IP分片重组功能的模拟实现代码
时间: 2024-06-14 13:08:17 浏览: 17
IP分片重组功能是指将一个IP数据报分成多个片段进行传输,然后在目的地重新组装成完整的数据报。下面是一个简单的模拟实现代码示例:
```python
class IPFragment:
def __init__(self, id, offset, data):
self.id = id
self.offset = offset
self.data = data
class IPReassembler:
def __init__(self):
self.fragments = {}
def add_fragment(self, fragment):
if fragment.id not in self.fragments:
self.fragments[fragment.id] = []
self.fragments[fragment.id].append(fragment)
def is_complete(self, id):
if id not in self.fragments:
return False
total_length = sum([len(fragment.data) for fragment in self.fragments[id]])
last_fragment = self.fragments[id][-1]
if last_fragment.offset + len(last_fragment.data) >= total_length:
return True
return False
def reassemble(self, id):
if not self.is_complete(id):
return None
fragments = self.fragments[id]
fragments.sort(key=lambda x: x.offset)
data = b""
for fragment in fragments:
data += fragment.data
del self.fragments[id]
return data
```
使用示例:
```python
# 创建IP分片
fragment1 = IPFragment(id=1, offset=0, data=b"Hello")
fragment2 = IPFragment(id=1, offset=5, data=b" World")
# 创建IP分片重组器
reassembler = IPReassembler()
# 添加IP分片到重组器
reassembler.add_fragment(fragment1)
reassembler.add_fragment(fragment2)
# 检查是否完整
if reassembler.is_complete(1):
# 重组IP分片
data = reassembler.reassemble(1)
print(data.decode()) # 输出: Hello World
```
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