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|
# frozen_string_literal: true
module HTTPX
class Socks5Error < ProxyError; end
module Plugins
module Proxy
module Socks5
VERSION = 5
NOAUTH = 0
PASSWD = 2
NONE = 0xff
CONNECT = 1
IPV4 = 1
DOMAIN = 3
IPV6 = 4
SUCCESS = 0
Error = Socks5Error
class << self
def load_dependencies(*)
require_relative "../auth/socks5"
end
def extra_options(options)
options.merge(supported_proxy_protocols: options.supported_proxy_protocols + %w[socks5])
end
end
module ConnectionMethods
def call
super
return unless @options.proxy && @options.proxy.uri.scheme == "socks5"
case @state
when :connecting,
:negotiating,
:authenticating
consume
end
end
def connecting?
super || @state == :authenticating || @state == :negotiating
end
def interests
if @state == :connecting || @state == :authenticating || @state == :negotiating
return @write_buffer.empty? ? :r : :w
end
super
end
private
def handle_transition(nextstate)
return super unless @options.proxy && @options.proxy.uri.scheme == "socks5"
case nextstate
when :connecting
return unless @state == :idle
@io.connect
return unless @io.connected?
@write_buffer << Packet.negotiate(@options.proxy)
__socks5_proxy_connect
when :authenticating
return unless @state == :connecting
@write_buffer << Packet.authenticate(@options.proxy)
when :negotiating
return unless @state == :connecting || @state == :authenticating
req = @pending.first
request_uri = req.uri
@write_buffer << Packet.connect(request_uri)
when :connected
return unless @state == :negotiating
@parser = nil
end
log(level: 1) { "SOCKS5: #{nextstate}: #{@write_buffer.to_s.inspect}" } unless nextstate == :open
super
end
def __socks5_proxy_connect
@parser = SocksParser.new(@write_buffer, @options)
@parser.on(:packet, &method(:__socks5_on_packet))
transition(:negotiating)
end
def __socks5_on_packet(packet)
case @state
when :connecting
version, method = packet.unpack("CC")
__socks5_check_version(version)
case method
when PASSWD
transition(:authenticating)
nil
when NONE
__on_socks5_error("no supported authorization methods")
else
transition(:negotiating)
end
when :authenticating
_, status = packet.unpack("CC")
return transition(:negotiating) if status == SUCCESS
__on_socks5_error("socks authentication error: #{status}")
when :negotiating
version, reply, = packet.unpack("CC")
__socks5_check_version(version)
__on_socks5_error("socks5 negotiation error: #{reply}") unless reply == SUCCESS
req = @pending.first
request_uri = req.uri
@io = ProxySSL.new(@io, request_uri, @options) if request_uri.scheme == "https"
transition(:connected)
throw(:called)
end
end
def __socks5_check_version(version)
__on_socks5_error("invalid SOCKS version (#{version})") if version != 5
end
def __on_socks5_error(message)
ex = Error.new(message)
ex.set_backtrace(caller)
on_error(ex)
throw(:called)
end
end
class SocksParser
include HTTPX::Callbacks
def initialize(buffer, options)
@buffer = buffer
@options = options
end
def close; end
def consume(*); end
def empty?
true
end
def <<(packet)
emit(:packet, packet)
end
end
module Packet
module_function
def negotiate(parameters)
methods = [NOAUTH]
methods << PASSWD if parameters.can_authenticate?
methods.unshift(methods.size)
methods.unshift(VERSION)
methods.pack("C*")
end
def authenticate(parameters)
parameters.authenticate
end
def connect(uri)
packet = [VERSION, CONNECT, 0].pack("C*")
begin
ip = IPAddr.new(uri.host)
ipcode = ip.ipv6? ? IPV6 : IPV4
packet << [ipcode].pack("C") << ip.hton
rescue IPAddr::InvalidAddressError
packet << [DOMAIN, uri.host.bytesize, uri.host].pack("CCA*")
end
packet << [uri.port].pack("n")
packet
end
end
end
end
register_plugin :"proxy/socks5", Proxy::Socks5
end
end
|
