https://github.com/matsumotory/tcp_save_syn_listen

listen() with TCP_SAVE_SYN using LD_PRELOAD
https://github.com/matsumotory/tcp_save_syn_listen

Last synced: about 2 months ago
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listen() with TCP_SAVE_SYN using LD_PRELOAD

• Host: GitHub
• URL: https://github.com/matsumotory/tcp_save_syn_listen
• Owner: matsumotory
• License: mit
• Created: 2020-07-31T02:48:57.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2020-07-31T06:18:21.000Z (over 4 years ago)
• Last Synced: 2024-10-18T18:19:03.635Z (3 months ago)
• Language: C
• Size: 8.79 KB
• Stars: 2
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# tcp_save_syn_listen

Change sys_listen() to listen() with TCP_SAVE_SYN using LD_PRELOAD

## Build

```

make

```

## Usage

```

LD_PRELOAD=src/tcp_save_syn_listen.so ./your_app

```

## Example 

```

cd test

make

# server don't use TCP_SAVE_SYN

./server

```

- other terminal

```

cd test

./client

```

- result

```

./server

tcpriv[info]: waiting...

tcpriv[info]: connected: 192.168.0.2

tcpriv[info]: syn_len: 0

server: server.c:112: read_saved_syn: Assertion `syn_len == 60' failed.

Aborted (core dumped)

```

However, if you use tcp_save_syn_listen, ./server's listen() set TCP_SAVE_SYN to socket automatically

```

LD_PRELOAD=./tcp_save_syn_listen/src/tcp_save_syn_listen.so ./server

tcpriv[info]: waiting...

tcpriv[info]: connected: 192.168.0.2

tcpriv[info]: syn_len: 60

tcpriv[info]: found tcpriv's information: kind=254 length=10 ExID=0xf991 uid=1000

tcpriv[info]: all test success.

```