1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef NET_UDP_UDP_SOCKET_WIN_H_
6 #define NET_UDP_UDP_SOCKET_WIN_H_
10 #include "base/memory/ref_counted.h"
11 #include "base/memory/scoped_ptr.h"
12 #include "base/threading/non_thread_safe.h"
13 #include "base/win/object_watcher.h"
14 #include "net/base/completion_callback.h"
15 #include "net/base/net_export.h"
16 #include "net/base/rand_callback.h"
17 #include "net/base/ip_endpoint.h"
18 #include "net/base/io_buffer.h"
19 #include "net/base/net_log.h"
20 #include "net/udp/datagram_socket.h"
24 class NET_EXPORT UDPSocketWin : NON_EXPORTED_BASE(public base::NonThreadSafe) {
26 UDPSocketWin(DatagramSocket::BindType bind_type,
27 const RandIntCallback& rand_int_cb,
29 const net::NetLog::Source& source);
30 virtual ~UDPSocketWin();
32 // Connect the socket to connect with a certain |address|.
33 // Returns a net error code.
34 int Connect(const IPEndPoint& address);
36 // Bind the address/port for this socket to |address|. This is generally
37 // only used on a server.
38 // Returns a net error code.
39 int Bind(const IPEndPoint& address);
44 // Copy the remote udp address into |address| and return a network error code.
45 int GetPeerAddress(IPEndPoint* address) const;
47 // Copy the local udp address into |address| and return a network error code.
48 // (similar to getsockname)
49 int GetLocalAddress(IPEndPoint* address) const;
52 // Multiple outstanding read requests are not supported.
53 // Full duplex mode (reading and writing at the same time) is supported
55 // Read from the socket.
56 // Only usable from the client-side of a UDP socket, after the socket
57 // has been connected.
58 int Read(IOBuffer* buf, int buf_len, const CompletionCallback& callback);
60 // Write to the socket.
61 // Only usable from the client-side of a UDP socket, after the socket
62 // has been connected.
63 int Write(IOBuffer* buf, int buf_len, const CompletionCallback& callback);
65 // Read from a socket and receive sender address information.
66 // |buf| is the buffer to read data into.
67 // |buf_len| is the maximum amount of data to read.
68 // |address| is a buffer provided by the caller for receiving the sender
69 // address information about the received data. This buffer must be kept
70 // alive by the caller until the callback is placed.
71 // |address_length| is a ptr to the length of the |address| buffer. This
72 // is an input parameter containing the maximum size |address| can hold
73 // and also an output parameter for the size of |address| upon completion.
74 // |callback| the callback on completion of the Recv.
75 // Returns a net error code, or ERR_IO_PENDING if the IO is in progress.
76 // If ERR_IO_PENDING is returned, the caller must keep |buf|, |address|,
77 // and |address_length| alive until the callback is called.
78 int RecvFrom(IOBuffer* buf,
81 const CompletionCallback& callback);
83 // Send to a socket with a particular destination.
84 // |buf| is the buffer to send
85 // |buf_len| is the number of bytes to send
86 // |address| is the recipient address.
87 // |address_length| is the size of the recipient address
88 // |callback| is the user callback function to call on complete.
89 // Returns a net error code, or ERR_IO_PENDING if the IO is in progress.
90 // If ERR_IO_PENDING is returned, the caller must keep |buf| and |address|
91 // alive until the callback is called.
92 int SendTo(IOBuffer* buf,
94 const IPEndPoint& address,
95 const CompletionCallback& callback);
97 // Set the receive buffer size (in bytes) for the socket.
98 bool SetReceiveBufferSize(int32 size);
100 // Set the send buffer size (in bytes) for the socket.
101 bool SetSendBufferSize(int32 size);
103 // Returns true if the socket is already connected or bound.
104 bool is_connected() const { return socket_ != INVALID_SOCKET; }
106 const BoundNetLog& NetLog() const { return net_log_; }
108 // Sets corresponding flags in |socket_options_| to allow the socket
109 // to share the local address to which the socket will be bound with
110 // other processes. Should be called before Bind().
111 void AllowAddressReuse();
113 // Sets corresponding flags in |socket_options_| to allow sending
114 // and receiving packets to and from broadcast addresses. Should be
115 // called before Bind().
116 void AllowBroadcast();
118 // Join the multicast group.
119 // |group_address| is the group address to join, could be either
120 // an IPv4 or IPv6 address.
121 // Return a network error code.
122 int JoinGroup(const IPAddressNumber& group_address) const;
124 // Leave the multicast group.
125 // |group_address| is the group address to leave, could be either
126 // an IPv4 or IPv6 address. If the socket hasn't joined the group,
127 // it will be ignored.
