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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.
#include <stdint.h>
#include <sys/types.h>
#include <memory>
#include <string>
#include "base/callback.h"
#include "base/macros.h"
#include "build/build_config.h"
#include "net/base/completion_once_callback.h"
#include "net/base/net_export.h"
#include "net/socket/server_socket.h"
#include "net/socket/socket_descriptor.h"
namespace net {
class SocketPosix;
// A server socket that uses unix domain socket as the transport layer.
// Supports abstract namespaces on Linux and Android.
class NET_EXPORT UnixDomainServerSocket : public ServerSocket {
// Credentials of a peer process connected to the socket.
struct NET_EXPORT Credentials {
#if defined(OS_LINUX) || defined(OS_ANDROID) || defined(OS_FUCHSIA)
// Linux and Fuchsia provide more information about the connected peer
// than Windows/OS X. It's useful for permission-based authorization on
// Android.
pid_t process_id;
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,
CompletionOnceCallback 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,
CompletionOnceCallback callback);
// 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);
void AcceptCompleted(const SetterCallback& setter_callback,
int rv);
bool AuthenticateAndGetStreamSocket(const SetterCallback& setter_callback);
std::unique_ptr<SocketPosix> listen_socket_;
const AuthCallback auth_callback_;
CompletionOnceCallback callback_;
const bool use_abstract_namespace_;
std::unique_ptr<SocketPosix> accept_socket_;
} // namespace net