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#!/router/bin/python
from trex_stl_exceptions import *
from trex_stl_packet_builder_interface import CTrexPktBuilderInterface
from trex_stl_packet_builder_scapy import CScapyTRexPktBuilder, Ether, IP, RawPcapReader
from collections import OrderedDict, namedtuple
from dpkt import pcap
import random
import yaml
import base64
import string
import traceback
def random_name (l):
return ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(l))
# base class for TX mode
class STLTXMode(object):
def __init__ (self):
self.fields = {}
def to_json (self):
return self.fields
# continuous mode
class STLTXCont(STLTXMode):
def __init__ (self, pps = 1):
if not isinstance(pps, (int, float)):
raise STLArgumentError('pps', pps)
super(STLTXCont, self).__init__()
self.fields['type'] = 'continuous'
self.fields['pps'] = pps
# single burst mode
class STLTXSingleBurst(STLTXMode):
def __init__ (self, pps = 1, total_pkts = 1):
if not isinstance(pps, (int, float)):
raise STLArgumentError('pps', pps)
if not isinstance(total_pkts, int):
raise STLArgumentError('total_pkts', total_pkts)
super(STLTXSingleBurst, self).__init__()
self.fields['type'] = 'single_burst'
self.fields['pps'] = pps
self.fields['total_pkts'] = total_pkts
# multi burst mode
class STLTXMultiBurst(STLTXMode):
def __init__ (self,
pps = 1,
pkts_per_burst = 1,
ibg = 0.0,
count = 1):
if not isinstance(pps, (int, float)):
raise STLArgumentError('pps', pps)
if not isinstance(pkts_per_burst, int):
raise STLArgumentError('pkts_per_burst', pkts_per_burst)
if not isinstance(ibg, (int, float)):
raise STLArgumentError('ibg', ibg)
if not isinstance(count, int):
raise STLArgumentError('count', count)
super(STLTXMultiBurst, self).__init__()
self.fields['type'] = 'multi_burst'
self.fields['pps'] = pps
self.fields['pkts_per_burst'] = pkts_per_burst
self.fields['ibg'] = ibg
self.fields['number_of_bursts'] = count
class STLStream(object):
def __init__ (self,
name = random_name(8),
packet = None,
mode = STLTXCont(1),
enabled = True,
self_start = True,
isg = 0.0,
rx_stats = None,
next = None,
stream_id = None):
# type checking
if not isinstance(mode, STLTXMode):
raise STLArgumentError('mode', mode)
if packet and not isinstance(packet, CTrexPktBuilderInterface):
raise STLArgumentError('packet', packet)
if not isinstance(enabled, bool):
raise STLArgumentError('enabled', enabled)
if not isinstance(self_start, bool):
raise STLArgumentError('self_start', self_start)
if not isinstance(isg, (int, float)):
raise STLArgumentError('isg', isg)
if (type(mode) == STLTXCont) and (next != None):
raise STLError("continuous stream cannot have a next stream ID")
# tag for the stream and next - can be anything
self.name = name
self.next = next
self.set_id(stream_id)
self.fields = {}
# basic fields
self.fields['enabled'] = enabled
self.fields['self_start'] = self_start
self.fields['isg'] = isg
# mode
self.fields['mode'] = mode.to_json()
self.fields['packet'] = {}
self.fields['vm'] = {}
if not packet:
packet = CScapyTRexPktBuilder(pkt = Ether()/IP())
# packet builder
packet.compile()
# packet and VM
self.fields['packet'] = packet.dump_pkt()
self.fields['vm'] = packet.get_vm_data()
if not rx_stats:
self.fields['rx_stats'] = {}
self.fields['rx_stats']['enabled'] = False
else:
self.fields['rx_stats'] = rx_stats
def __str__ (self):
s = "Stream Name: {0}\n".format(self.name)
s += "Stream Next: {0}\n".format(self.next)
s += "Stream JSON:\n{0}\n".format(json.dumps(self.fields, indent = 4, separators=(',', ': '), sort_keys = True))
return s
def to_json (self):
return self.fields
def get_id (self):
return self.id
def set_id (self, id):
self.id = id
def get_name (self):
return self.name
def get_next (self):
return self.next
def to_yaml (self):
return {'name': self.name, 'stream': self.fields}
class YAMLLoader(object):
def __init__ (self, yaml_file):
self.yaml_path = os.path.dirname(yaml_file)
self.yaml_file = yaml_file
def __parse_packet (self, packet_dict):
packet_type = set(packet_dict).intersection(['binary', 'pcap'])
if len(packet_type) != 1:
raise STLError("packet section must contain either 'binary' or 'pcap'")
if 'binary' in packet_type:
try:
pkt_str = base64.b64decode(packet_dict['binary'])
except TypeError:
raise STLError("'binary' field is not a valid packet format")
builder = CScapyTRexPktBuilder(pkt_buffer = pkt_str)
elif 'pcap' in packet_type:
pcap = os.path.join(self.yaml_path, packet_dict['pcap'])
if not os.path.exists(pcap):
raise STLError("'pcap' - cannot find '{0}'".format(pcap))
builder = CScapyTRexPktBuilder(pkt = pcap)
return builder
def __parse_mode (self, mode_obj):
mode_type = mode_obj.get('type')
