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/usr/include/eiskaltdcpp/dcpp/SSLSocket.h is in libeiskaltdcpp-dev 2.2.9-3.

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/*
 * Copyright (C) 2001-2012 Jacek Sieka, arnetheduck on gmail point com
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#pragma once

#include "Socket.h"
#include "Singleton.h"
#include "SSL.h"

#ifndef SSL_SUCCESS
#define SSL_SUCCESS 1
#endif

namespace dcpp {

class SSLSocketException : public SocketException {
public:
#ifdef _DEBUG
    SSLSocketException(const string& aError) noexcept : SocketException("SSLSocketException: " + aError) { }
#else //_DEBUG
    SSLSocketException(const string& aError) noexcept : SocketException(aError) { }
#endif // _DEBUG

    virtual ~SSLSocketException() throw() { }
};

class CryptoManager;

class SSLSocket : public Socket {
public:
    virtual ~SSLSocket() { }

    virtual void accept(const Socket& listeningSocket);
    virtual void connect(const string& aIp, uint16_t aPort);
    virtual int read(void* aBuffer, int aBufLen);
    virtual int write(const void* aBuffer, int aLen);
    virtual int wait(uint32_t millis, int waitFor);
    virtual void shutdown() noexcept;
    virtual void close() noexcept;

    virtual bool isSecure() const noexcept { return true; }
    virtual bool isTrusted() const noexcept;
    virtual std::string getCipherName() const noexcept;
    virtual vector<uint8_t> getKeyprint() const noexcept;

    virtual bool waitConnected(uint32_t millis);
    virtual bool waitAccepted(uint32_t millis);


private:
    friend class CryptoManager;

    SSLSocket(SSL_CTX* context);
    SSLSocket(const SSLSocket&);
    SSLSocket& operator=(const SSLSocket&);

    SSL_CTX* ctx;
    ssl::SSL ssl;

    int checkSSL(int ret);
    bool waitWant(int ret, uint32_t millis);
};

} // namespace dcpp