104 lines
3.1 KiB
Ruby
104 lines
3.1 KiB
Ruby
|
require "ipaddr"
|
||
|
|
require "proxifier/proxy"
|
||
|
|
|
||
|
|
module Proxifier
|
||
|
|
class SOCKSProxy < Proxy
|
||
|
|
VERSION = 0x05
|
||
|
|
|
||
|
|
def do_proxify(socket, host, port)
|
||
|
|
authenticaton_method = greet(socket)
|
||
|
|
authenticate(socket, authenticaton_method)
|
||
|
|
connect(socket, host, port)
|
||
|
|
end
|
||
|
|
|
||
|
|
protected
|
||
|
|
def greet(socket)
|
||
|
|
methods = authentication_methods
|
||
|
|
|
||
|
|
socket << [VERSION, methods.size, *methods].pack("CCC#{methods.size}")
|
||
|
|
version, authentication_method = socket.read(2).unpack("CC")
|
||
|
|
check_version(version)
|
||
|
|
|
||
|
|
authentication_method
|
||
|
|
end
|
||
|
|
|
||
|
|
def authenticate(socket, method)
|
||
|
|
case method
|
||
|
|
when 0x00 # NO AUTHENTICATION REQUIRED
|
||
|
|
when 0x02 # USERNAME/PASSWORD
|
||
|
|
user &&= user[0, 0xFF]
|
||
|
|
password &&= password[0, 0xFF]
|
||
|
|
|
||
|
|
socket << [user.size, user, password.size, password].pack("CA#{user.size}CA#{password.size}")
|
||
|
|
version, status = socket.read(2).unpack("CC")
|
||
|
|
check_version(version)
|
||
|
|
|
||
|
|
case status
|
||
|
|
when 0x00 # SUCCESS
|
||
|
|
else
|
||
|
|
raise "SOCKS5 username/password authentication failed"
|
||
|
|
end
|
||
|
|
else
|
||
|
|
raise "no acceptable SOCKS5 authentication methods"
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
def connect(socket, host, port)
|
||
|
|
host = host[0, 0xFF]
|
||
|
|
socket << [VERSION, 0x01, 0x00, 0x03, host.size, host, port].pack("CCCCCA#{host.size}n")
|
||
|
|
version, status, _, type = socket.read(4).unpack("CCCC")
|
||
|
|
check_version(version)
|
||
|
|
|
||
|
|
case status
|
||
|
|
when 0x00 # succeeded
|
||
|
|
when 0x01 # general SOCKS server failure
|
||
|
|
raise "general SOCKS server failure"
|
||
|
|
when 0x02 # connection not allowed by ruleset
|
||
|
|
raise "connection not allowed by ruleset"
|
||
|
|
when 0x03 # Network unreachable
|
||
|
|
raise "network unreachable"
|
||
|
|
when 0x04 # Host unreachable
|
||
|
|
raise "host unreachable"
|
||
|
|
when 0x05 # Connection refused
|
||
|
|
raise "connection refused"
|
||
|
|
when 0x06 # TTL expired
|
||
|
|
raise "TTL expired"
|
||
|
|
when 0x07 # Command not supported
|
||
|
|
raise "command not supported"
|
||
|
|
when 0x08 # Address type not supported
|
||
|
|
raise "address type not supported"
|
||
|
|
else # unassigned
|
||
|
|
raise "unknown SOCKS error"
|
||
|
|
end
|
||
|
|
|
||
|
|
case type
|
||
|
|
when 0x01 # IP V4 address
|
||
|
|
destination = IPAddr.ntop(socket.read(4))
|
||
|
|
when 0x03 # DOMAINNAME
|
||
|
|
length = socket.read(1).unpack("C").first
|
||
|
|
destination = socket.read(length).unpack("A#{length}")
|
||
|
|
when 0x04 # IP V6 address
|
||
|
|
destination = IPAddr.ntop(socket.read(16))
|
||
|
|
else
|
||
|
|
raise "unsupported SOCKS5 address type"
|
||
|
|
end
|
||
|
|
|
||
|
|
port = socket.read(2).unpack("n").first
|
||
|
|
end
|
||
|
|
|
||
|
|
def check_version(version, should_be = VERSION)
|
||
|
|
raise "mismatched SOCKS version" unless version == should_be
|
||
|
|
end
|
||
|
|
|
||
|
|
private
|
||
|
|
def authentication_methods
|
||
|
|
methods = []
|
||
|
|
methods << 0x00 # NO AUTHENTICATION REQUIRED
|
||
|
|
methods << 0x02 if user # USERNAME/PASSWORD
|
||
|
|
methods
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
SOCKS5Proxy = SOCKSProxy
|
||
|
|
end
|