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/.
 * 
 */

/*****************************************************************************
Copyright (c) 2001 - 2011, The Board of Trustees of the University of Illinois.
All rights reserved.

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modification, are permitted provided that the following conditions are
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
  software without specific prior written permission.

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/*****************************************************************************
written by
   Yunhong Gu, last updated 01/27/2011
modified by
   Haivision Systems Inc.
*****************************************************************************/

#ifndef __UDT_CHANNEL_H__
#define __UDT_CHANNEL_H__


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

class CChannel
{
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(int version);
   ~CChannel();

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

   void open(const sockaddr* addr = NULL);

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

   void attach(UDPSOCKET udpsock);

      /// 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();

      /// Set the UDP sending buffer size.
      /// @param [in] size expected UDP sending buffer size.

   void setSndBufSize(int size);

      /// Set the UDP receiving buffer size.
      /// @param [in] size expected UDP receiving buffer size.

   void setRcvBufSize(int size);

      /// Set the IPV6ONLY option.
      /// @param [in] IPV6ONLY value.

   void setIpV6Only(int ipV6Only);

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

   void getSockAddr(sockaddr* 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* 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* addr, 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* addr, CPacket& packet) const;

#ifdef SRT_ENABLE_IPOPTS
      /// Set the IP TTL.
      /// @param [in] ttl IP Time To Live.
      /// @return none.

   void setIpTTL(int ttl);

      /// Set the IP Type of Service.
      /// @param [in] tos IP Type of Service.

   void setIpToS(int tos);

      /// 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;
#endif

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

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

private:
   void setUDPSockOpt();

private:
   const int m_iIPversion;              // IP version
   int m_iSockAddrSize;                 // socket address structure size (pre-defined to avoid run-time test)

   UDPSOCKET m_iSocket;                 // socket descriptor
#ifdef SRT_ENABLE_IPOPTS
   int m_iIpTTL;
   int m_iIpToS;
#endif
   int m_iSndBufSize;                   // UDP sending buffer size
   int m_iRcvBufSize;                   // UDP receiving buffer size
   int m_iIpV6Only;                     // IPV6_V6ONLY option (-1 if not set)
   sockaddr_any m_BindAddr;
};


#endif