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DDoSDefender.go
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DDoSDefender.go
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package main
import (
"fmt"
"net"
"net/http"
"sync"
"time"
"github.com/yourusername/ratelimit" // Replace with the actual import path
)
// Define rate limiting parameters.
const (
rateLimitInterval = time.Second // Rate limiting interval
rateLimitCapacity = 10 // Maximum requests allowed per second per IP
)
var (
// Create a token bucket for rate limiting.
rateLimiter = ratelimit.NewBucket(rateLimitInterval, rateLimitCapacity)
// IP Whitelist: Add trusted IP addresses here.
ipWhitelist = []string{"127.0.0.1", "192.168.1.1"}
// IP Blacklist: Add known malicious IP addresses here.
ipBlacklist = []string{"10.0.0.1", "10.0.0.2"}
// Mutex for concurrent access to IP blacklist.
ipMutex sync.Mutex
)
func main() {
// Start an HTTP server that enforces rate limiting and IP filtering.
http.HandleFunc("/", rateLimitMiddleware(IPFilterMiddleware(handleRequest)))
http.ListenAndServe(":8080", nil)
}
func handleRequest(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Hello, world!\n")
}
// IPFilterMiddleware checks if the client's IP is in the whitelist or blacklist.
// If the IP is in the blacklist, it returns a 403 Forbidden response.
// If the IP is not in the whitelist, it passes the request to the next middleware.
func IPFilterMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
clientIP := getClientIP(r)
ipMutex.Lock()
defer ipMutex.Unlock()
// Check if the IP is in the blacklist.
for _, bannedIP := range ipBlacklist {
if clientIP == bannedIP {
http.Error(w, "Forbidden", http.StatusForbidden)
return
}
}
// Check if the IP is in the whitelist.
for _, allowedIP := range ipWhitelist {
if clientIP == allowedIP {
next.ServeHTTP(w, r)
return
}
}
// If the IP is not in either list, allow the request.
next.ServeHTTP(w, r)
})
}
// rateLimitMiddleware enforces rate limiting for incoming requests.
func rateLimitMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Limit requests based on the client's IP address.
clientIP := getClientIP(r)
waitTime := rateLimiter.Take(1)
// Check if the request exceeded the rate limit.
if waitTime > 0 {
http.Error(w, fmt.Sprintf("Rate limit exceeded. Try again in %s", waitTime), http.StatusTooManyRequests)
return
}
// Continue processing the request.
next.ServeHTTP(w, r)
})
}
// getClientIP extracts the client's IP address from the request.
func getClientIP(r *http.Request) string {
ip, _, err := net.SplitHostPort(r.RemoteAddr)
if err != nil {
return r.RemoteAddr
}
return ip
}