ratelimit

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Plug-and-play IP rate limiter in C

ratelimit 최신버젼 다운로드

최종 버전 다운로드 (.zip)

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# Rate Limiter

A lightweight C library for implementing rate limiting in applications using the Count-Min Sketch algorithm. This library efficiently tracks IP addresses and determines when they exceed a specified request rate threshold.

## How It Works

The library uses a Count-Min Sketch data structure with the following approach:

1. IP addresses are hashed to two positions in a fixed-size array using SipHash-2-4
2. Each hit increments counters at both positions
3. When checking if an IP should be rate-limited, the minimum of the two counters is used
4. Counters automatically decay over time to prevent indefinite growth

## Installation

Simply copy the `ratelimit.h` and `ratelimit.c` files into your project, or compile as a library.

## Usage

### Basic Example

```c
#include "ratelimit.h"
#include <netinet/in.h>

int main() {
    RateLimiter rl;
    unsigned char key[16] = {0}; // Should be random in real usage

// Initialize with 1024 slots and 2048 period
    if (ratelimiter_init(&rl, 1024, 2048, key) != 0) {
        return -1; // Error
    }

struct sockaddr_in client_addr;
    client_addr.sin_family = AF_INET;
    client_addr.sin_addr.s_addr = inet_addr("192.168.1.100");

// Check if client should be rate limited (more than 100 requests)
    int result = ratelimiter_hit(&rl, (struct sockaddr*)&client_addr, 100);

if (result > 0) {
        // Client should be rate limited
        printf("Rate limiting this client\n");
    } else if (result == 0) {
        // Client is under the limit
        printf("Request allowed\n");
    }

ratelimiter_free(&rl);
    return 0;
}
```

### Compilation

To compile with your application:

```bash
gcc -Wall -Wextra -o your_app your_app.c ratelimit.c
```

To compile and run the included test:

```bash
gcc -Wall -Wextra -o test_simple test_simple.c ratelimit.c
./test_simple
```

## API Reference

See [ratelimit.h](ratelimit.h) for full API documentation:

- `ratelimiter_init()`: Initialize a new rate limiter
- `ratelimiter_free()`: Free resources used by a rate limiter
- `ratelimiter_hit()`: Record a hit and check if rate limit is exceeded
- `ratelimiter_rekey()`: Change the hash key to redistribute entries

ratelimit

ratelimit 최신버젼 다운로드

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