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* Copyright 2012 The WebRTC Project Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "absl/strings/string_view.h"
#include "absl/types/optional.h"
#include "api/candidate.h"
#include "api/packet_socket_factory.h"
#include "p2p/base/transport_description.h"
#include "rtc_base/async_packet_socket.h"
#include "rtc_base/callback_list.h"
#include "rtc_base/proxy_info.h"
#include "rtc_base/socket_address.h"
namespace rtc {
class Network;
struct PacketOptions;
} // namespace rtc
namespace cricket {
class Connection;
class IceMessage;
class StunMessage;
class StunStats;
enum ProtocolType {
// Defines the interface for a port, which represents a local communication
// mechanism that can be used to create connections to similar mechanisms of
// the other client. Various types of ports will implement this interface.
class PortInterface {
virtual ~PortInterface();
virtual const absl::string_view Type() const = 0;
virtual const rtc::Network* Network() const = 0;
// Methods to set/get ICE role and tiebreaker values.
virtual void SetIceRole(IceRole role) = 0;
virtual IceRole GetIceRole() const = 0;
virtual void SetIceTiebreaker(uint64_t tiebreaker) = 0;
virtual uint64_t IceTiebreaker() const = 0;
virtual bool SharedSocket() const = 0;
virtual bool SupportsProtocol(absl::string_view protocol) const = 0;
// PrepareAddress will attempt to get an address for this port that other
// clients can send to. It may take some time before the address is ready.
// Once it is ready, we will send SignalAddressReady. If errors are
// preventing the port from getting an address, it may send
// SignalAddressError.
virtual void PrepareAddress() = 0;
// Returns the connection to the given address or NULL if none exists.
virtual Connection* GetConnection(const rtc::SocketAddress& remote_addr) = 0;
// Creates a new connection to the given address.
virtual Connection* CreateConnection(const Candidate& remote_candidate,
CandidateOrigin origin) = 0;
// Functions on the underlying socket(s).
virtual int SetOption(rtc::Socket::Option opt, int value) = 0;
virtual int GetOption(rtc::Socket::Option opt, int* value) = 0;
virtual int GetError() = 0;
virtual ProtocolType GetProtocol() const = 0;
virtual const std::vector<Candidate>& Candidates() const = 0;
// Sends the given packet to the given address, provided that the address is
// that of a connection or an address that has sent to us already.
virtual int SendTo(const void* data,
size_t size,
const rtc::SocketAddress& addr,
const rtc::PacketOptions& options,
bool payload) = 0;
// Indicates that we received a successful STUN binding request from an
// address that doesn't correspond to any current connection. To turn this
// into a real connection, call CreateConnection.
const rtc::SocketAddress&,
const std::string&,
// Sends a response message (normal or error) to the given request. One of
// these methods should be called as a response to SignalUnknownAddress.
virtual void SendBindingErrorResponse(StunMessage* message,
const rtc::SocketAddress& addr,
int error_code,
absl::string_view reason) = 0;
// Signaled when this port decides to delete itself because it no longer has
// any usefulness.
virtual void SubscribePortDestroyed(
std::function<void(PortInterface*)> callback) = 0;
// Signaled when Port discovers ice role conflict with the peer.
sigslot::signal1<PortInterface*> SignalRoleConflict;
// Normally, packets arrive through a connection (or they result signaling of
// unknown address). Calling this method turns off delivery of packets
// through their respective connection and instead delivers every packet
// through this port.
virtual void EnablePortPackets() = 0;
signal4<PortInterface*, const char*, size_t, const rtc::SocketAddress&>
// Emitted each time a packet is sent on this port.
sigslot::signal1<const rtc::SentPacket&> SignalSentPacket;
virtual std::string ToString() const = 0;
virtual void GetStunStats(absl::optional<StunStats>* stats) = 0;
// Removes and deletes a connection object. `DestroyConnection` will
// delete the connection object directly whereas `DestroyConnectionAsync`
// defers the `delete` operation to when the call stack has been unwound.
// Async may be needed when deleting a connection object from within a
// callback.
virtual void DestroyConnection(Connection* conn) = 0;
virtual void DestroyConnectionAsync(Connection* conn) = 0;
// The thread on which this port performs its I/O.
virtual webrtc::TaskQueueBase* thread() = 0;
// The factory used to create the sockets of this port.
virtual rtc::PacketSocketFactory* socket_factory() const = 0;
virtual const std::string& user_agent() = 0;
virtual const rtc::ProxyInfo& proxy() = 0;
// Identifies the generation that this port was created in.
virtual uint32_t generation() const = 0;
virtual void set_generation(uint32_t generation) = 0;
virtual bool send_retransmit_count_attribute() const = 0;
// For debugging purposes.
virtual const std::string& content_name() const = 0;
// Called when the Connection discovers a local peer reflexive candidate.
virtual void AddPrflxCandidate(const Candidate& local) = 0;
virtual void UpdateNetworkCost() = 0;
// Returns DSCP value packets generated by the port itself should use.
virtual rtc::DiffServCodePoint StunDscpValue() const = 0;
// If the given data comprises a complete and correct STUN message then the
// return value is true, otherwise false. If the message username corresponds
// with this port's username fragment, msg will contain the parsed STUN
// message. Otherwise, the function may send a STUN response internally.
// remote_username contains the remote fragment of the STUN username.
virtual bool GetStunMessage(const char* data,
size_t size,
const rtc::SocketAddress& addr,
std::unique_ptr<IceMessage>* out_msg,
std::string* out_username) = 0;
// This method will return local and remote username fragements from the
// stun username attribute if present.
virtual bool ParseStunUsername(const StunMessage* stun_msg,
std::string* local_username,
std::string* remote_username) const = 0;
virtual std::string CreateStunUsername(
absl::string_view remote_username) const = 0;
virtual bool MaybeIceRoleConflict(const rtc::SocketAddress& addr,
IceMessage* stun_msg,
absl::string_view remote_ufrag) = 0;
virtual int16_t network_cost() const = 0;
// Connection and Port are entangled; functions exposed to Port only
// should not be public.
friend class Connection;
} // namespace cricket