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# Chatty
The idea is the following:
- tcp server that you can send messages to
- history upon connecting
- date of messages sent
- client for reading the messages and sending them at the same time
- rooms
- encryption
- authentication
## client
- [ ] BUG: text is not appearing after typing
- [ ] BUG: when connecting two clients of the same account
- [ ] BUG: wrapping does not work and displays nothing if there is no screen space
- [ ] BUG: reconnect does not work when server does not know id
- [ ] TODO: Convert tabs to spaces
- [ ] BUG: when using lots of markup characters
- [ ] TODO: Newline support
- [ ] resizable box
## server
- [ ] check that fds arena does not overflow
- free clients which disconnected and use free list to give them space
- [ ] check if when sending and the client is offline (due to connection loss) what happens
- [ ] timeout on recv?
- [ ] use threads to handle clients/ timeout when receiving because a client could theoretically
stall the entire server.
- [ ] do not crash on errors from clients
- implement error message?
- timeout on recv with setsockopt
- [ ] theoretically two clients can connect at the same time. The uni/bi connections should be
negotiated.
## common
- [ ] use IP address / domain
- [ ] chat history
- [ ] rooms
- [ ] compression
## Protocol
- see `protocol.h` for more info
- The null terminator must be sent with the string.
- The text can be arbitrary length
## Keybinds
- `Ctrl+C` | `Ctrl+D`: quits
- `Ctrl+U`: Erase input line
- `Ctrl+W`: Erase word behind cursor
- `Ctrl+Y`: Paste clipboard into input field
## Resources I used for building this
- source code I looked at:
- https://github.com/git-bruh/matrix-tui
- https://github.com/NikitaIvanovV/ictree
- https://github.com/termbox/termbox2
- *mmap & gdb*: [Tsoding - "Why linux has this syscall?" ](https://youtu.be/sFYFuBzu9Ow?si=CX32IzFVA8OPDZvS)
- *pthreads*: [C for dummies](https://c-for-dummies.com/blog/?p=5365)
- *unicode and wide characters*: [C for dummies](https://c-for-dummies.com/blog/?p=2578)
- *sockets*: [Nir Lichtman - Making Minimalist Chat Server in C on Linux](https://www.youtube.com/watch?v=gGfTjKwLQxY)
- syscall manpages `man`
- UTF8 Comprssion: [Casey Muratori - Simple RLE Compressor](https://www.youtube.com/watch?v=kikLEdc3C1c&t=6312s)
### To Read
#### C Programming
- https://www.youtube.com/watch?v=wvtFGa6XJDU
- https://nullprogram.com/blog/2023/02/11/
- https://nullprogram.com/blog/2023/02/13/
- https://nullprogram.com/blog/2023/10/08/
#### Encryption w/ Compression
- https://en.wikipedia.org/wiki/BREACH
- https://en.wikipedia.org/wiki/CRIME
- https://crypto.stackexchange.com/questions/2283/crypto-compression-algorithms
- openpgp https://www.rfc-editor.org/rfc/rfc4880
- https://security.stackexchange.com/questions/19911/crime-how-to-beat-the-beast-successor
- https://blog.qualys.com/product-tech/2012/09/14/crime-information-leakage-attack-against-ssltls
- Algorithms:
*Symmetric*
- AESI
- Blowfish
- Twofish
- Rivest Cipher (RC4)
*Assymetric*
- Data Encryption Standard (DES)
- ECDSA
- RSA
- Diffie-Hellman
- PGP
_Hash_
- Deflate
- Huffman Coding
- LZ77
Other
- ChaCha20-Poly1305
- AES(-GCM)
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