Class: Net::SSH::Proxy::SOCKS5

Inherits:
Object
  • Object
show all
Defined in:
lib/net/ssh/proxy/socks5.rb

Overview

An implementation of a SOCKS5 proxy. To use it, instantiate it, then pass the instantiated object via the :proxy key to Net::SSH.start:

require 'net/ssh/proxy/socks5'

proxy = Net::SSH::Proxy::SOCKS5.new('proxy.host', proxy_port,
  :user => 'user', :password => "password")
Net::SSH.start('host', 'user', :proxy => proxy) do |ssh|
  ...
end

Constant Summary collapse

VERSION =

The SOCKS protocol version used by this class

5
METHOD_NO_AUTH =

The SOCKS authentication type for requests without authentication

0
METHOD_PASSWD =

The SOCKS authentication type for requests via username/password

2
METHOD_NONE =

The SOCKS authentication type for when there are no supported authentication methods.

0xFF
CMD_CONNECT =

The SOCKS packet type for requesting a proxy connection.

1
ATYP_IPV4 =

The SOCKS address type for connections via IP address.

1
ATYP_DOMAIN =

The SOCKS address type for connections via domain name.

3
SUCCESS =

The SOCKS response code for a successful operation.

0

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(proxy_host, proxy_port = 1080, options = {}) ⇒ SOCKS5

Create a new proxy connection to the given proxy host and port. Optionally, :user and :password options may be given to identify the username and password with which to authenticate.


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# File 'lib/net/ssh/proxy/socks5.rb', line 57

def initialize(proxy_host, proxy_port=1080, options={})
  @proxy_host = proxy_host
  @proxy_port = proxy_port
  @options = options
end

Instance Attribute Details

#optionsObject (readonly)

The map of options given at initialization


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# File 'lib/net/ssh/proxy/socks5.rb', line 52

def options
  @options
end

#proxy_hostObject (readonly)

The proxy's host name or IP address


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# File 'lib/net/ssh/proxy/socks5.rb', line 46

def proxy_host
  @proxy_host
end

#proxy_portObject (readonly)

The proxy's port number


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# File 'lib/net/ssh/proxy/socks5.rb', line 49

def proxy_port
  @proxy_port
end

Instance Method Details

#open(host, port, connection_options = nil) ⇒ Object

Return a new socket connected to the given host and port via the proxy that was requested when the socket factory was instantiated.


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# File 'lib/net/ssh/proxy/socks5.rb', line 65

def open(host, port, connection_options = nil)
  socket = TCPSocket.new(proxy_host, proxy_port)

  methods = [METHOD_NO_AUTH]
  methods << METHOD_PASSWD if options[:user]

  packet = [VERSION, methods.size, *methods].pack("C*")
  socket.send packet, 0

  version, method = socket.recv(2).unpack("CC")
  if version != VERSION
    socket.close
    raise Net::SSH::Proxy::Error, "invalid SOCKS version (#{version})"
  end

  if method == METHOD_NONE
    socket.close
    raise Net::SSH::Proxy::Error, "no supported authorization methods"
  end

  negotiate_password(socket) if method == METHOD_PASSWD

  packet = [VERSION, CMD_CONNECT, 0].pack("C*")

  if host =~ /^(\d+)\.(\d+)\.(\d+)\.(\d+)$/
    packet << [ATYP_IPV4, $1.to_i, $2.to_i, $3.to_i, $4.to_i].pack("C*")
  else
    packet << [ATYP_DOMAIN, host.length, host].pack("CCA*")
  end

  packet << [port].pack("n")
  socket.send packet, 0
  
  version, reply, = socket.recv(2).unpack("C*")
  socket.recv(1)
  address_type = socket.recv(1).getbyte(0)
  case address_type
  when 1
    socket.recv(4)  # get four bytes for IPv4 address
  when 3
    len = socket.recv(1).getbyte(0)
    hostname = socket.recv(len)
  when 4
    ipv6addr hostname = socket.recv(16)
  else
    socket.close
    raise ConnectError, "Illegal response type"
  end
  portnum = socket.recv(2)
  
  unless reply == SUCCESS
    socket.close
    raise ConnectError, "#{reply}"
  end

  return socket
end