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|
import random
import string
import struct
import socket
import json
import yaml
import binascii
import base64
from trex_stl_packet_builder_interface import CTrexPktBuilderInterface
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, 'type of ipv4_buffer is not str'
assert len(ipv4_buffer)==4, 'size of ipv4_buffer is not 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 %s' % FILED_TYPES);
class CTRexScFieldRangeValue(CTRexScFieldRangeBase):
"""
range of field value
"""
def __init__(self, field_name,
field_type,
min_value,
max_value
):
super(CTRexScFieldRangeValue, self).__init__(field_name,field_type)
self.min_value =min_value;
self.max_value =max_value;
if min_value > max_value:
raise CTRexPacketBuildException(-12, 'min is greater than max');
if min_value == max_value:
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, 'type of ins_type is not str'
class CTRexVmInsFixIpv4(CTRexVmInsBase):
def __init__(self, offset):
super(CTRexVmInsFixIpv4, self).__init__("fix_checksum_ipv4")
self.pkt_offset = offset
assert type(offset)==int, 'type of offset is not 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_value, min_value, max_value):
super(CTRexVmInsFlowVar, self).__init__("flow_var")
self.name = fv_name;
assert type(fv_name)==str, 'type of fv_name is not str'
self.size = size
self.op = op
self.init_value = init_value
assert type(init_value)==int, 'type of init_value is not int'
self.min_value=min_value
assert type(min_value)==int, 'type of min_value is not int'
self.max_value=max_value
assert type(max_value)==int, 'type of min_value is not int'
class CTRexVmInsWrFlowVar(CTRexVmInsBase):
def __init__(self, fv_name, pkt_offset, add_value=0, is_big_endian=True):
super(CTRexVmInsWrFlowVar, self).__init__("write_flow_var")
self.name = fv_name
assert type(fv_name)==str, 'type of fv_name is not str'
self.pkt_offset = pkt_offset
assert type(pkt_offset)==int, 'type of pkt_offset is not int'
self.add_value = add_value
assert type(add_value)==int, 'type of add_value is not int'
self.is_big_endian = is_big_endian
assert type(is_big_endian)==bool, 'type of is_big_endian is not bool'
class CTRexVmInsTrimPktSize(CTRexVmInsBase):
def __init__(self,fv_name):
super(CTRexVmInsTrimPktSize, self).__init__("trim_pkt_size")
self.name = fv_name
assert type(fv_name)==str, 'type of fv_name is not 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, 'type of fv_name is not 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
:parameters:
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
802|1Q.vlan get 802.1Q->valn replace | with .
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].replace("|",".")
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_ref (self):
'''
virtual function return a ref var name
'''
return None
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 );
def check_for_int (val):
assert type(val)==int, 'type of vcal is not int'
class CTRexVmDescFlowVar(CTRexVmDescBase):
def __init__(self, name, init_value=None, min_value=0, max_value=255, size=4, op="inc"):
super(CTRexVmDescFlowVar, self).__init__()
self.name = name;
assert type(name)==str, 'type of name is not str'
self.size =size
valid_fv_size(size)
self.op =op
valid_fv_ops (op)
# choose default value for init val
if init_value == None:
init_value = max_value if op == "dec" else min_value
self.init_value = convert_val (init_value)
self.min_value = convert_val (min_value);
self.max_value = convert_val (max_value)
if self.min_value > self.max_value :
raise CTRexPacketBuildException(-11,("max %d is lower than min %d ") % (self.max_value,self.min_value) );
def get_obj (self):
return CTRexVmInsFlowVar(self.name,self.size,self.op,self.init_value,self.min_value,self.max_value);
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, offset_fixup=0, add_val=0, is_big=True):
super(CTRexVmDescWrFlowVar, self).__init__()
self.name =fv_name
assert type(fv_name)==str, 'type of fv_name is not str'
self.offset_fixup =offset_fixup
assert type(offset_fixup)==int, 'type of offset_fixup is not int'
self.pkt_offset =pkt_offset
self.add_val =add_val
assert type(add_val)==int,'type of add_val is not int'
self.is_big =is_big;
assert type(is_big)==bool,'type of is_big_endian is not bool'
def get_var_ref (self):
return self.name
def get_obj (self):
return CTRexVmInsWrFlowVar(self.name,self.pkt_offset+self.offset_fixup,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 CTRexVmDescTrimPktSize(CTRexVmDescBase):
def __init__(self,fv_name):
super(CTRexVmDescTrimPktSize, self).__init__()
self.name = fv_name
assert type(fv_name)==str, 'type of fv_name is not str'
def get_var_ref (self):
return self.name
def get_obj (self):
return CTRexVmInsTrimPktSize(self.name)
class CTRexVmDescTupleGen(CTRexVmDescBase):
def __init__(self,name, ip_min="0.0.0.1", ip_max="0.0.0.10", port_min=1025, port_max=65535, limit_flows=100000, flags=0):
super(CTRexVmDescTupleGen, self).__init__()
self.name = name
assert type(name)==str, 'type of fv_name is not str'
self.ip_min = convert_val(ip_min);
self.ip_max = convert_val(ip_max);
self.port_min = port_min;
check_for_int (port_min)
self.port_max = port_max;
check_for_int(port_max)
self.limit_flows = limit_flows;
check_for_int(limit_flows)
self.flags =flags;
check_for_int(flags)
def get_var_name(self):
return [self.name+".ip",self.name+".port"]
def get_obj (self):
return CTRexVmInsTupleGen(self.name, self.ip_min, self.ip_max, self.port_min, self.port_max, self.limit_flows, self.flags);
################################################################################################
class CScapyTRexPktBuilder(CTrexPktBuilderInterface):
"""
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.
