70 lines
2.7 KiB
Swift
70 lines
2.7 KiB
Swift
import Darwin
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import Foundation
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import Localization
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/// 常用公共 DNS。只用 IPv4 地址：没有 IPv6 的网络里写入 IPv6 服务器会拖慢解析
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public enum DNSPreset: String, CaseIterable, Identifiable, Sendable {
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case automatic, cloudflare, google, tencent, aliyun
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public var id: String { rawValue }
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public var title: String {
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switch self {
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case .automatic: tr("自动")
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case .cloudflare: "Cloudflare"
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case .google: "Google"
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case .tencent: tr("腾讯 DNSPod")
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case .aliyun: tr("阿里云")
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}
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}
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public var servers: [String] {
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switch self {
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case .automatic: []
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case .cloudflare: ["1.1.1.1", "1.0.0.1"]
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case .google: ["8.8.8.8", "8.8.4.4"]
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case .tencent: ["119.29.29.29", "182.254.116.116"]
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case .aliyun: ["223.5.5.5", "223.6.6.6"]
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}
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}
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/// 当前手动设置的地址与哪个预设一致；无手动地址即“自动”
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public static func matching(_ servers: [String]) -> DNSPreset? {
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allCases.first { $0.servers == servers }
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}
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}
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public enum DNSConfiguration {
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public static let maxServers = 6
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/// 只接受数字形式的 IPv4 / IPv6 地址
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public static func isValidAddress(_ text: String) -> Bool {
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var v4 = in_addr()
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var v6 = in6_addr()
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return inet_pton(AF_INET, text, &v4) == 1 || inet_pton(AF_INET6, text, &v6) == 1
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}
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/// 把用户输入（逗号、空格或换行分隔）拆成地址列表；有无效地址时返回 nil
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public static func parse(_ input: String) -> [String]? {
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let parts = input.split { $0 == "," || $0 == "，" || $0.isWhitespace }.map(String.init)
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guard parts.count <= maxServers, parts.allSatisfy(isValidAddress) else { return nil }
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return parts
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}
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/// 服务名来自系统，可能包含空格或引号；只拒绝控制字符
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public static func isValidServiceName(_ name: String) -> Bool {
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!name.isEmpty && name.count <= 128 && !name.unicodeScalars.contains { CharacterSet.controlCharacters.contains($0) }
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}
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public static func networksetupArguments(service: String, servers: [String]) -> [String] {
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["-setdnsservers", service] + (servers.isEmpty ? ["Empty"] : servers)
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}
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/// 未安装辅助工具时通过管理员授权执行的 shell 命令。服务名按单引号转义，地址已校验为纯数字形式
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public static func shellCommand(service: String, servers: [String]) -> String {
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let quoted = "'" + service.replacingOccurrences(of: "'", with: "'\\''") + "'"
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let arguments = ["-setdnsservers", quoted] + (servers.isEmpty ? ["Empty"] : servers)
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return (["/usr/sbin/networksetup"] + arguments).joined(separator: " ")
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}
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}
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