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# Siege durak/Podkidnoy (Throw-in) durak
<img src="durak.png" />
## Description
This is a network-based console version of the classic Russian card game
"Podkidnoy Durak" (Throw-in Fool). Both the client and server are written in
pure C.
TCP/IP sockets are used for network communication, enabling reliable data
transfer via `read` and `write` system calls. The client and server follow an
event-driven programming model using `select()` for I/O multiplexing.
## Gameplay
- Card suits: `%`, `#`, `v`, `^`
- Card ranks: `2`, `3`, `4`, `5`, `6`, `7`, `8`, `9`, `10`, `J`, `Q`, `K`, `A`
- Game phases: attack, defense, and throw-in
The game supports dynamic throw-ins based on real-time player reactions —
whoever throws first, their card is accepted.
## Hint system
Players receive visual hints based on their role:
- Attacker: all cards of matching rank
- Defender: cards that beat the attacking one (higher of same suit or trump)
- Thrower: cards of the same rank as those already on the table
Players may press `Enter` to either surrender the defense or skip the throw-in phase.
The server analyzes each phase:
- Determines whether the defender can beat the attack
- If defense fails, transitions to the throw-in phase
- If no throw-in is possible, moves to the next attack phase
During defense, the defender sees only one attacking card at a time (others see all cards).
## Game State Machine (ASCII Diagram)
```text
+-----------------+
| ATTACK |
| (attacker plays)|
+--------+--------+
|
v
+-----------------+
| DEFENSE |
| (defender tries |
| to beat cards)|
+--------+--------+
|
v
+----------------------------+
| CAN OTHERS THROW-IN? |
| (same rank as on table) |
+------+----------+----------+
|YES |NO
v \
+-----------------+ \
| THROW-IN QUEUE | \
| | \
| - If defender | \
| already failed| \
| ≥1 card → | v
| put all queued| +----------------------------+
| cards on table| | DEFENSE RESULT? |
| → check again | | - SUCCESS: defender becomes |
| | | next attacker |
| - If still | | - FAIL: player after |
| defending well| | defender attacks next |
| → throw 1 card| +----------------------------+
| → DEFENSE |
+-----------------+
```
## Features & Technologies
### Technologies
- C programming language — for both client and server
- POSIX sockets — TCP/IP networking
- `select()` system call — event-driven I/O
- Cross-platform — Linux, Windows, Android (via Termux)
- Finite State Machine (FSM) for game phase control
- Session tracking for each connected client
- Separate adapted Windows client derived from the Linux version
### Gameplay Features
- Full support for "Podkidnoy Durak" rules: attack, defense, throw-in
- Real-time interaction: whoever throws a card first wins the throw-in
- Turn-based logic, respecting the rules of defending, beating, or taking cards
- Hint system based on player role:
- Attacker — cards of matching rank
- Defender — suitable beating cards
- Thrower — cards matching any on the table
- Game logic transparency — only defender sees current attack card; others see all
- Supports multiple clients connected to the same server in real time
- Automatic phase switching based on server logic without client-side decision delays
## Building
### On Linux (MacOS, FreeBSD, Android)
```
git clone https://git.scratko.xyz/durak
cd durak/linux_client
make
./client
```
Note: On Android, use a terminal like `Termux`, and install packages: `clang`, `make`, `git`.
### On Windows
You can download a prebuilt Windows version with the server IP preset:
Windows version: <a href="https://scratko.xyz/games/durak.exe" target="_blank">Download</a>
### Hosting Your Own Server
1. Build and run the server:
```
./server 1025
```
Choose a free port (≥1024).
2. Configure the client:
Open `linux_client/client.c` or `windows_client/client.c`:
- Line 14: set your server IP address (e.g., 127.0.0.1 for local)
- Line 15: set the same port used above
3. Build and run the client (no arguments required).
---
Questions? Contact: m@scratko.xyz
|
