Added handler for HTTP2/PRI

Author: Beeram12

protocols/protocols.go

@@ -75,7 +75,7 @@ func MapTCPProtocolHandlers(log interfaces.Logger, h interfaces.Honeypot) map[st
 			return nil
 		}
 		// poor mans check for HTTP request
-		httpMap := map[string]bool{"GET ": true, "POST": true, "HEAD": true, "OPTI": true, "CONN": true}
+		httpMap := map[string]bool{"GET ": true, "POST": true, "HEAD": true, "OPTI": true, "CONN": true,"PRI": true}
 		if _, ok := httpMap[strings.ToUpper(string(snip))]; ok {
 			return tcp.HandleHTTP(ctx, bufConn, md, log, h)
 		}

protocols/tcp/http.go

@@ -123,7 +123,15 @@ func HandleHTTP(ctx context.Context, conn net.Conn, md connection.Metadata, logg
 			logger.Error("Failed to close the HTTP connection", producer.ErrAttr(err))
 		}
 	}()
-
+	
+	reader := bufio.NewReader(conn)
+	preface,err := reader.Peek(24)
+	if err==nil && bytes.Equal(preface, []byte("PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n")){
+		settingsFrame := []byte("\x00\x00\x00\x04\x00\x00\x00\x00\x00")
+		_,_ = conn.Write(settingsFrame)
+		return conn.Close()
+	}
+	
 	req, err := http.ReadRequest(bufio.NewReader(conn))
 	if err != nil {
 		return fmt.Errorf("failed to read the HTTP request: %w", err)