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 /*
     This file is part of the KDE project
     SPDX-FileCopyrightText: 2000 Alex Zepeda <zipzippy@sonic.net>
     SPDX-FileCopyrightText: 2001 George Staikos <staikos@kde.org>
     SPDX-FileCopyrightText: 2001 Dawit Alemayehu <adawit@kde.org>
     SPDX-FileCopyrightText: 2007, 2008 Andreas Hartmetz <ahartmetz@gmail.com>
     SPDX-FileCopyrightText: 2022 Harald Sitter <sitter@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #ifndef _TCP_WORKERBASE_H
 #define _TCP_WORKERBASE_H
 
 #include <cstdio>
 #include <sys/types.h>
 
 #include "kiocore_export.h"
 #include <kio/workerbase.h>
 
 #include <memory>
 
 class QIODevice;
 class QSslSocket;
 
 namespace KIO
 {
 /**
  * @class KIO::TCPWorkerBase tcpworkerbase.h <KIO/TCPWorkerBase>
  *
  * A WorkerBase with convenience methods for TCP-connected storages.
  *
  * @since 5.99
  */
 class KIOCORE_EXPORT TCPWorkerBase : public WorkerBase
 {
 public:
     /**
      * Constructor.
      *
      * @param autoSsl if true, will automatically invoke startSsl() right after
      *                connecting. In the absence of errors the use of SSL will
      *                therefore be transparent to higher layers.
      */
     TCPWorkerBase(const QByteArray &protocol, const QByteArray &poolSocket, const QByteArray &appSocket, bool autoSsl = false);
     ~TCPWorkerBase() override;
 
 protected:
     enum SslResultDetail {
         ResultOk = 1,
         ResultOverridden = 2,
         ResultFailed = 4,
         ResultFailedEarly = 8,
     };
     friend class QFlags<KIO::TCPWorkerBase::SslResultDetail>;
 
 public:
     Q_DECLARE_FLAGS(SslResult, SslResultDetail)
 protected:
     /**
      * Send data to the remote host.
      *
      * @param data data to be sent to remote machine
      * @param len the length (in bytes) of the data to be sent
      *
      * @return the actual size of the data that was sent
      */
     using WorkerBase::write; // Silence incompatible virtual override warning
     ssize_t write(const char *data, ssize_t len);
 
     /**
      * Read incoming data from the remote host.
      *
      * @param data storage for the data read from server
      * @param len length of the data (in bytes) to read from the server
      *
      * @return the actual size of data that was obtained
      */
     using WorkerBase::read;
     ssize_t read(char *data, ssize_t len);
 
     /**
      * Same as read() except it reads data one line at a time.
      */
     ssize_t readLine(char *data, ssize_t len);
 
     /**
      * Performs the initial TCP connection stuff and/or
      * SSL handshaking as necessary.
      *
      * @param protocol the protocol being used
      * @param host hostname
      * @param port port number
      *
      * @return on success, true is returned.
      *         on failure, false is returned and an appropriate
      *         error message is sent to the application.
      */
     KIO::WorkerResult connectToHost(const QString &protocol, const QString &host, quint16 port);
 
     /**
      * Connects to the specified host and port.
      *
      * @param host host name
      * @param port port number
      * @param errorString if not nullptr, this string will contain error information
      *                    on why the connection request failed.
      *
      * @return  on success, 0 is returned. on failure, a KIO::Error code is returned.
      *          @ref errorString, if not nullptr, will contain the appropriate error message
      *          that can be sent back to the client.
      */
     int connectToHost(const QString &host, quint16 port, QString *errorString = nullptr);
 
     /**
      * the current port for this service
      *
      */
     quint16 port() const;
 
     /**
      * Will start SSL after connecting?
      *
      * @return if so, true is returned.
      *         if not, false is returned.
      */
     bool isAutoSsl() const;
 
     /**
      * Is the current connection using SSL?
      *
      * @return if so, true is returned.
      *         if not, false is returned.
      */
     bool isUsingSsl() const;
 
     /**
      * Start using SSL on the connection. You can use it right after connecting
      * for classic, transparent to the protocol SSL. Calling it later can be
      * used to implement e.g. SMTP's STARTTLS feature.
      *
      * @return on success, true is returned.
      *         on failure, false is returned.
      */
     bool startSsl();
 
     /**
      * Close the connection and forget non-permanent data like the peer host.
      */
     void disconnectFromHost();
 
     /**
      * Returns true when end of data is reached.
      */
     bool atEnd() const;
 
     /**
      * Determines whether or not we are still connected
      * to the remote machine.
      *
      * return @p true if the socket is still active or
      *           false otherwise.
      */
     bool isConnected() const;
 
     /**
      * Wait for incoming data on the socket
      * for the period specified by @p t.
      *
      * @param t  length of time in seconds that we should monitor the
      *           socket before timing out.
      *
      * @return true if any data arrived on the socket before the
      *              timeout value was reached, false otherwise.
      */
     bool waitForResponse(int t);
 
     /**
      * Sets the mode of the connection to blocking or non-blocking.
      *
      * Be sure to call this function before calling connectToHost.
      * Otherwise, this setting will not have any effect until the next
      * @p connectToHost.
      *
      * @param b true to make the connection a blocking one, false otherwise.
      */
     void setBlocking(bool b);
 
     /**
      * Returns the socket object, useful if sub-classes need to do anything
      * with it (e.g. connect to any of the signals emitted by @c QAbstractSocket).
      */
     QAbstractSocket *tcpSocket() const;
 
 protected:
     void appConnectionMade() override;
 
 private:
     // For the certificate verification code
     KIOCORE_NO_EXPORT SslResult verifyServerCertificate();
 
     class TCPWorkerBasePrivate;
     std::unique_ptr<TCPWorkerBasePrivate> const d;
     Q_DISABLE_COPY_MOVE(TCPWorkerBase)
 };
 
 } // namespace KIO
 
 #endif