srs/trunk/3rdparty/srt-1-fit/srtcore/channel.h

/*
 * SRT - Secure, Reliable, Transport
 * Copyright (c) 2018 Haivision Systems Inc.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 */

/*****************************************************************************
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met:

* Redistributions of source code must retain the above
  copyright notice, this list of conditions and the
  following disclaimer.

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  above copyright notice, this list of conditions
  and the following disclaimer in the documentation
  and/or other materials provided with the distribution.

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  nor the names of its contributors may be used to
  endorse or promote products derived from this
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/*****************************************************************************
written by
   Yunhong Gu, last updated 01/27/2011
modified by
   Haivision Systems Inc.
*****************************************************************************/

#ifndef INC_SRT_CHANNEL_H
#define INC_SRT_CHANNEL_H

#include "platform_sys.h"
#include "udt.h"
#include "packet.h"
#include "socketconfig.h"
#include "netinet_any.h"

namespace srt
{

class CChannel
{
    void createSocket(int family);

public:
    // XXX There's currently no way to access the socket ID set for
    // whatever the channel is currently working for. Required to find
    // some way to do this, possibly by having a "reverse pointer".
    // Currently just "unimplemented".
    std::string CONID() const { return ""; }

    CChannel();
    ~CChannel();

    /// Open a UDP channel.
    /// @param [in] addr The local address that UDP will use.

    void open(const sockaddr_any& addr);

    void open(int family);

    /// Open a UDP channel based on an existing UDP socket.
    /// @param [in] udpsock UDP socket descriptor.

    void attach(UDPSOCKET udpsock, const sockaddr_any& adr);

    /// Disconnect and close the UDP entity.

    void close() const;

    /// Get the UDP sending buffer size.
    /// @return Current UDP sending buffer size.

    int getSndBufSize();

    /// Get the UDP receiving buffer size.
    /// @return Current UDP receiving buffer size.

    int getRcvBufSize();

    /// Query the socket address that the channel is using.
    /// @param [out] addr pointer to store the returned socket address.

    void getSockAddr(sockaddr_any& addr) const;

    /// Query the peer side socket address that the channel is connect to.
    /// @param [out] addr pointer to store the returned socket address.

    void getPeerAddr(sockaddr_any& addr) const;

    /// Send a packet to the given address.
    /// @param [in] addr pointer to the destination address.
    /// @param [in] packet reference to a CPacket entity.
    /// @return Actual size of data sent.

    int sendto(const sockaddr_any& addr, srt::CPacket& packet) const;

    /// Receive a packet from the channel and record the source address.
    /// @param [in] addr pointer to the source address.
    /// @param [in] packet reference to a CPacket entity.
    /// @return Actual size of data received.

    EReadStatus recvfrom(sockaddr_any& addr, srt::CPacket& packet) const;

    void setConfig(const CSrtMuxerConfig& config);

    /// Get the IP TTL.
    /// @param [in] ttl IP Time To Live.
    /// @return TTL.

    int getIpTTL() const;

    /// Get the IP Type of Service.
    /// @return ToS.

    int getIpToS() const;

#ifdef SRT_ENABLE_BINDTODEVICE
    bool getBind(char* dst, size_t len);
#endif

    int ioctlQuery(int type) const;
    int sockoptQuery(int level, int option) const;

    const sockaddr*     bindAddress() { return m_BindAddr.get(); }
    const sockaddr_any& bindAddressAny() { return m_BindAddr; }

private:
    void setUDPSockOpt();

private:
    UDPSOCKET m_iSocket; // socket descriptor

    // Mutable because when querying original settings
    // this comprises the cache for extracted values,
    // although the object itself isn't considered modified.
    mutable CSrtMuxerConfig m_mcfg; // Note: ReuseAddr is unused and ineffective.
    sockaddr_any            m_BindAddr;
};

} // namespace srt

#endif