使用MySQL client连接到MySQL server, 请求简单的Select, 而后断开, 在其过程中抓包, 解释如下内容:
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主机名
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ip地址
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对象
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端口
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liu-03
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10.186.64.137
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server
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3306
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liu-04
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10.186.64.138
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client
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server开启tcpdump
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client连接服务器并进行select
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[root@liu03 ~]# tcpdump tcp -i eth0 -t -s 0 -c 100 and port 3306 -w ./server.cap
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
^C54 packets captured
56 packets received by filter
0 packets dropped by kernel
[root@liu03 ~]#
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[root@liu04 ~]# mysql -h10.186.64.137 -P3306 -utest -p123456 -S /usr/local/mysql/data/mysql.sock
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 17
Server version: 8.0.15 MySQL Community Server - GPL
Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.
mysql> use employees;select * from departments limit 1;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
+---------+------------------+
| dept_no | dept_name |
+---------+------------------+
| d009 | Customer Service |
+---------+------------------+
1 row in set (0.00 sec)
mysql> quit
Bye
[root@liu04 ~]#
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（1）TCP的握手/断开
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看图中syn和ack的信息连接看出对应的TCP的握手和断开
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（2）MySQL连接的握手过程
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a) 服务端往客户端发送握手初始化包(Handshake Initialization Packet)
b) 客户端往服务端发送验证包(Client Authentication Packet)
c) 服务端往客户端发送成功包
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