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client.py
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client.py
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import socket
import sys
import random
import binascii
import json
import logging
import threading
import time
from optparse import OptionParser
usage = "usage: %prog -H host -P port [-R RID [-N nat-type] ]"
parser = OptionParser(usage=usage)
parser.add_option("-H", "--host", help="target's host", metavar="HOST",dest="host")
parser.add_option("-P", "--port", help="target's port default:%default", metavar="PORT",dest="port",default=9999,type=int)
parser.add_option("-R", "--rid", help="room's ID default:%default", metavar="ID",dest="rid",default=100)
parser.add_option("-N", "--nat-type", help="0:Full Cone 1:Restrict NAT 2:Restrict Port NAT 3:Symmetric NAT", metavar="NAT-TYPE(number)",dest="nat_type",default=None,type=int)
(opts, args) = parser.parse_args()
FullCone = "Full Cone" # 0
RestrictNAT = "Restrict NAT" # 1
RestrictPortNAT = "Restrict Port NAT" # 2
SymmetricNAT = "Symmetric NAT" # 3
UnknownNAT = "Unknown NAT" # 4
NATTYPE = (FullCone, RestrictNAT, RestrictPortNAT, SymmetricNAT, UnknownNAT)
class udpclient:
def __init__(self,host,port,rid,nat_type):
if nat_type != None:
self.nat_type=NATTYPE[nat_type]
else:
self.nat_type=self.get_nat_type()
self.rid=rid
self.serveraddress=(host,port)
self.clientsocket=socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
self.punch_target=self.target=None
self.rev_event=threading.Event()
self.connect_event=threading.Event()
self.chat_event=threading.Event()
def start(self,*args,**kargs):
print(self.nat_type)
data={
'command':'login',
'nat_type':self.nat_type,
'rid':self.rid,
}
self.clientsocket.sendto(str(data).encode(),self.serveraddress)
self.punch_target=self.serveraddress
self.punch()
res, _ =self.clientsocket.recvfrom(1024)
print(res)
try:
data=json.loads(res.decode().replace("'",'"'))
if "command" in data.keys():
command=data['command']
if command == "response":
try:
partner_nat_type=data['nat_type']
partner_address=(data['host'],data['port'])
except IndexError:
partner_nat_type=UnknownNAT
print("nat_type or rid not found")
sys.exit(0)
if partner_nat_type != SymmetricNAT and partner_nat_type != UnknownNAT and self.nat_type != SymmetricNAT and self.nat_type != UnknownNAT:
# if self.nat_type == FullCone:
self.punch_target=partner_address
self.chat(partner_address)
# elif self.nat_type == RestrictNAT or self.nat_type == RestrictPortNAT:
# self.chat(partner_address)
else:
print("Symmetric mode start")
self.chat(self.serveraddress,target_host=data['host'],target_port=data['port'])
except Exception as e:
print(e)
# trev_req.setDaemon(True)
# trev_req.start()
while True:
try:
time.sleep(0.5)
except KeyboardInterrupt:
print("exit")
sys.exit(0)
def chat(self,address,**kwargs):
print("chat starts")
ts = threading.Thread(target=self.send,args=(address,),kwargs=kwargs)
ts.setDaemon(True)
ts.start()
tr = threading.Thread(target=self.recv,args=(address,),kwargs=kwargs)
tr.setDaemon(True)
tr.start()
def send(self,address,**kwargs):
while True:
msg = sys.stdin.readline()
data={
'command':'msg',
'msg':msg,
}
# print(data)
# print(address)
if "target_host" in kwargs.keys() and "target_port" in kwargs.keys():
data['target_host'] = kwargs['target_host']
data['target_port'] = kwargs['target_port']
self.clientsocket.sendto(str(data).encode(), address)
def recv(self,address,**kwargs):
while True:
data, addr = self.clientsocket.recvfrom(1024)
# print(data,addr)
# print(self.serveraddress)
if addr == address or addr == self.serveraddress:
try:
data=json.loads(data.decode().replace("'",'"'))
if "command" in data.keys():
command = data['command']
if command == "msg":
# print("msg:")
sys.stdout.write(data['msg'])
except Exception as e:
print(e)
def error(self,*args,**kwargs):
print(args[0])
print('error')
def close(self,*args,**kwargs):
try:
self.clientsocket.close()
except Exception as e:
print(e)
def punch(self,*args,**kwargs):
count=0
def send(count):
data={
'command':'punch',
}
while True:
