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// 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 <stdint.h>
#include <sys/types.h>
#include <memory>
#include <string>
#include "base/callback.h"
#include "base/macros.h"
#include "net/base/net_export.h"
#include "net/socket/server_socket.h"
#include "net/socket/socket_descriptor.h"
namespace net {
class SocketPosix;
// Unix Domain Server Socket Implementation. Supports abstract namespaces on
// Linux and Android.
class NET_EXPORT UnixDomainServerSocket : public ServerSocket {
public:
// Credentials of a peer process connected to the socket.
struct NET_EXPORT Credentials {
#if defined(OS_LINUX) || defined(OS_ANDROID)
// Linux/Android API provides more information about the connected peer
// than Windows/OS X. It's useful for permission-based authorization on
// Android.
pid_t process_id;
#endif
uid_t user_id;
gid_t group_id;
};
// Callback that returns whether the already connected client, identified by
// its credentials, is allowed to keep the connection open. Note that
// the socket is closed immediately in case the callback returns false.
typedef base::Callback<bool (const Credentials&)> AuthCallback;
UnixDomainServerSocket(const AuthCallback& auth_callack,
bool use_abstract_namespace);
~UnixDomainServerSocket() override;
// Gets credentials of peer to check permissions.
static bool GetPeerCredentials(SocketDescriptor socket_fd,
Credentials* credentials);
// ServerSocket implementation.
int Listen(const IPEndPoint& address, int backlog) override;
int ListenWithAddressAndPort(const std::string& address_string,
uint16_t port,
int backlog) override;
int GetLocalAddress(IPEndPoint* address) const override;
int Accept(std::unique_ptr<StreamSocket>* socket,
const CompletionCallback& callback) override;
// Creates a server socket, binds it to the specified |socket_path| and
// starts listening for incoming connections with the specified |backlog|.
int BindAndListen(const std::string& socket_path, int backlog);
// Accepts an incoming connection on |listen_socket_|, but passes back
// a raw SocketDescriptor instead of a StreamSocket.
int AcceptSocketDescriptor(SocketDescriptor* socket_descriptor,
const CompletionCallback& callback);
private:
// A callback to wrap the setting of the out-parameter to Accept().
// This allows the internal machinery of that call to be implemented in
// a manner that's agnostic to the caller's desired output.
typedef base::Callback<void(std::unique_ptr<SocketPosix>)> SetterCallback;
int DoAccept(const SetterCallback& setter_callback,
const CompletionCallback& callback);
void AcceptCompleted(const SetterCallback& setter_callback,
const CompletionCallback& callback,
int rv);
bool AuthenticateAndGetStreamSocket(const SetterCallback& setter_callback);
std::unique_ptr<SocketPosix> listen_socket_;
const AuthCallback auth_callback_;
const bool use_abstract_namespace_;
std::unique_ptr<SocketPosix> accept_socket_;
DISALLOW_COPY_AND_ASSIGN(UnixDomainServerSocket);
};
} // namespace net
#endif // NET_SOCKET_UNIX_DOMAIN_SERVER_SOCKET_POSIX_H_
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