Remote Proxy For Http Injector May 2026

GET http://injector.example.com/ HTTP/1.1 Host: injected.host.com X-Real-Host: target.com:443 We need to parse the real destination from custom headers. package main import ( "bufio" "bytes" "io" "log" "net" "net/http" "strings" )

type connPool struct { sync.Mutex conns map[string][]net.Conn } func (p *connPool) Get(addr string) net.Conn { p.Lock() defer p.Unlock() if pool, ok := p.conns[addr]; ok && len(pool) > 0 { conn := pool[len(pool)-1] p.conns[addr] = pool[:len(pool)-1] return conn } return nil }

// Hijack the client connection hijacker, ok := w.(http.Hijacker) if !ok { http.Error(w, "Hijacking not supported", http.StatusInternalServerError) return } clientConn, _, err := hijacker.Hijack() if err != nil { http.Error(w, err.Error(), http.StatusServiceUnavailable) return } defer clientConn.Close() remote proxy for http injector

func extractDestination(r *http.Request) (string, error) { // Priority 1: X-Real-Host header (common in custom payloads) if realHost := r.Header.Get("X-Real-Host"); realHost != "" { return realHost, nil } // Priority 2: Host header if r.Host != "" { return r.Host, nil } // Priority 3: Parse from URL (if GET/POST) if r.URL.Host != "" { return r.URL.Host, nil } return "", fmt.Errorf("no destination found") }

func main() { flag.Parse() http.HandleFunc("/", handle) log.Printf("Remote proxy listening on %s", *listenAddr) log.Fatal(http.ListenAndServe(*listenAddr, nil)) } Build: GET http://injector

func handle(w http.ResponseWriter, r *http.Request) { dest := r.Header.Get("X-Real-Host") if dest == "" { dest = r.Host } if dest == "" { http.Error(w, "Missing destination", 400) return }

func main() { http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { // Handle both CONNECT and normal HTTP requests with custom payload if r.Method == http.MethodConnect { handleInjectorTunnel(w, r) return } handleInjectorTunnel(w, r) // also handle GET/POST injector payloads }) ok := p.conns[addr]

Example payload from Injector: