# art049/simple-buffer-overflow-server architecture

> Architecture diagram of the GitHub repository art049/simple-buffer-overflow-server, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-09-28). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/art049/simple-buffer-overflow-server
- Repository: https://github.com/art049/simple-buffer-overflow-server

## Overview

This is a small C stack-buffer-overflow challenge, not a network server in the sampled runtime: `main()` calls an interactive echo loop that reads into a 20-byte stack buffer without a length limit. The README mentions a TCP-server mode, but its implementation is not present in the sampled source, so that capability is not mapped. The challenge’s intended result is control-flow hijacking to run arbitrary code; `secretFunction()` is a visible demonstration target. The graph shows only behavior supported by `main.c`.

Main entry points: [`main.c`](https://github.com/art049/simple-buffer-overflow-server/blob/master/main.c) (Echo loop)

## Diagram (Mermaid)

```mermaid
flowchart TD

node_user(("User"))
node_main["Program entry<br/>[main.c]"]
node_echo["Echo loop<br/>[main.c]"]
node_stack_buffer["Stack buffer<br/>[main.c]"]
node_secret_function["Secret function<br/>[main.c]"]
node_terminal["Standard I/O"]

node_user -->|"runs"| node_main
node_main -->|"calls"| node_echo
node_echo -->|"prompts and reads"| node_terminal
node_terminal -->|"input overflows"| node_stack_buffer
node_echo -->|"prints contents"| node_stack_buffer
node_stack_buffer -.->|"may redirect control"| node_secret_function

click node_main "https://github.com/art049/simple-buffer-overflow-server/blob/master/main.c"
click node_echo "https://github.com/art049/simple-buffer-overflow-server/blob/master/main.c"
click node_stack_buffer "https://github.com/art049/simple-buffer-overflow-server/blob/master/main.c"
click node_secret_function "https://github.com/art049/simple-buffer-overflow-server/blob/master/main.c"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_user toneBlue
class node_main,node_echo,node_stack_buffer,node_secret_function toneTeal
class node_terminal toneIndigo
```

## Components

### Other components

- **User**
- [Program entry](https://github.com/art049/simple-buffer-overflow-server/blob/master/main.c): `main.c`
- [Echo loop](https://github.com/art049/simple-buffer-overflow-server/blob/master/main.c): `main.c`
- [Stack buffer](https://github.com/art049/simple-buffer-overflow-server/blob/master/main.c): `main.c`
- [Secret function](https://github.com/art049/simple-buffer-overflow-server/blob/master/main.c): `main.c`
- **Standard I/O**

## Connections

- User → Program entry: runs
- Program entry → Echo loop: calls
- Echo loop → Standard I/O: prompts and reads
- Standard I/O → Stack buffer: input overflows
- Echo loop → Stack buffer: prints contents
- Stack buffer → Secret function: may redirect control