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import time
import sys
import os
python2_zmq_path = os.path.abspath(os.path.join(os.pardir,os.pardir,os.pardir,os.pardir,
os.pardir,'external_libs','pyzmq-14.5.0','python2','fedora18','64bit'))
stl_pathname = os.path.abspath(os.path.join(os.pardir, os.pardir))
sys.path.append(stl_pathname)
sys.path.append(python2_zmq_path)
import zmq
import inspect
from scapy_service import *
from argparse import *
import socket
class ParseException(Exception): pass
class InvalidRequest(Exception): pass
class MethodNotFound(Exception): pass
class InvalidParams(Exception): pass
class Scapy_wrapper:
def __init__(self):
self.scapy_master = Scapy_service()
def parse_req_msg(self,JSON_req):
try:
req = json.loads(JSON_req)
req_id='null'
if (type(req)!= type({})):
raise ParseException(req_id)
json_rpc_keys = ['jsonrpc','id','method']
if ((set(req.keys())!=set(json_rpc_keys)) and (set(req.keys())!=set(json_rpc_keys+['params']))) :
if 'id' in req.keys():
req_id = req['id']
raise InvalidRequest(req_id)
req_id = req['id']
if (req['method']=='shut_down'):
return 'shut_down',[],req_id
if not (self.scapy_master.supported_methods(req['method'])):
raise MethodNotFound(req_id)
scapy_method = eval("self.scapy_master."+req['method'])
arg_num_for_method = len(inspect.getargspec(scapy_method)[0])
if (arg_num_for_method>1) :
if not ('params' in req.keys()):
raise InvalidRequest(req_id)
params_len = len(req['params'])+1 # +1 because "self" is considered parameter in args for method
if not (params_len==arg_num_for_method):
raise InvalidParams(req_id)
return req['method'],req['params'],req_id
else:
return req['method'],[],req_id
except ValueError:
raise ParseException(req_id)
def create_error_response(self,error_code,error_msg,req_id='null'):
return {"jsonrpc": "2.0", "error": {"code": error_code, "message:": error_msg}, "id": req_id}
def create_success_response(self,result,req_id='null'):
return {"jsonrpc": "2.0", "result": result, "id": req_id }
def get_exception(self):
return sys.exc_info()
def execute(self,method,params):
if len(params)>0:
result = eval('self.scapy_master.'+method+'(*'+str(params)+')')
else:
result = eval('self.scapy_master.'+method+'()')
return result
def metaraise(self,exc_info):
raise exc_info[0], exc_info[1], exc_info[2]
def error_handler(self,exception_obj,req_id):
try:
self.metaraise(exception_obj)
except ParseException as e:
response = self.create_error_response(-32700,'Parse error ',req_id)
except InvalidRequest as e:
response = self.create_error_response(-32600,'Invalid Request',req_id)
except MethodNotFound as e:
response = self.create_error_response(-32601,'Method not found',req_id)
except InvalidParams as e:
response = self.create_error_response(-32603,'Invalid params',req_id)
except SyntaxError as e:
response = self.create_error_response(-32097,'SyntaxError',req_id)
except BaseException as e:
response = self.create_error_response(-32098,'Scapy Server: '+str(e.message),req_id)
except:
response = self.create_error_response(-32096,'Scapy Server: Unknown Error',req_id)
finally:
return response
#arg1 is port number for the server to listen to
def main(arg1=4507):
s = Scapy_server(arg1)
s.activate()
if __name__=='__main__':
if len(sys.argv)>1:
parser = ArgumentParser(description=' Runs Scapy Server ')
parser.add_argument('-s','--scapy-port',type=int, default = 4507, dest='scapy_port',
help='Select port to which Scapy Server will listen to.\n default is 4507\n',action='store')
args = parser.parse_args()
port = args.scapy_port
sys.exit(main(port))
else:
sys.exit(main())
class Scapy_server():
def __init__(self, port=4507):
self.scapy_wrapper = Scapy_wrapper()
self.port = port
self.context = zmq.Context()
self.socket = self.context.socket(zmq.REP)
self.socket.bind("tcp://*:"+str(port))
self.IP_address = socket.gethostbyname(socket.gethostname())
def activate(self):
print '***Scapy Server Started***\nListening on port: %d' % self.port
print 'Server IP address: %s' % self.IP_address
try:
while True:
message = self.socket.recv()
try:
method,params,req_id = self.scapy_wrapper.parse_req_msg(message)
if (method == 'shut_down'):
print 'Shut down by remote user'
result = 'Server shut down command received - server has shut down'
else:
result = self.scapy_wrapper.execute(method,params)
response = self.scapy_wrapper.create_success_response(result,req_id)
except Exception as e:
exception_details = self.scapy_wrapper.get_exception()
response = self.scapy_wrapper.error_handler(exception_details,req_id)
finally:
json_response = json.dumps(response)
# Send reply back to client
self.socket.send(json_response)
if (method =='shut_down'):
break
except KeyboardInterrupt:
print('Terminated By Ctrl+C')
finally:
self.socket.close()
self.context.destroy()
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