Introduce a user-controlled timeout for SunRPC stuff

lib/msf/core/exploit/sunrpc.rb

@@ -38,6 +38,7 @@ module Exploit::Remote::SunRPC
 
     register_advanced_options(
       [
+        OptInt.new('TIMEOUT', [true, 'Number of seconds to wait for responses to RPC calls', 5])
         # XXX: Use portmapper to do call - Direct portmap to make the request to the program portmap_req
       ], Msf::Exploit::Remote::SunRPC)
 
@@ -50,12 +51,13 @@ module Exploit::Remote::SunRPC
     )
   end
 
-  def sunrpc_create(protocol, program, version)
+  def sunrpc_create(protocol, program, version, timeout = timeout)
     self.rpcobj = Rex::Proto::SunRPC::Client.new(
       :rhost => rhost,
       :rport => rport.to_i,
       :proto => protocol,
       :program => program,
+      :timeout => timeout,
       :version => version,
       :context => {
         'Msf'        => framework,
@@ -82,7 +84,7 @@ module Exploit::Remote::SunRPC
     rpcobj.pport = arr[5]
   end
 
-  def sunrpc_call(proc, buf, timeout=20)
+  def sunrpc_call(proc, buf, timeout = timeout)
     ret = rpcobj.call(proc, buf, timeout)
     raise ::Rex::Proto::SunRPC::RPCError, "#{rhost}:#{rport} - SunRPC - No response to SunRPC call for procedure: #{proc}" unless ret
 
@@ -157,6 +159,11 @@ module Exploit::Remote::SunRPC
     return "UNKNOWN-#{number}"
   end
 
+  # Returns the time that this module will wait for RPC responses, in seconds
+  def timeout
+    datastore['TIMEOUT']
+  end
+
   # Used to track the last SunRPC context
   attr_accessor	:rpcobj
 end