Class: ShadowsocksRuby::Protocols::HttpSimpleProtocol

Inherits:
Object
  • Object
show all
Includes:
BufferHelper, DummyHelper
Defined in:
lib/shadowsocks_ruby/protocols/obfs/http_simple.rb

Overview

Constant Summary collapse

USER_AGENTS =
["Mozilla/5.0 (Windows NT 6.3; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0",
"Mozilla/5.0 (Windows NT 6.3; WOW64; rv:40.0) Gecko/20100101 Firefox/44.0",
"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36",
"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.11 (KHTML, like Gecko) Ubuntu/11.10 Chromium/27.0.1453.93 Chrome/27.0.1453.93 Safari/537.36",
"Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0",
"Mozilla/5.0 (compatible; WOW64; MSIE 10.0; Windows NT 6.2)",
"Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/533.20.25 (KHTML, like Gecko) Version/5.0.4 Safari/533.20.27",
"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.3; Trident/7.0; .NET4.0E; .NET4.0C)",
"Mozilla/5.0 (Windows NT 6.3; Trident/7.0; rv:11.0) like Gecko",
"Mozilla/5.0 (Linux; Android 4.4; Nexus 5 Build/BuildID) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/30.0.0.0 Mobile Safari/537.36",
"Mozilla/5.0 (iPad; CPU OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A334 Safari/7534.48.3",
"Mozilla/5.0 (iPhone; CPU iPhone OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A334 Safari/7534.48.3"]

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from BufferHelper

#tcp_receive_from_localbackend_in_buffer, #tcp_receive_from_localbackend_other_packet_helper, #tcp_receive_from_remoteserver_in_buffer, #tcp_receive_from_remoteserver_other_packet_helper

Methods included from DummyHelper

#async_recv, #raise_me, #send_data

Constructor Details

#initialize(params = {}) ⇒ HttpSimpleProtocol

Returns a new instance of HttpSimpleProtocol.

Parameters:

  • params (Hash) (defaults to: {})

    Configuration parameters

Options Hash (params):

  • :host (String)

    shadowsocks server address, required by remoteserver protocol

  • :port (String)

    shadowsocks server port, required by remoteserver protocol

  • :compatible (Boolean)

    compatibility with origin mode, default true

  • :obfs_param (String)

    obfs param, optional


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# File 'lib/shadowsocks_ruby/protocols/obfs/http_simple.rb', line 32

def initialize params = {}
  @params = {:compatible => true }.merge(params)
  @buffer = ''
end

Instance Attribute Details

#next_protocolObject

Returns the value of attribute next_protocol


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# File 'lib/shadowsocks_ruby/protocols/obfs/http_simple.rb', line 12

def next_protocol
  @next_protocol
end

Instance Method Details

#async_recv_until(str) ⇒ Object


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# File 'lib/shadowsocks_ruby/protocols/obfs/http_simple.rb', line 166

def async_recv_until str
  @next_protocol.async_recv_until str
end

#get_data_from_http_header(buf) ⇒ Object

helpers


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# File 'lib/shadowsocks_ruby/protocols/obfs/http_simple.rb', line 158

def get_data_from_http_header buf
  [buf.split("\r\n")[0][/(%..)+/].gsub(/%/,'')].pack("H*")
end

#get_host_from_http_header(buf) ⇒ Object


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# File 'lib/shadowsocks_ruby/protocols/obfs/http_simple.rb', line 162

def get_host_from_http_header buf
  buf[/^Host: (.+):/,1]
end

#tcp_receive_from_localbackend_first_packet(n) ⇒ Object Also known as: tcp_receive_from_localbackend


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# File 'lib/shadowsocks_ruby/protocols/obfs/http_simple.rb', line 99

def tcp_receive_from_localbackend_first_packet n
  data = async_recv 10
  if (data =~ /^GET|^POST/) == nil
    if @params[:compatible]
      @buffer << data << async_recv(n - data.length)
    else
      raise PharseError, "not a valid http_simple first packet in strict mode"
    end
  else
    buf = ""
    buf << data << async_recv_until("\r\n\r\n")
    host = get_host_from_http_header(buf)
    if host != nil && @params[:obfs_param] != nil
      hosts = @params[:obfs_param]
      if hosts.include?('#')
        hosts, body = hosts.split('#')
        body = body.gsub(/\n/,"\r\n")
        body = body.gsub(/\\n/,"\r\n")
      end
      hosts = hosts.split(",") 
      if !hosts.include?(host)
        raise PharseError, "request host not in :obfs_param"
      end
    end
    ret_buf = get_data_from_http_header(buf)
    raise PharseError, "not a valid request" if ret_buf.length < 4
    @buffer << ret_buf
  end

  class << self
    alias tcp_receive_from_localbackend tcp_receive_from_localbackend_other_packet
  end
  tcp_receive_from_localbackend_other_packet_helper n
end

