71 lines
2.1 KiB
Ruby
71 lines
2.1 KiB
Ruby
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require 'socket'
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require 'resolv'
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require 'ipaddr'
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require 'net/ssh/proxy/errors'
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module Net
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module SSH
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module Proxy
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# An implementation of a SOCKS4 proxy. To use it, instantiate it, then
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# pass the instantiated object via the :proxy key to Net::SSH.start:
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#
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# require 'net/ssh/proxy/socks4'
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#
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# proxy = Net::SSH::Proxy::SOCKS4.new('proxy.host', proxy_port, :user => 'user')
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# Net::SSH.start('host', 'user', :proxy => proxy) do |ssh|
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# ...
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# end
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class SOCKS4
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# The SOCKS protocol version used by this class
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VERSION = 4
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# The packet type for connection requests
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CONNECT = 1
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# The status code for a successful connection
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GRANTED = 90
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# The proxy's host name or IP address, as given to the constructor.
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attr_reader :proxy_host
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# The proxy's port number.
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attr_reader :proxy_port
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# The additional options that were given to the proxy's constructor.
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attr_reader :options
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# Create a new proxy connection to the given proxy host and port.
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# Optionally, a :user key may be given to identify the username
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# with which to authenticate.
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def initialize(proxy_host, proxy_port=1080, options={})
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@proxy_host = proxy_host
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@proxy_port = proxy_port
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@options = options
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end
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# Return a new socket connected to the given host and port via the
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# proxy that was requested when the socket factory was instantiated.
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def open(host, port)
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socket = TCPSocket.new(proxy_host, proxy_port)
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ip_addr = IPAddr.new(Resolv.getaddress(host))
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packet = [VERSION, CONNECT, port.to_i, ip_addr.to_i, options[:user]].pack("CCnNZ*")
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socket.send packet, 0
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version, status, port, ip = socket.recv(8).unpack("CCnN")
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if status != GRANTED
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socket.close
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raise ConnectError, "error connecting to proxy (#{status})"
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end
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return socket
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end
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end
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end
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end
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end
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