首先打开Wireshark，在联网的网卡上开始抓包过程，再用浏览器打开网页，关闭网页并结束抓包过程，然后将抓包内容保存为pcapng格式的文件。对上述pcapng文件，使用Scapy库或其他解析库，获取到tcp三报文连接或tcp四报文释放的信息，获取到相关信息后，再用Matplot库绘制三报文连接或四报文释放的过程

好的，下面是一个Python程序，用于解析pcapng文件并绘制TCP三次握手和四次挥手的过程。首先，我们需要安装必要的Python库：`scapy`和`matplotlib`。可以使用以下命令进行安装：

pip install scapy
pip install matplotlib

下面是完整的Python代码：

import matplotlib.pyplot as plt
import pandas as pd
from scapy.all import *

# 载入pcapng文件
packets = rdpcap('example.pcapng')

# 定义TCP连接的状态
CLOSED, LISTEN, SYN_SENT, SYN_RCVD, ESTABLISHED, FIN_WAIT_1, FIN_WAIT_2, CLOSE_WAIT, CLOSING, LAST_ACK, TIME_WAIT = range(11)

# 初始化TCP连接状态
state = CLOSED

# 定义三次握手和四次挥手的数据包数量
syn_count = 0
syn_ack_count = 0
ack_count = 0
fin_count = 0
fin_ack_count = 0

# 定义数据包时间戳和TCP序列号
timestamps = []
seq_nums = []

# 处理每个数据包
for packet in packets:
    if TCP in packet:
        tcp = packet[TCP]
        if tcp.flags & 0x02 and state == LISTEN:
            # 收到SYN，进入SYN_RCVD状态
            state = SYN_RCVD
            syn_count += 1
            timestamps.append(packet.time)
            seq_nums.append(tcp.seq)
        elif tcp.flags & 0x02 and state == CLOSED:
            # 发送SYN，进入SYN_SENT状态
            state = SYN_SENT
            syn_count += 1
            timestamps.append(packet.time)
            seq_nums.append(tcp.seq)
        elif tcp.flags & 0x10 and state == SYN_SENT:
            # 收到ACK，进入ESTABLISHED状态
            state = ESTABLISHED
            ack_count += 1
            timestamps.append(packet.time)
            seq_nums.append(tcp.seq)
        elif tcp.flags & 0x10 and state == SYN_RCVD:
            # 发送ACK，进入ESTABLISHED状态
            state = ESTABLISHED
            syn_ack_count += 1
            timestamps.append(packet.time)
            seq_nums.append(tcp.seq)
        elif tcp.flags & 0x01 and state == ESTABLISHED:
            # 发送FIN，进入FIN_WAIT_1状态
            state = FIN_WAIT_1
            fin_count += 1
            timestamps.append(packet.time)
            seq_nums.append(tcp.seq)
        elif tcp.flags & 0x10 and state == FIN_WAIT_1:
            # 收到ACK，进入FIN_WAIT_2状态
            state = FIN_WAIT_2
            ack_count += 1
            timestamps.append(packet.time)
            seq_nums.append(tcp.seq)
        elif tcp.flags & 0x01 and state == FIN_WAIT_2:
            # 收到FIN，进入TIME_WAIT状态
            state = TIME_WAIT
            fin_ack_count += 1
            timestamps.append(packet.time)
            seq_nums.append(tcp.seq)
        elif tcp.flags & 0x10 and state == TIME_WAIT:
            # 发送ACK，结束连接
            state = CLOSED
            ack_count += 1
            timestamps.append(packet.time)
            seq_nums.append(tcp.seq)

# 绘制TCP连接状态的时序图
df = pd.DataFrame({'timestamp': timestamps, 'seq_num': seq_nums})
df['state'] = state
df['event'] = ''
df.loc[df.state == SYN_RCVD, 'event'] = 'SYN'
df.loc[df.state == SYN_SENT, 'event'] = 'SYN'
df.loc[df.state == ESTABLISHED, 'event'] = 'ACK'
df.loc[df.state == FIN_WAIT_1, 'event'] = 'FIN'
df.loc[df.state == FIN_WAIT_2, 'event'] = 'ACK'
df.loc[df.state == TIME_WAIT, 'event'] = 'FIN'
df = df[['timestamp', 'event']]
df.plot(x='timestamp', y='event', drawstyle='steps-post')
plt.title('TCP Connection State')
plt.xlabel('Time (s)')
plt.ylabel('Event')
plt.show()

# 打印三次握手和四次挥手的数据包数量
print('SYN: {}  SYN-ACK: {}  ACK: {}'.format(syn_count, syn_ack_count, ack_count))
print('FIN: {}  FIN-ACK: {}'.format(fin_count, fin_ack_count))

这个程序将绘制TCP连接状态的时序图，并打印三次握手和四次挥手的数据包数量。希望对您有所帮助！