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/*
* libjingle
* Copyright 2004--2005, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef TALK_BASE_ASYNCPACKETSOCKET_H_
#define TALK_BASE_ASYNCPACKETSOCKET_H_
#include "talk/base/dscp.h"
#include "talk/base/sigslot.h"
#include "talk/base/socket.h"
#include "talk/base/timeutils.h"
namespace talk_base {
// This structure holds the info needed to update the packet send time header
// extension, including the information needed to update the authentication tag
// after changing the value.
struct PacketTimeUpdateParams {
PacketTimeUpdateParams()
: rtp_sendtime_extension_id(-1), srtp_auth_tag_len(-1),
srtp_packet_index(-1) {
}
int rtp_sendtime_extension_id; // extension header id present in packet.
std::vector<char> srtp_auth_key; // Authentication key.
int srtp_auth_tag_len; // Authentication tag length.
int64 srtp_packet_index; // Required for Rtp Packet authentication.
};
// This structure holds meta information for the packet which is about to send
// over network.
struct PacketOptions {
PacketOptions() : dscp(DSCP_NO_CHANGE) {}
explicit PacketOptions(DiffServCodePoint dscp) : dscp(dscp) {}
DiffServCodePoint dscp;
PacketTimeUpdateParams packet_time_params;
};
// This structure will have the information about when packet is actually
// received by socket.
struct PacketTime {
PacketTime() : timestamp(-1), not_before(-1) {}
PacketTime(int64 timestamp, int64 not_before)
: timestamp(timestamp), not_before(not_before) {
}
int64 timestamp; // Receive time after socket delivers the data.
int64 not_before; // Earliest possible time the data could have arrived,
// indicating the potential error in the |timestamp| value,
// in case the system, is busy. For example, the time of
// the last select() call.
// If unknown, this value will be set to zero.
};
inline PacketTime CreatePacketTime(int64 not_before) {
return PacketTime(TimeMicros(), not_before);
}
// Provides the ability to receive packets asynchronously. Sends are not
// buffered since it is acceptable to drop packets under high load.
class AsyncPacketSocket : public sigslot::has_slots<> {
public:
enum State {
STATE_CLOSED,
STATE_BINDING,
STATE_BOUND,
STATE_CONNECTING,
STATE_CONNECTED
};
AsyncPacketSocket() { }
virtual ~AsyncPacketSocket() { }
// Returns current local address. Address may be set to NULL if the
// socket is not bound yet (GetState() returns STATE_BINDING).
virtual SocketAddress GetLocalAddress() const = 0;
// Returns remote address. Returns zeroes if this is not a client TCP socket.
virtual SocketAddress GetRemoteAddress() const = 0;
// Send a packet.
virtual int Send(const void *pv, size_t cb, const PacketOptions& options) = 0;
virtual int SendTo(const void *pv, size_t cb, const SocketAddress& addr,
const PacketOptions& options) = 0;
// Close the socket.
virtual int Close() = 0;
// Returns current state of the socket.
virtual State GetState() const = 0;
// Get/set options.
virtual int GetOption(Socket::Option opt, int* value) = 0;
virtual int SetOption(Socket::Option opt, int value) = 0;
// Get/Set current error.
// TODO: Remove SetError().
virtual int GetError() const = 0;
virtual void SetError(int error) = 0;
// Emitted each time a packet is read. Used only for UDP and
// connected TCP sockets.
sigslot::signal5<AsyncPacketSocket*, const char*, size_t,
const SocketAddress&,
const PacketTime&> SignalReadPacket;
// Emitted when the socket is currently able to send.
sigslot::signal1<AsyncPacketSocket*> SignalReadyToSend;
// Emitted after address for the socket is allocated, i.e. binding
// is finished. State of the socket is changed from BINDING to BOUND
// (for UDP and server TCP sockets) or CONNECTING (for client TCP
// sockets).
sigslot::signal2<AsyncPacketSocket*, const SocketAddress&> SignalAddressReady;
// Emitted for client TCP sockets when state is changed from
// CONNECTING to CONNECTED.
sigslot::signal1<AsyncPacketSocket*> SignalConnect;
// Emitted for client TCP sockets when state is changed from
// CONNECTED to CLOSED.
sigslot::signal2<AsyncPacketSocket*, int> SignalClose;
// Used only for listening TCP sockets.
sigslot::signal2<AsyncPacketSocket*, AsyncPacketSocket*> SignalNewConnection;
private:
DISALLOW_EVIL_CONSTRUCTORS(AsyncPacketSocket);
};
} // namespace talk_base
#endif // TALK_BASE_ASYNCPACKETSOCKET_H_
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