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|
#import packet_builder
import random
import string
import struct
import socket
import json
import yaml
import binascii
from scapy.all import *
class CTRexPacketBuildException(Exception):
"""
This is the general Packet Building error exception class.
"""
def __init__(self, code, message):
self.code = code
self.message = message
def __str__(self):
return self.__repr__()
def __repr__(self):
return u"[errcode:%r] %r" % (self.code, self.message)
################################################################################################
def ipv4_str_to_num (ipv4_buffer):
assert(type(ipv4_buffer)==str);
assert(len(ipv4_buffer)==4);
res=0;
shift=24
for i in ipv4_buffer:
res = res + (ord(i)<<shift);
shift =shift -8
return res
def is_valid_ipv4(ip_addr):
"""
return buffer in network order
"""
if type(ip_addr)==str and len(ip_addr) == 4:
return ip_addr
if type(ip_addr)==int :
ip_addr = socket.inet_ntoa(struct.pack("!I", ip_addr))
try:
return socket.inet_pton(socket.AF_INET, ip_addr)
except AttributeError: # no inet_pton here, sorry
return socket.inet_aton(ip_addr)
except socket.error: # not a valid address
raise CTRexPacketBuildException(-10,"not valid ipv4 format");
class CTRexScriptsBase(object):
"""
VM Script base class
"""
def clone (self):
return copy.deepcopy(self)
class CTRexScFieldRangeBase(CTRexScriptsBase):
FILED_TYPES = ["inc","dec","rand"]
def __init__(self, field_name,
field_type
):
super(CTRexScFieldRangeBase, self).__init__()
self.field_name =field_name
self.field_type =field_type
if not self.field_type in CTRexScFieldRangeBase.FILED_TYPES :
raise CTRexPacketBuildException(-12,"field type should be in [inc,dec,rand] ");
class CTRexScFieldRangeValue(CTRexScFieldRangeBase):
"""
range of field value
"""
def __init__(self, field_name,
field_type,
min_val,
max_val
):
super(CTRexScFieldRangeValue, self).__init__(field_name,field_type)
self.min_val =min_val;
self.max_val =max_val;
if min_val > max_val:
raise CTRexPacketBuildException(-12,"min is greater than max ");
if min_val == max_val:
raise CTRexPacketBuildException(-13,"min value is equal to max value, you can't use this type of range ");
class CTRexScIpv4SimpleRange(CTRexScFieldRangeBase):
"""
range of ipv4 ip
"""
def __init__(self, field_name,field_type,min_ip, max_ip):
super(CTRexScIpv4SimpleRange, self).__init__(field_name,field_type)
self.min_ip = min_ip
self.max_ip = max_ip
mmin=ipv4_str_to_num (is_valid_ipv4(min_ip))
mmax=ipv4_str_to_num (is_valid_ipv4(max_ip))
if mmin > mmax :
raise CTRexPacketBuildException(-11,"CTRexScIpv4SimpleRange m_min ip is bigger than max ");
class CTRexScIpv4TupleGen(CTRexScriptsBase):
"""
range tuple
"""
FLAGS_ULIMIT_FLOWS =1
def __init__(self, min_ipv4, max_ipv4,num_flows=100000,min_port=1025,max_port=65535,flags=0):
super(CTRexScIpv4TupleGen, self).__init__()
self.min_ip = min_ipv4
self.max_ip = max_ipv4
mmin=ipv4_str_to_num (is_valid_ipv4(min_ipv4))
mmax=ipv4_str_to_num (is_valid_ipv4(max_ipv4))
if mmin > mmax :
raise CTRexPacketBuildException(-11,"CTRexScIpv4SimpleRange m_min ip is bigger than max ");
self.num_flows=num_flows;
self.min_port =min_port
self.max_port =max_port
self.flags = flags
class CTRexScTrimPacketSize(CTRexScriptsBase):
"""
trim packet size. field type is CTRexScFieldRangeBase.FILED_TYPES = ["inc","dec","rand"]
"""
def __init__(self,field_type="rand",min_pkt_size=None, max_pkt_size=None):
super(CTRexScTrimPacketSize, self).__init__()
self.field_type = field_type
self.min_pkt_size = min_pkt_size
self.max_pkt_size = max_pkt_size
if max_pkt_size != None and min_pkt_size !=None :
if min_pkt_size == max_pkt_size:
raise CTRexPacketBuildException(-11,"CTRexScTrimPacketSize min_pkt_size is the same as max_pkt_size ");
if min_pkt_size > max_pkt_size:
raise CTRexPacketBuildException(-11,"CTRexScTrimPacketSize min_pkt_size is bigger than max_pkt_size ");
class CTRexScRaw(CTRexScriptsBase):
"""
raw instructions
"""
def __init__(self,list_of_commands=None):
super(CTRexScRaw, self).__init__()
if list_of_commands==None:
self.commands =[]
else:
self.commands = list_of_commands
