Nuuo mixin handle connection errors

lib/msf/core/exploit/nuuo.rb

@@ -43,7 +43,8 @@ module Exploit::Remote::Nuuo
       host: datastore['RHOST'],
       username: datastore['NCSUSER'],
       password: datastore['NCSPASS'],
-      user_session: datastore['NCSSESSION']
+      user_session: datastore['NCSSESSION'],
+      context: { 'Msf' => framework, 'MsfExploit' => self }
     })
 
     client.close if self.client && global
@@ -72,15 +73,29 @@ module Exploit::Remote::Nuuo
       print_status("Request:\r\n#{req.to_s}")
     end
 
-    conn = temp ? client.connect(temp: temp) : nil
-    res = client.send_recv(req, conn)
-    conn.shutdown if conn
+    begin
+      conn = temp ? client.connect(temp: temp) : nil
+      res = client.send_recv(req, conn)
+      if conn && temp
+        conn.shutdown
+        conn.close
+      end
 
-    if datastore['NCSTRACE'] && res
-      print_status("Response:\r\n#{res.to_s}")
+      if datastore['NCSTRACE'] && res
+        print_status("Response:\r\n#{res.to_s}")
+      end
+
+      res
+    rescue ::Errno::EPIPE, ::Timeout::Error => e
+      print_line(e.message) if datastore['NCSTRACE']
+      nil
+    rescue Rex::ConnectionError => e
+      vprint_error(e.to_s)
+      nil
+    rescue ::Exception => e
+      print_line(e.message) if datastore['NCSTRACE']
+      raise e
     end
-
-    res
   end
 
   def ncs_login