class Net::SSH::Test::Packet

This is an abstract class, not to be instantiated directly, subclassed by Net::SSH::Test::LocalPacket and Net::SSH::Test::RemotePacket. It implements functionality common to those subclasses.

These packets are not true packets, in that they don't represent what was actually sent between the hosst; rather, they represent what was expected to be sent, as dictated by the script (Net::SSH::Test::Script). Thus, though they are defined with data elements, these data elements are used to either validate data that was sent by the local host (Net::SSH::Test::LocalPacket) or to mimic the sending of data by the remote host (Net::SSH::Test::RemotePacket).

Public Class Methods

new(type, *args) click to toggle source

Ceate a new packet of the given type, and with args being a list of data elements in the order expected for packets of the given type (see types).

# File lib/net/ssh/test/packet.rb, line 36
def initialize(type, *args)
  @type = self.class.const_get(type.to_s.upcase)
  @data = args
end

register_channel_request(request, extra_parts) click to toggle source

# File lib/net/ssh/test/packet.rb, line 24
def self.register_channel_request(request, extra_parts)
  @registered_requests ||= {}
  @registered_requests[request] = { extra_parts: extra_parts }
end

registered_channel_requests(request) click to toggle source

# File lib/net/ssh/test/packet.rb, line 29
def self.registered_channel_requests(request)
  @registered_requests && @registered_requests[request]
end

Public Instance Methods

instantiate!() click to toggle source

Instantiates the packets data elements. When the packet was first defined, some elements may not have been fully realized, and were described as Proc objects rather than atomic types. This invokes those Proc objects and replaces them with their returned values. This allows for values like Net::SSH::Test::Channel#remote_id to be used in scripts before the remote_id is known (since it is only known after a channel has been confirmed open).

# File lib/net/ssh/test/packet.rb, line 58
def instantiate!
  @data.map! { |i| i.respond_to?(:call) ? i.call : i }
end

local?() click to toggle source

The default for local? is false. Subclasses should override as necessary.

# File lib/net/ssh/test/packet.rb, line 47
def local?
  false
end

remote?() click to toggle source

The default for remote? is false. Subclasses should override as necessary.

# File lib/net/ssh/test/packet.rb, line 42
def remote?
  false
end

types() click to toggle source

Returns an array of symbols describing the data elements for packets of the same type as this packet. These types are used to either validate sent packets (Net::SSH::Test::LocalPacket) or build received packets (Net::SSH::Test::RemotePacket).

Not all packet types are defined here. As new packet types are required (e.g., a unit test needs to test that the remote host sent a packet that is not implemented here), the description of that packet should be added. Unsupported packet types will otherwise raise an exception.

# File lib/net/ssh/test/packet.rb, line 71
def types
  @types ||= case @type
             when KEXINIT then
               %[long long long long
                  string string string string string string string string string string
                  bool]
             when NEWKEYS then []
             when CHANNEL_OPEN then %[string long long long]
             when CHANNEL_OPEN_CONFIRMATION then %[long long long long]
             when CHANNEL_DATA then %[long string]
             when CHANNEL_EXTENDED_DATA then %[long long string]
             when CHANNEL_EOF, CHANNEL_CLOSE, CHANNEL_SUCCESS, CHANNEL_FAILURE then [:long]
             when CHANNEL_REQUEST
               parts = %[long string bool]
               case @data[1]
               when "exec", "subsystem","shell" then parts << :string
               when "exit-status" then parts << :long
               when "pty-req" then parts.concat(%[string long long long long string])
               when "env" then parts.contact(%[string string])
               else
                 request = Packet.registered_channel_requests(@data[1])
                 raise "don't know what to do about #{@data[1]} channel request" unless request
                 parts.concat(request[:extra_parts])
               end
             else raise "don't know how to parse packet type #{@type}"
             end
end