def add_cmd (self,cmd):
self.commands.append(cmd)
################################################################################################
# VM raw instructions
################################################################################################
class CTRexVmInsBase(object):
"""
instruction base
"""
def __init__(self,ins_type):
self.type = ins_type
assert(type(ins_type)==str);
class CTRexVmInsFixIpv4(CTRexVmInsBase):
def __init__(self,offset):
super(CTRexVmInsFixIpv4, self).__init__("fix_checksum_ipv4")
self.offset = offset
assert(type(offset)==int);
class CTRexVmInsFlowVar(CTRexVmInsBase):
#TBD add more validation tests
OPERATIONS =["inc", "dec", "random"]
VALID_SIZES =[1,2,4,8]
def __init__(self,fv_name,size,op,init_val,min_val,max_val):
super(CTRexVmInsFlowVar, self).__init__("flow_var")
self.name =fv_name;
assert(type(fv_name)==str);
self.size =size
self.op =op
self.init_val=init_val
assert(type(init_val)==int);
self.min_val=min_val
assert(type(min_val)==int);
self.max_val=max_val
assert(type(max_val)==int);
class CTRexVmInsWrFlowVar(CTRexVmInsBase):
def __init__(self,fv_name,pkt_offset,add_val=0,is_big=True):
super(CTRexVmInsWrFlowVar, self).__init__("write_flow_var")
self.name =fv_name
assert(type(fv_name)==str);
self.pkt_offset =pkt_offset
assert(type(pkt_offset)==int);
self.add_val =add_val
assert(type(add_val)==int);
self.is_big =is_big;
assert(type(is_big)==bool);
class CTRexVmInsTrimPktSize(CTRexVmInsBase):
def __init__(self,fv_name):
super(CTRexVmInsTrimPktSize, self).__init__("trim_pkt_size")
self.fv_name =fv_name
assert(type(fv_name)==str);
class CTRexVmInsTupleGen(CTRexVmInsBase):
def __init__(self,fv_name,ip_min,ip_max,port_min,port_max,limit_flows,flags=0):
super(CTRexVmInsTupleGen, self).__init__("tuple_flow_var")
self.name =fv_name
assert(type(fv_name)==str);
self.ip_min = ip_min;
self.ip_max = ip_max;
self.port_min = port_min;
self.port_max = port_max;
self.limit_flows = limit_flows;
self.flags =flags;
################################################################################################
#
class CTRexVmEngine(object):
def __init__(self):
"""
inlcude list of instruction
"""
super(CTRexVmEngine, self).__init__()
self.ins=[]
self.split_by_var = ''
# return as json
def get_json (self):
inst_array = [];
# dump it as dict
for obj in self.ins:
inst_array.append(obj.__dict__);
return {'instructions': inst_array, 'split_by_var': self.split_by_var}
def add_ins (self,ins):
#assert issubclass(ins, CTRexVmInsBase)
self.ins.append(ins);
def dump (self):
cnt=0;
for obj in self.ins:
print "ins",cnt
cnt = cnt +1
print obj.__dict__
def dump_bjson (self):
print json.dumps(self.get_json(), sort_keys=True, indent=4)
def dump_as_yaml (self):
print yaml.dump(self.get_json(), default_flow_style=False)
################################################################################################
class CTRexScapyPktUtl(object):
def __init__(self,scapy_pkt):
self.pkt = scapy_pkt
def pkt_iter (self):
p=self.pkt;
while True:
yield p
p=p.payload
if p ==None or isinstance(p,NoPayload):
break;
def get_list_iter (self):
l=list(self.pkt_iter())
return l
def get_pkt_layers (self):
"""
return string 'IP:UDP:TCP'
"""
l=self.get_list_iter ();
l1=map(lambda p: p.name,l );
return ":".join(l1);
def _layer_offset(self,name,cnt=0):
"""
return offset of layer e.g 'IP',1 will return offfset of layer ip:1
"""
save_cnt=cnt
for pkt in self.pkt_iter ():
if pkt.name == name:
if cnt==0:
return (pkt, pkt.offset)
else:
cnt=cnt -1
raise CTRexPacketBuildException(-11,("no layer %s-%d" % (name,save_cnt)));
def layer_offset(self,name,cnt=0):
"""
return offset of layer e.g 'IP',1 will return offfset of layer ip:1
"""
save_cnt=cnt
for pkt in self.pkt_iter ():
if pkt.name == name:
if cnt==0:
return pkt.offset
else:
cnt=cnt -1
raise CTRexPacketBuildException(-11,("no layer %s-%d" % (name,save_cnt)));
def get_field_offet(self,layer,layer_cnt,field_name):
"""
return offset of layer e.g 'IP',1 will return offfset of layer ip:1
"""
t=self._layer_offset(layer,layer_cnt);
l_offset=t[1];
layer_pkt=t[0]
#layer_pkt.dump_fields_offsets ()
