forked from eventmachine/eventmachine
/
socks5.rb
122 lines (109 loc) · 3.31 KB
/
socks5.rb
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module EventMachine
module Protocols
# Basic SOCKS v5 client implementation
#
# Use as you would any regular connection:
#
# class MyConn < EM::P::Socks5
# def post_init
# send_data("sup")
# end
#
# def receive_data(data)
# send_data("you said: #{data}")
# end
# end
#
# EM.connect socks_host, socks_port, MyConn, host, port
#
class Socks5 < Connection
def initialize(host, port)
@host = host
@port = port
@socks_error_code = nil
@buffer = ''
@socks_state = :method_negotiation
@socks_methods = [0] # TODO: other authentication methods
setup_methods
end
def setup_methods
class << self
def post_init; socks_post_init; end
def receive_data(*a); socks_receive_data(*a); end
end
end
def restore_methods
class << self
remove_method :post_init
remove_method :receive_data
end
end
def socks_post_init
packet = [5, @socks_methods.size].pack('CC') + @socks_methods.pack('C*')
send_data(packet)
end
def socks_receive_data(data)
@buffer << data
if @socks_state == :method_negotiation
return if @buffer.size < 2
header_resp = @buffer.slice! 0, 2
_, method_code = header_resp.unpack("cc")
if @socks_methods.include?(method_code)
@socks_state = :connecting
packet = [5, 1, 0].pack("C*")
if @host =~ /^(\d+)\.(\d+)\.(\d+)\.(\d+)$/ # IPv4
packet << [1, $1.to_i, $2.to_i, $3.to_i, $4.to_i].pack("C*")
elsif @host.include?(":") # IPv6
l, r = if @host =~ /^(.*)::(.*)$/
[$1,$2].map {|i| i.split ":"}
else
[@host.split(":"),[]]
end
dec_groups = (l + Array.new(8-l.size-r.size, '0') + r).map {|i| i.hex}
packet << ([4] + dec_groups).pack("Cn8")
else # Domain
packet << [3, @host.length, @host].pack("CCA*")
end
packet << [@port].pack("n")
send_data packet
else
@socks_state = :invalid
@socks_error_code = method_code
close_connection
return
end
elsif @socks_state == :connecting
return if @buffer.size < 4
header_resp = @buffer.slice! 0, 4
_, response_code, _, address_type = header_resp.unpack("C*")
if response_code == 0
case address_type
when 1
@buffer.slice! 0, 4
when 3
len = @buffer.slice! 0, 1
@buffer.slice! 0, len.unpack("C").first
when 4
@buffer.slice! 0, 16
else
@socks_state = :invalid
@socks_error_code = address_type
close_connection
return
end
@buffer.slice! 0, 2
@socks_state = :connected
restore_methods
post_init
receive_data(@buffer) unless @buffer.empty?
else
@socks_state = :invalid
@socks_error_code = response_code
close_connection
return
end
end
end
end
end
end