pkt could be Scapy pkt or pcap file name
"""
def __init__(self, pkt = None, pkt_buffer = None, vm = None):
"""
Instantiate a CTRexPktBuilder object
:parameters:
None
"""
super(CScapyTRexPktBuilder, self).__init__()
self.pkt = None # as input
self.pkt_raw = None # from raw pcap file
self.vm_scripts = [] # list of high level instructions
self.vm_low_level = None
self.metadata=""
was_set=False
if pkt != None and pkt_buffer != None:
raise CTRexPacketBuildException(-15, "packet builder cannot be provided with both pkt and pkt_buffer")
# process packet
if pkt != None:
self.set_packet(pkt)
was_set=True
if pkt_buffer != None:
self.set_pkt_as_str(pkt_buffer)
# process VM
if vm != None:
if not isinstance(vm, (CTRexScRaw, list)):
raise CTRexPacketBuildException(-14, "bad value for variable vm")
self.add_command(vm if isinstance(vm, CTRexScRaw) else CTRexScRaw(vm))
was_set=True
if was_set:
self.compile ()
def dump_vm_data_as_yaml(self):
print yaml.dump(self.get_vm_data(), default_flow_style=False)
def get_vm_data(self):
"""
Dumps the instructions
:parameters:
None
:return:
+ json object of instructions
:raises:
+ :exc:`AssertionError`, in case VM is not compiled (is None).
"""
assert self.vm_low_level is not None, 'vm_low_level is None, please use compile()'
return self.vm_low_level.get_json()
def dump_pkt(self, encode = True):
"""
Dumps the packet as a decimal array of bytes (each item x gets value between 0-255)
:parameters:
encode : bool
Encode using base64. (disable for debug)
Default: **True**
:return:
+ packet representation as array of bytes
:raises:
+ :exc:`AssertionError`, in case packet is empty.
"""
pkt_buf = self._get_pkt_as_str()
return {'binary': base64.b64encode(pkt_buf) if encode else pkt_buf,
'meta': self.metadata}
def dump_pkt_to_pcap(self, file_path):
wrpcap(file_path, self._get_pkt_as_str())
def add_command (self, script):
self.vm_scripts.append(script.clone());
def dump_scripts (self):
self.vm_low_level.dump_as_yaml()
def dump_as_hex (self):
pkt_buf = self._get_pkt_as_str()
print hexdump(pkt_buf)
def pkt_layers_desc (self):
"""
return layer description like this IP:TCP:Pyload
"""
pkt_buf = self._get_pkt_as_str()
scapy_pkt = Ether(pkt_buf);
pkt_utl = CTRexScapyPktUtl(scapy_pkt);
return pkt_utl.get_pkt_layers()
def set_pkt_as_str (self, pkt_buffer):
assert type(pkt_buffer)==str, "pkt_buffer should be string"
self.pkt_raw = pkt_buffer
def set_pcap_file (self, pcap_file):
"""
load raw pcap file into a buffer. load only the first packet
:parameters:
pcap_file : file_name
:raises:
+ :exc:`AssertionError`, in case packet is empty.
"""
p=RawPcapReader(pcap_file)
was_set = False
for pkt in p:
was_set=True;
self.pkt_raw = str(pkt[0])
break
if not was_set :
raise CTRexPacketBuildException(-14, "no buffer inside the pcap file")
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
"""
if isinstance(pkt, Packet):
self.pkt = pkt;
else:
if isinstance(pkt, str):
self.set_pcap_file(pkt)
else:
raise CTRexPacketBuildException(-14, "bad packet" )
def compile (self):
self.vm_low_level=CTRexVmEngine()
if self.pkt == None and self.pkt_raw == None:
raise CTRexPacketBuildException(-14, "Packet is empty")
if 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={};
# add it add var to dit
for desc in obj.commands:
var_names = desc.get_var_name()
if var_names :
for var_name in var_names:
if vars.has_key(var_name):
raise CTRexPacketBuildException(-11,("variable %s define twice ") % (var_name) );
else:
vars[var_name]=1
# check that all write exits
for desc in obj.commands:
var_name = desc.get_var_ref()
if var_name :
if not vars.has_key(var_name):
raise CTRexPacketBuildException(-11,("variable %s does not exists ") % (var_name) );
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, 'empty packet'
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, 'empty packet'
p_utl=CTRexScapyPktUtl(self.pkt);
return p_utl.get_field_offet_by_str(field_name)
def _get_pkt_as_str(self):
if self.pkt:
return str(self.pkt)
if self.pkt_raw:
return self.pkt_raw
raise CTRexPacketBuildException(-11, 'empty packet');
def _add_tuple_gen(self,tuple_gen):
pass;
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