for f in layer_pkt.fields_desc:
if f.name == field_name:
return (l_offset+f.offset,f.get_size_bytes ());
raise CTRexPacketBuildException(-11,("no layer %s-%d." % (name,save_cnt,field_name)));
def get_layer_offet_by_str(self,layer_des):
"""
return layer offset by string
IP:0
IP:1
return offset
"""
l1=layer_des.split(":")
layer=""
layer_cnt=0;
if len(l1)==1:
layer=l1[0];
else:
layer=l1[0];
layer_cnt=int(l1[1]);
return self.layer_offset(layer,layer_cnt)
def get_field_offet_by_str(self,field_des):
"""
return field_des (offset,size) layer:cnt.field
for example
IP.src
IP:0.src (first IP.src like IP.src)
for example IP:1.src for internal IP
return (offset, size) as tuple
"""
s=field_des.split(".");
if len(s)!=2:
raise CTRexPacketBuildException(-11,("field desription should be layer:cnt.field e.g IP.src or IP:1.src "));
layer_ex = s[0]
field = s[1]
l1=layer_ex.split(":")
layer=""
layer_cnt=0;
if len(l1)==1:
layer=l1[0];
else:
layer=l1[0];
layer_cnt=int(l1[1]);
return self.get_field_offet(layer,layer_cnt,field)
def has_IPv4 (self):
return self.pkt.has_layer("IP");
def has_IPv6 (self):
return self.pkt.has_layer("IPv6");
def has_UDP (self):
return self.pkt.has_layer("UDP");
################################################################################################
class CTRexVmDescBase(object):
"""
instruction base
"""
def __init__(self):
pass;
def get_obj (self):
return self;
def get_json (self):
return self.get_obj().__dict__
def dump_bjson (self):
print json.dumps(self.get_json(), sort_keys=True, indent=4)
def dump_as_yaml (self):
print yaml.dump(self.get_json(), default_flow_style=False)
def get_var_name(self):
'''
virtual function return the varible name if exists
'''
return None
def compile(self,parent):
'''
virtual function to take parent than has function name_to_offset
'''
pass;
def valid_fv_size (size):
if not (size in CTRexVmInsFlowVar.VALID_SIZES):
raise CTRexPacketBuildException(-11,("flow var has not valid size %d ") % size );
def valid_fv_ops (op):
if not (op in CTRexVmInsFlowVar.OPERATIONS):
raise CTRexPacketBuildException(-11,("flow var does not have a valid op %s ") % op );
def convert_val (val):
if type(val) == int:
return val
else:
if type(val) == str:
return ipv4_str_to_num (is_valid_ipv4(val))
else:
raise CTRexPacketBuildException(-11,("init val not valid %s ") % val );
class CTRexVmDescFlowVar(CTRexVmDescBase):
def __init__(self,name,init_val=0,min_val=0,max_val=255,size=4,op="inc"):
super(CTRexVmDescFlowVar, self).__init__()
self.name = name;
assert(type(name)==str);
self.size =size
valid_fv_size(size)
self.op =op
valid_fv_ops (op)
self.init_val = convert_val (init_val)
self.min_val = convert_val (min_val);
self.max_val = convert_val (max_val)
if self.min_val > self.max_val :
raise CTRexPacketBuildException(-11,("max %d is lower than min %d ") % (self.max_val,self.min_val) );
def get_obj (self):
return CTRexVmInsFlowVar(self.name,self.size,self.op,self.init_val,self.min_val,self.max_val);
def get_var_name(self):
return self.name
class CTRexVmDescFixIpv4(CTRexVmDescBase):
def __init__(self,offset):
super(CTRexVmDescFixIpv4, self).__init__()
self.offset = offset; # could be a name of offset
def get_obj (self):
return CTRexVmInsFixIpv4(self.offset);
def compile(self,parent):
if type(self.offset)==str:
self.offset = parent._pkt_layer_offset(self.offset);
class CTRexVmDescWrFlowVar(CTRexVmDescBase):
def __init__(self,fv_name,pkt_offset,add_val=0,is_big=True):
super(CTRexVmDescWrFlowVar, self).__init__()
self.name =fv_name
assert(type(fv_name)==str);
self.pkt_offset =pkt_offset
self.add_val =add_val
assert(type(add_val)==int);
self.is_big =is_big;
assert(type(is_big)==bool);
def get_obj (self):
return CTRexVmInsWrFlowVar(self.name,self.pkt_offset,self.add_val,self.is_big)
def compile(self,parent):
if type(self.pkt_offset)==str:
t=parent._name_to_offset(self.pkt_offset)
self.pkt_offset = t[0]
################################################################################################
class CScapyTRexPktBuilder(object):
"""
This class defines the TRex API of building a packet using dpkt package.
