KAUST_CS231_Project, To build a proxy server

Welcome to push issues in GitHub! 🥰

• Assumptions
• How to Run it
• Functionality
• Avoid Being Attacked

• The user can only access the Proxy Ports. the configuration file is unknown and untouchable for the user
• For convenience, we only consider proxies are running on only 1 machine but with different ports, the same as backend.
• The configuration file is right, without being corrupted. Because it's invisible to users.

git clone https://github.com/damaoooo/KAUST_CS231_Project
cd KAUST_CS231_Project

The program will automatically read config.json in the same directory.

Run the Proxy

python proxy.py <--allow_local>

--allow_local means whether you allow the traffic from 127.0.0.1 . By default, it's true. if not very interested in it, you don't need to provide it to the program.

Run the Backend

python proxy.py

{
  "proxy": [
    {"ip":  "127.0.0.1", "port":  11451},
    {"ip":  "127.0.0.1", "port":  11452}
  ],
  "backend": [
    {"ip": "127.0.0.1", "port":  11453},
    {"ip": "127.0.0.1", "port":  11454}
  ],
  "key": "123456"
}

You can modify to meet your requirement. Just follow the sample format.

just use the native client.

nc <ip> <port>
e.g.
nc 127.0.0.1 11451

For test, you can use the python file in the client_for_test directory, but it is the same functionality as nc.

python client_for_test/bad_client_LI.py --ip 127.0.0.1 --port 11451

                 +---------+     +----------+  
                 |  proxy1 |     | backend1 |  
                 +---------+     +----------+  
+--------+                                     
|  user  |                                     
+--------+       +---------+     +----------+  
                 |  proxy2 |     | backend2 |  
                 +---------+     +----------+                                

User can contact to Proxy 1-n, then ask the Proxy to forward the request to Backend 1-n. Then the result will be returned to the user.

IP Port Num1 Num2
1.1.1.1 5050 1 2

• the length of input must be smaller than 100
• Num can be HEX, like 0x1234abcd, can be FLOAT, like 1.23, can be INT, like 123
• FLOAT will be round(num, 5), so 0.000001 will be INT 0
• Don't support Complex Number

Res1 Res2

• Res1 is Num1 / Num2, the result will round to 5 digits.
• If Num1 and Num2 are integers, then the result will be (Num1 ^ Num2) % 0xffffffff, if one of Num1 or Num2 is float number, Res2 is Num1 ^ Num2. Then, the result will directly output

• SYN Flood. Open the Syn Cookie(Linux) sysctl -w net.ipv4.tcp_syncookies=1
• Max QPS is 100 for new user in proxy. For connections that already established, it depends on the hardware

├── README.md
├── backend.py
├── client_for_test
│   ├── bad_client_LI.py
│   └── good_client_LI.py
├── config.cfg
├── proxy.py
├── test_all.py
└── utils.py