如何在Python中重组TCP数据包？

pip install dpkt

import dpkt
import socket

def reassemble_tcp_packet(ip_packets):
    # 创建一个字典来存储TCP流
    tcp_streams = {}

    # 遍历IP数据包
    for ip_packet in ip_packets:
        # 获取TCP数据包
        tcp_packet = ip_packet.data

        # 获取TCP流的键
        key = (ip_packet.src, tcp_packet.sport, ip_packet.dst, tcp_packet.dport)

        # 如果TCP流不存在，则创建一个新的TCP流
        if key not in tcp_streams:
            tcp_streams[key] = dpkt.tcp.TCP()

        # 将TCP数据包添加到TCP流中
        tcp_streams[key].data += tcp_packet.data

    return tcp_streams

# 从捕获的数据包中提取IP数据包
def extract_ip_packets(pcap_file):
    ip_packets = []
    for ts, buf in dpkt.pcap.Reader(open(pcap_file, 'rb')):
        eth = dpkt.ethernet.Ethernet(buf)
        if eth.type == dpkt.ethernet.ETH_TYPE_IP:
            ip_packets.append(eth.data)
    return ip_packets

# 使用示例
pcap_file = 'path/to/your/pcap/file.pcap'
ip_packets = extract_ip_packets(pcap_file)
tcp_streams = reassemble_tcp_packet(ip_packets)

# 打印重组后的TCP数据包
for key, tcp_stream in tcp_streams.items():
    print(f'TCP Stream: {key}')
    print(tcp_stream.data)