mirror of
https://github.com/m1ngsama/TNT.git
synced 2025-12-24 10:51:41 +00:00
m1ngsama
a4d67be103
- Implement SSH server using libssh for secure connections - Replace insecure telnet with encrypted SSH protocol - Add automatic terminal size detection via PTY requests - Support dynamic window resize (SIGWINCH handling) - Fix UI display bug by using SSH channel instead of fd - Update tui_clear_screen to work with SSH connections - Add RSA host key auto-generation on first run - Update README with SSH instructions and security notes - Add libssh dependency to Makefile with auto-detection - Remove all telnet-related code Security improvements: - All traffic now encrypted - Host key authentication - No more plaintext transmission
134 lines
3.1 KiB
Markdown
134 lines
3.1 KiB
Markdown
# TNT
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**TNT's Not Tunnel** - A lightweight terminal chat server written in C
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## Features
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- ✨ **Vim-style operations** - INSERT/NORMAL/COMMAND modes
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- 📜 **Message history** - Browse with j/k keys
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- 🕐 **Full timestamps** - Year-month-day hour:minute with timezone
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- 📖 **Bilingual help** - Press ? for Chinese/English help
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- 🌏 **UTF-8 support** - Full support for Chinese, Japanese, Korean
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- 📦 **Single binary** - Lightweight executable
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- 🔒 **SSH access** - Secure encrypted connections
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- 🖥️ **Auto terminal detection** - Adapts to your terminal size
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- 💾 **Message persistence** - All messages saved to log file
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- ⚡ **Low resource usage** - Minimal memory and CPU
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## Building
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**Dependencies:**
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- libssh (required for SSH support)
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**Install dependencies:**
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```bash
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# On macOS
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brew install libssh
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# On Ubuntu/Debian
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sudo apt-get install libssh-dev
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# On Fedora/RHEL
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sudo dnf install libssh-devel
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```
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**Build:**
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```bash
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make
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```
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For debug build:
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```bash
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make debug
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```
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## Running
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```bash
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./tnt
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```
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Connect from another terminal:
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```bash
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ssh -p 2222 localhost
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```
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The server will prompt for a password (any password is accepted) and then ask for your username.
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## Usage
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### Operating Modes
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- **INSERT** - Type and send messages (default)
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- **NORMAL** - Browse message history
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- **COMMAND** - Execute commands
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### Keyboard Shortcuts
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#### INSERT Mode
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- `ESC` - Enter NORMAL mode
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- `Enter` - Send message
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- `Backspace` - Delete character
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- `Ctrl+C` - Exit
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#### NORMAL Mode
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- `i` - Return to INSERT mode
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- `:` - Enter COMMAND mode
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- `j` - Scroll down (older messages)
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- `k` - Scroll up (newer messages)
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- `g` - Jump to top
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- `G` - Jump to bottom
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- `?` - Show help
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- `Ctrl+C` - Exit
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#### COMMAND Mode
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- `Enter` - Execute command
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- `ESC` - Cancel, return to NORMAL
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- `Backspace` - Delete character
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### Available Commands
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- `list`, `users`, `who` - Show online users
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- `help`, `commands` - Show available commands
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- `clear`, `cls` - Clear command output
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## Architecture
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- **Network**: Multi-threaded SSH server using libssh
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- **TUI**: ANSI escape sequences with automatic terminal size detection
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- **Storage**: Append-only log file
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- **Concurrency**: pthread + rwlock
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- **Security**: Encrypted SSH connections with host key authentication
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## Configuration
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Set port via environment variable:
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```bash
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PORT=3333 ./tnt
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```
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## Technical Details
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- Written in C11
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- POSIX-compliant
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- Thread-safe operations
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- Proper UTF-8 handling for CJK characters
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- Box-drawing characters for UI
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- SSH protocol with PTY support for terminal size detection
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- Dynamic window resize handling
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## Security
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- **Encrypted connections**: All traffic is encrypted via SSH
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- **Host key authentication**: RSA host key generated on first run
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- **Password authentication**: Currently accepts any password (customize for production)
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- **Host key persistence**: Stored in `host_key` file
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- **No plaintext**: Unlike telnet, all data is encrypted in transit
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## License
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MIT License - see LICENSE file
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