Using this class the user can also define how TRex will handle the packet by specifying the VM setting.
"""
def __init__(self):
"""
Instantiate a CTRexPktBuilder object
:parameters:
None
"""
super(CScapyTRexPktBuilder, self).__init__()
self._pkt = None # scapy packet
self.vm_scripts = [] # list of high level instructions
self.vm_low_level = None
self.metadata=""
def get_vm_data(self):
"""
Dumps the instructions
:parameters:
None
:return:
+ json object of instructions
"""
return self.vm_low_level.get_json ()
def dump_pkt(self):
"""
Dumps the packet as a decimal array of bytes (each item x gets value between 0-255)
:parameters:
None
:return:
+ packet representation as array of bytes
:raises:
+ :exc:`CTRexPktBuilder.EmptyPacketError`, in case packet is empty.
"""
assert(self.pkt);
pkt_in_hex = binascii.hexlify(str(self.pkt))
return {"binary": [int(pkt_in_hex[i:i+2], 16)
for i in range(0, len(pkt_in_hex), 2)],
"meta": self.metadata}
def add_command (self,script):
self.vm_scripts.append(script.clone());
def dump_scripts (self):
self.vm_low_level.dump_as_yaml ()
def set_packet (self,pkt):
"""
Scapy packet Ether()/IP(src="16.0.0.1",dst="48.0.0.1")/UDP(dport=12,sport=1025)/IP()/"A"*10
"""
self.pkt =pkt;
def compile (self):
self.vm_low_level=CTRexVmEngine()
assert(self.pkt);
self.pkt.build();
for sc in self.vm_scripts:
if isinstance(sc, CTRexScRaw):
self._compile_raw (sc)
#for obj in self.vm_scripts:
# # tuple gen script
# if isinstance(obj, CTRexScIpv4TupleGen)
# self._add_tuple_gen(tuple_gen)
####################################################
# private
def _compile_raw (self,obj):
# make sure we have varibles once
vars={};
for desc in obj.commands:
print desc.__dict__
var_name = desc.get_var_name()
print var_name
if var_name :
if vars.has_key(var_name):
raise CTRexPacketBuildException(-11,("varible %s define twice ") % (var_name) );
else:
vars[var_name]=1
desc.compile(self);
for desc in obj.commands:
self.vm_low_level.add_ins(desc.get_obj());
def _pkt_layer_offset (self,layer_name):
assert(self.pkt != None);
p_utl=CTRexScapyPktUtl(self.pkt);
return p_utl.get_layer_offet_by_str(layer_name)
def _name_to_offset(self,field_name):
assert(self.pkt != None);
p_utl=CTRexScapyPktUtl(self.pkt);
return p_utl.get_field_offet_by_str(field_name)
def _add_tuple_gen(self,tuple_gen):
pass;
################################################################################################
# tests
################################################################################################
