Also store the server_guid value

Author: zeroSteiner

lib/ruby_smb/client.rb

@@ -233,6 +233,11 @@ class Client
     #     (constants defined in RubySMB::SMB2::CompressionCapabilities)
     attr_accessor :server_compression_algorithms
 
+    # The GUID of the server (SMB 2.x and 3.x).
+    # @!attribute [rw] server_guid
+    #   @return [String]
+    attr_accessor :server_guid
+
     # The server's start time if it is reported as part of the negotiation
     # process (SMB 2.x and 3.x). This value is nil if the server does not report
     # it (reports a value of 0).

lib/ruby_smb/client/negotiation.rb

@@ -26,6 +26,7 @@ def negotiate
         end
 
         if response_packet && %w{0x0202 0x0210 0x0300 0x0302 0x0311 0x02ff}.include?(@dialect)
+          @server_guid = response_packet.server_guid
           if response_packet.server_start_time != 0
             @server_start_time = response_packet.server_start_time.to_time
           end

lib/ruby_smb/smb2/packet/negotiate_response.rb

@@ -15,7 +15,7 @@ class NegotiateResponse < RubySMB::GenericPacket
         uint16              :dialect_revision,          label: 'Dialect Revision'
         uint16              :negotiate_context_count,   label: 'Negotiate Context Count', initial_value: -> { negotiate_context_list.size }, onlyif: -> { has_negotiate_context? }
         uint16              :reserved1,                 label: 'Reserved', initial_value: 0, onlyif: -> { !has_negotiate_context? }
-        string              :server_guid,               label: 'Server GUID',                  length: 16
+        string              :server_guid,               label: 'Server GUID', length: 16
         smb2_capabilities   :capabilities
         uint32              :max_transact_size,         label: 'Max Transaction Size'
         uint32              :max_read_size,             label: 'Max Read Size'