122 lines
3.6 KiB
Swift
122 lines
3.6 KiB
Swift
////
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//// DNSUtil.swift
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//// punchnet
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////
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//// Created by 安礼成 on 2025/12/9.
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////
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//
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//import Foundation
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//import Network
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//
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//struct DNSUtil {
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// static let dnsServers: [String] = ["100.100.100.100"]
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// // dns请求包的目标地址
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// static let dnsDestIpAddr: UInt32 = 1684300900
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//
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// // 判断是否是dns请求的数据包
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// static func isDnsRequestPacket(ipPacket: IPPacket) -> Bool {
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// return ipPacket.header.destination == dnsDestIpAddr
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// }
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//
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// // DNS Header 结构
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// struct DNSHeader {
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// var id: UInt16
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// var flags: UInt16
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// var qdCount: UInt16
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// var anCount: UInt16
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// var nsCount: UInt16
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// var arCount: UInt16
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// }
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//
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// // DNS Question 结构
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// struct DNSQuestion {
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// var name: String
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// var type: UInt16
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// var qclass: UInt16
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// }
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//
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//
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//
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// // 解析域名（DNS Label 格式）
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// func parseName(from data: Data, offset: inout Int) -> String {
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// var labels: [String] = []
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// while true {
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// let length = Int(data[offset])
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// offset += 1
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// if length == 0 {
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// break
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// }
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// let labelData = data[offset..<(offset + length)]
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// if let label = String(data: labelData, encoding: .utf8) {
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// labels.append(label)
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// }
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// offset += length
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// }
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// return labels.joined(separator: ".")
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// }
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//
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// // 解析 DNS 请求包
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// func parseDNSRequest(_ data: Data) -> (DNSHeader, [DNSQuestion])? {
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// guard data.count >= 12 else { return nil } // DNS Header 固定 12 字节
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//
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// let header = DNSHeader(
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// id: data.uint16(at: 0),
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// flags: data.uint16(at: 2),
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// qdCount: data.uint16(at: 4),
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// anCount: data.uint16(at: 6),
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// nsCount: data.uint16(at: 8),
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// arCount: data.uint16(at: 10)
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// )
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//
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// var offset = 12
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// var questions: [DNSQuestion] = []
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//
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// for _ in 0..<header.qdCount {
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// let name = parseName(from: data, offset: &offset)
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// let type = data.uint16(at: offset)
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// offset += 2
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// let qclass = data.uint16(at: offset)
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// offset += 2
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//
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// let question = DNSQuestion(name: name, type: type, qclass: qclass)
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// questions.append(question)
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// }
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//
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// return (header, questions)
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// }
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//
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// // 测试示例
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// let dnsPacket: [UInt8] = [
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// 0x12, 0x34, // Transaction ID
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// 0x01, 0x00, // Flags
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// 0x00, 0x01, // QDCOUNT
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// 0x00, 0x00, // ANCOUNT
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// 0x00, 0x00, // NSCOUNT
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// 0x00, 0x00, // ARCOUNT
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// 0x03, 0x77, 0x77, 0x77, // w w w
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// 0x06, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, // g o o g l e
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// 0x03, 0x63, 0x6f, 0x6d, // c o m
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// 0x00, // End of name
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// 0x00, 0x01, // QTYPE A
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// 0x00, 0x01 // QCLASS IN
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// ]
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//
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// if let data = Data(exactly: dnsPacket), let (header, questions) = parseDNSRequest(data) {
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// print("Transaction ID: \(header.id)")
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// print("Flags: \(header.flags)")
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// print("Questions count: \(header.qdCount)")
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// for q in questions {
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// print("Question: \(q.name), type: \(q.type), class: \(q.qclass)")
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// }
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// }
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//
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//}
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//
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//// Helper 扩展：读取整数类型
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//private extension Data {
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// func uint16(at offset: Int) -> UInt16 {
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// let subdata = self[offset..<offset+2]
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// return subdata.withUnsafeBytes { $0.load(as: UInt16.self).bigEndian }
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// }
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//}
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