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require 'uri'
require 'net/ssh/proxy/command'
module Net
module SSH
module Proxy
# An implementation of a jump proxy. To use it, instantiate it,
# then pass the instantiated object via the :proxy key to
# Net::SSH.start:
#
# require 'net/ssh/proxy/jump'
#
# proxy = Net::SSH::Proxy::Jump.new('user@proxy')
# Net::SSH.start('host', 'user', :proxy => proxy) do |ssh|
# ...
# end
class Jump < Command
# The jump proxies
attr_reader :jump_proxies
# Create a new socket factory that tunnels via multiple jump proxes as
# [user@]host[:port].
def initialize(jump_proxies)
@jump_proxies = jump_proxies
end
# Return a new socket connected to the given host and port via the jump
# proxy that was requested when the socket factory was instantiated.
def open(host, port, connection_options = nil)
build_proxy_command_equivalent(connection_options)
super
end
# We cannot build the ProxyCommand template until we know if the :config
# option was specified during `Net::SSH.start`.
def build_proxy_command_equivalent(connection_options = nil)
first_jump, extra_jumps = jump_proxies.split(",", 2)
config = connection_options && connection_options[:config]
uri = URI.parse("ssh://#{first_jump}")
template = "ssh"
template << " -l #{uri.user}" if uri.user
template << " -p #{uri.port}" if uri.port
template << " -J #{extra_jumps}" if extra_jumps
template << " -F #{config}" if config != true && config
template << " -W %h:%p "
template << uri.host
@command_line_template = template
end
end
end
end
end
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