107 lines
2.5 KiB
C++
107 lines
2.5 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#pragma once
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#include "base/weak_ptr.h"
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#include <QtCore/QPointer>
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#include <QtNetwork/QNetworkReply>
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#include <optional>
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namespace MTP::details {
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[[nodiscard]] const std::vector<QString> &DnsDomains();
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[[nodiscard]] QString GenerateDnsRandomPadding();
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[[nodiscard]] QByteArray DnsUserAgent();
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struct DnsEntry {
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QString data;
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crl::time TTL = 0;
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};
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[[nodiscard]] std::vector<DnsEntry> ParseDnsResponse(
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const QByteArray &bytes,
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std::optional<int> typeRestriction = std::nullopt);
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struct ServiceWebRequest {
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ServiceWebRequest(not_null<QNetworkReply*> reply);
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ServiceWebRequest(ServiceWebRequest &&other);
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ServiceWebRequest &operator=(ServiceWebRequest &&other);
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~ServiceWebRequest();
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void destroy();
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QPointer<QNetworkReply> reply;
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};
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class DomainResolver : public QObject {
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public:
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DomainResolver(Fn<void(
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const QString &domain,
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const QStringList &ips,
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crl::time expireAt)> callback);
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void resolve(const QString &domain);
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private:
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enum class Type {
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Mozilla,
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Google,
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};
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struct Attempt {
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Type type;
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QString data;
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QString host;
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};
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struct AttemptKey {
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QString domain;
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bool ipv6 = false;
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inline bool operator<(const AttemptKey &other) const {
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return (domain < other.domain)
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|| (domain == other.domain && !ipv6 && other.ipv6);
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}
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inline bool operator==(const AttemptKey &other) const {
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return (domain == other.domain) && (ipv6 == other.ipv6);
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}
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};
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struct CacheEntry {
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QStringList ips;
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crl::time expireAt = 0;
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};
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struct Attempts {
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std::vector<Attempt> list;
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base::has_weak_ptr guard;
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};
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void resolve(const AttemptKey &key);
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void sendNextRequest(const AttemptKey &key);
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void performRequest(const AttemptKey &key, const Attempt &attempt);
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void checkExpireAndPushResult(const QString &domain);
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void requestFinished(
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const AttemptKey &key,
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not_null<QNetworkReply*> reply);
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QByteArray finalizeRequest(
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const AttemptKey &key,
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not_null<QNetworkReply*> reply);
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Fn<void(
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const QString &domain,
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const QStringList &ips,
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crl::time expireAt)> _callback;
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QNetworkAccessManager _manager;
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std::map<AttemptKey, Attempts> _attempts;
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std::map<AttemptKey, std::vector<ServiceWebRequest>> _requests;
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std::map<AttemptKey, CacheEntry> _cache;
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crl::time _lastTimestamp = 0;
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};
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} // namespace MTP::details
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