Integer, nil] :port
# The local port to bind to.
#
# @option kwargs [String, nil] :host
# The host to bind to.
#
# @yield [client]
# The given block will be passed the newly connected client.
# After the block has finished, both the client and the server
# will be closed.
#
# @yieldparam [TCPSocket] client
# The newly connected client.
#
# @return [nil]
#
# @example
# TCP.accept(port: 1337) do |client|
# client.puts 'lol'
# end
#
# @api public
#
# @since 0.5.0
#
def self.accept(backlog: 1, **kwargs)
server_session(backlog: backlog, **kwargs) do |server|
client = server.accept
yield client if block_given?
client.close
end
end
end
end
end
end