#tcp_receive_from_localbackend_other_packet(n) ⇒ Object


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# File 'lib/shadowsocks_ruby/protocols/obfs/http_simple.rb', line 136

def tcp_receive_from_localbackend_other_packet n
  async_recv(n)
end

#tcp_receive_from_remoteserver_first_packet(n) ⇒ Object Also known as: tcp_receive_from_remoteserver


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# File 'lib/shadowsocks_ruby/protocols/obfs/http_simple.rb', line 37

def tcp_receive_from_remoteserver_first_packet n
  class << self
    alias tcp_receive_from_remoteserver tcp_receive_from_remoteserver_other_packet
  end

  async_recv_until("\r\n\r\n")
  async_recv n
end

#tcp_receive_from_remoteserver_other_packet(n) ⇒ Object


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# File 'lib/shadowsocks_ruby/protocols/obfs/http_simple.rb', line 48

def tcp_receive_from_remoteserver_other_packet n
  async_recv n
end

#tcp_send_to_localbackend_first_packet(data) ⇒ Object Also known as: tcp_send_to_localbackend


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# File 'lib/shadowsocks_ruby/protocols/obfs/http_simple.rb', line 140

def tcp_send_to_localbackend_first_packet data
  class << self
    alias tcp_send_to_localbackend tcp_send_to_localbackend_other_packet
  end

  header = "HTTP/1.1 200 OK\r\nConnection: keep-alive\r\nContent-Encoding: gzip\r\nContent-Type: text/html\r\nDate: "
  header << Time.now.strftime('%a, %d %b %Y %H:%M:%S GMT')
  header << "\r\nServer: nginx\r\nVary: Accept-Encoding\r\n\r\n"
  send_data header << data
end

#tcp_send_to_localbackend_other_packet(data) ⇒ Object


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# File 'lib/shadowsocks_ruby/protocols/obfs/http_simple.rb', line 153

def tcp_send_to_localbackend_other_packet data
  send_data data
end

#tcp_send_to_remoteserver_first_packet(data) ⇒ Object Also known as: tcp_send_to_remoteserver

Raises:


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# File 'lib/shadowsocks_ruby/protocols/obfs/http_simple.rb', line 52

def tcp_send_to_remoteserver_first_packet data
  if data.length > 30 + 64
    headlen = 30 + Random.rand(64 + 1)
  else
    headlen = data.length
  end
  headdata = data.slice!(0, headlen)
  port = ''
  raise ProtocolError, "No :port params" if @params[:port] == nil
  if @params[:port] != 80
    port = ':' << @params[:port].to_s 
  end

  body = nil
  hosts = @params[:obfs_param] || @params[:host]
  raise ProtocolError, "No :host or :obfs_param parameters" if hosts == nil
  if hosts.include?('#')
    hosts, body = hosts.split('#')
    body = body.gsub(/\n/,"\r\n")
    body = body.gsub(/\\n/,"\r\n")
  end
  hosts = hosts.split(",")
  host = hosts[Random.rand(hosts.length)]

  http_head = "GET /" << headdata.unpack("H*")[0].gsub(/../,'%\0') << " HTTP/1.1\r\n"
  http_head << "Host: " << host << port << "\r\n"

  if body != nil
    http_head << body << "\r\n\r\n"
  else
    http_head << "User-Agent: " + USER_AGENTS[Random.rand(USER_AGENTS.length)] << "\r\n"
    http_head << "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\nAccept-Language: en-US,en;q=0.8\r\nAccept-Encoding: gzip, deflate\r\nDNT: 1\r\nConnection: keep-alive\r\n\r\n"
  end
  send_data(http_head << data)
  class << self
    alias tcp_send_to_remoteserver tcp_send_to_remoteserver_other_packet
  end

end

#tcp_send_to_remoteserver_other_packet(data) ⇒ Object


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# File 'lib/shadowsocks_ruby/protocols/obfs/http_simple.rb', line 94

def tcp_send_to_remoteserver_other_packet data
  send_data data
end