if mode_type == 'continuous':
defaults = STLTXCont()
mode = STLTXCont(pps = mode_obj.get('pps', defaults.fields['pps']))
elif mode_type == 'single_burst':
defaults = STLTXSingleBurst()
mode = STLTXSingleBurst(pps = mode_obj.get('pps', defaults.fields['pps']),
total_pkts = mode_obj.get('total_pkts', defaults.fields['total_pkts']))
elif mode_type == 'multi_burst':
defaults = STLTXMultiBurst()
mode = STLTXMultiBurst(pps = mode_obj.get('pps', defaults.fields['pps']),
pkts_per_burst = mode_obj.get('pkts_per_burst', defaults.fields['pkts_per_burst']),
ibg = mode_obj.get('ibg', defaults.fields['ibg']),
count = mode_obj.get('count', defaults.fields['count']))
else:
raise STLError("mode type can be 'continuous', 'single_burst' or 'multi_burst")
return mode
def __parse_stream (self, yaml_object):
s_obj = yaml_object['stream']
# parse packet
packet = s_obj.get('packet')
if not packet:
raise STLError("YAML file must contain 'packet' field")
builder = self.__parse_packet(packet)
# mode
mode_obj = s_obj.get('mode')
if not mode_obj:
raise STLError("YAML file must contain 'mode' field")
mode = self.__parse_mode(mode_obj)
defaults = STLStream()
# create the stream
stream = STLStream(name = yaml_object.get('name'),
packet = builder,
mode = mode,
enabled = s_obj.get('enabled', defaults.fields['enabled']),
self_start = s_obj.get('self_start', defaults.fields['self_start']),
isg = s_obj.get('isg', defaults.fields['isg']),
rx_stats = s_obj.get('rx_stats', defaults.fields['rx_stats']),
next = yaml_object.get('next'))
# hack the VM fields for now
if 'vm' in s_obj:
stream.fields['vm'].update(s_obj['vm'])
return stream
def parse (self):
with open(self.yaml_file, 'r') as f:
# read YAML and pass it down to stream object
yaml_str = f.read()
try:
objects = yaml.load(yaml_str)
except yaml.parser.ParserError as e:
raise STLError(str(e))
streams = [self.__parse_stream(object) for object in objects]
return streams
# profile class
class STLProfile(object):
def __init__ (self, streams = None):
if streams == None:
streams = []
if not type(streams) == list:
streams = [streams]
if not all([isinstance(stream, STLStream) for stream in streams]):
raise STLArgumentError('streams', streams)
self.streams = streams
def get_streams (self):
return self.streams
def __str__ (self):
return '\n'.join([str(stream) for stream in self.streams])
@staticmethod
def load_yaml (yaml_file):
# check filename
if not os.path.isfile(yaml_file):
raise STLError("file '{0}' does not exists".format(yaml_file))
yaml_loader = YAMLLoader(yaml_file)
streams = yaml_loader.parse()
return STLProfile(streams)
@staticmethod
def load_py (python_file):
# check filename
if not os.path.isfile(python_file):
raise STLError("file '{0}' does not exists".format(python_file))
basedir = os.path.dirname(python_file)
sys.path.append(basedir)
try:
file = os.path.basename(python_file).split('.')[0]
module = __import__(file, globals(), locals(), [], -1)
reload(module) # reload the update
streams = module.register().get_streams()
return STLProfile(streams)
except Exception as e:
a, b, tb = sys.exc_info()
x =''.join(traceback.format_list(traceback.extract_tb(tb)[1:])) + a.__name__ + ": " + str(b) + "\n"
summary = "\nPython Traceback follows:\n\n" + x
raise STLError(summary)
finally:
sys.path.remove(basedir)
@staticmethod
def load_pcap (pcap_file):
# check filename
if not os.path.isfile(pcap_file):
raise STLError("file '{0}' does not exists".format(pcap_file))
streams = []
last_ts_usec = 0
pkts = RawPcapReader(pcap_file).read_all()
for i, (cap, meta) in enumerate(pkts, start = 1):
ts_usec = meta[0] * 1e6 + meta[1]
streams.append(STLStream(name = i,
packet = CScapyTRexPktBuilder(pkt_buffer = cap),
mode = STLTXSingleBurst(total_pkts = 1),
self_start = True if (i == 1) else False,
isg = (ts_usec - last_ts_usec), # seconds to usec
next = (i + 1) if i != len(pkts) else None))
last_ts_usec = ts_usec
return STLProfile(streams)
@staticmethod
def load (filename):
x = os.path.basename(filename).split('.')
suffix = x[1] if (len(x) == 2) else None
if suffix == 'py':
profile = STLProfile.load_py(filename)
elif suffix == 'yaml':
profile = STLProfile.load_yaml(filename)
elif suffix in ['cap', 'pcap']:
profile = STLProfile.load_pcap(filename)
else:
raise STLError("unknown profile file type: '{0}'".format(suffix))
return profile
def dump_to_yaml (self, yaml_file = None):
yaml_list = [stream.to_yaml() for stream in self.streams]
yaml_str = yaml.dump(yaml_list, default_flow_style = False)
# write to file if provided
if yaml_file:
with open(yaml_file, 'w') as f:
f.write(yaml_str)
return yaml_str
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