Check if the app is run in python3 (#438)

Author: lucyoa

routersploit/core/exploit/shell.py

@@ -131,7 +131,7 @@ def shell(exploit, architecture="", method="", payloads=None, **params):
                     elf_binary = payload.generate_elf(data)
                     communication = Communication(exploit, elf_binary, options, **params)
                     if communication.wget() is False:
-                        print_error("Exploit failed to transfer payload") 
+                        print_error("Exploit failed to transfer payload")
                         continue
 
                 elif method == "echo":

rsf.py

@@ -1,9 +1,12 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import print_function
+import sys
+if sys.version_info.major < 3:
+    print("RouterSploit supports only Python3. Rerun application in Python3 environment.")
+    exit(0)
 
 import logging.handlers
-
 from routersploit.interpreter import RoutersploitInterpreter
 
 log_handler = logging.handlers.RotatingFileHandler(filename="routersploit.log", maxBytes=500000)