net/socket/unix_domain_server_socket_posix.h

// Copyright 2014 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_SOCKET_UNIX_DOMAIN_SERVER_SOCKET_POSIX_H_
#define NET_SOCKET_UNIX_DOMAIN_SERVER_SOCKET_POSIX_H_

#include <sys/types.h>

#include <string>

#include "base/basictypes.h"
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "net/base/net_export.h"
#include "net/socket/server_socket.h"
#include "net/socket/socket_descriptor.h"

namespace net {

class SocketLibevent;

// Unix Domain Server Socket Implementation. Supports abstract namespaces on
// Linux and Android.
class NET_EXPORT UnixDomainServerSocket : public ServerSocket {
 public:
  // Callback that returns whether the already connected client, identified by
  // its process |user_id| and |group_id|, is allowed to keep the connection
  // open. Note that the socket is closed immediately in case the callback
  // returns false.
  typedef base::Callback<bool (uid_t user_id, gid_t group_id)> AuthCallback;

  UnixDomainServerSocket(const AuthCallback& auth_callack,
                         bool use_abstract_namespace);
  virtual ~UnixDomainServerSocket();

  // Gets UID and GID of peer to check permissions.
  static bool GetPeerIds(SocketDescriptor socket_fd,
                         uid_t* user_id,
                         gid_t* group_id);

  // ServerSocket implementation.
  virtual int Listen(const IPEndPoint& address, int backlog) OVERRIDE;
  virtual int ListenWithAddressAndPort(const std::string& unix_domain_path,
                                       int port_unused,
                                       int backlog) OVERRIDE;
  virtual int GetLocalAddress(IPEndPoint* address) const OVERRIDE;
  virtual int Accept(scoped_ptr<StreamSocket>* socket,
                     const CompletionCallback& callback) OVERRIDE;

 private:
  void AcceptCompleted(scoped_ptr<StreamSocket>* socket,
                       const CompletionCallback& callback,
                       int rv);
  bool AuthenticateAndGetStreamSocket(scoped_ptr<StreamSocket>* socket);

  scoped_ptr<SocketLibevent> listen_socket_;
  const AuthCallback auth_callback_;
  const bool use_abstract_namespace_;

  scoped_ptr<SocketLibevent> accept_socket_;

  DISALLOW_COPY_AND_ASSIGN(UnixDomainServerSocket);
};

}  // namespace net

#endif  // NET_SOCKET_UNIX_DOMAIN_SOCKET_POSIX_H_