# what should I do
# 1. iterator on the headers
# 2. do I have one IP?
# 3. offset of the UDP/TCP?
# offset of each field inside the packet ?
def test_vm1 ():
a=CTRexVmDescFlowVar(name="a",min_val=0,max_val=255,init_val=0,size=4,op="inc");
a.dump_as_yaml ()
a.dump_bjson()
a=CTRexVmDescFlowVar(name="a",min_val="10.0.0.1",max_val="10.0.0.10",init_val="10.0.0.1",size=4,op="inc");
a.dump_as_yaml ()
a.dump_bjson()
raw = CTRexScRaw()
raw.add_cmd( CTRexVmDescFlowVar(name="a",min_val=0,max_val=255,init_val=0,size=4,op="inc") )
raw.add_cmd( CTRexVmDescFixIpv4(offset = "IP") )
raw.add_cmd( CTRexVmDescWrFlowVar (fv_name="a",pkt_offset= "IP.src") )
raw1 = CTRexScRaw( [ CTRexVmDescFlowVar(name="a",min_val="16.0.0.1",max_val="16.0.0.10",init_val="16.0.0.1",size=4,op="inc"),
CTRexVmDescWrFlowVar (fv_name="a",pkt_offset= "IP.src"),
CTRexVmDescFixIpv4(offset = "IP")]
);
pkt_builder = CScapyTRexPktBuilder();
py='5'*128
pkt=Ether()/ \
IP(src="16.0.0.1",dst="48.0.0.1")/ \
UDP(dport=12,sport=1025)/IP()/py
# set packet
pkt_builder.set_packet(pkt);
pkt_builder.add_command ( raw1 )
pkt_builder.compile();
pkt_builder.dump_scripts ()
print pkt_builder.dump_pkt()
print pkt_builder.get_vm_data()
print "hey"
def test_udp ():
py='5'*128
p1=Ether()/ \
IP(src="16.0.0.1",dst="48.0.0.1")/ \
UDP(dport=12,sport=1025)/IP()/py
p1.build();
#print p1.haslayer("UDP.tos:1");
#pkt_utl=CTRexScapyPktUtl(p1);
#pkt_utl.has_layer("IP");
p_utl=CTRexScapyPktUtl(p1);
for p in p_utl.pkt_iter():
print p.name,":"
print p_utl.get_pkt_layers();
print p_utl.layer_offset("IP")
#print p_utl.layer_offset("IP",2)
t=p_utl.get_field_offet("IP",0,"src")
print t
t=p_utl.get_field_offet("IP",0,"dst")
print t
t=p_utl.get_field_offet_by_str("IP:0.src")
print t
t=p_utl.get_field_offet_by_str("IP.src")
print t
#p1.dump_layers_offset()
#p1.show2();
#hexdump(p1);
#wrpcap("ipv4.pcap", p1);
def test5 ():
# build packet
pass;
def test4 ():
print "test4"
a = CScapyTRexPktBuilder()
a.add_command ( CTRexScIpv4TupleGen("16.0.0.1","16.0.0.5",flags=CTRexScIpv4TupleGen.FLAGS_ULIMIT_FLOWS))
a.dump_scripts ()
a.compile()
def convert_to_hex (buffer):
for i in buffer:
print hex(ord(i))
def test3 ():
vm=CTRexVmEngine()
vm.add_ins(CTRexVmInsFixIpv4(12))
vm.add_ins(CTRexVmInsFixIpv4(15))
#vm.dump();
vm.dump_bjson ()
vm.dump_as_yaml ()
def test2 ():
vm_ins= CTRexVmInsTupleGen("a",0x12000001,0x12000007,1025,1027,limit_flows=10000)
print vm_ins.__dict__
def test1 ():
a = CTRexScFieldRangeValue("ip.src","inc",12,14)
print a.__dict__
b = CTRexScIpv4SimpleRange("ip.src","inc","16.0.0.1","16.0.0.254")
print b.__dict__
c= CTRexScIpv4TupleGen("16.0.0.1","16.0.0.5");
print c.__dict__
d= CTRexScIpv4TupleGen("16.0.0.1","16.0.0.5",flags=CTRexScIpv4TupleGen.FLAGS_ULIMIT_FLOWS);
print d.__dict__
e= CTRexScTrimPacketSize();
print e.__dict__
e1= CTRexScTrimPacketSize(min_pkt_size=120, max_pkt_size=130);
print e1.__dict__
def main ():
test_vm1 ();
return
test_udp ()
return
test4 ();
return
test3 ();
return
test2 ();
return
test1 ();
return
#a=CTRexScIpv4SimpleRange("16.0.0.1","16.0.0.16");
#s=is_valid_ipv4("16.0.0.1");
#s=is_valid_ipv4("\x16\x01\x01\x01");
#s=is_valid_ipv4(0x16000101);
print ipv4_str_to_num("\x10\x01\x01\x01")
return
print ipv4_str_to_num (s)
print s
print type(s);
len(s);
for i in s:
print hex(ord(i))
main();
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