128 // It's optional to leave the multicast group before destroying
129 // the socket. It will be done by the OS.
130 // Return a network error code.
131 int LeaveGroup(const IPAddressNumber& group_address) const;
133 // Set the time-to-live option for UDP packets sent to the multicast
134 // group address. The default value of this option is 1.
135 // Cannot be negative or more than 255.
136 // Should be called before Bind().
137 int SetMulticastTimeToLive(int time_to_live);
139 // Set the loopback flag for UDP socket. If this flag is true, the host
140 // will receive packets sent to the joined group from itself.
141 // The default value of this option is true.
142 // Should be called before Bind().
144 // Note: the behavior of |SetMulticastLoopbackMode| is slightly
145 // different between Windows and Unix-like systems. The inconsistency only
146 // happens when there are more than one applications on the same host
147 // joined to the same multicast group while having different settings on
148 // multicast loopback mode. On Windows, the applications with loopback off
149 // will not RECEIVE the loopback packets; while on Unix-like systems, the
150 // applications with loopback off will not SEND the loopback packets to
151 // other applications on the same host. See MSDN: http://goo.gl/6vqbj
152 int SetMulticastLoopbackMode(bool loopback);
154 // Set the differentiated services flags on outgoing packets. May not
155 // do anything on some platforms.
156 int SetDiffServCodePoint(DiffServCodePoint dscp);
160 SOCKET_OPTION_REUSE_ADDRESS = 1 << 0,
161 SOCKET_OPTION_BROADCAST = 1 << 1,
162 SOCKET_OPTION_MULTICAST_LOOP = 1 << 2
167 void DoReadCallback(int rv);
168 void DoWriteCallback(int rv);
169 void DidCompleteRead();
170 void DidCompleteWrite();
172 // Handles stats and logging. |result| is the number of bytes transferred, on
173 // success, or the net error code on failure. LogRead retrieves the address
174 // from |recv_addr_storage_|, while LogWrite takes it as an optional argument.
175 void LogRead(int result, const char* bytes) const;
176 void LogWrite(int result, const char* bytes, const IPEndPoint* address) const;
178 // Returns the OS error code (or 0 on success).
179 int CreateSocket(const IPEndPoint& address);
181 // Same as SendTo(), except that address is passed by pointer
182 // instead of by reference. It is called from Write() with |address|
184 int SendToOrWrite(IOBuffer* buf,
186 const IPEndPoint* address,
187 const CompletionCallback& callback);
189 int InternalConnect(const IPEndPoint& address);
190 int InternalRecvFrom(IOBuffer* buf, int buf_len, IPEndPoint* address);
191 int InternalSendTo(IOBuffer* buf, int buf_len, const IPEndPoint* address);
193 // Applies |socket_options_| to |socket_|. Should be called before
195 int SetSocketOptions();
196 int DoBind(const IPEndPoint& address);
197 int RandomBind(const IPEndPoint& address);
199 // Attempts to convert the data in |recv_addr_storage_| and |recv_addr_len_|
200 // to an IPEndPoint and writes it to |address|. Returns true on success.
201 bool ReceiveAddressToIPEndpoint(IPEndPoint* address) const;
206 // Bitwise-or'd combination of SocketOptions. Specifies the set of
207 // options that should be applied to |socket_| before Bind().
210 // Multicast socket options cached for SetSocketOption.
211 // Cannot be used after Bind().
212 int multicast_time_to_live_;
214 // How to do source port binding, used only when UDPSocket is part of
215 // UDPClientSocket, since UDPServerSocket provides Bind.
216 DatagramSocket::BindType bind_type_;
218 // PRNG function for generating port numbers.
219 RandIntCallback rand_int_cb_;
221 // These are mutable since they're just cached copies to make
222 // GetPeerAddress/GetLocalAddress smarter.
223 mutable scoped_ptr<IPEndPoint> local_address_;
224 mutable scoped_ptr<IPEndPoint> remote_address_;
226 // The core of the socket that can live longer than the socket itself. We pass
227 // resources to the Windows async IO functions and we have to make sure that
228 // they are not destroyed while the OS still references them.
229 scoped_refptr<Core> core_;
231 IPEndPoint* recv_from_address_;
233 // Cached copy of the current address we're sending to, if any. Used for
235 scoped_ptr<IPEndPoint> send_to_address_;
237 // External callback; called when read is complete.
238 CompletionCallback read_callback_;
240 // External callback; called when write is complete.
241 CompletionCallback write_callback_;
243 BoundNetLog net_log_;
245 DISALLOW_COPY_AND_ASSIGN(UDPSocketWin);
250 #endif // NET_UDP_UDP_SOCKET_WIN_H_