Added broadcasting feature to UDP server sockets.

net/udp/udp_socket_win.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_UDP_UDP_SOCKET_WIN_H_
 #define NET_UDP_UDP_SOCKET_WIN_H_
 
 #include <winsock2.h>
 
 #include "base/memory/ref_counted.h"
@@ skipping 87 matching lines @@
   bool SetReceiveBufferSize(int32 size);
 
   // Set the send buffer size (in bytes) for the socket.
   bool SetSendBufferSize(int32 size);
 
   // Returns true if the socket is already connected or bound.
   bool is_connected() const { return socket_ != INVALID_SOCKET; }
 
   const BoundNetLog& NetLog() const { return net_log_; }
 
+  // Sets corresponding flags in |socket_options_| to allow the socket
+  // to share the local address to which socket will be bound with
+  // other processes. Should be called before Bind().
+  void AllowAddressReuse();
+
+  // Sets corresponding flags in |socket_options_| to allow sending
+  // and receiving packets sent to and from broadcast
+  // addresses. Should be called before Bind().
+  void AllowBroadcast();
+
  private:
+  enum SocketOptions {
+    SOCKET_OPTION_REUSE_ADDRESS = 1 << 0,
+    SOCKET_OPTION_BROADCAST     = 1 << 1
+  };
+
   class ReadDelegate : public base::win::ObjectWatcher::Delegate {
    public:
     explicit ReadDelegate(UDPSocketWin* socket) : socket_(socket) {}
     virtual ~ReadDelegate() {}
 
     // base::ObjectWatcher::Delegate methods:
     virtual void OnObjectSignaled(HANDLE object);
 
    private:
     UDPSocketWin* const socket_;
@@ skipping 30 matching lines @@
   // set to NULL.
   int SendToOrWrite(IOBuffer* buf,
                     int buf_len,
                     const IPEndPoint* address,
                     const CompletionCallback& callback);
 
   int InternalConnect(const IPEndPoint& address);
   int InternalRecvFrom(IOBuffer* buf, int buf_len, IPEndPoint* address);
   int InternalSendTo(IOBuffer* buf, int buf_len, const IPEndPoint* address);
 
+  // Applies |socket_options_| to |socket_|. Should be called before
+  // Bind().
+  int SetSocketOptions();
   int DoBind(const IPEndPoint& address);
   int RandomBind(const IPEndPoint& address);
 
   // Attempts to convert the data in |recv_addr_storage_| and |recv_addr_len_|
   // to an IPEndPoint and writes it to |address|. Returns true on success.
   bool ReceiveAddressToIPEndpoint(IPEndPoint* address) const;
 
   SOCKET socket_;
 
+  // Bitwise-or'd combination of SocketOptions. Specifies set of
+  // options that should be applied to |socket_| before bind.
+  int socket_options_;
+
   // How to do source port binding, used only when UDPSocket is part of
   // UDPClientSocket, since UDPServerSocket provides Bind.
   DatagramSocket::BindType bind_type_;
 
   // PRNG function for generating port numbers.
   RandIntCallback rand_int_cb_;
 
   // These are mutable since they're just cached copies to make
   // GetPeerAddress/GetLocalAddress smarter.
   mutable scoped_ptr<IPEndPoint> local_address_;
@@ skipping 31 matching lines @@
   CompletionCallback write_callback_;
 
   BoundNetLog net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(UDPSocketWin);
 };
 
 }  // namespace net
 
 #endif  // NET_UDP_UDP_SOCKET_WIN_H_