# print(self.punch_target)
if self.punch_target!= None:
self.clientsocket.sendto(str(data).encode(),self.punch_target)
count = count + 1
# print(sys.stderr,"punch packet {0} sent to {1} ".format(count,str(self.punch_target)))
# threading.Timer(2,send,args=(count+1,)).start()
# else:
# threading.Timer(2,send,args=(count,)).start()
time.sleep(2)
t=threading.Timer(2,send,args=(count,))
t.setDaemon(True)
t.start()
@staticmethod
def get_nat_type():
__version__ = "0.0.4"
log = logging.getLogger("pystun")
def enable_logging():
logging.basicConfig()
log.setLevel(logging.DEBUG)
stun_servers_list = (
"stun.ekiga.net",
'stunserver.org',
'stun.ideasip.com',
'stun.softjoys.com',
'stun.voipbuster.com',
)
#stun attributes
MappedAddress = '0001'
ResponseAddress = '0002'
ChangeRequest = '0003'
SourceAddress = '0004'
ChangedAddress = '0005'
Username = '0006'
Password = '0007'
MessageIntegrity = '0008'
ErrorCode = '0009'
UnknownAttribute = '000A'
ReflectedFrom = '000B'
XorOnly = '0021'
XorMappedAddress = '8020'
ServerName = '8022'
SecondaryAddress = '8050' # Non standard extention
#types for a stun message
BindRequestMsg = '0001'
BindResponseMsg = '0101'
BindErrorResponseMsg = '0111'
SharedSecretRequestMsg = '0002'
SharedSecretResponseMsg = '0102'
SharedSecretErrorResponseMsg = '0112'
dictAttrToVal = {'MappedAddress': MappedAddress,
'ResponseAddress': ResponseAddress,
'ChangeRequest': ChangeRequest,
'SourceAddress': SourceAddress,
'ChangedAddress': ChangedAddress,
'Username': Username,
'Password': Password,
'MessageIntegrity': MessageIntegrity,
'ErrorCode': ErrorCode,
'UnknownAttribute': UnknownAttribute,
'ReflectedFrom': ReflectedFrom,
'XorOnly': XorOnly,
'XorMappedAddress': XorMappedAddress,
'ServerName': ServerName,
'SecondaryAddress': SecondaryAddress}
dictMsgTypeToVal = {
'BindRequestMsg': BindRequestMsg,
'BindResponseMsg': BindResponseMsg,
'BindErrorResponseMsg': BindErrorResponseMsg,
'SharedSecretRequestMsg': SharedSecretRequestMsg,
'SharedSecretResponseMsg': SharedSecretResponseMsg,
'SharedSecretErrorResponseMsg': SharedSecretErrorResponseMsg}
dictValToMsgType = {}
dictValToAttr = {}
Blocked = "Blocked"
OpenInternet = "Open Internet"
FullCone = "Full Cone"
SymmetricUDPFirewall = "Symmetric UDP Firewall"
RestrictNAT = "Restrict NAT"
RestrictPortNAT = "Restrict Port NAT"
SymmetricNAT = "Symmetric NAT"
ChangedAddressError = "Meet an error, when do Test1 on Changed IP and Port"
def _initialize():
items = list(dictAttrToVal.items())
for i in range(len(items)):
dictValToAttr.update({items[i][1]: items[i][0]})
items = list(dictMsgTypeToVal.items())
for i in range(len(items)):
dictValToMsgType.update({items[i][1]: items[i][0]})
def gen_tran_id():
a = ''
for i in range(32):
a += random.choice('0123456789ABCDEF') # RFC3489 128bits transaction ID
#return binascii.a2b_hex(a)
return a
def stun_test(sock, host, port, source_ip, source_port, send_data=""):
retVal = {'Resp': False, 'ExternalIP': None, 'ExternalPort': None,
'SourceIP': None, 'SourcePort': None, 'ChangedIP': None,
'ChangedPort': None}
str_len = "%#04d" % (len(send_data) / 2)
tranid = gen_tran_id()
str_data = ''.join([BindRequestMsg, str_len, tranid, send_data])
data = binascii.a2b_hex(str_data)
recvCorr = False
while not recvCorr:
recieved = False
count = 3
while not recieved:
log.debug("sendto %s" % str((host, port)))
try:
# print(host,port)
sock.sendto(data, (host, port))
except socket.gaierror:
retVal['Resp'] = False
return retVal
try:
buf, addr = sock.recvfrom(2048)
log.debug("recvfrom: %s" % str(addr))
recieved = True
except Exception:
recieved = False
if count > 0:
count -= 1
else:
retVal['Resp'] = False
return retVal
msgtype = binascii.b2a_hex(buf[0:2])
bind_resp_msg = dictValToMsgType[msgtype.decode()] == "BindResponseMsg"
# print(bind_resp_msg)
tranid_match = tranid.upper().encode() == binascii.b2a_hex(buf[4:20]).upper()
# print(binascii.b2a_hex(buf[4:20]).upper())
# print(tranid.upper())
# print(tranid_match)
if bind_resp_msg and tranid_match:
recvCorr = True
retVal['Resp'] = True
len_message = int(binascii.b2a_hex(buf[2:4]), 16)
len_remain = len_message
base = 20
while len_remain:
attr_type = binascii.b2a_hex(buf[base:(base + 2)])
attr_len = int(binascii.b2a_hex(buf[(base + 2):(base + 4)]),
16)
if attr_type == MappedAddress.encode(): # first two bytes: 0x0001
port = int(binascii.b2a_hex(buf[base + 6:base + 8]), 16)
ip = ".".join([
str(int(binascii.b2a_hex(buf[base + 8:base + 9]), 16)),
str(int(binascii.b2a_hex(buf[base + 9:base + 10]), 16)),
str(int(binascii.b2a_hex(buf[base + 10:base + 11]), 16)),
str(int(binascii.b2a_hex(buf[base + 11:base + 12]), 16))])
retVal['ExternalIP'] = ip
retVal['ExternalPort'] = port
if attr_type == SourceAddress.encode():
port = int(binascii.b2a_hex(buf[base + 6:base + 8]), 16)
ip = ".".join([
str(int(binascii.b2a_hex(buf[base + 8:base + 9]), 16)),
str(int(binascii.b2a_hex(buf[base + 9:base + 10]), 16)),
str(int(binascii.b2a_hex(buf[base + 10:base + 11]), 16)),
str(int(binascii.b2a_hex(buf[base + 11:base + 12]), 16))])
retVal['SourceIP'] = ip
retVal['SourcePort'] = port
if attr_type == ChangedAddress.encode():
port = int(binascii.b2a_hex(buf[base + 6:base + 8]), 16)
ip = ".".join([
str(int(binascii.b2a_hex(buf[base + 8:base + 9]), 16)),
str(int(binascii.b2a_hex(buf[base + 9:base + 10]), 16)),
str(int(binascii.b2a_hex(buf[base + 10:base + 11]), 16)),
str(int(binascii.b2a_hex(buf[base + 11:base + 12]), 16))])
retVal['ChangedIP'] = ip
# print(ip)
retVal['ChangedPort'] = port
#if attr_type == ServerName:
#serverName = buf[(base+4):(base+4+attr_len)]
base = base + 4 + attr_len
len_remain = len_remain - (4 + attr_len)
#s.close()
return retVal
def get_nat_type(s, source_ip, source_port, stun_host=None, stun_port=3478):
_initialize()
port = stun_port
log.debug("Do Test1")
resp = False
if stun_host:
ret = stun_test(s, stun_host, port, source_ip, source_port)
resp = ret['Resp']
else:
for stun_host in stun_servers_list:
log.debug('Trying STUN host: %s' % stun_host)
ret = stun_test(s, stun_host, port, source_ip, source_port)
resp = ret['Resp']
if resp:
break
if not resp:
return Blocked, ret
log.debug("Result: %s" % ret)
exIP = ret['ExternalIP']
exPort = ret['ExternalPort']
changedIP = ret['ChangedIP']
changedPort = ret['ChangedPort']
if ret['ExternalIP'] == source_ip:
changeRequest = ''.join([ChangeRequest, '0004', "00000006"])
ret = stun_test(s, stun_host, port, source_ip, source_port,
changeRequest)
if ret['Resp']:
typ = OpenInternet
else:
print("firewall")
typ = SymmetricUDPFirewall
else:
changeRequest = ''.join([ChangeRequest, '0004', "00000006"])
log.debug("Do Test2")
ret = stun_test(s, stun_host, port, source_ip, source_port,
changeRequest)
log.debug("Result: %s" % ret)
if ret['Resp']:
typ = FullCone
else:
log.debug("Do Test1")
# print(changedIP)
ret = stun_test(s, changedIP, changedPort, source_ip, source_port)
log.debug("Result: %s" % ret)
if not ret['Resp']:
typ = ChangedAddressError
else:
if exIP == ret['ExternalIP'] and exPort == ret['ExternalPort']:
changePortRequest = ''.join([ChangeRequest, '0004', "00000002"])
log.debug("Do Test3")
ret = stun_test(s, changedIP, port, source_ip, source_port, changePortRequest)
log.debug("Result: %s" % ret)
if ret['Resp'] == True:
typ = RestrictNAT
else:
typ = RestrictPortNAT
else:
typ = SymmetricNAT
return typ, ret
def get_ip_info(source_ip="0.0.0.0", source_port=54320, stun_host=None,
stun_port=3478):
socket.setdefaulttimeout(2)
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind((source_ip, source_port))
nat_type, nat = get_nat_type(s, source_ip, source_port,
stun_host=stun_host, stun_port=stun_port)
external_ip = nat['ExternalIP']
external_port = nat['ExternalPort']
s.close()
socket.setdefaulttimeout(None)
return nat_type, external_ip, external_port
def main():
nat_type, external_ip, external_port = get_ip_info()
# print("NAT Type:", nat_type)
# print("External IP:", external_ip)
# print("External Port:", external_port)
return nat_type
return main()
if __name__ == "__main__":
# HOST,PORT="localhost",9999
if opts.host == "localhost":
opts.host ='127.0.0.1'
client=udpclient(opts.host,opts.port,opts.rid,opts.nat_type)
# client=udpclient("localhost",9999,"100")
try:
client.start()
# client.get_nat_type()
except Exception as e:
print(e)