net/socket/udp_client_socket.h

// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef NET_SOCKET_UDP_CLIENT_SOCKET_H_
#define NET_SOCKET_UDP_CLIENT_SOCKET_H_

#include <stdint.h>

#include "net/base/net_export.h"
#include "net/socket/datagram_client_socket.h"
#include "net/socket/socket_descriptor.h"
#include "net/socket/udp_socket.h"
#include "net/traffic_annotation/network_traffic_annotation.h"

namespace net {

class NetLog;
struct NetLogSource;

// A client socket that uses UDP as the transport layer.
class NET_EXPORT_PRIVATE UDPClientSocket : public DatagramClientSocket {
 public:
  // If `network` is specified, the socket will be bound to it. All data traffic
  // on the socket will be sent and received via `network`. Communication using
  // this socket will fail if `network` disconnects.
  UDPClientSocket(
      DatagramSocket::BindType bind_type,
      net::NetLog* net_log,
      const net::NetLogSource& source,
      handles::NetworkHandle network = handles::kInvalidNetworkHandle);

  UDPClientSocket(const UDPClientSocket&) = delete;
  UDPClientSocket& operator=(const UDPClientSocket&) = delete;

  ~UDPClientSocket() override;

  // DatagramClientSocket implementation.
  int Connect(const IPEndPoint& address) override;
  int ConnectUsingNetwork(handles::NetworkHandle network,
                          const IPEndPoint& address) override;
  int ConnectUsingDefaultNetwork(const IPEndPoint& address) override;
  int ConnectAsync(const IPEndPoint& address,
                   CompletionOnceCallback callback) override;
  int ConnectUsingNetworkAsync(handles::NetworkHandle network,
                               const IPEndPoint& address,
                               CompletionOnceCallback callback) override;
  int ConnectUsingDefaultNetworkAsync(const IPEndPoint& address,
                                      CompletionOnceCallback callback) override;

  handles::NetworkHandle GetBoundNetwork() const override;
  void ApplySocketTag(const SocketTag& tag) override;
  int Read(IOBuffer* buf,
           int buf_len,
           CompletionOnceCallback callback) override;
  int Write(IOBuffer* buf,
            int buf_len,
            CompletionOnceCallback callback,
            const NetworkTrafficAnnotationTag& traffic_annotation) override;

  void Close() override;
  int GetPeerAddress(IPEndPoint* address) const override;
  int GetLocalAddress(IPEndPoint* address) const override;
  // Switch to use non-blocking IO. Must be called right after construction and
  // before other calls.
  void UseNonBlockingIO() override;
  int SetReceiveBufferSize(int32_t size) override;
  int SetSendBufferSize(int32_t size) override;
  int SetDoNotFragment() override;
  void SetMsgConfirm(bool confirm) override;
  const NetLogWithSource& NetLog() const override;
  void EnableRecvOptimization() override;

  int SetMulticastInterface(uint32_t interface_index) override;
  void SetIOSNetworkServiceType(int ios_network_service_type) override;

  // Takes ownership of an opened but unconnected and unbound `socket`.
  void AdoptOpenedSocket(AddressFamily address_family, SocketDescriptor socket);

 private:
  UDPSocket socket_;
  bool connect_called_ = false;
  // The network the socket is currently bound to.
  handles::NetworkHandle network_;
  handles::NetworkHandle connect_using_network_;
};

}  // namespace net

#endif  // NET_SOCKET_UDP_CLIENT_SOCKET_H_