feat: dae trace (#435)

Co-authored-by: Sumire (菫) <151038614+sumire88@users.noreply.github.com>

trace/utils.go

@@ -0,0 +1,50 @@
+/*
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Copyright (c) 2022-2024, daeuniverse Organization <dae@v2raya.org>
+ */
+
+package trace
+
+import (
+	"encoding/binary"
+	"strings"
+)
+
+func Htons(x uint16) uint16 {
+	data := make([]byte, 2)
+	nativeEndian.PutUint16(data, x)
+	return binary.BigEndian.Uint16(data)
+}
+
+func Ntohs(x uint16) uint16 {
+	data := make([]byte, 2)
+	binary.BigEndian.PutUint16(data, x)
+	return nativeEndian.Uint16(data)
+}
+
+func TrimNull(s string) string {
+	return strings.TrimRight(s, "\x00")
+}
+
+func TcpFlags(data uint8) string {
+	flags := []string{}
+	if data&0b00100000 != 0 {
+		flags = append(flags, "U")
+	}
+	if data&0b00010000 != 0 {
+		flags = append(flags, ".")
+	}
+	if data&0b00001000 != 0 {
+		flags = append(flags, "P")
+	}
+	if data&0b00000100 != 0 {
+		flags = append(flags, "R")
+	}
+	if data&0b00000010 != 0 {
+		flags = append(flags, "S")
+	}
+	if data&0b00000001 != 0 {
+		flags = append(flags, "F")
+	}
+	return strings.Join(flags, "")
+}