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# Copyright (c) 2022 Intel and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from ProtocolHeader import *
from ForgeResult import *
from Node import *
from Edge import *
import os
class ParseGraph:
def __init__(self):
self.nodeDict = {}
self.edgeDict = {}
def Create(folder):
try:
pg = ParseGraph()
if not os.path.exists(folder):
print("folder not exisit")
return None
if os.path.exists(folder + "/nodes"):
pg.LoadNodesFromDirectory(folder + "/nodes")
if os.path.exists(folder + "/edges"):
pg.LoadEdgesFromDirectory(folder + "/edges")
except:
print("Failed to create Parse Graph")
return None
else:
return pg
def Nodes(self):
nodes = []
nodes.extend(self.nodeDict.values)
return nodes
def Edges(self):
edges = []
edges.extend(self.edgeDict.values)
return edges
def LoadNodesFromDirectory(self, folder):
for root, dirs, files in os.walk(folder):
for f in files:
self.LoadNodeFromFile(os.path.join(root, f))
def LoadEdgesFromDirectory(self, folder):
for root, dirs, files in os.walk(folder):
for f in files:
self.LoadEdgeFromFile(os.path.join(root, f))
def LoadNodeFromFile(self, file):
try:
node = Node.Create(file)
if node == None:
print("No node created")
return None
self.AddNode(node)
except:
print("Failed to create node from " + file)
def LoadEdgeFromFile(self, file):
try:
edges = Edge.Create(file)
if edges == None:
print("No edge created")
return None
for edge in edges:
self.AddEdge(edge)
except:
print("Failed to create edge from " + file)
def createProtocolHeader(self, name):
if name in self.nodeDict:
return ProtocolHeader(self.nodeDict[name])
return None
def GetNode(self, name):
if name in self.nodeDict:
return self.nodeDict[name]
return None
def GetEdge(self, start, end):
key = start + "-" + end
if key in self.edgeDict:
return self.edgeDict[key]
return None
def AddNode(self, node):
if node.Name in self.nodeDict:
print("Warning: node {0} already exist", node.Name)
self.nodeDict[node.Name] = node
def AddEdge(self, edge):
key = edge.Start + "-" + edge.End
if key in self.edgeDict:
print("Warning: edge {0} already exist", key)
self.edgeDict[key] = edge
def Forge(self, path):
headerList = []
# set field value/mask
for headerConfig in path.stack:
header = self.createProtocolHeader(headerConfig.Header)
if header == None:
return None
for hcf in headerConfig.fields:
attr = False
if not header.SetField(hcf.Name, hcf.Value):
if not header.SetAttribute(hcf.Name, hcf.Value):
print("failed to set value of " + hcf.Name)
return None
else:
attr = True
if not attr and not header.SetMask(hcf.Name, hcf.Mask):
print("failed to set mask of " + hcf.Name)
return None
header.Adjust()
headerList.append(header)
# apply edge actions and length autoincrease
for i in range(1, len(headerList)):
start = headerList[i - 1]
end = headerList[i]
edge = self.GetEdge(start.Name(), end.Name())
if edge == None:
print("no edge exist for {0}, {1}", start.Name, end.Name)
return None
edge.Apply(start, end)
increase = end.GetSize()
for j in range(i):
headerList[j].AppendAuto(increase)
# resolve buffer
pktLen = 0
for header in headerList:
header.Resolve()
pktLen += len(header.Buffer)
# join buffer
pktbuf = []
mskbuf = []
offset = 0
for header in headerList:
pktbuf.extend(header.Buffer)
mskbuf.extend(header.Mask)
offset += len(header.Buffer)
result = ForgeResult(headerList, pktbuf, mskbuf)
return result
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